blob: 239da8e9b9d9d4891820bd9c7a9f9246751469af [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * This file contains functions for generic socket connection forwarding.
6 * There is also code for initiating connection forwarding for X11 connections,
7 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10008 *
Damien Millere4340be2000-09-16 13:29:08 +11009 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose. Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
14 *
Damien Miller33b13562000-04-04 14:38:59 +100015 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110016 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110017 * Copyright (c) 1999 Dug Song. All rights reserved.
18 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
32 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
33 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110039 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110042
43#include <sys/ioctl.h>
Damien Miller574c41f2006-03-15 11:40:10 +110044#include <sys/types.h>
45#include <sys/un.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110046
47#include <termios.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100048
49#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000050#include "ssh1.h"
51#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100052#include "packet.h"
53#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000054#include "log.h"
55#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100056#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100057#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000058#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100059#include "key.h"
60#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110061#include "pathnames.h"
Darren Tucker46471c92003-07-03 13:55:19 +100062#include "bufaux.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100063
Ben Lindstrome9c99912001-06-09 00:41:05 +000064/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100065
Damien Miller5428f641999-11-25 11:54:57 +110066/*
67 * Pointer to an array containing all allocated channels. The array is
68 * dynamically extended as needed.
69 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000070static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100071
Damien Miller5428f641999-11-25 11:54:57 +110072/*
73 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000074 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110075 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100076static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100077
Damien Miller5428f641999-11-25 11:54:57 +110078/*
79 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000080 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110081 */
Damien Miller5e953212001-01-30 09:14:00 +110082static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100083
Damien Millerd4a8b7e1999-10-27 13:42:43 +100084
Ben Lindstrome9c99912001-06-09 00:41:05 +000085/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086
Damien Miller5428f641999-11-25 11:54:57 +110087/*
88 * Data structure for storing which hosts are permitted for forward requests.
89 * The local sides of any remote forwards are stored in this array to prevent
90 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
91 * network (which might be behind a firewall).
92 */
Damien Miller95def091999-11-25 00:26:21 +110093typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +100094 char *host_to_connect; /* Connect to 'host'. */
95 u_short port_to_connect; /* Connect to 'port'. */
96 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100097} ForwardPermission;
98
99/* List of all permitted host/port pairs to connect. */
100static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +0000101
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000102/* Number of permitted host/port pairs in the array. */
103static int num_permitted_opens = 0;
Damien Miller5428f641999-11-25 11:54:57 +1100104/*
105 * If this is true, all opens are permitted. This is the case on the server
106 * on which we have to trust the client anyway, and the user could do
107 * anything after logging in anyway.
108 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000109static int all_opens_permitted = 0;
110
Ben Lindstrome9c99912001-06-09 00:41:05 +0000111
112/* -- X11 forwarding */
113
114/* Maximum number of fake X11 displays to try. */
115#define MAX_DISPLAYS 1000
116
Damien Miller13390022005-07-06 09:44:19 +1000117/* Saved X11 local (client) display. */
118static char *x11_saved_display = NULL;
119
Ben Lindstrome9c99912001-06-09 00:41:05 +0000120/* Saved X11 authentication protocol name. */
121static char *x11_saved_proto = NULL;
122
123/* Saved X11 authentication data. This is the real data. */
124static char *x11_saved_data = NULL;
125static u_int x11_saved_data_len = 0;
126
127/*
128 * Fake X11 authentication data. This is what the server will be sending us;
129 * we should replace any occurrences of this by the real data.
130 */
Damien Miller4ae97f12006-03-26 14:08:10 +1100131static u_char *x11_fake_data = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000132static u_int x11_fake_data_len;
133
134
135/* -- agent forwarding */
136
137#define NUM_SOCKS 10
138
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000139/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000140static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000141
Ben Lindstrome9c99912001-06-09 00:41:05 +0000142/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000143static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000144
Ben Lindstrome9c99912001-06-09 00:41:05 +0000145/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000146
147Channel *
Damien Millerd47c62a2005-12-13 19:33:57 +1100148channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000149{
150 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000151
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000152 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100153 logit("channel_by_id: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000154 return NULL;
155 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000156 c = channels[id];
157 if (c == NULL) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100158 logit("channel_by_id: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000159 return NULL;
160 }
161 return c;
162}
163
Damien Miller5428f641999-11-25 11:54:57 +1100164/*
Damien Millerd47c62a2005-12-13 19:33:57 +1100165 * Returns the channel if it is allowed to receive protocol messages.
166 * Private channels, like listening sockets, may not receive messages.
167 */
168Channel *
169channel_lookup(int id)
170{
171 Channel *c;
172
173 if ((c = channel_by_id(id)) == NULL)
174 return (NULL);
175
Damien Millerd62f2ca2006-03-26 13:57:41 +1100176 switch (c->type) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100177 case SSH_CHANNEL_X11_OPEN:
178 case SSH_CHANNEL_LARVAL:
179 case SSH_CHANNEL_CONNECTING:
180 case SSH_CHANNEL_DYNAMIC:
181 case SSH_CHANNEL_OPENING:
182 case SSH_CHANNEL_OPEN:
183 case SSH_CHANNEL_INPUT_DRAINING:
184 case SSH_CHANNEL_OUTPUT_DRAINING:
185 return (c);
Damien Millerd47c62a2005-12-13 19:33:57 +1100186 }
187 logit("Non-public channel %d, type %d.", id, c->type);
188 return (NULL);
189}
190
191/*
Damien Millere247cc42000-05-07 12:03:14 +1000192 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000193 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100194 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195
Ben Lindstrombba81212001-06-25 05:01:22 +0000196static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100197channel_register_fds(Channel *c, int rfd, int wfd, int efd,
198 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000199{
Damien Miller95def091999-11-25 00:26:21 +1100200 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100201 channel_max_fd = MAX(channel_max_fd, rfd);
202 channel_max_fd = MAX(channel_max_fd, wfd);
203 channel_max_fd = MAX(channel_max_fd, efd);
204
Damien Miller5428f641999-11-25 11:54:57 +1100205 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000206
Damien Miller6f83b8e2000-05-02 09:23:45 +1000207 c->rfd = rfd;
208 c->wfd = wfd;
209 c->sock = (rfd == wfd) ? rfd : -1;
Damien Miller0e220db2004-06-15 10:34:08 +1000210 c->ctl_fd = -1; /* XXX: set elsewhere */
Damien Miller6f83b8e2000-05-02 09:23:45 +1000211 c->efd = efd;
212 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100213
Damien Miller79438cc2001-02-16 12:34:57 +1100214 /* XXX ugly hack: nonblock is only set by the server */
215 if (nonblock && isatty(c->rfd)) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000216 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100217 c->isatty = 1;
218 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000219 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100220 c->self, c->wfd);
221 }
222 } else {
223 c->isatty = 0;
224 }
Ben Lindstrombeb5f332002-07-22 15:28:53 +0000225 c->wfd_isatty = isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100226
Damien Miller69b69aa2000-10-28 14:19:58 +1100227 /* enable nonblocking mode */
228 if (nonblock) {
229 if (rfd != -1)
230 set_nonblock(rfd);
231 if (wfd != -1)
232 set_nonblock(wfd);
233 if (efd != -1)
234 set_nonblock(efd);
235 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000236}
237
238/*
239 * Allocate a new channel object and set its type and socket. This will cause
240 * remote_name to be freed.
241 */
242
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000243Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000244channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000245 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000246{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000247 int found;
248 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000249 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000250
Damien Miller95def091999-11-25 00:26:21 +1100251 /* Do initial allocation if this is the first call. */
252 if (channels_alloc == 0) {
253 channels_alloc = 10;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000254 channels = xmalloc(channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100255 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000256 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100257 }
258 /* Try to find a free slot where to put the new channel. */
259 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000260 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100261 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000262 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100263 break;
264 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000265 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100266 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100267 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000268 if (channels_alloc > 10000)
269 fatal("channel_new: internal error: channels_alloc %d "
270 "too big.", channels_alloc);
Damien Miller5efcecc2003-09-17 07:31:14 +1000271 channels = xrealloc(channels,
272 (channels_alloc + 10) * sizeof(Channel *));
273 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100274 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100275 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000276 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100277 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000278 /* Initialize and return new channel. */
279 c = channels[found] = xmalloc(sizeof(Channel));
Damien Miller4623a752001-10-10 15:03:58 +1000280 memset(c, 0, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100281 buffer_init(&c->input);
282 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000283 buffer_init(&c->extended);
Damien Miller5144df92002-01-22 23:28:45 +1100284 c->ostate = CHAN_OUTPUT_OPEN;
285 c->istate = CHAN_INPUT_OPEN;
286 c->flags = 0;
Damien Miller69b69aa2000-10-28 14:19:58 +1100287 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100288 c->self = found;
289 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000290 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000291 c->local_window = window;
292 c->local_window_max = window;
293 c->local_consumed = 0;
294 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100295 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000296 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000297 c->remote_window = 0;
298 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000299 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100300 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000301 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100302 c->detach_close = 0;
Damien Miller67f0bc02002-02-05 12:23:08 +1100303 c->confirm = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +1000304 c->confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000305 c->input_filter = NULL;
Damien Miller077b2382005-12-31 16:22:32 +1100306 c->output_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100307 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000308 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000309}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000310
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000311static int
312channel_find_maxfd(void)
313{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000314 u_int i;
315 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000316 Channel *c;
317
318 for (i = 0; i < channels_alloc; i++) {
319 c = channels[i];
320 if (c != NULL) {
321 max = MAX(max, c->rfd);
322 max = MAX(max, c->wfd);
323 max = MAX(max, c->efd);
324 }
325 }
326 return max;
327}
328
329int
330channel_close_fd(int *fdp)
331{
332 int ret = 0, fd = *fdp;
333
334 if (fd != -1) {
335 ret = close(fd);
336 *fdp = -1;
337 if (fd == channel_max_fd)
338 channel_max_fd = channel_find_maxfd();
339 }
340 return ret;
341}
342
Damien Miller6f83b8e2000-05-02 09:23:45 +1000343/* Close all channel fd/socket. */
344
Ben Lindstrombba81212001-06-25 05:01:22 +0000345static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000346channel_close_fds(Channel *c)
347{
Damien Miller0e220db2004-06-15 10:34:08 +1000348 debug3("channel %d: close_fds r %d w %d e %d c %d",
349 c->self, c->rfd, c->wfd, c->efd, c->ctl_fd);
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000350
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000351 channel_close_fd(&c->sock);
Damien Miller0e220db2004-06-15 10:34:08 +1000352 channel_close_fd(&c->ctl_fd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000353 channel_close_fd(&c->rfd);
354 channel_close_fd(&c->wfd);
355 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000356}
357
358/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000359
Damien Miller4af51302000-04-16 11:18:38 +1000360void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000361channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000362{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000363 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000364 u_int i, n;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000365
366 for (n = 0, i = 0; i < channels_alloc; i++)
367 if (channels[i])
368 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000369 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000370 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000371
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000372 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000373 debug3("channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000374 xfree(s);
375
Damien Miller6f83b8e2000-05-02 09:23:45 +1000376 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000377 shutdown(c->sock, SHUT_RDWR);
Damien Miller0e220db2004-06-15 10:34:08 +1000378 if (c->ctl_fd != -1)
379 shutdown(c->ctl_fd, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000380 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000381 buffer_free(&c->input);
382 buffer_free(&c->output);
383 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000384 if (c->remote_name) {
385 xfree(c->remote_name);
386 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100387 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000388 channels[c->self] = NULL;
389 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000390}
391
Ben Lindstrome9c99912001-06-09 00:41:05 +0000392void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000393channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000394{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000395 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000396
Ben Lindstrom601e4362001-06-21 03:19:23 +0000397 for (i = 0; i < channels_alloc; i++)
398 if (channels[i] != NULL)
399 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000400}
401
402/*
403 * Closes the sockets/fds of all channels. This is used to close extra file
404 * descriptors after a fork.
