blob: 3ac690135ca3eaa89d1b320bfa4c302dec82a720 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * This file contains functions for generic socket connection forwarding.
6 * There is also code for initiating connection forwarding for X11 connections,
7 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10008 *
Damien Millere4340be2000-09-16 13:29:08 +11009 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose. Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
14 *
Damien Miller33b13562000-04-04 14:38:59 +100015 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110016 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110017 * Copyright (c) 1999 Dug Song. All rights reserved.
18 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110039 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41#include "includes.h"
Damien Miller2797f7f2002-04-23 21:09:44 +100042RCSID("$OpenBSD: channels.c,v 1.173 2002/04/22 21:04:52 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"
Damien Miller3afe3752001-12-21 12:39:51 +110057#include "pathnames.h"
Damien Miller994cf142000-07-21 10:19:44 +100058
Damien Millerd4a8b7e1999-10-27 13:42:43 +100059
Ben Lindstrome9c99912001-06-09 00:41:05 +000060/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100061
Damien Miller5428f641999-11-25 11:54:57 +110062/*
63 * Pointer to an array containing all allocated channels. The array is
64 * dynamically extended as needed.
65 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000066static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100067
Damien Miller5428f641999-11-25 11:54:57 +110068/*
69 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000070 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110071 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100072static int channels_alloc = 0;
73
Damien Miller5428f641999-11-25 11:54:57 +110074/*
75 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000076 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110077 */
Damien Miller5e953212001-01-30 09:14:00 +110078static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080
Ben Lindstrome9c99912001-06-09 00:41:05 +000081/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100082
Damien Miller5428f641999-11-25 11:54:57 +110083/*
84 * Data structure for storing which hosts are permitted for forward requests.
85 * The local sides of any remote forwards are stored in this array to prevent
86 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
87 * network (which might be behind a firewall).
88 */
Damien Miller95def091999-11-25 00:26:21 +110089typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +100090 char *host_to_connect; /* Connect to 'host'. */
91 u_short port_to_connect; /* Connect to 'port'. */
92 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100093} ForwardPermission;
94
95/* List of all permitted host/port pairs to connect. */
96static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +000097
Damien Millerd4a8b7e1999-10-27 13:42:43 +100098/* Number of permitted host/port pairs in the array. */
99static int num_permitted_opens = 0;
Damien Miller5428f641999-11-25 11:54:57 +1100100/*
101 * If this is true, all opens are permitted. This is the case on the server
102 * on which we have to trust the client anyway, and the user could do
103 * anything after logging in anyway.
104 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000105static int all_opens_permitted = 0;
106
Ben Lindstrome9c99912001-06-09 00:41:05 +0000107
108/* -- X11 forwarding */
109
110/* Maximum number of fake X11 displays to try. */
111#define MAX_DISPLAYS 1000
112
113/* Saved X11 authentication protocol name. */
114static char *x11_saved_proto = NULL;
115
116/* Saved X11 authentication data. This is the real data. */
117static char *x11_saved_data = NULL;
118static u_int x11_saved_data_len = 0;
119
120/*
121 * Fake X11 authentication data. This is what the server will be sending us;
122 * we should replace any occurrences of this by the real data.
123 */
124static char *x11_fake_data = NULL;
125static u_int x11_fake_data_len;
126
127
128/* -- agent forwarding */
129
130#define NUM_SOCKS 10
131
132/* Name and directory of socket for authentication agent forwarding. */
133static char *auth_sock_name = NULL;
134static char *auth_sock_dir = NULL;
135
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000136/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000137static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000138
Ben Lindstrome9c99912001-06-09 00:41:05 +0000139/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000140static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000141
Ben Lindstrome9c99912001-06-09 00:41:05 +0000142/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000143
144Channel *
145channel_lookup(int id)
146{
147 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000148
Ben Lindstrom79548872002-03-05 01:57:44 +0000149 if (id < 0 || id >= channels_alloc) {
Damien Millerb38eff82000-04-01 11:09:21 +1000150 log("channel_lookup: %d: bad id", id);
151 return NULL;
152 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000153 c = channels[id];
154 if (c == NULL) {
Damien Millerb38eff82000-04-01 11:09:21 +1000155 log("channel_lookup: %d: bad id: channel free", id);
156 return NULL;
157 }
158 return c;
159}
160
Damien Miller5428f641999-11-25 11:54:57 +1100161/*
Damien Millere247cc42000-05-07 12:03:14 +1000162 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000163 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100164 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000165
Ben Lindstrombba81212001-06-25 05:01:22 +0000166static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100167channel_register_fds(Channel *c, int rfd, int wfd, int efd,
168 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000169{
Damien Miller95def091999-11-25 00:26:21 +1100170 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100171 channel_max_fd = MAX(channel_max_fd, rfd);
172 channel_max_fd = MAX(channel_max_fd, wfd);
173 channel_max_fd = MAX(channel_max_fd, efd);
174
Damien Miller5428f641999-11-25 11:54:57 +1100175 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000176
Damien Miller6f83b8e2000-05-02 09:23:45 +1000177 c->rfd = rfd;
178 c->wfd = wfd;
179 c->sock = (rfd == wfd) ? rfd : -1;
180 c->efd = efd;
181 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100182
Damien Miller79438cc2001-02-16 12:34:57 +1100183 /* XXX ugly hack: nonblock is only set by the server */
184 if (nonblock && isatty(c->rfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000185 debug("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100186 c->isatty = 1;
187 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000188 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100189 c->self, c->wfd);
190 }
191 } else {
192 c->isatty = 0;
193 }
194
Damien Miller69b69aa2000-10-28 14:19:58 +1100195 /* enable nonblocking mode */
196 if (nonblock) {
197 if (rfd != -1)
198 set_nonblock(rfd);
199 if (wfd != -1)
200 set_nonblock(wfd);
201 if (efd != -1)
202 set_nonblock(efd);
203 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000204}
205
206/*
207 * Allocate a new channel object and set its type and socket. This will cause
208 * remote_name to be freed.
209 */
210
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000211Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000212channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Damien Miller69b69aa2000-10-28 14:19:58 +1100213 int window, int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000214{
215 int i, found;
216 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000217
Damien Miller95def091999-11-25 00:26:21 +1100218 /* Do initial allocation if this is the first call. */
219 if (channels_alloc == 0) {
220 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 Miller5144df92002-01-22 23:28:45 +1100248 c->ostate = CHAN_OUTPUT_OPEN;
249 c->istate = CHAN_INPUT_OPEN;
250 c->flags = 0;
Damien Miller69b69aa2000-10-28 14:19:58 +1100251 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100252 c->self = found;
253 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000254 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000255 c->local_window = window;
256 c->local_window_max = window;
257 c->local_consumed = 0;
258 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100259 c->remote_id = -1;
260 c->remote_name = remote_name;
Damien Millerb38eff82000-04-01 11:09:21 +1000261 c->remote_window = 0;
262 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000263 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100264 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000265 c->detach_user = NULL;
Damien Miller67f0bc02002-02-05 12:23:08 +1100266 c->confirm = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000267 c->input_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100268 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000269 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000270}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000271
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000272static int
273channel_find_maxfd(void)
274{
275 int i, max = 0;
276 Channel *c;
277
278 for (i = 0; i < channels_alloc; i++) {
279 c = channels[i];
280 if (c != NULL) {
281 max = MAX(max, c->rfd);
282 max = MAX(max, c->wfd);
283 max = MAX(max, c->efd);
284 }
285 }
286 return max;
287}
288
289int
290channel_close_fd(int *fdp)
291{
292 int ret = 0, fd = *fdp;
293
294 if (fd != -1) {
295 ret = close(fd);
296 *fdp = -1;
297 if (fd == channel_max_fd)
298 channel_max_fd = channel_find_maxfd();
299 }
300 return ret;
301}
302
Damien Miller6f83b8e2000-05-02 09:23:45 +1000303/* Close all channel fd/socket. */
304
Ben Lindstrombba81212001-06-25 05:01:22 +0000305static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000306channel_close_fds(Channel *c)
307{
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000308 debug3("channel_close_fds: channel %d: r %d w %d e %d",
309 c->self, c->rfd, c->wfd, c->efd);
310
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000311 channel_close_fd(&c->sock);
312 channel_close_fd(&c->rfd);
313 channel_close_fd(&c->wfd);
314 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000315}
316
317/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000318
Damien Miller4af51302000-04-16 11:18:38 +1000319void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000320channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000321{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000322 char *s;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000323 int i, n;
324
325 for (n = 0, i = 0; i < channels_alloc; i++)
326 if (channels[i])
327 n++;
Ben Lindstrom4c247552001-06-05 20:56:47 +0000328 debug("channel_free: channel %d: %s, nchannels %d", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000329 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000330
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000331 s = channel_open_message();
Ben Lindstrom4c247552001-06-05 20:56:47 +0000332 debug3("channel_free: status: %s", s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000333 xfree(s);
334
Damien Miller6f83b8e2000-05-02 09:23:45 +1000335 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000336 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000337 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000338 buffer_free(&c->input);
339 buffer_free(&c->output);
340 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000341 if (c->remote_name) {
342 xfree(c->remote_name);
343 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100344 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000345 channels[c->self] = NULL;
346 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000347}
348
Ben Lindstrome9c99912001-06-09 00:41:05 +0000349void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000350channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000351{
352 int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000353
Ben Lindstrom601e4362001-06-21 03:19:23 +0000354 for (i = 0; i < channels_alloc; i++)
355 if (channels[i] != NULL)
356 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000357}
358
359/*
360 * Closes the sockets/fds of all channels. This is used to close extra file
361 * descriptors after a fork.
362 */
363
364void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000365channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000366{
367 int i;
368
369 for (i = 0; i < channels_alloc; i++)
370 if (channels[i] != NULL)
371 channel_close_fds(channels[i]);
372}
373
374/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000375 * Stop listening to channels.
376 */
377
378void
379channel_stop_listening(void)
380{
381 int i;
382 Channel *c;
383
384 for (i = 0; i < channels_alloc; i++) {
385 c = channels[i];
386 if (c != NULL) {
387 switch (c->type) {
388 case SSH_CHANNEL_AUTH_SOCKET:
389 case SSH_CHANNEL_PORT_LISTENER:
390 case SSH_CHANNEL_RPORT_LISTENER:
391 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000392 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000393 channel_free(c);
394 break;
395 }
396 }
397 }
398}
399
400/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000401 * Returns true if no channel has too much buffered data, and false if one or
402 * more channel is overfull.
