blob: 04efd7287f7ea5e6aaa82f5711a673893d573cfe [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.
Ben Lindstrom44697232001-07-04 03:32:30 +000016 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110017 * Copyright (c) 1999 Dug Song. All rights reserved.
18 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110039 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41#include "includes.h"
Damien Miller52b77be2001-10-10 15:14:37 +100042RCSID("$OpenBSD: channels.c,v 1.139 2001/10/09 21:59:41 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100043
44#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000045#include "ssh1.h"
46#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100047#include "packet.h"
48#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100049#include "uidswap.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000050#include "log.h"
51#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100052#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100053#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000054#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100055#include "key.h"
56#include "authfd.h"
57
Damien Millerd4a8b7e1999-10-27 13:42:43 +100058
Ben Lindstrome9c99912001-06-09 00:41:05 +000059/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100060
Damien Miller5428f641999-11-25 11:54:57 +110061/*
62 * Pointer to an array containing all allocated channels. The array is
63 * dynamically extended as needed.
64 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000065static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100066
Damien Miller5428f641999-11-25 11:54:57 +110067/*
68 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000069 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110070 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100071static int channels_alloc = 0;
72
Damien Miller5428f641999-11-25 11:54:57 +110073/*
74 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000075 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110076 */
Damien Miller5e953212001-01-30 09:14:00 +110077static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100078
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079
Ben Lindstrome9c99912001-06-09 00:41:05 +000080/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081
Damien Miller5428f641999-11-25 11:54:57 +110082/*
83 * Data structure for storing which hosts are permitted for forward requests.
84 * The local sides of any remote forwards are stored in this array to prevent
85 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
86 * network (which might be behind a firewall).
87 */
Damien Miller95def091999-11-25 00:26:21 +110088typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +100089 char *host_to_connect; /* Connect to 'host'. */
90 u_short port_to_connect; /* Connect to 'port'. */
91 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092} ForwardPermission;
93
94/* List of all permitted host/port pairs to connect. */
95static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +000096
Damien Millerd4a8b7e1999-10-27 13:42:43 +100097/* Number of permitted host/port pairs in the array. */
98static int num_permitted_opens = 0;
Damien Miller5428f641999-11-25 11:54:57 +110099/*
100 * If this is true, all opens are permitted. This is the case on the server
101 * on which we have to trust the client anyway, and the user could do
102 * anything after logging in anyway.
103 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104static int all_opens_permitted = 0;
105
Ben Lindstrome9c99912001-06-09 00:41:05 +0000106
107/* -- X11 forwarding */
108
109/* Maximum number of fake X11 displays to try. */
110#define MAX_DISPLAYS 1000
111
112/* Saved X11 authentication protocol name. */
113static char *x11_saved_proto = NULL;
114
115/* Saved X11 authentication data. This is the real data. */
116static char *x11_saved_data = NULL;
117static u_int x11_saved_data_len = 0;
118
119/*
120 * Fake X11 authentication data. This is what the server will be sending us;
121 * we should replace any occurrences of this by the real data.
122 */
123static char *x11_fake_data = NULL;
124static u_int x11_fake_data_len;
125
126
127/* -- agent forwarding */
128
129#define NUM_SOCKS 10
130
131/* Name and directory of socket for authentication agent forwarding. */
132static char *auth_sock_name = NULL;
133static char *auth_sock_dir = NULL;
134
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000135/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000136static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000137
Ben Lindstrome9c99912001-06-09 00:41:05 +0000138/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000139static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000140
Ben Lindstrome9c99912001-06-09 00:41:05 +0000141/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000142
143Channel *
144channel_lookup(int id)
145{
146 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000147
Damien Millerc0fd17f2000-06-26 10:22:53 +1000148 if (id < 0 || id > channels_alloc) {
Damien Millerb38eff82000-04-01 11:09:21 +1000149 log("channel_lookup: %d: bad id", id);
150 return NULL;
151 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000152 c = channels[id];
153 if (c == NULL) {
Damien Millerb38eff82000-04-01 11:09:21 +1000154 log("channel_lookup: %d: bad id: channel free", id);
155 return NULL;
156 }
157 return c;
158}
159
Damien Miller5428f641999-11-25 11:54:57 +1100160/*
Damien Millere247cc42000-05-07 12:03:14 +1000161 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000162 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100163 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000164
Ben Lindstrombba81212001-06-25 05:01:22 +0000165static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100166channel_register_fds(Channel *c, int rfd, int wfd, int efd,
167 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000168{
Damien Miller95def091999-11-25 00:26:21 +1100169 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100170 channel_max_fd = MAX(channel_max_fd, rfd);
171 channel_max_fd = MAX(channel_max_fd, wfd);
172 channel_max_fd = MAX(channel_max_fd, efd);
173
Damien Miller5428f641999-11-25 11:54:57 +1100174 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000175
Damien Miller6f83b8e2000-05-02 09:23:45 +1000176 c->rfd = rfd;
177 c->wfd = wfd;
178 c->sock = (rfd == wfd) ? rfd : -1;
179 c->efd = efd;
180 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100181
Damien Miller79438cc2001-02-16 12:34:57 +1100182 /* XXX ugly hack: nonblock is only set by the server */
183 if (nonblock && isatty(c->rfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000184 debug("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100185 c->isatty = 1;
186 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000187 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100188 c->self, c->wfd);
189 }
190 } else {
191 c->isatty = 0;
192 }
193
Damien Miller69b69aa2000-10-28 14:19:58 +1100194 /* enable nonblocking mode */
195 if (nonblock) {
196 if (rfd != -1)
197 set_nonblock(rfd);
198 if (wfd != -1)
199 set_nonblock(wfd);
200 if (efd != -1)
201 set_nonblock(efd);
202 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000203}
204
205/*
206 * Allocate a new channel object and set its type and socket. This will cause
207 * remote_name to be freed.
208 */
209
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000210Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000211channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Damien Miller69b69aa2000-10-28 14:19:58 +1100212 int window, int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000213{
214 int i, found;
215 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000216
Damien Miller95def091999-11-25 00:26:21 +1100217 /* Do initial allocation if this is the first call. */
218 if (channels_alloc == 0) {
Damien Miller33b13562000-04-04 14:38:59 +1000219 chan_init();
Damien Miller95def091999-11-25 00:26:21 +1100220 channels_alloc = 10;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000221 channels = xmalloc(channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100222 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000223 channels[i] = NULL;
Ben Lindstrom601e4362001-06-21 03:19:23 +0000224 fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100225 }
226 /* Try to find a free slot where to put the new channel. */
227 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000228 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100229 /* Found a free slot. */
230 found = i;
231 break;
232 }
233 if (found == -1) {
Damien Miller5428f641999-11-25 11:54:57 +1100234 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100235 found = channels_alloc;
236 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100237 debug2("channel: expanding %d", channels_alloc);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000238 channels = xrealloc(channels, channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100239 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000240 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100241 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000242 /* Initialize and return new channel. */
243 c = channels[found] = xmalloc(sizeof(Channel));
Damien Miller4623a752001-10-10 15:03:58 +1000244 memset(c, 0, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100245 buffer_init(&c->input);
246 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000247 buffer_init(&c->extended);
Damien Miller95def091999-11-25 00:26:21 +1100248 chan_init_iostates(c);
Damien Miller69b69aa2000-10-28 14:19:58 +1100249 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100250 c->self = found;
251 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000252 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000253 c->local_window = window;
254 c->local_window_max = window;
255 c->local_consumed = 0;
256 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100257 c->remote_id = -1;
258 c->remote_name = remote_name;
Damien Millerb38eff82000-04-01 11:09:21 +1000259 c->remote_window = 0;
260 c->remote_maxpacket = 0;
261 c->cb_fn = NULL;
262 c->cb_arg = NULL;
263 c->cb_event = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000264 c->force_drain = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000265 c->detach_user = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000266 c->input_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100267 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000268 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000269}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000270
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000271static int
272channel_find_maxfd(void)
273{
274 int i, max = 0;
275 Channel *c;
276
277 for (i = 0; i < channels_alloc; i++) {
278 c = channels[i];
279 if (c != NULL) {
280 max = MAX(max, c->rfd);
281 max = MAX(max, c->wfd);
282 max = MAX(max, c->efd);
283 }
284 }
285 return max;
286}
287
288int
289channel_close_fd(int *fdp)
290{
291 int ret = 0, fd = *fdp;
292
293 if (fd != -1) {
294 ret = close(fd);
295 *fdp = -1;
296 if (fd == channel_max_fd)
297 channel_max_fd = channel_find_maxfd();
298 }
299 return ret;
300}
301
Damien Miller6f83b8e2000-05-02 09:23:45 +1000302/* Close all channel fd/socket. */
303
Ben Lindstrombba81212001-06-25 05:01:22 +0000304static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000305channel_close_fds(Channel *c)
306{
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000307 debug3("channel_close_fds: channel %d: r %d w %d e %d",
308 c->self, c->rfd, c->wfd, c->efd);
309
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000310 channel_close_fd(&c->sock);
311 channel_close_fd(&c->rfd);
312 channel_close_fd(&c->wfd);
313 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000314}
315
316/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000317
Damien Miller4af51302000-04-16 11:18:38 +1000318void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000319channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000320{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000321 char *s;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000322 int i, n;
323
324 for (n = 0, i = 0; i < channels_alloc; i++)
325 if (channels[i])
326 n++;
Ben Lindstrom4c247552001-06-05 20:56:47 +0000327 debug("channel_free: channel %d: %s, nchannels %d", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000328 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000329
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000330 s = channel_open_message();
Ben Lindstrom4c247552001-06-05 20:56:47 +0000331 debug3("channel_free: status: %s", s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000332 xfree(s);
333
Ben Lindstrom809744e2001-07-04 05:26:06 +0000334 if (c->detach_user != NULL) {
335 debug("channel_free: channel %d: detaching channel user", c->self);
336 c->detach_user(c->self, NULL);
Damien Miller33b13562000-04-04 14:38:59 +1000337 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000338 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000339 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000340 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000341 buffer_free(&c->input);
342 buffer_free(&c->output);
343 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000344 if (c->remote_name) {
345 xfree(c->remote_name);
346 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100347 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000348 channels[c->self] = NULL;
349 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000350}
351
Ben Lindstrome9c99912001-06-09 00:41:05 +0000352void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000353channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000354{
355 int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000356
Ben Lindstrom601e4362001-06-21 03:19:23 +0000357 for (i = 0; i < channels_alloc; i++)
358 if (channels[i] != NULL)
359 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000360}
361
362/*
363 * Closes the sockets/fds of all channels. This is used to close extra file
364 * descriptors after a fork.
365 */
366
367void
368channel_close_all()
369{
370 int i;
371
372 for (i = 0; i < channels_alloc; i++)
373 if (channels[i] != NULL)
374 channel_close_fds(channels[i]);
375}
376
377/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000378 * Stop listening to channels.
379 */
380
381void
382channel_stop_listening(void)
383{
384 int i;
385 Channel *c;
386
387 for (i = 0; i < channels_alloc; i++) {
388 c = channels[i];
389 if (c != NULL) {
390 switch (c->type) {
391 case SSH_CHANNEL_AUTH_SOCKET:
392 case SSH_CHANNEL_PORT_LISTENER:
393 case SSH_CHANNEL_RPORT_LISTENER:
394 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000395 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000396 channel_free(c);
397 break;
398 }
399 }
400 }
401}
402
403/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000404 * Returns true if no channel has too much buffered data, and false if one or
405 * more channel is overfull.
