blob: c838b85342f3de962bad7b7a2fcfa8819487d33e [file] [log] [blame]
Damien Miller57c30112006-03-26 14:24:48 +11001/* $OpenBSD: channels.c,v 1.244 2006/03/25 13:17:01 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * This file contains functions for generic socket connection forwarding.
7 * There is also code for initiating connection forwarding for X11 connections,
8 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10009 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
Damien Miller33b13562000-04-04 14:38:59 +100016 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110017 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 * Copyright (c) 1999 Dug Song. All rights reserved.
19 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110040 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110043
44#include <sys/ioctl.h>
Damien Miller574c41f2006-03-15 11:40:10 +110045#include <sys/types.h>
46#include <sys/un.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110047
48#include <termios.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100049
50#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000051#include "ssh1.h"
52#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100053#include "packet.h"
54#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000055#include "log.h"
56#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100057#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100058#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000059#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100060#include "key.h"
61#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110062#include "pathnames.h"
Darren Tucker46471c92003-07-03 13:55:19 +100063#include "bufaux.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064
Ben Lindstrome9c99912001-06-09 00:41:05 +000065/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100066
Damien Miller5428f641999-11-25 11:54:57 +110067/*
68 * Pointer to an array containing all allocated channels. The array is
69 * dynamically extended as needed.
70 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000071static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100072
Damien Miller5428f641999-11-25 11:54:57 +110073/*
74 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000075 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110076 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100077static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100078
Damien Miller5428f641999-11-25 11:54:57 +110079/*
80 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000081 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110082 */
Damien Miller5e953212001-01-30 09:14:00 +110083static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100084
Damien Millerd4a8b7e1999-10-27 13:42:43 +100085
Ben Lindstrome9c99912001-06-09 00:41:05 +000086/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100087
Damien Miller5428f641999-11-25 11:54:57 +110088/*
89 * Data structure for storing which hosts are permitted for forward requests.
90 * The local sides of any remote forwards are stored in this array to prevent
91 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
92 * network (which might be behind a firewall).
93 */
Damien Miller95def091999-11-25 00:26:21 +110094typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +100095 char *host_to_connect; /* Connect to 'host'. */
96 u_short port_to_connect; /* Connect to 'port'. */
97 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100098} ForwardPermission;
99
100/* List of all permitted host/port pairs to connect. */
101static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +0000102
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000103/* Number of permitted host/port pairs in the array. */
104static int num_permitted_opens = 0;
Damien Miller5428f641999-11-25 11:54:57 +1100105/*
106 * If this is true, all opens are permitted. This is the case on the server
107 * on which we have to trust the client anyway, and the user could do
108 * anything after logging in anyway.
109 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000110static int all_opens_permitted = 0;
111
Ben Lindstrome9c99912001-06-09 00:41:05 +0000112
113/* -- X11 forwarding */
114
115/* Maximum number of fake X11 displays to try. */
116#define MAX_DISPLAYS 1000
117
Damien Miller13390022005-07-06 09:44:19 +1000118/* Saved X11 local (client) display. */
119static char *x11_saved_display = NULL;
120
Ben Lindstrome9c99912001-06-09 00:41:05 +0000121/* Saved X11 authentication protocol name. */
122static char *x11_saved_proto = NULL;
123
124/* Saved X11 authentication data. This is the real data. */
125static char *x11_saved_data = NULL;
126static u_int x11_saved_data_len = 0;
127
128/*
129 * Fake X11 authentication data. This is what the server will be sending us;
130 * we should replace any occurrences of this by the real data.
131 */
Damien Miller4ae97f12006-03-26 14:08:10 +1100132static u_char *x11_fake_data = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000133static u_int x11_fake_data_len;
134
135
136/* -- agent forwarding */
137
138#define NUM_SOCKS 10
139
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000140/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000141static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000142
Ben Lindstrome9c99912001-06-09 00:41:05 +0000143/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000144static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000145
Ben Lindstrome9c99912001-06-09 00:41:05 +0000146/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000147
148Channel *
Damien Millerd47c62a2005-12-13 19:33:57 +1100149channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000150{
151 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000152
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000153 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100154 logit("channel_by_id: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000155 return NULL;
156 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000157 c = channels[id];
158 if (c == NULL) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100159 logit("channel_by_id: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000160 return NULL;
161 }
162 return c;
163}
164
Damien Miller5428f641999-11-25 11:54:57 +1100165/*
Damien Millerd47c62a2005-12-13 19:33:57 +1100166 * Returns the channel if it is allowed to receive protocol messages.
167 * Private channels, like listening sockets, may not receive messages.
168 */
169Channel *
170channel_lookup(int id)
171{
172 Channel *c;
173
174 if ((c = channel_by_id(id)) == NULL)
175 return (NULL);
176
Damien Millerd62f2ca2006-03-26 13:57:41 +1100177 switch (c->type) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100178 case SSH_CHANNEL_X11_OPEN:
179 case SSH_CHANNEL_LARVAL:
180 case SSH_CHANNEL_CONNECTING:
181 case SSH_CHANNEL_DYNAMIC:
182 case SSH_CHANNEL_OPENING:
183 case SSH_CHANNEL_OPEN:
184 case SSH_CHANNEL_INPUT_DRAINING:
185 case SSH_CHANNEL_OUTPUT_DRAINING:
186 return (c);
Damien Millerd47c62a2005-12-13 19:33:57 +1100187 }
188 logit("Non-public channel %d, type %d.", id, c->type);
189 return (NULL);
190}
191
192/*
Damien Millere247cc42000-05-07 12:03:14 +1000193 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000194 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100195 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000196static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100197channel_register_fds(Channel *c, int rfd, int wfd, int efd,
198 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199{
Damien Miller95def091999-11-25 00:26:21 +1100200 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100201 channel_max_fd = MAX(channel_max_fd, rfd);
202 channel_max_fd = MAX(channel_max_fd, wfd);
203 channel_max_fd = MAX(channel_max_fd, efd);
204
Damien Miller5428f641999-11-25 11:54:57 +1100205 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000206
Damien Miller6f83b8e2000-05-02 09:23:45 +1000207 c->rfd = rfd;
208 c->wfd = wfd;
209 c->sock = (rfd == wfd) ? rfd : -1;
Damien Miller0e220db2004-06-15 10:34:08 +1000210 c->ctl_fd = -1; /* XXX: set elsewhere */
Damien Miller6f83b8e2000-05-02 09:23:45 +1000211 c->efd = efd;
212 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100213
Damien Miller79438cc2001-02-16 12:34:57 +1100214 /* XXX ugly hack: nonblock is only set by the server */
215 if (nonblock && isatty(c->rfd)) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000216 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100217 c->isatty = 1;
218 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000219 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100220 c->self, c->wfd);
221 }
222 } else {
223 c->isatty = 0;
224 }
Ben Lindstrombeb5f332002-07-22 15:28:53 +0000225 c->wfd_isatty = isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100226
Damien Miller69b69aa2000-10-28 14:19:58 +1100227 /* enable nonblocking mode */
228 if (nonblock) {
229 if (rfd != -1)
230 set_nonblock(rfd);
231 if (wfd != -1)
232 set_nonblock(wfd);
233 if (efd != -1)
234 set_nonblock(efd);
235 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000236}
237
238/*
239 * Allocate a new channel object and set its type and socket. This will cause
240 * remote_name to be freed.
241 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000242Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000243channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000244 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000245{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000246 int found;
247 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000248 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000249
Damien Miller95def091999-11-25 00:26:21 +1100250 /* Do initial allocation if this is the first call. */
251 if (channels_alloc == 0) {
252 channels_alloc = 10;
Damien Miller07d86be2006-03-26 14:19:21 +1100253 channels = xcalloc(channels_alloc, sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100254 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000255 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100256 }
257 /* Try to find a free slot where to put the new channel. */
258 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000259 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100260 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000261 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100262 break;
263 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000264 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100265 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100266 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000267 if (channels_alloc > 10000)
268 fatal("channel_new: internal error: channels_alloc %d "
269 "too big.", channels_alloc);
Damien Miller36812092006-03-26 14:22:47 +1100270 channels = xrealloc(channels, channels_alloc + 10,
271 sizeof(Channel *));
Damien Miller5efcecc2003-09-17 07:31:14 +1000272 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100273 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100274 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000275 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100276 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000277 /* Initialize and return new channel. */
Damien Miller07d86be2006-03-26 14:19:21 +1100278 c = channels[found] = xcalloc(1, 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 Miller077b2382005-12-31 16:22:32 +1100304 c->output_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100305 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000306 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000307}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000308
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000309static int
310channel_find_maxfd(void)
311{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000312 u_int i;
313 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000314 Channel *c;
315
316 for (i = 0; i < channels_alloc; i++) {
317 c = channels[i];
318 if (c != NULL) {
319 max = MAX(max, c->rfd);
320 max = MAX(max, c->wfd);
321 max = MAX(max, c->efd);
322 }
323 }
324 return max;
325}
326
327int
328channel_close_fd(int *fdp)
329{
330 int ret = 0, fd = *fdp;
331
332 if (fd != -1) {
333 ret = close(fd);
334 *fdp = -1;
335 if (fd == channel_max_fd)
336 channel_max_fd = channel_find_maxfd();
337 }
338 return ret;
339}
340
Damien Miller6f83b8e2000-05-02 09:23:45 +1000341/* Close all channel fd/socket. */
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 Miller4af51302000-04-16 11:18:38 +1000356void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000357channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000358{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000359 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000360 u_int i, n;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000361
362 for (n = 0, i = 0; i < channels_alloc; i++)
363 if (channels[i])
364 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000365 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000366 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000367
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000368 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000369 debug3("channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000370 xfree(s);
371
Damien Miller6f83b8e2000-05-02 09:23:45 +1000372 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000373 shutdown(c->sock, SHUT_RDWR);
Damien Miller0e220db2004-06-15 10:34:08 +1000374 if (c->ctl_fd != -1)
375 shutdown(c->ctl_fd, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000376 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000377 buffer_free(&c->input);
378 buffer_free(&c->output);
379 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000380 if (c->remote_name) {
381 xfree(c->remote_name);
382 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100383 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000384 channels[c->self] = NULL;
385 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000386}
387
Ben Lindstrome9c99912001-06-09 00:41:05 +0000388void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000389channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000390{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000391 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000392
Ben Lindstrom601e4362001-06-21 03:19:23 +0000393 for (i = 0; i < channels_alloc; i++)
394 if (channels[i] != NULL)
395 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000396}
397
398/*
399 * Closes the sockets/fds of all channels. This is used to close extra file
400 * descriptors after a fork.
401 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000402void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000403channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000404{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000405 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000406
407 for (i = 0; i < channels_alloc; i++)
408 if (channels[i] != NULL)
409 channel_close_fds(channels[i]);
410}
411
412/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000413 * Stop listening to channels.
414 */
Ben Lindstrom809744e2001-07-04 05:26:06 +0000415void
416channel_stop_listening(void)
417{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000418 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000419 Channel *c;
420
421 for (i = 0; i < channels_alloc; i++) {
422 c = channels[i];
423 if (c != NULL) {
424 switch (c->type) {
425 case SSH_CHANNEL_AUTH_SOCKET:
426 case SSH_CHANNEL_PORT_LISTENER:
427 case SSH_CHANNEL_RPORT_LISTENER:
428 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000429 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000430 channel_free(c);
431 break;
432 }
433 }
434 }
435}
436
437/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000438 * Returns true if no channel has too much buffered data, and false if one or
439 * more channel is overfull.
