blob: 8550e51ca77e6088114f0d371999581b0180cdf3 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * This file contains functions for generic socket connection forwarding.
6 * There is also code for initiating connection forwarding for X11 connections,
7 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10008 *
Damien Millere4340be2000-09-16 13:29:08 +11009 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose. Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
14 *
Damien Miller33b13562000-04-04 14:38:59 +100015 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110016 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110017 * Copyright (c) 1999 Dug Song. All rights reserved.
18 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110039 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41#include "includes.h"
Darren Tucker5d78de62004-11-05 20:35:44 +110042RCSID("$OpenBSD: channels.c,v 1.211 2004/10/29 21:47:15 djm Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100043
44#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000045#include "ssh1.h"
46#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100047#include "packet.h"
48#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000049#include "log.h"
50#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100051#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100052#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000053#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100054#include "key.h"
55#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110056#include "pathnames.h"
Darren Tucker46471c92003-07-03 13:55:19 +100057#include "bufaux.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100058
Ben Lindstrome9c99912001-06-09 00:41:05 +000059/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100060
Damien Miller5428f641999-11-25 11:54:57 +110061/*
62 * Pointer to an array containing all allocated channels. The array is
63 * dynamically extended as needed.
64 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000065static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100066
Damien Miller5428f641999-11-25 11:54:57 +110067/*
68 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000069 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110070 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100071static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100072
Damien Miller5428f641999-11-25 11:54:57 +110073/*
74 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000075 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110076 */
Damien Miller5e953212001-01-30 09:14:00 +110077static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100078
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079
Ben Lindstrome9c99912001-06-09 00:41:05 +000080/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081
Damien Miller5428f641999-11-25 11:54:57 +110082/*
83 * Data structure for storing which hosts are permitted for forward requests.
84 * The local sides of any remote forwards are stored in this array to prevent
85 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
86 * network (which might be behind a firewall).
87 */
Damien Miller95def091999-11-25 00:26:21 +110088typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +100089 char *host_to_connect; /* Connect to 'host'. */
90 u_short port_to_connect; /* Connect to 'port'. */
91 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092} ForwardPermission;
93
94/* List of all permitted host/port pairs to connect. */
95static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +000096
Damien Millerd4a8b7e1999-10-27 13:42:43 +100097/* Number of permitted host/port pairs in the array. */
98static int num_permitted_opens = 0;
Damien Miller5428f641999-11-25 11:54:57 +110099/*
100 * If this is true, all opens are permitted. This is the case on the server
101 * on which we have to trust the client anyway, and the user could do
102 * anything after logging in anyway.
103 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104static int all_opens_permitted = 0;
105
Ben Lindstrome9c99912001-06-09 00:41:05 +0000106
107/* -- X11 forwarding */
108
109/* Maximum number of fake X11 displays to try. */
110#define MAX_DISPLAYS 1000
111
112/* Saved X11 authentication protocol name. */
113static char *x11_saved_proto = NULL;
114
115/* Saved X11 authentication data. This is the real data. */
116static char *x11_saved_data = NULL;
117static u_int x11_saved_data_len = 0;
118
119/*
120 * Fake X11 authentication data. This is what the server will be sending us;
121 * we should replace any occurrences of this by the real data.
122 */
123static char *x11_fake_data = NULL;
124static u_int x11_fake_data_len;
125
126
127/* -- agent forwarding */
128
129#define NUM_SOCKS 10
130
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000131/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000132static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000133
Ben Lindstrome9c99912001-06-09 00:41:05 +0000134/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000135static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000136
Ben Lindstrome9c99912001-06-09 00:41:05 +0000137/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000138
139Channel *
140channel_lookup(int id)
141{
142 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000143
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000144 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Miller996acd22003-04-09 20:59:48 +1000145 logit("channel_lookup: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000146 return NULL;
147 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000148 c = channels[id];
149 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000150 logit("channel_lookup: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000151 return NULL;
152 }
153 return c;
154}
155
Damien Miller5428f641999-11-25 11:54:57 +1100156/*
Damien Millere247cc42000-05-07 12:03:14 +1000157 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000158 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100159 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000160
Ben Lindstrombba81212001-06-25 05:01:22 +0000161static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100162channel_register_fds(Channel *c, int rfd, int wfd, int efd,
163 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000164{
Damien Miller95def091999-11-25 00:26:21 +1100165 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100166 channel_max_fd = MAX(channel_max_fd, rfd);
167 channel_max_fd = MAX(channel_max_fd, wfd);
168 channel_max_fd = MAX(channel_max_fd, efd);
169
Damien Miller5428f641999-11-25 11:54:57 +1100170 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000171
Damien Miller6f83b8e2000-05-02 09:23:45 +1000172 c->rfd = rfd;
173 c->wfd = wfd;
174 c->sock = (rfd == wfd) ? rfd : -1;
Damien Miller0e220db2004-06-15 10:34:08 +1000175 c->ctl_fd = -1; /* XXX: set elsewhere */
Damien Miller6f83b8e2000-05-02 09:23:45 +1000176 c->efd = efd;
177 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100178
Damien Miller79438cc2001-02-16 12:34:57 +1100179 /* XXX ugly hack: nonblock is only set by the server */
180 if (nonblock && isatty(c->rfd)) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000181 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100182 c->isatty = 1;
183 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000184 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100185 c->self, c->wfd);
186 }
187 } else {
188 c->isatty = 0;
189 }
Ben Lindstrombeb5f332002-07-22 15:28:53 +0000190 c->wfd_isatty = isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100191
Damien Miller69b69aa2000-10-28 14:19:58 +1100192 /* enable nonblocking mode */
193 if (nonblock) {
194 if (rfd != -1)
195 set_nonblock(rfd);
196 if (wfd != -1)
197 set_nonblock(wfd);
198 if (efd != -1)
199 set_nonblock(efd);
200 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000201}
202
203/*
204 * Allocate a new channel object and set its type and socket. This will cause
205 * remote_name to be freed.
206 */
207
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000208Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000209channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000210 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000211{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000212 int found;
213 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000214 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000215
Damien Miller95def091999-11-25 00:26:21 +1100216 /* Do initial allocation if this is the first call. */
217 if (channels_alloc == 0) {
218 channels_alloc = 10;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000219 channels = xmalloc(channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100220 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000221 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100222 }
223 /* Try to find a free slot where to put the new channel. */
224 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000225 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100226 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000227 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100228 break;
229 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000230 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100231 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100232 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000233 if (channels_alloc > 10000)
234 fatal("channel_new: internal error: channels_alloc %d "
235 "too big.", channels_alloc);
Damien Miller5efcecc2003-09-17 07:31:14 +1000236 channels = xrealloc(channels,
237 (channels_alloc + 10) * sizeof(Channel *));
238 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100239 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100240 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000241 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100242 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000243 /* Initialize and return new channel. */
244 c = channels[found] = xmalloc(sizeof(Channel));
Damien Miller4623a752001-10-10 15:03:58 +1000245 memset(c, 0, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100246 buffer_init(&c->input);
247 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000248 buffer_init(&c->extended);
Damien Miller5144df92002-01-22 23:28:45 +1100249 c->ostate = CHAN_OUTPUT_OPEN;
250 c->istate = CHAN_INPUT_OPEN;
251 c->flags = 0;
Damien Miller69b69aa2000-10-28 14:19:58 +1100252 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100253 c->self = found;
254 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000255 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000256 c->local_window = window;
257 c->local_window_max = window;
258 c->local_consumed = 0;
259 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100260 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000261 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000262 c->remote_window = 0;
263 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000264 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100265 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000266 c->detach_user = NULL;
Damien Miller67f0bc02002-02-05 12:23:08 +1100267 c->confirm = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +1000268 c->confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000269 c->input_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100270 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000271 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000272}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000273
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000274static int
275channel_find_maxfd(void)
276{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000277 u_int i;
278 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000279 Channel *c;
280
281 for (i = 0; i < channels_alloc; i++) {
282 c = channels[i];
283 if (c != NULL) {
284 max = MAX(max, c->rfd);
285 max = MAX(max, c->wfd);
286 max = MAX(max, c->efd);
287 }
288 }
289 return max;
290}
291
292int
293channel_close_fd(int *fdp)
294{
295 int ret = 0, fd = *fdp;
296
297 if (fd != -1) {
298 ret = close(fd);
299 *fdp = -1;
300 if (fd == channel_max_fd)
301 channel_max_fd = channel_find_maxfd();
302 }
303 return ret;
304}
305
Damien Miller6f83b8e2000-05-02 09:23:45 +1000306/* Close all channel fd/socket. */
307
Ben Lindstrombba81212001-06-25 05:01:22 +0000308static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000309channel_close_fds(Channel *c)
310{
Damien Miller0e220db2004-06-15 10:34:08 +1000311 debug3("channel %d: close_fds r %d w %d e %d c %d",
312 c->self, c->rfd, c->wfd, c->efd, c->ctl_fd);
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000313
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000314 channel_close_fd(&c->sock);
Damien Miller0e220db2004-06-15 10:34:08 +1000315 channel_close_fd(&c->ctl_fd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000316 channel_close_fd(&c->rfd);
317 channel_close_fd(&c->wfd);
318 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000319}
320
321/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000322
Damien Miller4af51302000-04-16 11:18:38 +1000323void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000324channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000325{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000326 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000327 u_int i, n;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000328
329 for (n = 0, i = 0; i < channels_alloc; i++)
330 if (channels[i])
331 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000332 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000333 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000334
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000335 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000336 debug3("channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000337 xfree(s);
338
Damien Miller6f83b8e2000-05-02 09:23:45 +1000339 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000340 shutdown(c->sock, SHUT_RDWR);
Damien Miller0e220db2004-06-15 10:34:08 +1000341 if (c->ctl_fd != -1)
342 shutdown(c->ctl_fd, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000343 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000344 buffer_free(&c->input);
345 buffer_free(&c->output);
346 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000347 if (c->remote_name) {
348 xfree(c->remote_name);
349 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100350 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000351 channels[c->self] = NULL;
352 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000353}
354
Ben Lindstrome9c99912001-06-09 00:41:05 +0000355void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000356channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000357{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000358 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000359
Ben Lindstrom601e4362001-06-21 03:19:23 +0000360 for (i = 0; i < channels_alloc; i++)
361 if (channels[i] != NULL)
362 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000363}
364
365/*
366 * Closes the sockets/fds of all channels. This is used to close extra file
367 * descriptors after a fork.
368 */
369
370void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000371channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000372{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000373 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000374
375 for (i = 0; i < channels_alloc; i++)
376 if (channels[i] != NULL)
377 channel_close_fds(channels[i]);
378}
379
380/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000381 * Stop listening to channels.
382 */
383
384void
385channel_stop_listening(void)
386{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000387 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000388 Channel *c;
389
390 for (i = 0; i < channels_alloc; i++) {
391 c = channels[i];
392 if (c != NULL) {
393 switch (c->type) {
394 case SSH_CHANNEL_AUTH_SOCKET:
395 case SSH_CHANNEL_PORT_LISTENER:
396 case SSH_CHANNEL_RPORT_LISTENER:
397 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000398 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000399 channel_free(c);
400 break;
401 }
402 }
403 }
404}
405
406/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000407 * Returns true if no channel has too much buffered data, and false if one or
408 * more channel is overfull.