406 */
407
408int
409channel_not_very_much_buffered_data()
410{
411 u_int i;
412 Channel *c;
413
414 for (i = 0; i < channels_alloc; i++) {
415 c = channels[i];
416 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000417#if 0
418 if (!compat20 &&
419 buffer_len(&c->input) > packet_get_maxsize()) {
Ben Lindstrome9c99912001-06-09 00:41:05 +0000420 debug("channel %d: big input buffer %d",
421 c->self, buffer_len(&c->input));
422 return 0;
423 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000424#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000425 if (buffer_len(&c->output) > packet_get_maxsize()) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000426 debug("channel %d: big output buffer %d > %d",
427 c->self, buffer_len(&c->output),
428 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000429 return 0;
430 }
431 }
432 }
433 return 1;
434}
435
436/* Returns true if any channel is still open. */
437
438int
439channel_still_open()
440{
441 int i;
442 Channel *c;
443
444 for (i = 0; i < channels_alloc; i++) {
445 c = channels[i];
446 if (c == NULL)
447 continue;
448 switch (c->type) {
449 case SSH_CHANNEL_X11_LISTENER:
450 case SSH_CHANNEL_PORT_LISTENER:
451 case SSH_CHANNEL_RPORT_LISTENER:
452 case SSH_CHANNEL_CLOSED:
453 case SSH_CHANNEL_AUTH_SOCKET:
454 case SSH_CHANNEL_DYNAMIC:
455 case SSH_CHANNEL_CONNECTING:
456 case SSH_CHANNEL_ZOMBIE:
457 continue;
458 case SSH_CHANNEL_LARVAL:
459 if (!compat20)
460 fatal("cannot happen: SSH_CHANNEL_LARVAL");
461 continue;
462 case SSH_CHANNEL_OPENING:
463 case SSH_CHANNEL_OPEN:
464 case SSH_CHANNEL_X11_OPEN:
465 return 1;
466 case SSH_CHANNEL_INPUT_DRAINING:
467 case SSH_CHANNEL_OUTPUT_DRAINING:
468 if (!compat13)
469 fatal("cannot happen: OUT_DRAIN");
470 return 1;
471 default:
472 fatal("channel_still_open: bad channel type %d", c->type);
473 /* NOTREACHED */
474 }
475 }
476 return 0;
477}
478
479/* Returns the id of an open channel suitable for keepaliving */
480
481int
482channel_find_open()
483{
484 int i;
485 Channel *c;
486
487 for (i = 0; i < channels_alloc; i++) {
488 c = channels[i];
489 if (c == NULL)
490 continue;
491 switch (c->type) {
492 case SSH_CHANNEL_CLOSED:
493 case SSH_CHANNEL_DYNAMIC:
494 case SSH_CHANNEL_X11_LISTENER:
495 case SSH_CHANNEL_PORT_LISTENER:
496 case SSH_CHANNEL_RPORT_LISTENER:
497 case SSH_CHANNEL_OPENING:
498 case SSH_CHANNEL_CONNECTING:
499 case SSH_CHANNEL_ZOMBIE:
500 continue;
501 case SSH_CHANNEL_LARVAL:
502 case SSH_CHANNEL_AUTH_SOCKET:
503 case SSH_CHANNEL_OPEN:
504 case SSH_CHANNEL_X11_OPEN:
505 return i;
506 case SSH_CHANNEL_INPUT_DRAINING:
507 case SSH_CHANNEL_OUTPUT_DRAINING:
508 if (!compat13)
509 fatal("cannot happen: OUT_DRAIN");
510 return i;
511 default:
512 fatal("channel_find_open: bad channel type %d", c->type);
513 /* NOTREACHED */
514 }
515 }
516 return -1;
517}
518
519
520/*
521 * Returns a message describing the currently open forwarded connections,
522 * suitable for sending to the client. The message contains crlf pairs for
523 * newlines.
524 */
525
526char *
527channel_open_message()
528{
529 Buffer buffer;
530 Channel *c;
531 char buf[1024], *cp;
532 int i;
533
534 buffer_init(&buffer);
535 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
536 buffer_append(&buffer, buf, strlen(buf));
537 for (i = 0; i < channels_alloc; i++) {
538 c = channels[i];
539 if (c == NULL)
540 continue;
541 switch (c->type) {
542 case SSH_CHANNEL_X11_LISTENER:
543 case SSH_CHANNEL_PORT_LISTENER:
544 case SSH_CHANNEL_RPORT_LISTENER:
545 case SSH_CHANNEL_CLOSED:
546 case SSH_CHANNEL_AUTH_SOCKET:
547 case SSH_CHANNEL_ZOMBIE:
548 continue;
549 case SSH_CHANNEL_LARVAL:
550 case SSH_CHANNEL_OPENING:
551 case SSH_CHANNEL_CONNECTING:
552 case SSH_CHANNEL_DYNAMIC:
553 case SSH_CHANNEL_OPEN:
554 case SSH_CHANNEL_X11_OPEN:
555 case SSH_CHANNEL_INPUT_DRAINING:
556 case SSH_CHANNEL_OUTPUT_DRAINING:
557 snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
558 c->self, c->remote_name,
559 c->type, c->remote_id,
560 c->istate, buffer_len(&c->input),
561 c->ostate, buffer_len(&c->output),
562 c->rfd, c->wfd);
563 buffer_append(&buffer, buf, strlen(buf));
564 continue;
565 default:
566 fatal("channel_open_message: bad channel type %d", c->type);
567 /* NOTREACHED */
568 }
569 }
570 buffer_append(&buffer, "\0", 1);
571 cp = xstrdup(buffer_ptr(&buffer));
572 buffer_free(&buffer);
573 return cp;
574}
575
576void
577channel_send_open(int id)
578{
579 Channel *c = channel_lookup(id);
580 if (c == NULL) {
581 log("channel_send_open: %d: bad id", id);
582 return;
583 }
584 debug("send channel open %d", id);
585 packet_start(SSH2_MSG_CHANNEL_OPEN);
586 packet_put_cstring(c->ctype);
587 packet_put_int(c->self);
588 packet_put_int(c->local_window);
589 packet_put_int(c->local_maxpacket);
590 packet_send();
591}
592
593void
594channel_request(int id, char *service, int wantconfirm)
595{
596 channel_request_start(id, service, wantconfirm);
597 packet_send();
598 debug("channel request %d: %s", id, service) ;
599}
600void
601channel_request_start(int id, char *service, int wantconfirm)
602{
603 Channel *c = channel_lookup(id);
604 if (c == NULL) {
605 log("channel_request: %d: bad id", id);
606 return;
607 }
608 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
614channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
615{
616 Channel *c = channel_lookup(id);
617 if (c == NULL) {
618 log("channel_register_callback: %d: bad id", id);
619 return;
620 }
621 c->cb_event = mtype;
622 c->cb_fn = fn;
623 c->cb_arg = arg;
624}
625void
626channel_register_cleanup(int id, channel_callback_fn *fn)
627{
628 Channel *c = channel_lookup(id);
629 if (c == NULL) {
630 log("channel_register_cleanup: %d: bad id", id);
631 return;
632 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000633 c->detach_user = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000634}
635void
636channel_cancel_cleanup(int id)
637{
638 Channel *c = channel_lookup(id);
639 if (c == NULL) {
640 log("channel_cancel_cleanup: %d: bad id", id);
641 return;
642 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000643 c->detach_user = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000644}
645void
646channel_register_filter(int id, channel_filter_fn *fn)
647{
648 Channel *c = channel_lookup(id);
649 if (c == NULL) {
650 log("channel_register_filter: %d: bad id", id);
651 return;
652 }
653 c->input_filter = fn;
654}
655
656void
657channel_set_fds(int id, int rfd, int wfd, int efd,
658 int extusage, int nonblock)
659{
660 Channel *c = channel_lookup(id);
661 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
662 fatal("channel_activate for non-larval channel %d.", id);
663 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
664 c->type = SSH_CHANNEL_OPEN;
665 /* XXX window size? */
666 c->local_window = c->local_window_max = c->local_maxpacket * 2;
667 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
668 packet_put_int(c->remote_id);
669 packet_put_int(c->local_window);
670 packet_send();
671}
672
Damien Miller5428f641999-11-25 11:54:57 +1100673/*
Damien Millerb38eff82000-04-01 11:09:21 +1000674 * 'channel_pre*' are called just before select() to add any bits relevant to
675 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100676 */
Damien Millerb38eff82000-04-01 11:09:21 +1000677/*
678 * 'channel_post*': perform any appropriate operations for channels which
679 * have events pending.
680 */
681typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
682chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
683chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
684
Ben Lindstrombba81212001-06-25 05:01:22 +0000685static void
Damien Millerb38eff82000-04-01 11:09:21 +1000686channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
687{
688 FD_SET(c->sock, readset);
689}
690
Ben Lindstrombba81212001-06-25 05:01:22 +0000691static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000692channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
693{
694 debug3("channel %d: waiting for connection", c->self);
695 FD_SET(c->sock, writeset);
696}
697
Ben Lindstrombba81212001-06-25 05:01:22 +0000698static void
Damien Millerb38eff82000-04-01 11:09:21 +1000699channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
700{
701 if (buffer_len(&c->input) < packet_get_maxsize())
702 FD_SET(c->sock, readset);
703 if (buffer_len(&c->output) > 0)
704 FD_SET(c->sock, writeset);
705}
706
Ben Lindstrombba81212001-06-25 05:01:22 +0000707static void
Damien Millerb38eff82000-04-01 11:09:21 +1000708channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
709{
710 /* test whether sockets are 'alive' for read/write */
711 if (c->istate == CHAN_INPUT_OPEN)
712 if (buffer_len(&c->input) < packet_get_maxsize())
713 FD_SET(c->sock, readset);
714 if (c->ostate == CHAN_OUTPUT_OPEN ||
715 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
716 if (buffer_len(&c->output) > 0) {
717 FD_SET(c->sock, writeset);
718 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
719 chan_obuf_empty(c);
720 }
721 }
722}
723
Ben Lindstrombba81212001-06-25 05:01:22 +0000724static void
Damien Miller33b13562000-04-04 14:38:59 +1000725channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
726{
727 if (c->istate == CHAN_INPUT_OPEN &&
728 c->remote_window > 0 &&
729 buffer_len(&c->input) < c->remote_window)
730 FD_SET(c->rfd, readset);
731 if (c->ostate == CHAN_OUTPUT_OPEN ||
732 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
733 if (buffer_len(&c->output) > 0) {
734 FD_SET(c->wfd, writeset);
735 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
736 chan_obuf_empty(c);
737 }
738 }
739 /** XXX check close conditions, too */
740 if (c->efd != -1) {
741 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
742 buffer_len(&c->extended) > 0)
743 FD_SET(c->efd, writeset);
744 else if (c->extended_usage == CHAN_EXTENDED_READ &&
745 buffer_len(&c->extended) < c->remote_window)
746 FD_SET(c->efd, readset);
747 }
748}
749
Ben Lindstrombba81212001-06-25 05:01:22 +0000750static void
Damien Millerb38eff82000-04-01 11:09:21 +1000751channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
752{
753 if (buffer_len(&c->input) == 0) {
754 packet_start(SSH_MSG_CHANNEL_CLOSE);
755 packet_put_int(c->remote_id);
756 packet_send();
757 c->type = SSH_CHANNEL_CLOSED;
Ben Lindstromc486d882001-04-11 16:08:34 +0000758 debug("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000759 }
760}
761
Ben Lindstrombba81212001-06-25 05:01:22 +0000762static void
Damien Millerb38eff82000-04-01 11:09:21 +1000763channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
764{
765 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000766 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000767 else
Damien Millerb38eff82000-04-01 11:09:21 +1000768 FD_SET(c->sock, writeset);
769}
770
771/*
772 * This is a special state for X11 authentication spoofing. An opened X11
773 * connection (when authentication spoofing is being done) remains in this
774 * state until the first packet has been completely read. The authentication
775 * data in that packet is then substituted by the real data if it matches the
776 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000777 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000778 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000779 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000780static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000781x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000782{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000783 u_char *ucp;
784 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000785
786 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000787 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000788 return 0;
789
790 /* Parse the lengths of variable-length fields. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000791 ucp = (u_char *) buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000792 if (ucp[0] == 0x42) { /* Byte order MSB first. */
793 proto_len = 256 * ucp[6] + ucp[7];
794 data_len = 256 * ucp[8] + ucp[9];
795 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
796 proto_len = ucp[6] + 256 * ucp[7];
797 data_len = ucp[8] + 256 * ucp[9];
798 } else {
799 debug("Initial X11 packet contains bad byte order byte: 0x%x",
800 ucp[0]);
801 return -1;
802 }
803
804 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000805 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000806 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
807 return 0;
808
809 /* Check if authentication protocol matches. */
810 if (proto_len != strlen(x11_saved_proto) ||
811 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
812 debug("X11 connection uses different authentication protocol.");
813 return -1;
814 }
815 /* Check if authentication data matches our fake data. */
816 if (data_len != x11_fake_data_len ||
817 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
818 x11_fake_data, x11_fake_data_len) != 0) {
819 debug("X11 auth data does not match fake data.");
820 return -1;
821 }
822 /* Check fake data length */
823 if (x11_fake_data_len != x11_saved_data_len) {
824 error("X11 fake_data_len %d != saved_data_len %d",
825 x11_fake_data_len, x11_saved_data_len);
826 return -1;
827 }
828 /*
829 * Received authentication protocol and data match
830 * our fake data. Substitute the fake data with real
831 * data.