403 */
404
405int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000406channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000407{
408 u_int i;
409 Channel *c;
410
411 for (i = 0; i < channels_alloc; i++) {
412 c = channels[i];
413 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000414#if 0
415 if (!compat20 &&
416 buffer_len(&c->input) > packet_get_maxsize()) {
Ben Lindstrome9c99912001-06-09 00:41:05 +0000417 debug("channel %d: big input buffer %d",
418 c->self, buffer_len(&c->input));
419 return 0;
420 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000421#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000422 if (buffer_len(&c->output) > packet_get_maxsize()) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000423 debug("channel %d: big output buffer %d > %d",
424 c->self, buffer_len(&c->output),
425 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000426 return 0;
427 }
428 }
429 }
430 return 1;
431}
432
433/* Returns true if any channel is still open. */
434
435int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000436channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000437{
438 int i;
439 Channel *c;
440
441 for (i = 0; i < channels_alloc; i++) {
442 c = channels[i];
443 if (c == NULL)
444 continue;
445 switch (c->type) {
446 case SSH_CHANNEL_X11_LISTENER:
447 case SSH_CHANNEL_PORT_LISTENER:
448 case SSH_CHANNEL_RPORT_LISTENER:
449 case SSH_CHANNEL_CLOSED:
450 case SSH_CHANNEL_AUTH_SOCKET:
451 case SSH_CHANNEL_DYNAMIC:
452 case SSH_CHANNEL_CONNECTING:
453 case SSH_CHANNEL_ZOMBIE:
454 continue;
455 case SSH_CHANNEL_LARVAL:
456 if (!compat20)
457 fatal("cannot happen: SSH_CHANNEL_LARVAL");
458 continue;
459 case SSH_CHANNEL_OPENING:
460 case SSH_CHANNEL_OPEN:
461 case SSH_CHANNEL_X11_OPEN:
462 return 1;
463 case SSH_CHANNEL_INPUT_DRAINING:
464 case SSH_CHANNEL_OUTPUT_DRAINING:
465 if (!compat13)
466 fatal("cannot happen: OUT_DRAIN");
467 return 1;
468 default:
469 fatal("channel_still_open: bad channel type %d", c->type);
470 /* NOTREACHED */
471 }
472 }
473 return 0;
474}
475
476/* Returns the id of an open channel suitable for keepaliving */
477
478int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000479channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000480{
481 int i;
482 Channel *c;
483
484 for (i = 0; i < channels_alloc; i++) {
485 c = channels[i];
486 if (c == NULL)
487 continue;
488 switch (c->type) {
489 case SSH_CHANNEL_CLOSED:
490 case SSH_CHANNEL_DYNAMIC:
491 case SSH_CHANNEL_X11_LISTENER:
492 case SSH_CHANNEL_PORT_LISTENER:
493 case SSH_CHANNEL_RPORT_LISTENER:
494 case SSH_CHANNEL_OPENING:
495 case SSH_CHANNEL_CONNECTING:
496 case SSH_CHANNEL_ZOMBIE:
497 continue;
498 case SSH_CHANNEL_LARVAL:
499 case SSH_CHANNEL_AUTH_SOCKET:
500 case SSH_CHANNEL_OPEN:
501 case SSH_CHANNEL_X11_OPEN:
502 return i;
503 case SSH_CHANNEL_INPUT_DRAINING:
504 case SSH_CHANNEL_OUTPUT_DRAINING:
505 if (!compat13)
506 fatal("cannot happen: OUT_DRAIN");
507 return i;
508 default:
509 fatal("channel_find_open: bad channel type %d", c->type);
510 /* NOTREACHED */
511 }
512 }
513 return -1;
514}
515
516
517/*
518 * Returns a message describing the currently open forwarded connections,
519 * suitable for sending to the client. The message contains crlf pairs for
520 * newlines.
521 */
522
523char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000524channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000525{
526 Buffer buffer;
527 Channel *c;
528 char buf[1024], *cp;
529 int i;
530
531 buffer_init(&buffer);
532 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
533 buffer_append(&buffer, buf, strlen(buf));
534 for (i = 0; i < channels_alloc; i++) {
535 c = channels[i];
536 if (c == NULL)
537 continue;
538 switch (c->type) {
539 case SSH_CHANNEL_X11_LISTENER:
540 case SSH_CHANNEL_PORT_LISTENER:
541 case SSH_CHANNEL_RPORT_LISTENER:
542 case SSH_CHANNEL_CLOSED:
543 case SSH_CHANNEL_AUTH_SOCKET:
544 case SSH_CHANNEL_ZOMBIE:
545 continue;
546 case SSH_CHANNEL_LARVAL:
547 case SSH_CHANNEL_OPENING:
548 case SSH_CHANNEL_CONNECTING:
549 case SSH_CHANNEL_DYNAMIC:
550 case SSH_CHANNEL_OPEN:
551 case SSH_CHANNEL_X11_OPEN:
552 case SSH_CHANNEL_INPUT_DRAINING:
553 case SSH_CHANNEL_OUTPUT_DRAINING:
554 snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
555 c->self, c->remote_name,
556 c->type, c->remote_id,
557 c->istate, buffer_len(&c->input),
558 c->ostate, buffer_len(&c->output),
559 c->rfd, c->wfd);
560 buffer_append(&buffer, buf, strlen(buf));
561 continue;
562 default:
563 fatal("channel_open_message: bad channel type %d", c->type);
564 /* NOTREACHED */
565 }
566 }
567 buffer_append(&buffer, "\0", 1);
568 cp = xstrdup(buffer_ptr(&buffer));
569 buffer_free(&buffer);
570 return cp;
571}
572
573void
574channel_send_open(int id)
575{
576 Channel *c = channel_lookup(id);
577 if (c == NULL) {
578 log("channel_send_open: %d: bad id", id);
579 return;
580 }
581 debug("send channel open %d", id);
582 packet_start(SSH2_MSG_CHANNEL_OPEN);
583 packet_put_cstring(c->ctype);
584 packet_put_int(c->self);
585 packet_put_int(c->local_window);
586 packet_put_int(c->local_maxpacket);
587 packet_send();
588}
589
590void
Damien Millera500cd62002-02-08 22:04:26 +1100591channel_request_start(int local_id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000592{
Damien Millera500cd62002-02-08 22:04:26 +1100593 Channel *c = channel_lookup(local_id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000594 if (c == NULL) {
Damien Millera500cd62002-02-08 22:04:26 +1100595 log("channel_request_start: %d: unknown channel id", local_id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000596 return;
597 }
Damien Millera500cd62002-02-08 22:04:26 +1100598 debug("channel request %d: %s", local_id, service) ;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000599 packet_start(SSH2_MSG_CHANNEL_REQUEST);
600 packet_put_int(c->remote_id);
601 packet_put_cstring(service);
602 packet_put_char(wantconfirm);
603}
604void
Damien Miller67f0bc02002-02-05 12:23:08 +1100605channel_register_confirm(int id, channel_callback_fn *fn)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000606{
607 Channel *c = channel_lookup(id);
608 if (c == NULL) {
Damien Miller67f0bc02002-02-05 12:23:08 +1100609 log("channel_register_comfirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000610 return;
611 }
Damien Miller67f0bc02002-02-05 12:23:08 +1100612 c->confirm = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000613}
614void
615channel_register_cleanup(int id, channel_callback_fn *fn)
616{
617 Channel *c = channel_lookup(id);
618 if (c == NULL) {
619 log("channel_register_cleanup: %d: bad id", id);
620 return;
621 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000622 c->detach_user = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000623}
624void
625channel_cancel_cleanup(int id)
626{
627 Channel *c = channel_lookup(id);
628 if (c == NULL) {
629 log("channel_cancel_cleanup: %d: bad id", id);
630 return;
631 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000632 c->detach_user = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000633}
634void
635channel_register_filter(int id, channel_filter_fn *fn)
636{
637 Channel *c = channel_lookup(id);
638 if (c == NULL) {
639 log("channel_register_filter: %d: bad id", id);
640 return;
641 }
642 c->input_filter = fn;
643}
644
645void
646channel_set_fds(int id, int rfd, int wfd, int efd,
Damien Miller2aa0c192002-02-19 15:20:08 +1100647 int extusage, int nonblock, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000648{
649 Channel *c = channel_lookup(id);
650 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
651 fatal("channel_activate for non-larval channel %d.", id);
652 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
653 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100654 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000655 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
656 packet_put_int(c->remote_id);
657 packet_put_int(c->local_window);
658 packet_send();
659}
660
Damien Miller5428f641999-11-25 11:54:57 +1100661/*
Damien Millerb38eff82000-04-01 11:09:21 +1000662 * 'channel_pre*' are called just before select() to add any bits relevant to
663 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100664 */
Damien Millerb38eff82000-04-01 11:09:21 +1000665/*
666 * 'channel_post*': perform any appropriate operations for channels which
667 * have events pending.
668 */
669typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
670chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
671chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
672
Ben Lindstrombba81212001-06-25 05:01:22 +0000673static void
Damien Millerb38eff82000-04-01 11:09:21 +1000674channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
675{
676 FD_SET(c->sock, readset);
677}
678
Ben Lindstrombba81212001-06-25 05:01:22 +0000679static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000680channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
681{
682 debug3("channel %d: waiting for connection", c->self);
683 FD_SET(c->sock, writeset);
684}
685
Ben Lindstrombba81212001-06-25 05:01:22 +0000686static void
Damien Millerb38eff82000-04-01 11:09:21 +1000687channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
688{
689 if (buffer_len(&c->input) < packet_get_maxsize())
690 FD_SET(c->sock, readset);
691 if (buffer_len(&c->output) > 0)
692 FD_SET(c->sock, writeset);
693}
694
Ben Lindstrombba81212001-06-25 05:01:22 +0000695static void
Damien Millerde6987c2002-01-22 23:20:40 +1100696channel_pre_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000697{
Damien Millerde6987c2002-01-22 23:20:40 +1100698 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000699
Damien Miller33b13562000-04-04 14:38:59 +1000700 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100701 limit > 0 &&
702 buffer_len(&c->input) < limit)
Damien Miller33b13562000-04-04 14:38:59 +1000703 FD_SET(c->rfd, readset);
704 if (c->ostate == CHAN_OUTPUT_OPEN ||
705 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
706 if (buffer_len(&c->output) > 0) {
707 FD_SET(c->wfd, writeset);
708 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000709 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
710 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
711 c->self, c->efd, buffer_len(&c->extended));
712 else
713 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000714 }
715 }
716 /** XXX check close conditions, too */
Damien Millerde6987c2002-01-22 23:20:40 +1100717 if (compat20 && c->efd != -1) {
Damien Miller33b13562000-04-04 14:38:59 +1000718 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
719 buffer_len(&c->extended) > 0)
720 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000721 else if (!(c->flags & CHAN_EOF_SENT) &&
722 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000723 buffer_len(&c->extended) < c->remote_window)
724 FD_SET(c->efd, readset);
725 }
726}
727
Ben Lindstrombba81212001-06-25 05:01:22 +0000728static void
Damien Millerb38eff82000-04-01 11:09:21 +1000729channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
730{
731 if (buffer_len(&c->input) == 0) {
732 packet_start(SSH_MSG_CHANNEL_CLOSE);
733 packet_put_int(c->remote_id);
734 packet_send();
735 c->type = SSH_CHANNEL_CLOSED;
Ben Lindstromc486d882001-04-11 16:08:34 +0000736 debug("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000737 }
738}
739
Ben Lindstrombba81212001-06-25 05:01:22 +0000740static void
Damien Millerb38eff82000-04-01 11:09:21 +1000741channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
742{
743 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000744 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000745 else
Damien Millerb38eff82000-04-01 11:09:21 +1000746 FD_SET(c->sock, writeset);
747}
748
749/*
750 * This is a special state for X11 authentication spoofing. An opened X11
751 * connection (when authentication spoofing is being done) remains in this
752 * state until the first packet has been completely read. The authentication
753 * data in that packet is then substituted by the real data if it matches the
754 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000755 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000756 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000757 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000758static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000759x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000760{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000761 u_char *ucp;
762 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000763
764 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000765 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000766 return 0;
767
768 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100769 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000770 if (ucp[0] == 0x42) { /* Byte order MSB first. */
771 proto_len = 256 * ucp[6] + ucp[7];
772 data_len = 256 * ucp[8] + ucp[9];
773 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
774 proto_len = ucp[6] + 256 * ucp[7];
775 data_len = ucp[8] + 256 * ucp[9];
776 } else {
777 debug("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100778 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000779 return -1;
780 }
781
782 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000783 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000784 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
785 return 0;
786
787 /* Check if authentication protocol matches. */
788 if (proto_len != strlen(x11_saved_proto) ||
789 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
790 debug("X11 connection uses different authentication protocol.");
791 return -1;
792 }
793 /* Check if authentication data matches our fake data. */
794 if (data_len != x11_fake_data_len ||
795 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
796 x11_fake_data, x11_fake_data_len) != 0) {
797 debug("X11 auth data does not match fake data.");
798 return -1;
799 }
800 /* Check fake data length */
801 if (x11_fake_data_len != x11_saved_data_len) {
802 error("X11 fake_data_len %d != saved_data_len %d",
803 x11_fake_data_len, x11_saved_data_len);
804 return -1;
805 }
806 /*
807 * Received authentication protocol and data match
808 * our fake data. Substitute the fake data with real
809 * data.