409 */
410
411int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000412channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000413{
414 u_int i;
415 Channel *c;
416
417 for (i = 0; i < channels_alloc; i++) {
418 c = channels[i];
419 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000420#if 0
421 if (!compat20 &&
422 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100423 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000424 c->self, buffer_len(&c->input));
425 return 0;
426 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000427#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000428 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000429 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000430 c->self, buffer_len(&c->output),
431 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000432 return 0;
433 }
434 }
435 }
436 return 1;
437}
438
439/* Returns true if any channel is still open. */
440
441int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000442channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000443{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000444 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000445 Channel *c;
446
447 for (i = 0; i < channels_alloc; i++) {
448 c = channels[i];
449 if (c == NULL)
450 continue;
451 switch (c->type) {
452 case SSH_CHANNEL_X11_LISTENER:
453 case SSH_CHANNEL_PORT_LISTENER:
454 case SSH_CHANNEL_RPORT_LISTENER:
455 case SSH_CHANNEL_CLOSED:
456 case SSH_CHANNEL_AUTH_SOCKET:
457 case SSH_CHANNEL_DYNAMIC:
458 case SSH_CHANNEL_CONNECTING:
459 case SSH_CHANNEL_ZOMBIE:
460 continue;
461 case SSH_CHANNEL_LARVAL:
462 if (!compat20)
463 fatal("cannot happen: SSH_CHANNEL_LARVAL");
464 continue;
465 case SSH_CHANNEL_OPENING:
466 case SSH_CHANNEL_OPEN:
467 case SSH_CHANNEL_X11_OPEN:
468 return 1;
469 case SSH_CHANNEL_INPUT_DRAINING:
470 case SSH_CHANNEL_OUTPUT_DRAINING:
471 if (!compat13)
472 fatal("cannot happen: OUT_DRAIN");
473 return 1;
474 default:
475 fatal("channel_still_open: bad channel type %d", c->type);
476 /* NOTREACHED */
477 }
478 }
479 return 0;
480}
481
482/* Returns the id of an open channel suitable for keepaliving */
483
484int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000485channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000486{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000487 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000488 Channel *c;
489
490 for (i = 0; i < channels_alloc; i++) {
491 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000492 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000493 continue;
494 switch (c->type) {
495 case SSH_CHANNEL_CLOSED:
496 case SSH_CHANNEL_DYNAMIC:
497 case SSH_CHANNEL_X11_LISTENER:
498 case SSH_CHANNEL_PORT_LISTENER:
499 case SSH_CHANNEL_RPORT_LISTENER:
500 case SSH_CHANNEL_OPENING:
501 case SSH_CHANNEL_CONNECTING:
502 case SSH_CHANNEL_ZOMBIE:
503 continue;
504 case SSH_CHANNEL_LARVAL:
505 case SSH_CHANNEL_AUTH_SOCKET:
506 case SSH_CHANNEL_OPEN:
507 case SSH_CHANNEL_X11_OPEN:
508 return i;
509 case SSH_CHANNEL_INPUT_DRAINING:
510 case SSH_CHANNEL_OUTPUT_DRAINING:
511 if (!compat13)
512 fatal("cannot happen: OUT_DRAIN");
513 return i;
514 default:
515 fatal("channel_find_open: bad channel type %d", c->type);
516 /* NOTREACHED */
517 }
518 }
519 return -1;
520}
521
522
523/*
524 * Returns a message describing the currently open forwarded connections,
525 * suitable for sending to the client. The message contains crlf pairs for
526 * newlines.
527 */
528
529char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000530channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000531{
532 Buffer buffer;
533 Channel *c;
534 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000535 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000536
537 buffer_init(&buffer);
538 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
539 buffer_append(&buffer, buf, strlen(buf));
540 for (i = 0; i < channels_alloc; i++) {
541 c = channels[i];
542 if (c == NULL)
543 continue;
544 switch (c->type) {
545 case SSH_CHANNEL_X11_LISTENER:
546 case SSH_CHANNEL_PORT_LISTENER:
547 case SSH_CHANNEL_RPORT_LISTENER:
548 case SSH_CHANNEL_CLOSED:
549 case SSH_CHANNEL_AUTH_SOCKET:
550 case SSH_CHANNEL_ZOMBIE:
551 continue;
552 case SSH_CHANNEL_LARVAL:
553 case SSH_CHANNEL_OPENING:
554 case SSH_CHANNEL_CONNECTING:
555 case SSH_CHANNEL_DYNAMIC:
556 case SSH_CHANNEL_OPEN:
557 case SSH_CHANNEL_X11_OPEN:
558 case SSH_CHANNEL_INPUT_DRAINING:
559 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000560 snprintf(buf, sizeof buf,
561 " #%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 +0000562 c->self, c->remote_name,
563 c->type, c->remote_id,
564 c->istate, buffer_len(&c->input),
565 c->ostate, buffer_len(&c->output),
Damien Miller0e220db2004-06-15 10:34:08 +1000566 c->rfd, c->wfd, c->ctl_fd);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000567 buffer_append(&buffer, buf, strlen(buf));
568 continue;
569 default:
570 fatal("channel_open_message: bad channel type %d", c->type);
571 /* NOTREACHED */
572 }
573 }
574 buffer_append(&buffer, "\0", 1);
575 cp = xstrdup(buffer_ptr(&buffer));
576 buffer_free(&buffer);
577 return cp;
578}
579
580void
581channel_send_open(int id)
582{
583 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000584
Ben Lindstrome9c99912001-06-09 00:41:05 +0000585 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000586 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000587 return;
588 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000589 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000590 packet_start(SSH2_MSG_CHANNEL_OPEN);
591 packet_put_cstring(c->ctype);
592 packet_put_int(c->self);
593 packet_put_int(c->local_window);
594 packet_put_int(c->local_maxpacket);
595 packet_send();
596}
597
598void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000599channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000600{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000601 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000602
Ben Lindstrome9c99912001-06-09 00:41:05 +0000603 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000604 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000605 return;
606 }
Damien Miller0e220db2004-06-15 10:34:08 +1000607 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000608 packet_start(SSH2_MSG_CHANNEL_REQUEST);
609 packet_put_int(c->remote_id);
610 packet_put_cstring(service);
611 packet_put_char(wantconfirm);
612}
613void
Damien Miller0e220db2004-06-15 10:34:08 +1000614channel_register_confirm(int id, channel_callback_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000615{
616 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000617
Ben Lindstrome9c99912001-06-09 00:41:05 +0000618 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000619 logit("channel_register_comfirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000620 return;
621 }
Damien Miller67f0bc02002-02-05 12:23:08 +1100622 c->confirm = fn;
Damien Miller0e220db2004-06-15 10:34:08 +1000623 c->confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000624}
625void
626channel_register_cleanup(int id, channel_callback_fn *fn)
627{
628 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_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000632 return;
633 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000634 c->detach_user = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000635}
636void
637channel_cancel_cleanup(int id)
638{
639 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000640
Ben Lindstrome9c99912001-06-09 00:41:05 +0000641 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000642 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000643 return;
644 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000645 c->detach_user = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000646}
647void
648channel_register_filter(int id, channel_filter_fn *fn)
649{
650 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000651
Ben Lindstrome9c99912001-06-09 00:41:05 +0000652 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000653 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000654 return;
655 }
656 c->input_filter = fn;
657}
658
659void
660channel_set_fds(int id, int rfd, int wfd, int efd,
Damien Miller2aa0c192002-02-19 15:20:08 +1100661 int extusage, int nonblock, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000662{
663 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000664
Ben Lindstrome9c99912001-06-09 00:41:05 +0000665 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
666 fatal("channel_activate for non-larval channel %d.", id);
667 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
668 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100669 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000670 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
671 packet_put_int(c->remote_id);
672 packet_put_int(c->local_window);
673 packet_send();
674}
675
Damien Miller5428f641999-11-25 11:54:57 +1100676/*
Damien Millerb38eff82000-04-01 11:09:21 +1000677 * 'channel_pre*' are called just before select() to add any bits relevant to
678 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100679 */
Damien Millerb38eff82000-04-01 11:09:21 +1000680/*
681 * 'channel_post*': perform any appropriate operations for channels which
682 * have events pending.
683 */
684typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
685chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
686chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
687
Ben Lindstrombba81212001-06-25 05:01:22 +0000688static void
Damien Millerb38eff82000-04-01 11:09:21 +1000689channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
690{
691 FD_SET(c->sock, readset);
692}
693
Ben Lindstrombba81212001-06-25 05:01:22 +0000694static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000695channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
696{
697 debug3("channel %d: waiting for connection", c->self);
698 FD_SET(c->sock, writeset);
699}
700
Ben Lindstrombba81212001-06-25 05:01:22 +0000701static void
Damien Millerb38eff82000-04-01 11:09:21 +1000702channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
703{
704 if (buffer_len(&c->input) < packet_get_maxsize())
705 FD_SET(c->sock, readset);
706 if (buffer_len(&c->output) > 0)
707 FD_SET(c->sock, writeset);
708}
709
Ben Lindstrombba81212001-06-25 05:01:22 +0000710static void
Damien Millerde6987c2002-01-22 23:20:40 +1100711channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000712{
Damien Millerde6987c2002-01-22 23:20:40 +1100713 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000714
Damien Miller33b13562000-04-04 14:38:59 +1000715 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100716 limit > 0 &&
717 buffer_len(&c->input) < limit)
Damien Miller33b13562000-04-04 14:38:59 +1000718 FD_SET(c->rfd, readset);
719 if (c->ostate == CHAN_OUTPUT_OPEN ||
720 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
721 if (buffer_len(&c->output) > 0) {
722 FD_SET(c->wfd, writeset);
723 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000724 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000725 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
726 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000727 else
728 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000729 }
730 }
731 /** XXX check close conditions, too */
Damien Millerde6987c2002-01-22 23:20:40 +1100732 if (compat20 && c->efd != -1) {
Damien Miller33b13562000-04-04 14:38:59 +1000733 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
734 buffer_len(&c->extended) > 0)
735 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000736 else if (!(c->flags & CHAN_EOF_SENT) &&
737 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000738 buffer_len(&c->extended) < c->remote_window)
739 FD_SET(c->efd, readset);
740 }
Damien Miller0e220db2004-06-15 10:34:08 +1000741 /* XXX: What about efd? races? */
Darren Tuckerfc959702004-07-17 16:12:08 +1000742 if (compat20 && c->ctl_fd != -1 &&
Damien Miller0e220db2004-06-15 10:34:08 +1000743 c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN)
744 FD_SET(c->ctl_fd, readset);
Damien Miller33b13562000-04-04 14:38:59 +1000745}
746
Ben Lindstrombba81212001-06-25 05:01:22 +0000747static void
Damien Millerb38eff82000-04-01 11:09:21 +1000748channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
749{
750 if (buffer_len(&c->input) == 0) {
751 packet_start(SSH_MSG_CHANNEL_CLOSE);
752 packet_put_int(c->remote_id);
753 packet_send();
754 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000755 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000756 }
757}
758
Ben Lindstrombba81212001-06-25 05:01:22 +0000759static void
Damien Millerb38eff82000-04-01 11:09:21 +1000760channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
761{
762 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000763 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000764 else
Damien Millerb38eff82000-04-01 11:09:21 +1000765 FD_SET(c->sock, writeset);
766}
767
768/*
769 * This is a special state for X11 authentication spoofing. An opened X11
770 * connection (when authentication spoofing is being done) remains in this
771 * state until the first packet has been completely read. The authentication
772 * data in that packet is then substituted by the real data if it matches the
773 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000774 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000775 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000776 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000777static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000778x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000779{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000780 u_char *ucp;
781 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000782
783 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000784 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000785 return 0;
786
787 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100788 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000789 if (ucp[0] == 0x42) { /* Byte order MSB first. */
790 proto_len = 256 * ucp[6] + ucp[7];
791 data_len = 256 * ucp[8] + ucp[9];
792 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
793 proto_len = ucp[6] + 256 * ucp[7];
794 data_len = ucp[8] + 256 * ucp[9];
795 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000796 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100797 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000798 return -1;
799 }
800
801 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000802 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000803 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
804 return 0;
805
806 /* Check if authentication protocol matches. */
807 if (proto_len != strlen(x11_saved_proto) ||
808 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000809 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000810 return -1;
811 }
812 /* Check if authentication data matches our fake data. */
813 if (data_len != x11_fake_data_len ||
814 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
815 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000816 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000817 return -1;
818 }
819 /* Check fake data length */
820 if (x11_fake_data_len != x11_saved_data_len) {
821 error("X11 fake_data_len %d != saved_data_len %d",
822 x11_fake_data_len, x11_saved_data_len);
823 return -1;
824 }
825 /*
826 * Received authentication protocol and data match
827 * our fake data. Substitute the fake data with real
828 * data.