832 */
833 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
834 x11_saved_data, x11_saved_data_len);
835 return 1;
836}
837
Ben Lindstrombba81212001-06-25 05:01:22 +0000838static void
Damien Millerb38eff82000-04-01 11:09:21 +1000839channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
840{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000841 int ret = x11_open_helper(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000842 if (ret == 1) {
843 /* Start normal processing for the channel. */
844 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000845 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000846 } else if (ret == -1) {
847 /*
848 * We have received an X11 connection that has bad
849 * authentication information.
850 */
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000851 log("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000852 buffer_clear(&c->input);
853 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000854 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000855 c->sock = -1;
856 c->type = SSH_CHANNEL_CLOSED;
857 packet_start(SSH_MSG_CHANNEL_CLOSE);
858 packet_put_int(c->remote_id);
859 packet_send();
860 }
861}
862
Ben Lindstrombba81212001-06-25 05:01:22 +0000863static void
Damien Millerbd483e72000-04-30 10:00:53 +1000864channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000865{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000866 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000867
868 /* c->force_drain = 1; */
869
Damien Millerb38eff82000-04-01 11:09:21 +1000870 if (ret == 1) {
871 c->type = SSH_CHANNEL_OPEN;
Damien Miller30c3d422000-05-09 11:02:59 +1000872 if (compat20)
873 channel_pre_open_20(c, readset, writeset);
874 else
875 channel_pre_open_15(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000876 } else if (ret == -1) {
877 debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerbd483e72000-04-30 10:00:53 +1000878 chan_read_failed(c); /** force close? */
Damien Millerb38eff82000-04-01 11:09:21 +1000879 chan_write_failed(c);
880 debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
881 }
882}
883
Ben Lindstromb3921512001-04-11 15:57:50 +0000884/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000885static int
Ben Lindstromb3921512001-04-11 15:57:50 +0000886channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000887{
888 u_char *p, *host;
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000889 int len, have, i, found;
Ben Lindstromb3921512001-04-11 15:57:50 +0000890 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000891 struct {
892 u_int8_t version;
893 u_int8_t command;
894 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000895 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000896 } s4_req, s4_rsp;
897
Ben Lindstromb3921512001-04-11 15:57:50 +0000898 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000899
900 have = buffer_len(&c->input);
901 len = sizeof(s4_req);
902 if (have < len)
903 return 0;
904 p = buffer_ptr(&c->input);
905 for (found = 0, i = len; i < have; i++) {
906 if (p[i] == '\0') {
907 found = 1;
908 break;
909 }
910 if (i > 1024) {
911 /* the peer is probably sending garbage */
912 debug("channel %d: decode socks4: too long",
913 c->self);
914 return -1;
915 }
916 }
917 if (!found)
918 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000919 buffer_get(&c->input, (char *)&s4_req.version, 1);
920 buffer_get(&c->input, (char *)&s4_req.command, 1);
921 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000922 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000923 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000924 p = buffer_ptr(&c->input);
925 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000926 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000927 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000928 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000929 c->self, len, have);
930 strlcpy(username, p, sizeof(username));
931 buffer_consume(&c->input, len);
932 buffer_consume(&c->input, 1); /* trailing '\0' */
933
Ben Lindstromb3921512001-04-11 15:57:50 +0000934 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000935 strlcpy(c->path, host, sizeof(c->path));
936 c->host_port = ntohs(s4_req.dest_port);
937
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000938 debug("channel %d: dynamic request: socks4 host %s port %u command %u",
939 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000940
Ben Lindstromb3921512001-04-11 15:57:50 +0000941 if (s4_req.command != 1) {
942 debug("channel %d: cannot handle: socks4 cn %d",
943 c->self, s4_req.command);
944 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000945 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000946 s4_rsp.version = 0; /* vn: 0 for reply */
947 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000948 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000949 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000950 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000951 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000952}
953
Ben Lindstromb3921512001-04-11 15:57:50 +0000954/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +0000955static void
Ben Lindstromb3921512001-04-11 15:57:50 +0000956channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
957{
958 u_char *p;
959 int have, ret;
960
961 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +1000962 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +0000963 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +0000964 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +0000965 /* check if the fixed size part of the packet is in buffer. */
966 if (have < 4) {
967 /* need more */
968 FD_SET(c->sock, readset);
969 return;
970 }
971 /* try to guess the protocol */
972 p = buffer_ptr(&c->input);
973 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000974 case 0x04:
975 ret = channel_decode_socks4(c, readset, writeset);
976 break;
Ben Lindstromb3921512001-04-11 15:57:50 +0000977 default:
978 ret = -1;
979 break;
980 }
981 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000982 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +0000983 } else if (ret == 0) {
984 debug2("channel %d: pre_dynamic: need more", c->self);
985 /* need more */
986 FD_SET(c->sock, readset);
987 } else {
988 /* switch to the next state */
989 c->type = SSH_CHANNEL_OPENING;
990 port_open_helper(c, "direct-tcpip");
991 }
992}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000993
Damien Millerb38eff82000-04-01 11:09:21 +1000994/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000995static void
Damien Millerb38eff82000-04-01 11:09:21 +1000996channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
997{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000998 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +1000999 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001000 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001001 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001002 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001003 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001004
1005 if (FD_ISSET(c->sock, readset)) {
1006 debug("X11 connection requested.");
1007 addrlen = sizeof(addr);
1008 newsock = accept(c->sock, &addr, &addrlen);
1009 if (newsock < 0) {
1010 error("accept: %.100s", strerror(errno));
1011 return;
1012 }
Damien Millerd83ff352001-01-30 09:19:34 +11001013 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001014 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001015 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001016 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001017
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001018 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001019 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1020 c->local_window_max, c->local_maxpacket,
Damien Miller69b69aa2000-10-28 14:19:58 +11001021 0, xstrdup(buf), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001022 if (nc == NULL) {
1023 close(newsock);
1024 xfree(remote_ipaddr);
1025 return;
1026 }
Damien Millerbd483e72000-04-30 10:00:53 +10001027 if (compat20) {
1028 packet_start(SSH2_MSG_CHANNEL_OPEN);
1029 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001030 packet_put_int(nc->self);
Damien Millerbd483e72000-04-30 10:00:53 +10001031 packet_put_int(c->local_window_max);
1032 packet_put_int(c->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001033 /* originator ipaddr and port */
1034 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001035 if (datafellows & SSH_BUG_X11FWD) {
1036 debug("ssh2 x11 bug compat mode");
1037 } else {
1038 packet_put_int(remote_port);
1039 }
Damien Millerbd483e72000-04-30 10:00:53 +10001040 packet_send();
1041 } else {
1042 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001043 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001044 if (packet_get_protocol_flags() &
1045 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001046 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001047 packet_send();
1048 }
Damien Millerd83ff352001-01-30 09:19:34 +11001049 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001050 }
1051}
1052
Ben Lindstrombba81212001-06-25 05:01:22 +00001053static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001054port_open_helper(Channel *c, char *rtype)
1055{
1056 int direct;
1057 char buf[1024];
1058 char *remote_ipaddr = get_peer_ipaddr(c->sock);
1059 u_short remote_port = get_peer_port(c->sock);
1060
1061 direct = (strcmp(rtype, "direct-tcpip") == 0);
1062
1063 snprintf(buf, sizeof buf,
1064 "%s: listening port %d for %.100s port %d, "
1065 "connect from %.200s port %d",
1066 rtype, c->listening_port, c->path, c->host_port,
1067 remote_ipaddr, remote_port);
1068
1069 xfree(c->remote_name);
1070 c->remote_name = xstrdup(buf);
1071
1072 if (compat20) {
1073 packet_start(SSH2_MSG_CHANNEL_OPEN);
1074 packet_put_cstring(rtype);
1075 packet_put_int(c->self);
1076 packet_put_int(c->local_window_max);
1077 packet_put_int(c->local_maxpacket);
1078 if (direct) {
1079 /* target host, port */
1080 packet_put_cstring(c->path);
1081 packet_put_int(c->host_port);
1082 } else {
1083 /* listen address, port */
1084 packet_put_cstring(c->path);
1085 packet_put_int(c->listening_port);
1086 }
1087 /* originator host and port */
1088 packet_put_cstring(remote_ipaddr);
1089 packet_put_int(remote_port);
1090 packet_send();
1091 } else {
1092 packet_start(SSH_MSG_PORT_OPEN);
1093 packet_put_int(c->self);
1094 packet_put_cstring(c->path);
1095 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001096 if (packet_get_protocol_flags() &
1097 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001098 packet_put_cstring(c->remote_name);
1099 packet_send();
1100 }
1101 xfree(remote_ipaddr);
1102}
1103
Damien Millerb38eff82000-04-01 11:09:21 +10001104/*
1105 * This socket is listening for connections to a forwarded TCP/IP port.
1106 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001107static void
Damien Millerb38eff82000-04-01 11:09:21 +10001108channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1109{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001110 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001111 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001112 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001113 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001114 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001115
Damien Millerb38eff82000-04-01 11:09:21 +10001116 if (FD_ISSET(c->sock, readset)) {
1117 debug("Connection to port %d forwarding "
1118 "to %.100s port %d requested.",
1119 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001120
Damien Miller4623a752001-10-10 15:03:58 +10001121 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1122 nextstate = SSH_CHANNEL_OPENING;
1123 rtype = "forwarded-tcpip";
1124 } else {
1125 if (c->host_port == 0) {
1126 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001127 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001128 } else {
1129 nextstate = SSH_CHANNEL_OPENING;
1130 rtype = "direct-tcpip";
1131 }
1132 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001133
Damien Millerb38eff82000-04-01 11:09:21 +10001134 addrlen = sizeof(addr);
1135 newsock = accept(c->sock, &addr, &addrlen);
1136 if (newsock < 0) {
1137 error("accept: %.100s", strerror(errno));
1138 return;
1139 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001140 nc = channel_new(rtype,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001141 nextstate, newsock, newsock, -1,
Damien Millerb38eff82000-04-01 11:09:21 +10001142 c->local_window_max, c->local_maxpacket,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001143 0, xstrdup(rtype), 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001144 if (nc == NULL) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001145 error("channel_post_port_listener: no new channel:");
1146 close(newsock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001147 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001148 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001149 nc->listening_port = c->listening_port;
1150 nc->host_port = c->host_port;
1151 strlcpy(nc->path, c->path, sizeof(nc->path));
1152
Damien Miller4623a752001-10-10 15:03:58 +10001153 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1154 /*
1155 * do not call the channel_post handler until
1156 * this flag has been reset by a pre-handler.
1157 * otherwise the FD_ISSET calls might overflow
1158 */
1159 nc->delayed = 1;
1160 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001161 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001162 }
Damien Millerb38eff82000-04-01 11:09:21 +10001163 }
1164}
1165
1166/*
1167 * This is the authentication agent socket listening for connections from
1168 * clients.
