blob: 63eb5bcff40876161f9812bced2b759473965aa0 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * This file contains functions for generic socket connection forwarding.
6 * There is also code for initiating connection forwarding for X11 connections,
7 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10008 *
Damien Millere4340be2000-09-16 13:29:08 +11009 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose. Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
14 *
Damien Miller33b13562000-04-04 14:38:59 +100015 * SSH2 support added by Markus Friedl.
Ben Lindstrom44697232001-07-04 03:32:30 +000016 * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110017 * Copyright (c) 1999 Dug Song. All rights reserved.
18 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110039 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41#include "includes.h"
Damien Miller9f0f5c62001-12-21 14:45:46 +110042RCSID("$OpenBSD: channels.c,v 1.148 2001/12/19 07:18:56 deraadt 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
Damien Millerc0fd17f2000-06-26 10:22:53 +1000149 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) {
Damien Miller33b13562000-04-04 14:38:59 +1000220 chan_init();
Damien Miller95def091999-11-25 00:26:21 +1100221 channels_alloc = 10;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000222 channels = xmalloc(channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100223 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000224 channels[i] = NULL;
Ben Lindstrom601e4362001-06-21 03:19:23 +0000225 fatal_add_cleanup((void (*) (void *)) channel_free_all, NULL);
Damien Miller95def091999-11-25 00:26:21 +1100226 }
227 /* Try to find a free slot where to put the new channel. */
228 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000229 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100230 /* Found a free slot. */
231 found = i;
232 break;
233 }
234 if (found == -1) {
Damien Miller5428f641999-11-25 11:54:57 +1100235 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100236 found = channels_alloc;
237 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100238 debug2("channel: expanding %d", channels_alloc);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000239 channels = xrealloc(channels, channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100240 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000241 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100242 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000243 /* Initialize and return new channel. */
244 c = channels[found] = xmalloc(sizeof(Channel));
Damien Miller4623a752001-10-10 15:03:58 +1000245 memset(c, 0, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100246 buffer_init(&c->input);
247 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000248 buffer_init(&c->extended);
Damien Miller95def091999-11-25 00:26:21 +1100249 chan_init_iostates(c);
Damien Miller69b69aa2000-10-28 14:19:58 +1100250 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100251 c->self = found;
252 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000253 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000254 c->local_window = window;
255 c->local_window_max = window;
256 c->local_consumed = 0;
257 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100258 c->remote_id = -1;
259 c->remote_name = remote_name;
Damien Millerb38eff82000-04-01 11:09:21 +1000260 c->remote_window = 0;
261 c->remote_maxpacket = 0;
262 c->cb_fn = NULL;
263 c->cb_arg = NULL;
264 c->cb_event = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000265 c->force_drain = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000266 c->detach_user = 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
591channel_request(int id, char *service, int wantconfirm)
592{
593 channel_request_start(id, service, wantconfirm);
594 packet_send();
595 debug("channel request %d: %s", id, service) ;
596}
597void
598channel_request_start(int id, char *service, int wantconfirm)
599{
600 Channel *c = channel_lookup(id);
601 if (c == NULL) {
602 log("channel_request: %d: bad id", id);
603 return;
604 }
605 packet_start(SSH2_MSG_CHANNEL_REQUEST);
606 packet_put_int(c->remote_id);
607 packet_put_cstring(service);
608 packet_put_char(wantconfirm);
609}
610void
611channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
612{
613 Channel *c = channel_lookup(id);
614 if (c == NULL) {
615 log("channel_register_callback: %d: bad id", id);
616 return;
617 }
618 c->cb_event = mtype;
619 c->cb_fn = fn;
620 c->cb_arg = arg;
621}
622void
623channel_register_cleanup(int id, channel_callback_fn *fn)
624{
625 Channel *c = channel_lookup(id);
626 if (c == NULL) {
627 log("channel_register_cleanup: %d: bad id", id);
628 return;
629 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000630 c->detach_user = fn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000631}
632void
633channel_cancel_cleanup(int id)
634{
635 Channel *c = channel_lookup(id);
636 if (c == NULL) {
637 log("channel_cancel_cleanup: %d: bad id", id);
638 return;
639 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000640 c->detach_user = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000641}
642void
643channel_register_filter(int id, channel_filter_fn *fn)
644{
645 Channel *c = channel_lookup(id);
646 if (c == NULL) {
647 log("channel_register_filter: %d: bad id", id);
648 return;
649 }
650 c->input_filter = fn;
651}
652
653void
654channel_set_fds(int id, int rfd, int wfd, int efd,
655 int extusage, int nonblock)
656{
657 Channel *c = channel_lookup(id);
658 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
659 fatal("channel_activate for non-larval channel %d.", id);
660 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
661 c->type = SSH_CHANNEL_OPEN;
662 /* XXX window size? */
663 c->local_window = c->local_window_max = c->local_maxpacket * 2;
664 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
665 packet_put_int(c->remote_id);
666 packet_put_int(c->local_window);
667 packet_send();
668}
669
Damien Miller5428f641999-11-25 11:54:57 +1100670/*
Damien Millerb38eff82000-04-01 11:09:21 +1000671 * 'channel_pre*' are called just before select() to add any bits relevant to
672 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100673 */
Damien Millerb38eff82000-04-01 11:09:21 +1000674/*
675 * 'channel_post*': perform any appropriate operations for channels which
676 * have events pending.
677 */
678typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
679chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
680chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
681
Ben Lindstrombba81212001-06-25 05:01:22 +0000682static void
Damien Millerb38eff82000-04-01 11:09:21 +1000683channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
684{
685 FD_SET(c->sock, readset);
686}
687
Ben Lindstrombba81212001-06-25 05:01:22 +0000688static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000689channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
690{
691 debug3("channel %d: waiting for connection", c->self);
692 FD_SET(c->sock, writeset);
693}
694
Ben Lindstrombba81212001-06-25 05:01:22 +0000695static void
Damien Millerb38eff82000-04-01 11:09:21 +1000696channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
697{
698 if (buffer_len(&c->input) < packet_get_maxsize())
699 FD_SET(c->sock, readset);
700 if (buffer_len(&c->output) > 0)
701 FD_SET(c->sock, writeset);
702}
703
Ben Lindstrombba81212001-06-25 05:01:22 +0000704static void
Damien Millerb38eff82000-04-01 11:09:21 +1000705channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
706{
707 /* test whether sockets are 'alive' for read/write */
708 if (c->istate == CHAN_INPUT_OPEN)
709 if (buffer_len(&c->input) < packet_get_maxsize())
710 FD_SET(c->sock, readset);
711 if (c->ostate == CHAN_OUTPUT_OPEN ||
712 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
713 if (buffer_len(&c->output) > 0) {
714 FD_SET(c->sock, writeset);
715 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
716 chan_obuf_empty(c);
717 }
718 }
719}
720
Ben Lindstrombba81212001-06-25 05:01:22 +0000721static void
Damien Miller33b13562000-04-04 14:38:59 +1000722channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
723{
724 if (c->istate == CHAN_INPUT_OPEN &&
725 c->remote_window > 0 &&
726 buffer_len(&c->input) < c->remote_window)
727 FD_SET(c->rfd, readset);
728 if (c->ostate == CHAN_OUTPUT_OPEN ||
729 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
730 if (buffer_len(&c->output) > 0) {
731 FD_SET(c->wfd, writeset);
732 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
733 chan_obuf_empty(c);
734 }
735 }
736 /** XXX check close conditions, too */
737 if (c->efd != -1) {
738 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
739 buffer_len(&c->extended) > 0)
740 FD_SET(c->efd, writeset);
741 else if (c->extended_usage == CHAN_EXTENDED_READ &&
742 buffer_len(&c->extended) < c->remote_window)
743 FD_SET(c->efd, readset);
744 }
745}
746
Ben Lindstrombba81212001-06-25 05:01:22 +0000747static void
Damien Millerb38eff82000-04-01 11:09:21 +1000748channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
749{
750 if (buffer_len(&c->input) == 0) {
751 packet_start(SSH_MSG_CHANNEL_CLOSE);
752 packet_put_int(c->remote_id);
753 packet_send();
754 c->type = SSH_CHANNEL_CLOSED;
Ben Lindstromc486d882001-04-11 16:08:34 +0000755 debug("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000756 }
757}
758
Ben Lindstrombba81212001-06-25 05:01:22 +0000759static void
Damien Millerb38eff82000-04-01 11:09:21 +1000760channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
761{
762 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000763 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000764 else
Damien Millerb38eff82000-04-01 11:09:21 +1000765 FD_SET(c->sock, writeset);
766}
767
768/*
769 * This is a special state for X11 authentication spoofing. An opened X11
770 * connection (when authentication spoofing is being done) remains in this
771 * state until the first packet has been completely read. The authentication
772 * data in that packet is then substituted by the real data if it matches the
773 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000774 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000775 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000776 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000777static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000778x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000779{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000780 u_char *ucp;
781 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000782
783 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000784 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000785 return 0;
786
787 /* Parse the lengths of variable-length fields. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000788 ucp = (u_char *) buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000789 if (ucp[0] == 0x42) { /* Byte order MSB first. */
790 proto_len = 256 * ucp[6] + ucp[7];
791 data_len = 256 * ucp[8] + ucp[9];
792 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
793 proto_len = ucp[6] + 256 * ucp[7];
794 data_len = ucp[8] + 256 * ucp[9];
795 } else {
796 debug("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100797 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000798 return -1;
799 }
800
801 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000802 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000803 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
804 return 0;
805
806 /* Check if authentication protocol matches. */
807 if (proto_len != strlen(x11_saved_proto) ||
808 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
809 debug("X11 connection uses different authentication protocol.");
810 return -1;
811 }
812 /* Check if authentication data matches our fake data. */
813 if (data_len != x11_fake_data_len ||
814 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
815 x11_fake_data, x11_fake_data_len) != 0) {
816 debug("X11 auth data does not match fake data.");
817 return -1;
818 }
819 /* Check fake data length */
820 if (x11_fake_data_len != x11_saved_data_len) {
821 error("X11 fake_data_len %d != saved_data_len %d",
822 x11_fake_data_len, x11_saved_data_len);
823 return -1;
824 }
825 /*
826 * Received authentication protocol and data match
827 * our fake data. Substitute the fake data with real
828 * data.