810 */
811 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
812 x11_saved_data, x11_saved_data_len);
813 return 1;
814}
815
Ben Lindstrombba81212001-06-25 05:01:22 +0000816static void
Damien Millerb38eff82000-04-01 11:09:21 +1000817channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
818{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000819 int ret = x11_open_helper(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000820 if (ret == 1) {
821 /* Start normal processing for the channel. */
822 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000823 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000824 } else if (ret == -1) {
825 /*
826 * We have received an X11 connection that has bad
827 * authentication information.
828 */
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000829 log("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000830 buffer_clear(&c->input);
831 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000832 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000833 c->sock = -1;
834 c->type = SSH_CHANNEL_CLOSED;
835 packet_start(SSH_MSG_CHANNEL_CLOSE);
836 packet_put_int(c->remote_id);
837 packet_send();
838 }
839}
840
Ben Lindstrombba81212001-06-25 05:01:22 +0000841static void
Damien Millerbd483e72000-04-30 10:00:53 +1000842channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000843{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000844 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000845
846 /* c->force_drain = 1; */
847
Damien Millerb38eff82000-04-01 11:09:21 +1000848 if (ret == 1) {
849 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100850 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000851 } else if (ret == -1) {
Damien Millera90fc082002-01-22 23:19:38 +1100852 log("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000853 debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100854 chan_read_failed(c);
855 buffer_clear(&c->input);
856 chan_ibuf_empty(c);
857 buffer_clear(&c->output);
858 /* for proto v1, the peer will send an IEOF */
859 if (compat20)
860 chan_write_failed(c);
861 else
862 c->type = SSH_CHANNEL_OPEN;
Damien Millerb38eff82000-04-01 11:09:21 +1000863 debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
864 }
865}
866
Ben Lindstromb3921512001-04-11 15:57:50 +0000867/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000868static int
Ben Lindstromb3921512001-04-11 15:57:50 +0000869channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000870{
871 u_char *p, *host;
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000872 int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100873 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000874 struct {
875 u_int8_t version;
876 u_int8_t command;
877 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000878 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000879 } s4_req, s4_rsp;
880
Ben Lindstromb3921512001-04-11 15:57:50 +0000881 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000882
883 have = buffer_len(&c->input);
884 len = sizeof(s4_req);
885 if (have < len)
886 return 0;
887 p = buffer_ptr(&c->input);
888 for (found = 0, i = len; i < have; i++) {
889 if (p[i] == '\0') {
890 found = 1;
891 break;
892 }
893 if (i > 1024) {
894 /* the peer is probably sending garbage */
895 debug("channel %d: decode socks4: too long",
896 c->self);
897 return -1;
898 }
899 }
900 if (!found)
901 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000902 buffer_get(&c->input, (char *)&s4_req.version, 1);
903 buffer_get(&c->input, (char *)&s4_req.command, 1);
904 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000905 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000906 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000907 p = buffer_ptr(&c->input);
908 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000909 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000910 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000911 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000912 c->self, len, have);
913 strlcpy(username, p, sizeof(username));
914 buffer_consume(&c->input, len);
915 buffer_consume(&c->input, 1); /* trailing '\0' */
916
Ben Lindstromb3921512001-04-11 15:57:50 +0000917 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000918 strlcpy(c->path, host, sizeof(c->path));
919 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100920
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000921 debug("channel %d: dynamic request: socks4 host %s port %u command %u",
922 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000923
Ben Lindstromb3921512001-04-11 15:57:50 +0000924 if (s4_req.command != 1) {
925 debug("channel %d: cannot handle: socks4 cn %d",
926 c->self, s4_req.command);
927 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000928 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000929 s4_rsp.version = 0; /* vn: 0 for reply */
930 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000931 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000932 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000933 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000934 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000935}
936
Ben Lindstromb3921512001-04-11 15:57:50 +0000937/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +0000938static void
Ben Lindstromb3921512001-04-11 15:57:50 +0000939channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
940{
941 u_char *p;
942 int have, ret;
943
944 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +1000945 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +0000946 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +0000947 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +0000948 /* check if the fixed size part of the packet is in buffer. */
949 if (have < 4) {
950 /* need more */
951 FD_SET(c->sock, readset);
952 return;
953 }
954 /* try to guess the protocol */
955 p = buffer_ptr(&c->input);
956 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000957 case 0x04:
958 ret = channel_decode_socks4(c, readset, writeset);
959 break;
Ben Lindstromb3921512001-04-11 15:57:50 +0000960 default:
961 ret = -1;
962 break;
963 }
964 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000965 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +0000966 } else if (ret == 0) {
967 debug2("channel %d: pre_dynamic: need more", c->self);
968 /* need more */
969 FD_SET(c->sock, readset);
970 } else {
971 /* switch to the next state */
972 c->type = SSH_CHANNEL_OPENING;
973 port_open_helper(c, "direct-tcpip");
974 }
975}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000976
Damien Millerb38eff82000-04-01 11:09:21 +1000977/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000978static void
Damien Millerb38eff82000-04-01 11:09:21 +1000979channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
980{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000981 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +1000982 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +1100983 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +1000984 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +1100985 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +1000986 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +1000987
988 if (FD_ISSET(c->sock, readset)) {
989 debug("X11 connection requested.");
990 addrlen = sizeof(addr);
991 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +1100992 if (c->single_connection) {
993 debug("single_connection: closing X11 listener.");
994 channel_close_fd(&c->sock);
995 chan_mark_dead(c);
996 }
Damien Millerb38eff82000-04-01 11:09:21 +1000997 if (newsock < 0) {
998 error("accept: %.100s", strerror(errno));
999 return;
1000 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001001 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001002 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001003 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001004 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001005 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001006
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001007 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001008 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1009 c->local_window_max, c->local_maxpacket,
Damien Miller69b69aa2000-10-28 14:19:58 +11001010 0, xstrdup(buf), 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001011 if (compat20) {
1012 packet_start(SSH2_MSG_CHANNEL_OPEN);
1013 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001014 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001015 packet_put_int(nc->local_window_max);
1016 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001017 /* originator ipaddr and port */
1018 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001019 if (datafellows & SSH_BUG_X11FWD) {
1020 debug("ssh2 x11 bug compat mode");
1021 } else {
1022 packet_put_int(remote_port);
1023 }
Damien Millerbd483e72000-04-30 10:00:53 +10001024 packet_send();
1025 } else {
1026 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001027 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001028 if (packet_get_protocol_flags() &
1029 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001030 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001031 packet_send();
1032 }
Damien Millerd83ff352001-01-30 09:19:34 +11001033 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001034 }
1035}
1036
Ben Lindstrombba81212001-06-25 05:01:22 +00001037static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001038port_open_helper(Channel *c, char *rtype)
1039{
1040 int direct;
1041 char buf[1024];
1042 char *remote_ipaddr = get_peer_ipaddr(c->sock);
1043 u_short remote_port = get_peer_port(c->sock);
1044
1045 direct = (strcmp(rtype, "direct-tcpip") == 0);
1046
1047 snprintf(buf, sizeof buf,
1048 "%s: listening port %d for %.100s port %d, "
1049 "connect from %.200s port %d",
1050 rtype, c->listening_port, c->path, c->host_port,
1051 remote_ipaddr, remote_port);
1052
1053 xfree(c->remote_name);
1054 c->remote_name = xstrdup(buf);
1055
1056 if (compat20) {
1057 packet_start(SSH2_MSG_CHANNEL_OPEN);
1058 packet_put_cstring(rtype);
1059 packet_put_int(c->self);
1060 packet_put_int(c->local_window_max);
1061 packet_put_int(c->local_maxpacket);
1062 if (direct) {
1063 /* target host, port */
1064 packet_put_cstring(c->path);
1065 packet_put_int(c->host_port);
1066 } else {
1067 /* listen address, port */
1068 packet_put_cstring(c->path);
1069 packet_put_int(c->listening_port);
1070 }
1071 /* originator host and port */
1072 packet_put_cstring(remote_ipaddr);
1073 packet_put_int(remote_port);
1074 packet_send();
1075 } else {
1076 packet_start(SSH_MSG_PORT_OPEN);
1077 packet_put_int(c->self);
1078 packet_put_cstring(c->path);
1079 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001080 if (packet_get_protocol_flags() &
1081 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001082 packet_put_cstring(c->remote_name);
1083 packet_send();
1084 }
1085 xfree(remote_ipaddr);
1086}
1087
Damien Millerb38eff82000-04-01 11:09:21 +10001088/*
1089 * This socket is listening for connections to a forwarded TCP/IP port.
1090 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001091static void
Damien Millerb38eff82000-04-01 11:09:21 +10001092channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1093{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001094 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001095 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001096 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001097 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001098 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001099
Damien Millerb38eff82000-04-01 11:09:21 +10001100 if (FD_ISSET(c->sock, readset)) {
1101 debug("Connection to port %d forwarding "
1102 "to %.100s port %d requested.",
1103 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001104
Damien Miller4623a752001-10-10 15:03:58 +10001105 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1106 nextstate = SSH_CHANNEL_OPENING;
1107 rtype = "forwarded-tcpip";
1108 } else {
1109 if (c->host_port == 0) {
1110 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001111 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001112 } else {
1113 nextstate = SSH_CHANNEL_OPENING;
1114 rtype = "direct-tcpip";
1115 }
1116 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001117
Damien Millerb38eff82000-04-01 11:09:21 +10001118 addrlen = sizeof(addr);
1119 newsock = accept(c->sock, &addr, &addrlen);
1120 if (newsock < 0) {
1121 error("accept: %.100s", strerror(errno));
1122 return;
1123 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001124 set_nodelay(newsock);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001125 nc = channel_new(rtype,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001126 nextstate, newsock, newsock, -1,
Damien Millerb38eff82000-04-01 11:09:21 +10001127 c->local_window_max, c->local_maxpacket,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001128 0, xstrdup(rtype), 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001129 nc->listening_port = c->listening_port;
1130 nc->host_port = c->host_port;
1131 strlcpy(nc->path, c->path, sizeof(nc->path));
1132
Damien Miller4623a752001-10-10 15:03:58 +10001133 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1134 /*
1135 * do not call the channel_post handler until
1136 * this flag has been reset by a pre-handler.