405 */
406
407void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000408channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000409{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000410 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000411
412 for (i = 0; i < channels_alloc; i++)
413 if (channels[i] != NULL)
414 channel_close_fds(channels[i]);
415}
416
417/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000418 * Stop listening to channels.
419 */
420
421void
422channel_stop_listening(void)
423{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000424 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000425 Channel *c;
426
427 for (i = 0; i < channels_alloc; i++) {
428 c = channels[i];
429 if (c != NULL) {
430 switch (c->type) {
431 case SSH_CHANNEL_AUTH_SOCKET:
432 case SSH_CHANNEL_PORT_LISTENER:
433 case SSH_CHANNEL_RPORT_LISTENER:
434 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000435 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000436 channel_free(c);
437 break;
438 }
439 }
440 }
441}
442
443/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000444 * Returns true if no channel has too much buffered data, and false if one or
445 * more channel is overfull.
446 */
447
448int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000449channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000450{
451 u_int i;
452 Channel *c;
453
454 for (i = 0; i < channels_alloc; i++) {
455 c = channels[i];
456 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000457#if 0
458 if (!compat20 &&
459 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100460 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000461 c->self, buffer_len(&c->input));
462 return 0;
463 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000464#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000465 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000466 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000467 c->self, buffer_len(&c->output),
468 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000469 return 0;
470 }
471 }
472 }
473 return 1;
474}
475
476/* Returns true if any channel is still open. */
477
478int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000479channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000480{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000481 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000482 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_X11_LISTENER:
490 case SSH_CHANNEL_PORT_LISTENER:
491 case SSH_CHANNEL_RPORT_LISTENER:
492 case SSH_CHANNEL_CLOSED:
493 case SSH_CHANNEL_AUTH_SOCKET:
494 case SSH_CHANNEL_DYNAMIC:
495 case SSH_CHANNEL_CONNECTING:
496 case SSH_CHANNEL_ZOMBIE:
497 continue;
498 case SSH_CHANNEL_LARVAL:
499 if (!compat20)
500 fatal("cannot happen: SSH_CHANNEL_LARVAL");
501 continue;
502 case SSH_CHANNEL_OPENING:
503 case SSH_CHANNEL_OPEN:
504 case SSH_CHANNEL_X11_OPEN:
505 return 1;
506 case SSH_CHANNEL_INPUT_DRAINING:
507 case SSH_CHANNEL_OUTPUT_DRAINING:
508 if (!compat13)
509 fatal("cannot happen: OUT_DRAIN");
510 return 1;
511 default:
512 fatal("channel_still_open: bad channel type %d", c->type);
513 /* NOTREACHED */
514 }
515 }
516 return 0;
517}
518
519/* Returns the id of an open channel suitable for keepaliving */
520
521int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000522channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000523{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000524 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000525 Channel *c;
526
527 for (i = 0; i < channels_alloc; i++) {
528 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000529 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000530 continue;
531 switch (c->type) {
532 case SSH_CHANNEL_CLOSED:
533 case SSH_CHANNEL_DYNAMIC:
534 case SSH_CHANNEL_X11_LISTENER:
535 case SSH_CHANNEL_PORT_LISTENER:
536 case SSH_CHANNEL_RPORT_LISTENER:
537 case SSH_CHANNEL_OPENING:
538 case SSH_CHANNEL_CONNECTING:
539 case SSH_CHANNEL_ZOMBIE:
540 continue;
541 case SSH_CHANNEL_LARVAL:
542 case SSH_CHANNEL_AUTH_SOCKET:
543 case SSH_CHANNEL_OPEN:
544 case SSH_CHANNEL_X11_OPEN:
545 return i;
546 case SSH_CHANNEL_INPUT_DRAINING:
547 case SSH_CHANNEL_OUTPUT_DRAINING:
548 if (!compat13)
549 fatal("cannot happen: OUT_DRAIN");
550 return i;
551 default:
552 fatal("channel_find_open: bad channel type %d", c->type);
553 /* NOTREACHED */
554 }
555 }
556 return -1;
557}
558
559
560/*
561 * Returns a message describing the currently open forwarded connections,
562 * suitable for sending to the client. The message contains crlf pairs for
563 * newlines.
564 */
565
566char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000567channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000568{
569 Buffer buffer;
570 Channel *c;
571 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000572 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000573
574 buffer_init(&buffer);
575 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
576 buffer_append(&buffer, buf, strlen(buf));
577 for (i = 0; i < channels_alloc; i++) {
578 c = channels[i];
579 if (c == NULL)
580 continue;
581 switch (c->type) {
582 case SSH_CHANNEL_X11_LISTENER:
583 case SSH_CHANNEL_PORT_LISTENER:
584 case SSH_CHANNEL_RPORT_LISTENER:
585 case SSH_CHANNEL_CLOSED:
586 case SSH_CHANNEL_AUTH_SOCKET:
587 case SSH_CHANNEL_ZOMBIE:
588 continue;
589 case SSH_CHANNEL_LARVAL:
590 case SSH_CHANNEL_OPENING:
591 case SSH_CHANNEL_CONNECTING:
592 case SSH_CHANNEL_DYNAMIC:
593 case SSH_CHANNEL_OPEN:
594 case SSH_CHANNEL_X11_OPEN:
595 case SSH_CHANNEL_INPUT_DRAINING:
596 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000597 snprintf(buf, sizeof buf,
598 " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000599 c->self, c->remote_name,
600 c->type, c->remote_id,
601 c->istate, buffer_len(&c->input),
602 c->ostate, buffer_len(&c->output),
Damien Miller0e220db2004-06-15 10:34:08 +1000603 c->rfd, c->wfd, c->ctl_fd);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000604 buffer_append(&buffer, buf, strlen(buf));
605 continue;
606 default:
607 fatal("channel_open_message: bad channel type %d", c->type);
608 /* NOTREACHED */
609 }
610 }
611 buffer_append(&buffer, "\0", 1);
612 cp = xstrdup(buffer_ptr(&buffer));
613 buffer_free(&buffer);
614 return cp;
615}
616
617void
618channel_send_open(int id)
619{
620 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000621
Ben Lindstrome9c99912001-06-09 00:41:05 +0000622 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000623 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000624 return;
625 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000626 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000627 packet_start(SSH2_MSG_CHANNEL_OPEN);
628 packet_put_cstring(c->ctype);
629 packet_put_int(c->self);
630 packet_put_int(c->local_window);
631 packet_put_int(c->local_maxpacket);
632 packet_send();
633}
634
635void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000636channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000637{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000638 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000639
Ben Lindstrome9c99912001-06-09 00:41:05 +0000640 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000641 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000642 return;
643 }
Damien Miller0e220db2004-06-15 10:34:08 +1000644 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000645 packet_start(SSH2_MSG_CHANNEL_REQUEST);
646 packet_put_int(c->remote_id);
647 packet_put_cstring(service);
648 packet_put_char(wantconfirm);
649}
650void
Damien Miller0e220db2004-06-15 10:34:08 +1000651channel_register_confirm(int id, channel_callback_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000652{
653 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000654
Ben Lindstrome9c99912001-06-09 00:41:05 +0000655 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000656 logit("channel_register_comfirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000657 return;
658 }
Damien Miller67f0bc02002-02-05 12:23:08 +1100659 c->confirm = fn;
Damien Miller0e220db2004-06-15 10:34:08 +1000660 c->confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000661}
662void
Damien Miller39eda6e2005-11-05 14:52:50 +1100663channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000664{
Damien Millerd47c62a2005-12-13 19:33:57 +1100665 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000666
Ben Lindstrome9c99912001-06-09 00:41:05 +0000667 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000668 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000669 return;
670 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000671 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100672 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000673}
674void
675channel_cancel_cleanup(int id)
676{
Damien Millerd47c62a2005-12-13 19:33:57 +1100677 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000678
Ben Lindstrome9c99912001-06-09 00:41:05 +0000679 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000680 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000681 return;
682 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000683 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100684 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000685}
686void
Damien Miller077b2382005-12-31 16:22:32 +1100687channel_register_filter(int id, channel_infilter_fn *ifn,
688 channel_outfilter_fn *ofn)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000689{
690 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000691
Ben Lindstrome9c99912001-06-09 00:41:05 +0000692 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000693 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000694 return;
695 }
Damien Miller077b2382005-12-31 16:22:32 +1100696 c->input_filter = ifn;
697 c->output_filter = ofn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000698}
699
700void
701channel_set_fds(int id, int rfd, int wfd, int efd,
Damien Miller2aa0c192002-02-19 15:20:08 +1100702 int extusage, int nonblock, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000703{
704 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000705
Ben Lindstrome9c99912001-06-09 00:41:05 +0000706 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
707 fatal("channel_activate for non-larval channel %d.", id);
708 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
709 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100710 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000711 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
712 packet_put_int(c->remote_id);
713 packet_put_int(c->local_window);
714 packet_send();
715}
716
Damien Miller5428f641999-11-25 11:54:57 +1100717/*
Damien Millerb38eff82000-04-01 11:09:21 +1000718 * 'channel_pre*' are called just before select() to add any bits relevant to
719 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100720 */
Damien Millerb38eff82000-04-01 11:09:21 +1000721/*
722 * 'channel_post*': perform any appropriate operations for channels which
723 * have events pending.