1169 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001170static void
Damien Millerb38eff82000-04-01 11:09:21 +10001171channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1172{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001173 Channel *nc;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001174 char *name;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001175 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001176 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001177 socklen_t addrlen;
1178
1179 if (FD_ISSET(c->sock, readset)) {
1180 addrlen = sizeof(addr);
1181 newsock = accept(c->sock, &addr, &addrlen);
1182 if (newsock < 0) {
1183 error("accept from auth socket: %.100s", strerror(errno));
1184 return;
1185 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001186 name = xstrdup("accepted auth socket");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001187 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001188 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1189 c->local_window_max, c->local_maxpacket,
Ben Lindstrome9c99912001-06-09 00:41:05 +00001190 0, name, 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001191 if (nc == NULL) {
1192 error("channel_post_auth_listener: channel_new failed");
Ben Lindstrome9c99912001-06-09 00:41:05 +00001193 xfree(name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001194 close(newsock);
1195 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001196 if (compat20) {
1197 packet_start(SSH2_MSG_CHANNEL_OPEN);
1198 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001199 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001200 packet_put_int(c->local_window_max);
1201 packet_put_int(c->local_maxpacket);
1202 } else {
1203 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001204 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001205 }
Damien Millerb38eff82000-04-01 11:09:21 +10001206 packet_send();
1207 }
1208}
1209
Ben Lindstrombba81212001-06-25 05:01:22 +00001210static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001211channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1212{
Ben Lindstrom69128662001-05-08 20:07:39 +00001213 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001214 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001215
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001216 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001217 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err,
1218 &sz) < 0) {
1219 err = errno;
1220 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001221 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001222 if (err == 0) {
1223 debug("channel %d: connected", c->self);
1224 c->type = SSH_CHANNEL_OPEN;
1225 if (compat20) {
1226 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1227 packet_put_int(c->remote_id);
1228 packet_put_int(c->self);
1229 packet_put_int(c->local_window);
1230 packet_put_int(c->local_maxpacket);
1231 } else {
1232 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1233 packet_put_int(c->remote_id);
1234 packet_put_int(c->self);
1235 }
1236 } else {
1237 debug("channel %d: not connected: %s",
1238 c->self, strerror(err));
1239 if (compat20) {
1240 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1241 packet_put_int(c->remote_id);
1242 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1243 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1244 packet_put_cstring(strerror(err));
1245 packet_put_cstring("");
1246 }
1247 } else {
1248 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1249 packet_put_int(c->remote_id);
1250 }
1251 chan_mark_dead(c);
1252 }
1253 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001254 }
1255}
1256
Ben Lindstrombba81212001-06-25 05:01:22 +00001257static int
Damien Millerb38eff82000-04-01 11:09:21 +10001258channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1259{
1260 char buf[16*1024];
1261 int len;
1262
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001263 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001264 FD_ISSET(c->rfd, readset)) {
1265 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001266 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1267 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001268 if (len <= 0) {
Damien Millerbd483e72000-04-30 10:00:53 +10001269 debug("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001270 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001271 if (c->type != SSH_CHANNEL_OPEN) {
1272 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001273 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001274 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001275 } else if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001276 buffer_consume(&c->output, buffer_len(&c->output));
1277 c->type = SSH_CHANNEL_INPUT_DRAINING;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001278 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001279 } else {
1280 chan_read_failed(c);
1281 }
1282 return -1;
1283 }
Damien Millerad833b32000-08-23 10:46:23 +10001284 if(c->input_filter != NULL) {
1285 if (c->input_filter(c, buf, len) == -1) {
Ben Lindstromc486d882001-04-11 16:08:34 +00001286 debug("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001287 chan_read_failed(c);
1288 }
1289 } else {
1290 buffer_append(&c->input, buf, len);
1291 }
Damien Millerb38eff82000-04-01 11:09:21 +10001292 }
1293 return 1;
1294}
Ben Lindstrombba81212001-06-25 05:01:22 +00001295static int
Damien Millerb38eff82000-04-01 11:09:21 +10001296channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1297{
Ben Lindstrome229b252001-03-05 06:28:06 +00001298 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001299 u_char *data;
1300 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001301 int len;
1302
1303 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001304 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001305 FD_ISSET(c->wfd, writeset) &&
1306 buffer_len(&c->output) > 0) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001307 data = buffer_ptr(&c->output);
1308 dlen = buffer_len(&c->output);
1309 len = write(c->wfd, data, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001310 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1311 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001312 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001313 if (c->type != SSH_CHANNEL_OPEN) {
1314 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001315 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001316 return -1;
1317 } else if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001318 buffer_consume(&c->output, buffer_len(&c->output));
Ben Lindstrome9c99912001-06-09 00:41:05 +00001319 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001320 c->type = SSH_CHANNEL_INPUT_DRAINING;
1321 } else {
1322 chan_write_failed(c);
1323 }
1324 return -1;
1325 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001326 if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001327 if (tcgetattr(c->wfd, &tio) == 0 &&
1328 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1329 /*
1330 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001331 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001332 * size of a SSH2_MSG_CHANNEL_DATA message
1333 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +11001334 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001335 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001336 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001337 }
1338 }
Damien Millerb38eff82000-04-01 11:09:21 +10001339 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001340 if (compat20 && len > 0) {
1341 c->local_consumed += len;
1342 }
1343 }
1344 return 1;
1345}
Ben Lindstrombba81212001-06-25 05:01:22 +00001346static int
Damien Miller33b13562000-04-04 14:38:59 +10001347channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1348{
1349 char buf[16*1024];
1350 int len;
1351
Damien Miller1383bd82000-04-06 12:32:37 +10001352/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001353 if (c->efd != -1) {
1354 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1355 FD_ISSET(c->efd, writeset) &&
1356 buffer_len(&c->extended) > 0) {
1357 len = write(c->efd, buffer_ptr(&c->extended),
1358 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001359 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001360 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001361 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1362 return 1;
1363 if (len <= 0) {
1364 debug2("channel %d: closing write-efd %d",
1365 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001366 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001367 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001368 buffer_consume(&c->extended, len);
1369 c->local_consumed += len;
1370 }
1371 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1372 FD_ISSET(c->efd, readset)) {
1373 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001374 debug2("channel %d: read %d from efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001375 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001376 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1377 return 1;
1378 if (len <= 0) {
1379 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001380 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001381 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001382 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001383 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001384 }
Damien Miller33b13562000-04-04 14:38:59 +10001385 }
1386 }
1387 return 1;
1388}
Ben Lindstrombba81212001-06-25 05:01:22 +00001389static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001390channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001391{
Ben Lindstromb3921512001-04-11 15:57:50 +00001392 if (c->type == SSH_CHANNEL_OPEN &&
1393 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001394 c->local_window < c->local_window_max/2 &&
1395 c->local_consumed > 0) {
1396 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1397 packet_put_int(c->remote_id);
1398 packet_put_int(c->local_consumed);
1399 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001400 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001401 c->self, c->local_window,
1402 c->local_consumed);
1403 c->local_window += c->local_consumed;
1404 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001405 }
1406 return 1;
1407}
1408
Ben Lindstrombba81212001-06-25 05:01:22 +00001409static void
Damien Millerb38eff82000-04-01 11:09:21 +10001410channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
1411{
Damien Miller4623a752001-10-10 15:03:58 +10001412 if (c->delayed)
1413 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001414 channel_handle_rfd(c, readset, writeset);
1415 channel_handle_wfd(c, readset, writeset);
1416}
1417
Ben Lindstrombba81212001-06-25 05:01:22 +00001418static void
Damien Miller33b13562000-04-04 14:38:59 +10001419channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
1420{
Damien Miller4623a752001-10-10 15:03:58 +10001421 if (c->delayed)
1422 return;
Damien Miller33b13562000-04-04 14:38:59 +10001423 channel_handle_rfd(c, readset, writeset);
1424 channel_handle_wfd(c, readset, writeset);
1425 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001426
1427 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001428}
1429
Ben Lindstrombba81212001-06-25 05:01:22 +00001430static void
Damien Millerb38eff82000-04-01 11:09:21 +10001431channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1432{
1433 int len;
1434 /* Send buffered output data to the socket. */
1435 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1436 len = write(c->sock, buffer_ptr(&c->output),
1437 buffer_len(&c->output));
1438 if (len <= 0)
1439 buffer_consume(&c->output, buffer_len(&c->output));
1440 else
1441 buffer_consume(&c->output, len);
1442 }
1443}
1444
Ben Lindstrombba81212001-06-25 05:01:22 +00001445static void
Damien Miller33b13562000-04-04 14:38:59 +10001446channel_handler_init_20(void)
1447{
1448 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
Damien Millerbd483e72000-04-30 10:00:53 +10001449 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001450 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001451 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001452 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001453 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001454 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001455 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001456
1457 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
1458 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001459 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001460 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001461 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001462 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Ben Lindstromb3921512001-04-11 15:57:50 +00001463 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2;
Damien Miller33b13562000-04-04 14:38:59 +10001464}
1465
Ben Lindstrombba81212001-06-25 05:01:22 +00001466static void
Damien Millerb38eff82000-04-01 11:09:21 +10001467channel_handler_init_13(void)
1468{
1469 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1470 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1471 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1472 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1473 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1474 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1475 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001476 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001477 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001478
1479 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
1480 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1481 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1482 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1483 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001484 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Ben Lindstromb3921512001-04-11 15:57:50 +00001485 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
Damien Millerb38eff82000-04-01 11:09:21 +10001486}
1487
Ben Lindstrombba81212001-06-25 05:01:22 +00001488static void
Damien Millerb38eff82000-04-01 11:09:21 +10001489channel_handler_init_15(void)
1490{
1491 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
Damien Millerbd483e72000-04-30 10:00:53 +10001492 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001493 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1494 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1495 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001496 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001497 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001498
1499 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1500 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1501 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1502 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001503 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Ben Lindstromb3921512001-04-11 15:57:50 +00001504 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
Damien Millerb38eff82000-04-01 11:09:21 +10001505}
1506
Ben Lindstrombba81212001-06-25 05:01:22 +00001507static void
Damien Millerb38eff82000-04-01 11:09:21 +10001508channel_handler_init(void)
1509{
1510 int i;
1511 for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
1512 channel_pre[i] = NULL;
1513 channel_post[i] = NULL;
1514 }
Damien Miller33b13562000-04-04 14:38:59 +10001515 if (compat20)
1516 channel_handler_init_20();
1517 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001518 channel_handler_init_13();
1519 else
1520 channel_handler_init_15();
1521}
1522
Ben Lindstrombba81212001-06-25 05:01:22 +00001523static void
Damien Millerb38eff82000-04-01 11:09:21 +10001524channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1525{
1526 static int did_init = 0;
1527 int i;
1528 Channel *c;
1529
1530 if (!did_init) {
1531 channel_handler_init();
1532 did_init = 1;
1533 }
1534 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001535 c = channels[i];
1536 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001537 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001538 if (ftab[c->type] != NULL)
1539 (*ftab[c->type])(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001540 if (chan_is_dead(c)) {
1541 /*
1542 * we have to remove the fd's from the select mask
1543 * before the channels are free'd and the fd's are
1544 * closed
1545 */
1546 if (c->wfd != -1)
1547 FD_CLR(c->wfd, writeset);
1548 if (c->rfd != -1)
1549 FD_CLR(c->rfd, readset);
1550 if (c->efd != -1) {
1551 if (c->extended_usage == CHAN_EXTENDED_READ)
1552 FD_CLR(c->efd, readset);
1553 if (c->extended_usage == CHAN_EXTENDED_WRITE)
1554 FD_CLR(c->efd, writeset);
1555 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001556 channel_free(c);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001557 }
Damien Millerb38eff82000-04-01 11:09:21 +10001558 }
1559}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001560
Ben Lindstrome9c99912001-06-09 00:41:05 +00001561/*
1562 * Allocate/update select bitmasks and add any bits relevant to channels in
1563 * select bitmasks.
1564 */
Damien Miller4af51302000-04-16 11:18:38 +10001565void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001566channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001567 int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001568{
Damien Miller5e953212001-01-30 09:14:00 +11001569 int n;
1570 u_int sz;
1571
1572 n = MAX(*maxfdp, channel_max_fd);
1573
1574 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001575 /* perhaps check sz < nalloc/2 and shrink? */
1576 if (*readsetp == NULL || sz > *nallocp) {
1577 *readsetp = xrealloc(*readsetp, sz);
1578 *writesetp = xrealloc(*writesetp, sz);
1579 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001580 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001581 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001582 memset(*readsetp, 0, sz);
1583 memset(*writesetp, 0, sz);
1584
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001585 if (!rekeying)
1586 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001587}
1588
Ben Lindstrome9c99912001-06-09 00:41:05 +00001589/*
1590 * After select, perform any appropriate operations for channels which have
1591 * events pending.
1592 */
Damien Miller4af51302000-04-16 11:18:38 +10001593void
Damien Miller95def091999-11-25 00:26:21 +11001594channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001595{
Damien Millerb38eff82000-04-01 11:09:21 +10001596 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001597}
1598
Ben Lindstrome9c99912001-06-09 00:41:05 +00001599
Damien Miller5e953212001-01-30 09:14:00 +11001600/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001601
Damien Miller4af51302000-04-16 11:18:38 +10001602void
Damien Miller95def091999-11-25 00:26:21 +11001603channel_output_poll()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001604{
Damien Miller95def091999-11-25 00:26:21 +11001605 int len, i;
Damien Millerb38eff82000-04-01 11:09:21 +10001606 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001607
Damien Miller95def091999-11-25 00:26:21 +11001608 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001609 c = channels[i];
1610 if (c == NULL)
1611 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001612
Ben Lindstrome9c99912001-06-09 00:41:05 +00001613 /*
1614 * We are only interested in channels that can have buffered
1615 * incoming data.