1137 * otherwise the FD_ISSET calls might overflow
1138 */
1139 nc->delayed = 1;
1140 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001141 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001142 }
Damien Millerb38eff82000-04-01 11:09:21 +10001143 }
1144}
1145
1146/*
1147 * This is the authentication agent socket listening for connections from
1148 * clients.
1149 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001150static void
Damien Millerb38eff82000-04-01 11:09:21 +10001151channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1152{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001153 Channel *nc;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001154 char *name;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001155 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001156 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001157 socklen_t addrlen;
1158
1159 if (FD_ISSET(c->sock, readset)) {
1160 addrlen = sizeof(addr);
1161 newsock = accept(c->sock, &addr, &addrlen);
1162 if (newsock < 0) {
1163 error("accept from auth socket: %.100s", strerror(errno));
1164 return;
1165 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001166 name = xstrdup("accepted auth socket");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001167 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001168 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1169 c->local_window_max, c->local_maxpacket,
Ben Lindstrome9c99912001-06-09 00:41:05 +00001170 0, name, 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001171 if (compat20) {
1172 packet_start(SSH2_MSG_CHANNEL_OPEN);
1173 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001174 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001175 packet_put_int(c->local_window_max);
1176 packet_put_int(c->local_maxpacket);
1177 } else {
1178 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001179 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001180 }
Damien Millerb38eff82000-04-01 11:09:21 +10001181 packet_send();
1182 }
1183}
1184
Ben Lindstrombba81212001-06-25 05:01:22 +00001185static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001186channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1187{
Ben Lindstrom69128662001-05-08 20:07:39 +00001188 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001189 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001190
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001191 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001192 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001193 err = errno;
1194 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001195 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001196 if (err == 0) {
1197 debug("channel %d: connected", c->self);
1198 c->type = SSH_CHANNEL_OPEN;
1199 if (compat20) {
1200 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1201 packet_put_int(c->remote_id);
1202 packet_put_int(c->self);
1203 packet_put_int(c->local_window);
1204 packet_put_int(c->local_maxpacket);
1205 } else {
1206 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1207 packet_put_int(c->remote_id);
1208 packet_put_int(c->self);
1209 }
1210 } else {
1211 debug("channel %d: not connected: %s",
1212 c->self, strerror(err));
1213 if (compat20) {
1214 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1215 packet_put_int(c->remote_id);
1216 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1217 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1218 packet_put_cstring(strerror(err));
1219 packet_put_cstring("");
1220 }
1221 } else {
1222 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1223 packet_put_int(c->remote_id);
1224 }
1225 chan_mark_dead(c);
1226 }
1227 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001228 }
1229}
1230
Ben Lindstrombba81212001-06-25 05:01:22 +00001231static int
Damien Millerb38eff82000-04-01 11:09:21 +10001232channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1233{
1234 char buf[16*1024];
1235 int len;
1236
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001237 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001238 FD_ISSET(c->rfd, readset)) {
1239 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001240 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1241 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001242 if (len <= 0) {
Damien Millerbd483e72000-04-30 10:00:53 +10001243 debug("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001244 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001245 if (c->type != SSH_CHANNEL_OPEN) {
1246 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001247 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001248 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001249 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001250 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001251 c->type = SSH_CHANNEL_INPUT_DRAINING;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001252 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001253 } else {
1254 chan_read_failed(c);
1255 }
1256 return -1;
1257 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001258 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001259 if (c->input_filter(c, buf, len) == -1) {
Ben Lindstromc486d882001-04-11 16:08:34 +00001260 debug("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001261 chan_read_failed(c);
1262 }
1263 } else {
1264 buffer_append(&c->input, buf, len);
1265 }
Damien Millerb38eff82000-04-01 11:09:21 +10001266 }
1267 return 1;
1268}
Ben Lindstrombba81212001-06-25 05:01:22 +00001269static int
Damien Millerb38eff82000-04-01 11:09:21 +10001270channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1271{
Ben Lindstrome229b252001-03-05 06:28:06 +00001272 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001273 u_char *data;
1274 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001275 int len;
1276
1277 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001278 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001279 FD_ISSET(c->wfd, writeset) &&
1280 buffer_len(&c->output) > 0) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001281 data = buffer_ptr(&c->output);
1282 dlen = buffer_len(&c->output);
1283 len = write(c->wfd, data, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001284 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1285 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001286 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001287 if (c->type != SSH_CHANNEL_OPEN) {
1288 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001289 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001290 return -1;
1291 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001292 buffer_clear(&c->output);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001293 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001294 c->type = SSH_CHANNEL_INPUT_DRAINING;
1295 } else {
1296 chan_write_failed(c);
1297 }
1298 return -1;
1299 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001300 if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001301 if (tcgetattr(c->wfd, &tio) == 0 &&
1302 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1303 /*
1304 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001305 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001306 * size of a SSH2_MSG_CHANNEL_DATA message
1307 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +11001308 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001309 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001310 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001311 }
1312 }
Damien Millerb38eff82000-04-01 11:09:21 +10001313 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001314 if (compat20 && len > 0) {
1315 c->local_consumed += len;
1316 }
1317 }
1318 return 1;
1319}
Ben Lindstrombba81212001-06-25 05:01:22 +00001320static int
Damien Miller33b13562000-04-04 14:38:59 +10001321channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1322{
1323 char buf[16*1024];
1324 int len;
1325
Damien Miller1383bd82000-04-06 12:32:37 +10001326/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001327 if (c->efd != -1) {
1328 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1329 FD_ISSET(c->efd, writeset) &&
1330 buffer_len(&c->extended) > 0) {
1331 len = write(c->efd, buffer_ptr(&c->extended),
1332 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001333 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001334 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001335 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1336 return 1;
1337 if (len <= 0) {
1338 debug2("channel %d: closing write-efd %d",
1339 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001340 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001341 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001342 buffer_consume(&c->extended, len);
1343 c->local_consumed += len;
1344 }
1345 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1346 FD_ISSET(c->efd, readset)) {
1347 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001348 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001349 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001350 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1351 return 1;
1352 if (len <= 0) {
1353 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001354 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001355 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001356 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001357 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001358 }
Damien Miller33b13562000-04-04 14:38:59 +10001359 }
1360 }
1361 return 1;
1362}
Ben Lindstrombba81212001-06-25 05:01:22 +00001363static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001364channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001365{
Ben Lindstromb3921512001-04-11 15:57:50 +00001366 if (c->type == SSH_CHANNEL_OPEN &&
1367 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001368 c->local_window < c->local_window_max/2 &&
1369 c->local_consumed > 0) {
1370 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1371 packet_put_int(c->remote_id);
1372 packet_put_int(c->local_consumed);
1373 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001374 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001375 c->self, c->local_window,
1376 c->local_consumed);
1377 c->local_window += c->local_consumed;
1378 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001379 }
1380 return 1;
1381}
1382
Ben Lindstrombba81212001-06-25 05:01:22 +00001383static void
Damien Millerde6987c2002-01-22 23:20:40 +11001384channel_post_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001385{
Damien Miller4623a752001-10-10 15:03:58 +10001386 if (c->delayed)
1387 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001388 channel_handle_rfd(c, readset, writeset);
1389 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001390 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001391 return;
Damien Miller33b13562000-04-04 14:38:59 +10001392 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001393 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001394}
1395
Ben Lindstrombba81212001-06-25 05:01:22 +00001396static void
Damien Millerb38eff82000-04-01 11:09:21 +10001397channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1398{
1399 int len;
1400 /* Send buffered output data to the socket. */
1401 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1402 len = write(c->sock, buffer_ptr(&c->output),
1403 buffer_len(&c->output));
1404 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001405 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001406 else
1407 buffer_consume(&c->output, len);
1408 }
1409}
1410
Ben Lindstrombba81212001-06-25 05:01:22 +00001411static void
Damien Miller33b13562000-04-04 14:38:59 +10001412channel_handler_init_20(void)
1413{
Damien Millerde6987c2002-01-22 23:20:40 +11001414 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001415 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001416 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001417 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001418 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001419 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001420 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001421 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001422
Damien Millerde6987c2002-01-22 23:20:40 +11001423 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001424 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001425 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001426 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001427 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001428 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001429 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001430}
1431
Ben Lindstrombba81212001-06-25 05:01:22 +00001432static void
Damien Millerb38eff82000-04-01 11:09:21 +10001433channel_handler_init_13(void)
1434{
1435 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1436 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1437 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1438 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1439 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1440 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1441 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001442 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001443 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001444
Damien Millerde6987c2002-01-22 23:20:40 +11001445 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001446 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1447 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1448 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1449 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001450 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001451 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001452}
1453
Ben Lindstrombba81212001-06-25 05:01:22 +00001454static void
Damien Millerb38eff82000-04-01 11:09:21 +10001455channel_handler_init_15(void)
1456{
Damien Millerde6987c2002-01-22 23:20:40 +11001457 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001458 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001459 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1460 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1461 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001462 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001463 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001464
1465 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1466 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1467 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001468 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001469 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001470 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001471}
1472
Ben Lindstrombba81212001-06-25 05:01:22 +00001473static void
Damien Millerb38eff82000-04-01 11:09:21 +10001474channel_handler_init(void)
1475{
1476 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001477 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001478 channel_pre[i] = NULL;
1479 channel_post[i] = NULL;
1480 }
Damien Miller33b13562000-04-04 14:38:59 +10001481 if (compat20)
1482 channel_handler_init_20();
1483 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001484 channel_handler_init_13();
1485 else
1486 channel_handler_init_15();
1487}
1488
Damien Miller3ec27592001-10-12 11:35:04 +10001489/* gc dead channels */
1490static void
1491channel_garbage_collect(Channel *c)
1492{
1493 if (c == NULL)
1494 return;
1495 if (c->detach_user != NULL) {
1496 if (!chan_is_dead(c, 0))
1497 return;
1498 debug("channel %d: gc: notify user", c->self);
1499 c->detach_user(c->self, NULL);
1500 /* if we still have a callback */
1501 if (c->detach_user != NULL)
1502 return;
1503 debug("channel %d: gc: user detached", c->self);
1504 }
1505 if (!chan_is_dead(c, 1))
1506 return;
1507 debug("channel %d: garbage collecting", c->self);
1508 channel_free(c);
1509}
1510
Ben Lindstrombba81212001-06-25 05:01:22 +00001511static void
Damien Millerb38eff82000-04-01 11:09:21 +10001512channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1513{
1514 static int did_init = 0;
1515 int i;
1516 Channel *c;
1517
1518 if (!did_init) {
1519 channel_handler_init();
1520 did_init = 1;
1521 }
1522 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001523 c = channels[i];
1524 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001525 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001526 if (ftab[c->type] != NULL)
1527 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001528 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001529 }
1530}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001531
Ben Lindstrome9c99912001-06-09 00:41:05 +00001532/*
1533 * Allocate/update select bitmasks and add any bits relevant to channels in
1534 * select bitmasks.