829 */
830 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
831 x11_saved_data, x11_saved_data_len);
832 return 1;
833}
834
Ben Lindstrombba81212001-06-25 05:01:22 +0000835static void
Damien Millerb38eff82000-04-01 11:09:21 +1000836channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
837{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000838 int ret = x11_open_helper(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000839 if (ret == 1) {
840 /* Start normal processing for the channel. */
841 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000842 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000843 } else if (ret == -1) {
844 /*
845 * We have received an X11 connection that has bad
846 * authentication information.
847 */
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000848 log("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000849 buffer_clear(&c->input);
850 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000851 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000852 c->sock = -1;
853 c->type = SSH_CHANNEL_CLOSED;
854 packet_start(SSH_MSG_CHANNEL_CLOSE);
855 packet_put_int(c->remote_id);
856 packet_send();
857 }
858}
859
Ben Lindstrombba81212001-06-25 05:01:22 +0000860static void
Damien Millerbd483e72000-04-30 10:00:53 +1000861channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000862{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000863 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000864
865 /* c->force_drain = 1; */
866
Damien Millerb38eff82000-04-01 11:09:21 +1000867 if (ret == 1) {
868 c->type = SSH_CHANNEL_OPEN;
Damien Miller30c3d422000-05-09 11:02:59 +1000869 if (compat20)
870 channel_pre_open_20(c, readset, writeset);
871 else
872 channel_pre_open_15(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000873 } else if (ret == -1) {
874 debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerbd483e72000-04-30 10:00:53 +1000875 chan_read_failed(c); /** force close? */
Damien Millerb38eff82000-04-01 11:09:21 +1000876 chan_write_failed(c);
877 debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
878 }
879}
880
Ben Lindstromb3921512001-04-11 15:57:50 +0000881/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000882static int
Ben Lindstromb3921512001-04-11 15:57:50 +0000883channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000884{
885 u_char *p, *host;
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000886 int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100887 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000888 struct {
889 u_int8_t version;
890 u_int8_t command;
891 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000892 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000893 } s4_req, s4_rsp;
894
Ben Lindstromb3921512001-04-11 15:57:50 +0000895 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000896
897 have = buffer_len(&c->input);
898 len = sizeof(s4_req);
899 if (have < len)
900 return 0;
901 p = buffer_ptr(&c->input);
902 for (found = 0, i = len; i < have; i++) {
903 if (p[i] == '\0') {
904 found = 1;
905 break;
906 }
907 if (i > 1024) {
908 /* the peer is probably sending garbage */
909 debug("channel %d: decode socks4: too long",
910 c->self);
911 return -1;
912 }
913 }
914 if (!found)
915 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000916 buffer_get(&c->input, (char *)&s4_req.version, 1);
917 buffer_get(&c->input, (char *)&s4_req.command, 1);
918 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000919 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000920 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000921 p = buffer_ptr(&c->input);
922 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000923 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000924 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000925 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000926 c->self, len, have);
927 strlcpy(username, p, sizeof(username));
928 buffer_consume(&c->input, len);
929 buffer_consume(&c->input, 1); /* trailing '\0' */
930
Ben Lindstromb3921512001-04-11 15:57:50 +0000931 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000932 strlcpy(c->path, host, sizeof(c->path));
933 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100934
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000935 debug("channel %d: dynamic request: socks4 host %s port %u command %u",
936 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000937
Ben Lindstromb3921512001-04-11 15:57:50 +0000938 if (s4_req.command != 1) {
939 debug("channel %d: cannot handle: socks4 cn %d",
940 c->self, s4_req.command);
941 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000942 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000943 s4_rsp.version = 0; /* vn: 0 for reply */
944 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000945 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000946 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000947 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000948 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000949}
950
Ben Lindstromb3921512001-04-11 15:57:50 +0000951/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +0000952static void
Ben Lindstromb3921512001-04-11 15:57:50 +0000953channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
954{
955 u_char *p;
956 int have, ret;
957
958 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +1000959 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +0000960 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +0000961 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +0000962 /* check if the fixed size part of the packet is in buffer. */
963 if (have < 4) {
964 /* need more */
965 FD_SET(c->sock, readset);
966 return;
967 }
968 /* try to guess the protocol */
969 p = buffer_ptr(&c->input);
970 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000971 case 0x04:
972 ret = channel_decode_socks4(c, readset, writeset);
973 break;
Ben Lindstromb3921512001-04-11 15:57:50 +0000974 default:
975 ret = -1;
976 break;
977 }
978 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000979 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +0000980 } else if (ret == 0) {
981 debug2("channel %d: pre_dynamic: need more", c->self);
982 /* need more */
983 FD_SET(c->sock, readset);
984 } else {
985 /* switch to the next state */
986 c->type = SSH_CHANNEL_OPENING;
987 port_open_helper(c, "direct-tcpip");
988 }
989}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000990
Damien Millerb38eff82000-04-01 11:09:21 +1000991/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000992static void
Damien Millerb38eff82000-04-01 11:09:21 +1000993channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
994{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000995 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +1000996 struct sockaddr addr;
Ben Lindstrom73f57be2001-12-07 17:28:34 +0000997 int newsock, on = 1;
Damien Millerb38eff82000-04-01 11:09:21 +1000998 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +1100999 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001000 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001001
1002 if (FD_ISSET(c->sock, readset)) {
1003 debug("X11 connection requested.");
1004 addrlen = sizeof(addr);
1005 newsock = accept(c->sock, &addr, &addrlen);
1006 if (newsock < 0) {
1007 error("accept: %.100s", strerror(errno));
1008 return;
1009 }
Ben Lindstrom73f57be2001-12-07 17:28:34 +00001010 if (setsockopt(newsock, IPPROTO_TCP, TCP_NODELAY, &on,
1011 sizeof on) == -1)
1012 error("setsockopt TCP_NODELAY: %.100s",
1013 strerror(errno));
Damien Millerd83ff352001-01-30 09:19:34 +11001014 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001015 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001016 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001017 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001018
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001019 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001020 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1021 c->local_window_max, c->local_maxpacket,
Damien Miller69b69aa2000-10-28 14:19:58 +11001022 0, xstrdup(buf), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001023 if (nc == NULL) {
1024 close(newsock);
1025 xfree(remote_ipaddr);
1026 return;
1027 }
Damien Millerbd483e72000-04-30 10:00:53 +10001028 if (compat20) {
1029 packet_start(SSH2_MSG_CHANNEL_OPEN);
1030 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001031 packet_put_int(nc->self);
Damien Millerbd483e72000-04-30 10:00:53 +10001032 packet_put_int(c->local_window_max);
1033 packet_put_int(c->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001034 /* originator ipaddr and port */
1035 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001036 if (datafellows & SSH_BUG_X11FWD) {
1037 debug("ssh2 x11 bug compat mode");
1038 } else {
1039 packet_put_int(remote_port);
1040 }
Damien Millerbd483e72000-04-30 10:00:53 +10001041 packet_send();
1042 } else {
1043 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001044 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001045 if (packet_get_protocol_flags() &
1046 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001047 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001048 packet_send();
1049 }
Damien Millerd83ff352001-01-30 09:19:34 +11001050 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001051 }
1052}
1053
Ben Lindstrombba81212001-06-25 05:01:22 +00001054static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001055port_open_helper(Channel *c, char *rtype)
1056{
1057 int direct;
1058 char buf[1024];
1059 char *remote_ipaddr = get_peer_ipaddr(c->sock);
1060 u_short remote_port = get_peer_port(c->sock);
1061
1062 direct = (strcmp(rtype, "direct-tcpip") == 0);
1063
1064 snprintf(buf, sizeof buf,
1065 "%s: listening port %d for %.100s port %d, "
1066 "connect from %.200s port %d",
1067 rtype, c->listening_port, c->path, c->host_port,
1068 remote_ipaddr, remote_port);
1069
1070 xfree(c->remote_name);
1071 c->remote_name = xstrdup(buf);
1072
1073 if (compat20) {
1074 packet_start(SSH2_MSG_CHANNEL_OPEN);
1075 packet_put_cstring(rtype);
1076 packet_put_int(c->self);
1077 packet_put_int(c->local_window_max);
1078 packet_put_int(c->local_maxpacket);
1079 if (direct) {
1080 /* target host, port */
1081 packet_put_cstring(c->path);
1082 packet_put_int(c->host_port);
1083 } else {
1084 /* listen address, port */
1085 packet_put_cstring(c->path);
1086 packet_put_int(c->listening_port);
1087 }
1088 /* originator host and port */
1089 packet_put_cstring(remote_ipaddr);
1090 packet_put_int(remote_port);
1091 packet_send();
1092 } else {
1093 packet_start(SSH_MSG_PORT_OPEN);
1094 packet_put_int(c->self);
1095 packet_put_cstring(c->path);
1096 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001097 if (packet_get_protocol_flags() &
1098 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001099 packet_put_cstring(c->remote_name);
1100 packet_send();
1101 }
1102 xfree(remote_ipaddr);
1103}
1104
Damien Millerb38eff82000-04-01 11:09:21 +10001105/*
1106 * This socket is listening for connections to a forwarded TCP/IP port.
1107 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001108static void
Damien Millerb38eff82000-04-01 11:09:21 +10001109channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
1110{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001111 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001112 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001113 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001114 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001115 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001116
Damien Millerb38eff82000-04-01 11:09:21 +10001117 if (FD_ISSET(c->sock, readset)) {
1118 debug("Connection to port %d forwarding "
1119 "to %.100s port %d requested.",
1120 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001121
Damien Miller4623a752001-10-10 15:03:58 +10001122 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1123 nextstate = SSH_CHANNEL_OPENING;
1124 rtype = "forwarded-tcpip";
1125 } else {
1126 if (c->host_port == 0) {
1127 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001128 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001129 } else {
1130 nextstate = SSH_CHANNEL_OPENING;
1131 rtype = "direct-tcpip";
1132 }
1133 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001134
Damien Millerb38eff82000-04-01 11:09:21 +10001135 addrlen = sizeof(addr);
1136 newsock = accept(c->sock, &addr, &addrlen);
1137 if (newsock < 0) {
1138 error("accept: %.100s", strerror(errno));
1139 return;
1140 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001141 nc = channel_new(rtype,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001142 nextstate, newsock, newsock, -1,
Damien Millerb38eff82000-04-01 11:09:21 +10001143 c->local_window_max, c->local_maxpacket,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001144 0, xstrdup(rtype), 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001145 if (nc == NULL) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001146 error("channel_post_port_listener: no new channel:");
1147 close(newsock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001148 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001149 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001150 nc->listening_port = c->listening_port;
1151 nc->host_port = c->host_port;
1152 strlcpy(nc->path, c->path, sizeof(nc->path));
1153
Damien Miller4623a752001-10-10 15:03:58 +10001154 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1155 /*
1156 * do not call the channel_post handler until
1157 * this flag has been reset by a pre-handler.