829 */
830 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
831 x11_saved_data, x11_saved_data_len);
832 return 1;
833}
834
Ben Lindstrombba81212001-06-25 05:01:22 +0000835static void
Damien Millerb38eff82000-04-01 11:09:21 +1000836channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
837{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000838 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000839
Damien Millerb38eff82000-04-01 11:09:21 +1000840 if (ret == 1) {
841 /* Start normal processing for the channel. */
842 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000843 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000844 } else if (ret == -1) {
845 /*
846 * We have received an X11 connection that has bad
847 * authentication information.
848 */
Damien Miller996acd22003-04-09 20:59:48 +1000849 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000850 buffer_clear(&c->input);
851 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000852 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000853 c->sock = -1;
854 c->type = SSH_CHANNEL_CLOSED;
855 packet_start(SSH_MSG_CHANNEL_CLOSE);
856 packet_put_int(c->remote_id);
857 packet_send();
858 }
859}
860
Ben Lindstrombba81212001-06-25 05:01:22 +0000861static void
Damien Millerbd483e72000-04-30 10:00:53 +1000862channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000863{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000864 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000865
866 /* c->force_drain = 1; */
867
Damien Millerb38eff82000-04-01 11:09:21 +1000868 if (ret == 1) {
869 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100870 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000871 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000872 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000873 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100874 chan_read_failed(c);
875 buffer_clear(&c->input);
876 chan_ibuf_empty(c);
877 buffer_clear(&c->output);
878 /* for proto v1, the peer will send an IEOF */
879 if (compat20)
880 chan_write_failed(c);
881 else
882 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000883 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000884 }
885}
886
Ben Lindstromb3921512001-04-11 15:57:50 +0000887/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000888static int
Ben Lindstromb3921512001-04-11 15:57:50 +0000889channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000890{
Damien Millera10f5612002-09-12 09:49:15 +1000891 char *p, *host;
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000892 int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100893 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000894 struct {
895 u_int8_t version;
896 u_int8_t command;
897 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000898 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000899 } s4_req, s4_rsp;
900
Ben Lindstromb3921512001-04-11 15:57:50 +0000901 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000902
903 have = buffer_len(&c->input);
904 len = sizeof(s4_req);
905 if (have < len)
906 return 0;
907 p = buffer_ptr(&c->input);
908 for (found = 0, i = len; i < have; i++) {
909 if (p[i] == '\0') {
910 found = 1;
911 break;
912 }
913 if (i > 1024) {
914 /* the peer is probably sending garbage */
915 debug("channel %d: decode socks4: too long",
916 c->self);
917 return -1;
918 }
919 }
920 if (!found)
921 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000922 buffer_get(&c->input, (char *)&s4_req.version, 1);
923 buffer_get(&c->input, (char *)&s4_req.command, 1);
924 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000925 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000926 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000927 p = buffer_ptr(&c->input);
928 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000929 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000930 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000931 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000932 c->self, len, have);
933 strlcpy(username, p, sizeof(username));
934 buffer_consume(&c->input, len);
935 buffer_consume(&c->input, 1); /* trailing '\0' */
936
Ben Lindstromb3921512001-04-11 15:57:50 +0000937 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000938 strlcpy(c->path, host, sizeof(c->path));
939 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100940
Damien Millerfbdeece2003-09-02 22:52:31 +1000941 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000942 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000943
Ben Lindstromb3921512001-04-11 15:57:50 +0000944 if (s4_req.command != 1) {
945 debug("channel %d: cannot handle: socks4 cn %d",
946 c->self, s4_req.command);
947 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000948 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000949 s4_rsp.version = 0; /* vn: 0 for reply */
950 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000951 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000952 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000953 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000954 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000955}
956
Darren Tucker46471c92003-07-03 13:55:19 +1000957/* try to decode a socks5 header */
958#define SSH_SOCKS5_AUTHDONE 0x1000
959#define SSH_SOCKS5_NOAUTH 0x00
960#define SSH_SOCKS5_IPV4 0x01
961#define SSH_SOCKS5_DOMAIN 0x03
962#define SSH_SOCKS5_IPV6 0x04
963#define SSH_SOCKS5_CONNECT 0x01
964#define SSH_SOCKS5_SUCCESS 0x00
965
966static int
967channel_decode_socks5(Channel *c, fd_set * readset, fd_set * writeset)
968{
969 struct {
970 u_int8_t version;
971 u_int8_t command;
972 u_int8_t reserved;
973 u_int8_t atyp;
974 } s5_req, s5_rsp;
975 u_int16_t dest_port;
976 u_char *p, dest_addr[255+1];
977 int i, have, found, nmethods, addrlen, af;
978
979 debug2("channel %d: decode socks5", c->self);
980 p = buffer_ptr(&c->input);
981 if (p[0] != 0x05)
982 return -1;
983 have = buffer_len(&c->input);
984 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
985 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +1100986 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +1000987 return 0;
988 nmethods = p[1];
989 if (have < nmethods + 2)
990 return 0;
991 /* look for method: "NO AUTHENTICATION REQUIRED" */
992 for (found = 0, i = 2 ; i < nmethods + 2; i++) {
993 if (p[i] == SSH_SOCKS5_NOAUTH ) {
994 found = 1;
995 break;
996 }
997 }
998 if (!found) {
999 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1000 c->self);
1001 return -1;
1002 }
1003 buffer_consume(&c->input, nmethods + 2);
1004 buffer_put_char(&c->output, 0x05); /* version */
1005 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1006 FD_SET(c->sock, writeset);
1007 c->flags |= SSH_SOCKS5_AUTHDONE;
1008 debug2("channel %d: socks5 auth done", c->self);
1009 return 0; /* need more */
1010 }
1011 debug2("channel %d: socks5 post auth", c->self);
1012 if (have < sizeof(s5_req)+1)
1013 return 0; /* need more */
1014 memcpy((char *)&s5_req, p, sizeof(s5_req));
1015 if (s5_req.version != 0x05 ||
1016 s5_req.command != SSH_SOCKS5_CONNECT ||
1017 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001018 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001019 return -1;
1020 }
1021 switch(s5_req.atyp){
1022 case SSH_SOCKS5_IPV4:
1023 addrlen = 4;
1024 af = AF_INET;
1025 break;
1026 case SSH_SOCKS5_DOMAIN:
1027 addrlen = p[sizeof(s5_req)];
1028 af = -1;
1029 break;
1030 case SSH_SOCKS5_IPV6:
1031 addrlen = 16;
1032 af = AF_INET6;
1033 break;
1034 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001035 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001036 return -1;
1037 }
1038 if (have < 4 + addrlen + 2)
1039 return 0;
1040 buffer_consume(&c->input, sizeof(s5_req));
1041 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1042 buffer_consume(&c->input, 1); /* host string length */
1043 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1044 buffer_get(&c->input, (char *)&dest_port, 2);
1045 dest_addr[addrlen] = '\0';
1046 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
Darren Tucker1f8311c2004-05-13 16:39:33 +10001047 strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
Darren Tucker46471c92003-07-03 13:55:19 +10001048 else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
1049 return -1;
1050 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001051
Damien Millerfbdeece2003-09-02 22:52:31 +10001052 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001053 c->self, c->path, c->host_port, s5_req.command);
1054
1055 s5_rsp.version = 0x05;
1056 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1057 s5_rsp.reserved = 0; /* ignored */
1058 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1059 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1060 dest_port = 0; /* ignored */
1061
1062 buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp));
1063 buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr));
1064 buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port));
1065 return 1;
1066}
1067
Ben Lindstromb3921512001-04-11 15:57:50 +00001068/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001069static void
Ben Lindstromb3921512001-04-11 15:57:50 +00001070channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
1071{
1072 u_char *p;
1073 int have, ret;
1074
1075 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +10001076 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +00001077 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001078 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001079 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001080 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001081 /* need more */
1082 FD_SET(c->sock, readset);
1083 return;
1084 }
1085 /* try to guess the protocol */
1086 p = buffer_ptr(&c->input);
1087 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001088 case 0x04:
1089 ret = channel_decode_socks4(c, readset, writeset);
1090 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001091 case 0x05:
1092 ret = channel_decode_socks5(c, readset, writeset);
1093 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001094 default:
1095 ret = -1;
1096 break;
1097 }
1098 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001099 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001100 } else if (ret == 0) {
1101 debug2("channel %d: pre_dynamic: need more", c->self);
1102 /* need more */
1103 FD_SET(c->sock, readset);
1104 } else {
1105 /* switch to the next state */
1106 c->type = SSH_CHANNEL_OPENING;
1107 port_open_helper(c, "direct-tcpip");
1108 }
1109}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001110
Damien Millerb38eff82000-04-01 11:09:21 +10001111/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +00001112static void
Damien Millerb38eff82000-04-01 11:09:21 +10001113channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
1114{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001115 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001116 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001117 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001118 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001119 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001120 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001121
1122 if (FD_ISSET(c->sock, readset)) {
1123 debug("X11 connection requested.");
1124 addrlen = sizeof(addr);
1125 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001126 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001127 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001128 channel_close_fd(&c->sock);
1129 chan_mark_dead(c);
1130 }
Damien Millerb38eff82000-04-01 11:09:21 +10001131 if (newsock < 0) {
1132 error("accept: %.100s", strerror(errno));
1133 return;
1134 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001135 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001136 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001137 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001138 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001139 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001140
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001141 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001142 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001143 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001144 if (compat20) {
1145 packet_start(SSH2_MSG_CHANNEL_OPEN);
1146 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001147 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001148 packet_put_int(nc->local_window_max);
1149 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001150 /* originator ipaddr and port */
1151 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001152 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001153 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001154 } else {
1155 packet_put_int(remote_port);
1156 }
Damien Millerbd483e72000-04-30 10:00:53 +10001157 packet_send();
1158 } else {
1159 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001160 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001161 if (packet_get_protocol_flags() &
1162 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001163 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001164 packet_send();
1165 }
Damien Millerd83ff352001-01-30 09:19:34 +11001166 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001167 }
1168}
1169
Ben Lindstrombba81212001-06-25 05:01:22 +00001170static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001171port_open_helper(Channel *c, char *rtype)
1172{
1173 int direct;
1174 char buf[1024];
1175 char *remote_ipaddr = get_peer_ipaddr(c->sock);
1176 u_short remote_port = get_peer_port(c->sock);
1177
1178 direct = (strcmp(rtype, "direct-tcpip") == 0);
1179
1180 snprintf(buf, sizeof buf,
1181 "%s: listening port %d for %.100s port %d, "
1182 "connect from %.200s port %d",
1183 rtype, c->listening_port, c->path, c->host_port,
1184 remote_ipaddr, remote_port);
1185
1186 xfree(c->remote_name);
1187 c->remote_name = xstrdup(buf);
1188
1189 if (compat20) {
1190 packet_start(SSH2_MSG_CHANNEL_OPEN);
1191 packet_put_cstring(rtype);
1192 packet_put_int(c->self);
1193 packet_put_int(c->local_window_max);
1194 packet_put_int(c->local_maxpacket);
1195 if (direct) {
1196 /* target host, port */
1197 packet_put_cstring(c->path);
1198 packet_put_int(c->host_port);
1199 } else {
1200 /* listen address, port */
1201 packet_put_cstring(c->path);
1202 packet_put_int(c->listening_port);
1203 }
1204 /* originator host and port */
1205 packet_put_cstring(remote_ipaddr);
1206 packet_put_int(remote_port);
1207 packet_send();
1208 } else {
1209 packet_start(SSH_MSG_PORT_OPEN);
1210 packet_put_int(c->self);
1211 packet_put_cstring(c->path);
1212 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001213 if (packet_get_protocol_flags() &
1214 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001215 packet_put_cstring(c->remote_name);
1216 packet_send();
1217 }
1218 xfree(remote_ipaddr);
1219}
1220
Damien Millerb38eff82000-04-01 11:09:21 +10001221/*
1222 * This socket is listening for connections to a forwarded TCP/IP port.