1616 */
Damien Miller34132e52000-01-14 15:45:46 +11001617 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001618 if (c->type != SSH_CHANNEL_OPEN &&
1619 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001620 continue;
1621 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001622 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001623 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001624 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001625 if (compat20 &&
1626 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001627 /* XXX is this true? */
Ben Lindstromb1131e92001-03-05 07:27:13 +00001628 debug2("channel %d: no data after CLOSE", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001629 continue;
1630 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001631
Damien Miller95def091999-11-25 00:26:21 +11001632 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001633 if ((c->istate == CHAN_INPUT_OPEN ||
1634 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1635 (len = buffer_len(&c->input)) > 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00001636 /*
1637 * Send some data for the other side over the secure
1638 * connection.
1639 */
Damien Miller33b13562000-04-04 14:38:59 +10001640 if (compat20) {
1641 if (len > c->remote_window)
1642 len = c->remote_window;
1643 if (len > c->remote_maxpacket)
1644 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001645 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001646 if (packet_is_interactive()) {
1647 if (len > 1024)
1648 len = 512;
1649 } else {
1650 /* Keep the packets at reasonable size. */
1651 if (len > packet_get_maxsize()/2)
1652 len = packet_get_maxsize()/2;
1653 }
Damien Miller95def091999-11-25 00:26:21 +11001654 }
Damien Millerb38eff82000-04-01 11:09:21 +10001655 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001656 packet_start(compat20 ?
1657 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001658 packet_put_int(c->remote_id);
1659 packet_put_string(buffer_ptr(&c->input), len);
1660 packet_send();
1661 buffer_consume(&c->input, len);
1662 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001663 }
1664 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001665 if (compat13)
1666 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001667 /*
1668 * input-buffer is empty and read-socket shutdown:
1669 * tell peer, that we will not send more data: send IEOF
1670 */
Damien Millerb38eff82000-04-01 11:09:21 +10001671 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001672 }
Damien Miller33b13562000-04-04 14:38:59 +10001673 /* Send extended data, i.e. stderr */
1674 if (compat20 &&
1675 c->remote_window > 0 &&
1676 (len = buffer_len(&c->extended)) > 0 &&
1677 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001678 debug2("channel %d: rwin %d elen %d euse %d",
1679 c->self, c->remote_window, buffer_len(&c->extended),
1680 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001681 if (len > c->remote_window)
1682 len = c->remote_window;
1683 if (len > c->remote_maxpacket)
1684 len = c->remote_maxpacket;
1685 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1686 packet_put_int(c->remote_id);
1687 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1688 packet_put_string(buffer_ptr(&c->extended), len);
1689 packet_send();
1690 buffer_consume(&c->extended, len);
1691 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001692 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001693 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001694 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001695}
1696
Ben Lindstrome9c99912001-06-09 00:41:05 +00001697
1698/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001699
Damien Miller4af51302000-04-16 11:18:38 +10001700void
Damien Miller62cee002000-09-23 17:15:56 +11001701channel_input_data(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001702{
Damien Miller34132e52000-01-14 15:45:46 +11001703 int id;
Damien Miller95def091999-11-25 00:26:21 +11001704 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001705 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001706 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001707
Damien Miller95def091999-11-25 00:26:21 +11001708 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001709 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001710 c = channel_lookup(id);
1711 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001712 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001713
Damien Miller95def091999-11-25 00:26:21 +11001714 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001715 if (c->type != SSH_CHANNEL_OPEN &&
1716 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001717 return;
1718
1719 /* same for protocol 1.5 if output end is no longer open */
Damien Millerb38eff82000-04-01 11:09:21 +10001720 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
Damien Miller95def091999-11-25 00:26:21 +11001721 return;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001722
Damien Miller95def091999-11-25 00:26:21 +11001723 /* Get the data. */
1724 data = packet_get_string(&data_len);
Damien Miller4af51302000-04-16 11:18:38 +10001725 packet_done();
Damien Millerb38eff82000-04-01 11:09:21 +10001726
Damien Miller33b13562000-04-04 14:38:59 +10001727 if (compat20){
1728 if (data_len > c->local_maxpacket) {
1729 log("channel %d: rcvd big packet %d, maxpack %d",
1730 c->self, data_len, c->local_maxpacket);
1731 }
1732 if (data_len > c->local_window) {
1733 log("channel %d: rcvd too much data %d, win %d",
1734 c->self, data_len, c->local_window);
1735 xfree(data);
1736 return;
1737 }
1738 c->local_window -= data_len;
1739 }else{
1740 packet_integrity_check(plen, 4 + 4 + data_len, type);
1741 }
Damien Millerb38eff82000-04-01 11:09:21 +10001742 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001743 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001744}
Ben Lindstrome9c99912001-06-09 00:41:05 +00001745
Damien Miller4af51302000-04-16 11:18:38 +10001746void
Damien Miller62cee002000-09-23 17:15:56 +11001747channel_input_extended_data(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001748{
1749 int id;
1750 int tcode;
1751 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001752 u_int data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001753 Channel *c;
1754
1755 /* Get the channel number and verify it. */
1756 id = packet_get_int();
1757 c = channel_lookup(id);
1758
1759 if (c == NULL)
1760 packet_disconnect("Received extended_data for bad channel %d.", id);
1761 if (c->type != SSH_CHANNEL_OPEN) {
1762 log("channel %d: ext data for non open", id);
1763 return;
1764 }
1765 tcode = packet_get_int();
1766 if (c->efd == -1 ||
1767 c->extended_usage != CHAN_EXTENDED_WRITE ||
1768 tcode != SSH2_EXTENDED_DATA_STDERR) {
1769 log("channel %d: bad ext data", c->self);
1770 return;
1771 }
1772 data = packet_get_string(&data_len);
Damien Miller4af51302000-04-16 11:18:38 +10001773 packet_done();
Damien Miller33b13562000-04-04 14:38:59 +10001774 if (data_len > c->local_window) {
1775 log("channel %d: rcvd too much extended_data %d, win %d",
1776 c->self, data_len, c->local_window);
1777 xfree(data);
1778 return;
1779 }
Damien Millerd3444942000-09-30 14:20:03 +11001780 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001781 c->local_window -= data_len;
1782 buffer_append(&c->extended, data, data_len);
1783 xfree(data);
1784}
1785
Damien Miller4af51302000-04-16 11:18:38 +10001786void
Damien Miller62cee002000-09-23 17:15:56 +11001787channel_input_ieof(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001788{
1789 int id;
1790 Channel *c;
1791
1792 packet_integrity_check(plen, 4, type);
1793
1794 id = packet_get_int();
1795 c = channel_lookup(id);
1796 if (c == NULL)
1797 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1798 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001799
1800 /* XXX force input close */
1801 if (c->force_drain) {
1802 debug("channel %d: FORCE input drain", c->self);
1803 c->istate = CHAN_INPUT_WAIT_DRAIN;
1804 }
1805
Damien Millerb38eff82000-04-01 11:09:21 +10001806}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001807
Damien Miller4af51302000-04-16 11:18:38 +10001808void
Damien Miller62cee002000-09-23 17:15:56 +11001809channel_input_close(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001810{
Damien Millerb38eff82000-04-01 11:09:21 +10001811 int id;
1812 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001813
Damien Millerb38eff82000-04-01 11:09:21 +10001814 packet_integrity_check(plen, 4, type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001815
Damien Millerb38eff82000-04-01 11:09:21 +10001816 id = packet_get_int();
1817 c = channel_lookup(id);
1818 if (c == NULL)
1819 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001820
1821 /*
1822 * Send a confirmation that we have closed the channel and no more
1823 * data is coming for it.
1824 */
Damien Miller95def091999-11-25 00:26:21 +11001825 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001826 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001827 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001828
Damien Miller5428f641999-11-25 11:54:57 +11001829 /*
1830 * If the channel is in closed state, we have sent a close request,
1831 * and the other side will eventually respond with a confirmation.
1832 * Thus, we cannot free the channel here, because then there would be
1833 * no-one to receive the confirmation. The channel gets freed when
1834 * the confirmation arrives.
1835 */
Damien Millerb38eff82000-04-01 11:09:21 +10001836 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11001837 /*
1838 * Not a closed channel - mark it as draining, which will
1839 * cause it to be freed later.
1840 */
Damien Millerb38eff82000-04-01 11:09:21 +10001841 buffer_consume(&c->input, buffer_len(&c->input));
1842 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11001843 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001844}
1845
Damien Millerb38eff82000-04-01 11:09:21 +10001846/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10001847void
Damien Miller62cee002000-09-23 17:15:56 +11001848channel_input_oclose(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001849{
Damien Millerb38eff82000-04-01 11:09:21 +10001850 int id = packet_get_int();
1851 Channel *c = channel_lookup(id);
1852 packet_integrity_check(plen, 4, type);
1853 if (c == NULL)
1854 packet_disconnect("Received oclose for nonexistent channel %d.", id);
1855 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001856}
1857
Damien Miller4af51302000-04-16 11:18:38 +10001858void
Damien Miller62cee002000-09-23 17:15:56 +11001859channel_input_close_confirmation(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001860{
1861 int id = packet_get_int();
1862 Channel *c = channel_lookup(id);
1863
Damien Miller4af51302000-04-16 11:18:38 +10001864 packet_done();
Damien Millerb38eff82000-04-01 11:09:21 +10001865 if (c == NULL)
1866 packet_disconnect("Received close confirmation for "
1867 "out-of-range channel %d.", id);
1868 if (c->type != SSH_CHANNEL_CLOSED)
1869 packet_disconnect("Received close confirmation for "
1870 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001871 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001872}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001873
Damien Miller4af51302000-04-16 11:18:38 +10001874void
Damien Miller62cee002000-09-23 17:15:56 +11001875channel_input_open_confirmation(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001876{
Damien Millerb38eff82000-04-01 11:09:21 +10001877 int id, remote_id;
1878 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001879
Damien Miller33b13562000-04-04 14:38:59 +10001880 if (!compat20)
1881 packet_integrity_check(plen, 4 + 4, type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001882
Damien Millerb38eff82000-04-01 11:09:21 +10001883 id = packet_get_int();
1884 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001885
Damien Millerb38eff82000-04-01 11:09:21 +10001886 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1887 packet_disconnect("Received open confirmation for "
1888 "non-opening channel %d.", id);
1889 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11001890 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10001891 c->remote_id = remote_id;
1892 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10001893
1894 if (compat20) {
1895 c->remote_window = packet_get_int();
1896 c->remote_maxpacket = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10001897 packet_done();
Damien Miller33b13562000-04-04 14:38:59 +10001898 if (c->cb_fn != NULL && c->cb_event == type) {
Damien Millerd3444942000-09-30 14:20:03 +11001899 debug2("callback start");
Damien Miller33b13562000-04-04 14:38:59 +10001900 c->cb_fn(c->self, c->cb_arg);
Damien Millerd3444942000-09-30 14:20:03 +11001901 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001902 }
1903 debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1904 c->remote_window, c->remote_maxpacket);
1905 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001906}
1907
Ben Lindstrombba81212001-06-25 05:01:22 +00001908static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00001909reason2txt(int reason)
1910{
1911 switch(reason) {
1912 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
1913 return "administratively prohibited";
1914 case SSH2_OPEN_CONNECT_FAILED:
1915 return "connect failed";
1916 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
1917 return "unknown channel type";
1918 case SSH2_OPEN_RESOURCE_SHORTAGE:
1919 return "resource shortage";
1920 }
Ben Lindstrome2595442001-06-05 20:01:39 +00001921 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00001922}
1923
Damien Miller4af51302000-04-16 11:18:38 +10001924void
Damien Miller62cee002000-09-23 17:15:56 +11001925channel_input_open_failure(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001926{
Kevin Steves12057502001-02-05 14:54:34 +00001927 int id, reason;
1928 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10001929 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001930
Damien Miller33b13562000-04-04 14:38:59 +10001931 if (!compat20)
1932 packet_integrity_check(plen, 4, type);
Damien Millerb38eff82000-04-01 11:09:21 +10001933
1934 id = packet_get_int();
1935 c = channel_lookup(id);
1936
1937 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1938 packet_disconnect("Received open failure for "
1939 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10001940 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00001941 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00001942 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00001943 msg = packet_get_string(NULL);
1944 lang = packet_get_string(NULL);
1945 }
Damien Miller4af51302000-04-16 11:18:38 +10001946 packet_done();
Ben Lindstrom69128662001-05-08 20:07:39 +00001947 log("channel %d: open failed: %s%s%s", id,
1948 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00001949 if (msg != NULL)
1950 xfree(msg);
1951 if (lang != NULL)
1952 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10001953 }
Damien Miller95def091999-11-25 00:26:21 +11001954 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001955 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001956}
1957
Damien Miller33b13562000-04-04 14:38:59 +10001958void
Damien Miller62cee002000-09-23 17:15:56 +11001959channel_input_channel_request(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001960{
1961 int id;
1962 Channel *c;
1963
1964 id = packet_get_int();
1965 c = channel_lookup(id);
1966
1967 if (c == NULL ||
1968 (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
1969 packet_disconnect("Received request for "
1970 "non-open channel %d.", id);
1971 if (c->cb_fn != NULL && c->cb_event == type) {
Damien Millerd3444942000-09-30 14:20:03 +11001972 debug2("callback start");
Damien Miller33b13562000-04-04 14:38:59 +10001973 c->cb_fn(c->self, c->cb_arg);
Damien Millerd3444942000-09-30 14:20:03 +11001974 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001975 } else {
1976 char *service = packet_get_string(NULL);
Ben Lindstromcc74df72001-03-05 06:20:14 +00001977 debug("channel %d: rcvd request for %s", c->self, service);
Damien Millerd3444942000-09-30 14:20:03 +11001978 debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
Damien Miller33b13562000-04-04 14:38:59 +10001979 xfree(service);
1980 }
1981}
1982
Damien Miller4af51302000-04-16 11:18:38 +10001983void
Damien Miller62cee002000-09-23 17:15:56 +11001984channel_input_window_adjust(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001985{
1986 Channel *c;
1987 int id, adjust;
1988
1989 if (!compat20)
1990 return;
1991
1992 /* Get the channel number and verify it. */
1993 id = packet_get_int();
1994 c = channel_lookup(id);
1995
1996 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
1997 log("Received window adjust for "
1998 "non-open channel %d.", id);
1999 return;
2000 }
2001 adjust = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10002002 packet_done();
Damien Millerd3444942000-09-30 14:20:03 +11002003 debug2("channel %d: rcvd adjust %d", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002004 c->remote_window += adjust;
2005}
2006
Damien Miller4af51302000-04-16 11:18:38 +10002007void
Ben Lindstrome9c99912001-06-09 00:41:05 +00002008channel_input_port_open(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002009{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002010 Channel *c = NULL;
2011 u_short host_port;
2012 char *host, *originator_string;
2013 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002014
Ben Lindstrome9c99912001-06-09 00:41:05 +00002015 remote_id = packet_get_int();
2016 host = packet_get_string(NULL);
2017 host_port = packet_get_int();
2018
2019 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2020 originator_string = packet_get_string(NULL);
2021 } else {
2022 originator_string = xstrdup("unknown (remote did not supply name)");
2023 }
2024 packet_done();
2025 sock = channel_connect_to(host, host_port);
2026 if (sock != -1) {
2027 c = channel_new("connected socket",
2028 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2029 originator_string, 1);
2030 if (c == NULL) {
2031 error("channel_input_port_open: channel_new failed");
2032 close(sock);
2033 } else {
2034 c->remote_id = remote_id;
Damien Miller95def091999-11-25 00:26:21 +11002035 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002036 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002037 if (c == NULL) {
2038 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2039 packet_put_int(remote_id);
2040 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002041 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002042 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002043}
2044
2045
Ben Lindstrome9c99912001-06-09 00:41:05 +00002046/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002047
Ben Lindstrom908afed2001-10-03 17:34:59 +00002048void
2049channel_set_af(int af)
2050{
2051 IPv4or6 = af;
2052}
2053
Damien Miller5428f641999-11-25 11:54:57 +11002054/*
2055 * Initiate forwarding of connections to local port "port" through the secure
2056 * channel to host:port from remote side.