1158 * otherwise the FD_ISSET calls might overflow
1159 */
1160 nc->delayed = 1;
1161 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001162 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001163 }
Damien Millerb38eff82000-04-01 11:09:21 +10001164 }
1165}
1166
1167/*
1168 * This is the authentication agent socket listening for connections from
1169 * clients.
1170 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001171static void
Damien Millerb38eff82000-04-01 11:09:21 +10001172channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
1173{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001174 Channel *nc;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001175 char *name;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001176 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001177 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001178 socklen_t addrlen;
1179
1180 if (FD_ISSET(c->sock, readset)) {
1181 addrlen = sizeof(addr);
1182 newsock = accept(c->sock, &addr, &addrlen);
1183 if (newsock < 0) {
1184 error("accept from auth socket: %.100s", strerror(errno));
1185 return;
1186 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001187 name = xstrdup("accepted auth socket");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001188 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001189 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1190 c->local_window_max, c->local_maxpacket,
Ben Lindstrome9c99912001-06-09 00:41:05 +00001191 0, name, 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001192 if (nc == NULL) {
1193 error("channel_post_auth_listener: channel_new failed");
Ben Lindstrome9c99912001-06-09 00:41:05 +00001194 xfree(name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001195 close(newsock);
1196 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11001197 if (compat20) {
1198 packet_start(SSH2_MSG_CHANNEL_OPEN);
1199 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001200 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001201 packet_put_int(c->local_window_max);
1202 packet_put_int(c->local_maxpacket);
1203 } else {
1204 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001205 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001206 }
Damien Millerb38eff82000-04-01 11:09:21 +10001207 packet_send();
1208 }
1209}
1210
Ben Lindstrombba81212001-06-25 05:01:22 +00001211static void
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001212channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
1213{
Ben Lindstrom69128662001-05-08 20:07:39 +00001214 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001215 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001216
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001217 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001218 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err,
1219 &sz) < 0) {
1220 err = errno;
1221 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001222 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001223 if (err == 0) {
1224 debug("channel %d: connected", c->self);
1225 c->type = SSH_CHANNEL_OPEN;
1226 if (compat20) {
1227 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1228 packet_put_int(c->remote_id);
1229 packet_put_int(c->self);
1230 packet_put_int(c->local_window);
1231 packet_put_int(c->local_maxpacket);
1232 } else {
1233 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1234 packet_put_int(c->remote_id);
1235 packet_put_int(c->self);
1236 }
1237 } else {
1238 debug("channel %d: not connected: %s",
1239 c->self, strerror(err));
1240 if (compat20) {
1241 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1242 packet_put_int(c->remote_id);
1243 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1244 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1245 packet_put_cstring(strerror(err));
1246 packet_put_cstring("");
1247 }
1248 } else {
1249 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1250 packet_put_int(c->remote_id);
1251 }
1252 chan_mark_dead(c);
1253 }
1254 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001255 }
1256}
1257
Ben Lindstrombba81212001-06-25 05:01:22 +00001258static int
Damien Millerb38eff82000-04-01 11:09:21 +10001259channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
1260{
1261 char buf[16*1024];
1262 int len;
1263
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001264 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001265 FD_ISSET(c->rfd, readset)) {
1266 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001267 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1268 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001269 if (len <= 0) {
Damien Millerbd483e72000-04-30 10:00:53 +10001270 debug("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001271 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001272 if (c->type != SSH_CHANNEL_OPEN) {
1273 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001274 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001275 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001276 } else if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001277 buffer_consume(&c->output, buffer_len(&c->output));
1278 c->type = SSH_CHANNEL_INPUT_DRAINING;
Ben Lindstrome9c99912001-06-09 00:41:05 +00001279 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001280 } else {
1281 chan_read_failed(c);
1282 }
1283 return -1;
1284 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001285 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001286 if (c->input_filter(c, buf, len) == -1) {
Ben Lindstromc486d882001-04-11 16:08:34 +00001287 debug("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001288 chan_read_failed(c);
1289 }
1290 } else {
1291 buffer_append(&c->input, buf, len);
1292 }
Damien Millerb38eff82000-04-01 11:09:21 +10001293 }
1294 return 1;
1295}
Ben Lindstrombba81212001-06-25 05:01:22 +00001296static int
Damien Millerb38eff82000-04-01 11:09:21 +10001297channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
1298{
Ben Lindstrome229b252001-03-05 06:28:06 +00001299 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001300 u_char *data;
1301 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001302 int len;
1303
1304 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001305 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001306 FD_ISSET(c->wfd, writeset) &&
1307 buffer_len(&c->output) > 0) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001308 data = buffer_ptr(&c->output);
1309 dlen = buffer_len(&c->output);
1310 len = write(c->wfd, data, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001311 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1312 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001313 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001314 if (c->type != SSH_CHANNEL_OPEN) {
1315 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001316 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001317 return -1;
1318 } else if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001319 buffer_consume(&c->output, buffer_len(&c->output));
Ben Lindstrome9c99912001-06-09 00:41:05 +00001320 debug("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001321 c->type = SSH_CHANNEL_INPUT_DRAINING;
1322 } else {
1323 chan_write_failed(c);
1324 }
1325 return -1;
1326 }
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001327 if (compat20 && c->isatty && dlen >= 1 && data[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001328 if (tcgetattr(c->wfd, &tio) == 0 &&
1329 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1330 /*
1331 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001332 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001333 * size of a SSH2_MSG_CHANNEL_DATA message
1334 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +11001335 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001336 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001337 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001338 }
1339 }
Damien Millerb38eff82000-04-01 11:09:21 +10001340 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001341 if (compat20 && len > 0) {
1342 c->local_consumed += len;
1343 }
1344 }
1345 return 1;
1346}
Ben Lindstrombba81212001-06-25 05:01:22 +00001347static int
Damien Miller33b13562000-04-04 14:38:59 +10001348channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
1349{
1350 char buf[16*1024];
1351 int len;
1352
Damien Miller1383bd82000-04-06 12:32:37 +10001353/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001354 if (c->efd != -1) {
1355 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1356 FD_ISSET(c->efd, writeset) &&
1357 buffer_len(&c->extended) > 0) {
1358 len = write(c->efd, buffer_ptr(&c->extended),
1359 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001360 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001361 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001362 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1363 return 1;
1364 if (len <= 0) {
1365 debug2("channel %d: closing write-efd %d",
1366 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001367 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001368 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001369 buffer_consume(&c->extended, len);
1370 c->local_consumed += len;
1371 }
1372 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1373 FD_ISSET(c->efd, readset)) {
1374 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001375 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001376 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001377 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1378 return 1;
1379 if (len <= 0) {
1380 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001381 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001382 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001383 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001384 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001385 }
Damien Miller33b13562000-04-04 14:38:59 +10001386 }
1387 }
1388 return 1;
1389}
Ben Lindstrombba81212001-06-25 05:01:22 +00001390static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001391channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001392{
Ben Lindstromb3921512001-04-11 15:57:50 +00001393 if (c->type == SSH_CHANNEL_OPEN &&
1394 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001395 c->local_window < c->local_window_max/2 &&
1396 c->local_consumed > 0) {
1397 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1398 packet_put_int(c->remote_id);
1399 packet_put_int(c->local_consumed);
1400 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001401 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001402 c->self, c->local_window,
1403 c->local_consumed);
1404 c->local_window += c->local_consumed;
1405 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001406 }
1407 return 1;
1408}
1409
Ben Lindstrombba81212001-06-25 05:01:22 +00001410static void
Damien Millerb38eff82000-04-01 11:09:21 +10001411channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
1412{
Damien Miller4623a752001-10-10 15:03:58 +10001413 if (c->delayed)
1414 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001415 channel_handle_rfd(c, readset, writeset);
1416 channel_handle_wfd(c, readset, writeset);
1417}
1418
Ben Lindstrombba81212001-06-25 05:01:22 +00001419static void
Damien Miller33b13562000-04-04 14:38:59 +10001420channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
1421{
Damien Miller4623a752001-10-10 15:03:58 +10001422 if (c->delayed)
1423 return;
Damien Miller33b13562000-04-04 14:38:59 +10001424 channel_handle_rfd(c, readset, writeset);
1425 channel_handle_wfd(c, readset, writeset);
1426 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001427
1428 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001429}
1430
Ben Lindstrombba81212001-06-25 05:01:22 +00001431static void
Damien Millerb38eff82000-04-01 11:09:21 +10001432channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1433{
1434 int len;
1435 /* Send buffered output data to the socket. */
1436 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1437 len = write(c->sock, buffer_ptr(&c->output),
1438 buffer_len(&c->output));
1439 if (len <= 0)
1440 buffer_consume(&c->output, buffer_len(&c->output));
1441 else
1442 buffer_consume(&c->output, len);
1443 }
1444}
1445
Ben Lindstrombba81212001-06-25 05:01:22 +00001446static void
Damien Miller33b13562000-04-04 14:38:59 +10001447channel_handler_init_20(void)
1448{
1449 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
Damien Millerbd483e72000-04-30 10:00:53 +10001450 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001451 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001452 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001453 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001454 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001455 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001456 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001457
1458 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
1459 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001460 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001461 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001462 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001463 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Ben Lindstromb3921512001-04-11 15:57:50 +00001464 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2;
Damien Miller33b13562000-04-04 14:38:59 +10001465}
1466
Ben Lindstrombba81212001-06-25 05:01:22 +00001467static void
Damien Millerb38eff82000-04-01 11:09:21 +10001468channel_handler_init_13(void)
1469{
1470 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1471 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1472 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1473 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1474 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1475 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1476 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001477 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001478 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001479
1480 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
1481 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1482 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1483 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1484 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001485 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Ben Lindstromb3921512001-04-11 15:57:50 +00001486 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
Damien Millerb38eff82000-04-01 11:09:21 +10001487}
1488
Ben Lindstrombba81212001-06-25 05:01:22 +00001489static void
Damien Millerb38eff82000-04-01 11:09:21 +10001490channel_handler_init_15(void)
1491{
1492 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
Damien Millerbd483e72000-04-30 10:00:53 +10001493 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001494 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1495 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1496 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001497 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001498 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001499
1500 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1501 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1502 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1503 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001504 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Ben Lindstromb3921512001-04-11 15:57:50 +00001505 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
Damien Millerb38eff82000-04-01 11:09:21 +10001506}
1507
Ben Lindstrombba81212001-06-25 05:01:22 +00001508static void
Damien Millerb38eff82000-04-01 11:09:21 +10001509channel_handler_init(void)
1510{
1511 int i;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001512 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001513 channel_pre[i] = NULL;
1514 channel_post[i] = NULL;
1515 }
Damien Miller33b13562000-04-04 14:38:59 +10001516 if (compat20)
1517 channel_handler_init_20();
1518 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001519 channel_handler_init_13();
1520 else
1521 channel_handler_init_15();
1522}
1523
Damien Miller3ec27592001-10-12 11:35:04 +10001524/* gc dead channels */
1525static void
1526channel_garbage_collect(Channel *c)
1527{
1528 if (c == NULL)
1529 return;
1530 if (c->detach_user != NULL) {
1531 if (!chan_is_dead(c, 0))
1532 return;
1533 debug("channel %d: gc: notify user", c->self);
1534 c->detach_user(c->self, NULL);
1535 /* if we still have a callback */
1536 if (c->detach_user != NULL)
1537 return;
1538 debug("channel %d: gc: user detached", c->self);
1539 }
1540 if (!chan_is_dead(c, 1))
1541 return;
1542 debug("channel %d: garbage collecting", c->self);
1543 channel_free(c);
1544}
1545
Ben Lindstrombba81212001-06-25 05:01:22 +00001546static void
Damien Millerb38eff82000-04-01 11:09:21 +10001547channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1548{
1549 static int did_init = 0;
1550 int i;
1551 Channel *c;
1552
1553 if (!did_init) {
1554 channel_handler_init();
1555 did_init = 1;
1556 }
1557 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001558 c = channels[i];
1559 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001560 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001561 if (ftab[c->type] != NULL)
1562 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001563 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001564 }
1565}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001566
Ben Lindstrome9c99912001-06-09 00:41:05 +00001567/*
1568 * Allocate/update select bitmasks and add any bits relevant to channels in
1569 * select bitmasks.