1535 */
Damien Miller4af51302000-04-16 11:18:38 +10001536void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001537channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001538 int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001539{
Damien Miller5e953212001-01-30 09:14:00 +11001540 int n;
1541 u_int sz;
1542
1543 n = MAX(*maxfdp, channel_max_fd);
1544
1545 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001546 /* perhaps check sz < nalloc/2 and shrink? */
1547 if (*readsetp == NULL || sz > *nallocp) {
1548 *readsetp = xrealloc(*readsetp, sz);
1549 *writesetp = xrealloc(*writesetp, sz);
1550 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001551 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001552 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001553 memset(*readsetp, 0, sz);
1554 memset(*writesetp, 0, sz);
1555
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001556 if (!rekeying)
1557 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001558}
1559
Ben Lindstrome9c99912001-06-09 00:41:05 +00001560/*
1561 * After select, perform any appropriate operations for channels which have
1562 * events pending.
1563 */
Damien Miller4af51302000-04-16 11:18:38 +10001564void
Damien Miller95def091999-11-25 00:26:21 +11001565channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001566{
Damien Millerb38eff82000-04-01 11:09:21 +10001567 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001568}
1569
Ben Lindstrome9c99912001-06-09 00:41:05 +00001570
Damien Miller5e953212001-01-30 09:14:00 +11001571/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001572
Damien Miller4af51302000-04-16 11:18:38 +10001573void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001574channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001575{
Damien Miller95def091999-11-25 00:26:21 +11001576 int len, i;
Damien Millerb38eff82000-04-01 11:09:21 +10001577 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001578
Damien Miller95def091999-11-25 00:26:21 +11001579 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001580 c = channels[i];
1581 if (c == NULL)
1582 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001583
Ben Lindstrome9c99912001-06-09 00:41:05 +00001584 /*
1585 * We are only interested in channels that can have buffered
1586 * incoming data.
1587 */
Damien Miller34132e52000-01-14 15:45:46 +11001588 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001589 if (c->type != SSH_CHANNEL_OPEN &&
1590 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001591 continue;
1592 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001593 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001594 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001595 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001596 if (compat20 &&
1597 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001598 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001599 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001600 continue;
1601 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001602
Damien Miller95def091999-11-25 00:26:21 +11001603 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001604 if ((c->istate == CHAN_INPUT_OPEN ||
1605 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1606 (len = buffer_len(&c->input)) > 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00001607 /*
1608 * Send some data for the other side over the secure
1609 * connection.
1610 */
Damien Miller33b13562000-04-04 14:38:59 +10001611 if (compat20) {
1612 if (len > c->remote_window)
1613 len = c->remote_window;
1614 if (len > c->remote_maxpacket)
1615 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001616 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001617 if (packet_is_interactive()) {
1618 if (len > 1024)
1619 len = 512;
1620 } else {
1621 /* Keep the packets at reasonable size. */
1622 if (len > packet_get_maxsize()/2)
1623 len = packet_get_maxsize()/2;
1624 }
Damien Miller95def091999-11-25 00:26:21 +11001625 }
Damien Millerb38eff82000-04-01 11:09:21 +10001626 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001627 packet_start(compat20 ?
1628 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001629 packet_put_int(c->remote_id);
1630 packet_put_string(buffer_ptr(&c->input), len);
1631 packet_send();
1632 buffer_consume(&c->input, len);
1633 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001634 }
1635 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001636 if (compat13)
1637 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001638 /*
1639 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001640 * tell peer, that we will not send more data: send IEOF.
1641 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001642 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001643 if (CHANNEL_EFD_INPUT_ACTIVE(c))
1644 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1645 c->self, c->efd, buffer_len(&c->extended));
1646 else
1647 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001648 }
Damien Miller33b13562000-04-04 14:38:59 +10001649 /* Send extended data, i.e. stderr */
1650 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001651 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001652 c->remote_window > 0 &&
1653 (len = buffer_len(&c->extended)) > 0 &&
1654 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001655 debug2("channel %d: rwin %d elen %d euse %d",
1656 c->self, c->remote_window, buffer_len(&c->extended),
1657 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001658 if (len > c->remote_window)
1659 len = c->remote_window;
1660 if (len > c->remote_maxpacket)
1661 len = c->remote_maxpacket;
1662 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1663 packet_put_int(c->remote_id);
1664 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1665 packet_put_string(buffer_ptr(&c->extended), len);
1666 packet_send();
1667 buffer_consume(&c->extended, len);
1668 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001669 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001670 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001671 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001672}
1673
Ben Lindstrome9c99912001-06-09 00:41:05 +00001674
1675/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001676
Damien Miller4af51302000-04-16 11:18:38 +10001677void
Damien Miller630d6f42002-01-22 23:17:30 +11001678channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001679{
Damien Miller34132e52000-01-14 15:45:46 +11001680 int id;
Damien Miller95def091999-11-25 00:26:21 +11001681 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001682 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001683 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001684
Damien Miller95def091999-11-25 00:26:21 +11001685 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001686 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001687 c = channel_lookup(id);
1688 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001689 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001690
Damien Miller95def091999-11-25 00:26:21 +11001691 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001692 if (c->type != SSH_CHANNEL_OPEN &&
1693 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001694 return;
1695
1696 /* same for protocol 1.5 if output end is no longer open */
Damien Millerb38eff82000-04-01 11:09:21 +10001697 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
Damien Miller95def091999-11-25 00:26:21 +11001698 return;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001699
Damien Miller95def091999-11-25 00:26:21 +11001700 /* Get the data. */
1701 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001702
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001703 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001704 if (data_len > c->local_maxpacket) {
1705 log("channel %d: rcvd big packet %d, maxpack %d",
1706 c->self, data_len, c->local_maxpacket);
1707 }
1708 if (data_len > c->local_window) {
1709 log("channel %d: rcvd too much data %d, win %d",
1710 c->self, data_len, c->local_window);
1711 xfree(data);
1712 return;
1713 }
1714 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001715 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001716 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001717 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001718 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001719}
Ben Lindstrome9c99912001-06-09 00:41:05 +00001720
Damien Miller4af51302000-04-16 11:18:38 +10001721void
Damien Miller630d6f42002-01-22 23:17:30 +11001722channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001723{
1724 int id;
1725 int tcode;
1726 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001727 u_int data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001728 Channel *c;
1729
1730 /* Get the channel number and verify it. */
1731 id = packet_get_int();
1732 c = channel_lookup(id);
1733
1734 if (c == NULL)
1735 packet_disconnect("Received extended_data for bad channel %d.", id);
1736 if (c->type != SSH_CHANNEL_OPEN) {
1737 log("channel %d: ext data for non open", id);
1738 return;
1739 }
Ben Lindstromcf159442002-03-26 03:26:24 +00001740 if (c->flags & CHAN_EOF_RCVD) {
1741 if (datafellows & SSH_BUG_EXTEOF)
1742 debug("channel %d: accepting ext data after eof", id);
1743 else
1744 packet_disconnect("Received extended_data after EOF "
1745 "on channel %d.", id);
1746 }
Damien Miller33b13562000-04-04 14:38:59 +10001747 tcode = packet_get_int();
1748 if (c->efd == -1 ||
1749 c->extended_usage != CHAN_EXTENDED_WRITE ||
1750 tcode != SSH2_EXTENDED_DATA_STDERR) {
1751 log("channel %d: bad ext data", c->self);
1752 return;
1753 }
1754 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11001755 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10001756 if (data_len > c->local_window) {
1757 log("channel %d: rcvd too much extended_data %d, win %d",
1758 c->self, data_len, c->local_window);
1759 xfree(data);
1760 return;
1761 }
Damien Millerd3444942000-09-30 14:20:03 +11001762 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001763 c->local_window -= data_len;
1764 buffer_append(&c->extended, data, data_len);
1765 xfree(data);
1766}
1767
Damien Miller4af51302000-04-16 11:18:38 +10001768void
Damien Miller630d6f42002-01-22 23:17:30 +11001769channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001770{
1771 int id;
1772 Channel *c;
1773
Damien Millerb38eff82000-04-01 11:09:21 +10001774 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001775 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001776 c = channel_lookup(id);
1777 if (c == NULL)
1778 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1779 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001780
1781 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11001782 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001783 debug("channel %d: FORCE input drain", c->self);
1784 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11001785 if (buffer_len(&c->input) == 0)
1786 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001787 }
1788
Damien Millerb38eff82000-04-01 11:09:21 +10001789}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001790
Damien Miller4af51302000-04-16 11:18:38 +10001791void
Damien Miller630d6f42002-01-22 23:17:30 +11001792channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001793{
Damien Millerb38eff82000-04-01 11:09:21 +10001794 int id;
1795 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001796
Damien Millerb38eff82000-04-01 11:09:21 +10001797 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001798 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001799 c = channel_lookup(id);
1800 if (c == NULL)
1801 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001802
1803 /*
1804 * Send a confirmation that we have closed the channel and no more
1805 * data is coming for it.
1806 */
Damien Miller95def091999-11-25 00:26:21 +11001807 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001808 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001809 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001810
Damien Miller5428f641999-11-25 11:54:57 +11001811 /*
1812 * If the channel is in closed state, we have sent a close request,
1813 * and the other side will eventually respond with a confirmation.
1814 * Thus, we cannot free the channel here, because then there would be
1815 * no-one to receive the confirmation. The channel gets freed when
1816 * the confirmation arrives.
1817 */
Damien Millerb38eff82000-04-01 11:09:21 +10001818 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11001819 /*
1820 * Not a closed channel - mark it as draining, which will
1821 * cause it to be freed later.