1223 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001224static void
Damien Millerb38eff82000-04-01 11:09:21 +10001225channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1226{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001227 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001228 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001229 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001230 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001231 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001232
Damien Millerb38eff82000-04-01 11:09:21 +10001233 if (FD_ISSET(c->sock, readset)) {
1234 debug("Connection to port %d forwarding "
1235 "to %.100s port %d requested.",
1236 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001237
Damien Miller4623a752001-10-10 15:03:58 +10001238 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1239 nextstate = SSH_CHANNEL_OPENING;
1240 rtype = "forwarded-tcpip";
1241 } else {
1242 if (c->host_port == 0) {
1243 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001244 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001245 } else {
1246 nextstate = SSH_CHANNEL_OPENING;
1247 rtype = "direct-tcpip";
1248 }
1249 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001250
Damien Millerb38eff82000-04-01 11:09:21 +10001251 addrlen = sizeof(addr);
1252 newsock = accept(c->sock, &addr, &addrlen);
1253 if (newsock < 0) {
1254 error("accept: %.100s", strerror(errno));
1255 return;
1256 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001257 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001258 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1259 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001260 nc->listening_port = c->listening_port;
1261 nc->host_port = c->host_port;
1262 strlcpy(nc->path, c->path, sizeof(nc->path));
1263
Damien Miller4623a752001-10-10 15:03:58 +10001264 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1265 /*
1266 * do not call the channel_post handler until
1267 * this flag has been reset by a pre-handler.
1268 * otherwise the FD_ISSET calls might overflow
1269 */
1270 nc->delayed = 1;
1271 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001272 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001273 }
Damien Millerb38eff82000-04-01 11:09:21 +10001274 }
1275}
1276
1277/*
1278 * This is the authentication agent socket listening for connections from
1279 * clients.
1280 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001281static void
Damien Millerb38eff82000-04-01 11:09:21 +10001282channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1283{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001284 Channel *nc;
1285 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001286 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001287 socklen_t addrlen;
1288
1289 if (FD_ISSET(c->sock, readset)) {
1290 addrlen = sizeof(addr);
1291 newsock = accept(c->sock, &addr, &addrlen);
1292 if (newsock < 0) {
1293 error("accept from auth socket: %.100s", strerror(errno));
1294 return;
1295 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001296 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001297 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1298 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001299 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001300 if (compat20) {
1301 packet_start(SSH2_MSG_CHANNEL_OPEN);
1302 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001303 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001304 packet_put_int(c->local_window_max);
1305 packet_put_int(c->local_maxpacket);
1306 } else {
1307 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001308 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001309 }
Damien Millerb38eff82000-04-01 11:09:21 +10001310 packet_send();
1311 }
1312}
1313
Ben Lindstrombba81212001-06-25 05:01:22 +00001314static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001315channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1316{
Ben Lindstrom69128662001-05-08 20:07:39 +00001317 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001318 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001319
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001320 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001321 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001322 err = errno;
1323 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001324 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001325 if (err == 0) {
1326 debug("channel %d: connected", c->self);
1327 c->type = SSH_CHANNEL_OPEN;
1328 if (compat20) {
1329 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1330 packet_put_int(c->remote_id);
1331 packet_put_int(c->self);
1332 packet_put_int(c->local_window);
1333 packet_put_int(c->local_maxpacket);
1334 } else {
1335 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1336 packet_put_int(c->remote_id);
1337 packet_put_int(c->self);
1338 }
1339 } else {
1340 debug("channel %d: not connected: %s",
1341 c->self, strerror(err));
1342 if (compat20) {
1343 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1344 packet_put_int(c->remote_id);
1345 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1346 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1347 packet_put_cstring(strerror(err));
1348 packet_put_cstring("");
1349 }
1350 } else {
1351 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1352 packet_put_int(c->remote_id);
1353 }
1354 chan_mark_dead(c);
1355 }
1356 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001357 }
1358}
1359
Ben Lindstrombba81212001-06-25 05:01:22 +00001360static int
Damien Millerb38eff82000-04-01 11:09:21 +10001361channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1362{
1363 char buf[16*1024];
1364 int len;
1365
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001366 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001367 FD_ISSET(c->rfd, readset)) {
1368 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001369 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1370 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001371 if (len <= 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001372 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001373 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001374 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001375 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001376 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001377 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001378 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001379 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001380 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001381 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001382 } else {
1383 chan_read_failed(c);
1384 }
1385 return -1;
1386 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001387 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001388 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001389 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001390 chan_read_failed(c);
1391 }
1392 } else {
1393 buffer_append(&c->input, buf, len);
1394 }
Damien Millerb38eff82000-04-01 11:09:21 +10001395 }
1396 return 1;
1397}
Ben Lindstrombba81212001-06-25 05:01:22 +00001398static int
Damien Millerb38eff82000-04-01 11:09:21 +10001399channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1400{
Ben Lindstrome229b252001-03-05 06:28:06 +00001401 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001402 u_char *data;
1403 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001404 int len;
1405
1406 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001407 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001408 FD_ISSET(c->wfd, writeset) &&
1409 buffer_len(&c->output) > 0) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001410 data = buffer_ptr(&c->output);
1411 dlen = buffer_len(&c->output);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001412#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001413 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001414 if (compat20 && c->wfd_isatty)
1415 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001416#endif
Ben Lindstrombeb5f332002-07-22 15:28:53 +00001417 len = write(c->wfd, data, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001418 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1419 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001420 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001421 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001422 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001423 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001424 return -1;
1425 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001426 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001427 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001428 c->type = SSH_CHANNEL_INPUT_DRAINING;
1429 } else {
1430 chan_write_failed(c);
1431 }
1432 return -1;
1433 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001434 if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001435 if (tcgetattr(c->wfd, &tio) == 0 &&
1436 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1437 /*
1438 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001439 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001440 * size of a SSH2_MSG_CHANNEL_DATA message
1441 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +11001442 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001443 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001444 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001445 }
1446 }
Damien Millerb38eff82000-04-01 11:09:21 +10001447 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001448 if (compat20 && len > 0) {
1449 c->local_consumed += len;
1450 }
1451 }
1452 return 1;
1453}
Ben Lindstrombba81212001-06-25 05:01:22 +00001454static int
Damien Miller33b13562000-04-04 14:38:59 +10001455channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1456{
1457 char buf[16*1024];
1458 int len;
1459
Damien Miller1383bd82000-04-06 12:32:37 +10001460/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001461 if (c->efd != -1) {
1462 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1463 FD_ISSET(c->efd, writeset) &&
1464 buffer_len(&c->extended) > 0) {
1465 len = write(c->efd, buffer_ptr(&c->extended),
1466 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001467 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001468 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001469 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1470 return 1;
1471 if (len <= 0) {
1472 debug2("channel %d: closing write-efd %d",
1473 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001474 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001475 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001476 buffer_consume(&c->extended, len);
1477 c->local_consumed += len;
1478 }
1479 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1480 FD_ISSET(c->efd, readset)) {
1481 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001482 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001483 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001484 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1485 return 1;
1486 if (len <= 0) {
1487 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001488 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001489 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001490 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001491 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001492 }
Damien Miller33b13562000-04-04 14:38:59 +10001493 }
1494 }
1495 return 1;
1496}
Ben Lindstrombba81212001-06-25 05:01:22 +00001497static int
Damien Miller0e220db2004-06-15 10:34:08 +10001498channel_handle_ctl(Channel *c, fd_set * readset, fd_set * writeset)
1499{
1500 char buf[16];
1501 int len;
1502
1503 /* Monitor control fd to detect if the slave client exits */
1504 if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) {
1505 len = read(c->ctl_fd, buf, sizeof(buf));
1506 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1507 return 1;
1508 if (len <= 0) {
1509 debug2("channel %d: ctl read<=0", c->self);
1510 if (c->type != SSH_CHANNEL_OPEN) {
1511 debug2("channel %d: not open", c->self);
1512 chan_mark_dead(c);
1513 return -1;
1514 } else {
1515 chan_read_failed(c);
1516 chan_write_failed(c);
1517 }
1518 return -1;
1519 } else
1520 fatal("%s: unexpected data on ctl fd", __func__);
1521 }
1522 return 1;
1523}
1524static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001525channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001526{
Ben Lindstromb3921512001-04-11 15:57:50 +00001527 if (c->type == SSH_CHANNEL_OPEN &&
1528 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001529 c->local_window < c->local_window_max/2 &&
1530 c->local_consumed > 0) {
1531 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1532 packet_put_int(c->remote_id);
1533 packet_put_int(c->local_consumed);
1534 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001535 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001536 c->self, c->local_window,
1537 c->local_consumed);
1538 c->local_window += c->local_consumed;
1539 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001540 }
1541 return 1;
1542}
1543
Ben Lindstrombba81212001-06-25 05:01:22 +00001544static void
Damien Millerde6987c2002-01-22 23:20:40 +11001545channel_post_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001546{
Damien Miller4623a752001-10-10 15:03:58 +10001547 if (c->delayed)
1548 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001549 channel_handle_rfd(c, readset, writeset);
1550 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001551 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001552 return;
Damien Miller33b13562000-04-04 14:38:59 +10001553 channel_handle_efd(c, readset, writeset);
Damien Miller0e220db2004-06-15 10:34:08 +10001554 channel_handle_ctl(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001555 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001556}
1557