1570 */
Damien Miller4af51302000-04-16 11:18:38 +10001571void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001572channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001573 int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001574{
Damien Miller5e953212001-01-30 09:14:00 +11001575 int n;
1576 u_int sz;
1577
1578 n = MAX(*maxfdp, channel_max_fd);
1579
1580 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001581 /* perhaps check sz < nalloc/2 and shrink? */
1582 if (*readsetp == NULL || sz > *nallocp) {
1583 *readsetp = xrealloc(*readsetp, sz);
1584 *writesetp = xrealloc(*writesetp, sz);
1585 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001586 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001587 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001588 memset(*readsetp, 0, sz);
1589 memset(*writesetp, 0, sz);
1590
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001591 if (!rekeying)
1592 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001593}
1594
Ben Lindstrome9c99912001-06-09 00:41:05 +00001595/*
1596 * After select, perform any appropriate operations for channels which have
1597 * events pending.
1598 */
Damien Miller4af51302000-04-16 11:18:38 +10001599void
Damien Miller95def091999-11-25 00:26:21 +11001600channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001601{
Damien Millerb38eff82000-04-01 11:09:21 +10001602 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001603}
1604
Ben Lindstrome9c99912001-06-09 00:41:05 +00001605
Damien Miller5e953212001-01-30 09:14:00 +11001606/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001607
Damien Miller4af51302000-04-16 11:18:38 +10001608void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001609channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001610{
Damien Miller95def091999-11-25 00:26:21 +11001611 int len, i;
Damien Millerb38eff82000-04-01 11:09:21 +10001612 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001613
Damien Miller95def091999-11-25 00:26:21 +11001614 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001615 c = channels[i];
1616 if (c == NULL)
1617 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001618
Ben Lindstrome9c99912001-06-09 00:41:05 +00001619 /*
1620 * We are only interested in channels that can have buffered
1621 * incoming data.
1622 */
Damien Miller34132e52000-01-14 15:45:46 +11001623 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001624 if (c->type != SSH_CHANNEL_OPEN &&
1625 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001626 continue;
1627 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001628 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001629 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001630 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001631 if (compat20 &&
1632 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001633 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001634 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001635 continue;
1636 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001637
Damien Miller95def091999-11-25 00:26:21 +11001638 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001639 if ((c->istate == CHAN_INPUT_OPEN ||
1640 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1641 (len = buffer_len(&c->input)) > 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00001642 /*
1643 * Send some data for the other side over the secure
1644 * connection.
1645 */
Damien Miller33b13562000-04-04 14:38:59 +10001646 if (compat20) {
1647 if (len > c->remote_window)
1648 len = c->remote_window;
1649 if (len > c->remote_maxpacket)
1650 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001651 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001652 if (packet_is_interactive()) {
1653 if (len > 1024)
1654 len = 512;
1655 } else {
1656 /* Keep the packets at reasonable size. */
1657 if (len > packet_get_maxsize()/2)
1658 len = packet_get_maxsize()/2;
1659 }
Damien Miller95def091999-11-25 00:26:21 +11001660 }
Damien Millerb38eff82000-04-01 11:09:21 +10001661 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001662 packet_start(compat20 ?
1663 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001664 packet_put_int(c->remote_id);
1665 packet_put_string(buffer_ptr(&c->input), len);
1666 packet_send();
1667 buffer_consume(&c->input, len);
1668 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001669 }
1670 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001671 if (compat13)
1672 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001673 /*
1674 * input-buffer is empty and read-socket shutdown:
1675 * tell peer, that we will not send more data: send IEOF
1676 */
Damien Millerb38eff82000-04-01 11:09:21 +10001677 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001678 }
Damien Miller33b13562000-04-04 14:38:59 +10001679 /* Send extended data, i.e. stderr */
1680 if (compat20 &&
1681 c->remote_window > 0 &&
1682 (len = buffer_len(&c->extended)) > 0 &&
1683 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001684 debug2("channel %d: rwin %d elen %d euse %d",
1685 c->self, c->remote_window, buffer_len(&c->extended),
1686 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001687 if (len > c->remote_window)
1688 len = c->remote_window;
1689 if (len > c->remote_maxpacket)
1690 len = c->remote_maxpacket;
1691 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1692 packet_put_int(c->remote_id);
1693 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1694 packet_put_string(buffer_ptr(&c->extended), len);
1695 packet_send();
1696 buffer_consume(&c->extended, len);
1697 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001698 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001699 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001700 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001701}
1702
Ben Lindstrome9c99912001-06-09 00:41:05 +00001703
1704/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001705
Damien Miller4af51302000-04-16 11:18:38 +10001706void
Damien Miller62cee002000-09-23 17:15:56 +11001707channel_input_data(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001708{
Damien Miller34132e52000-01-14 15:45:46 +11001709 int id;
Damien Miller95def091999-11-25 00:26:21 +11001710 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001711 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001712 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001713
Damien Miller95def091999-11-25 00:26:21 +11001714 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001715 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001716 c = channel_lookup(id);
1717 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001718 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001719
Damien Miller95def091999-11-25 00:26:21 +11001720 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001721 if (c->type != SSH_CHANNEL_OPEN &&
1722 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001723 return;
1724
1725 /* same for protocol 1.5 if output end is no longer open */
Damien Millerb38eff82000-04-01 11:09:21 +10001726 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
Damien Miller95def091999-11-25 00:26:21 +11001727 return;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001728
Damien Miller95def091999-11-25 00:26:21 +11001729 /* Get the data. */
1730 data = packet_get_string(&data_len);
Damien Miller4af51302000-04-16 11:18:38 +10001731 packet_done();
Damien Millerb38eff82000-04-01 11:09:21 +10001732
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001733 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001734 if (data_len > c->local_maxpacket) {
1735 log("channel %d: rcvd big packet %d, maxpack %d",
1736 c->self, data_len, c->local_maxpacket);
1737 }
1738 if (data_len > c->local_window) {
1739 log("channel %d: rcvd too much data %d, win %d",
1740 c->self, data_len, c->local_window);
1741 xfree(data);
1742 return;
1743 }
1744 c->local_window -= data_len;
1745 }else{
1746 packet_integrity_check(plen, 4 + 4 + data_len, type);
1747 }
Damien Millerb38eff82000-04-01 11:09:21 +10001748 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001749 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001750}
Ben Lindstrome9c99912001-06-09 00:41:05 +00001751
Damien Miller4af51302000-04-16 11:18:38 +10001752void
Damien Miller62cee002000-09-23 17:15:56 +11001753channel_input_extended_data(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001754{
1755 int id;
1756 int tcode;
1757 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001758 u_int data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001759 Channel *c;
1760
1761 /* Get the channel number and verify it. */
1762 id = packet_get_int();
1763 c = channel_lookup(id);
1764
1765 if (c == NULL)
1766 packet_disconnect("Received extended_data for bad channel %d.", id);
1767 if (c->type != SSH_CHANNEL_OPEN) {
1768 log("channel %d: ext data for non open", id);
1769 return;
1770 }
1771 tcode = packet_get_int();
1772 if (c->efd == -1 ||
1773 c->extended_usage != CHAN_EXTENDED_WRITE ||
1774 tcode != SSH2_EXTENDED_DATA_STDERR) {
1775 log("channel %d: bad ext data", c->self);
1776 return;
1777 }
1778 data = packet_get_string(&data_len);
Damien Miller4af51302000-04-16 11:18:38 +10001779 packet_done();
Damien Miller33b13562000-04-04 14:38:59 +10001780 if (data_len > c->local_window) {
1781 log("channel %d: rcvd too much extended_data %d, win %d",
1782 c->self, data_len, c->local_window);
1783 xfree(data);
1784 return;
1785 }
Damien Millerd3444942000-09-30 14:20:03 +11001786 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001787 c->local_window -= data_len;
1788 buffer_append(&c->extended, data, data_len);
1789 xfree(data);
1790}
1791
Damien Miller4af51302000-04-16 11:18:38 +10001792void
Damien Miller62cee002000-09-23 17:15:56 +11001793channel_input_ieof(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001794{
1795 int id;
1796 Channel *c;
1797
1798 packet_integrity_check(plen, 4, type);
1799
1800 id = packet_get_int();
1801 c = channel_lookup(id);
1802 if (c == NULL)
1803 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1804 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001805
1806 /* XXX force input close */
1807 if (c->force_drain) {
1808 debug("channel %d: FORCE input drain", c->self);
1809 c->istate = CHAN_INPUT_WAIT_DRAIN;
1810 }
1811
Damien Millerb38eff82000-04-01 11:09:21 +10001812}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001813
Damien Miller4af51302000-04-16 11:18:38 +10001814void
Damien Miller62cee002000-09-23 17:15:56 +11001815channel_input_close(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001816{
Damien Millerb38eff82000-04-01 11:09:21 +10001817 int id;
1818 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001819
Damien Millerb38eff82000-04-01 11:09:21 +10001820 packet_integrity_check(plen, 4, type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001821
Damien Millerb38eff82000-04-01 11:09:21 +10001822 id = packet_get_int();
1823 c = channel_lookup(id);
1824 if (c == NULL)
1825 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001826
1827 /*
1828 * Send a confirmation that we have closed the channel and no more
1829 * data is coming for it.