440 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000441int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000442channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000443{
444 u_int i;
445 Channel *c;
446
447 for (i = 0; i < channels_alloc; i++) {
448 c = channels[i];
449 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000450#if 0
451 if (!compat20 &&
452 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100453 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000454 c->self, buffer_len(&c->input));
455 return 0;
456 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000457#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000458 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000459 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000460 c->self, buffer_len(&c->output),
461 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000462 return 0;
463 }
464 }
465 }
466 return 1;
467}
468
469/* Returns true if any channel is still open. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000470int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000471channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000472{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000473 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000474 Channel *c;
475
476 for (i = 0; i < channels_alloc; i++) {
477 c = channels[i];
478 if (c == NULL)
479 continue;
480 switch (c->type) {
481 case SSH_CHANNEL_X11_LISTENER:
482 case SSH_CHANNEL_PORT_LISTENER:
483 case SSH_CHANNEL_RPORT_LISTENER:
484 case SSH_CHANNEL_CLOSED:
485 case SSH_CHANNEL_AUTH_SOCKET:
486 case SSH_CHANNEL_DYNAMIC:
487 case SSH_CHANNEL_CONNECTING:
488 case SSH_CHANNEL_ZOMBIE:
489 continue;
490 case SSH_CHANNEL_LARVAL:
491 if (!compat20)
492 fatal("cannot happen: SSH_CHANNEL_LARVAL");
493 continue;
494 case SSH_CHANNEL_OPENING:
495 case SSH_CHANNEL_OPEN:
496 case SSH_CHANNEL_X11_OPEN:
497 return 1;
498 case SSH_CHANNEL_INPUT_DRAINING:
499 case SSH_CHANNEL_OUTPUT_DRAINING:
500 if (!compat13)
501 fatal("cannot happen: OUT_DRAIN");
502 return 1;
503 default:
504 fatal("channel_still_open: bad channel type %d", c->type);
505 /* NOTREACHED */
506 }
507 }
508 return 0;
509}
510
511/* Returns the id of an open channel suitable for keepaliving */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000512int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000513channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000514{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000515 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000516 Channel *c;
517
518 for (i = 0; i < channels_alloc; i++) {
519 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000520 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000521 continue;
522 switch (c->type) {
523 case SSH_CHANNEL_CLOSED:
524 case SSH_CHANNEL_DYNAMIC:
525 case SSH_CHANNEL_X11_LISTENER:
526 case SSH_CHANNEL_PORT_LISTENER:
527 case SSH_CHANNEL_RPORT_LISTENER:
528 case SSH_CHANNEL_OPENING:
529 case SSH_CHANNEL_CONNECTING:
530 case SSH_CHANNEL_ZOMBIE:
531 continue;
532 case SSH_CHANNEL_LARVAL:
533 case SSH_CHANNEL_AUTH_SOCKET:
534 case SSH_CHANNEL_OPEN:
535 case SSH_CHANNEL_X11_OPEN:
536 return i;
537 case SSH_CHANNEL_INPUT_DRAINING:
538 case SSH_CHANNEL_OUTPUT_DRAINING:
539 if (!compat13)
540 fatal("cannot happen: OUT_DRAIN");
541 return i;
542 default:
543 fatal("channel_find_open: bad channel type %d", c->type);
544 /* NOTREACHED */
545 }
546 }
547 return -1;
548}
549
550
551/*
552 * Returns a message describing the currently open forwarded connections,
553 * suitable for sending to the client. The message contains crlf pairs for
554 * newlines.
555 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000556char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000557channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000558{
559 Buffer buffer;
560 Channel *c;
561 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000562 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000563
564 buffer_init(&buffer);
565 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
566 buffer_append(&buffer, buf, strlen(buf));
567 for (i = 0; i < channels_alloc; i++) {
568 c = channels[i];
569 if (c == NULL)
570 continue;
571 switch (c->type) {
572 case SSH_CHANNEL_X11_LISTENER:
573 case SSH_CHANNEL_PORT_LISTENER:
574 case SSH_CHANNEL_RPORT_LISTENER:
575 case SSH_CHANNEL_CLOSED:
576 case SSH_CHANNEL_AUTH_SOCKET:
577 case SSH_CHANNEL_ZOMBIE:
578 continue;
579 case SSH_CHANNEL_LARVAL:
580 case SSH_CHANNEL_OPENING:
581 case SSH_CHANNEL_CONNECTING:
582 case SSH_CHANNEL_DYNAMIC:
583 case SSH_CHANNEL_OPEN:
584 case SSH_CHANNEL_X11_OPEN:
585 case SSH_CHANNEL_INPUT_DRAINING:
586 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000587 snprintf(buf, sizeof buf,
588 " #%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 +0000589 c->self, c->remote_name,
590 c->type, c->remote_id,
591 c->istate, buffer_len(&c->input),
592 c->ostate, buffer_len(&c->output),
Damien Miller0e220db2004-06-15 10:34:08 +1000593 c->rfd, c->wfd, c->ctl_fd);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000594 buffer_append(&buffer, buf, strlen(buf));
595 continue;
596 default:
597 fatal("channel_open_message: bad channel type %d", c->type);
598 /* NOTREACHED */
599 }
600 }
601 buffer_append(&buffer, "\0", 1);
602 cp = xstrdup(buffer_ptr(&buffer));
603 buffer_free(&buffer);
604 return cp;
605}
606
607void
608channel_send_open(int id)
609{
610 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000611
Ben Lindstrome9c99912001-06-09 00:41:05 +0000612 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000613 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000614 return;
615 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000616 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000617 packet_start(SSH2_MSG_CHANNEL_OPEN);
618 packet_put_cstring(c->ctype);
619 packet_put_int(c->self);
620 packet_put_int(c->local_window);
621 packet_put_int(c->local_maxpacket);
622 packet_send();
623}
624
625void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000626channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000627{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000628 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000629
Ben Lindstrome9c99912001-06-09 00:41:05 +0000630 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000631 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000632 return;
633 }
Damien Miller0e220db2004-06-15 10:34:08 +1000634 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000635 packet_start(SSH2_MSG_CHANNEL_REQUEST);
636 packet_put_int(c->remote_id);
637 packet_put_cstring(service);
638 packet_put_char(wantconfirm);
639}
Damien Miller4f7becb2006-03-26 14:10:14 +1100640
Ben Lindstrome9c99912001-06-09 00:41:05 +0000641void
Damien Miller0e220db2004-06-15 10:34:08 +1000642channel_register_confirm(int id, channel_callback_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000643{
644 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000645
Ben Lindstrome9c99912001-06-09 00:41:05 +0000646 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000647 logit("channel_register_comfirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000648 return;
649 }
Damien Miller67f0bc02002-02-05 12:23:08 +1100650 c->confirm = fn;
Damien Miller0e220db2004-06-15 10:34:08 +1000651 c->confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000652}
Damien Miller4f7becb2006-03-26 14:10:14 +1100653
Ben Lindstrome9c99912001-06-09 00:41:05 +0000654void
Damien Miller39eda6e2005-11-05 14:52:50 +1100655channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000656{
Damien Millerd47c62a2005-12-13 19:33:57 +1100657 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000658
Ben Lindstrome9c99912001-06-09 00:41:05 +0000659 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000660 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000661 return;
662 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000663 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100664 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000665}
Damien Miller4f7becb2006-03-26 14:10:14 +1100666
Ben Lindstrome9c99912001-06-09 00:41:05 +0000667void
668channel_cancel_cleanup(int id)
669{
Damien Millerd47c62a2005-12-13 19:33:57 +1100670 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000671
Ben Lindstrome9c99912001-06-09 00:41:05 +0000672 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000673 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000674 return;
675 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000676 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100677 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000678}
Damien Miller4f7becb2006-03-26 14:10:14 +1100679
Ben Lindstrome9c99912001-06-09 00:41:05 +0000680void
Damien Miller077b2382005-12-31 16:22:32 +1100681channel_register_filter(int id, channel_infilter_fn *ifn,
682 channel_outfilter_fn *ofn)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000683{
684 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000685
Ben Lindstrome9c99912001-06-09 00:41:05 +0000686 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000687 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000688 return;
689 }
Damien Miller077b2382005-12-31 16:22:32 +1100690 c->input_filter = ifn;
691 c->output_filter = ofn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000692}
693
694void
695channel_set_fds(int id, int rfd, int wfd, int efd,
Damien Miller2aa0c192002-02-19 15:20:08 +1100696 int extusage, int nonblock, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000697{
698 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000699
Ben Lindstrome9c99912001-06-09 00:41:05 +0000700 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
701 fatal("channel_activate for non-larval channel %d.", id);
702 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
703 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100704 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000705 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
706 packet_put_int(c->remote_id);
707 packet_put_int(c->local_window);
708 packet_send();
709}
710
Damien Miller5428f641999-11-25 11:54:57 +1100711/*
Damien Millerb38eff82000-04-01 11:09:21 +1000712 * 'channel_pre*' are called just before select() to add any bits relevant to
713 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100714 */
Damien Millerb38eff82000-04-01 11:09:21 +1000715/*
716 * 'channel_post*': perform any appropriate operations for channels which
717 * have events pending.
718 */
Damien Millerd62f2ca2006-03-26 13:57:41 +1100719typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000720chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
721chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
722
Ben Lindstrombba81212001-06-25 05:01:22 +0000723static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100724channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000725{
726 FD_SET(c->sock, readset);
727}
728
Ben Lindstrombba81212001-06-25 05:01:22 +0000729static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100730channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000731{
732 debug3("channel %d: waiting for connection", c->self);
733 FD_SET(c->sock, writeset);
734}
735
Ben Lindstrombba81212001-06-25 05:01:22 +0000736static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100737channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000738{
739 if (buffer_len(&c->input) < packet_get_maxsize())
740 FD_SET(c->sock, readset);
741 if (buffer_len(&c->output) > 0)
742 FD_SET(c->sock, writeset);
743}
744
Ben Lindstrombba81212001-06-25 05:01:22 +0000745static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100746channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000747{
Damien Millerde6987c2002-01-22 23:20:40 +1100748 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000749
Darren Tucker11327cc2005-03-14 23:22:25 +1100750 /* check buffer limits */
751 limit = MIN(limit, (BUFFER_MAX_LEN - BUFFER_MAX_CHUNK - CHAN_RBUF));
752
Damien Miller33b13562000-04-04 14:38:59 +1000753 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100754 limit > 0 &&
755 buffer_len(&c->input) < limit)
Damien Miller33b13562000-04-04 14:38:59 +1000756 FD_SET(c->rfd, readset);
757 if (c->ostate == CHAN_OUTPUT_OPEN ||
758 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
759 if (buffer_len(&c->output) > 0) {
760 FD_SET(c->wfd, writeset);
761 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000762 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000763 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
764 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000765 else
766 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000767 }
768 }
769 /** XXX check close conditions, too */
Damien Millerde6987c2002-01-22 23:20:40 +1100770 if (compat20 && c->efd != -1) {
Damien Miller33b13562000-04-04 14:38:59 +1000771 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
772 buffer_len(&c->extended) > 0)
773 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000774 else if (!(c->flags & CHAN_EOF_SENT) &&
775 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000776 buffer_len(&c->extended) < c->remote_window)
777 FD_SET(c->efd, readset);
778 }
Damien Miller0e220db2004-06-15 10:34:08 +1000779 /* XXX: What about efd? races? */
Darren Tuckerfc959702004-07-17 16:12:08 +1000780 if (compat20 && c->ctl_fd != -1 &&
Damien Miller0e220db2004-06-15 10:34:08 +1000781 c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN)
782 FD_SET(c->ctl_fd, readset);
Damien Miller33b13562000-04-04 14:38:59 +1000783}
784
Ben Lindstrombba81212001-06-25 05:01:22 +0000785static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100786channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000787{
788 if (buffer_len(&c->input) == 0) {
789 packet_start(SSH_MSG_CHANNEL_CLOSE);
790 packet_put_int(c->remote_id);
791 packet_send();
792 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000793 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000794 }
795}
796
Ben Lindstrombba81212001-06-25 05:01:22 +0000797static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100798channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000799{
800 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000801 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000802 else
Damien Millerb38eff82000-04-01 11:09:21 +1000803 FD_SET(c->sock, writeset);
804}
805
806/*
807 * This is a special state for X11 authentication spoofing. An opened X11
808 * connection (when authentication spoofing is being done) remains in this
809 * state until the first packet has been completely read. The authentication
810 * data in that packet is then substituted by the real data if it matches the
811 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000812 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000813 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000814 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000815static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000816x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000817{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000818 u_char *ucp;
819 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000820
821 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000822 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000823 return 0;
824
825 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100826 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000827 if (ucp[0] == 0x42) { /* Byte order MSB first. */
828 proto_len = 256 * ucp[6] + ucp[7];
829 data_len = 256 * ucp[8] + ucp[9];
830 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
831 proto_len = ucp[6] + 256 * ucp[7];
832 data_len = ucp[8] + 256 * ucp[9];
833 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000834 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100835 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000836 return -1;
837 }
838
839 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000840 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000841 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
842 return 0;
843
844 /* Check if authentication protocol matches. */
845 if (proto_len != strlen(x11_saved_proto) ||
846 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000847 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000848 return -1;
849 }
850 /* Check if authentication data matches our fake data. */
851 if (data_len != x11_fake_data_len ||
852 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
853 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000854 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000855 return -1;
856 }
857 /* Check fake data length */
858 if (x11_fake_data_len != x11_saved_data_len) {
859 error("X11 fake_data_len %d != saved_data_len %d",
860 x11_fake_data_len, x11_saved_data_len);
861 return -1;
862 }
863 /*
864 * Received authentication protocol and data match
865 * our fake data. Substitute the fake data with real
866 * data.