1822 */
Damien Miller76765c02002-01-22 23:21:15 +11001823 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10001824 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11001825 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001826}
1827
Damien Millerb38eff82000-04-01 11:09:21 +10001828/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10001829void
Damien Miller630d6f42002-01-22 23:17:30 +11001830channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001831{
Damien Millerb38eff82000-04-01 11:09:21 +10001832 int id = packet_get_int();
1833 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11001834
Damien Miller48b03fc2002-01-22 23:11:40 +11001835 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001836 if (c == NULL)
1837 packet_disconnect("Received oclose for nonexistent channel %d.", id);
1838 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001839}
1840
Damien Miller4af51302000-04-16 11:18:38 +10001841void
Damien Miller630d6f42002-01-22 23:17:30 +11001842channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001843{
1844 int id = packet_get_int();
1845 Channel *c = channel_lookup(id);
1846
Damien Miller48b03fc2002-01-22 23:11:40 +11001847 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10001848 if (c == NULL)
1849 packet_disconnect("Received close confirmation for "
1850 "out-of-range channel %d.", id);
1851 if (c->type != SSH_CHANNEL_CLOSED)
1852 packet_disconnect("Received close confirmation for "
1853 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001854 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001855}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001856
Damien Miller4af51302000-04-16 11:18:38 +10001857void
Damien Miller630d6f42002-01-22 23:17:30 +11001858channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001859{
Damien Millerb38eff82000-04-01 11:09:21 +10001860 int id, remote_id;
1861 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001862
Damien Millerb38eff82000-04-01 11:09:21 +10001863 id = packet_get_int();
1864 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001865
Damien Millerb38eff82000-04-01 11:09:21 +10001866 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1867 packet_disconnect("Received open confirmation for "
1868 "non-opening channel %d.", id);
1869 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11001870 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10001871 c->remote_id = remote_id;
1872 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10001873
1874 if (compat20) {
1875 c->remote_window = packet_get_int();
1876 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11001877 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11001878 debug2("callback start");
Damien Miller67f0bc02002-02-05 12:23:08 +11001879 c->confirm(c->self, NULL);
Damien Millerd3444942000-09-30 14:20:03 +11001880 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001881 }
1882 debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1883 c->remote_window, c->remote_maxpacket);
1884 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001885 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001886}
1887
Ben Lindstrombba81212001-06-25 05:01:22 +00001888static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00001889reason2txt(int reason)
1890{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001891 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001892 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
1893 return "administratively prohibited";
1894 case SSH2_OPEN_CONNECT_FAILED:
1895 return "connect failed";
1896 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
1897 return "unknown channel type";
1898 case SSH2_OPEN_RESOURCE_SHORTAGE:
1899 return "resource shortage";
1900 }
Ben Lindstrome2595442001-06-05 20:01:39 +00001901 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00001902}
1903
Damien Miller4af51302000-04-16 11:18:38 +10001904void
Damien Miller630d6f42002-01-22 23:17:30 +11001905channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001906{
Kevin Steves12057502001-02-05 14:54:34 +00001907 int id, reason;
1908 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10001909 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001910
Damien Millerb38eff82000-04-01 11:09:21 +10001911 id = packet_get_int();
1912 c = channel_lookup(id);
1913
1914 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1915 packet_disconnect("Received open failure for "
1916 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10001917 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00001918 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00001919 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00001920 msg = packet_get_string(NULL);
1921 lang = packet_get_string(NULL);
1922 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001923 log("channel %d: open failed: %s%s%s", id,
1924 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00001925 if (msg != NULL)
1926 xfree(msg);
1927 if (lang != NULL)
1928 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10001929 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001930 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11001931 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001932 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001933}
1934
Damien Miller33b13562000-04-04 14:38:59 +10001935void
Damien Miller630d6f42002-01-22 23:17:30 +11001936channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001937{
1938 Channel *c;
1939 int id, adjust;
1940
1941 if (!compat20)
1942 return;
1943
1944 /* Get the channel number and verify it. */
1945 id = packet_get_int();
1946 c = channel_lookup(id);
1947
1948 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
1949 log("Received window adjust for "
1950 "non-open channel %d.", id);
1951 return;
1952 }
1953 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11001954 packet_check_eom();
Damien Millerd3444942000-09-30 14:20:03 +11001955 debug2("channel %d: rcvd adjust %d", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10001956 c->remote_window += adjust;
1957}
1958
Damien Miller4af51302000-04-16 11:18:38 +10001959void
Damien Miller630d6f42002-01-22 23:17:30 +11001960channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001961{
Ben Lindstrome9c99912001-06-09 00:41:05 +00001962 Channel *c = NULL;
1963 u_short host_port;
1964 char *host, *originator_string;
1965 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001966
Ben Lindstrome9c99912001-06-09 00:41:05 +00001967 remote_id = packet_get_int();
1968 host = packet_get_string(NULL);
1969 host_port = packet_get_int();
1970
1971 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
1972 originator_string = packet_get_string(NULL);
1973 } else {
1974 originator_string = xstrdup("unknown (remote did not supply name)");
1975 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001976 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00001977 sock = channel_connect_to(host, host_port);
1978 if (sock != -1) {
1979 c = channel_new("connected socket",
1980 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
1981 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11001982 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001983 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001984 if (c == NULL) {
1985 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1986 packet_put_int(remote_id);
1987 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001988 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001989 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001990}
1991
1992
Ben Lindstrome9c99912001-06-09 00:41:05 +00001993/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001994
Ben Lindstrom908afed2001-10-03 17:34:59 +00001995void
1996channel_set_af(int af)
1997{
1998 IPv4or6 = af;
1999}
2000
Damien Millerb16461c2002-01-22 23:29:22 +11002001static int
2002channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2003 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002004{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002005 Channel *c;
Damien Millerb16461c2002-01-22 23:29:22 +11002006 int success, sock, on = 1;
Damien Miller34132e52000-01-14 15:45:46 +11002007 struct addrinfo hints, *ai, *aitop;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002008 const char *host;
Damien Millerb16461c2002-01-22 23:29:22 +11002009 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller5428f641999-11-25 11:54:57 +11002010 struct linger linger;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002011
Kevin Steves12057502001-02-05 14:54:34 +00002012 success = 0;
Damien Millerb16461c2002-01-22 23:29:22 +11002013 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2014 listen_addr : host_to_connect;
Kevin Steves12057502001-02-05 14:54:34 +00002015
Damien Millerb16461c2002-01-22 23:29:22 +11002016 if (host == NULL) {
2017 error("No forward host name.");
2018 return success;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002019 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002020 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002021 error("Forward host name too long.");
2022 return success;
2023 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002024
Damien Miller5428f641999-11-25 11:54:57 +11002025 /*
Damien Miller34132e52000-01-14 15:45:46 +11002026 * getaddrinfo returns a loopback address if the hostname is
2027 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002028 */
Damien Miller34132e52000-01-14 15:45:46 +11002029 memset(&hints, 0, sizeof(hints));
2030 hints.ai_family = IPv4or6;
2031 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
2032 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002033 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002034 if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
2035 packet_disconnect("getaddrinfo: fatal error");
Damien Miller5428f641999-11-25 11:54:57 +11002036
Damien Miller34132e52000-01-14 15:45:46 +11002037 for (ai = aitop; ai; ai = ai->ai_next) {
2038 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2039 continue;
2040 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2041 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002042 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002043 continue;
2044 }
2045 /* Create a port to listen for the host. */
2046 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2047 if (sock < 0) {
2048 /* this is no error since kernel may not support ipv6 */
2049 verbose("socket: %.100s", strerror(errno));
2050 continue;
2051 }
2052 /*
2053 * Set socket options. We would like the socket to disappear
2054 * as soon as it has been closed for whatever reason.
2055 */
Ben Lindstrom733a2352002-03-05 01:31:28 +00002056 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
Damien Miller34132e52000-01-14 15:45:46 +11002057 linger.l_onoff = 1;
2058 linger.l_linger = 5;
Ben Lindstrom733a2352002-03-05 01:31:28 +00002059 setsockopt(sock, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger));
Damien Miller34132e52000-01-14 15:45:46 +11002060 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002061
Damien Miller34132e52000-01-14 15:45:46 +11002062 /* Bind the socket to the address. */
2063 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2064 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002065 if (!ai->ai_next)
2066 error("bind: %.100s", strerror(errno));
2067 else
2068 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002069
Damien Miller34132e52000-01-14 15:45:46 +11002070 close(sock);
2071 continue;
2072 }
2073 /* Start listening for connections on the socket. */
2074 if (listen(sock, 5) < 0) {
2075 error("listen: %.100s", strerror(errno));
2076 close(sock);
2077 continue;
2078 }
2079 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002080 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002081 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002082 0, xstrdup("port listener"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002083 strlcpy(c->path, host, sizeof(c->path));
2084 c->host_port = port_to_connect;
2085 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002086 success = 1;
2087 }
2088 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002089 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002090 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002091 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002092 return success;
Damien Miller95def091999-11-25 00:26:21 +11002093}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002094
Damien Millerb16461c2002-01-22 23:29:22 +11002095/* protocol local port fwd, used by ssh (and sshd in v1) */
2096int
2097channel_setup_local_fwd_listener(u_short listen_port,
2098 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2099{
2100 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
2101 NULL, listen_port, host_to_connect, port_to_connect, gateway_ports);
2102}
2103
2104/* protocol v2 remote port fwd, used by sshd */
2105int
2106channel_setup_remote_fwd_listener(const char *listen_address,
2107 u_short listen_port, int gateway_ports)
2108{
2109 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2110 listen_address, listen_port, NULL, 0, gateway_ports);
2111}
2112
Damien Miller5428f641999-11-25 11:54:57 +11002113/*
2114 * Initiate forwarding of connections to port "port" on remote host through
2115 * the secure channel to host:port from local side.
2116 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002117
Damien Miller4af51302000-04-16 11:18:38 +10002118void
Damien Miller0bc1bd82000-11-13 22:57:25 +11002119channel_request_remote_forwarding(u_short listen_port,
2120 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002121{
Damien Millerdff50992002-01-22 23:16:32 +11002122 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002123
Damien Miller95def091999-11-25 00:26:21 +11002124 /* Record locally that connection to this host/port is permitted. */
2125 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2126 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002127
Damien Miller95def091999-11-25 00:26:21 +11002128 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002129 if (compat20) {
2130 const char *address_to_bind = "0.0.0.0";
2131 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2132 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002133 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002134 packet_put_cstring(address_to_bind);
2135 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002136 packet_send();
2137 packet_write_wait();
2138 /* Assume that server accepts the request */
2139 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002140 } else {
2141 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002142 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002143 packet_put_cstring(host_to_connect);
2144 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002145 packet_send();
2146 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002147
2148 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002149 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002150 switch (type) {
2151 case SSH_SMSG_SUCCESS:
2152 success = 1;
2153 break;
2154 case SSH_SMSG_FAILURE:
2155 log("Warning: Server denied remote port forwarding.");
2156 break;
2157 default:
2158 /* Unknown packet */
2159 packet_disconnect("Protocol error for port forward request:"
2160 "received packet type %d.", type);
2161 }
2162 }
2163 if (success) {
2164 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2165 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2166 permitted_opens[num_permitted_opens].listen_port = listen_port;
2167 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002168 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002169}
2170
Damien Miller5428f641999-11-25 11:54:57 +11002171/*
2172 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2173 * listening for the port, and sends back a success reply (or disconnect
2174 * message if there was an error). This never returns if there was an error.
2175 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002176
Damien Miller4af51302000-04-16 11:18:38 +10002177void
Damien Millere247cc42000-05-07 12:03:14 +10002178channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002179{
Damien Milleraae6c611999-12-06 11:47:28 +11002180 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002181 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002182
Damien Miller95def091999-11-25 00:26:21 +11002183 /* Get arguments from the packet. */
2184 port = packet_get_int();
2185 hostname = packet_get_string(NULL);
2186 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002187
Damien Millerbac2d8a2000-09-05 16:13:06 +11002188#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002189 /*
2190 * Check that an unprivileged user is not trying to forward a
2191 * privileged port.
2192 */
Damien Miller95def091999-11-25 00:26:21 +11002193 if (port < IPPORT_RESERVED && !is_root)
2194 packet_disconnect("Requested forwarding of port %d but user is not root.",
2195 port);
Damien Millerbac2d8a2000-09-05 16:13:06 +11002196#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +11002197 /* Initiate forwarding */
Damien Millerb16461c2002-01-22 23:29:22 +11002198 channel_setup_local_fwd_listener(port, hostname, host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002199
2200 /* Free the argument string. */
2201 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002202}
2203
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002204/*
2205 * Permits opening to any host/port if permitted_opens[] is empty. This is
2206 * usually called by the server, because the user could connect to any port
2207 * anyway, and the server has no way to know but to trust the client anyway.