1830 */
Damien Miller95def091999-11-25 00:26:21 +11001831 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001832 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001833 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001834
Damien Miller5428f641999-11-25 11:54:57 +11001835 /*
1836 * If the channel is in closed state, we have sent a close request,
1837 * and the other side will eventually respond with a confirmation.
1838 * Thus, we cannot free the channel here, because then there would be
1839 * no-one to receive the confirmation. The channel gets freed when
1840 * the confirmation arrives.
1841 */
Damien Millerb38eff82000-04-01 11:09:21 +10001842 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11001843 /*
1844 * Not a closed channel - mark it as draining, which will
1845 * cause it to be freed later.
1846 */
Damien Millerb38eff82000-04-01 11:09:21 +10001847 buffer_consume(&c->input, buffer_len(&c->input));
1848 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11001849 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001850}
1851
Damien Millerb38eff82000-04-01 11:09:21 +10001852/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10001853void
Damien Miller62cee002000-09-23 17:15:56 +11001854channel_input_oclose(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001855{
Damien Millerb38eff82000-04-01 11:09:21 +10001856 int id = packet_get_int();
1857 Channel *c = channel_lookup(id);
1858 packet_integrity_check(plen, 4, type);
1859 if (c == NULL)
1860 packet_disconnect("Received oclose for nonexistent channel %d.", id);
1861 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001862}
1863
Damien Miller4af51302000-04-16 11:18:38 +10001864void
Damien Miller62cee002000-09-23 17:15:56 +11001865channel_input_close_confirmation(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001866{
1867 int id = packet_get_int();
1868 Channel *c = channel_lookup(id);
1869
Damien Miller4af51302000-04-16 11:18:38 +10001870 packet_done();
Damien Millerb38eff82000-04-01 11:09:21 +10001871 if (c == NULL)
1872 packet_disconnect("Received close confirmation for "
1873 "out-of-range channel %d.", id);
1874 if (c->type != SSH_CHANNEL_CLOSED)
1875 packet_disconnect("Received close confirmation for "
1876 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001877 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001878}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001879
Damien Miller4af51302000-04-16 11:18:38 +10001880void
Damien Miller62cee002000-09-23 17:15:56 +11001881channel_input_open_confirmation(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001882{
Damien Millerb38eff82000-04-01 11:09:21 +10001883 int id, remote_id;
1884 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001885
Damien Miller33b13562000-04-04 14:38:59 +10001886 if (!compat20)
1887 packet_integrity_check(plen, 4 + 4, type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001888
Damien Millerb38eff82000-04-01 11:09:21 +10001889 id = packet_get_int();
1890 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001891
Damien Millerb38eff82000-04-01 11:09:21 +10001892 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1893 packet_disconnect("Received open confirmation for "
1894 "non-opening channel %d.", id);
1895 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11001896 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10001897 c->remote_id = remote_id;
1898 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10001899
1900 if (compat20) {
1901 c->remote_window = packet_get_int();
1902 c->remote_maxpacket = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10001903 packet_done();
Damien Miller33b13562000-04-04 14:38:59 +10001904 if (c->cb_fn != NULL && c->cb_event == type) {
Damien Millerd3444942000-09-30 14:20:03 +11001905 debug2("callback start");
Damien Miller33b13562000-04-04 14:38:59 +10001906 c->cb_fn(c->self, c->cb_arg);
Damien Millerd3444942000-09-30 14:20:03 +11001907 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001908 }
1909 debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1910 c->remote_window, c->remote_maxpacket);
1911 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001912}
1913
Ben Lindstrombba81212001-06-25 05:01:22 +00001914static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00001915reason2txt(int reason)
1916{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001917 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001918 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
1919 return "administratively prohibited";
1920 case SSH2_OPEN_CONNECT_FAILED:
1921 return "connect failed";
1922 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
1923 return "unknown channel type";
1924 case SSH2_OPEN_RESOURCE_SHORTAGE:
1925 return "resource shortage";
1926 }
Ben Lindstrome2595442001-06-05 20:01:39 +00001927 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00001928}
1929
Damien Miller4af51302000-04-16 11:18:38 +10001930void
Damien Miller62cee002000-09-23 17:15:56 +11001931channel_input_open_failure(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001932{
Kevin Steves12057502001-02-05 14:54:34 +00001933 int id, reason;
1934 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10001935 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001936
Damien Miller33b13562000-04-04 14:38:59 +10001937 if (!compat20)
1938 packet_integrity_check(plen, 4, type);
Damien Millerb38eff82000-04-01 11:09:21 +10001939
1940 id = packet_get_int();
1941 c = channel_lookup(id);
1942
1943 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1944 packet_disconnect("Received open failure for "
1945 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10001946 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00001947 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00001948 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00001949 msg = packet_get_string(NULL);
1950 lang = packet_get_string(NULL);
1951 }
Damien Miller4af51302000-04-16 11:18:38 +10001952 packet_done();
Ben Lindstrom69128662001-05-08 20:07:39 +00001953 log("channel %d: open failed: %s%s%s", id,
1954 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00001955 if (msg != NULL)
1956 xfree(msg);
1957 if (lang != NULL)
1958 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10001959 }
Damien Miller95def091999-11-25 00:26:21 +11001960 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001961 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001962}
1963
Damien Miller33b13562000-04-04 14:38:59 +10001964void
Damien Miller62cee002000-09-23 17:15:56 +11001965channel_input_channel_request(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001966{
1967 int id;
1968 Channel *c;
1969
1970 id = packet_get_int();
1971 c = channel_lookup(id);
1972
1973 if (c == NULL ||
1974 (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
1975 packet_disconnect("Received request for "
1976 "non-open channel %d.", id);
1977 if (c->cb_fn != NULL && c->cb_event == type) {
Damien Millerd3444942000-09-30 14:20:03 +11001978 debug2("callback start");
Damien Miller33b13562000-04-04 14:38:59 +10001979 c->cb_fn(c->self, c->cb_arg);
Damien Millerd3444942000-09-30 14:20:03 +11001980 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001981 } else {
1982 char *service = packet_get_string(NULL);
Ben Lindstromcc74df72001-03-05 06:20:14 +00001983 debug("channel %d: rcvd request for %s", c->self, service);
Damien Millerd3444942000-09-30 14:20:03 +11001984 debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
Damien Miller33b13562000-04-04 14:38:59 +10001985 xfree(service);
1986 }
1987}
1988
Damien Miller4af51302000-04-16 11:18:38 +10001989void
Damien Miller62cee002000-09-23 17:15:56 +11001990channel_input_window_adjust(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001991{
1992 Channel *c;
1993 int id, adjust;
1994
1995 if (!compat20)
1996 return;
1997
1998 /* Get the channel number and verify it. */
1999 id = packet_get_int();
2000 c = channel_lookup(id);
2001
2002 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
2003 log("Received window adjust for "
2004 "non-open channel %d.", id);
2005 return;
2006 }
2007 adjust = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10002008 packet_done();
Damien Millerd3444942000-09-30 14:20:03 +11002009 debug2("channel %d: rcvd adjust %d", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002010 c->remote_window += adjust;
2011}
2012
Damien Miller4af51302000-04-16 11:18:38 +10002013void
Ben Lindstrome9c99912001-06-09 00:41:05 +00002014channel_input_port_open(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002015{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002016 Channel *c = NULL;
2017 u_short host_port;
2018 char *host, *originator_string;
2019 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002020
Ben Lindstrome9c99912001-06-09 00:41:05 +00002021 remote_id = packet_get_int();
2022 host = packet_get_string(NULL);
2023 host_port = packet_get_int();
2024
2025 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2026 originator_string = packet_get_string(NULL);
2027 } else {
2028 originator_string = xstrdup("unknown (remote did not supply name)");
2029 }
2030 packet_done();
2031 sock = channel_connect_to(host, host_port);
2032 if (sock != -1) {
2033 c = channel_new("connected socket",
2034 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2035 originator_string, 1);
2036 if (c == NULL) {
2037 error("channel_input_port_open: channel_new failed");
2038 close(sock);
2039 } else {
2040 c->remote_id = remote_id;
Damien Miller95def091999-11-25 00:26:21 +11002041 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002042 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002043 if (c == NULL) {
2044 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2045 packet_put_int(remote_id);
2046 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002047 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002048 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002049}
2050
2051
Ben Lindstrome9c99912001-06-09 00:41:05 +00002052/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002053
Ben Lindstrom908afed2001-10-03 17:34:59 +00002054void
2055channel_set_af(int af)
2056{
2057 IPv4or6 = af;
2058}
2059
Damien Miller5428f641999-11-25 11:54:57 +11002060/*
2061 * Initiate forwarding of connections to local port "port" through the secure
2062 * channel to host:port from remote side.