867 */
868 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
869 x11_saved_data, x11_saved_data_len);
870 return 1;
871}
872
Ben Lindstrombba81212001-06-25 05:01:22 +0000873static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100874channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000875{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000876 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000877
Damien Millerb38eff82000-04-01 11:09:21 +1000878 if (ret == 1) {
879 /* Start normal processing for the channel. */
880 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000881 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000882 } else if (ret == -1) {
883 /*
884 * We have received an X11 connection that has bad
885 * authentication information.
886 */
Damien Miller996acd22003-04-09 20:59:48 +1000887 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000888 buffer_clear(&c->input);
889 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000890 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000891 c->sock = -1;
892 c->type = SSH_CHANNEL_CLOSED;
893 packet_start(SSH_MSG_CHANNEL_CLOSE);
894 packet_put_int(c->remote_id);
895 packet_send();
896 }
897}
898
Ben Lindstrombba81212001-06-25 05:01:22 +0000899static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100900channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000901{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000902 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000903
904 /* c->force_drain = 1; */
905
Damien Millerb38eff82000-04-01 11:09:21 +1000906 if (ret == 1) {
907 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100908 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000909 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000910 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000911 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100912 chan_read_failed(c);
913 buffer_clear(&c->input);
914 chan_ibuf_empty(c);
915 buffer_clear(&c->output);
916 /* for proto v1, the peer will send an IEOF */
917 if (compat20)
918 chan_write_failed(c);
919 else
920 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000921 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000922 }
923}
924
Ben Lindstromb3921512001-04-11 15:57:50 +0000925/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000926static int
Damien Millerd62f2ca2006-03-26 13:57:41 +1100927channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000928{
Damien Millera10f5612002-09-12 09:49:15 +1000929 char *p, *host;
Damien Millereccb9de2005-06-17 12:59:34 +1000930 u_int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100931 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000932 struct {
933 u_int8_t version;
934 u_int8_t command;
935 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000936 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000937 } s4_req, s4_rsp;
938
Ben Lindstromb3921512001-04-11 15:57:50 +0000939 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000940
941 have = buffer_len(&c->input);
942 len = sizeof(s4_req);
943 if (have < len)
944 return 0;
945 p = buffer_ptr(&c->input);
946 for (found = 0, i = len; i < have; i++) {
947 if (p[i] == '\0') {
948 found = 1;
949 break;
950 }
951 if (i > 1024) {
952 /* the peer is probably sending garbage */
953 debug("channel %d: decode socks4: too long",
954 c->self);
955 return -1;
956 }
957 }
958 if (!found)
959 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000960 buffer_get(&c->input, (char *)&s4_req.version, 1);
961 buffer_get(&c->input, (char *)&s4_req.command, 1);
962 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000963 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000964 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000965 p = buffer_ptr(&c->input);
966 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000967 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000968 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000969 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000970 c->self, len, have);
971 strlcpy(username, p, sizeof(username));
972 buffer_consume(&c->input, len);
973 buffer_consume(&c->input, 1); /* trailing '\0' */
974
Ben Lindstromb3921512001-04-11 15:57:50 +0000975 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000976 strlcpy(c->path, host, sizeof(c->path));
977 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100978
Damien Millerfbdeece2003-09-02 22:52:31 +1000979 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000980 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000981
Ben Lindstromb3921512001-04-11 15:57:50 +0000982 if (s4_req.command != 1) {
983 debug("channel %d: cannot handle: socks4 cn %d",
984 c->self, s4_req.command);
985 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000986 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000987 s4_rsp.version = 0; /* vn: 0 for reply */
988 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000989 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000990 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000991 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000992 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000993}
994
Darren Tucker46471c92003-07-03 13:55:19 +1000995/* try to decode a socks5 header */
996#define SSH_SOCKS5_AUTHDONE 0x1000
997#define SSH_SOCKS5_NOAUTH 0x00
998#define SSH_SOCKS5_IPV4 0x01
999#define SSH_SOCKS5_DOMAIN 0x03
1000#define SSH_SOCKS5_IPV6 0x04
1001#define SSH_SOCKS5_CONNECT 0x01
1002#define SSH_SOCKS5_SUCCESS 0x00
1003
1004static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001005channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
Darren Tucker46471c92003-07-03 13:55:19 +10001006{
1007 struct {
1008 u_int8_t version;
1009 u_int8_t command;
1010 u_int8_t reserved;
1011 u_int8_t atyp;
1012 } s5_req, s5_rsp;
1013 u_int16_t dest_port;
1014 u_char *p, dest_addr[255+1];
Damien Millereccb9de2005-06-17 12:59:34 +10001015 u_int have, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001016
1017 debug2("channel %d: decode socks5", c->self);
1018 p = buffer_ptr(&c->input);
1019 if (p[0] != 0x05)
1020 return -1;
1021 have = buffer_len(&c->input);
1022 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1023 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001024 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001025 return 0;
1026 nmethods = p[1];
1027 if (have < nmethods + 2)
1028 return 0;
1029 /* look for method: "NO AUTHENTICATION REQUIRED" */
1030 for (found = 0, i = 2 ; i < nmethods + 2; i++) {
1031 if (p[i] == SSH_SOCKS5_NOAUTH ) {
1032 found = 1;
1033 break;
1034 }
1035 }
1036 if (!found) {
1037 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1038 c->self);
1039 return -1;
1040 }
1041 buffer_consume(&c->input, nmethods + 2);
1042 buffer_put_char(&c->output, 0x05); /* version */
1043 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1044 FD_SET(c->sock, writeset);
1045 c->flags |= SSH_SOCKS5_AUTHDONE;
1046 debug2("channel %d: socks5 auth done", c->self);
1047 return 0; /* need more */
1048 }
1049 debug2("channel %d: socks5 post auth", c->self);
1050 if (have < sizeof(s5_req)+1)
1051 return 0; /* need more */
1052 memcpy((char *)&s5_req, p, sizeof(s5_req));
1053 if (s5_req.version != 0x05 ||
1054 s5_req.command != SSH_SOCKS5_CONNECT ||
1055 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001056 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001057 return -1;
1058 }
Darren Tucker47eede72005-03-14 23:08:12 +11001059 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001060 case SSH_SOCKS5_IPV4:
1061 addrlen = 4;
1062 af = AF_INET;
1063 break;
1064 case SSH_SOCKS5_DOMAIN:
1065 addrlen = p[sizeof(s5_req)];
1066 af = -1;
1067 break;
1068 case SSH_SOCKS5_IPV6:
1069 addrlen = 16;
1070 af = AF_INET6;
1071 break;
1072 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001073 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001074 return -1;
1075 }
1076 if (have < 4 + addrlen + 2)
1077 return 0;
1078 buffer_consume(&c->input, sizeof(s5_req));
1079 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1080 buffer_consume(&c->input, 1); /* host string length */
1081 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1082 buffer_get(&c->input, (char *)&dest_port, 2);
1083 dest_addr[addrlen] = '\0';
1084 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
Darren Tucker1f8311c2004-05-13 16:39:33 +10001085 strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
Darren Tucker46471c92003-07-03 13:55:19 +10001086 else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
1087 return -1;
1088 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001089
Damien Millerfbdeece2003-09-02 22:52:31 +10001090 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001091 c->self, c->path, c->host_port, s5_req.command);
1092
1093 s5_rsp.version = 0x05;
1094 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1095 s5_rsp.reserved = 0; /* ignored */
1096 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1097 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1098 dest_port = 0; /* ignored */
1099
1100 buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp));
1101 buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr));
1102 buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port));
1103 return 1;
1104}
1105
Ben Lindstromb3921512001-04-11 15:57:50 +00001106/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001107static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001108channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstromb3921512001-04-11 15:57:50 +00001109{
1110 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001111 u_int have;
1112 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001113
1114 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +10001115 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +00001116 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001117 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001118 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001119 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001120 /* need more */
1121 FD_SET(c->sock, readset);
1122 return;
1123 }
1124 /* try to guess the protocol */
1125 p = buffer_ptr(&c->input);
1126 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001127 case 0x04:
1128 ret = channel_decode_socks4(c, readset, writeset);
1129 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001130 case 0x05:
1131 ret = channel_decode_socks5(c, readset, writeset);
1132 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001133 default:
1134 ret = -1;
1135 break;
1136 }
1137 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001138 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001139 } else if (ret == 0) {
1140 debug2("channel %d: pre_dynamic: need more", c->self);
1141 /* need more */
1142 FD_SET(c->sock, readset);
1143 } else {
1144 /* switch to the next state */
1145 c->type = SSH_CHANNEL_OPENING;
1146 port_open_helper(c, "direct-tcpip");
1147 }
1148}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001149
Damien Millerb38eff82000-04-01 11:09:21 +10001150/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +00001151static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001152channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001153{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001154 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001155 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001156 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001157 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001158 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001159 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001160
1161 if (FD_ISSET(c->sock, readset)) {
1162 debug("X11 connection requested.");
1163 addrlen = sizeof(addr);
1164 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001165 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001166 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001167 channel_close_fd(&c->sock);
1168 chan_mark_dead(c);
1169 }
Damien Millerb38eff82000-04-01 11:09:21 +10001170 if (newsock < 0) {
1171 error("accept: %.100s", strerror(errno));
1172 return;
1173 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001174 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001175 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001176 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001177 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001178 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001179
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001180 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001181 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001182 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001183 if (compat20) {
1184 packet_start(SSH2_MSG_CHANNEL_OPEN);
1185 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001186 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001187 packet_put_int(nc->local_window_max);
1188 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001189 /* originator ipaddr and port */
1190 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001191 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001192 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001193 } else {
1194 packet_put_int(remote_port);
1195 }
Damien Millerbd483e72000-04-30 10:00:53 +10001196 packet_send();
1197 } else {
1198 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001199 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001200 if (packet_get_protocol_flags() &
1201 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001202 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001203 packet_send();
1204 }
Damien Millerd83ff352001-01-30 09:19:34 +11001205 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001206 }
1207}
1208
Ben Lindstrombba81212001-06-25 05:01:22 +00001209static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001210port_open_helper(Channel *c, char *rtype)
1211{
1212 int direct;
1213 char buf[1024];
1214 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001215 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001216
1217 direct = (strcmp(rtype, "direct-tcpip") == 0);
1218
1219 snprintf(buf, sizeof buf,
1220 "%s: listening port %d for %.100s port %d, "
1221 "connect from %.200s port %d",
1222 rtype, c->listening_port, c->path, c->host_port,
1223 remote_ipaddr, remote_port);
1224
1225 xfree(c->remote_name);
1226 c->remote_name = xstrdup(buf);
1227
1228 if (compat20) {
1229 packet_start(SSH2_MSG_CHANNEL_OPEN);
1230 packet_put_cstring(rtype);
1231 packet_put_int(c->self);
1232 packet_put_int(c->local_window_max);
1233 packet_put_int(c->local_maxpacket);
1234 if (direct) {
1235 /* target host, port */
1236 packet_put_cstring(c->path);
1237 packet_put_int(c->host_port);
1238 } else {
1239 /* listen address, port */
1240 packet_put_cstring(c->path);
1241 packet_put_int(c->listening_port);
1242 }
1243 /* originator host and port */
1244 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001245 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001246 packet_send();
1247 } else {
1248 packet_start(SSH_MSG_PORT_OPEN);
1249 packet_put_int(c->self);
1250 packet_put_cstring(c->path);
1251 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001252 if (packet_get_protocol_flags() &
1253 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001254 packet_put_cstring(c->remote_name);
1255 packet_send();
1256 }
1257 xfree(remote_ipaddr);
1258}
1259
Damien Miller5e7fd072005-11-05 14:53:39 +11001260static void
1261channel_set_reuseaddr(int fd)
1262{
1263 int on = 1;
1264
1265 /*
1266 * Set socket options.