724 */
Damien Millerd62f2ca2006-03-26 13:57:41 +1100725typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000726chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
727chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
728
Ben Lindstrombba81212001-06-25 05:01:22 +0000729static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100730channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000731{
732 FD_SET(c->sock, readset);
733}
734
Ben Lindstrombba81212001-06-25 05:01:22 +0000735static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100736channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000737{
738 debug3("channel %d: waiting for connection", c->self);
739 FD_SET(c->sock, writeset);
740}
741
Ben Lindstrombba81212001-06-25 05:01:22 +0000742static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100743channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000744{
745 if (buffer_len(&c->input) < packet_get_maxsize())
746 FD_SET(c->sock, readset);
747 if (buffer_len(&c->output) > 0)
748 FD_SET(c->sock, writeset);
749}
750
Ben Lindstrombba81212001-06-25 05:01:22 +0000751static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100752channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000753{
Damien Millerde6987c2002-01-22 23:20:40 +1100754 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000755
Darren Tucker11327cc2005-03-14 23:22:25 +1100756 /* check buffer limits */
757 limit = MIN(limit, (BUFFER_MAX_LEN - BUFFER_MAX_CHUNK - CHAN_RBUF));
758
Damien Miller33b13562000-04-04 14:38:59 +1000759 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100760 limit > 0 &&
761 buffer_len(&c->input) < limit)
Damien Miller33b13562000-04-04 14:38:59 +1000762 FD_SET(c->rfd, readset);
763 if (c->ostate == CHAN_OUTPUT_OPEN ||
764 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
765 if (buffer_len(&c->output) > 0) {
766 FD_SET(c->wfd, writeset);
767 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000768 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000769 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
770 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000771 else
772 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000773 }
774 }
775 /** XXX check close conditions, too */
Damien Millerde6987c2002-01-22 23:20:40 +1100776 if (compat20 && c->efd != -1) {
Damien Miller33b13562000-04-04 14:38:59 +1000777 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
778 buffer_len(&c->extended) > 0)
779 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000780 else if (!(c->flags & CHAN_EOF_SENT) &&
781 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000782 buffer_len(&c->extended) < c->remote_window)
783 FD_SET(c->efd, readset);
784 }
Damien Miller0e220db2004-06-15 10:34:08 +1000785 /* XXX: What about efd? races? */
Darren Tuckerfc959702004-07-17 16:12:08 +1000786 if (compat20 && c->ctl_fd != -1 &&
Damien Miller0e220db2004-06-15 10:34:08 +1000787 c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN)
788 FD_SET(c->ctl_fd, readset);
Damien Miller33b13562000-04-04 14:38:59 +1000789}
790
Ben Lindstrombba81212001-06-25 05:01:22 +0000791static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100792channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000793{
794 if (buffer_len(&c->input) == 0) {
795 packet_start(SSH_MSG_CHANNEL_CLOSE);
796 packet_put_int(c->remote_id);
797 packet_send();
798 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000799 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000800 }
801}
802
Ben Lindstrombba81212001-06-25 05:01:22 +0000803static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100804channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000805{
806 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000807 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000808 else
Damien Millerb38eff82000-04-01 11:09:21 +1000809 FD_SET(c->sock, writeset);
810}
811
812/*
813 * This is a special state for X11 authentication spoofing. An opened X11
814 * connection (when authentication spoofing is being done) remains in this
815 * state until the first packet has been completely read. The authentication
816 * data in that packet is then substituted by the real data if it matches the
817 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000818 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000819 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000820 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000821static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000822x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000823{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000824 u_char *ucp;
825 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000826
827 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000828 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000829 return 0;
830
831 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100832 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000833 if (ucp[0] == 0x42) { /* Byte order MSB first. */
834 proto_len = 256 * ucp[6] + ucp[7];
835 data_len = 256 * ucp[8] + ucp[9];
836 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
837 proto_len = ucp[6] + 256 * ucp[7];
838 data_len = ucp[8] + 256 * ucp[9];
839 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000840 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100841 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000842 return -1;
843 }
844
845 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000846 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000847 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
848 return 0;
849
850 /* Check if authentication protocol matches. */
851 if (proto_len != strlen(x11_saved_proto) ||
852 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000853 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000854 return -1;
855 }
856 /* Check if authentication data matches our fake data. */
857 if (data_len != x11_fake_data_len ||
858 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
859 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000860 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000861 return -1;
862 }
863 /* Check fake data length */
864 if (x11_fake_data_len != x11_saved_data_len) {
865 error("X11 fake_data_len %d != saved_data_len %d",
866 x11_fake_data_len, x11_saved_data_len);
867 return -1;
868 }
869 /*
870 * Received authentication protocol and data match
871 * our fake data. Substitute the fake data with real
872 * data.
873 */
874 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
875 x11_saved_data, x11_saved_data_len);
876 return 1;
877}
878
Ben Lindstrombba81212001-06-25 05:01:22 +0000879static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100880channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000881{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000882 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000883
Damien Millerb38eff82000-04-01 11:09:21 +1000884 if (ret == 1) {
885 /* Start normal processing for the channel. */
886 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000887 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000888 } else if (ret == -1) {
889 /*
890 * We have received an X11 connection that has bad
891 * authentication information.
892 */
Damien Miller996acd22003-04-09 20:59:48 +1000893 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000894 buffer_clear(&c->input);
895 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000896 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000897 c->sock = -1;
898 c->type = SSH_CHANNEL_CLOSED;
899 packet_start(SSH_MSG_CHANNEL_CLOSE);
900 packet_put_int(c->remote_id);
901 packet_send();
902 }
903}
904
Ben Lindstrombba81212001-06-25 05:01:22 +0000905static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100906channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000907{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000908 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000909
910 /* c->force_drain = 1; */
911
Damien Millerb38eff82000-04-01 11:09:21 +1000912 if (ret == 1) {
913 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100914 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000915 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000916 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000917 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100918 chan_read_failed(c);
919 buffer_clear(&c->input);
920 chan_ibuf_empty(c);
921 buffer_clear(&c->output);
922 /* for proto v1, the peer will send an IEOF */
923 if (compat20)
924 chan_write_failed(c);
925 else
926 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000927 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000928 }
929}
930
Ben Lindstromb3921512001-04-11 15:57:50 +0000931/* try to decode a socks4 header */
Ben Lindstrombba81212001-06-25 05:01:22 +0000932static int
Damien Millerd62f2ca2006-03-26 13:57:41 +1100933channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000934{
Damien Millera10f5612002-09-12 09:49:15 +1000935 char *p, *host;
Damien Millereccb9de2005-06-17 12:59:34 +1000936 u_int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100937 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000938 struct {
939 u_int8_t version;
940 u_int8_t command;
941 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000942 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000943 } s4_req, s4_rsp;
944
Ben Lindstromb3921512001-04-11 15:57:50 +0000945 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000946
947 have = buffer_len(&c->input);
948 len = sizeof(s4_req);
949 if (have < len)
950 return 0;
951 p = buffer_ptr(&c->input);
952 for (found = 0, i = len; i < have; i++) {
953 if (p[i] == '\0') {
954 found = 1;
955 break;
956 }
957 if (i > 1024) {
958 /* the peer is probably sending garbage */
959 debug("channel %d: decode socks4: too long",
960 c->self);
961 return -1;
962 }
963 }
964 if (!found)
965 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000966 buffer_get(&c->input, (char *)&s4_req.version, 1);
967 buffer_get(&c->input, (char *)&s4_req.command, 1);
968 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000969 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000970 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000971 p = buffer_ptr(&c->input);
972 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000973 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000974 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000975 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000976 c->self, len, have);
977 strlcpy(username, p, sizeof(username));
978 buffer_consume(&c->input, len);
979 buffer_consume(&c->input, 1); /* trailing '\0' */
980
Ben Lindstromb3921512001-04-11 15:57:50 +0000981 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000982 strlcpy(c->path, host, sizeof(c->path));
983 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100984
Damien Millerfbdeece2003-09-02 22:52:31 +1000985 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000986 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000987
Ben Lindstromb3921512001-04-11 15:57:50 +0000988 if (s4_req.command != 1) {
989 debug("channel %d: cannot handle: socks4 cn %d",
990 c->self, s4_req.command);
991 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000992 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000993 s4_rsp.version = 0; /* vn: 0 for reply */
994 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000995 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000996 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000997 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000998 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000999}
1000
Darren Tucker46471c92003-07-03 13:55:19 +10001001/* try to decode a socks5 header */
1002#define SSH_SOCKS5_AUTHDONE 0x1000
1003#define SSH_SOCKS5_NOAUTH 0x00
1004#define SSH_SOCKS5_IPV4 0x01
1005#define SSH_SOCKS5_DOMAIN 0x03
1006#define SSH_SOCKS5_IPV6 0x04
1007#define SSH_SOCKS5_CONNECT 0x01
1008#define SSH_SOCKS5_SUCCESS 0x00
1009
1010static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001011channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
Darren Tucker46471c92003-07-03 13:55:19 +10001012{
1013 struct {
1014 u_int8_t version;
1015 u_int8_t command;
1016 u_int8_t reserved;
1017 u_int8_t atyp;
1018 } s5_req, s5_rsp;
1019 u_int16_t dest_port;
1020 u_char *p, dest_addr[255+1];
Damien Millereccb9de2005-06-17 12:59:34 +10001021 u_int have, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001022
1023 debug2("channel %d: decode socks5", c->self);
1024 p = buffer_ptr(&c->input);
1025 if (p[0] != 0x05)
1026 return -1;
1027 have = buffer_len(&c->input);
1028 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1029 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001030 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001031 return 0;
1032 nmethods = p[1];
1033 if (have < nmethods + 2)
1034 return 0;
1035 /* look for method: "NO AUTHENTICATION REQUIRED" */
1036 for (found = 0, i = 2 ; i < nmethods + 2; i++) {
1037 if (p[i] == SSH_SOCKS5_NOAUTH ) {
1038 found = 1;
1039 break;
1040 }
1041 }
1042 if (!found) {
1043 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1044 c->self);
1045 return -1;
1046 }
1047 buffer_consume(&c->input, nmethods + 2);
1048 buffer_put_char(&c->output, 0x05); /* version */
1049 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1050 FD_SET(c->sock, writeset);
1051 c->flags |= SSH_SOCKS5_AUTHDONE;
1052 debug2("channel %d: socks5 auth done", c->self);
1053 return 0; /* need more */
1054 }
1055 debug2("channel %d: socks5 post auth", c->self);
1056 if (have < sizeof(s5_req)+1)
1057 return 0; /* need more */
1058 memcpy((char *)&s5_req, p, sizeof(s5_req));
1059 if (s5_req.version != 0x05 ||
1060 s5_req.command != SSH_SOCKS5_CONNECT ||
1061 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001062 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001063 return -1;
1064 }
Darren Tucker47eede72005-03-14 23:08:12 +11001065 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001066 case SSH_SOCKS5_IPV4:
1067 addrlen = 4;
1068 af = AF_INET;
1069 break;
1070 case SSH_SOCKS5_DOMAIN:
1071 addrlen = p[sizeof(s5_req)];
1072 af = -1;
1073 break;
1074 case SSH_SOCKS5_IPV6:
1075 addrlen = 16;
1076 af = AF_INET6;
1077 break;
1078 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001079 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001080 return -1;
1081 }
1082 if (have < 4 + addrlen + 2)
1083 return 0;
1084 buffer_consume(&c->input, sizeof(s5_req));
1085 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1086 buffer_consume(&c->input, 1); /* host string length */
1087 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1088 buffer_get(&c->input, (char *)&dest_port, 2);
1089 dest_addr[addrlen] = '\0';
1090 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
Darren Tucker1f8311c2004-05-13 16:39:33 +10001091 strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
Darren Tucker46471c92003-07-03 13:55:19 +10001092 else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
1093 return -1;
1094 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001095
Damien Millerfbdeece2003-09-02 22:52:31 +10001096 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001097 c->self, c->path, c->host_port, s5_req.command);
1098
1099 s5_rsp.version = 0x05;
1100 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1101 s5_rsp.reserved = 0; /* ignored */
1102 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1103 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1104 dest_port = 0; /* ignored */
1105
1106 buffer_append(&c->output, (char *)&s5_rsp, sizeof(s5_rsp));
1107 buffer_append(&c->output, (char *)&dest_addr, sizeof(struct in_addr));
1108 buffer_append(&c->output, (char *)&dest_port, sizeof(dest_port));
1109 return 1;
1110}
1111
Ben Lindstromb3921512001-04-11 15:57:50 +00001112/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001113static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001114channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstromb3921512001-04-11 15:57:50 +00001115{
1116 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001117 u_int have;
1118 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001119
1120 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +10001121 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +00001122 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001123 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001124 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001125 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001126 /* need more */
1127 FD_SET(c->sock, readset);
1128 return;
1129 }
1130 /* try to guess the protocol */
1131 p = buffer_ptr(&c->input);
1132 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001133 case 0x04:
1134 ret = channel_decode_socks4(c, readset, writeset);
1135 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001136 case 0x05:
1137 ret = channel_decode_socks5(c, readset, writeset);
1138 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001139 default:
1140 ret = -1;
1141 break;
1142 }
1143 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001144 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001145 } else if (ret == 0) {
1146 debug2("channel %d: pre_dynamic: need more", c->self);
1147 /* need more */
1148 FD_SET(c->sock, readset);
1149 } else {
1150 /* switch to the next state */
1151 c->type = SSH_CHANNEL_OPENING;
1152 port_open_helper(c, "direct-tcpip");
1153 }
1154}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001155
Damien Millerb38eff82000-04-01 11:09:21 +10001156/* This is our fake X11 server socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +00001157static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001158channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001159{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001160 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001161 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001162 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001163 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001164 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001165 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001166
1167 if (FD_ISSET(c->sock, readset)) {
1168 debug("X11 connection requested.");
1169 addrlen = sizeof(addr);
1170 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001171 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001172 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001173 channel_close_fd(&c->sock);
1174 chan_mark_dead(c);
1175 }
Damien Millerb38eff82000-04-01 11:09:21 +10001176 if (newsock < 0) {
1177 error("accept: %.100s", strerror(errno));
1178 return;
1179 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001180 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001181 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001182 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001183 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001184 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001185
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001186 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001187 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001188 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001189 if (compat20) {
1190 packet_start(SSH2_MSG_CHANNEL_OPEN);
1191 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001192 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001193 packet_put_int(nc->local_window_max);
1194 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001195 /* originator ipaddr and port */
1196 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001197 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001198 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001199 } else {
1200 packet_put_int(remote_port);
1201 }
Damien Millerbd483e72000-04-30 10:00:53 +10001202 packet_send();
1203 } else {
1204 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001205 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001206 if (packet_get_protocol_flags() &
1207 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001208 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001209 packet_send();
1210 }
Damien Millerd83ff352001-01-30 09:19:34 +11001211 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001212 }
1213}
1214
Ben Lindstrombba81212001-06-25 05:01:22 +00001215static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001216port_open_helper(Channel *c, char *rtype)
1217{
1218 int direct;
1219 char buf[1024];
1220 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001221 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001222
1223 direct = (strcmp(rtype, "direct-tcpip") == 0);
1224
1225 snprintf(buf, sizeof buf,
1226 "%s: listening port %d for %.100s port %d, "
1227 "connect from %.200s port %d",
1228 rtype, c->listening_port, c->path, c->host_port,
1229 remote_ipaddr, remote_port);
1230
1231 xfree(c->remote_name);
1232 c->remote_name = xstrdup(buf);
1233
1234 if (compat20) {
1235 packet_start(SSH2_MSG_CHANNEL_OPEN);
1236 packet_put_cstring(rtype);
1237 packet_put_int(c->self);
1238 packet_put_int(c->local_window_max);
1239 packet_put_int(c->local_maxpacket);
1240 if (direct) {
1241 /* target host, port */
1242 packet_put_cstring(c->path);
1243 packet_put_int(c->host_port);
1244 } else {
1245 /* listen address, port */
1246 packet_put_cstring(c->path);
1247 packet_put_int(c->listening_port);
1248 }
1249 /* originator host and port */
1250 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001251 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001252 packet_send();
1253 } else {
1254 packet_start(SSH_MSG_PORT_OPEN);
1255 packet_put_int(c->self);
1256 packet_put_cstring(c->path);
1257 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001258 if (packet_get_protocol_flags() &
1259 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001260 packet_put_cstring(c->remote_name);
1261 packet_send();
1262 }
1263 xfree(remote_ipaddr);
1264}
1265
Damien Miller5e7fd072005-11-05 14:53:39 +11001266static void
1267channel_set_reuseaddr(int fd)
1268{
1269 int on = 1;
1270
1271 /*
1272 * Set socket options.