Ben Lindstrombba81212001-06-25 05:01:22 +00001558static void
Damien Millerb38eff82000-04-01 11:09:21 +10001559channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1560{
1561 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001562
Damien Millerb38eff82000-04-01 11:09:21 +10001563 /* Send buffered output data to the socket. */
1564 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1565 len = write(c->sock, buffer_ptr(&c->output),
1566 buffer_len(&c->output));
1567 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001568 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001569 else
1570 buffer_consume(&c->output, len);
1571 }
1572}
1573
Ben Lindstrombba81212001-06-25 05:01:22 +00001574static void
Damien Miller33b13562000-04-04 14:38:59 +10001575channel_handler_init_20(void)
1576{
Damien Millerde6987c2002-01-22 23:20:40 +11001577 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001578 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001579 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001580 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001581 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001582 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001583 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001584 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001585
Damien Millerde6987c2002-01-22 23:20:40 +11001586 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001587 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001588 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001589 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001590 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001591 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001592 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001593}
1594
Ben Lindstrombba81212001-06-25 05:01:22 +00001595static void
Damien Millerb38eff82000-04-01 11:09:21 +10001596channel_handler_init_13(void)
1597{
1598 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1599 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1600 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1601 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1602 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1603 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1604 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001605 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001606 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001607
Damien Millerde6987c2002-01-22 23:20:40 +11001608 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001609 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1610 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1611 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1612 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001613 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001614 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001615}
1616
Ben Lindstrombba81212001-06-25 05:01:22 +00001617static void
Damien Millerb38eff82000-04-01 11:09:21 +10001618channel_handler_init_15(void)
1619{
Damien Millerde6987c2002-01-22 23:20:40 +11001620 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001621 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001622 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1623 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1624 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001625 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001626 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001627
1628 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1629 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1630 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001631 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001632 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001633 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001634}
1635
Ben Lindstrombba81212001-06-25 05:01:22 +00001636static void
Damien Millerb38eff82000-04-01 11:09:21 +10001637channel_handler_init(void)
1638{
1639 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001640
Damien Miller9f0f5c62001-12-21 14:45:46 +11001641 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001642 channel_pre[i] = NULL;
1643 channel_post[i] = NULL;
1644 }
Damien Miller33b13562000-04-04 14:38:59 +10001645 if (compat20)
1646 channel_handler_init_20();
1647 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001648 channel_handler_init_13();
1649 else
1650 channel_handler_init_15();
1651}
1652
Damien Miller3ec27592001-10-12 11:35:04 +10001653/* gc dead channels */
1654static void
1655channel_garbage_collect(Channel *c)
1656{
1657 if (c == NULL)
1658 return;
1659 if (c->detach_user != NULL) {
1660 if (!chan_is_dead(c, 0))
1661 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001662 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001663 c->detach_user(c->self, NULL);
1664 /* if we still have a callback */
1665 if (c->detach_user != NULL)
1666 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001667 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001668 }
1669 if (!chan_is_dead(c, 1))
1670 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001671 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001672 channel_free(c);
1673}
1674
Ben Lindstrombba81212001-06-25 05:01:22 +00001675static void
Damien Millerb38eff82000-04-01 11:09:21 +10001676channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1677{
1678 static int did_init = 0;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001679 u_int i;
Damien Millerb38eff82000-04-01 11:09:21 +10001680 Channel *c;
1681
1682 if (!did_init) {
1683 channel_handler_init();
1684 did_init = 1;
1685 }
1686 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001687 c = channels[i];
1688 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001689 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001690 if (ftab[c->type] != NULL)
1691 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001692 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001693 }
1694}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001695
Ben Lindstrome9c99912001-06-09 00:41:05 +00001696/*
1697 * Allocate/update select bitmasks and add any bits relevant to channels in
1698 * select bitmasks.
1699 */
Damien Miller4af51302000-04-16 11:18:38 +10001700void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001701channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001702 u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001703{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001704 u_int n, sz;
Damien Miller5e953212001-01-30 09:14:00 +11001705
1706 n = MAX(*maxfdp, channel_max_fd);
1707
1708 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001709 /* perhaps check sz < nalloc/2 and shrink? */
1710 if (*readsetp == NULL || sz > *nallocp) {
1711 *readsetp = xrealloc(*readsetp, sz);
1712 *writesetp = xrealloc(*writesetp, sz);
1713 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001714 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001715 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001716 memset(*readsetp, 0, sz);
1717 memset(*writesetp, 0, sz);
1718
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001719 if (!rekeying)
1720 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001721}
1722
Ben Lindstrome9c99912001-06-09 00:41:05 +00001723/*
1724 * After select, perform any appropriate operations for channels which have
1725 * events pending.
1726 */
Damien Miller4af51302000-04-16 11:18:38 +10001727void
Damien Miller95def091999-11-25 00:26:21 +11001728channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001729{
Damien Millerb38eff82000-04-01 11:09:21 +10001730 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001731}
1732
Ben Lindstrome9c99912001-06-09 00:41:05 +00001733
Damien Miller5e953212001-01-30 09:14:00 +11001734/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001735
Damien Miller4af51302000-04-16 11:18:38 +10001736void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001737channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001738{
Damien Millerb38eff82000-04-01 11:09:21 +10001739 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001740 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001741
Damien Miller95def091999-11-25 00:26:21 +11001742 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001743 c = channels[i];
1744 if (c == NULL)
1745 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001746
Ben Lindstrome9c99912001-06-09 00:41:05 +00001747 /*
1748 * We are only interested in channels that can have buffered
1749 * incoming data.
1750 */
Damien Miller34132e52000-01-14 15:45:46 +11001751 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001752 if (c->type != SSH_CHANNEL_OPEN &&
1753 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001754 continue;
1755 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001756 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001757 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001758 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001759 if (compat20 &&
1760 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001761 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001762 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001763 continue;
1764 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001765
Damien Miller95def091999-11-25 00:26:21 +11001766 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001767 if ((c->istate == CHAN_INPUT_OPEN ||
1768 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1769 (len = buffer_len(&c->input)) > 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00001770 /*
1771 * Send some data for the other side over the secure
1772 * connection.
1773 */
Damien Miller33b13562000-04-04 14:38:59 +10001774 if (compat20) {
1775 if (len > c->remote_window)
1776 len = c->remote_window;
1777 if (len > c->remote_maxpacket)
1778 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001779 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001780 if (packet_is_interactive()) {
1781 if (len > 1024)
1782 len = 512;
1783 } else {
1784 /* Keep the packets at reasonable size. */
1785 if (len > packet_get_maxsize()/2)
1786 len = packet_get_maxsize()/2;
1787 }
Damien Miller95def091999-11-25 00:26:21 +11001788 }
Damien Millerb38eff82000-04-01 11:09:21 +10001789 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001790 packet_start(compat20 ?
1791 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001792 packet_put_int(c->remote_id);
1793 packet_put_string(buffer_ptr(&c->input), len);
1794 packet_send();
1795 buffer_consume(&c->input, len);
1796 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001797 }
1798 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001799 if (compat13)
1800 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001801 /*
1802 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001803 * tell peer, that we will not send more data: send IEOF.
1804 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001805 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001806 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Ben Lindstrom5a6abda2002-06-09 19:41:48 +00001807 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1808 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00001809 else
1810 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001811 }
Damien Miller33b13562000-04-04 14:38:59 +10001812 /* Send extended data, i.e. stderr */
1813 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001814 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001815 c->remote_window > 0 &&
1816 (len = buffer_len(&c->extended)) > 0 &&
1817 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001818 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001819 c->self, c->remote_window, buffer_len(&c->extended),
1820 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001821 if (len > c->remote_window)
1822 len = c->remote_window;
1823 if (len > c->remote_maxpacket)
1824 len = c->remote_maxpacket;
1825 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1826 packet_put_int(c->remote_id);
1827 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1828 packet_put_string(buffer_ptr(&c->extended), len);
1829 packet_send();
1830 buffer_consume(&c->extended, len);
1831 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001832 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001833 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001834 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001835}
1836
Ben Lindstrome9c99912001-06-09 00:41:05 +00001837
1838/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001839
Damien Miller4af51302000-04-16 11:18:38 +10001840void
Damien Miller630d6f42002-01-22 23:17:30 +11001841channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001842{
Damien Miller34132e52000-01-14 15:45:46 +11001843 int id;
Damien Miller95def091999-11-25 00:26:21 +11001844 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001845 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001846 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001847
Damien Miller95def091999-11-25 00:26:21 +11001848 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001849 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001850 c = channel_lookup(id);
1851 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001852 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001853
Damien Miller95def091999-11-25 00:26:21 +11001854 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001855 if (c->type != SSH_CHANNEL_OPEN &&
1856 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001857 return;
1858
Damien Miller95def091999-11-25 00:26:21 +11001859 /* Get the data. */
1860 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001861
Damien Millera04ad492004-01-21 11:02:09 +11001862 /*
1863 * Ignore data for protocol > 1.3 if output end is no longer open.
1864 * For protocol 2 the sending side is reducing its window as it sends
1865 * data, so we must 'fake' consumption of the data in order to ensure
1866 * that window updates are sent back. Otherwise the connection might
1867 * deadlock.