1267 * Allow local port reuse in TIME_WAIT.
1268 */
1269 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1270 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1271}
1272
Damien Millerb38eff82000-04-01 11:09:21 +10001273/*
1274 * This socket is listening for connections to a forwarded TCP/IP port.
1275 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001276static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001277channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001278{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001279 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001280 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001281 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001282 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001283 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001284
Damien Millerb38eff82000-04-01 11:09:21 +10001285 if (FD_ISSET(c->sock, readset)) {
1286 debug("Connection to port %d forwarding "
1287 "to %.100s port %d requested.",
1288 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001289
Damien Miller4623a752001-10-10 15:03:58 +10001290 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1291 nextstate = SSH_CHANNEL_OPENING;
1292 rtype = "forwarded-tcpip";
1293 } else {
1294 if (c->host_port == 0) {
1295 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001296 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001297 } else {
1298 nextstate = SSH_CHANNEL_OPENING;
1299 rtype = "direct-tcpip";
1300 }
1301 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001302
Damien Millerb38eff82000-04-01 11:09:21 +10001303 addrlen = sizeof(addr);
1304 newsock = accept(c->sock, &addr, &addrlen);
1305 if (newsock < 0) {
1306 error("accept: %.100s", strerror(errno));
1307 return;
1308 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001309 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001310 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1311 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001312 nc->listening_port = c->listening_port;
1313 nc->host_port = c->host_port;
1314 strlcpy(nc->path, c->path, sizeof(nc->path));
1315
Damien Miller4623a752001-10-10 15:03:58 +10001316 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1317 /*
1318 * do not call the channel_post handler until
1319 * this flag has been reset by a pre-handler.
1320 * otherwise the FD_ISSET calls might overflow
1321 */
1322 nc->delayed = 1;
1323 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001324 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001325 }
Damien Millerb38eff82000-04-01 11:09:21 +10001326 }
1327}
1328
1329/*
1330 * This is the authentication agent socket listening for connections from
1331 * clients.
1332 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001333static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001334channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001335{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001336 Channel *nc;
1337 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001338 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001339 socklen_t addrlen;
1340
1341 if (FD_ISSET(c->sock, readset)) {
1342 addrlen = sizeof(addr);
1343 newsock = accept(c->sock, &addr, &addrlen);
1344 if (newsock < 0) {
1345 error("accept from auth socket: %.100s", strerror(errno));
1346 return;
1347 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001348 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001349 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1350 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001351 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001352 if (compat20) {
1353 packet_start(SSH2_MSG_CHANNEL_OPEN);
1354 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001355 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001356 packet_put_int(c->local_window_max);
1357 packet_put_int(c->local_maxpacket);
1358 } else {
1359 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001360 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001361 }
Damien Millerb38eff82000-04-01 11:09:21 +10001362 packet_send();
1363 }
1364}
1365
Ben Lindstrombba81212001-06-25 05:01:22 +00001366static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001367channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001368{
Ben Lindstrom69128662001-05-08 20:07:39 +00001369 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001370 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001371
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001372 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001373 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001374 err = errno;
1375 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001376 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001377 if (err == 0) {
1378 debug("channel %d: connected", c->self);
1379 c->type = SSH_CHANNEL_OPEN;
1380 if (compat20) {
1381 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1382 packet_put_int(c->remote_id);
1383 packet_put_int(c->self);
1384 packet_put_int(c->local_window);
1385 packet_put_int(c->local_maxpacket);
1386 } else {
1387 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1388 packet_put_int(c->remote_id);
1389 packet_put_int(c->self);
1390 }
1391 } else {
1392 debug("channel %d: not connected: %s",
1393 c->self, strerror(err));
1394 if (compat20) {
1395 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1396 packet_put_int(c->remote_id);
1397 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1398 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1399 packet_put_cstring(strerror(err));
1400 packet_put_cstring("");
1401 }
1402 } else {
1403 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1404 packet_put_int(c->remote_id);
1405 }
1406 chan_mark_dead(c);
1407 }
1408 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001409 }
1410}
1411
Ben Lindstrombba81212001-06-25 05:01:22 +00001412static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001413channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001414{
Darren Tucker11327cc2005-03-14 23:22:25 +11001415 char buf[CHAN_RBUF];
Damien Millerb38eff82000-04-01 11:09:21 +10001416 int len;
1417
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001418 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001419 FD_ISSET(c->rfd, readset)) {
1420 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001421 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1422 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001423 if (len <= 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001424 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001425 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001426 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001427 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001428 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001429 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001430 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001431 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001432 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001433 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001434 } else {
1435 chan_read_failed(c);
1436 }
1437 return -1;
1438 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001439 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001440 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001441 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001442 chan_read_failed(c);
1443 }
Damien Millerd27b9472005-12-13 19:29:02 +11001444 } else if (c->datagram) {
1445 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001446 } else {
1447 buffer_append(&c->input, buf, len);
1448 }
Damien Millerb38eff82000-04-01 11:09:21 +10001449 }
1450 return 1;
1451}
Damien Miller4f7becb2006-03-26 14:10:14 +11001452
Ben Lindstrombba81212001-06-25 05:01:22 +00001453static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001454channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001455{
Ben Lindstrome229b252001-03-05 06:28:06 +00001456 struct termios tio;
Damien Miller077b2382005-12-31 16:22:32 +11001457 u_char *data = NULL, *buf;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001458 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 Miller077b2382005-12-31 16:22:32 +11001465 if (c->output_filter != NULL) {
1466 if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1467 debug2("channel %d: filter stops", c->self);
Damien Millere204f6a2006-01-31 21:47:15 +11001468 if (c->type != SSH_CHANNEL_OPEN)
1469 chan_mark_dead(c);
1470 else
1471 chan_write_failed(c);
1472 return -1;
Damien Miller077b2382005-12-31 16:22:32 +11001473 }
1474 } else if (c->datagram) {
1475 buf = data = buffer_get_string(&c->output, &dlen);
1476 } else {
1477 buf = data = buffer_ptr(&c->output);
1478 dlen = buffer_len(&c->output);
1479 }
1480
Damien Millerd27b9472005-12-13 19:29:02 +11001481 if (c->datagram) {
Damien Millerd27b9472005-12-13 19:29:02 +11001482 /* ignore truncated writes, datagrams might get lost */
1483 c->local_consumed += dlen + 4;
Damien Miller077b2382005-12-31 16:22:32 +11001484 len = write(c->wfd, buf, dlen);
Damien Millerd27b9472005-12-13 19:29:02 +11001485 xfree(data);
1486 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1487 return 1;
1488 if (len <= 0) {
1489 if (c->type != SSH_CHANNEL_OPEN)
1490 chan_mark_dead(c);
1491 else
1492 chan_write_failed(c);
1493 return -1;
1494 }
1495 return 1;
1496 }
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001497#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001498 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001499 if (compat20 && c->wfd_isatty)
1500 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001501#endif
Damien Miller077b2382005-12-31 16:22:32 +11001502
1503 len = write(c->wfd, buf, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001504 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1505 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001506 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001507 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001508 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001509 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001510 return -1;
1511 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001512 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001513 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001514 c->type = SSH_CHANNEL_INPUT_DRAINING;
1515 } else {
1516 chan_write_failed(c);
1517 }
1518 return -1;
1519 }
Damien Miller077b2382005-12-31 16:22:32 +11001520 if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001521 if (tcgetattr(c->wfd, &tio) == 0 &&
1522 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1523 /*
1524 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001525 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001526 * size of a SSH2_MSG_CHANNEL_DATA message
Damien Miller077b2382005-12-31 16:22:32 +11001527 * (4 byte channel id + buf)
Damien Miller79438cc2001-02-16 12:34:57 +11001528 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001529 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001530 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001531 }
1532 }
Damien Millerb38eff82000-04-01 11:09:21 +10001533 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001534 if (compat20 && len > 0) {
1535 c->local_consumed += len;
1536 }
1537 }
1538 return 1;
1539}
Damien Miller4f7becb2006-03-26 14:10:14 +11001540
Ben Lindstrombba81212001-06-25 05:01:22 +00001541static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001542channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller33b13562000-04-04 14:38:59 +10001543{
Darren Tucker11327cc2005-03-14 23:22:25 +11001544 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001545 int len;
1546
Damien Miller1383bd82000-04-06 12:32:37 +10001547/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001548 if (c->efd != -1) {
1549 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1550 FD_ISSET(c->efd, writeset) &&
1551 buffer_len(&c->extended) > 0) {
1552 len = write(c->efd, buffer_ptr(&c->extended),
1553 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001554 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001555 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 write-efd %d",
1560 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_consume(&c->extended, len);
1564 c->local_consumed += len;
1565 }
1566 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1567 FD_ISSET(c->efd, readset)) {
1568 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001569 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001570 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001571 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1572 return 1;
1573 if (len <= 0) {
1574 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001575 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001576 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001577 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001578 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001579 }
Damien Miller33b13562000-04-04 14:38:59 +10001580 }
1581 }
1582 return 1;
1583}
Damien Miller4f7becb2006-03-26 14:10:14 +11001584
Ben Lindstrombba81212001-06-25 05:01:22 +00001585static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001586channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller0e220db2004-06-15 10:34:08 +10001587{
1588 char buf[16];
1589 int len;
1590
1591 /* Monitor control fd to detect if the slave client exits */
1592 if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) {
1593 len = read(c->ctl_fd, buf, sizeof(buf));
1594 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1595 return 1;
1596 if (len <= 0) {
1597 debug2("channel %d: ctl read<=0", c->self);
1598 if (c->type != SSH_CHANNEL_OPEN) {
1599 debug2("channel %d: not open", c->self);
1600 chan_mark_dead(c);
1601 return -1;
1602 } else {
1603 chan_read_failed(c);
1604 chan_write_failed(c);
1605 }
1606 return -1;
1607 } else
1608 fatal("%s: unexpected data on ctl fd", __func__);
1609 }
1610 return 1;
1611}
Damien Miller4f7becb2006-03-26 14:10:14 +11001612
Damien Miller0e220db2004-06-15 10:34:08 +10001613static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001614channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001615{
Ben Lindstromb3921512001-04-11 15:57:50 +00001616 if (c->type == SSH_CHANNEL_OPEN &&
1617 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001618 c->local_window < c->local_window_max/2 &&
1619 c->local_consumed > 0) {
1620 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1621 packet_put_int(c->remote_id);
1622 packet_put_int(c->local_consumed);
1623 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001624 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001625 c->self, c->local_window,
1626 c->local_consumed);
1627 c->local_window += c->local_consumed;
1628 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001629 }
1630 return 1;
1631}
1632
Ben Lindstrombba81212001-06-25 05:01:22 +00001633static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001634channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001635{
Damien Miller4623a752001-10-10 15:03:58 +10001636 if (c->delayed)
1637 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001638 channel_handle_rfd(c, readset, writeset);