1273 * Allow local port reuse in TIME_WAIT.
1274 */
1275 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1276 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1277}
1278
Damien Millerb38eff82000-04-01 11:09:21 +10001279/*
1280 * This socket is listening for connections to a forwarded TCP/IP port.
1281 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001282static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001283channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001284{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001285 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001286 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001287 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001288 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001289 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001290
Damien Millerb38eff82000-04-01 11:09:21 +10001291 if (FD_ISSET(c->sock, readset)) {
1292 debug("Connection to port %d forwarding "
1293 "to %.100s port %d requested.",
1294 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001295
Damien Miller4623a752001-10-10 15:03:58 +10001296 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1297 nextstate = SSH_CHANNEL_OPENING;
1298 rtype = "forwarded-tcpip";
1299 } else {
1300 if (c->host_port == 0) {
1301 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001302 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001303 } else {
1304 nextstate = SSH_CHANNEL_OPENING;
1305 rtype = "direct-tcpip";
1306 }
1307 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001308
Damien Millerb38eff82000-04-01 11:09:21 +10001309 addrlen = sizeof(addr);
1310 newsock = accept(c->sock, &addr, &addrlen);
1311 if (newsock < 0) {
1312 error("accept: %.100s", strerror(errno));
1313 return;
1314 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001315 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001316 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1317 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001318 nc->listening_port = c->listening_port;
1319 nc->host_port = c->host_port;
1320 strlcpy(nc->path, c->path, sizeof(nc->path));
1321
Damien Miller4623a752001-10-10 15:03:58 +10001322 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1323 /*
1324 * do not call the channel_post handler until
1325 * this flag has been reset by a pre-handler.
1326 * otherwise the FD_ISSET calls might overflow
1327 */
1328 nc->delayed = 1;
1329 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001330 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001331 }
Damien Millerb38eff82000-04-01 11:09:21 +10001332 }
1333}
1334
1335/*
1336 * This is the authentication agent socket listening for connections from
1337 * clients.
1338 */
Ben Lindstrombba81212001-06-25 05:01:22 +00001339static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001340channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001341{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001342 Channel *nc;
1343 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001344 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001345 socklen_t addrlen;
1346
1347 if (FD_ISSET(c->sock, readset)) {
1348 addrlen = sizeof(addr);
1349 newsock = accept(c->sock, &addr, &addrlen);
1350 if (newsock < 0) {
1351 error("accept from auth socket: %.100s", strerror(errno));
1352 return;
1353 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001354 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001355 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1356 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001357 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001358 if (compat20) {
1359 packet_start(SSH2_MSG_CHANNEL_OPEN);
1360 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001361 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001362 packet_put_int(c->local_window_max);
1363 packet_put_int(c->local_maxpacket);
1364 } else {
1365 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001366 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001367 }
Damien Millerb38eff82000-04-01 11:09:21 +10001368 packet_send();
1369 }
1370}
1371
Ben Lindstrombba81212001-06-25 05:01:22 +00001372static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001373channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001374{
Ben Lindstrom69128662001-05-08 20:07:39 +00001375 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001376 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001377
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001378 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001379 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001380 err = errno;
1381 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001382 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001383 if (err == 0) {
1384 debug("channel %d: connected", c->self);
1385 c->type = SSH_CHANNEL_OPEN;
1386 if (compat20) {
1387 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1388 packet_put_int(c->remote_id);
1389 packet_put_int(c->self);
1390 packet_put_int(c->local_window);
1391 packet_put_int(c->local_maxpacket);
1392 } else {
1393 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1394 packet_put_int(c->remote_id);
1395 packet_put_int(c->self);
1396 }
1397 } else {
1398 debug("channel %d: not connected: %s",
1399 c->self, strerror(err));
1400 if (compat20) {
1401 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1402 packet_put_int(c->remote_id);
1403 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1404 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1405 packet_put_cstring(strerror(err));
1406 packet_put_cstring("");
1407 }
1408 } else {
1409 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1410 packet_put_int(c->remote_id);
1411 }
1412 chan_mark_dead(c);
1413 }
1414 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001415 }
1416}
1417
Ben Lindstrombba81212001-06-25 05:01:22 +00001418static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001419channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001420{
Darren Tucker11327cc2005-03-14 23:22:25 +11001421 char buf[CHAN_RBUF];
Damien Millerb38eff82000-04-01 11:09:21 +10001422 int len;
1423
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001424 if (c->rfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001425 FD_ISSET(c->rfd, readset)) {
1426 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +10001427 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1428 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001429 if (len <= 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001430 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001431 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001432 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001433 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001434 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001435 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001436 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001437 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001438 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001439 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001440 } else {
1441 chan_read_failed(c);
1442 }
1443 return -1;
1444 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001445 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001446 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001447 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001448 chan_read_failed(c);
1449 }
Damien Millerd27b9472005-12-13 19:29:02 +11001450 } else if (c->datagram) {
1451 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001452 } else {
1453 buffer_append(&c->input, buf, len);
1454 }
Damien Millerb38eff82000-04-01 11:09:21 +10001455 }
1456 return 1;
1457}
Ben Lindstrombba81212001-06-25 05:01:22 +00001458static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001459channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001460{
Ben Lindstrome229b252001-03-05 06:28:06 +00001461 struct termios tio;
Damien Miller077b2382005-12-31 16:22:32 +11001462 u_char *data = NULL, *buf;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001463 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001464 int len;
1465
1466 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001467 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001468 FD_ISSET(c->wfd, writeset) &&
1469 buffer_len(&c->output) > 0) {
Damien Miller077b2382005-12-31 16:22:32 +11001470 if (c->output_filter != NULL) {
1471 if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1472 debug2("channel %d: filter stops", c->self);
Damien Millere204f6a2006-01-31 21:47:15 +11001473 if (c->type != SSH_CHANNEL_OPEN)
1474 chan_mark_dead(c);
1475 else
1476 chan_write_failed(c);
1477 return -1;
Damien Miller077b2382005-12-31 16:22:32 +11001478 }
1479 } else if (c->datagram) {
1480 buf = data = buffer_get_string(&c->output, &dlen);
1481 } else {
1482 buf = data = buffer_ptr(&c->output);
1483 dlen = buffer_len(&c->output);
1484 }
1485
Damien Millerd27b9472005-12-13 19:29:02 +11001486 if (c->datagram) {
Damien Millerd27b9472005-12-13 19:29:02 +11001487 /* ignore truncated writes, datagrams might get lost */
1488 c->local_consumed += dlen + 4;
Damien Miller077b2382005-12-31 16:22:32 +11001489 len = write(c->wfd, buf, dlen);
Damien Millerd27b9472005-12-13 19:29:02 +11001490 xfree(data);
1491 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1492 return 1;
1493 if (len <= 0) {
1494 if (c->type != SSH_CHANNEL_OPEN)
1495 chan_mark_dead(c);
1496 else
1497 chan_write_failed(c);
1498 return -1;
1499 }
1500 return 1;
1501 }
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001502#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001503 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001504 if (compat20 && c->wfd_isatty)
1505 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001506#endif
Damien Miller077b2382005-12-31 16:22:32 +11001507
1508 len = write(c->wfd, buf, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001509 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1510 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001511 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001512 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001513 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001514 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001515 return -1;
1516 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001517 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001518 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001519 c->type = SSH_CHANNEL_INPUT_DRAINING;
1520 } else {
1521 chan_write_failed(c);
1522 }
1523 return -1;
1524 }
Damien Miller077b2382005-12-31 16:22:32 +11001525 if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001526 if (tcgetattr(c->wfd, &tio) == 0 &&
1527 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1528 /*
1529 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001530 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001531 * size of a SSH2_MSG_CHANNEL_DATA message
Damien Miller077b2382005-12-31 16:22:32 +11001532 * (4 byte channel id + buf)
Damien Miller79438cc2001-02-16 12:34:57 +11001533 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001534 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001535 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001536 }
1537 }
Damien Millerb38eff82000-04-01 11:09:21 +10001538 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001539 if (compat20 && len > 0) {
1540 c->local_consumed += len;
1541 }
1542 }
1543 return 1;
1544}
Ben Lindstrombba81212001-06-25 05:01:22 +00001545static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001546channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller33b13562000-04-04 14:38:59 +10001547{
Darren Tucker11327cc2005-03-14 23:22:25 +11001548 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001549 int len;
1550
Damien Miller1383bd82000-04-06 12:32:37 +10001551/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001552 if (c->efd != -1) {
1553 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1554 FD_ISSET(c->efd, writeset) &&
1555 buffer_len(&c->extended) > 0) {
1556 len = write(c->efd, buffer_ptr(&c->extended),
1557 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001558 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001559 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001560 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1561 return 1;
1562 if (len <= 0) {
1563 debug2("channel %d: closing write-efd %d",
1564 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001565 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001566 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001567 buffer_consume(&c->extended, len);
1568 c->local_consumed += len;
1569 }
1570 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1571 FD_ISSET(c->efd, readset)) {
1572 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001573 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001574 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001575 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1576 return 1;
1577 if (len <= 0) {
1578 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001579 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001580 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001581 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001582 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001583 }
Damien Miller33b13562000-04-04 14:38:59 +10001584 }
1585 }
1586 return 1;
1587}
Ben Lindstrombba81212001-06-25 05:01:22 +00001588static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001589channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller0e220db2004-06-15 10:34:08 +10001590{
1591 char buf[16];
1592 int len;
1593
1594 /* Monitor control fd to detect if the slave client exits */
1595 if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) {
1596 len = read(c->ctl_fd, buf, sizeof(buf));
1597 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1598 return 1;
1599 if (len <= 0) {
1600 debug2("channel %d: ctl read<=0", c->self);
1601 if (c->type != SSH_CHANNEL_OPEN) {
1602 debug2("channel %d: not open", c->self);
1603 chan_mark_dead(c);
1604 return -1;
1605 } else {
1606 chan_read_failed(c);
1607 chan_write_failed(c);
1608 }
1609 return -1;
1610 } else
1611 fatal("%s: unexpected data on ctl fd", __func__);
1612 }
1613 return 1;
1614}
1615static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001616channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001617{
Ben Lindstromb3921512001-04-11 15:57:50 +00001618 if (c->type == SSH_CHANNEL_OPEN &&
1619 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001620 c->local_window < c->local_window_max/2 &&
1621 c->local_consumed > 0) {
1622 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1623 packet_put_int(c->remote_id);
1624 packet_put_int(c->local_consumed);
1625 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001626 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001627 c->self, c->local_window,
1628 c->local_consumed);
1629 c->local_window += c->local_consumed;
1630 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001631 }