2208 */
2209void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002210channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002211{
2212 if (num_permitted_opens == 0)
2213 all_opens_permitted = 1;
2214}
2215
Ben Lindstroma3700052001-04-05 23:26:32 +00002216void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002217channel_add_permitted_opens(char *host, int port)
2218{
2219 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2220 fatal("channel_request_remote_forwarding: too many forwards");
2221 debug("allow port forwarding to host %s port %d", host, port);
2222
2223 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2224 permitted_opens[num_permitted_opens].port_to_connect = port;
2225 num_permitted_opens++;
2226
2227 all_opens_permitted = 0;
2228}
2229
Ben Lindstroma3700052001-04-05 23:26:32 +00002230void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002231channel_clear_permitted_opens(void)
2232{
2233 int i;
2234
2235 for (i = 0; i < num_permitted_opens; i++)
2236 xfree(permitted_opens[i].host_to_connect);
2237 num_permitted_opens = 0;
2238
2239}
2240
2241
2242/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002243static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002244connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002245{
Damien Miller34132e52000-01-14 15:45:46 +11002246 struct addrinfo hints, *ai, *aitop;
2247 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2248 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002249 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002250
Damien Miller34132e52000-01-14 15:45:46 +11002251 memset(&hints, 0, sizeof(hints));
2252 hints.ai_family = IPv4or6;
2253 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002254 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002255 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002256 error("connect_to %.100s: unknown host (%s)", host,
2257 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002258 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002259 }
Damien Miller34132e52000-01-14 15:45:46 +11002260 for (ai = aitop; ai; ai = ai->ai_next) {
2261 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2262 continue;
2263 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2264 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002265 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002266 continue;
2267 }
Damien Miller34132e52000-01-14 15:45:46 +11002268 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2269 if (sock < 0) {
2270 error("socket: %.100s", strerror(errno));
2271 continue;
2272 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +00002273 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002274 fatal("connect_to: F_SETFL: %s", strerror(errno));
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002275 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2276 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002277 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002278 strerror(errno));
2279 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002280 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002281 }
2282 break; /* success */
2283
2284 }
2285 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002286 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002287 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002288 return -1;
2289 }
2290 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002291 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002292 return sock;
2293}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002294
Damien Miller0bc1bd82000-11-13 22:57:25 +11002295int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002296channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002297{
2298 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002299
Damien Miller0bc1bd82000-11-13 22:57:25 +11002300 for (i = 0; i < num_permitted_opens; i++)
2301 if (permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002302 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002303 permitted_opens[i].host_to_connect,
2304 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002305 error("WARNING: Server requests forwarding for unknown listen_port %d",
2306 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002307 return -1;
2308}
Damien Millerb38eff82000-04-01 11:09:21 +10002309
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002310/* Check if connecting to that port is permitted and connect. */
2311int
2312channel_connect_to(const char *host, u_short port)
2313{
2314 int i, permit;
2315
2316 permit = all_opens_permitted;
2317 if (!permit) {
2318 for (i = 0; i < num_permitted_opens; i++)
2319 if (permitted_opens[i].port_to_connect == port &&
2320 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2321 permit = 1;
2322
2323 }
2324 if (!permit) {
2325 log("Received request to connect to host %.100s port %d, "
2326 "but the request was denied.", host, port);
2327 return -1;
2328 }
2329 return connect_to(host, port);
2330}
2331
Ben Lindstrome9c99912001-06-09 00:41:05 +00002332/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002333
Damien Miller5428f641999-11-25 11:54:57 +11002334/*
2335 * Creates an internet domain socket for listening for X11 connections.
Kevin Steves366298c2001-12-19 17:58:01 +00002336 * Returns a suitable display number for the DISPLAY variable, or -1 if
2337 * an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002338 */
Kevin Steves366298c2001-12-19 17:58:01 +00002339int
Damien Miller95c249f2002-02-05 12:11:34 +11002340x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Millere7378562001-12-21 14:58:35 +11002341 int single_connection)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002342{
Damien Millere7378562001-12-21 14:58:35 +11002343 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002344 int display_number, sock;
2345 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002346 struct addrinfo hints, *ai, *aitop;
2347 char strport[NI_MAXSERV];
2348 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002349
Damien Millera34a28b1999-12-14 10:47:15 +11002350 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002351 display_number < MAX_DISPLAYS;
2352 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002353 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002354 memset(&hints, 0, sizeof(hints));
2355 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002356 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002357 hints.ai_socktype = SOCK_STREAM;
2358 snprintf(strport, sizeof strport, "%d", port);
2359 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2360 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002361 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002362 }
Damien Miller34132e52000-01-14 15:45:46 +11002363 for (ai = aitop; ai; ai = ai->ai_next) {
2364 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2365 continue;
2366 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2367 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002368 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002369 error("socket: %.100s", strerror(errno));
Kevin Steves366298c2001-12-19 17:58:01 +00002370 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002371 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002372 debug("x11_create_display_inet: Socket family %d not supported",
2373 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002374 continue;
2375 }
Damien Miller34132e52000-01-14 15:45:46 +11002376 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002377#ifdef IPV6_V6ONLY
2378 if (ai->ai_family == AF_INET6) {
2379 int on = 1;
2380 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2381 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2382 }
2383#endif
Damien Miller34132e52000-01-14 15:45:46 +11002384 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2385 debug("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002386 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002387
2388 if (ai->ai_next)
2389 continue;
2390
Damien Miller34132e52000-01-14 15:45:46 +11002391 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002392 close(socks[n]);
2393 }
2394 num_socks = 0;
2395 break;
2396 }
2397 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002398#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002399 if (num_socks == NUM_SOCKS)
2400 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002401#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002402 if (x11_use_localhost) {
2403 if (num_socks == NUM_SOCKS)
2404 break;
2405 } else {
2406 break;
2407 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002408#endif
Damien Miller95def091999-11-25 00:26:21 +11002409 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002410 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002411 if (num_socks > 0)
2412 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002413 }
Damien Miller95def091999-11-25 00:26:21 +11002414 if (display_number >= MAX_DISPLAYS) {
2415 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002416 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002417 }
Damien Miller95def091999-11-25 00:26:21 +11002418 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002419 for (n = 0; n < num_socks; n++) {
2420 sock = socks[n];
2421 if (listen(sock, 5) < 0) {
2422 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002423 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002424 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002425 }
Damien Miller95def091999-11-25 00:26:21 +11002426 }
Damien Miller34132e52000-01-14 15:45:46 +11002427
Damien Miller34132e52000-01-14 15:45:46 +11002428 /* Allocate a channel for each socket. */
2429 for (n = 0; n < num_socks; n++) {
2430 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002431 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002432 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2433 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002434 0, xstrdup("X11 inet listener"), 1);
Damien Miller699d0032002-02-08 22:07:16 +11002435 nc->single_connection = single_connection;
Damien Miller34132e52000-01-14 15:45:46 +11002436 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002437
Kevin Steves366298c2001-12-19 17:58:01 +00002438 /* Return the display number for the DISPLAY environment variable. */
2439 return display_number;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002440}
2441
Ben Lindstrombba81212001-06-25 05:01:22 +00002442static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002443connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002444{
Damien Miller95def091999-11-25 00:26:21 +11002445 int sock;
2446 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002447
Damien Miller3afe3752001-12-21 12:39:51 +11002448 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2449 if (sock < 0)
2450 error("socket: %.100s", strerror(errno));
2451 memset(&addr, 0, sizeof(addr));
2452 addr.sun_family = AF_UNIX;
2453 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
2454 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2455 return sock;
2456 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002457 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2458 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002459}
2460
Damien Millerbd483e72000-04-30 10:00:53 +10002461int
2462x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002463{
Damien Miller398e1cf2002-02-05 11:52:13 +11002464 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002465 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002466 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002467 struct addrinfo hints, *ai, *aitop;
2468 char strport[NI_MAXSERV];
2469 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002470
Damien Miller95def091999-11-25 00:26:21 +11002471 /* Try to open a socket for the local X server. */
2472 display = getenv("DISPLAY");
2473 if (!display) {
2474 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002475 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002476 }
Damien Miller5428f641999-11-25 11:54:57 +11002477 /*
2478 * Now we decode the value of the DISPLAY variable and make a
2479 * connection to the real X server.
2480 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002481
Damien Miller5428f641999-11-25 11:54:57 +11002482 /*
2483 * Check if it is a unix domain socket. Unix domain displays are in
2484 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2485 */
Damien Miller95def091999-11-25 00:26:21 +11002486 if (strncmp(display, "unix:", 5) == 0 ||
2487 display[0] == ':') {
2488 /* Connect to the unix domain socket. */
2489 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2490 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002491 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002492 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002493 }
2494 /* Create a socket. */
2495 sock = connect_local_xsocket(display_number);
2496 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002497 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002498
2499 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002500 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002501 }
Damien Miller5428f641999-11-25 11:54:57 +11002502 /*
2503 * Connect to an inet socket. The DISPLAY value is supposedly
2504 * hostname:d[.s], where hostname may also be numeric IP address.