1639 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001640 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001641 return;
Damien Miller33b13562000-04-04 14:38:59 +10001642 channel_handle_efd(c, readset, writeset);
Damien Miller0e220db2004-06-15 10:34:08 +10001643 channel_handle_ctl(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001644 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001645}
1646
Ben Lindstrombba81212001-06-25 05:01:22 +00001647static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001648channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001649{
1650 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001651
Damien Millerb38eff82000-04-01 11:09:21 +10001652 /* Send buffered output data to the socket. */
1653 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1654 len = write(c->sock, buffer_ptr(&c->output),
1655 buffer_len(&c->output));
1656 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001657 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001658 else
1659 buffer_consume(&c->output, len);
1660 }
1661}
1662
Ben Lindstrombba81212001-06-25 05:01:22 +00001663static void
Damien Miller33b13562000-04-04 14:38:59 +10001664channel_handler_init_20(void)
1665{
Damien Millerde6987c2002-01-22 23:20:40 +11001666 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001667 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001668 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001669 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001670 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001671 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001672 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001673 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001674
Damien Millerde6987c2002-01-22 23:20:40 +11001675 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001676 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001677 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001678 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001679 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001680 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001681 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001682}
1683
Ben Lindstrombba81212001-06-25 05:01:22 +00001684static void
Damien Millerb38eff82000-04-01 11:09:21 +10001685channel_handler_init_13(void)
1686{
1687 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1688 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1689 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1690 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1691 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1692 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1693 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001694 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001695 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001696
Damien Millerde6987c2002-01-22 23:20:40 +11001697 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001698 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1699 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1700 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1701 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001702 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001703 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001704}
1705
Ben Lindstrombba81212001-06-25 05:01:22 +00001706static void
Damien Millerb38eff82000-04-01 11:09:21 +10001707channel_handler_init_15(void)
1708{
Damien Millerde6987c2002-01-22 23:20:40 +11001709 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001710 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001711 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1712 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1713 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001714 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001715 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001716
1717 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1718 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1719 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001720 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001721 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001722 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001723}
1724
Ben Lindstrombba81212001-06-25 05:01:22 +00001725static void
Damien Millerb38eff82000-04-01 11:09:21 +10001726channel_handler_init(void)
1727{
1728 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001729
Damien Miller9f0f5c62001-12-21 14:45:46 +11001730 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001731 channel_pre[i] = NULL;
1732 channel_post[i] = NULL;
1733 }
Damien Miller33b13562000-04-04 14:38:59 +10001734 if (compat20)
1735 channel_handler_init_20();
1736 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001737 channel_handler_init_13();
1738 else
1739 channel_handler_init_15();
1740}
1741
Damien Miller3ec27592001-10-12 11:35:04 +10001742/* gc dead channels */
1743static void
1744channel_garbage_collect(Channel *c)
1745{
1746 if (c == NULL)
1747 return;
1748 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11001749 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10001750 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001751 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001752 c->detach_user(c->self, NULL);
1753 /* if we still have a callback */
1754 if (c->detach_user != NULL)
1755 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001756 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001757 }
1758 if (!chan_is_dead(c, 1))
1759 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001760 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001761 channel_free(c);
1762}
1763
Ben Lindstrombba81212001-06-25 05:01:22 +00001764static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001765channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001766{
1767 static int did_init = 0;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001768 u_int i;
Damien Millerb38eff82000-04-01 11:09:21 +10001769 Channel *c;
1770
1771 if (!did_init) {
1772 channel_handler_init();
1773 did_init = 1;
1774 }
1775 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001776 c = channels[i];
1777 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001778 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001779 if (ftab[c->type] != NULL)
1780 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001781 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001782 }
1783}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001784
Ben Lindstrome9c99912001-06-09 00:41:05 +00001785/*
1786 * Allocate/update select bitmasks and add any bits relevant to channels in
1787 * select bitmasks.
1788 */
Damien Miller4af51302000-04-16 11:18:38 +10001789void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001790channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001791 u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001792{
Damien Miller36812092006-03-26 14:22:47 +11001793 u_int n, sz, nfdset;
Damien Miller5e953212001-01-30 09:14:00 +11001794
1795 n = MAX(*maxfdp, channel_max_fd);
1796
Damien Miller36812092006-03-26 14:22:47 +11001797 nfdset = howmany(n+1, NFDBITS);
1798 /* Explicitly test here, because xrealloc isn't always called */
1799 if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask))
1800 fatal("channel_prepare_select: max_fd (%d) is too large", n);
1801 sz = nfdset * sizeof(fd_mask);
1802
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001803 /* perhaps check sz < nalloc/2 and shrink? */
1804 if (*readsetp == NULL || sz > *nallocp) {
Damien Miller36812092006-03-26 14:22:47 +11001805 *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask));
1806 *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask));
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001807 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001808 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001809 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001810 memset(*readsetp, 0, sz);
1811 memset(*writesetp, 0, sz);
1812
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001813 if (!rekeying)
1814 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001815}
1816
Ben Lindstrome9c99912001-06-09 00:41:05 +00001817/*
1818 * After select, perform any appropriate operations for channels which have
1819 * events pending.
1820 */
Damien Miller4af51302000-04-16 11:18:38 +10001821void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001822channel_after_select(fd_set *readset, fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001823{
Damien Millerb38eff82000-04-01 11:09:21 +10001824 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001825}
1826
Ben Lindstrome9c99912001-06-09 00:41:05 +00001827
Damien Miller5e953212001-01-30 09:14:00 +11001828/* If there is data to send to the connection, enqueue some of it now. */
Damien Miller4af51302000-04-16 11:18:38 +10001829void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001830channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001831{
Damien Millerb38eff82000-04-01 11:09:21 +10001832 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001833 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001834
Damien Miller95def091999-11-25 00:26:21 +11001835 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001836 c = channels[i];
1837 if (c == NULL)
1838 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001839
Ben Lindstrome9c99912001-06-09 00:41:05 +00001840 /*
1841 * We are only interested in channels that can have buffered
1842 * incoming data.
1843 */
Damien Miller34132e52000-01-14 15:45:46 +11001844 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001845 if (c->type != SSH_CHANNEL_OPEN &&
1846 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001847 continue;
1848 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001849 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001850 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001851 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001852 if (compat20 &&
1853 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001854 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001855 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001856 continue;
1857 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001858
Damien Miller95def091999-11-25 00:26:21 +11001859 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001860 if ((c->istate == CHAN_INPUT_OPEN ||
1861 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1862 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11001863 if (c->datagram) {
1864 if (len > 0) {
1865 u_char *data;
1866 u_int dlen;
1867
1868 data = buffer_get_string(&c->input,
1869 &dlen);
1870 packet_start(SSH2_MSG_CHANNEL_DATA);
1871 packet_put_int(c->remote_id);
1872 packet_put_string(data, dlen);
1873 packet_send();
1874 c->remote_window -= dlen + 4;
1875 xfree(data);
1876 }
1877 continue;
1878 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001879 /*
1880 * Send some data for the other side over the secure
1881 * connection.
1882 */
Damien Miller33b13562000-04-04 14:38:59 +10001883 if (compat20) {
1884 if (len > c->remote_window)
1885 len = c->remote_window;
1886 if (len > c->remote_maxpacket)
1887 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001888 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001889 if (packet_is_interactive()) {
1890 if (len > 1024)
1891 len = 512;
1892 } else {
1893 /* Keep the packets at reasonable size. */
1894 if (len > packet_get_maxsize()/2)
1895 len = packet_get_maxsize()/2;
1896 }
Damien Miller95def091999-11-25 00:26:21 +11001897 }
Damien Millerb38eff82000-04-01 11:09:21 +10001898 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001899 packet_start(compat20 ?
1900 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001901 packet_put_int(c->remote_id);
1902 packet_put_string(buffer_ptr(&c->input), len);
1903 packet_send();
1904 buffer_consume(&c->input, len);
1905 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001906 }
1907 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001908 if (compat13)
1909 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001910 /*
1911 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001912 * tell peer, that we will not send more data: send IEOF.
1913 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001914 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001915 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10001916 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1917 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00001918 else
1919 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001920 }
Damien Miller33b13562000-04-04 14:38:59 +10001921 /* Send extended data, i.e. stderr */
1922 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001923 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001924 c->remote_window > 0 &&
1925 (len = buffer_len(&c->extended)) > 0 &&
1926 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001927 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001928 c->self, c->remote_window, buffer_len(&c->extended),
1929 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001930 if (len > c->remote_window)
1931 len = c->remote_window;
1932 if (len > c->remote_maxpacket)
1933 len = c->remote_maxpacket;
1934 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1935 packet_put_int(c->remote_id);
1936 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1937 packet_put_string(buffer_ptr(&c->extended), len);
1938 packet_send();
1939 buffer_consume(&c->extended, len);
1940 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001941 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001942 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001943 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001944}
1945
Ben Lindstrome9c99912001-06-09 00:41:05 +00001946
1947/* -- protocol input */
Damien Miller4af51302000-04-16 11:18:38 +10001948void
Damien Miller630d6f42002-01-22 23:17:30 +11001949channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001950{
Damien Miller34132e52000-01-14 15:45:46 +11001951 int id;
Damien Miller95def091999-11-25 00:26:21 +11001952 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001953 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001954 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001955
Damien Miller95def091999-11-25 00:26:21 +11001956 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001957 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001958 c = channel_lookup(id);
1959 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001960 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001961
Damien Miller95def091999-11-25 00:26:21 +11001962 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001963 if (c->type != SSH_CHANNEL_OPEN &&
1964 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001965 return;
1966
Damien Miller95def091999-11-25 00:26:21 +11001967 /* Get the data. */
1968 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001969
Damien Millera04ad492004-01-21 11:02:09 +11001970 /*
1971 * Ignore data for protocol > 1.3 if output end is no longer open.
1972 * For protocol 2 the sending side is reducing its window as it sends
1973 * data, so we must 'fake' consumption of the data in order to ensure
1974 * that window updates are sent back. Otherwise the connection might
1975 * deadlock.