1632 return 1;
1633}
1634
Ben Lindstrombba81212001-06-25 05:01:22 +00001635static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001636channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001637{
Damien Miller4623a752001-10-10 15:03:58 +10001638 if (c->delayed)
1639 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001640 channel_handle_rfd(c, readset, writeset);
1641 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001642 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001643 return;
Damien Miller33b13562000-04-04 14:38:59 +10001644 channel_handle_efd(c, readset, writeset);
Damien Miller0e220db2004-06-15 10:34:08 +10001645 channel_handle_ctl(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001646 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001647}
1648
Ben Lindstrombba81212001-06-25 05:01:22 +00001649static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001650channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001651{
1652 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001653
Damien Millerb38eff82000-04-01 11:09:21 +10001654 /* Send buffered output data to the socket. */
1655 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1656 len = write(c->sock, buffer_ptr(&c->output),
1657 buffer_len(&c->output));
1658 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001659 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001660 else
1661 buffer_consume(&c->output, len);
1662 }
1663}
1664
Ben Lindstrombba81212001-06-25 05:01:22 +00001665static void
Damien Miller33b13562000-04-04 14:38:59 +10001666channel_handler_init_20(void)
1667{
Damien Millerde6987c2002-01-22 23:20:40 +11001668 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001669 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001670 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001671 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001672 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001673 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001674 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001675 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001676
Damien Millerde6987c2002-01-22 23:20:40 +11001677 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001678 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001679 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001680 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001681 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001682 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001683 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001684}
1685
Ben Lindstrombba81212001-06-25 05:01:22 +00001686static void
Damien Millerb38eff82000-04-01 11:09:21 +10001687channel_handler_init_13(void)
1688{
1689 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1690 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1691 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1692 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1693 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1694 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1695 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001696 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001697 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001698
Damien Millerde6987c2002-01-22 23:20:40 +11001699 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001700 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1701 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1702 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1703 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001704 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001705 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001706}
1707
Ben Lindstrombba81212001-06-25 05:01:22 +00001708static void
Damien Millerb38eff82000-04-01 11:09:21 +10001709channel_handler_init_15(void)
1710{
Damien Millerde6987c2002-01-22 23:20:40 +11001711 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001712 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001713 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1714 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1715 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001716 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001717 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001718
1719 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1720 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1721 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001722 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001723 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001724 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001725}
1726
Ben Lindstrombba81212001-06-25 05:01:22 +00001727static void
Damien Millerb38eff82000-04-01 11:09:21 +10001728channel_handler_init(void)
1729{
1730 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001731
Damien Miller9f0f5c62001-12-21 14:45:46 +11001732 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001733 channel_pre[i] = NULL;
1734 channel_post[i] = NULL;
1735 }
Damien Miller33b13562000-04-04 14:38:59 +10001736 if (compat20)
1737 channel_handler_init_20();
1738 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001739 channel_handler_init_13();
1740 else
1741 channel_handler_init_15();
1742}
1743
Damien Miller3ec27592001-10-12 11:35:04 +10001744/* gc dead channels */
1745static void
1746channel_garbage_collect(Channel *c)
1747{
1748 if (c == NULL)
1749 return;
1750 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11001751 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10001752 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001753 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001754 c->detach_user(c->self, NULL);
1755 /* if we still have a callback */
1756 if (c->detach_user != NULL)
1757 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001758 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001759 }
1760 if (!chan_is_dead(c, 1))
1761 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001762 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001763 channel_free(c);
1764}
1765
Ben Lindstrombba81212001-06-25 05:01:22 +00001766static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001767channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001768{
1769 static int did_init = 0;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001770 u_int i;
Damien Millerb38eff82000-04-01 11:09:21 +10001771 Channel *c;
1772
1773 if (!did_init) {
1774 channel_handler_init();
1775 did_init = 1;
1776 }
1777 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001778 c = channels[i];
1779 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001780 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001781 if (ftab[c->type] != NULL)
1782 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001783 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001784 }
1785}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001786
Ben Lindstrome9c99912001-06-09 00:41:05 +00001787/*
1788 * Allocate/update select bitmasks and add any bits relevant to channels in
1789 * select bitmasks.
1790 */
Damien Miller4af51302000-04-16 11:18:38 +10001791void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001792channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001793 u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001794{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001795 u_int n, sz;
Damien Miller5e953212001-01-30 09:14:00 +11001796
1797 n = MAX(*maxfdp, channel_max_fd);
1798
1799 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001800 /* perhaps check sz < nalloc/2 and shrink? */
1801 if (*readsetp == NULL || sz > *nallocp) {
1802 *readsetp = xrealloc(*readsetp, sz);
1803 *writesetp = xrealloc(*writesetp, sz);
1804 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001805 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001806 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001807 memset(*readsetp, 0, sz);
1808 memset(*writesetp, 0, sz);
1809
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001810 if (!rekeying)
1811 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001812}
1813
Ben Lindstrome9c99912001-06-09 00:41:05 +00001814/*
1815 * After select, perform any appropriate operations for channels which have
1816 * events pending.
1817 */
Damien Miller4af51302000-04-16 11:18:38 +10001818void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001819channel_after_select(fd_set *readset, fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001820{
Damien Millerb38eff82000-04-01 11:09:21 +10001821 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001822}
1823
Ben Lindstrome9c99912001-06-09 00:41:05 +00001824
Damien Miller5e953212001-01-30 09:14:00 +11001825/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001826
Damien Miller4af51302000-04-16 11:18:38 +10001827void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001828channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001829{
Damien Millerb38eff82000-04-01 11:09:21 +10001830 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001831 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001832
Damien Miller95def091999-11-25 00:26:21 +11001833 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001834 c = channels[i];
1835 if (c == NULL)
1836 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001837
Ben Lindstrome9c99912001-06-09 00:41:05 +00001838 /*
1839 * We are only interested in channels that can have buffered
1840 * incoming data.
1841 */
Damien Miller34132e52000-01-14 15:45:46 +11001842 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001843 if (c->type != SSH_CHANNEL_OPEN &&
1844 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001845 continue;
1846 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001847 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001848 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001849 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001850 if (compat20 &&
1851 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001852 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001853 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001854 continue;
1855 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001856
Damien Miller95def091999-11-25 00:26:21 +11001857 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001858 if ((c->istate == CHAN_INPUT_OPEN ||
1859 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1860 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11001861 if (c->datagram) {
1862 if (len > 0) {
1863 u_char *data;
1864 u_int dlen;
1865
1866 data = buffer_get_string(&c->input,
1867 &dlen);
1868 packet_start(SSH2_MSG_CHANNEL_DATA);
1869 packet_put_int(c->remote_id);
1870 packet_put_string(data, dlen);
1871 packet_send();
1872 c->remote_window -= dlen + 4;
1873 xfree(data);
1874 }
1875 continue;
1876 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001877 /*
1878 * Send some data for the other side over the secure
1879 * connection.
1880 */
Damien Miller33b13562000-04-04 14:38:59 +10001881 if (compat20) {
1882 if (len > c->remote_window)
1883 len = c->remote_window;
1884 if (len > c->remote_maxpacket)
1885 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001886 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001887 if (packet_is_interactive()) {
1888 if (len > 1024)
1889 len = 512;
1890 } else {
1891 /* Keep the packets at reasonable size. */
1892 if (len > packet_get_maxsize()/2)
1893 len = packet_get_maxsize()/2;
1894 }
Damien Miller95def091999-11-25 00:26:21 +11001895 }
Damien Millerb38eff82000-04-01 11:09:21 +10001896 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001897 packet_start(compat20 ?
1898 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001899 packet_put_int(c->remote_id);
1900 packet_put_string(buffer_ptr(&c->input), len);
1901 packet_send();
1902 buffer_consume(&c->input, len);
1903 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001904 }
1905 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001906 if (compat13)
1907 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001908 /*
1909 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001910 * tell peer, that we will not send more data: send IEOF.
1911 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001912 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001913 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10001914 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1915 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00001916 else
1917 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001918 }
Damien Miller33b13562000-04-04 14:38:59 +10001919 /* Send extended data, i.e. stderr */
1920 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001921 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001922 c->remote_window > 0 &&
1923 (len = buffer_len(&c->extended)) > 0 &&
1924 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001925 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001926 c->self, c->remote_window, buffer_len(&c->extended),
1927 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001928 if (len > c->remote_window)
1929 len = c->remote_window;
1930 if (len > c->remote_maxpacket)
1931 len = c->remote_maxpacket;
1932 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1933 packet_put_int(c->remote_id);
1934 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1935 packet_put_string(buffer_ptr(&c->extended), len);
1936 packet_send();
1937 buffer_consume(&c->extended, len);
1938 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001939 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001940 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001941 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001942}
1943
Ben Lindstrome9c99912001-06-09 00:41:05 +00001944
1945/* -- protocol input */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001946
Damien Miller4af51302000-04-16 11:18:38 +10001947void
Damien Miller630d6f42002-01-22 23:17:30 +11001948channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001949{
Damien Miller34132e52000-01-14 15:45:46 +11001950 int id;
Damien Miller95def091999-11-25 00:26:21 +11001951 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001952 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001953 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001954
Damien Miller95def091999-11-25 00:26:21 +11001955 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001956 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001957 c = channel_lookup(id);
1958 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001959 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001960
Damien Miller95def091999-11-25 00:26:21 +11001961 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001962 if (c->type != SSH_CHANNEL_OPEN &&
1963 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001964 return;
1965
Damien Miller95def091999-11-25 00:26:21 +11001966 /* Get the data. */
1967 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10001968
Damien Millera04ad492004-01-21 11:02:09 +11001969 /*
1970 * Ignore data for protocol > 1.3 if output end is no longer open.