2057 */
Kevin Steves12057502001-02-05 14:54:34 +00002058int
Damien Miller0bc1bd82000-11-13 22:57:25 +11002059channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
2060 u_short port_to_connect, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002061{
Kevin Steves12057502001-02-05 14:54:34 +00002062 return channel_request_forwarding(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002063 NULL, listen_port,
2064 host_to_connect, port_to_connect,
2065 gateway_ports, /*remote_fwd*/ 0);
2066}
2067
2068/*
2069 * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
2070 * (SSH_CHANNEL_RPORT_LISTENER).
2071 */
Kevin Steves12057502001-02-05 14:54:34 +00002072int
Damien Miller0bc1bd82000-11-13 22:57:25 +11002073channel_request_forwarding(
2074 const char *listen_address, u_short listen_port,
2075 const char *host_to_connect, u_short port_to_connect,
2076 int gateway_ports, int remote_fwd)
2077{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002078 Channel *c;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002079 int success, sock, on = 1, type;
Damien Miller34132e52000-01-14 15:45:46 +11002080 struct addrinfo hints, *ai, *aitop;
2081 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller0bc1bd82000-11-13 22:57:25 +11002082 const char *host;
Damien Miller5428f641999-11-25 11:54:57 +11002083 struct linger linger;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002084
Kevin Steves12057502001-02-05 14:54:34 +00002085 success = 0;
2086
Damien Miller0bc1bd82000-11-13 22:57:25 +11002087 if (remote_fwd) {
2088 host = listen_address;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002089 type = SSH_CHANNEL_RPORT_LISTENER;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002090 } else {
2091 host = host_to_connect;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002092 type = SSH_CHANNEL_PORT_LISTENER;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002093 }
2094
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002095 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002096 error("Forward host name too long.");
2097 return success;
2098 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002099
Damien Miller0bc1bd82000-11-13 22:57:25 +11002100 /* XXX listen_address is currently ignored */
Damien Miller5428f641999-11-25 11:54:57 +11002101 /*
Damien Miller34132e52000-01-14 15:45:46 +11002102 * getaddrinfo returns a loopback address if the hostname is
2103 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002104 */
Damien Miller34132e52000-01-14 15:45:46 +11002105 memset(&hints, 0, sizeof(hints));
2106 hints.ai_family = IPv4or6;
2107 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
2108 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002109 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002110 if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
2111 packet_disconnect("getaddrinfo: fatal error");
Damien Miller5428f641999-11-25 11:54:57 +11002112
Damien Miller34132e52000-01-14 15:45:46 +11002113 for (ai = aitop; ai; ai = ai->ai_next) {
2114 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2115 continue;
2116 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2117 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11002118 error("channel_request_forwarding: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002119 continue;
2120 }
2121 /* Create a port to listen for the host. */
2122 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2123 if (sock < 0) {
2124 /* this is no error since kernel may not support ipv6 */
2125 verbose("socket: %.100s", strerror(errno));
2126 continue;
2127 }
2128 /*
2129 * Set socket options. We would like the socket to disappear
2130 * as soon as it has been closed for whatever reason.
2131 */
2132 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
2133 linger.l_onoff = 1;
2134 linger.l_linger = 5;
2135 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
2136 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002137
Damien Miller34132e52000-01-14 15:45:46 +11002138 /* Bind the socket to the address. */
2139 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2140 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002141 if (!ai->ai_next)
2142 error("bind: %.100s", strerror(errno));
2143 else
2144 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002145
Damien Miller34132e52000-01-14 15:45:46 +11002146 close(sock);
2147 continue;
2148 }
2149 /* Start listening for connections on the socket. */
2150 if (listen(sock, 5) < 0) {
2151 error("listen: %.100s", strerror(errno));
2152 close(sock);
2153 continue;
2154 }
2155 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002156 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002157 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002158 0, xstrdup("port listener"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002159 if (c == NULL) {
2160 error("channel_request_forwarding: channel_new failed");
2161 close(sock);
2162 continue;
2163 }
2164 strlcpy(c->path, host, sizeof(c->path));
2165 c->host_port = port_to_connect;
2166 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002167 success = 1;
2168 }
2169 if (success == 0)
Kevin Steves12057502001-02-05 14:54:34 +00002170 error("channel_request_forwarding: cannot listen to port: %d",
2171 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002172 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002173 return success;
Damien Miller95def091999-11-25 00:26:21 +11002174}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002175
Damien Miller5428f641999-11-25 11:54:57 +11002176/*
2177 * Initiate forwarding of connections to port "port" on remote host through
2178 * the secure channel to host:port from local side.
2179 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002180
Damien Miller4af51302000-04-16 11:18:38 +10002181void
Damien Miller0bc1bd82000-11-13 22:57:25 +11002182channel_request_remote_forwarding(u_short listen_port,
2183 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002184{
Damien Miller0bc1bd82000-11-13 22:57:25 +11002185 int payload_len, type, success = 0;
2186
Damien Miller95def091999-11-25 00:26:21 +11002187 /* Record locally that connection to this host/port is permitted. */
2188 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2189 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002190
Damien Miller95def091999-11-25 00:26:21 +11002191 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002192 if (compat20) {
2193 const char *address_to_bind = "0.0.0.0";
2194 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2195 packet_put_cstring("tcpip-forward");
2196 packet_put_char(0); /* boolean: want reply */
2197 packet_put_cstring(address_to_bind);
2198 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002199 packet_send();
2200 packet_write_wait();
2201 /* Assume that server accepts the request */
2202 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002203 } else {
2204 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002205 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002206 packet_put_cstring(host_to_connect);
2207 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002208 packet_send();
2209 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002210
2211 /* Wait for response from the remote side. */
2212 type = packet_read(&payload_len);
2213 switch (type) {
2214 case SSH_SMSG_SUCCESS:
2215 success = 1;
2216 break;
2217 case SSH_SMSG_FAILURE:
2218 log("Warning: Server denied remote port forwarding.");
2219 break;
2220 default:
2221 /* Unknown packet */
2222 packet_disconnect("Protocol error for port forward request:"
2223 "received packet type %d.", type);
2224 }
2225 }
2226 if (success) {
2227 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2228 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2229 permitted_opens[num_permitted_opens].listen_port = listen_port;
2230 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002231 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002232}
2233
Damien Miller5428f641999-11-25 11:54:57 +11002234/*
2235 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2236 * listening for the port, and sends back a success reply (or disconnect
2237 * message if there was an error). This never returns if there was an error.
2238 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002239
Damien Miller4af51302000-04-16 11:18:38 +10002240void
Damien Millere247cc42000-05-07 12:03:14 +10002241channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002242{
Damien Milleraae6c611999-12-06 11:47:28 +11002243 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002244 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002245
Damien Miller95def091999-11-25 00:26:21 +11002246 /* Get arguments from the packet. */
2247 port = packet_get_int();
2248 hostname = packet_get_string(NULL);
2249 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002250
Damien Millerbac2d8a2000-09-05 16:13:06 +11002251#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002252 /*
2253 * Check that an unprivileged user is not trying to forward a
2254 * privileged port.
2255 */
Damien Miller95def091999-11-25 00:26:21 +11002256 if (port < IPPORT_RESERVED && !is_root)
2257 packet_disconnect("Requested forwarding of port %d but user is not root.",
2258 port);
Damien Millerbac2d8a2000-09-05 16:13:06 +11002259#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +11002260 /* Initiate forwarding */
Damien Millere247cc42000-05-07 12:03:14 +10002261 channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002262
2263 /* Free the argument string. */
2264 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002265}
2266
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002267/*
2268 * Permits opening to any host/port if permitted_opens[] is empty. This is
2269 * usually called by the server, because the user could connect to any port
2270 * anyway, and the server has no way to know but to trust the client anyway.