1976 */
1977 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
1978 if (compat20) {
1979 c->local_window -= data_len;
1980 c->local_consumed += data_len;
1981 }
1982 xfree(data);
1983 return;
1984 }
1985
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001986 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001987 if (data_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10001988 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller33b13562000-04-04 14:38:59 +10001989 c->self, data_len, c->local_maxpacket);
1990 }
1991 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10001992 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10001993 c->self, data_len, c->local_window);
1994 xfree(data);
1995 return;
1996 }
1997 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001998 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001999 packet_check_eom();
Damien Millerd27b9472005-12-13 19:29:02 +11002000 if (c->datagram)
2001 buffer_put_string(&c->output, data, data_len);
2002 else
2003 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11002004 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002005}
Ben Lindstrome9c99912001-06-09 00:41:05 +00002006
Damien Miller4af51302000-04-16 11:18:38 +10002007void
Damien Miller630d6f42002-01-22 23:17:30 +11002008channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002009{
2010 int id;
Damien Miller33b13562000-04-04 14:38:59 +10002011 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00002012 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10002013 Channel *c;
2014
2015 /* Get the channel number and verify it. */
2016 id = packet_get_int();
2017 c = channel_lookup(id);
2018
2019 if (c == NULL)
2020 packet_disconnect("Received extended_data for bad channel %d.", id);
2021 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002022 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10002023 return;
2024 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002025 if (c->flags & CHAN_EOF_RCVD) {
2026 if (datafellows & SSH_BUG_EXTEOF)
2027 debug("channel %d: accepting ext data after eof", id);
2028 else
2029 packet_disconnect("Received extended_data after EOF "
2030 "on channel %d.", id);
2031 }
Damien Miller33b13562000-04-04 14:38:59 +10002032 tcode = packet_get_int();
2033 if (c->efd == -1 ||
2034 c->extended_usage != CHAN_EXTENDED_WRITE ||
2035 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002036 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002037 return;
2038 }
2039 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002040 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002041 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002042 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002043 c->self, data_len, c->local_window);
2044 xfree(data);
2045 return;
2046 }
Damien Millerd3444942000-09-30 14:20:03 +11002047 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002048 c->local_window -= data_len;
2049 buffer_append(&c->extended, data, data_len);
2050 xfree(data);
2051}
2052
Damien Miller4af51302000-04-16 11:18:38 +10002053void
Damien Miller630d6f42002-01-22 23:17:30 +11002054channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002055{
2056 int id;
2057 Channel *c;
2058
Damien Millerb38eff82000-04-01 11:09:21 +10002059 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002060 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002061 c = channel_lookup(id);
2062 if (c == NULL)
2063 packet_disconnect("Received ieof for nonexistent channel %d.", id);
2064 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002065
2066 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002067 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002068 debug("channel %d: FORCE input drain", c->self);
2069 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002070 if (buffer_len(&c->input) == 0)
2071 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002072 }
2073
Damien Millerb38eff82000-04-01 11:09:21 +10002074}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002075
Damien Miller4af51302000-04-16 11:18:38 +10002076void
Damien Miller630d6f42002-01-22 23:17:30 +11002077channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002078{
Damien Millerb38eff82000-04-01 11:09:21 +10002079 int id;
2080 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002081
Damien Millerb38eff82000-04-01 11:09:21 +10002082 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002083 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002084 c = channel_lookup(id);
2085 if (c == NULL)
2086 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002087
2088 /*
2089 * Send a confirmation that we have closed the channel and no more
2090 * data is coming for it.
2091 */
Damien Miller95def091999-11-25 00:26:21 +11002092 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002093 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002094 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002095
Damien Miller5428f641999-11-25 11:54:57 +11002096 /*
2097 * If the channel is in closed state, we have sent a close request,
2098 * and the other side will eventually respond with a confirmation.
2099 * Thus, we cannot free the channel here, because then there would be
2100 * no-one to receive the confirmation. The channel gets freed when
2101 * the confirmation arrives.
2102 */
Damien Millerb38eff82000-04-01 11:09:21 +10002103 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002104 /*
2105 * Not a closed channel - mark it as draining, which will
2106 * cause it to be freed later.
2107 */
Damien Miller76765c02002-01-22 23:21:15 +11002108 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002109 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002110 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002111}
2112
Damien Millerb38eff82000-04-01 11:09:21 +10002113/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10002114void
Damien Miller630d6f42002-01-22 23:17:30 +11002115channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002116{
Damien Millerb38eff82000-04-01 11:09:21 +10002117 int id = packet_get_int();
2118 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002119
Damien Miller48b03fc2002-01-22 23:11:40 +11002120 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002121 if (c == NULL)
2122 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2123 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002124}
2125
Damien Miller4af51302000-04-16 11:18:38 +10002126void
Damien Miller630d6f42002-01-22 23:17:30 +11002127channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002128{
2129 int id = packet_get_int();
2130 Channel *c = channel_lookup(id);
2131
Damien Miller48b03fc2002-01-22 23:11:40 +11002132 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002133 if (c == NULL)
2134 packet_disconnect("Received close confirmation for "
2135 "out-of-range channel %d.", id);
2136 if (c->type != SSH_CHANNEL_CLOSED)
2137 packet_disconnect("Received close confirmation for "
2138 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002139 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002140}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002141
Damien Miller4af51302000-04-16 11:18:38 +10002142void
Damien Miller630d6f42002-01-22 23:17:30 +11002143channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002144{
Damien Millerb38eff82000-04-01 11:09:21 +10002145 int id, remote_id;
2146 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002147
Damien Millerb38eff82000-04-01 11:09:21 +10002148 id = packet_get_int();
2149 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002150
Damien Millerb38eff82000-04-01 11:09:21 +10002151 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2152 packet_disconnect("Received open confirmation for "
2153 "non-opening channel %d.", id);
2154 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002155 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002156 c->remote_id = remote_id;
2157 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002158
2159 if (compat20) {
2160 c->remote_window = packet_get_int();
2161 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11002162 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002163 debug2("callback start");
Damien Miller0e220db2004-06-15 10:34:08 +10002164 c->confirm(c->self, c->confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002165 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002166 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002167 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002168 c->remote_window, c->remote_maxpacket);
2169 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002170 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002171}
2172
Ben Lindstrombba81212001-06-25 05:01:22 +00002173static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002174reason2txt(int reason)
2175{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002176 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002177 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2178 return "administratively prohibited";
2179 case SSH2_OPEN_CONNECT_FAILED:
2180 return "connect failed";
2181 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2182 return "unknown channel type";
2183 case SSH2_OPEN_RESOURCE_SHORTAGE:
2184 return "resource shortage";
2185 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002186 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002187}
2188
Damien Miller4af51302000-04-16 11:18:38 +10002189void
Damien Miller630d6f42002-01-22 23:17:30 +11002190channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002191{
Kevin Steves12057502001-02-05 14:54:34 +00002192 int id, reason;
2193 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002194 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002195
Damien Millerb38eff82000-04-01 11:09:21 +10002196 id = packet_get_int();
2197 c = channel_lookup(id);
2198
2199 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2200 packet_disconnect("Received open failure for "
2201 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002202 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002203 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002204 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002205 msg = packet_get_string(NULL);
2206 lang = packet_get_string(NULL);
2207 }
Damien Miller996acd22003-04-09 20:59:48 +10002208 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002209 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002210 if (msg != NULL)
2211 xfree(msg);
2212 if (lang != NULL)
2213 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10002214 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002215 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11002216 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002217 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002218}
2219
Damien Miller33b13562000-04-04 14:38:59 +10002220void
Damien Miller630d6f42002-01-22 23:17:30 +11002221channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002222{
2223 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002224 int id;
2225 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002226
2227 if (!compat20)
2228 return;
2229
2230 /* Get the channel number and verify it. */
2231 id = packet_get_int();
2232 c = channel_lookup(id);
2233
Damien Millerd47c62a2005-12-13 19:33:57 +11002234 if (c == NULL) {
2235 logit("Received window adjust for non-open channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002236 return;
2237 }
2238 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002239 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002240 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002241 c->remote_window += adjust;
2242}
2243
Damien Miller4af51302000-04-16 11:18:38 +10002244void
Damien Miller630d6f42002-01-22 23:17:30 +11002245channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002246{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002247 Channel *c = NULL;
2248 u_short host_port;
2249 char *host, *originator_string;
2250 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002251
Ben Lindstrome9c99912001-06-09 00:41:05 +00002252 remote_id = packet_get_int();
2253 host = packet_get_string(NULL);
2254 host_port = packet_get_int();
2255
2256 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2257 originator_string = packet_get_string(NULL);
2258 } else {
2259 originator_string = xstrdup("unknown (remote did not supply name)");
2260 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002261 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002262 sock = channel_connect_to(host, host_port);
2263 if (sock != -1) {
2264 c = channel_new("connected socket",
2265 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2266 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002267 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002268 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002269 xfree(originator_string);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002270 if (c == NULL) {
2271 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2272 packet_put_int(remote_id);
2273 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002274 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002275 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002276}
2277
2278
Ben Lindstrome9c99912001-06-09 00:41:05 +00002279/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002280
Ben Lindstrom908afed2001-10-03 17:34:59 +00002281void
2282channel_set_af(int af)
2283{
2284 IPv4or6 = af;
2285}
2286
Damien Millerb16461c2002-01-22 23:29:22 +11002287static int
2288channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2289 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002290{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002291 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002292 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002293 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002294 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002295 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002296
Damien Millerb16461c2002-01-22 23:29:22 +11002297 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2298 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002299 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002300
Damien Millerb16461c2002-01-22 23:29:22 +11002301 if (host == NULL) {
2302 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002303 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002304 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002305 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002306 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002307 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002308 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002309
Damien Miller5428f641999-11-25 11:54:57 +11002310 /*
Damien Millerf91ee4c2005-03-01 21:24:33 +11002311 * Determine whether or not a port forward listens to loopback,
Darren Tucker47eede72005-03-14 23:08:12 +11002312 * specified address or wildcard. On the client, a specified bind
2313 * address will always override gateway_ports. On the server, a
2314 * gateway_ports of 1 (``yes'') will override the client's
2315 * specification and force a wildcard bind, whereas a value of 2
2316 * (``clientspecified'') will bind to whatever address the client
Damien Millerf91ee4c2005-03-01 21:24:33 +11002317 * asked for.