1971 * For protocol 2 the sending side is reducing its window as it sends
1972 * data, so we must 'fake' consumption of the data in order to ensure
1973 * that window updates are sent back. Otherwise the connection might
1974 * deadlock.
1975 */
1976 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
1977 if (compat20) {
1978 c->local_window -= data_len;
1979 c->local_consumed += data_len;
1980 }
1981 xfree(data);
1982 return;
1983 }
1984
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001985 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10001986 if (data_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10001987 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller33b13562000-04-04 14:38:59 +10001988 c->self, data_len, c->local_maxpacket);
1989 }
1990 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10001991 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10001992 c->self, data_len, c->local_window);
1993 xfree(data);
1994 return;
1995 }
1996 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001997 }
Damien Miller48b03fc2002-01-22 23:11:40 +11001998 packet_check_eom();
Damien Millerd27b9472005-12-13 19:29:02 +11001999 if (c->datagram)
2000 buffer_put_string(&c->output, data, data_len);
2001 else
2002 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11002003 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002004}
Ben Lindstrome9c99912001-06-09 00:41:05 +00002005
Damien Miller4af51302000-04-16 11:18:38 +10002006void
Damien Miller630d6f42002-01-22 23:17:30 +11002007channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002008{
2009 int id;
Damien Miller33b13562000-04-04 14:38:59 +10002010 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00002011 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10002012 Channel *c;
2013
2014 /* Get the channel number and verify it. */
2015 id = packet_get_int();
2016 c = channel_lookup(id);
2017
2018 if (c == NULL)
2019 packet_disconnect("Received extended_data for bad channel %d.", id);
2020 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002021 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10002022 return;
2023 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002024 if (c->flags & CHAN_EOF_RCVD) {
2025 if (datafellows & SSH_BUG_EXTEOF)
2026 debug("channel %d: accepting ext data after eof", id);
2027 else
2028 packet_disconnect("Received extended_data after EOF "
2029 "on channel %d.", id);
2030 }
Damien Miller33b13562000-04-04 14:38:59 +10002031 tcode = packet_get_int();
2032 if (c->efd == -1 ||
2033 c->extended_usage != CHAN_EXTENDED_WRITE ||
2034 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002035 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002036 return;
2037 }
2038 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002039 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002040 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002041 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002042 c->self, data_len, c->local_window);
2043 xfree(data);
2044 return;
2045 }
Damien Millerd3444942000-09-30 14:20:03 +11002046 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002047 c->local_window -= data_len;
2048 buffer_append(&c->extended, data, data_len);
2049 xfree(data);
2050}
2051
Damien Miller4af51302000-04-16 11:18:38 +10002052void
Damien Miller630d6f42002-01-22 23:17:30 +11002053channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002054{
2055 int id;
2056 Channel *c;
2057
Damien Millerb38eff82000-04-01 11:09:21 +10002058 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002059 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002060 c = channel_lookup(id);
2061 if (c == NULL)
2062 packet_disconnect("Received ieof for nonexistent channel %d.", id);
2063 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002064
2065 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002066 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002067 debug("channel %d: FORCE input drain", c->self);
2068 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002069 if (buffer_len(&c->input) == 0)
2070 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002071 }
2072
Damien Millerb38eff82000-04-01 11:09:21 +10002073}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002074
Damien Miller4af51302000-04-16 11:18:38 +10002075void
Damien Miller630d6f42002-01-22 23:17:30 +11002076channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002077{
Damien Millerb38eff82000-04-01 11:09:21 +10002078 int id;
2079 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002080
Damien Millerb38eff82000-04-01 11:09:21 +10002081 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002082 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002083 c = channel_lookup(id);
2084 if (c == NULL)
2085 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002086
2087 /*
2088 * Send a confirmation that we have closed the channel and no more
2089 * data is coming for it.
2090 */
Damien Miller95def091999-11-25 00:26:21 +11002091 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002092 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002093 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002094
Damien Miller5428f641999-11-25 11:54:57 +11002095 /*
2096 * If the channel is in closed state, we have sent a close request,
2097 * and the other side will eventually respond with a confirmation.
2098 * Thus, we cannot free the channel here, because then there would be
2099 * no-one to receive the confirmation. The channel gets freed when
2100 * the confirmation arrives.
2101 */
Damien Millerb38eff82000-04-01 11:09:21 +10002102 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002103 /*
2104 * Not a closed channel - mark it as draining, which will
2105 * cause it to be freed later.
2106 */
Damien Miller76765c02002-01-22 23:21:15 +11002107 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002108 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002109 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002110}
2111
Damien Millerb38eff82000-04-01 11:09:21 +10002112/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10002113void
Damien Miller630d6f42002-01-22 23:17:30 +11002114channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002115{
Damien Millerb38eff82000-04-01 11:09:21 +10002116 int id = packet_get_int();
2117 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002118
Damien Miller48b03fc2002-01-22 23:11:40 +11002119 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002120 if (c == NULL)
2121 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2122 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002123}
2124
Damien Miller4af51302000-04-16 11:18:38 +10002125void
Damien Miller630d6f42002-01-22 23:17:30 +11002126channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002127{
2128 int id = packet_get_int();
2129 Channel *c = channel_lookup(id);
2130
Damien Miller48b03fc2002-01-22 23:11:40 +11002131 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002132 if (c == NULL)
2133 packet_disconnect("Received close confirmation for "
2134 "out-of-range channel %d.", id);
2135 if (c->type != SSH_CHANNEL_CLOSED)
2136 packet_disconnect("Received close confirmation for "
2137 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002138 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002139}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002140
Damien Miller4af51302000-04-16 11:18:38 +10002141void
Damien Miller630d6f42002-01-22 23:17:30 +11002142channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002143{
Damien Millerb38eff82000-04-01 11:09:21 +10002144 int id, remote_id;
2145 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002146
Damien Millerb38eff82000-04-01 11:09:21 +10002147 id = packet_get_int();
2148 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002149
Damien Millerb38eff82000-04-01 11:09:21 +10002150 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2151 packet_disconnect("Received open confirmation for "
2152 "non-opening channel %d.", id);
2153 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002154 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002155 c->remote_id = remote_id;
2156 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002157
2158 if (compat20) {
2159 c->remote_window = packet_get_int();
2160 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11002161 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002162 debug2("callback start");
Damien Miller0e220db2004-06-15 10:34:08 +10002163 c->confirm(c->self, c->confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002164 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002165 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002166 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002167 c->remote_window, c->remote_maxpacket);
2168 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002169 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002170}
2171
Ben Lindstrombba81212001-06-25 05:01:22 +00002172static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002173reason2txt(int reason)
2174{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002175 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002176 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2177 return "administratively prohibited";
2178 case SSH2_OPEN_CONNECT_FAILED:
2179 return "connect failed";
2180 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2181 return "unknown channel type";
2182 case SSH2_OPEN_RESOURCE_SHORTAGE:
2183 return "resource shortage";
2184 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002185 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002186}
2187
Damien Miller4af51302000-04-16 11:18:38 +10002188void
Damien Miller630d6f42002-01-22 23:17:30 +11002189channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002190{
Kevin Steves12057502001-02-05 14:54:34 +00002191 int id, reason;
2192 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002193 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002194
Damien Millerb38eff82000-04-01 11:09:21 +10002195 id = packet_get_int();
2196 c = channel_lookup(id);
2197
2198 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2199 packet_disconnect("Received open failure for "
2200 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002201 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002202 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002203 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002204 msg = packet_get_string(NULL);
2205 lang = packet_get_string(NULL);
2206 }
Damien Miller996acd22003-04-09 20:59:48 +10002207 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002208 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002209 if (msg != NULL)
2210 xfree(msg);
2211 if (lang != NULL)
2212 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10002213 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002214 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11002215 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002216 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002217}
2218
Damien Miller33b13562000-04-04 14:38:59 +10002219void
Damien Miller630d6f42002-01-22 23:17:30 +11002220channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002221{
2222 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002223 int id;
2224 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002225
2226 if (!compat20)
2227 return;
2228
2229 /* Get the channel number and verify it. */
2230 id = packet_get_int();
2231 c = channel_lookup(id);
2232
Damien Millerd47c62a2005-12-13 19:33:57 +11002233 if (c == NULL) {
2234 logit("Received window adjust for non-open channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002235 return;
2236 }
2237 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002238 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002239 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002240 c->remote_window += adjust;
2241}
2242
Damien Miller4af51302000-04-16 11:18:38 +10002243void
Damien Miller630d6f42002-01-22 23:17:30 +11002244channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002245{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002246 Channel *c = NULL;
2247 u_short host_port;
2248 char *host, *originator_string;
2249 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002250
Ben Lindstrome9c99912001-06-09 00:41:05 +00002251 remote_id = packet_get_int();
2252 host = packet_get_string(NULL);
2253 host_port = packet_get_int();
2254
2255 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2256 originator_string = packet_get_string(NULL);
2257 } else {
2258 originator_string = xstrdup("unknown (remote did not supply name)");
2259 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002260 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002261 sock = channel_connect_to(host, host_port);
2262 if (sock != -1) {
2263 c = channel_new("connected socket",
2264 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2265 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002266 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002267 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002268 xfree(originator_string);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002269 if (c == NULL) {
2270 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2271 packet_put_int(remote_id);
2272 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002273 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002274 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002275}
2276
2277
Ben Lindstrome9c99912001-06-09 00:41:05 +00002278/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002279
Ben Lindstrom908afed2001-10-03 17:34:59 +00002280void
2281channel_set_af(int af)
2282{
2283 IPv4or6 = af;
2284}
2285
Damien Millerb16461c2002-01-22 23:29:22 +11002286static int
2287channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2288 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002289{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002290 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002291 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002292 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002293 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002294 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002295
Damien Millerb16461c2002-01-22 23:29:22 +11002296 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2297 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002298 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002299
Damien Millerb16461c2002-01-22 23:29:22 +11002300 if (host == NULL) {
2301 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002302 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002303 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002304 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002305 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002306 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002307 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002308
Damien Miller5428f641999-11-25 11:54:57 +11002309 /*
Damien Millerf91ee4c2005-03-01 21:24:33 +11002310 * Determine whether or not a port forward listens to loopback,
Darren Tucker47eede72005-03-14 23:08:12 +11002311 * specified address or wildcard. On the client, a specified bind
2312 * address will always override gateway_ports. On the server, a
2313 * gateway_ports of 1 (``yes'') will override the client's
2314 * specification and force a wildcard bind, whereas a value of 2
2315 * (``clientspecified'') will bind to whatever address the client
Damien Millerf91ee4c2005-03-01 21:24:33 +11002316 * asked for.