2271 */
2272void
2273channel_permit_all_opens()
2274{
2275 if (num_permitted_opens == 0)
2276 all_opens_permitted = 1;
2277}
2278
Ben Lindstroma3700052001-04-05 23:26:32 +00002279void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002280channel_add_permitted_opens(char *host, int port)
2281{
2282 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2283 fatal("channel_request_remote_forwarding: too many forwards");
2284 debug("allow port forwarding to host %s port %d", host, port);
2285
2286 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2287 permitted_opens[num_permitted_opens].port_to_connect = port;
2288 num_permitted_opens++;
2289
2290 all_opens_permitted = 0;
2291}
2292
Ben Lindstroma3700052001-04-05 23:26:32 +00002293void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002294channel_clear_permitted_opens(void)
2295{
2296 int i;
2297
2298 for (i = 0; i < num_permitted_opens; i++)
2299 xfree(permitted_opens[i].host_to_connect);
2300 num_permitted_opens = 0;
2301
2302}
2303
2304
2305/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002306static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002307connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002308{
Damien Miller34132e52000-01-14 15:45:46 +11002309 struct addrinfo hints, *ai, *aitop;
2310 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2311 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002312 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002313
Damien Miller34132e52000-01-14 15:45:46 +11002314 memset(&hints, 0, sizeof(hints));
2315 hints.ai_family = IPv4or6;
2316 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002317 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002318 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002319 error("connect_to %.100s: unknown host (%s)", host,
2320 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002321 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002322 }
Damien Miller34132e52000-01-14 15:45:46 +11002323 for (ai = aitop; ai; ai = ai->ai_next) {
2324 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2325 continue;
2326 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2327 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002328 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002329 continue;
2330 }
Damien Miller34132e52000-01-14 15:45:46 +11002331 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2332 if (sock < 0) {
2333 error("socket: %.100s", strerror(errno));
2334 continue;
2335 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +00002336 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002337 fatal("connect_to: F_SETFL: %s", strerror(errno));
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002338 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2339 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002340 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002341 strerror(errno));
2342 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002343 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002344 }
2345 break; /* success */
2346
2347 }
2348 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002349 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002350 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002351 return -1;
2352 }
2353 /* success */
2354 return sock;
2355}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002356
Damien Miller0bc1bd82000-11-13 22:57:25 +11002357int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002358channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002359{
2360 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002361
Damien Miller0bc1bd82000-11-13 22:57:25 +11002362 for (i = 0; i < num_permitted_opens; i++)
2363 if (permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002364 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002365 permitted_opens[i].host_to_connect,
2366 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002367 error("WARNING: Server requests forwarding for unknown listen_port %d",
2368 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002369 return -1;
2370}
Damien Millerb38eff82000-04-01 11:09:21 +10002371
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002372/* Check if connecting to that port is permitted and connect. */
2373int
2374channel_connect_to(const char *host, u_short port)
2375{
2376 int i, permit;
2377
2378 permit = all_opens_permitted;
2379 if (!permit) {
2380 for (i = 0; i < num_permitted_opens; i++)
2381 if (permitted_opens[i].port_to_connect == port &&
2382 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2383 permit = 1;
2384
2385 }
2386 if (!permit) {
2387 log("Received request to connect to host %.100s port %d, "
2388 "but the request was denied.", host, port);
2389 return -1;
2390 }
2391 return connect_to(host, port);
2392}
2393
Ben Lindstrome9c99912001-06-09 00:41:05 +00002394/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002395
Damien Miller5428f641999-11-25 11:54:57 +11002396/*
2397 * Creates an internet domain socket for listening for X11 connections.
2398 * Returns a suitable value for the DISPLAY variable, or NULL if an error
2399 * occurs.
2400 */
Damien Miller95def091999-11-25 00:26:21 +11002401char *
Damien Millera34a28b1999-12-14 10:47:15 +11002402x11_create_display_inet(int screen_number, int x11_display_offset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002403{
Damien Milleraae6c611999-12-06 11:47:28 +11002404 int display_number, sock;
2405 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002406 struct addrinfo hints, *ai, *aitop;
2407 char strport[NI_MAXSERV];
2408 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
2409 char display[512];
Damien Miller95def091999-11-25 00:26:21 +11002410 char hostname[MAXHOSTNAMELEN];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002411
Damien Millera34a28b1999-12-14 10:47:15 +11002412 for (display_number = x11_display_offset;
Damien Miller95def091999-11-25 00:26:21 +11002413 display_number < MAX_DISPLAYS;
2414 display_number++) {
2415 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002416 memset(&hints, 0, sizeof(hints));
2417 hints.ai_family = IPv4or6;
2418 hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */
2419 hints.ai_socktype = SOCK_STREAM;
2420 snprintf(strport, sizeof strport, "%d", port);
2421 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2422 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Damien Miller95def091999-11-25 00:26:21 +11002423 return NULL;
2424 }
Damien Miller34132e52000-01-14 15:45:46 +11002425 for (ai = aitop; ai; ai = ai->ai_next) {
2426 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2427 continue;
2428 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2429 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002430 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002431 error("socket: %.100s", strerror(errno));
2432 return NULL;
2433 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002434 debug("x11_create_display_inet: Socket family %d not supported",
2435 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002436 continue;
2437 }
Damien Miller34132e52000-01-14 15:45:46 +11002438 }
2439 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2440 debug("bind port %d: %.100s", port, strerror(errno));
2441 shutdown(sock, SHUT_RDWR);
2442 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002443
2444 if (ai->ai_next)
2445 continue;
2446
Damien Miller34132e52000-01-14 15:45:46 +11002447 for (n = 0; n < num_socks; n++) {
2448 shutdown(socks[n], SHUT_RDWR);
2449 close(socks[n]);
2450 }
2451 num_socks = 0;
2452 break;
2453 }
2454 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002455#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002456 if (num_socks == NUM_SOCKS)
2457 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002458#else
2459 break;
2460#endif
Damien Miller95def091999-11-25 00:26:21 +11002461 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002462 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002463 if (num_socks > 0)
2464 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002465 }
Damien Miller95def091999-11-25 00:26:21 +11002466 if (display_number >= MAX_DISPLAYS) {
2467 error("Failed to allocate internet-domain X11 display socket.");
2468 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002469 }
Damien Miller95def091999-11-25 00:26:21 +11002470 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002471 for (n = 0; n < num_socks; n++) {
2472 sock = socks[n];
2473 if (listen(sock, 5) < 0) {
2474 error("listen: %.100s", strerror(errno));
2475 shutdown(sock, SHUT_RDWR);
2476 close(sock);
2477 return NULL;
2478 }
Damien Miller95def091999-11-25 00:26:21 +11002479 }
Damien Miller34132e52000-01-14 15:45:46 +11002480
Damien Miller95def091999-11-25 00:26:21 +11002481 /* Set up a suitable value for the DISPLAY variable. */
2482 if (gethostname(hostname, sizeof(hostname)) < 0)
2483 fatal("gethostname: %.100s", strerror(errno));
Damien Miller76112de1999-12-21 11:18:08 +11002484
2485#ifdef IPADDR_IN_DISPLAY
Kevin Stevesef4eea92001-02-05 12:42:17 +00002486 /*
Damien Miller76112de1999-12-21 11:18:08 +11002487 * HPUX detects the local hostname in the DISPLAY variable and tries
2488 * to set up a shared memory connection to the server, which it
2489 * incorrectly supposes to be local.
2490 *
2491 * The workaround - as used in later $$H and other programs - is
2492 * is to set display to the host's IP address.
2493 */
2494 {
2495 struct hostent *he;
2496 struct in_addr my_addr;
2497
2498 he = gethostbyname(hostname);
2499 if (he == NULL) {
2500 error("[X11-broken-fwd-hostname-workaround] Could not get "
2501 "IP address for hostname %s.", hostname);
2502
2503 packet_send_debug("[X11-broken-fwd-hostname-workaround]"
2504 "Could not get IP address for hostname %s.", hostname);
2505
2506 shutdown(sock, SHUT_RDWR);
2507 close(sock);
2508
2509 return NULL;
2510 }
2511
2512 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2513
2514 /* Set DISPLAY to <ip address>:screen.display */
Kevin Stevesef4eea92001-02-05 12:42:17 +00002515 snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr),
Kevin Stevesda6cd592000-12-29 18:41:21 +00002516 display_number, screen_number);
Damien Miller76112de1999-12-21 11:18:08 +11002517 }
2518#else /* IPADDR_IN_DISPLAY */
2519 /* Just set DISPLAY to hostname:screen.display */
Damien Miller34132e52000-01-14 15:45:46 +11002520 snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
Kevin Stevesda6cd592000-12-29 18:41:21 +00002521 display_number, screen_number);
Damien Miller76112de1999-12-21 11:18:08 +11002522#endif /* IPADDR_IN_DISPLAY */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002523
Damien Miller34132e52000-01-14 15:45:46 +11002524 /* Allocate a channel for each socket. */
2525 for (n = 0; n < num_socks; n++) {
2526 sock = socks[n];
Damien Millerbd483e72000-04-30 10:00:53 +10002527 (void) channel_new("x11 listener",
2528 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2529 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002530 0, xstrdup("X11 inet listener"), 1);
Damien Miller34132e52000-01-14 15:45:46 +11002531 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002532
Damien Miller95def091999-11-25 00:26:21 +11002533 /* Return a suitable value for the DISPLAY environment variable. */
Damien Miller34132e52000-01-14 15:45:46 +11002534 return xstrdup(display);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002535}
2536
2537#ifndef X_UNIX_PATH
2538#define X_UNIX_PATH "/tmp/.X11-unix/X"
2539#endif
2540
Ben Lindstrombba81212001-06-25 05:01:22 +00002541static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002542connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002543{
Damien Miller95def091999-11-25 00:26:21 +11002544 static const char *const x_sockets[] = {
2545 X_UNIX_PATH "%u",
2546 "/var/X/.X11-unix/X" "%u",
2547 "/usr/spool/sockets/X11/" "%u",
2548 NULL
2549 };
2550 int sock;
2551 struct sockaddr_un addr;
2552 const char *const * path;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002553
Damien Miller95def091999-11-25 00:26:21 +11002554 for (path = x_sockets; *path; ++path) {
2555 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2556 if (sock < 0)
2557 error("socket: %.100s", strerror(errno));
2558 memset(&addr, 0, sizeof(addr));
2559 addr.sun_family = AF_UNIX;
2560 snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
2561 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2562 return sock;
2563 close(sock);
2564 }
2565 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2566 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002567}
2568
Damien Millerbd483e72000-04-30 10:00:53 +10002569int
2570x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002571{
Damien Millerbd483e72000-04-30 10:00:53 +10002572 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002573 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002574 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002575 struct addrinfo hints, *ai, *aitop;
2576 char strport[NI_MAXSERV];
2577 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002578
Damien Miller95def091999-11-25 00:26:21 +11002579 /* Try to open a socket for the local X server. */
2580 display = getenv("DISPLAY");
2581 if (!display) {
2582 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002583 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002584 }
Damien Miller5428f641999-11-25 11:54:57 +11002585 /*
2586 * Now we decode the value of the DISPLAY variable and make a
2587 * connection to the real X server.
2588 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002589
Damien Miller5428f641999-11-25 11:54:57 +11002590 /*
2591 * Check if it is a unix domain socket. Unix domain displays are in
2592 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2593 */
Damien Miller95def091999-11-25 00:26:21 +11002594 if (strncmp(display, "unix:", 5) == 0 ||
2595 display[0] == ':') {
2596 /* Connect to the unix domain socket. */
2597 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2598 error("Could not parse display number from DISPLAY: %.100s",
2599 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002600 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002601 }
2602 /* Create a socket. */
2603 sock = connect_local_xsocket(display_number);
2604 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002605 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002606
2607 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002608 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002609 }
Damien Miller5428f641999-11-25 11:54:57 +11002610 /*
2611 * Connect to an inet socket. The DISPLAY value is supposedly
2612 * hostname:d[.s], where hostname may also be numeric IP address.