2318 *
2319 * Special-case listen_addrs are:
2320 *
2321 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2322 * "" (empty string), "*" -> wildcard v4/v6
2323 * "localhost" -> loopback v4/v6
2324 */
2325 addr = NULL;
2326 if (listen_addr == NULL) {
2327 /* No address specified: default to gateway_ports setting */
2328 if (gateway_ports)
2329 wildcard = 1;
2330 } else if (gateway_ports || is_client) {
2331 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
2332 strcmp(listen_addr, "0.0.0.0") == 0) ||
2333 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2334 (!is_client && gateway_ports == 1))
2335 wildcard = 1;
2336 else if (strcmp(listen_addr, "localhost") != 0)
2337 addr = listen_addr;
2338 }
2339
2340 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2341 type, wildcard, (addr == NULL) ? "NULL" : addr);
2342
2343 /*
Damien Miller34132e52000-01-14 15:45:46 +11002344 * getaddrinfo returns a loopback address if the hostname is
2345 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002346 */
Damien Miller34132e52000-01-14 15:45:46 +11002347 memset(&hints, 0, sizeof(hints));
2348 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002349 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002350 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002351 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002352 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2353 if (addr == NULL) {
2354 /* This really shouldn't happen */
2355 packet_disconnect("getaddrinfo: fatal error: %s",
2356 gai_strerror(r));
2357 } else {
Damien Millera7270302005-07-06 09:36:05 +10002358 error("channel_setup_fwd_listener: "
Damien Millerf91ee4c2005-03-01 21:24:33 +11002359 "getaddrinfo(%.64s): %s", addr, gai_strerror(r));
2360 }
Damien Millera7270302005-07-06 09:36:05 +10002361 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002362 }
Damien Miller5428f641999-11-25 11:54:57 +11002363
Damien Miller34132e52000-01-14 15:45:46 +11002364 for (ai = aitop; ai; ai = ai->ai_next) {
2365 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2366 continue;
2367 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2368 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002369 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002370 continue;
2371 }
2372 /* Create a port to listen for the host. */
Damien Miller2372ace2003-05-14 13:42:23 +10002373 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002374 if (sock < 0) {
2375 /* this is no error since kernel may not support ipv6 */
2376 verbose("socket: %.100s", strerror(errno));
2377 continue;
2378 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002379
2380 channel_set_reuseaddr(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002381
Damien Miller34132e52000-01-14 15:45:46 +11002382 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002383
Damien Miller34132e52000-01-14 15:45:46 +11002384 /* Bind the socket to the address. */
2385 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2386 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002387 if (!ai->ai_next)
2388 error("bind: %.100s", strerror(errno));
2389 else
2390 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002391
Damien Miller34132e52000-01-14 15:45:46 +11002392 close(sock);
2393 continue;
2394 }
2395 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002396 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002397 error("listen: %.100s", strerror(errno));
2398 close(sock);
2399 continue;
2400 }
2401 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002402 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002403 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002404 0, "port listener", 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002405 strlcpy(c->path, host, sizeof(c->path));
2406 c->host_port = port_to_connect;
2407 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002408 success = 1;
2409 }
2410 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002411 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002412 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002413 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002414 return success;
Damien Miller95def091999-11-25 00:26:21 +11002415}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002416
Darren Tuckere7066df2004-05-24 10:18:05 +10002417int
2418channel_cancel_rport_listener(const char *host, u_short port)
2419{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002420 u_int i;
2421 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002422
Darren Tucker47eede72005-03-14 23:08:12 +11002423 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002424 Channel *c = channels[i];
2425
2426 if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
2427 strncmp(c->path, host, sizeof(c->path)) == 0 &&
Darren Tuckerfc959702004-07-17 16:12:08 +10002428 c->listening_port == port) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002429 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002430 channel_free(c);
2431 found = 1;
2432 }
2433 }
2434
2435 return (found);
2436}
2437
Damien Millerb16461c2002-01-22 23:29:22 +11002438/* protocol local port fwd, used by ssh (and sshd in v1) */
2439int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002440channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002441 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2442{
2443 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002444 listen_host, listen_port, host_to_connect, port_to_connect,
2445 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002446}
2447
2448/* protocol v2 remote port fwd, used by sshd */
2449int
2450channel_setup_remote_fwd_listener(const char *listen_address,
2451 u_short listen_port, int gateway_ports)
2452{
2453 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2454 listen_address, listen_port, NULL, 0, gateway_ports);
2455}
2456
Damien Miller5428f641999-11-25 11:54:57 +11002457/*
2458 * Initiate forwarding of connections to port "port" on remote host through
2459 * the secure channel to host:port from local side.
2460 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002461
Damien Miller4af51302000-04-16 11:18:38 +10002462void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002463channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002464 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002465{
Damien Millerdff50992002-01-22 23:16:32 +11002466 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002467
Damien Miller95def091999-11-25 00:26:21 +11002468 /* Record locally that connection to this host/port is permitted. */
2469 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2470 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002471
Damien Miller95def091999-11-25 00:26:21 +11002472 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002473 if (compat20) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11002474 const char *address_to_bind;
2475 if (listen_host == NULL)
2476 address_to_bind = "localhost";
2477 else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0)
2478 address_to_bind = "";
2479 else
2480 address_to_bind = listen_host;
2481
Damien Miller33b13562000-04-04 14:38:59 +10002482 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2483 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002484 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002485 packet_put_cstring(address_to_bind);
2486 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002487 packet_send();
2488 packet_write_wait();
2489 /* Assume that server accepts the request */
2490 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002491 } else {
2492 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002493 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002494 packet_put_cstring(host_to_connect);
2495 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002496 packet_send();
2497 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002498
2499 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002500 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002501 switch (type) {
2502 case SSH_SMSG_SUCCESS:
2503 success = 1;
2504 break;
2505 case SSH_SMSG_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +10002506 logit("Warning: Server denied remote port forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11002507 break;
2508 default:
2509 /* Unknown packet */
2510 packet_disconnect("Protocol error for port forward request:"
2511 "received packet type %d.", type);
2512 }
2513 }
2514 if (success) {
2515 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2516 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2517 permitted_opens[num_permitted_opens].listen_port = listen_port;
2518 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002519 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002520}
2521
Damien Miller5428f641999-11-25 11:54:57 +11002522/*
Darren Tuckerfc959702004-07-17 16:12:08 +10002523 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10002524 * local side.
2525 */
Darren Tuckere7066df2004-05-24 10:18:05 +10002526void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002527channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10002528{
2529 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10002530
2531 if (!compat20)
2532 return;
2533
2534 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10002535 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10002536 permitted_opens[i].listen_port == port)
2537 break;
2538 }
2539 if (i >= num_permitted_opens) {
2540 debug("%s: requested forward not found", __func__);
2541 return;
2542 }
2543 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2544 packet_put_cstring("cancel-tcpip-forward");
2545 packet_put_char(0);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002546 packet_put_cstring(host == NULL ? "" : host);
Darren Tuckere7066df2004-05-24 10:18:05 +10002547 packet_put_int(port);
2548 packet_send();
2549
2550 permitted_opens[i].listen_port = 0;
2551 permitted_opens[i].port_to_connect = 0;
Damien Miller0a0176e2005-11-05 15:07:59 +11002552 xfree(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10002553 permitted_opens[i].host_to_connect = NULL;
2554}
2555
2556/*
Damien Miller5428f641999-11-25 11:54:57 +11002557 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2558 * listening for the port, and sends back a success reply (or disconnect
2559 * message if there was an error). This never returns if there was an error.
2560 */
Damien Miller4af51302000-04-16 11:18:38 +10002561void
Damien Millere247cc42000-05-07 12:03:14 +10002562channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002563{
Damien Milleraae6c611999-12-06 11:47:28 +11002564 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002565 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002566
Damien Miller95def091999-11-25 00:26:21 +11002567 /* Get arguments from the packet. */
2568 port = packet_get_int();
2569 hostname = packet_get_string(NULL);
2570 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002571
Damien Millerbac2d8a2000-09-05 16:13:06 +11002572#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002573 /*
2574 * Check that an unprivileged user is not trying to forward a
2575 * privileged port.
2576 */
Damien Miller95def091999-11-25 00:26:21 +11002577 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10002578 packet_disconnect(
2579 "Requested forwarding of port %d but user is not root.",
2580 port);
2581 if (host_port == 0)
2582 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11002583#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10002584
Damien Miller0bc1bd82000-11-13 22:57:25 +11002585 /* Initiate forwarding */
Damien Millerf91ee4c2005-03-01 21:24:33 +11002586 channel_setup_local_fwd_listener(NULL, port, hostname,
2587 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002588
2589 /* Free the argument string. */
2590 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002591}
2592
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002593/*
2594 * Permits opening to any host/port if permitted_opens[] is empty. This is
2595 * usually called by the server, because the user could connect to any port
2596 * anyway, and the server has no way to know but to trust the client anyway.
2597 */
2598void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002599channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002600{
2601 if (num_permitted_opens == 0)
2602 all_opens_permitted = 1;
2603}
2604
Ben Lindstroma3700052001-04-05 23:26:32 +00002605void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002606channel_add_permitted_opens(char *host, int port)
2607{
2608 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2609 fatal("channel_request_remote_forwarding: too many forwards");
2610 debug("allow port forwarding to host %s port %d", host, port);
2611
2612 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2613 permitted_opens[num_permitted_opens].port_to_connect = port;
2614 num_permitted_opens++;
2615
2616 all_opens_permitted = 0;
2617}
2618
Ben Lindstroma3700052001-04-05 23:26:32 +00002619void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002620channel_clear_permitted_opens(void)
2621{
2622 int i;
2623
2624 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002625 if (permitted_opens[i].host_to_connect != NULL)
2626 xfree(permitted_opens[i].host_to_connect);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002627 num_permitted_opens = 0;
2628
2629}
2630
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002631/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002632static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002633connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002634{
Damien Miller34132e52000-01-14 15:45:46 +11002635 struct addrinfo hints, *ai, *aitop;
2636 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2637 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002638 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002639
Damien Miller34132e52000-01-14 15:45:46 +11002640 memset(&hints, 0, sizeof(hints));
2641 hints.ai_family = IPv4or6;
2642 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002643 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002644 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002645 error("connect_to %.100s: unknown host (%s)", host,
2646 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002647 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002648 }
Damien Miller34132e52000-01-14 15:45:46 +11002649 for (ai = aitop; ai; ai = ai->ai_next) {
2650 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2651 continue;
2652 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2653 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002654 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002655 continue;
2656 }
Damien Miller2372ace2003-05-14 13:42:23 +10002657 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002658 if (sock < 0) {
Damien Millerb46b9f32003-01-10 21:45:12 +11002659 if (ai->ai_next == NULL)
2660 error("socket: %.100s", strerror(errno));
2661 else
2662 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002663 continue;
2664 }
Damien Miller232711f2004-06-15 10:35:30 +10002665 if (set_nonblock(sock) == -1)
2666 fatal("%s: set_nonblock(%d)", __func__, sock);
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002667 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2668 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002669 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002670 strerror(errno));
2671 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002672 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002673 }
2674 break; /* success */
2675
2676 }
2677 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002678 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002679 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002680 return -1;
2681 }
2682 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002683 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002684 return sock;
2685}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002686
Damien Miller0bc1bd82000-11-13 22:57:25 +11002687int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002688channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002689{
2690 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002691
Damien Miller0bc1bd82000-11-13 22:57:25 +11002692 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002693 if (permitted_opens[i].host_to_connect != NULL &&
2694 permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002695 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002696 permitted_opens[i].host_to_connect,
2697 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002698 error("WARNING: Server requests forwarding for unknown listen_port %d",
2699 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002700 return -1;
2701}
Damien Millerb38eff82000-04-01 11:09:21 +10002702
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002703/* Check if connecting to that port is permitted and connect. */
2704int
2705channel_connect_to(const char *host, u_short port)
2706{
2707 int i, permit;
2708
2709 permit = all_opens_permitted;
2710 if (!permit) {
2711 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002712 if (permitted_opens[i].host_to_connect != NULL &&
2713 permitted_opens[i].port_to_connect == port &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002714 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2715 permit = 1;
2716
2717 }
2718 if (!permit) {
Damien Miller996acd22003-04-09 20:59:48 +10002719 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002720 "but the request was denied.", host, port);
2721 return -1;
2722 }
2723 return connect_to(host, port);
2724}
2725
Damien Miller0e220db2004-06-15 10:34:08 +10002726void
2727channel_send_window_changes(void)
2728{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002729 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10002730 struct winsize ws;
2731
2732 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11002733 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10002734 channels[i]->type != SSH_CHANNEL_OPEN)
2735 continue;
2736 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
2737 continue;
2738 channel_request_start(i, "window-change", 0);
Damien Miller71a73672006-03-26 14:04:36 +11002739 packet_put_int((u_int)ws.ws_col);
2740 packet_put_int((u_int)ws.ws_row);