2063 */
Kevin Steves12057502001-02-05 14:54:34 +00002064int
Damien Miller0bc1bd82000-11-13 22:57:25 +11002065channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
2066 u_short port_to_connect, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002067{
Kevin Steves12057502001-02-05 14:54:34 +00002068 return channel_request_forwarding(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002069 NULL, listen_port,
2070 host_to_connect, port_to_connect,
2071 gateway_ports, /*remote_fwd*/ 0);
2072}
2073
2074/*
2075 * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
2076 * (SSH_CHANNEL_RPORT_LISTENER).
2077 */
Kevin Steves12057502001-02-05 14:54:34 +00002078int
Damien Miller0bc1bd82000-11-13 22:57:25 +11002079channel_request_forwarding(
2080 const char *listen_address, u_short listen_port,
2081 const char *host_to_connect, u_short port_to_connect,
2082 int gateway_ports, int remote_fwd)
2083{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002084 Channel *c;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002085 int success, sock, on = 1, type;
Damien Miller34132e52000-01-14 15:45:46 +11002086 struct addrinfo hints, *ai, *aitop;
2087 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller0bc1bd82000-11-13 22:57:25 +11002088 const char *host;
Damien Miller5428f641999-11-25 11:54:57 +11002089 struct linger linger;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002090
Kevin Steves12057502001-02-05 14:54:34 +00002091 success = 0;
2092
Damien Miller0bc1bd82000-11-13 22:57:25 +11002093 if (remote_fwd) {
2094 host = listen_address;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002095 type = SSH_CHANNEL_RPORT_LISTENER;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002096 } else {
2097 host = host_to_connect;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002098 type = SSH_CHANNEL_PORT_LISTENER;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002099 }
2100
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002101 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002102 error("Forward host name too long.");
2103 return success;
2104 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002105
Damien Miller0bc1bd82000-11-13 22:57:25 +11002106 /* XXX listen_address is currently ignored */
Damien Miller5428f641999-11-25 11:54:57 +11002107 /*
Damien Miller34132e52000-01-14 15:45:46 +11002108 * getaddrinfo returns a loopback address if the hostname is
2109 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002110 */
Damien Miller34132e52000-01-14 15:45:46 +11002111 memset(&hints, 0, sizeof(hints));
2112 hints.ai_family = IPv4or6;
2113 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
2114 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002115 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002116 if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
2117 packet_disconnect("getaddrinfo: fatal error");
Damien Miller5428f641999-11-25 11:54:57 +11002118
Damien Miller34132e52000-01-14 15:45:46 +11002119 for (ai = aitop; ai; ai = ai->ai_next) {
2120 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2121 continue;
2122 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2123 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11002124 error("channel_request_forwarding: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002125 continue;
2126 }
2127 /* Create a port to listen for the host. */
2128 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2129 if (sock < 0) {
2130 /* this is no error since kernel may not support ipv6 */
2131 verbose("socket: %.100s", strerror(errno));
2132 continue;
2133 }
2134 /*
2135 * Set socket options. We would like the socket to disappear
2136 * as soon as it has been closed for whatever reason.
2137 */
2138 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
2139 linger.l_onoff = 1;
2140 linger.l_linger = 5;
2141 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
2142 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002143
Damien Miller34132e52000-01-14 15:45:46 +11002144 /* Bind the socket to the address. */
2145 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2146 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002147 if (!ai->ai_next)
2148 error("bind: %.100s", strerror(errno));
2149 else
2150 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002151
Damien Miller34132e52000-01-14 15:45:46 +11002152 close(sock);
2153 continue;
2154 }
2155 /* Start listening for connections on the socket. */
2156 if (listen(sock, 5) < 0) {
2157 error("listen: %.100s", strerror(errno));
2158 close(sock);
2159 continue;
2160 }
2161 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002162 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002163 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002164 0, xstrdup("port listener"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002165 if (c == NULL) {
2166 error("channel_request_forwarding: channel_new failed");
2167 close(sock);
2168 continue;
2169 }
2170 strlcpy(c->path, host, sizeof(c->path));
2171 c->host_port = port_to_connect;
2172 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002173 success = 1;
2174 }
2175 if (success == 0)
Kevin Steves12057502001-02-05 14:54:34 +00002176 error("channel_request_forwarding: cannot listen to port: %d",
2177 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002178 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002179 return success;
Damien Miller95def091999-11-25 00:26:21 +11002180}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002181
Damien Miller5428f641999-11-25 11:54:57 +11002182/*
2183 * Initiate forwarding of connections to port "port" on remote host through
2184 * the secure channel to host:port from local side.
2185 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002186
Damien Miller4af51302000-04-16 11:18:38 +10002187void
Damien Miller0bc1bd82000-11-13 22:57:25 +11002188channel_request_remote_forwarding(u_short listen_port,
2189 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002190{
Damien Miller0bc1bd82000-11-13 22:57:25 +11002191 int payload_len, type, success = 0;
2192
Damien Miller95def091999-11-25 00:26:21 +11002193 /* Record locally that connection to this host/port is permitted. */
2194 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2195 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002196
Damien Miller95def091999-11-25 00:26:21 +11002197 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002198 if (compat20) {
2199 const char *address_to_bind = "0.0.0.0";
2200 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2201 packet_put_cstring("tcpip-forward");
2202 packet_put_char(0); /* boolean: want reply */
2203 packet_put_cstring(address_to_bind);
2204 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002205 packet_send();
2206 packet_write_wait();
2207 /* Assume that server accepts the request */
2208 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002209 } else {
2210 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002211 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002212 packet_put_cstring(host_to_connect);
2213 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002214 packet_send();
2215 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002216
2217 /* Wait for response from the remote side. */
2218 type = packet_read(&payload_len);
2219 switch (type) {
2220 case SSH_SMSG_SUCCESS:
2221 success = 1;
2222 break;
2223 case SSH_SMSG_FAILURE:
2224 log("Warning: Server denied remote port forwarding.");
2225 break;
2226 default:
2227 /* Unknown packet */
2228 packet_disconnect("Protocol error for port forward request:"
2229 "received packet type %d.", type);
2230 }
2231 }
2232 if (success) {
2233 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2234 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2235 permitted_opens[num_permitted_opens].listen_port = listen_port;
2236 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002237 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002238}
2239
Damien Miller5428f641999-11-25 11:54:57 +11002240/*
2241 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2242 * listening for the port, and sends back a success reply (or disconnect
2243 * message if there was an error). This never returns if there was an error.
2244 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002245
Damien Miller4af51302000-04-16 11:18:38 +10002246void
Damien Millere247cc42000-05-07 12:03:14 +10002247channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002248{
Damien Milleraae6c611999-12-06 11:47:28 +11002249 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002250 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002251
Damien Miller95def091999-11-25 00:26:21 +11002252 /* Get arguments from the packet. */
2253 port = packet_get_int();
2254 hostname = packet_get_string(NULL);
2255 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002256
Damien Millerbac2d8a2000-09-05 16:13:06 +11002257#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002258 /*
2259 * Check that an unprivileged user is not trying to forward a
2260 * privileged port.
2261 */
Damien Miller95def091999-11-25 00:26:21 +11002262 if (port < IPPORT_RESERVED && !is_root)
2263 packet_disconnect("Requested forwarding of port %d but user is not root.",
2264 port);
Damien Millerbac2d8a2000-09-05 16:13:06 +11002265#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +11002266 /* Initiate forwarding */
Damien Millere247cc42000-05-07 12:03:14 +10002267 channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002268
2269 /* Free the argument string. */
2270 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002271}
2272
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002273/*
2274 * Permits opening to any host/port if permitted_opens[] is empty. This is
2275 * usually called by the server, because the user could connect to any port
2276 * anyway, and the server has no way to know but to trust the client anyway.
2277 */
2278void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002279channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002280{
2281 if (num_permitted_opens == 0)
2282 all_opens_permitted = 1;
2283}
2284
Ben Lindstroma3700052001-04-05 23:26:32 +00002285void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002286channel_add_permitted_opens(char *host, int port)
2287{
2288 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2289 fatal("channel_request_remote_forwarding: too many forwards");
2290 debug("allow port forwarding to host %s port %d", host, port);
2291
2292 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2293 permitted_opens[num_permitted_opens].port_to_connect = port;
2294 num_permitted_opens++;
2295
2296 all_opens_permitted = 0;
2297}
2298
Ben Lindstroma3700052001-04-05 23:26:32 +00002299void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002300channel_clear_permitted_opens(void)
2301{
2302 int i;
2303
2304 for (i = 0; i < num_permitted_opens; i++)
2305 xfree(permitted_opens[i].host_to_connect);
2306 num_permitted_opens = 0;
2307
2308}
2309
2310
2311/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002312static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002313connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002314{
Damien Miller34132e52000-01-14 15:45:46 +11002315 struct addrinfo hints, *ai, *aitop;
2316 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2317 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002318 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002319
Damien Miller34132e52000-01-14 15:45:46 +11002320 memset(&hints, 0, sizeof(hints));
2321 hints.ai_family = IPv4or6;
2322 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002323 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002324 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002325 error("connect_to %.100s: unknown host (%s)", host,
2326 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002327 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002328 }
Damien Miller34132e52000-01-14 15:45:46 +11002329 for (ai = aitop; ai; ai = ai->ai_next) {
2330 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2331 continue;
2332 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2333 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002334 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002335 continue;
2336 }
Damien Miller34132e52000-01-14 15:45:46 +11002337 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2338 if (sock < 0) {
2339 error("socket: %.100s", strerror(errno));
2340 continue;
2341 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +00002342 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002343 fatal("connect_to: F_SETFL: %s", strerror(errno));
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002344 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2345 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002346 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002347 strerror(errno));
2348 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002349 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002350 }
2351 break; /* success */
2352
2353 }
2354 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002355 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002356 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002357 return -1;
2358 }
2359 /* success */
2360 return sock;
2361}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002362
Damien Miller0bc1bd82000-11-13 22:57:25 +11002363int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002364channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002365{
2366 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002367
Damien Miller0bc1bd82000-11-13 22:57:25 +11002368 for (i = 0; i < num_permitted_opens; i++)
2369 if (permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002370 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002371 permitted_opens[i].host_to_connect,
2372 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002373 error("WARNING: Server requests forwarding for unknown listen_port %d",
2374 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002375 return -1;
2376}
Damien Millerb38eff82000-04-01 11:09:21 +10002377
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002378/* Check if connecting to that port is permitted and connect. */
2379int
2380channel_connect_to(const char *host, u_short port)
2381{
2382 int i, permit;
2383
2384 permit = all_opens_permitted;
2385 if (!permit) {
2386 for (i = 0; i < num_permitted_opens; i++)
2387 if (permitted_opens[i].port_to_connect == port &&
2388 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2389 permit = 1;
2390
2391 }
2392 if (!permit) {
2393 log("Received request to connect to host %.100s port %d, "
2394 "but the request was denied.", host, port);
2395 return -1;
2396 }
2397 return connect_to(host, port);
2398}
2399
Ben Lindstrome9c99912001-06-09 00:41:05 +00002400/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002401
Damien Miller5428f641999-11-25 11:54:57 +11002402/*
2403 * Creates an internet domain socket for listening for X11 connections.