2613 */
Damien Miller95def091999-11-25 00:26:21 +11002614 strncpy(buf, display, sizeof(buf));
2615 buf[sizeof(buf) - 1] = 0;
2616 cp = strchr(buf, ':');
2617 if (!cp) {
2618 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002619 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002620 }
Damien Miller95def091999-11-25 00:26:21 +11002621 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002622 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002623 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2624 error("Could not parse display number from DISPLAY: %.100s",
2625 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002626 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002627 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002628
Damien Miller34132e52000-01-14 15:45:46 +11002629 /* Look up the host address */
2630 memset(&hints, 0, sizeof(hints));
2631 hints.ai_family = IPv4or6;
2632 hints.ai_socktype = SOCK_STREAM;
2633 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2634 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2635 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002636 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002637 }
Damien Miller34132e52000-01-14 15:45:46 +11002638 for (ai = aitop; ai; ai = ai->ai_next) {
2639 /* Create a socket. */
2640 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2641 if (sock < 0) {
2642 debug("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002643 continue;
2644 }
2645 /* Connect it to the display. */
2646 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2647 debug("connect %.100s port %d: %.100s", buf,
2648 6000 + display_number, strerror(errno));
2649 close(sock);
2650 continue;
2651 }
2652 /* Success */
2653 break;
Damien Miller34132e52000-01-14 15:45:46 +11002654 }
Damien Miller34132e52000-01-14 15:45:46 +11002655 freeaddrinfo(aitop);
2656 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002657 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002658 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002659 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002660 }
Damien Millerbd483e72000-04-30 10:00:53 +10002661 return sock;
2662}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002663
Damien Millerbd483e72000-04-30 10:00:53 +10002664/*
2665 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2666 * the remote channel number. We should do whatever we want, and respond
2667 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2668 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002669
Damien Millerbd483e72000-04-30 10:00:53 +10002670void
Damien Miller62cee002000-09-23 17:15:56 +11002671x11_input_open(int type, int plen, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002672{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002673 Channel *c = NULL;
2674 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002675 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002676
2677 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002678
2679 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002680
2681 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002682 remote_host = packet_get_string(NULL);
2683 } else {
2684 remote_host = xstrdup("unknown (remote did not supply name)");
2685 }
2686 packet_done();
Damien Millerbd483e72000-04-30 10:00:53 +10002687
2688 /* Obtain a connection to the real X display. */
2689 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002690 if (sock != -1) {
2691 /* Allocate a channel for this connection. */
2692 c = channel_new("connected x11 socket",
2693 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2694 remote_host, 1);
2695 if (c == NULL) {
2696 error("x11_input_open: channel_new failed");
2697 close(sock);
2698 } else {
2699 c->remote_id = remote_id;
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002700 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002701 }
2702 }
2703 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002704 /* Send refusal to the remote host. */
2705 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002706 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10002707 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10002708 /* Send a confirmation to the remote host. */
2709 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002710 packet_put_int(remote_id);
2711 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10002712 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002713 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002714}
2715
Damien Miller69b69aa2000-10-28 14:19:58 +11002716/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2717void
2718deny_input_open(int type, int plen, void *ctxt)
2719{
2720 int rchan = packet_get_int();
2721 switch(type){
2722 case SSH_SMSG_AGENT_OPEN:
2723 error("Warning: ssh server tried agent forwarding.");
2724 break;
2725 case SSH_SMSG_X11_OPEN:
2726 error("Warning: ssh server tried X11 forwarding.");
2727 break;
2728 default:
2729 error("deny_input_open: type %d plen %d", type, plen);
2730 break;
2731 }
2732 error("Warning: this is probably a break in attempt by a malicious server.");
2733 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2734 packet_put_int(rchan);
2735 packet_send();
2736}
2737
Damien Miller5428f641999-11-25 11:54:57 +11002738/*
2739 * Requests forwarding of X11 connections, generates fake authentication
2740 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00002741 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11002742 */
Damien Miller4af51302000-04-16 11:18:38 +10002743void
Damien Millerbd483e72000-04-30 10:00:53 +10002744x11_request_forwarding_with_spoofing(int client_session_id,
2745 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002746{
Ben Lindstrom46c16222000-12-22 01:43:59 +00002747 u_int data_len = (u_int) strlen(data) / 2;
Ben Lindstromb3211a82001-02-10 22:33:19 +00002748 u_int i, value, len;
Damien Miller95def091999-11-25 00:26:21 +11002749 char *new_data;
2750 int screen_number;
2751 const char *cp;
2752 u_int32_t rand = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002753
Damien Miller95def091999-11-25 00:26:21 +11002754 cp = getenv("DISPLAY");
2755 if (cp)
2756 cp = strchr(cp, ':');
2757 if (cp)
2758 cp = strchr(cp, '.');
2759 if (cp)
2760 screen_number = atoi(cp + 1);
2761 else
2762 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002763
Damien Miller95def091999-11-25 00:26:21 +11002764 /* Save protocol name. */
2765 x11_saved_proto = xstrdup(proto);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002766
Damien Miller5428f641999-11-25 11:54:57 +11002767 /*
2768 * Extract real authentication data and generate fake data of the
2769 * same length.
2770 */
Damien Miller95def091999-11-25 00:26:21 +11002771 x11_saved_data = xmalloc(data_len);
2772 x11_fake_data = xmalloc(data_len);
2773 for (i = 0; i < data_len; i++) {
2774 if (sscanf(data + 2 * i, "%2x", &value) != 1)
2775 fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2776 if (i % 4 == 0)
2777 rand = arc4random();
2778 x11_saved_data[i] = value;
2779 x11_fake_data[i] = rand & 0xff;
2780 rand >>= 8;
2781 }
2782 x11_saved_data_len = data_len;
2783 x11_fake_data_len = data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002784
Damien Miller95def091999-11-25 00:26:21 +11002785 /* Convert the fake data into hex. */
Ben Lindstromb3211a82001-02-10 22:33:19 +00002786 len = 2 * data_len + 1;
2787 new_data = xmalloc(len);
Damien Miller95def091999-11-25 00:26:21 +11002788 for (i = 0; i < data_len; i++)
Ben Lindstromb3211a82001-02-10 22:33:19 +00002789 snprintf(new_data + 2 * i, len - 2 * i,
2790 "%02x", (u_char) x11_fake_data[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002791
Damien Miller95def091999-11-25 00:26:21 +11002792 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10002793 if (compat20) {
2794 channel_request_start(client_session_id, "x11-req", 0);
2795 packet_put_char(0); /* XXX bool single connection */
2796 } else {
2797 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2798 }
2799 packet_put_cstring(proto);
2800 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11002801 packet_put_int(screen_number);
2802 packet_send();
2803 packet_write_wait();
2804 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002805}
2806
Ben Lindstrome9c99912001-06-09 00:41:05 +00002807
2808/* -- agent forwarding */
2809
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002810/* Sends a message to the server to request authentication fd forwarding. */
2811
Damien Miller4af51302000-04-16 11:18:38 +10002812void
Damien Miller95def091999-11-25 00:26:21 +11002813auth_request_forwarding()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002814{
Damien Miller95def091999-11-25 00:26:21 +11002815 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2816 packet_send();
2817 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002818}
2819
Damien Miller5428f641999-11-25 11:54:57 +11002820/*
2821 * Returns the name of the forwarded authentication socket. Returns NULL if
2822 * there is no forwarded authentication socket. The returned value points to
2823 * a static buffer.
2824 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002825
Damien Miller95def091999-11-25 00:26:21 +11002826char *
2827auth_get_socket_name()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002828{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002829 return auth_sock_name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002830}
2831
2832/* removes the agent forwarding socket */
2833
Damien Miller4af51302000-04-16 11:18:38 +10002834void
Ben Lindstrom983c0982001-06-09 01:20:06 +00002835auth_sock_cleanup_proc(void *_pw)
Damien Miller95def091999-11-25 00:26:21 +11002836{
Ben Lindstrom983c0982001-06-09 01:20:06 +00002837 struct passwd *pw = _pw;
2838
Ben Lindstrom838394c2001-06-09 01:11:59 +00002839 if (auth_sock_name) {
Ben Lindstrom983c0982001-06-09 01:20:06 +00002840 temporarily_use_uid(pw);
Ben Lindstrom838394c2001-06-09 01:11:59 +00002841 unlink(auth_sock_name);
2842 rmdir(auth_sock_dir);
2843 auth_sock_name = NULL;
Ben Lindstrom983c0982001-06-09 01:20:06 +00002844 restore_uid();
Ben Lindstrom838394c2001-06-09 01:11:59 +00002845 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002846}
2847
Damien Miller5428f641999-11-25 11:54:57 +11002848/*
Damien Millerd3a18572000-06-07 19:55:44 +10002849 * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
Damien Miller5428f641999-11-25 11:54:57 +11002850 * This starts forwarding authentication requests.
2851 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002852
Damien Millerd3a18572000-06-07 19:55:44 +10002853int
Damien Miller95def091999-11-25 00:26:21 +11002854auth_input_request_forwarding(struct passwd * pw)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002855{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002856 Channel *nc;
2857 int sock;
Damien Miller95def091999-11-25 00:26:21 +11002858 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002859
Ben Lindstrome9c99912001-06-09 00:41:05 +00002860 if (auth_get_socket_name() != NULL) {
2861 error("authentication forwarding requested twice.");
2862 return 0;
2863 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002864
Damien Miller95def091999-11-25 00:26:21 +11002865 /* Temporarily drop privileged uid for mkdir/bind. */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +00002866 temporarily_use_uid(pw);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002867
Damien Miller95def091999-11-25 00:26:21 +11002868 /* Allocate a buffer for the socket name, and format the name. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002869 auth_sock_name = xmalloc(MAXPATHLEN);
2870 auth_sock_dir = xmalloc(MAXPATHLEN);
2871 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002872
Damien Miller95def091999-11-25 00:26:21 +11002873 /* Create private directory for socket */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002874 if (mkdtemp(auth_sock_dir) == NULL) {
2875 packet_send_debug("Agent forwarding disabled: "
2876 "mkdtemp() failed: %.100s", strerror(errno));
Damien Millerd3a18572000-06-07 19:55:44 +10002877 restore_uid();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002878 xfree(auth_sock_name);
2879 xfree(auth_sock_dir);
2880 auth_sock_name = NULL;
2881 auth_sock_dir = NULL;
Damien Millerd3a18572000-06-07 19:55:44 +10002882 return 0;
2883 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002884 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d",
2885 auth_sock_dir, (int) getpid());
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002886
Ben Lindstrom838394c2001-06-09 01:11:59 +00002887 /* delete agent socket on fatal() */
Ben Lindstrom983c0982001-06-09 01:20:06 +00002888 fatal_add_cleanup(auth_sock_cleanup_proc, pw);
Ben Lindstrom838394c2001-06-09 01:11:59 +00002889
Damien Miller95def091999-11-25 00:26:21 +11002890 /* Create the socket. */
2891 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2892 if (sock < 0)
2893 packet_disconnect("socket: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002894
Damien Miller95def091999-11-25 00:26:21 +11002895 /* Bind it to the name. */
2896 memset(&sunaddr, 0, sizeof(sunaddr));
2897 sunaddr.sun_family = AF_UNIX;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002898 strncpy(sunaddr.sun_path, auth_sock_name,
Damien Miller95def091999-11-25 00:26:21 +11002899 sizeof(sunaddr.sun_path));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002900
Damien Miller95def091999-11-25 00:26:21 +11002901 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
2902 packet_disconnect("bind: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002903
Damien Miller95def091999-11-25 00:26:21 +11002904 /* Restore the privileged uid. */
2905 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002906
Damien Miller95def091999-11-25 00:26:21 +11002907 /* Start listening on the socket. */
2908 if (listen(sock, 5) < 0)
2909 packet_disconnect("listen: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002910
Damien Miller95def091999-11-25 00:26:21 +11002911 /* Allocate a channel for the authentication agent socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002912 nc = channel_new("auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11002913 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
2914 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
2915 0, xstrdup("auth socket"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002916 if (nc == NULL) {
2917 error("auth_input_request_forwarding: channel_new failed");
Ben Lindstrom983c0982001-06-09 01:20:06 +00002918 auth_sock_cleanup_proc(pw);
Ben Lindstromdf4981b2001-06-09 01:32:29 +00002919 fatal_remove_cleanup(auth_sock_cleanup_proc, pw);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002920 close(sock);
2921 return 0;
2922 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002923 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
Damien Millerd3a18572000-06-07 19:55:44 +10002924 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002925}
2926
2927/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2928
Damien Miller4af51302000-04-16 11:18:38 +10002929void
Damien Miller62cee002000-09-23 17:15:56 +11002930auth_input_open_request(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002931{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002932 Channel *c = NULL;
2933 int remote_id, sock;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002934 char *name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002935
Damien Millerb38eff82000-04-01 11:09:21 +10002936 packet_integrity_check(plen, 4, type);
2937
Damien Miller95def091999-11-25 00:26:21 +11002938 /* Read the remote channel number from the message. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002939 remote_id = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002940
Damien Miller5428f641999-11-25 11:54:57 +11002941 /*
2942 * Get a connection to the local authentication agent (this may again
2943 * get forwarded).
2944 */
Damien Miller95def091999-11-25 00:26:21 +11002945 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002946
Damien Miller5428f641999-11-25 11:54:57 +11002947 /*
2948 * If we could not connect the agent, send an error message back to
2949 * the server. This should never happen unless the agent dies,
2950 * because authentication forwarding is only enabled if we have an
2951 * agent.
2952 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002953 if (sock >= 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00002954 name = xstrdup("authentication agent connection");
2955 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
2956 -1, 0, 0, 0, name, 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002957 if (c == NULL) {
2958 error("auth_input_open_request: channel_new failed");
Ben Lindstrome9c99912001-06-09 00:41:05 +00002959 xfree(name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002960 close(sock);
2961 } else {
2962 c->remote_id = remote_id;
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002963 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002964 }
Damien Miller95def091999-11-25 00:26:21 +11002965 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002966 if (c == NULL) {
2967 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2968 packet_put_int(remote_id);
2969 } else {
2970 /* Send a confirmation to the remote host. */
2971 debug("Forwarding authentication connection.");
2972 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2973 packet_put_int(remote_id);
2974 packet_put_int(c->self);
2975 }
Damien Miller95def091999-11-25 00:26:21 +11002976 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002977}