2317 *
2318 * Special-case listen_addrs are:
2319 *
2320 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2321 * "" (empty string), "*" -> wildcard v4/v6
2322 * "localhost" -> loopback v4/v6
2323 */
2324 addr = NULL;
2325 if (listen_addr == NULL) {
2326 /* No address specified: default to gateway_ports setting */
2327 if (gateway_ports)
2328 wildcard = 1;
2329 } else if (gateway_ports || is_client) {
2330 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
2331 strcmp(listen_addr, "0.0.0.0") == 0) ||
2332 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2333 (!is_client && gateway_ports == 1))
2334 wildcard = 1;
2335 else if (strcmp(listen_addr, "localhost") != 0)
2336 addr = listen_addr;
2337 }
2338
2339 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2340 type, wildcard, (addr == NULL) ? "NULL" : addr);
2341
2342 /*
Damien Miller34132e52000-01-14 15:45:46 +11002343 * getaddrinfo returns a loopback address if the hostname is
2344 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002345 */
Damien Miller34132e52000-01-14 15:45:46 +11002346 memset(&hints, 0, sizeof(hints));
2347 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002348 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002349 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002350 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002351 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2352 if (addr == NULL) {
2353 /* This really shouldn't happen */
2354 packet_disconnect("getaddrinfo: fatal error: %s",
2355 gai_strerror(r));
2356 } else {
Damien Millera7270302005-07-06 09:36:05 +10002357 error("channel_setup_fwd_listener: "
Damien Millerf91ee4c2005-03-01 21:24:33 +11002358 "getaddrinfo(%.64s): %s", addr, gai_strerror(r));
2359 }
Damien Millera7270302005-07-06 09:36:05 +10002360 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002361 }
Damien Miller5428f641999-11-25 11:54:57 +11002362
Damien Miller34132e52000-01-14 15:45:46 +11002363 for (ai = aitop; ai; ai = ai->ai_next) {
2364 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2365 continue;
2366 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2367 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002368 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002369 continue;
2370 }
2371 /* Create a port to listen for the host. */
Damien Miller2372ace2003-05-14 13:42:23 +10002372 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002373 if (sock < 0) {
2374 /* this is no error since kernel may not support ipv6 */
2375 verbose("socket: %.100s", strerror(errno));
2376 continue;
2377 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002378
2379 channel_set_reuseaddr(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002380
Damien Miller34132e52000-01-14 15:45:46 +11002381 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002382
Damien Miller34132e52000-01-14 15:45:46 +11002383 /* Bind the socket to the address. */
2384 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2385 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002386 if (!ai->ai_next)
2387 error("bind: %.100s", strerror(errno));
2388 else
2389 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002390
Damien Miller34132e52000-01-14 15:45:46 +11002391 close(sock);
2392 continue;
2393 }
2394 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002395 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002396 error("listen: %.100s", strerror(errno));
2397 close(sock);
2398 continue;
2399 }
2400 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002401 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002402 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002403 0, "port listener", 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002404 strlcpy(c->path, host, sizeof(c->path));
2405 c->host_port = port_to_connect;
2406 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002407 success = 1;
2408 }
2409 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002410 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002411 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002412 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002413 return success;
Damien Miller95def091999-11-25 00:26:21 +11002414}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002415
Darren Tuckere7066df2004-05-24 10:18:05 +10002416int
2417channel_cancel_rport_listener(const char *host, u_short port)
2418{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002419 u_int i;
2420 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002421
Darren Tucker47eede72005-03-14 23:08:12 +11002422 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002423 Channel *c = channels[i];
2424
2425 if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
2426 strncmp(c->path, host, sizeof(c->path)) == 0 &&
Darren Tuckerfc959702004-07-17 16:12:08 +10002427 c->listening_port == port) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002428 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002429 channel_free(c);
2430 found = 1;
2431 }
2432 }
2433
2434 return (found);
2435}
2436
Damien Millerb16461c2002-01-22 23:29:22 +11002437/* protocol local port fwd, used by ssh (and sshd in v1) */
2438int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002439channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002440 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2441{
2442 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002443 listen_host, listen_port, host_to_connect, port_to_connect,
2444 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002445}
2446
2447/* protocol v2 remote port fwd, used by sshd */
2448int
2449channel_setup_remote_fwd_listener(const char *listen_address,
2450 u_short listen_port, int gateway_ports)
2451{
2452 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2453 listen_address, listen_port, NULL, 0, gateway_ports);
2454}
2455
Damien Miller5428f641999-11-25 11:54:57 +11002456/*
2457 * Initiate forwarding of connections to port "port" on remote host through
2458 * the secure channel to host:port from local side.
2459 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002460
Damien Miller4af51302000-04-16 11:18:38 +10002461void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002462channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002463 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002464{
Damien Millerdff50992002-01-22 23:16:32 +11002465 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002466
Damien Miller95def091999-11-25 00:26:21 +11002467 /* Record locally that connection to this host/port is permitted. */
2468 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2469 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002470
Damien Miller95def091999-11-25 00:26:21 +11002471 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002472 if (compat20) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11002473 const char *address_to_bind;
2474 if (listen_host == NULL)
2475 address_to_bind = "localhost";
2476 else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0)
2477 address_to_bind = "";
2478 else
2479 address_to_bind = listen_host;
2480
Damien Miller33b13562000-04-04 14:38:59 +10002481 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2482 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002483 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002484 packet_put_cstring(address_to_bind);
2485 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002486 packet_send();
2487 packet_write_wait();
2488 /* Assume that server accepts the request */
2489 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002490 } else {
2491 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002492 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002493 packet_put_cstring(host_to_connect);
2494 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002495 packet_send();
2496 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002497
2498 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002499 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002500 switch (type) {
2501 case SSH_SMSG_SUCCESS:
2502 success = 1;
2503 break;
2504 case SSH_SMSG_FAILURE:
Damien Miller996acd22003-04-09 20:59:48 +10002505 logit("Warning: Server denied remote port forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11002506 break;
2507 default:
2508 /* Unknown packet */
2509 packet_disconnect("Protocol error for port forward request:"
2510 "received packet type %d.", type);
2511 }
2512 }
2513 if (success) {
2514 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2515 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2516 permitted_opens[num_permitted_opens].listen_port = listen_port;
2517 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002518 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002519}
2520
Damien Miller5428f641999-11-25 11:54:57 +11002521/*
Darren Tuckerfc959702004-07-17 16:12:08 +10002522 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10002523 * local side.
2524 */
Darren Tuckere7066df2004-05-24 10:18:05 +10002525void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002526channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10002527{
2528 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10002529
2530 if (!compat20)
2531 return;
2532
2533 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10002534 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10002535 permitted_opens[i].listen_port == port)
2536 break;
2537 }
2538 if (i >= num_permitted_opens) {
2539 debug("%s: requested forward not found", __func__);
2540 return;
2541 }
2542 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2543 packet_put_cstring("cancel-tcpip-forward");
2544 packet_put_char(0);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002545 packet_put_cstring(host == NULL ? "" : host);
Darren Tuckere7066df2004-05-24 10:18:05 +10002546 packet_put_int(port);
2547 packet_send();
2548
2549 permitted_opens[i].listen_port = 0;
2550 permitted_opens[i].port_to_connect = 0;
Damien Miller0a0176e2005-11-05 15:07:59 +11002551 xfree(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10002552 permitted_opens[i].host_to_connect = NULL;
2553}
2554
2555/*
Damien Miller5428f641999-11-25 11:54:57 +11002556 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2557 * listening for the port, and sends back a success reply (or disconnect
2558 * message if there was an error). This never returns if there was an error.
2559 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002560
Damien Miller4af51302000-04-16 11:18:38 +10002561void
Damien Millere247cc42000-05-07 12:03:14 +10002562channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002563{
Damien Milleraae6c611999-12-06 11:47:28 +11002564 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002565 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002566
Damien Miller95def091999-11-25 00:26:21 +11002567 /* Get arguments from the packet. */
2568 port = packet_get_int();
2569 hostname = packet_get_string(NULL);
2570 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002571
Damien Millerbac2d8a2000-09-05 16:13:06 +11002572#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002573 /*
2574 * Check that an unprivileged user is not trying to forward a
2575 * privileged port.
2576 */
Damien Miller95def091999-11-25 00:26:21 +11002577 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10002578 packet_disconnect(
2579 "Requested forwarding of port %d but user is not root.",
2580 port);
2581 if (host_port == 0)
2582 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11002583#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10002584
Damien Miller0bc1bd82000-11-13 22:57:25 +11002585 /* Initiate forwarding */
Damien Millerf91ee4c2005-03-01 21:24:33 +11002586 channel_setup_local_fwd_listener(NULL, port, hostname,
2587 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002588
2589 /* Free the argument string. */
2590 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002591}
2592
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002593/*
2594 * Permits opening to any host/port if permitted_opens[] is empty. This is
2595 * usually called by the server, because the user could connect to any port
2596 * anyway, and the server has no way to know but to trust the client anyway.