2505 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002506 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002507 cp = strchr(buf, ':');
2508 if (!cp) {
2509 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002510 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002511 }
Damien Miller95def091999-11-25 00:26:21 +11002512 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002513 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002514 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2515 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002516 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002517 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002518 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002519
Damien Miller34132e52000-01-14 15:45:46 +11002520 /* Look up the host address */
2521 memset(&hints, 0, sizeof(hints));
2522 hints.ai_family = IPv4or6;
2523 hints.ai_socktype = SOCK_STREAM;
2524 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2525 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2526 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002527 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002528 }
Damien Miller34132e52000-01-14 15:45:46 +11002529 for (ai = aitop; ai; ai = ai->ai_next) {
2530 /* Create a socket. */
2531 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2532 if (sock < 0) {
2533 debug("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002534 continue;
2535 }
2536 /* Connect it to the display. */
2537 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2538 debug("connect %.100s port %d: %.100s", buf,
2539 6000 + display_number, strerror(errno));
2540 close(sock);
2541 continue;
2542 }
2543 /* Success */
2544 break;
Damien Miller34132e52000-01-14 15:45:46 +11002545 }
Damien Miller34132e52000-01-14 15:45:46 +11002546 freeaddrinfo(aitop);
2547 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002548 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002549 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002550 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002551 }
Damien Miller398e1cf2002-02-05 11:52:13 +11002552 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10002553 return sock;
2554}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002555
Damien Millerbd483e72000-04-30 10:00:53 +10002556/*
2557 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2558 * the remote channel number. We should do whatever we want, and respond
2559 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2560 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002561
Damien Millerbd483e72000-04-30 10:00:53 +10002562void
Damien Miller630d6f42002-01-22 23:17:30 +11002563x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002564{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002565 Channel *c = NULL;
2566 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002567 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002568
2569 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002570
2571 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002572
2573 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002574 remote_host = packet_get_string(NULL);
2575 } else {
2576 remote_host = xstrdup("unknown (remote did not supply name)");
2577 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002578 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10002579
2580 /* Obtain a connection to the real X display. */
2581 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002582 if (sock != -1) {
2583 /* Allocate a channel for this connection. */
2584 c = channel_new("connected x11 socket",
2585 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2586 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002587 c->remote_id = remote_id;
2588 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002589 }
2590 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002591 /* Send refusal to the remote host. */
2592 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002593 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10002594 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10002595 /* Send a confirmation to the remote host. */
2596 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002597 packet_put_int(remote_id);
2598 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10002599 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002600 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002601}
2602
Damien Miller69b69aa2000-10-28 14:19:58 +11002603/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2604void
Damien Miller630d6f42002-01-22 23:17:30 +11002605deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11002606{
2607 int rchan = packet_get_int();
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002608 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11002609 case SSH_SMSG_AGENT_OPEN:
2610 error("Warning: ssh server tried agent forwarding.");
2611 break;
2612 case SSH_SMSG_X11_OPEN:
2613 error("Warning: ssh server tried X11 forwarding.");
2614 break;
2615 default:
Damien Miller630d6f42002-01-22 23:17:30 +11002616 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11002617 break;
2618 }
2619 error("Warning: this is probably a break in attempt by a malicious server.");
2620 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2621 packet_put_int(rchan);
2622 packet_send();
2623}
2624
Damien Miller5428f641999-11-25 11:54:57 +11002625/*
2626 * Requests forwarding of X11 connections, generates fake authentication
2627 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00002628 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11002629 */
Damien Miller4af51302000-04-16 11:18:38 +10002630void
Damien Millerbd483e72000-04-30 10:00:53 +10002631x11_request_forwarding_with_spoofing(int client_session_id,
2632 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002633{
Ben Lindstrom46c16222000-12-22 01:43:59 +00002634 u_int data_len = (u_int) strlen(data) / 2;
Ben Lindstromb3211a82001-02-10 22:33:19 +00002635 u_int i, value, len;
Damien Miller95def091999-11-25 00:26:21 +11002636 char *new_data;
2637 int screen_number;
2638 const char *cp;
2639 u_int32_t rand = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002640
Damien Miller95def091999-11-25 00:26:21 +11002641 cp = getenv("DISPLAY");
2642 if (cp)
2643 cp = strchr(cp, ':');
2644 if (cp)
2645 cp = strchr(cp, '.');
2646 if (cp)
2647 screen_number = atoi(cp + 1);
2648 else
2649 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002650
Damien Miller95def091999-11-25 00:26:21 +11002651 /* Save protocol name. */
2652 x11_saved_proto = xstrdup(proto);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002653
Damien Miller5428f641999-11-25 11:54:57 +11002654 /*
2655 * Extract real authentication data and generate fake data of the
2656 * same length.
2657 */
Damien Miller95def091999-11-25 00:26:21 +11002658 x11_saved_data = xmalloc(data_len);
2659 x11_fake_data = xmalloc(data_len);
2660 for (i = 0; i < data_len; i++) {
2661 if (sscanf(data + 2 * i, "%2x", &value) != 1)
2662 fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2663 if (i % 4 == 0)
2664 rand = arc4random();
2665 x11_saved_data[i] = value;
2666 x11_fake_data[i] = rand & 0xff;
2667 rand >>= 8;
2668 }
2669 x11_saved_data_len = data_len;
2670 x11_fake_data_len = data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002671
Damien Miller95def091999-11-25 00:26:21 +11002672 /* Convert the fake data into hex. */
Ben Lindstromb3211a82001-02-10 22:33:19 +00002673 len = 2 * data_len + 1;
2674 new_data = xmalloc(len);
Damien Miller95def091999-11-25 00:26:21 +11002675 for (i = 0; i < data_len; i++)
Ben Lindstromb3211a82001-02-10 22:33:19 +00002676 snprintf(new_data + 2 * i, len - 2 * i,
2677 "%02x", (u_char) x11_fake_data[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002678
Damien Miller95def091999-11-25 00:26:21 +11002679 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10002680 if (compat20) {
2681 channel_request_start(client_session_id, "x11-req", 0);
2682 packet_put_char(0); /* XXX bool single connection */
2683 } else {
2684 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2685 }
2686 packet_put_cstring(proto);
2687 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11002688 packet_put_int(screen_number);
2689 packet_send();
2690 packet_write_wait();
2691 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002692}
2693
Ben Lindstrome9c99912001-06-09 00:41:05 +00002694
2695/* -- agent forwarding */
2696
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002697/* Sends a message to the server to request authentication fd forwarding. */
2698
Damien Miller4af51302000-04-16 11:18:38 +10002699void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002700auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002701{
Damien Miller95def091999-11-25 00:26:21 +11002702 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2703 packet_send();
2704 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002705}
2706
Damien Miller5428f641999-11-25 11:54:57 +11002707/*
2708 * Returns the name of the forwarded authentication socket. Returns NULL if
2709 * there is no forwarded authentication socket. The returned value points to
2710 * a static buffer.
2711 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002712
Damien Miller95def091999-11-25 00:26:21 +11002713char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002714auth_get_socket_name(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002715{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002716 return auth_sock_name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002717}
2718
2719/* removes the agent forwarding socket */
2720
Damien Miller4af51302000-04-16 11:18:38 +10002721void
Ben Lindstrom983c0982001-06-09 01:20:06 +00002722auth_sock_cleanup_proc(void *_pw)
Damien Miller95def091999-11-25 00:26:21 +11002723{
Ben Lindstrom983c0982001-06-09 01:20:06 +00002724 struct passwd *pw = _pw;
2725
Ben Lindstrom838394c2001-06-09 01:11:59 +00002726 if (auth_sock_name) {
Ben Lindstrom983c0982001-06-09 01:20:06 +00002727 temporarily_use_uid(pw);
Ben Lindstrom838394c2001-06-09 01:11:59 +00002728 unlink(auth_sock_name);
2729 rmdir(auth_sock_dir);
2730 auth_sock_name = NULL;
Ben Lindstrom983c0982001-06-09 01:20:06 +00002731 restore_uid();
Ben Lindstrom838394c2001-06-09 01:11:59 +00002732 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002733}
2734
Damien Miller5428f641999-11-25 11:54:57 +11002735/*
Damien Millerd3a18572000-06-07 19:55:44 +10002736 * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
Damien Miller5428f641999-11-25 11:54:57 +11002737 * This starts forwarding authentication requests.
2738 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002739
Damien Millerd3a18572000-06-07 19:55:44 +10002740int
Damien Miller95def091999-11-25 00:26:21 +11002741auth_input_request_forwarding(struct passwd * pw)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002742{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002743 Channel *nc;
2744 int sock;
Damien Miller95def091999-11-25 00:26:21 +11002745 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002746
Ben Lindstrome9c99912001-06-09 00:41:05 +00002747 if (auth_get_socket_name() != NULL) {
2748 error("authentication forwarding requested twice.");
2749 return 0;
2750 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002751
Damien Miller95def091999-11-25 00:26:21 +11002752 /* Temporarily drop privileged uid for mkdir/bind. */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +00002753 temporarily_use_uid(pw);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002754
Damien Miller95def091999-11-25 00:26:21 +11002755 /* Allocate a buffer for the socket name, and format the name. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002756 auth_sock_name = xmalloc(MAXPATHLEN);
2757 auth_sock_dir = xmalloc(MAXPATHLEN);
2758 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002759
Damien Miller95def091999-11-25 00:26:21 +11002760 /* Create private directory for socket */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002761 if (mkdtemp(auth_sock_dir) == NULL) {
2762 packet_send_debug("Agent forwarding disabled: "
2763 "mkdtemp() failed: %.100s", strerror(errno));
Damien Millerd3a18572000-06-07 19:55:44 +10002764 restore_uid();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002765 xfree(auth_sock_name);
2766 xfree(auth_sock_dir);
2767 auth_sock_name = NULL;
2768 auth_sock_dir = NULL;
Damien Millerd3a18572000-06-07 19:55:44 +10002769 return 0;
2770 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002771 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d",
2772 auth_sock_dir, (int) getpid());
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002773
Ben Lindstrom838394c2001-06-09 01:11:59 +00002774 /* delete agent socket on fatal() */
Ben Lindstrom983c0982001-06-09 01:20:06 +00002775 fatal_add_cleanup(auth_sock_cleanup_proc, pw);
Ben Lindstrom838394c2001-06-09 01:11:59 +00002776
Damien Miller95def091999-11-25 00:26:21 +11002777 /* Create the socket. */
2778 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2779 if (sock < 0)
2780 packet_disconnect("socket: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002781
Damien Miller95def091999-11-25 00:26:21 +11002782 /* Bind it to the name. */
2783 memset(&sunaddr, 0, sizeof(sunaddr));
2784 sunaddr.sun_family = AF_UNIX;
Ben Lindstromccd8d072001-12-07 17:26:48 +00002785 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002786
Damien Miller95def091999-11-25 00:26:21 +11002787 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
2788 packet_disconnect("bind: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002789
Damien Miller95def091999-11-25 00:26:21 +11002790 /* Restore the privileged uid. */
2791 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002792
Damien Miller95def091999-11-25 00:26:21 +11002793 /* Start listening on the socket. */
2794 if (listen(sock, 5) < 0)
2795 packet_disconnect("listen: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002796
Damien Miller95def091999-11-25 00:26:21 +11002797 /* Allocate a channel for the authentication agent socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002798 nc = channel_new("auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11002799 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
2800 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
2801 0, xstrdup("auth socket"), 1);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002802 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
Damien Millerd3a18572000-06-07 19:55:44 +10002803 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002804}
2805
2806/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2807
Damien Miller4af51302000-04-16 11:18:38 +10002808void
Damien Miller630d6f42002-01-22 23:17:30 +11002809auth_input_open_request(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002810{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002811 Channel *c = NULL;
2812 int remote_id, sock;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002813 char *name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002814
Damien Miller95def091999-11-25 00:26:21 +11002815 /* Read the remote channel number from the message. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002816 remote_id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002817 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002818
Damien Miller5428f641999-11-25 11:54:57 +11002819 /*
2820 * Get a connection to the local authentication agent (this may again
2821 * get forwarded).
2822 */
Damien Miller95def091999-11-25 00:26:21 +11002823 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002824
Damien Miller5428f641999-11-25 11:54:57 +11002825 /*
2826 * If we could not connect the agent, send an error message back to
2827 * the server. This should never happen unless the agent dies,
2828 * because authentication forwarding is only enabled if we have an
2829 * agent.
2830 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002831 if (sock >= 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00002832 name = xstrdup("authentication agent connection");
2833 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
2834 -1, 0, 0, 0, name, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002835 c->remote_id = remote_id;
2836 c->force_drain = 1;
Damien Miller95def091999-11-25 00:26:21 +11002837 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002838 if (c == NULL) {
2839 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2840 packet_put_int(remote_id);
2841 } else {
2842 /* Send a confirmation to the remote host. */
2843 debug("Forwarding authentication connection.");
2844 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2845 packet_put_int(remote_id);
2846 packet_put_int(c->self);
2847 }
Damien Miller95def091999-11-25 00:26:21 +11002848 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002849}