Kevin Steves366298c2001-12-19 17:58:01 +00002404 * Returns a suitable display number for the DISPLAY variable, or -1 if
2405 * an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002406 */
Kevin Steves366298c2001-12-19 17:58:01 +00002407int
2408x11_create_display_inet(int x11_display_offset, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002409{
Damien Milleraae6c611999-12-06 11:47:28 +11002410 int display_number, sock;
2411 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002412 struct addrinfo hints, *ai, *aitop;
2413 char strport[NI_MAXSERV];
2414 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002415
Damien Millera34a28b1999-12-14 10:47:15 +11002416 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002417 display_number < MAX_DISPLAYS;
2418 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002419 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002420 memset(&hints, 0, sizeof(hints));
2421 hints.ai_family = IPv4or6;
Kevin Steves366298c2001-12-19 17:58:01 +00002422 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002423 hints.ai_socktype = SOCK_STREAM;
2424 snprintf(strport, sizeof strport, "%d", port);
2425 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2426 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002427 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002428 }
Damien Miller34132e52000-01-14 15:45:46 +11002429 for (ai = aitop; ai; ai = ai->ai_next) {
2430 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2431 continue;
2432 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2433 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002434 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002435 error("socket: %.100s", strerror(errno));
Kevin Steves366298c2001-12-19 17:58:01 +00002436 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002437 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002438 debug("x11_create_display_inet: Socket family %d not supported",
2439 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002440 continue;
2441 }
Damien Miller34132e52000-01-14 15:45:46 +11002442 }
2443 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2444 debug("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002445 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002446
2447 if (ai->ai_next)
2448 continue;
2449
Damien Miller34132e52000-01-14 15:45:46 +11002450 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002451 close(socks[n]);
2452 }
2453 num_socks = 0;
2454 break;
2455 }
2456 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002457#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002458 if (num_socks == NUM_SOCKS)
2459 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002460#else
2461 break;
2462#endif
Damien Miller95def091999-11-25 00:26:21 +11002463 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002464 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002465 if (num_socks > 0)
2466 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002467 }
Damien Miller95def091999-11-25 00:26:21 +11002468 if (display_number >= MAX_DISPLAYS) {
2469 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002470 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002471 }
Damien Miller95def091999-11-25 00:26:21 +11002472 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002473 for (n = 0; n < num_socks; n++) {
2474 sock = socks[n];
2475 if (listen(sock, 5) < 0) {
2476 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002477 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002478 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002479 }
Damien Miller95def091999-11-25 00:26:21 +11002480 }
Damien Miller34132e52000-01-14 15:45:46 +11002481
Damien Miller34132e52000-01-14 15:45:46 +11002482 /* Allocate a channel for each socket. */
2483 for (n = 0; n < num_socks; n++) {
2484 sock = socks[n];
Damien Millerbd483e72000-04-30 10:00:53 +10002485 (void) channel_new("x11 listener",
2486 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2487 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002488 0, xstrdup("X11 inet listener"), 1);
Damien Miller34132e52000-01-14 15:45:46 +11002489 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002490
Kevin Steves366298c2001-12-19 17:58:01 +00002491 /* Return the display number for the DISPLAY environment variable. */
2492 return display_number;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002493}
2494
Ben Lindstrombba81212001-06-25 05:01:22 +00002495static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002496connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002497{
Damien Miller95def091999-11-25 00:26:21 +11002498 int sock;
2499 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002500
Damien Miller3afe3752001-12-21 12:39:51 +11002501 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2502 if (sock < 0)
2503 error("socket: %.100s", strerror(errno));
2504 memset(&addr, 0, sizeof(addr));
2505 addr.sun_family = AF_UNIX;
2506 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
2507 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2508 return sock;
2509 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002510 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2511 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002512}
2513
Damien Millerbd483e72000-04-30 10:00:53 +10002514int
2515x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002516{
Ben Lindstrom73f57be2001-12-07 17:28:34 +00002517 int display_number, sock = 0, on = 1;
Damien Miller95def091999-11-25 00:26:21 +11002518 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002519 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002520 struct addrinfo hints, *ai, *aitop;
2521 char strport[NI_MAXSERV];
2522 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002523
Damien Miller95def091999-11-25 00:26:21 +11002524 /* Try to open a socket for the local X server. */
2525 display = getenv("DISPLAY");
2526 if (!display) {
2527 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002528 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002529 }
Damien Miller5428f641999-11-25 11:54:57 +11002530 /*
2531 * Now we decode the value of the DISPLAY variable and make a
2532 * connection to the real X server.
2533 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002534
Damien Miller5428f641999-11-25 11:54:57 +11002535 /*
2536 * Check if it is a unix domain socket. Unix domain displays are in
2537 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2538 */
Damien Miller95def091999-11-25 00:26:21 +11002539 if (strncmp(display, "unix:", 5) == 0 ||
2540 display[0] == ':') {
2541 /* Connect to the unix domain socket. */
2542 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2543 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002544 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002545 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002546 }
2547 /* Create a socket. */
2548 sock = connect_local_xsocket(display_number);
2549 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002550 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002551
2552 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002553 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002554 }
Damien Miller5428f641999-11-25 11:54:57 +11002555 /*
2556 * Connect to an inet socket. The DISPLAY value is supposedly
2557 * hostname:d[.s], where hostname may also be numeric IP address.
2558 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002559 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002560 cp = strchr(buf, ':');
2561 if (!cp) {
2562 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002563 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002564 }
Damien Miller95def091999-11-25 00:26:21 +11002565 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002566 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002567 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2568 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002569 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002570 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002571 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002572
Damien Miller34132e52000-01-14 15:45:46 +11002573 /* Look up the host address */
2574 memset(&hints, 0, sizeof(hints));
2575 hints.ai_family = IPv4or6;
2576 hints.ai_socktype = SOCK_STREAM;
2577 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2578 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2579 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002580 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002581 }
Damien Miller34132e52000-01-14 15:45:46 +11002582 for (ai = aitop; ai; ai = ai->ai_next) {
2583 /* Create a socket. */
2584 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2585 if (sock < 0) {
2586 debug("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002587 continue;
2588 }
2589 /* Connect it to the display. */
2590 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2591 debug("connect %.100s port %d: %.100s", buf,
2592 6000 + display_number, strerror(errno));
2593 close(sock);
2594 continue;
2595 }
2596 /* Success */
2597 break;
Damien Miller34132e52000-01-14 15:45:46 +11002598 }
Damien Miller34132e52000-01-14 15:45:46 +11002599 freeaddrinfo(aitop);
2600 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002601 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002602 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002603 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002604 }
Ben Lindstrom73f57be2001-12-07 17:28:34 +00002605 if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on) == -1)
2606 error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002607 return sock;
2608}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002609
Damien Millerbd483e72000-04-30 10:00:53 +10002610/*
2611 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2612 * the remote channel number. We should do whatever we want, and respond
2613 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2614 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002615
Damien Millerbd483e72000-04-30 10:00:53 +10002616void
Damien Miller62cee002000-09-23 17:15:56 +11002617x11_input_open(int type, int plen, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002618{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002619 Channel *c = NULL;
2620 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002621 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002622
2623 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002624
2625 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002626
2627 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002628 remote_host = packet_get_string(NULL);
2629 } else {
2630 remote_host = xstrdup("unknown (remote did not supply name)");
2631 }
2632 packet_done();
Damien Millerbd483e72000-04-30 10:00:53 +10002633
2634 /* Obtain a connection to the real X display. */
2635 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002636 if (sock != -1) {
2637 /* Allocate a channel for this connection. */
2638 c = channel_new("connected x11 socket",
2639 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2640 remote_host, 1);
2641 if (c == NULL) {
2642 error("x11_input_open: channel_new failed");
2643 close(sock);
2644 } else {
2645 c->remote_id = remote_id;
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002646 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002647 }
2648 }
2649 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002650 /* Send refusal to the remote host. */
2651 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002652 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10002653 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10002654 /* Send a confirmation to the remote host. */
2655 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002656 packet_put_int(remote_id);
2657 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10002658 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002659 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002660}
2661
Damien Miller69b69aa2000-10-28 14:19:58 +11002662/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2663void
2664deny_input_open(int type, int plen, void *ctxt)
2665{
2666 int rchan = packet_get_int();
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002667 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11002668 case SSH_SMSG_AGENT_OPEN:
2669 error("Warning: ssh server tried agent forwarding.");
2670 break;
2671 case SSH_SMSG_X11_OPEN:
2672 error("Warning: ssh server tried X11 forwarding.");
2673 break;
2674 default:
2675 error("deny_input_open: type %d plen %d", type, plen);
2676 break;
2677 }
2678 error("Warning: this is probably a break in attempt by a malicious server.");
2679 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2680 packet_put_int(rchan);
2681 packet_send();
2682}
2683
Damien Miller5428f641999-11-25 11:54:57 +11002684/*
2685 * Requests forwarding of X11 connections, generates fake authentication
2686 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00002687 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11002688 */
Damien Miller4af51302000-04-16 11:18:38 +10002689void
Damien Millerbd483e72000-04-30 10:00:53 +10002690x11_request_forwarding_with_spoofing(int client_session_id,
2691 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002692{
Ben Lindstrom46c16222000-12-22 01:43:59 +00002693 u_int data_len = (u_int) strlen(data) / 2;
Ben Lindstromb3211a82001-02-10 22:33:19 +00002694 u_int i, value, len;
Damien Miller95def091999-11-25 00:26:21 +11002695 char *new_data;
2696 int screen_number;
2697 const char *cp;
2698 u_int32_t rand = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002699
Damien Miller95def091999-11-25 00:26:21 +11002700 cp = getenv("DISPLAY");
2701 if (cp)
2702 cp = strchr(cp, ':');
2703 if (cp)
2704 cp = strchr(cp, '.');
2705 if (cp)
2706 screen_number = atoi(cp + 1);
2707 else
2708 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002709
Damien Miller95def091999-11-25 00:26:21 +11002710 /* Save protocol name. */
2711 x11_saved_proto = xstrdup(proto);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002712
Damien Miller5428f641999-11-25 11:54:57 +11002713 /*
2714 * Extract real authentication data and generate fake data of the
2715 * same length.