1868 */
1869 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
1870 if (compat20) {
1871 c->local_window -= data_len;
1872 c->local_consumed += data_len;
1873 }
1874 xfree(data);
1875 return;
1876 }
1877
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001878 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001879 if (data_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10001880 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller33b13562000-04-04 14:38:59 +10001881 c->self, data_len, c->local_maxpacket);
1882 }
1883 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10001884 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10001885 c->self, data_len, c->local_window);
1886 xfree(data);
1887 return;
1888 }
1889 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001890 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001891 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001892 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001893 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001894}
Ben Lindstrome9c99912001-06-09 00:41:05 +00001895
Damien Miller4af51302000-04-16 11:18:38 +10001896void
Damien Miller630d6f42002-01-22 23:17:30 +11001897channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001898{
1899 int id;
Damien Miller33b13562000-04-04 14:38:59 +10001900 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00001901 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10001902 Channel *c;
1903
1904 /* Get the channel number and verify it. */
1905 id = packet_get_int();
1906 c = channel_lookup(id);
1907
1908 if (c == NULL)
1909 packet_disconnect("Received extended_data for bad channel %d.", id);
1910 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10001911 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10001912 return;
1913 }
Ben Lindstromcf159442002-03-26 03:26:24 +00001914 if (c->flags & CHAN_EOF_RCVD) {
1915 if (datafellows & SSH_BUG_EXTEOF)
1916 debug("channel %d: accepting ext data after eof", id);
1917 else
1918 packet_disconnect("Received extended_data after EOF "
1919 "on channel %d.", id);
1920 }
Damien Miller33b13562000-04-04 14:38:59 +10001921 tcode = packet_get_int();
1922 if (c->efd == -1 ||
1923 c->extended_usage != CHAN_EXTENDED_WRITE ||
1924 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10001925 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001926 return;
1927 }
1928 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001929 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10001930 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10001931 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10001932 c->self, data_len, c->local_window);
1933 xfree(data);
1934 return;
1935 }
Damien Millerd3444942000-09-30 14:20:03 +11001936 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001937 c->local_window -= data_len;
1938 buffer_append(&c->extended, data, data_len);
1939 xfree(data);
1940}
1941
Damien Miller4af51302000-04-16 11:18:38 +10001942void
Damien Miller630d6f42002-01-22 23:17:30 +11001943channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001944{
1945 int id;
1946 Channel *c;
1947
Damien Millerb38eff82000-04-01 11:09:21 +10001948 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001949 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001950 c = channel_lookup(id);
1951 if (c == NULL)
1952 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1953 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001954
1955 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11001956 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001957 debug("channel %d: FORCE input drain", c->self);
1958 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11001959 if (buffer_len(&c->input) == 0)
1960 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001961 }
1962
Damien Millerb38eff82000-04-01 11:09:21 +10001963}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001964
Damien Miller4af51302000-04-16 11:18:38 +10001965void
Damien Miller630d6f42002-01-22 23:17:30 +11001966channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001967{
Damien Millerb38eff82000-04-01 11:09:21 +10001968 int id;
1969 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001970
Damien Millerb38eff82000-04-01 11:09:21 +10001971 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001972 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001973 c = channel_lookup(id);
1974 if (c == NULL)
1975 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001976
1977 /*
1978 * Send a confirmation that we have closed the channel and no more
1979 * data is coming for it.
1980 */
Damien Miller95def091999-11-25 00:26:21 +11001981 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001982 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001983 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001984
Damien Miller5428f641999-11-25 11:54:57 +11001985 /*
1986 * If the channel is in closed state, we have sent a close request,
1987 * and the other side will eventually respond with a confirmation.
1988 * Thus, we cannot free the channel here, because then there would be
1989 * no-one to receive the confirmation. The channel gets freed when
1990 * the confirmation arrives.
1991 */
Damien Millerb38eff82000-04-01 11:09:21 +10001992 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11001993 /*
1994 * Not a closed channel - mark it as draining, which will
1995 * cause it to be freed later.
1996 */
Damien Miller76765c02002-01-22 23:21:15 +11001997 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10001998 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11001999 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002000}
2001
Damien Millerb38eff82000-04-01 11:09:21 +10002002/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10002003void
Damien Miller630d6f42002-01-22 23:17:30 +11002004channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002005{
Damien Millerb38eff82000-04-01 11:09:21 +10002006 int id = packet_get_int();
2007 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002008
Damien Miller48b03fc2002-01-22 23:11:40 +11002009 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002010 if (c == NULL)
2011 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2012 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002013}
2014
Damien Miller4af51302000-04-16 11:18:38 +10002015void
Damien Miller630d6f42002-01-22 23:17:30 +11002016channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002017{
2018 int id = packet_get_int();
2019 Channel *c = channel_lookup(id);
2020
Damien Miller48b03fc2002-01-22 23:11:40 +11002021 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002022 if (c == NULL)
2023 packet_disconnect("Received close confirmation for "
2024 "out-of-range channel %d.", id);
2025 if (c->type != SSH_CHANNEL_CLOSED)
2026 packet_disconnect("Received close confirmation for "
2027 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002028 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002029}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002030
Damien Miller4af51302000-04-16 11:18:38 +10002031void
Damien Miller630d6f42002-01-22 23:17:30 +11002032channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002033{
Damien Millerb38eff82000-04-01 11:09:21 +10002034 int id, remote_id;
2035 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002036
Damien Millerb38eff82000-04-01 11:09:21 +10002037 id = packet_get_int();
2038 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002039
Damien Millerb38eff82000-04-01 11:09:21 +10002040 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2041 packet_disconnect("Received open confirmation for "
2042 "non-opening channel %d.", id);
2043 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002044 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002045 c->remote_id = remote_id;
2046 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002047
2048 if (compat20) {
2049 c->remote_window = packet_get_int();
2050 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11002051 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002052 debug2("callback start");
Damien Miller0e220db2004-06-15 10:34:08 +10002053 c->confirm(c->self, c->confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002054 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002055 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002056 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002057 c->remote_window, c->remote_maxpacket);
2058 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002059 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002060}
2061
Ben Lindstrombba81212001-06-25 05:01:22 +00002062static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002063reason2txt(int reason)
2064{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002065 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002066 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2067 return "administratively prohibited";
2068 case SSH2_OPEN_CONNECT_FAILED:
2069 return "connect failed";
2070 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2071 return "unknown channel type";
2072 case SSH2_OPEN_RESOURCE_SHORTAGE:
2073 return "resource shortage";
2074 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002075 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002076}
2077
Damien Miller4af51302000-04-16 11:18:38 +10002078void
Damien Miller630d6f42002-01-22 23:17:30 +11002079channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002080{
Kevin Steves12057502001-02-05 14:54:34 +00002081 int id, reason;
2082 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002083 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002084
Damien Millerb38eff82000-04-01 11:09:21 +10002085 id = packet_get_int();
2086 c = channel_lookup(id);
2087
2088 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2089 packet_disconnect("Received open failure for "
2090 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002091 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002092 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002093 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002094 msg = packet_get_string(NULL);
2095 lang = packet_get_string(NULL);
2096 }
Damien Miller996acd22003-04-09 20:59:48 +10002097 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002098 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002099 if (msg != NULL)
2100 xfree(msg);
2101 if (lang != NULL)
2102 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10002103 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002104 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11002105 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002106 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002107}
2108
Damien Miller33b13562000-04-04 14:38:59 +10002109void
Damien Miller630d6f42002-01-22 23:17:30 +11002110channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002111{
2112 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002113 int id;
2114 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002115
2116 if (!compat20)
2117 return;
2118
2119 /* Get the channel number and verify it. */
2120 id = packet_get_int();
2121 c = channel_lookup(id);
2122
2123 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002124 logit("Received window adjust for "
Damien Miller33b13562000-04-04 14:38:59 +10002125 "non-open channel %d.", id);
2126 return;
2127 }
2128 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002129 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002130 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002131 c->remote_window += adjust;
2132}
2133
Damien Miller4af51302000-04-16 11:18:38 +10002134void
Damien Miller630d6f42002-01-22 23:17:30 +11002135channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002136{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002137 Channel *c = NULL;
2138 u_short host_port;
2139 char *host, *originator_string;
2140 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002141
Ben Lindstrome9c99912001-06-09 00:41:05 +00002142 remote_id = packet_get_int();
2143 host = packet_get_string(NULL);
2144 host_port = packet_get_int();
2145
2146 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2147 originator_string = packet_get_string(NULL);
2148 } else {
2149 originator_string = xstrdup("unknown (remote did not supply name)");
2150 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002151 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002152 sock = channel_connect_to(host, host_port);
2153 if (sock != -1) {
2154 c = channel_new("connected socket",
2155 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2156 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002157 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002158 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002159 xfree(originator_string);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002160 if (c == NULL) {
2161 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2162 packet_put_int(remote_id);
2163 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002164 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002165 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002166}
2167
2168
Ben Lindstrome9c99912001-06-09 00:41:05 +00002169/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002170
Ben Lindstrom908afed2001-10-03 17:34:59 +00002171void
2172channel_set_af(int af)
2173{
2174 IPv4or6 = af;
2175}
2176
Damien Millerb16461c2002-01-22 23:29:22 +11002177static int
2178channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2179 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002180{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002181 Channel *c;
Damien Millerb16461c2002-01-22 23:29:22 +11002182 int success, sock, on = 1;
Damien Miller34132e52000-01-14 15:45:46 +11002183 struct addrinfo hints, *ai, *aitop;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002184 const char *host;
Damien Millerb16461c2002-01-22 23:29:22 +11002185 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002186
Kevin Steves12057502001-02-05 14:54:34 +00002187 success = 0;
Damien Millerb16461c2002-01-22 23:29:22 +11002188 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2189 listen_addr : host_to_connect;
Kevin Steves12057502001-02-05 14:54:34 +00002190
Damien Millerb16461c2002-01-22 23:29:22 +11002191 if (host == NULL) {
2192 error("No forward host name.");
2193 return success;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002194 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002195 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002196 error("Forward host name too long.");
2197 return success;
2198 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002199
Damien Miller5428f641999-11-25 11:54:57 +11002200 /*
Damien Miller34132e52000-01-14 15:45:46 +11002201 * getaddrinfo returns a loopback address if the hostname is
2202 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002203 */
Damien Miller34132e52000-01-14 15:45:46 +11002204 memset(&hints, 0, sizeof(hints));
2205 hints.ai_family = IPv4or6;
2206 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
2207 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002208 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002209 if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
2210 packet_disconnect("getaddrinfo: fatal error");
Damien Miller5428f641999-11-25 11:54:57 +11002211
Damien Miller34132e52000-01-14 15:45:46 +11002212 for (ai = aitop; ai; ai = ai->ai_next) {
2213 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2214 continue;
2215 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2216 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002217 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002218 continue;
2219 }
2220 /* Create a port to listen for the host. */
Damien Miller2372ace2003-05-14 13:42:23 +10002221 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002222 if (sock < 0) {
2223 /* this is no error since kernel may not support ipv6 */
2224 verbose("socket: %.100s", strerror(errno));
2225 continue;
2226 }
2227 /*
Damien Millere1383ce2002-09-19 11:49:37 +10002228 * Set socket options.
2229 * Allow local port reuse in TIME_WAIT.