2741 packet_put_int((u_int)ws.ws_xpixel);
2742 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10002743 packet_send();
2744 }
2745}
2746
Ben Lindstrome9c99912001-06-09 00:41:05 +00002747/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002748
Damien Miller5428f641999-11-25 11:54:57 +11002749/*
2750 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002751 * Returns 0 and a suitable display number for the DISPLAY variable
2752 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002753 */
Kevin Steves366298c2001-12-19 17:58:01 +00002754int
Damien Miller95c249f2002-02-05 12:11:34 +11002755x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10002756 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002757{
Damien Millere7378562001-12-21 14:58:35 +11002758 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002759 int display_number, sock;
2760 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002761 struct addrinfo hints, *ai, *aitop;
2762 char strport[NI_MAXSERV];
2763 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002764
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002765 if (chanids == NULL)
2766 return -1;
2767
Damien Millera34a28b1999-12-14 10:47:15 +11002768 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002769 display_number < MAX_DISPLAYS;
2770 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002771 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002772 memset(&hints, 0, sizeof(hints));
2773 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002774 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002775 hints.ai_socktype = SOCK_STREAM;
2776 snprintf(strport, sizeof strport, "%d", port);
2777 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2778 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002779 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002780 }
Damien Miller34132e52000-01-14 15:45:46 +11002781 for (ai = aitop; ai; ai = ai->ai_next) {
2782 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2783 continue;
Damien Miller2372ace2003-05-14 13:42:23 +10002784 sock = socket(ai->ai_family, ai->ai_socktype,
2785 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002786 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002787 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002788 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10002789 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00002790 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002791 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002792 debug("x11_create_display_inet: Socket family %d not supported",
2793 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002794 continue;
2795 }
Damien Miller34132e52000-01-14 15:45:46 +11002796 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002797#ifdef IPV6_V6ONLY
2798 if (ai->ai_family == AF_INET6) {
2799 int on = 1;
2800 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2801 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2802 }
2803#endif
Damien Miller5e7fd072005-11-05 14:53:39 +11002804 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11002805 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002806 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002807 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002808
2809 if (ai->ai_next)
2810 continue;
2811
Damien Miller34132e52000-01-14 15:45:46 +11002812 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002813 close(socks[n]);
2814 }
2815 num_socks = 0;
2816 break;
2817 }
2818 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002819#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002820 if (num_socks == NUM_SOCKS)
2821 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002822#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002823 if (x11_use_localhost) {
2824 if (num_socks == NUM_SOCKS)
2825 break;
2826 } else {
2827 break;
2828 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002829#endif
Damien Miller95def091999-11-25 00:26:21 +11002830 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002831 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002832 if (num_socks > 0)
2833 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002834 }
Damien Miller95def091999-11-25 00:26:21 +11002835 if (display_number >= MAX_DISPLAYS) {
2836 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002837 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002838 }
Damien Miller95def091999-11-25 00:26:21 +11002839 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002840 for (n = 0; n < num_socks; n++) {
2841 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11002842 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002843 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002844 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002845 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002846 }
Damien Miller95def091999-11-25 00:26:21 +11002847 }
Damien Miller34132e52000-01-14 15:45:46 +11002848
Damien Miller34132e52000-01-14 15:45:46 +11002849 /* Allocate a channel for each socket. */
Damien Miller07d86be2006-03-26 14:19:21 +11002850 *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
Damien Miller34132e52000-01-14 15:45:46 +11002851 for (n = 0; n < num_socks; n++) {
2852 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002853 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002854 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2855 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002856 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11002857 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002858 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11002859 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002860 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002861
Kevin Steves366298c2001-12-19 17:58:01 +00002862 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002863 *display_numberp = display_number;
2864 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002865}
2866
Ben Lindstrombba81212001-06-25 05:01:22 +00002867static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002868connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002869{
Damien Miller95def091999-11-25 00:26:21 +11002870 int sock;
2871 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002872
Damien Miller3afe3752001-12-21 12:39:51 +11002873 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2874 if (sock < 0)
2875 error("socket: %.100s", strerror(errno));
2876 memset(&addr, 0, sizeof(addr));
2877 addr.sun_family = AF_UNIX;
2878 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
Damien Miller90967402006-03-26 14:07:26 +11002879 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
Damien Miller3afe3752001-12-21 12:39:51 +11002880 return sock;
2881 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002882 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2883 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002884}
2885
Damien Millerbd483e72000-04-30 10:00:53 +10002886int
2887x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002888{
Damien Miller398e1cf2002-02-05 11:52:13 +11002889 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002890 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002891 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002892 struct addrinfo hints, *ai, *aitop;
2893 char strport[NI_MAXSERV];
2894 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002895
Damien Miller95def091999-11-25 00:26:21 +11002896 /* Try to open a socket for the local X server. */
2897 display = getenv("DISPLAY");
2898 if (!display) {
2899 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002900 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002901 }
Damien Miller5428f641999-11-25 11:54:57 +11002902 /*
2903 * Now we decode the value of the DISPLAY variable and make a
2904 * connection to the real X server.
2905 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002906
Damien Miller5428f641999-11-25 11:54:57 +11002907 /*
2908 * Check if it is a unix domain socket. Unix domain displays are in
2909 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2910 */
Damien Miller95def091999-11-25 00:26:21 +11002911 if (strncmp(display, "unix:", 5) == 0 ||
2912 display[0] == ':') {
2913 /* Connect to the unix domain socket. */
2914 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2915 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002916 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002917 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002918 }
2919 /* Create a socket. */
2920 sock = connect_local_xsocket(display_number);
2921 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002922 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002923
2924 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002925 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002926 }
Damien Miller5428f641999-11-25 11:54:57 +11002927 /*
2928 * Connect to an inet socket. The DISPLAY value is supposedly
2929 * hostname:d[.s], where hostname may also be numeric IP address.
2930 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002931 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002932 cp = strchr(buf, ':');
2933 if (!cp) {
2934 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002935 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002936 }
Damien Miller95def091999-11-25 00:26:21 +11002937 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002938 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002939 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2940 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002941 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002942 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002943 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002944
Damien Miller34132e52000-01-14 15:45:46 +11002945 /* Look up the host address */
2946 memset(&hints, 0, sizeof(hints));
2947 hints.ai_family = IPv4or6;
2948 hints.ai_socktype = SOCK_STREAM;
2949 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2950 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2951 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002952 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002953 }
Damien Miller34132e52000-01-14 15:45:46 +11002954 for (ai = aitop; ai; ai = ai->ai_next) {
2955 /* Create a socket. */
Damien Miller2372ace2003-05-14 13:42:23 +10002956 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002957 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002958 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002959 continue;
2960 }
2961 /* Connect it to the display. */
2962 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002963 debug2("connect %.100s port %d: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10002964 6000 + display_number, strerror(errno));
2965 close(sock);
2966 continue;
2967 }
2968 /* Success */
2969 break;
Damien Miller34132e52000-01-14 15:45:46 +11002970 }
Damien Miller34132e52000-01-14 15:45:46 +11002971 freeaddrinfo(aitop);
2972 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002973 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002974 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002975 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002976 }
Damien Miller398e1cf2002-02-05 11:52:13 +11002977 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10002978 return sock;
2979}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002980
Damien Millerbd483e72000-04-30 10:00:53 +10002981/*
2982 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2983 * the remote channel number. We should do whatever we want, and respond
2984 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2985 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002986
Damien Millerbd483e72000-04-30 10:00:53 +10002987void
Damien Miller630d6f42002-01-22 23:17:30 +11002988x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002989{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002990 Channel *c = NULL;
2991 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002992 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002993
2994 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002995
2996 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002997
2998 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002999 remote_host = packet_get_string(NULL);
3000 } else {
3001 remote_host = xstrdup("unknown (remote did not supply name)");
3002 }
Damien Miller48b03fc2002-01-22 23:11:40 +11003003 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10003004
3005 /* Obtain a connection to the real X display. */
3006 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003007 if (sock != -1) {
3008 /* Allocate a channel for this connection. */
3009 c = channel_new("connected x11 socket",
3010 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3011 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11003012 c->remote_id = remote_id;
3013 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003014 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003015 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003016 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10003017 /* Send refusal to the remote host. */
3018 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003019 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10003020 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10003021 /* Send a confirmation to the remote host. */
3022 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003023 packet_put_int(remote_id);
3024 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10003025 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003026 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003027}
3028
Damien Miller69b69aa2000-10-28 14:19:58 +11003029/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
3030void
Damien Miller630d6f42002-01-22 23:17:30 +11003031deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11003032{
3033 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00003034
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00003035 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11003036 case SSH_SMSG_AGENT_OPEN:
3037 error("Warning: ssh server tried agent forwarding.");
3038 break;
3039 case SSH_SMSG_X11_OPEN:
3040 error("Warning: ssh server tried X11 forwarding.");
3041 break;
3042 default:
Damien Miller630d6f42002-01-22 23:17:30 +11003043 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11003044 break;
3045 }
Damien Miller5eb137c2005-12-31 16:19:53 +11003046 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11003047 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3048 packet_put_int(rchan);
3049 packet_send();
3050}
3051
Damien Miller5428f641999-11-25 11:54:57 +11003052/*
3053 * Requests forwarding of X11 connections, generates fake authentication
3054 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00003055 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11003056 */
Damien Miller4af51302000-04-16 11:18:38 +10003057void
Damien Miller17e7ed02005-06-17 12:54:33 +10003058x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Millerbd483e72000-04-30 10:00:53 +10003059 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003060{
Ben Lindstrom46c16222000-12-22 01:43:59 +00003061 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10003062 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11003063 char *new_data;
3064 int screen_number;
3065 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10003066 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003067
Damien Millerf92c0792005-07-06 09:45:26 +10003068 if (x11_saved_display == NULL)
3069 x11_saved_display = xstrdup(disp);
3070 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10003071 error("x11_request_forwarding_with_spoofing: different "
3072 "$DISPLAY already forwarded");
3073 return;
3074 }
3075
Damien Miller17e7ed02005-06-17 12:54:33 +10003076 cp = disp;
3077 if (disp)
3078 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11003079 if (cp)
3080 cp = strchr(cp, '.');
3081 if (cp)
3082 screen_number = atoi(cp + 1);
3083 else
3084 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003085
Damien Miller13390022005-07-06 09:44:19 +10003086 if (x11_saved_proto == NULL) {
3087 /* Save protocol name. */
3088 x11_saved_proto = xstrdup(proto);
3089 /*
Damien Miller46d38de2005-07-17 17:02:09 +10003090 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10003091 * of the same length.
3092 */
3093 x11_saved_data = xmalloc(data_len);
3094 x11_fake_data = xmalloc(data_len);
3095 for (i = 0; i < data_len; i++) {
3096 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3097 fatal("x11_request_forwarding: bad "
3098 "authentication data: %.100s", data);
3099 if (i % 4 == 0)
3100 rnd = arc4random();
3101 x11_saved_data[i] = value;
3102 x11_fake_data[i] = rnd & 0xff;
3103 rnd >>= 8;
3104 }
3105 x11_saved_data_len = data_len;
3106 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003107 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003108
Damien Miller95def091999-11-25 00:26:21 +11003109 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003110 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003111
Damien Miller95def091999-11-25 00:26:21 +11003112 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003113 if (compat20) {
3114 channel_request_start(client_session_id, "x11-req", 0);
3115 packet_put_char(0); /* XXX bool single connection */
3116 } else {
3117 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3118 }
3119 packet_put_cstring(proto);
3120 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003121 packet_put_int(screen_number);
3122 packet_send();
3123 packet_write_wait();
3124 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003125}
3126
Ben Lindstrome9c99912001-06-09 00:41:05 +00003127
3128/* -- agent forwarding */
3129
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003130/* Sends a message to the server to request authentication fd forwarding. */
3131
Damien Miller4af51302000-04-16 11:18:38 +10003132void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003133auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003134{
Damien Miller95def091999-11-25 00:26:21 +11003135 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3136 packet_send();
3137 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003138}