2716 */
Damien Miller95def091999-11-25 00:26:21 +11002717 x11_saved_data = xmalloc(data_len);
2718 x11_fake_data = xmalloc(data_len);
2719 for (i = 0; i < data_len; i++) {
2720 if (sscanf(data + 2 * i, "%2x", &value) != 1)
2721 fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2722 if (i % 4 == 0)
2723 rand = arc4random();
2724 x11_saved_data[i] = value;
2725 x11_fake_data[i] = rand & 0xff;
2726 rand >>= 8;
2727 }
2728 x11_saved_data_len = data_len;
2729 x11_fake_data_len = data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002730
Damien Miller95def091999-11-25 00:26:21 +11002731 /* Convert the fake data into hex. */
Ben Lindstromb3211a82001-02-10 22:33:19 +00002732 len = 2 * data_len + 1;
2733 new_data = xmalloc(len);
Damien Miller95def091999-11-25 00:26:21 +11002734 for (i = 0; i < data_len; i++)
Ben Lindstromb3211a82001-02-10 22:33:19 +00002735 snprintf(new_data + 2 * i, len - 2 * i,
2736 "%02x", (u_char) x11_fake_data[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002737
Damien Miller95def091999-11-25 00:26:21 +11002738 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10002739 if (compat20) {
2740 channel_request_start(client_session_id, "x11-req", 0);
2741 packet_put_char(0); /* XXX bool single connection */
2742 } else {
2743 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2744 }
2745 packet_put_cstring(proto);
2746 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11002747 packet_put_int(screen_number);
2748 packet_send();
2749 packet_write_wait();
2750 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002751}
2752
Ben Lindstrome9c99912001-06-09 00:41:05 +00002753
2754/* -- agent forwarding */
2755
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002756/* Sends a message to the server to request authentication fd forwarding. */
2757
Damien Miller4af51302000-04-16 11:18:38 +10002758void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002759auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002760{
Damien Miller95def091999-11-25 00:26:21 +11002761 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2762 packet_send();
2763 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002764}
2765
Damien Miller5428f641999-11-25 11:54:57 +11002766/*
2767 * Returns the name of the forwarded authentication socket. Returns NULL if
2768 * there is no forwarded authentication socket. The returned value points to
2769 * a static buffer.
2770 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002771
Damien Miller95def091999-11-25 00:26:21 +11002772char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002773auth_get_socket_name(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002774{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002775 return auth_sock_name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002776}
2777
2778/* removes the agent forwarding socket */
2779
Damien Miller4af51302000-04-16 11:18:38 +10002780void
Ben Lindstrom983c0982001-06-09 01:20:06 +00002781auth_sock_cleanup_proc(void *_pw)
Damien Miller95def091999-11-25 00:26:21 +11002782{
Ben Lindstrom983c0982001-06-09 01:20:06 +00002783 struct passwd *pw = _pw;
2784
Ben Lindstrom838394c2001-06-09 01:11:59 +00002785 if (auth_sock_name) {
Ben Lindstrom983c0982001-06-09 01:20:06 +00002786 temporarily_use_uid(pw);
Ben Lindstrom838394c2001-06-09 01:11:59 +00002787 unlink(auth_sock_name);
2788 rmdir(auth_sock_dir);
2789 auth_sock_name = NULL;
Ben Lindstrom983c0982001-06-09 01:20:06 +00002790 restore_uid();
Ben Lindstrom838394c2001-06-09 01:11:59 +00002791 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002792}
2793
Damien Miller5428f641999-11-25 11:54:57 +11002794/*
Damien Millerd3a18572000-06-07 19:55:44 +10002795 * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
Damien Miller5428f641999-11-25 11:54:57 +11002796 * This starts forwarding authentication requests.
2797 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002798
Damien Millerd3a18572000-06-07 19:55:44 +10002799int
Damien Miller95def091999-11-25 00:26:21 +11002800auth_input_request_forwarding(struct passwd * pw)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002801{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002802 Channel *nc;
2803 int sock;
Damien Miller95def091999-11-25 00:26:21 +11002804 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002805
Ben Lindstrome9c99912001-06-09 00:41:05 +00002806 if (auth_get_socket_name() != NULL) {
2807 error("authentication forwarding requested twice.");
2808 return 0;
2809 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002810
Damien Miller95def091999-11-25 00:26:21 +11002811 /* Temporarily drop privileged uid for mkdir/bind. */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +00002812 temporarily_use_uid(pw);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002813
Damien Miller95def091999-11-25 00:26:21 +11002814 /* Allocate a buffer for the socket name, and format the name. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002815 auth_sock_name = xmalloc(MAXPATHLEN);
2816 auth_sock_dir = xmalloc(MAXPATHLEN);
2817 strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002818
Damien Miller95def091999-11-25 00:26:21 +11002819 /* Create private directory for socket */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002820 if (mkdtemp(auth_sock_dir) == NULL) {
2821 packet_send_debug("Agent forwarding disabled: "
2822 "mkdtemp() failed: %.100s", strerror(errno));
Damien Millerd3a18572000-06-07 19:55:44 +10002823 restore_uid();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002824 xfree(auth_sock_name);
2825 xfree(auth_sock_dir);
2826 auth_sock_name = NULL;
2827 auth_sock_dir = NULL;
Damien Millerd3a18572000-06-07 19:55:44 +10002828 return 0;
2829 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002830 snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d",
2831 auth_sock_dir, (int) getpid());
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002832
Ben Lindstrom838394c2001-06-09 01:11:59 +00002833 /* delete agent socket on fatal() */
Ben Lindstrom983c0982001-06-09 01:20:06 +00002834 fatal_add_cleanup(auth_sock_cleanup_proc, pw);
Ben Lindstrom838394c2001-06-09 01:11:59 +00002835
Damien Miller95def091999-11-25 00:26:21 +11002836 /* Create the socket. */
2837 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2838 if (sock < 0)
2839 packet_disconnect("socket: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002840
Damien Miller95def091999-11-25 00:26:21 +11002841 /* Bind it to the name. */
2842 memset(&sunaddr, 0, sizeof(sunaddr));
2843 sunaddr.sun_family = AF_UNIX;
Ben Lindstromccd8d072001-12-07 17:26:48 +00002844 strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002845
Damien Miller95def091999-11-25 00:26:21 +11002846 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
2847 packet_disconnect("bind: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002848
Damien Miller95def091999-11-25 00:26:21 +11002849 /* Restore the privileged uid. */
2850 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002851
Damien Miller95def091999-11-25 00:26:21 +11002852 /* Start listening on the socket. */
2853 if (listen(sock, 5) < 0)
2854 packet_disconnect("listen: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002855
Damien Miller95def091999-11-25 00:26:21 +11002856 /* Allocate a channel for the authentication agent socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002857 nc = channel_new("auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11002858 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
2859 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
2860 0, xstrdup("auth socket"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002861 if (nc == NULL) {
2862 error("auth_input_request_forwarding: channel_new failed");
Ben Lindstrom983c0982001-06-09 01:20:06 +00002863 auth_sock_cleanup_proc(pw);
Ben Lindstromdf4981b2001-06-09 01:32:29 +00002864 fatal_remove_cleanup(auth_sock_cleanup_proc, pw);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002865 close(sock);
2866 return 0;
2867 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002868 strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
Damien Millerd3a18572000-06-07 19:55:44 +10002869 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002870}
2871
2872/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2873
Damien Miller4af51302000-04-16 11:18:38 +10002874void
Damien Miller62cee002000-09-23 17:15:56 +11002875auth_input_open_request(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002876{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002877 Channel *c = NULL;
2878 int remote_id, sock;
Ben Lindstrome9c99912001-06-09 00:41:05 +00002879 char *name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002880
Damien Millerb38eff82000-04-01 11:09:21 +10002881 packet_integrity_check(plen, 4, type);
2882
Damien Miller95def091999-11-25 00:26:21 +11002883 /* Read the remote channel number from the message. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002884 remote_id = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002885
Damien Miller5428f641999-11-25 11:54:57 +11002886 /*
2887 * Get a connection to the local authentication agent (this may again
2888 * get forwarded).
2889 */
Damien Miller95def091999-11-25 00:26:21 +11002890 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002891
Damien Miller5428f641999-11-25 11:54:57 +11002892 /*
2893 * If we could not connect the agent, send an error message back to
2894 * the server. This should never happen unless the agent dies,
2895 * because authentication forwarding is only enabled if we have an
2896 * agent.
2897 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002898 if (sock >= 0) {
Ben Lindstrome9c99912001-06-09 00:41:05 +00002899 name = xstrdup("authentication agent connection");
2900 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
2901 -1, 0, 0, 0, name, 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002902 if (c == NULL) {
2903 error("auth_input_open_request: channel_new failed");
Ben Lindstrome9c99912001-06-09 00:41:05 +00002904 xfree(name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002905 close(sock);
2906 } else {
2907 c->remote_id = remote_id;
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002908 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002909 }
Damien Miller95def091999-11-25 00:26:21 +11002910 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002911 if (c == NULL) {
2912 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2913 packet_put_int(remote_id);
2914 } else {
2915 /* Send a confirmation to the remote host. */
2916 debug("Forwarding authentication connection.");
2917 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2918 packet_put_int(remote_id);
2919 packet_put_int(c->self);
2920 }
Damien Miller95def091999-11-25 00:26:21 +11002921 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002922}