Damien Miller34132e52000-01-14 15:45:46 +11002230 */
Damien Millere1383ce2002-09-19 11:49:37 +10002231 if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on,
2232 sizeof(on)) == -1)
2233 error("setsockopt SO_REUSEADDR: %s", strerror(errno));
2234
Damien Miller34132e52000-01-14 15:45:46 +11002235 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002236
Damien Miller34132e52000-01-14 15:45:46 +11002237 /* Bind the socket to the address. */
2238 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2239 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002240 if (!ai->ai_next)
2241 error("bind: %.100s", strerror(errno));
2242 else
2243 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002244
Damien Miller34132e52000-01-14 15:45:46 +11002245 close(sock);
2246 continue;
2247 }
2248 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002249 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002250 error("listen: %.100s", strerror(errno));
2251 close(sock);
2252 continue;
2253 }
2254 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002255 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002256 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002257 0, "port listener", 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002258 strlcpy(c->path, host, sizeof(c->path));
2259 c->host_port = port_to_connect;
2260 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002261 success = 1;
2262 }
2263 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002264 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002265 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002266 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002267 return success;
Damien Miller95def091999-11-25 00:26:21 +11002268}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002269
Darren Tuckere7066df2004-05-24 10:18:05 +10002270int
2271channel_cancel_rport_listener(const char *host, u_short port)
2272{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002273 u_int i;
2274 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002275
2276 for(i = 0; i < channels_alloc; i++) {
2277 Channel *c = channels[i];
2278
2279 if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
2280 strncmp(c->path, host, sizeof(c->path)) == 0 &&
Darren Tuckerfc959702004-07-17 16:12:08 +10002281 c->listening_port == port) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002282 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002283 channel_free(c);
2284 found = 1;
2285 }
2286 }
2287
2288 return (found);
2289}
2290
Damien Millerb16461c2002-01-22 23:29:22 +11002291/* protocol local port fwd, used by ssh (and sshd in v1) */
2292int
2293channel_setup_local_fwd_listener(u_short listen_port,
2294 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2295{
2296 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
2297 NULL, listen_port, host_to_connect, port_to_connect, gateway_ports);
2298}
2299
2300/* protocol v2 remote port fwd, used by sshd */
2301int
2302channel_setup_remote_fwd_listener(const char *listen_address,
2303 u_short listen_port, int gateway_ports)
2304{
2305 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2306 listen_address, listen_port, NULL, 0, gateway_ports);
2307}
2308
Damien Miller5428f641999-11-25 11:54:57 +11002309/*
2310 * Initiate forwarding of connections to port "port" on remote host through
2311 * the secure channel to host:port from local side.
2312 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002313
Damien Miller4af51302000-04-16 11:18:38 +10002314void
Damien Miller0bc1bd82000-11-13 22:57:25 +11002315channel_request_remote_forwarding(u_short listen_port,
2316 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002317{
Damien Millerdff50992002-01-22 23:16:32 +11002318 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002319
Damien Miller95def091999-11-25 00:26:21 +11002320 /* Record locally that connection to this host/port is permitted. */
2321 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2322 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002323
Damien Miller95def091999-11-25 00:26:21 +11002324 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002325 if (compat20) {
2326 const char *address_to_bind = "0.0.0.0";
2327 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2328 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002329 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002330 packet_put_cstring(address_to_bind);
2331 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002332 packet_send();
2333 packet_write_wait();
2334 /* Assume that server accepts the request */
2335 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002336 } else {
2337 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002338 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002339 packet_put_cstring(host_to_connect);
2340 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002341 packet_send();
2342 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002343
2344 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002345 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002346 switch (type) {
2347 case SSH_SMSG_SUCCESS:
2348 success = 1;
2349 break;
2350 case SSH_SMSG_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +10002351 logit("Warning: Server denied remote port forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11002352 break;
2353 default:
2354 /* Unknown packet */
2355 packet_disconnect("Protocol error for port forward request:"
2356 "received packet type %d.", type);
2357 }
2358 }
2359 if (success) {
2360 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2361 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2362 permitted_opens[num_permitted_opens].listen_port = listen_port;
2363 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002364 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002365}
2366
Damien Miller5428f641999-11-25 11:54:57 +11002367/*
Darren Tuckerfc959702004-07-17 16:12:08 +10002368 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10002369 * local side.
2370 */
Darren Tuckere7066df2004-05-24 10:18:05 +10002371void
2372channel_request_rforward_cancel(u_short port)
2373{
2374 int i;
2375 const char *address_to_bind = "0.0.0.0";
2376
2377 if (!compat20)
2378 return;
2379
2380 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10002381 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10002382 permitted_opens[i].listen_port == port)
2383 break;
2384 }
2385 if (i >= num_permitted_opens) {
2386 debug("%s: requested forward not found", __func__);
2387 return;
2388 }
2389 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2390 packet_put_cstring("cancel-tcpip-forward");
2391 packet_put_char(0);
2392 packet_put_cstring(address_to_bind);
2393 packet_put_int(port);
2394 packet_send();
2395
2396 permitted_opens[i].listen_port = 0;
2397 permitted_opens[i].port_to_connect = 0;
2398 free(permitted_opens[i].host_to_connect);
2399 permitted_opens[i].host_to_connect = NULL;
2400}
2401
2402/*
Damien Miller5428f641999-11-25 11:54:57 +11002403 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2404 * listening for the port, and sends back a success reply (or disconnect
2405 * message if there was an error). This never returns if there was an error.
2406 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002407
Damien Miller4af51302000-04-16 11:18:38 +10002408void
Damien Millere247cc42000-05-07 12:03:14 +10002409channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002410{
Damien Milleraae6c611999-12-06 11:47:28 +11002411 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002412 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002413
Damien Miller95def091999-11-25 00:26:21 +11002414 /* Get arguments from the packet. */
2415 port = packet_get_int();
2416 hostname = packet_get_string(NULL);
2417 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002418
Damien Millerbac2d8a2000-09-05 16:13:06 +11002419#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002420 /*
2421 * Check that an unprivileged user is not trying to forward a
2422 * privileged port.
2423 */
Damien Miller95def091999-11-25 00:26:21 +11002424 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10002425 packet_disconnect(
2426 "Requested forwarding of port %d but user is not root.",
2427 port);
2428 if (host_port == 0)
2429 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11002430#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10002431
Damien Miller0bc1bd82000-11-13 22:57:25 +11002432 /* Initiate forwarding */
Damien Millerb16461c2002-01-22 23:29:22 +11002433 channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002434
2435 /* Free the argument string. */
2436 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002437}
2438
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002439/*
2440 * Permits opening to any host/port if permitted_opens[] is empty. This is
2441 * usually called by the server, because the user could connect to any port
2442 * anyway, and the server has no way to know but to trust the client anyway.
2443 */
2444void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002445channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002446{
2447 if (num_permitted_opens == 0)
2448 all_opens_permitted = 1;
2449}
2450
Ben Lindstroma3700052001-04-05 23:26:32 +00002451void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002452channel_add_permitted_opens(char *host, int port)
2453{
2454 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2455 fatal("channel_request_remote_forwarding: too many forwards");
2456 debug("allow port forwarding to host %s port %d", host, port);
2457
2458 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2459 permitted_opens[num_permitted_opens].port_to_connect = port;
2460 num_permitted_opens++;
2461
2462 all_opens_permitted = 0;
2463}
2464
Ben Lindstroma3700052001-04-05 23:26:32 +00002465void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002466channel_clear_permitted_opens(void)
2467{
2468 int i;
2469
2470 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002471 if (permitted_opens[i].host_to_connect != NULL)
2472 xfree(permitted_opens[i].host_to_connect);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002473 num_permitted_opens = 0;
2474
2475}
2476
2477
2478/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002479static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002480connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002481{
Damien Miller34132e52000-01-14 15:45:46 +11002482 struct addrinfo hints, *ai, *aitop;
2483 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2484 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002485 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002486
Damien Miller34132e52000-01-14 15:45:46 +11002487 memset(&hints, 0, sizeof(hints));
2488 hints.ai_family = IPv4or6;
2489 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002490 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002491 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002492 error("connect_to %.100s: unknown host (%s)", host,
2493 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002494 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002495 }
Damien Miller34132e52000-01-14 15:45:46 +11002496 for (ai = aitop; ai; ai = ai->ai_next) {
2497 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2498 continue;
2499 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2500 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002501 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002502 continue;
2503 }
Damien Miller2372ace2003-05-14 13:42:23 +10002504 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002505 if (sock < 0) {
Damien Millerb46b9f32003-01-10 21:45:12 +11002506 if (ai->ai_next == NULL)
2507 error("socket: %.100s", strerror(errno));
2508 else
2509 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002510 continue;
2511 }
Damien Miller232711f2004-06-15 10:35:30 +10002512 if (set_nonblock(sock) == -1)
2513 fatal("%s: set_nonblock(%d)", __func__, sock);
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002514 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2515 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002516 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002517 strerror(errno));
2518 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002519 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002520 }
2521 break; /* success */
2522
2523 }
2524 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002525 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002526 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002527 return -1;
2528 }
2529 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002530 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002531 return sock;
2532}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002533
Damien Miller0bc1bd82000-11-13 22:57:25 +11002534int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002535channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002536{
2537 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002538
Damien Miller0bc1bd82000-11-13 22:57:25 +11002539 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002540 if (permitted_opens[i].host_to_connect != NULL &&
2541 permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002542 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002543 permitted_opens[i].host_to_connect,
2544 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002545 error("WARNING: Server requests forwarding for unknown listen_port %d",
2546 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002547 return -1;
2548}
Damien Millerb38eff82000-04-01 11:09:21 +10002549
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002550/* Check if connecting to that port is permitted and connect. */
2551int
2552channel_connect_to(const char *host, u_short port)
2553{
2554 int i, permit;
2555
2556 permit = all_opens_permitted;
2557 if (!permit) {
2558 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002559 if (permitted_opens[i].host_to_connect != NULL &&
2560 permitted_opens[i].port_to_connect == port &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002561 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2562 permit = 1;
2563
2564 }
2565 if (!permit) {
Damien Miller996acd22003-04-09 20:59:48 +10002566 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002567 "but the request was denied.", host, port);
2568 return -1;
2569 }
2570 return connect_to(host, port);
2571}
2572
Damien Miller0e220db2004-06-15 10:34:08 +10002573void
2574channel_send_window_changes(void)
2575{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002576 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10002577 struct winsize ws;
2578
2579 for (i = 0; i < channels_alloc; i++) {
Darren Tucker5d78de62004-11-05 20:35:44 +11002580 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10002581 channels[i]->type != SSH_CHANNEL_OPEN)
2582 continue;
2583 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
2584 continue;
2585 channel_request_start(i, "window-change", 0);
2586 packet_put_int(ws.ws_col);
2587 packet_put_int(ws.ws_row);
2588 packet_put_int(ws.ws_xpixel);
2589 packet_put_int(ws.ws_ypixel);
2590 packet_send();
2591 }
2592}
2593
Ben Lindstrome9c99912001-06-09 00:41:05 +00002594/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002595
Damien Miller5428f641999-11-25 11:54:57 +11002596/*
2597 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002598 * Returns 0 and a suitable display number for the DISPLAY variable
2599 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002600 */
Kevin Steves366298c2001-12-19 17:58:01 +00002601int
Damien Miller95c249f2002-02-05 12:11:34 +11002602x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002603 int single_connection, u_int *display_numberp)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002604{
Damien Millere7378562001-12-21 14:58:35 +11002605 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002606 int display_number, sock;
2607 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002608 struct addrinfo hints, *ai, *aitop;
2609 char strport[NI_MAXSERV];
2610 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002611
Damien Millera34a28b1999-12-14 10:47:15 +11002612 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002613 display_number < MAX_DISPLAYS;
2614 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002615 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002616 memset(&hints, 0, sizeof(hints));
2617 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002618 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002619 hints.ai_socktype = SOCK_STREAM;
2620 snprintf(strport, sizeof strport, "%d", port);
2621 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2622 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002623 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002624 }
Damien Miller34132e52000-01-14 15:45:46 +11002625 for (ai = aitop; ai; ai = ai->ai_next) {
2626 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2627 continue;
Damien Miller2372ace2003-05-14 13:42:23 +10002628 sock = socket(ai->ai_family, ai->ai_socktype,
2629 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002630 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002631 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002632 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10002633 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00002634 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002635 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002636 debug("x11_create_display_inet: Socket family %d not supported",
2637 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002638 continue;
2639 }
Damien Miller34132e52000-01-14 15:45:46 +11002640 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002641#ifdef IPV6_V6ONLY
2642 if (ai->ai_family == AF_INET6) {
2643 int on = 1;
2644 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2645 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2646 }
2647#endif
Damien Miller34132e52000-01-14 15:45:46 +11002648 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002649 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002650 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002651
2652 if (ai->ai_next)
2653 continue;
2654
Damien Miller34132e52000-01-14 15:45:46 +11002655 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002656 close(socks[n]);
2657 }
2658 num_socks = 0;
2659 break;
2660 }
2661 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002662#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002663 if (num_socks == NUM_SOCKS)
2664 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002665#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002666 if (x11_use_localhost) {
2667 if (num_socks == NUM_SOCKS)
2668 break;
2669 } else {
2670 break;
2671 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002672#endif
Damien Miller95def091999-11-25 00:26:21 +11002673 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002674 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002675 if (num_socks > 0)
2676 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002677 }
Damien Miller95def091999-11-25 00:26:21 +11002678 if (display_number >= MAX_DISPLAYS) {
2679 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002680 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002681 }
Damien Miller95def091999-11-25 00:26:21 +11002682 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002683 for (n = 0; n < num_socks; n++) {
2684 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11002685 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002686 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002687 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002688 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002689 }
Damien Miller95def091999-11-25 00:26:21 +11002690 }
Damien Miller34132e52000-01-14 15:45:46 +11002691
Damien Miller34132e52000-01-14 15:45:46 +11002692 /* Allocate a channel for each socket. */
2693 for (n = 0; n < num_socks; n++) {
2694 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002695 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002696 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2697 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002698 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11002699 nc->single_connection = single_connection;
Damien Miller34132e52000-01-14 15:45:46 +11002700 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002701
Kevin Steves366298c2001-12-19 17:58:01 +00002702 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002703 *display_numberp = display_number;
2704 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002705}
2706
Ben Lindstrombba81212001-06-25 05:01:22 +00002707static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002708connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002709{
Damien Miller95def091999-11-25 00:26:21 +11002710 int sock;
2711 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002712
Damien Miller3afe3752001-12-21 12:39:51 +11002713 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2714 if (sock < 0)
2715 error("socket: %.100s", strerror(errno));
2716 memset(&addr, 0, sizeof(addr));
2717 addr.sun_family = AF_UNIX;
2718 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
2719 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2720 return sock;
2721 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002722 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2723 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002724}
2725
Damien Millerbd483e72000-04-30 10:00:53 +10002726int
2727x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002728{
Damien Miller398e1cf2002-02-05 11:52:13 +11002729 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002730 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002731 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002732 struct addrinfo hints, *ai, *aitop;
2733 char strport[NI_MAXSERV];
2734 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002735
Damien Miller95def091999-11-25 00:26:21 +11002736 /* Try to open a socket for the local X server. */
2737 display = getenv("DISPLAY");
2738 if (!display) {
2739 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002740 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002741 }
Damien Miller5428f641999-11-25 11:54:57 +11002742 /*
2743 * Now we decode the value of the DISPLAY variable and make a
2744 * connection to the real X server.
2745 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002746
Damien Miller5428f641999-11-25 11:54:57 +11002747 /*
2748 * Check if it is a unix domain socket. Unix domain displays are in
2749 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2750 */
Damien Miller95def091999-11-25 00:26:21 +11002751 if (strncmp(display, "unix:", 5) == 0 ||
2752 display[0] == ':') {
2753 /* Connect to the unix domain socket. */
2754 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2755 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002756 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002757 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002758 }
2759 /* Create a socket. */
2760 sock = connect_local_xsocket(display_number);
2761 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002762 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002763
2764 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002765 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002766 }
Damien Miller5428f641999-11-25 11:54:57 +11002767 /*
2768 * Connect to an inet socket. The DISPLAY value is supposedly
2769 * hostname:d[.s], where hostname may also be numeric IP address.
2770 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002771 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002772 cp = strchr(buf, ':');
2773 if (!cp) {
2774 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002775 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002776 }
Damien Miller95def091999-11-25 00:26:21 +11002777 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002778 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002779 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2780 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002781 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002782 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002783 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002784
Damien Miller34132e52000-01-14 15:45:46 +11002785 /* Look up the host address */
2786 memset(&hints, 0, sizeof(hints));
2787 hints.ai_family = IPv4or6;
2788 hints.ai_socktype = SOCK_STREAM;
2789 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2790 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2791 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002792 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002793 }
Damien Miller34132e52000-01-14 15:45:46 +11002794 for (ai = aitop; ai; ai = ai->ai_next) {
2795 /* Create a socket. */
Damien Miller2372ace2003-05-14 13:42:23 +10002796 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002797 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002798 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002799 continue;
2800 }
2801 /* Connect it to the display. */
2802 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002803 debug2("connect %.100s port %d: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10002804 6000 + display_number, strerror(errno));
2805 close(sock);
2806 continue;
2807 }
2808 /* Success */
2809 break;
Damien Miller34132e52000-01-14 15:45:46 +11002810 }
Damien Miller34132e52000-01-14 15:45:46 +11002811 freeaddrinfo(aitop);
2812 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002813 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002814 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002815 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002816 }
Damien Miller398e1cf2002-02-05 11:52:13 +11002817 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10002818 return sock;
2819}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002820
Damien Millerbd483e72000-04-30 10:00:53 +10002821/*
2822 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2823 * the remote channel number. We should do whatever we want, and respond
2824 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2825 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002826
Damien Millerbd483e72000-04-30 10:00:53 +10002827void
Damien Miller630d6f42002-01-22 23:17:30 +11002828x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002829{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002830 Channel *c = NULL;
2831 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002832 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002833
2834 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002835
2836 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002837
2838 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002839 remote_host = packet_get_string(NULL);
2840 } else {
2841 remote_host = xstrdup("unknown (remote did not supply name)");
2842 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002843 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10002844
2845 /* Obtain a connection to the real X display. */
2846 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002847 if (sock != -1) {
2848 /* Allocate a channel for this connection. */
2849 c = channel_new("connected x11 socket",
2850 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2851 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002852 c->remote_id = remote_id;
2853 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002854 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002855 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002856 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002857 /* Send refusal to the remote host. */
2858 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002859 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10002860 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10002861 /* Send a confirmation to the remote host. */
2862 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002863 packet_put_int(remote_id);
2864 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10002865 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002866 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002867}
2868
Damien Miller69b69aa2000-10-28 14:19:58 +11002869/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2870void
Damien Miller630d6f42002-01-22 23:17:30 +11002871deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11002872{
2873 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002874
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002875 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11002876 case SSH_SMSG_AGENT_OPEN:
2877 error("Warning: ssh server tried agent forwarding.");
2878 break;
2879 case SSH_SMSG_X11_OPEN:
2880 error("Warning: ssh server tried X11 forwarding.");
2881 break;
2882 default:
Damien Miller630d6f42002-01-22 23:17:30 +11002883 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11002884 break;
2885 }
2886 error("Warning: this is probably a break in attempt by a malicious server.");
2887 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2888 packet_put_int(rchan);
2889 packet_send();
2890}
2891
Damien Miller5428f641999-11-25 11:54:57 +11002892/*
2893 * Requests forwarding of X11 connections, generates fake authentication
2894 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00002895 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11002896 */
Damien Miller4af51302000-04-16 11:18:38 +10002897void
Damien Millerbd483e72000-04-30 10:00:53 +10002898x11_request_forwarding_with_spoofing(int client_session_id,
2899 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002900{
Ben Lindstrom46c16222000-12-22 01:43:59 +00002901 u_int data_len = (u_int) strlen(data) / 2;
Ben Lindstromb3211a82001-02-10 22:33:19 +00002902 u_int i, value, len;
Damien Miller95def091999-11-25 00:26:21 +11002903 char *new_data;
2904 int screen_number;
2905 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002906 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002907
Damien Miller95def091999-11-25 00:26:21 +11002908 cp = getenv("DISPLAY");
2909 if (cp)
2910 cp = strchr(cp, ':');
2911 if (cp)
2912 cp = strchr(cp, '.');
2913 if (cp)
2914 screen_number = atoi(cp + 1);
2915 else
2916 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002917
Damien Miller95def091999-11-25 00:26:21 +11002918 /* Save protocol name. */
2919 x11_saved_proto = xstrdup(proto);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002920
Damien Miller5428f641999-11-25 11:54:57 +11002921 /*
2922 * Extract real authentication data and generate fake data of the
2923 * same length.
2924 */
Damien Miller95def091999-11-25 00:26:21 +11002925 x11_saved_data = xmalloc(data_len);
2926 x11_fake_data = xmalloc(data_len);
2927 for (i = 0; i < data_len; i++) {
2928 if (sscanf(data + 2 * i, "%2x", &value) != 1)
2929 fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2930 if (i % 4 == 0)
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002931 rnd = arc4random();
Damien Miller95def091999-11-25 00:26:21 +11002932 x11_saved_data[i] = value;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10002933 x11_fake_data[i] = rnd & 0xff;
2934 rnd >>= 8;
Damien Miller95def091999-11-25 00:26:21 +11002935 }
2936 x11_saved_data_len = data_len;
2937 x11_fake_data_len = data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002938
Damien Miller95def091999-11-25 00:26:21 +11002939 /* Convert the fake data into hex. */
Ben Lindstromb3211a82001-02-10 22:33:19 +00002940 len = 2 * data_len + 1;
2941 new_data = xmalloc(len);
Damien Miller95def091999-11-25 00:26:21 +11002942 for (i = 0; i < data_len; i++)
Ben Lindstromb3211a82001-02-10 22:33:19 +00002943 snprintf(new_data + 2 * i, len - 2 * i,
2944 "%02x", (u_char) x11_fake_data[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002945
Damien Miller95def091999-11-25 00:26:21 +11002946 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10002947 if (compat20) {
2948 channel_request_start(client_session_id, "x11-req", 0);
2949 packet_put_char(0); /* XXX bool single connection */
2950 } else {
2951 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2952 }
2953 packet_put_cstring(proto);
2954 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11002955 packet_put_int(screen_number);
2956 packet_send();
2957 packet_write_wait();
2958 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002959}
2960
Ben Lindstrome9c99912001-06-09 00:41:05 +00002961
2962/* -- agent forwarding */
2963
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002964/* Sends a message to the server to request authentication fd forwarding. */
2965
Damien Miller4af51302000-04-16 11:18:38 +10002966void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002967auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002968{
Damien Miller95def091999-11-25 00:26:21 +11002969 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2970 packet_send();
2971 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002972}