2597 */
2598void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002599channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002600{
2601 if (num_permitted_opens == 0)
2602 all_opens_permitted = 1;
2603}
2604
Ben Lindstroma3700052001-04-05 23:26:32 +00002605void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002606channel_add_permitted_opens(char *host, int port)
2607{
2608 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2609 fatal("channel_request_remote_forwarding: too many forwards");
2610 debug("allow port forwarding to host %s port %d", host, port);
2611
2612 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2613 permitted_opens[num_permitted_opens].port_to_connect = port;
2614 num_permitted_opens++;
2615
2616 all_opens_permitted = 0;
2617}
2618
Ben Lindstroma3700052001-04-05 23:26:32 +00002619void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002620channel_clear_permitted_opens(void)
2621{
2622 int i;
2623
2624 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002625 if (permitted_opens[i].host_to_connect != NULL)
2626 xfree(permitted_opens[i].host_to_connect);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002627 num_permitted_opens = 0;
2628
2629}
2630
2631
2632/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002633static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002634connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002635{
Damien Miller34132e52000-01-14 15:45:46 +11002636 struct addrinfo hints, *ai, *aitop;
2637 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2638 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002639 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002640
Damien Miller34132e52000-01-14 15:45:46 +11002641 memset(&hints, 0, sizeof(hints));
2642 hints.ai_family = IPv4or6;
2643 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002644 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002645 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002646 error("connect_to %.100s: unknown host (%s)", host,
2647 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002648 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002649 }
Damien Miller34132e52000-01-14 15:45:46 +11002650 for (ai = aitop; ai; ai = ai->ai_next) {
2651 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2652 continue;
2653 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2654 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002655 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002656 continue;
2657 }
Damien Miller2372ace2003-05-14 13:42:23 +10002658 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002659 if (sock < 0) {
Damien Millerb46b9f32003-01-10 21:45:12 +11002660 if (ai->ai_next == NULL)
2661 error("socket: %.100s", strerror(errno));
2662 else
2663 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002664 continue;
2665 }
Damien Miller232711f2004-06-15 10:35:30 +10002666 if (set_nonblock(sock) == -1)
2667 fatal("%s: set_nonblock(%d)", __func__, sock);
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002668 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2669 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002670 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002671 strerror(errno));
2672 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002673 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002674 }
2675 break; /* success */
2676
2677 }
2678 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002679 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002680 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002681 return -1;
2682 }
2683 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002684 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002685 return sock;
2686}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002687
Damien Miller0bc1bd82000-11-13 22:57:25 +11002688int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002689channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002690{
2691 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002692
Damien Miller0bc1bd82000-11-13 22:57:25 +11002693 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002694 if (permitted_opens[i].host_to_connect != NULL &&
2695 permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002696 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002697 permitted_opens[i].host_to_connect,
2698 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002699 error("WARNING: Server requests forwarding for unknown listen_port %d",
2700 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002701 return -1;
2702}
Damien Millerb38eff82000-04-01 11:09:21 +10002703
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002704/* Check if connecting to that port is permitted and connect. */
2705int
2706channel_connect_to(const char *host, u_short port)
2707{
2708 int i, permit;
2709
2710 permit = all_opens_permitted;
2711 if (!permit) {
2712 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002713 if (permitted_opens[i].host_to_connect != NULL &&
2714 permitted_opens[i].port_to_connect == port &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002715 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2716 permit = 1;
2717
2718 }
2719 if (!permit) {
Damien Miller996acd22003-04-09 20:59:48 +10002720 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002721 "but the request was denied.", host, port);
2722 return -1;
2723 }
2724 return connect_to(host, port);
2725}
2726
Damien Miller0e220db2004-06-15 10:34:08 +10002727void
2728channel_send_window_changes(void)
2729{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002730 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10002731 struct winsize ws;
2732
2733 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11002734 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10002735 channels[i]->type != SSH_CHANNEL_OPEN)
2736 continue;
2737 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
2738 continue;
2739 channel_request_start(i, "window-change", 0);
Damien Miller71a73672006-03-26 14:04:36 +11002740 packet_put_int((u_int)ws.ws_col);
2741 packet_put_int((u_int)ws.ws_row);
2742 packet_put_int((u_int)ws.ws_xpixel);
2743 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10002744 packet_send();
2745 }
2746}
2747
Ben Lindstrome9c99912001-06-09 00:41:05 +00002748/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002749
Damien Miller5428f641999-11-25 11:54:57 +11002750/*
2751 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002752 * Returns 0 and a suitable display number for the DISPLAY variable
2753 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002754 */
Kevin Steves366298c2001-12-19 17:58:01 +00002755int
Damien Miller95c249f2002-02-05 12:11:34 +11002756x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10002757 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002758{
Damien Millere7378562001-12-21 14:58:35 +11002759 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002760 int display_number, sock;
2761 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002762 struct addrinfo hints, *ai, *aitop;
2763 char strport[NI_MAXSERV];
2764 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002765
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002766 if (chanids == NULL)
2767 return -1;
2768
Damien Millera34a28b1999-12-14 10:47:15 +11002769 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002770 display_number < MAX_DISPLAYS;
2771 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002772 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002773 memset(&hints, 0, sizeof(hints));
2774 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002775 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002776 hints.ai_socktype = SOCK_STREAM;
2777 snprintf(strport, sizeof strport, "%d", port);
2778 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2779 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002780 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002781 }
Damien Miller34132e52000-01-14 15:45:46 +11002782 for (ai = aitop; ai; ai = ai->ai_next) {
2783 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2784 continue;
Damien Miller2372ace2003-05-14 13:42:23 +10002785 sock = socket(ai->ai_family, ai->ai_socktype,
2786 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002787 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002788 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002789 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10002790 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00002791 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002792 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002793 debug("x11_create_display_inet: Socket family %d not supported",
2794 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002795 continue;
2796 }
Damien Miller34132e52000-01-14 15:45:46 +11002797 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002798#ifdef IPV6_V6ONLY
2799 if (ai->ai_family == AF_INET6) {
2800 int on = 1;
2801 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2802 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2803 }
2804#endif
Damien Miller5e7fd072005-11-05 14:53:39 +11002805 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11002806 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002807 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002808 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002809
2810 if (ai->ai_next)
2811 continue;
2812
Damien Miller34132e52000-01-14 15:45:46 +11002813 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002814 close(socks[n]);
2815 }
2816 num_socks = 0;
2817 break;
2818 }
2819 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002820#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002821 if (num_socks == NUM_SOCKS)
2822 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002823#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002824 if (x11_use_localhost) {
2825 if (num_socks == NUM_SOCKS)
2826 break;
2827 } else {
2828 break;
2829 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002830#endif
Damien Miller95def091999-11-25 00:26:21 +11002831 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002832 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002833 if (num_socks > 0)
2834 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002835 }
Damien Miller95def091999-11-25 00:26:21 +11002836 if (display_number >= MAX_DISPLAYS) {
2837 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002838 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002839 }
Damien Miller95def091999-11-25 00:26:21 +11002840 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002841 for (n = 0; n < num_socks; n++) {
2842 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11002843 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002844 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002845 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002846 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002847 }
Damien Miller95def091999-11-25 00:26:21 +11002848 }
Damien Miller34132e52000-01-14 15:45:46 +11002849
Damien Miller34132e52000-01-14 15:45:46 +11002850 /* Allocate a channel for each socket. */
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002851 *chanids = xmalloc(sizeof(**chanids) * (num_socks + 1));
Damien Miller34132e52000-01-14 15:45:46 +11002852 for (n = 0; n < num_socks; n++) {
2853 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002854 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002855 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2856 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002857 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11002858 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002859 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11002860 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002861 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002862
Kevin Steves366298c2001-12-19 17:58:01 +00002863 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002864 *display_numberp = display_number;
2865 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002866}
2867
Ben Lindstrombba81212001-06-25 05:01:22 +00002868static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002869connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002870{
Damien Miller95def091999-11-25 00:26:21 +11002871 int sock;
2872 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002873
Damien Miller3afe3752001-12-21 12:39:51 +11002874 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2875 if (sock < 0)
2876 error("socket: %.100s", strerror(errno));
2877 memset(&addr, 0, sizeof(addr));
2878 addr.sun_family = AF_UNIX;
2879 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
Damien Miller90967402006-03-26 14:07:26 +11002880 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
Damien Miller3afe3752001-12-21 12:39:51 +11002881 return sock;
2882 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002883 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2884 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002885}
2886
Damien Millerbd483e72000-04-30 10:00:53 +10002887int
2888x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002889{
Damien Miller398e1cf2002-02-05 11:52:13 +11002890 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002891 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002892 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002893 struct addrinfo hints, *ai, *aitop;
2894 char strport[NI_MAXSERV];
2895 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002896
Damien Miller95def091999-11-25 00:26:21 +11002897 /* Try to open a socket for the local X server. */
2898 display = getenv("DISPLAY");
2899 if (!display) {
2900 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002901 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002902 }
Damien Miller5428f641999-11-25 11:54:57 +11002903 /*
2904 * Now we decode the value of the DISPLAY variable and make a
2905 * connection to the real X server.
2906 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002907
Damien Miller5428f641999-11-25 11:54:57 +11002908 /*
2909 * Check if it is a unix domain socket. Unix domain displays are in
2910 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2911 */
Damien Miller95def091999-11-25 00:26:21 +11002912 if (strncmp(display, "unix:", 5) == 0 ||
2913 display[0] == ':') {
2914 /* Connect to the unix domain socket. */
2915 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2916 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002917 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002918 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002919 }
2920 /* Create a socket. */
2921 sock = connect_local_xsocket(display_number);
2922 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002923 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002924
2925 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002926 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002927 }
Damien Miller5428f641999-11-25 11:54:57 +11002928 /*
2929 * Connect to an inet socket. The DISPLAY value is supposedly
2930 * hostname:d[.s], where hostname may also be numeric IP address.
2931 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00002932 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11002933 cp = strchr(buf, ':');
2934 if (!cp) {
2935 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002936 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002937 }
Damien Miller95def091999-11-25 00:26:21 +11002938 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002939 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002940 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2941 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11002942 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002943 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002944 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002945
Damien Miller34132e52000-01-14 15:45:46 +11002946 /* Look up the host address */
2947 memset(&hints, 0, sizeof(hints));
2948 hints.ai_family = IPv4or6;
2949 hints.ai_socktype = SOCK_STREAM;
2950 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2951 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2952 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002953 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002954 }
Damien Miller34132e52000-01-14 15:45:46 +11002955 for (ai = aitop; ai; ai = ai->ai_next) {
2956 /* Create a socket. */
Damien Miller2372ace2003-05-14 13:42:23 +10002957 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002958 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002959 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002960 continue;
2961 }
2962 /* Connect it to the display. */
2963 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002964 debug2("connect %.100s port %d: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10002965 6000 + display_number, strerror(errno));
2966 close(sock);
2967 continue;
2968 }
2969 /* Success */
2970 break;
Damien Miller34132e52000-01-14 15:45:46 +11002971 }
Damien Miller34132e52000-01-14 15:45:46 +11002972 freeaddrinfo(aitop);
2973 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002974 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002975 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002976 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002977 }
Damien Miller398e1cf2002-02-05 11:52:13 +11002978 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10002979 return sock;
2980}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002981
Damien Millerbd483e72000-04-30 10:00:53 +10002982/*
2983 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2984 * the remote channel number. We should do whatever we want, and respond
2985 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2986 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002987
Damien Millerbd483e72000-04-30 10:00:53 +10002988void
Damien Miller630d6f42002-01-22 23:17:30 +11002989x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002990{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002991 Channel *c = NULL;
2992 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002993 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002994
2995 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002996
2997 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002998
2999 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003000 remote_host = packet_get_string(NULL);
3001 } else {
3002 remote_host = xstrdup("unknown (remote did not supply name)");
3003 }
Damien Miller48b03fc2002-01-22 23:11:40 +11003004 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10003005
3006 /* Obtain a connection to the real X display. */
3007 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003008 if (sock != -1) {
3009 /* Allocate a channel for this connection. */
3010 c = channel_new("connected x11 socket",
3011 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3012 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11003013 c->remote_id = remote_id;
3014 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003015 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003016 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003017 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10003018 /* Send refusal to the remote host. */
3019 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003020 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10003021 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10003022 /* Send a confirmation to the remote host. */
3023 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003024 packet_put_int(remote_id);
3025 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10003026 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003027 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003028}
3029
Damien Miller69b69aa2000-10-28 14:19:58 +11003030/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
3031void
Damien Miller630d6f42002-01-22 23:17:30 +11003032deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11003033{
3034 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00003035
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00003036 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11003037 case SSH_SMSG_AGENT_OPEN:
3038 error("Warning: ssh server tried agent forwarding.");
3039 break;
3040 case SSH_SMSG_X11_OPEN:
3041 error("Warning: ssh server tried X11 forwarding.");
3042 break;
3043 default:
Damien Miller630d6f42002-01-22 23:17:30 +11003044 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11003045 break;
3046 }
Damien Miller5eb137c2005-12-31 16:19:53 +11003047 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11003048 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3049 packet_put_int(rchan);
3050 packet_send();
3051}
3052
Damien Miller5428f641999-11-25 11:54:57 +11003053/*
3054 * Requests forwarding of X11 connections, generates fake authentication
3055 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00003056 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11003057 */
Damien Miller4af51302000-04-16 11:18:38 +10003058void
Damien Miller17e7ed02005-06-17 12:54:33 +10003059x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Millerbd483e72000-04-30 10:00:53 +10003060 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003061{
Ben Lindstrom46c16222000-12-22 01:43:59 +00003062 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10003063 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11003064 char *new_data;
3065 int screen_number;
3066 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10003067 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003068
Damien Millerf92c0792005-07-06 09:45:26 +10003069 if (x11_saved_display == NULL)
3070 x11_saved_display = xstrdup(disp);
3071 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10003072 error("x11_request_forwarding_with_spoofing: different "
3073 "$DISPLAY already forwarded");
3074 return;
3075 }
3076
Damien Miller17e7ed02005-06-17 12:54:33 +10003077 cp = disp;
3078 if (disp)
3079 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11003080 if (cp)
3081 cp = strchr(cp, '.');
3082 if (cp)
3083 screen_number = atoi(cp + 1);
3084 else
3085 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003086
Damien Miller13390022005-07-06 09:44:19 +10003087 if (x11_saved_proto == NULL) {
3088 /* Save protocol name. */
3089 x11_saved_proto = xstrdup(proto);
3090 /*
Damien Miller46d38de2005-07-17 17:02:09 +10003091 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10003092 * of the same length.
3093 */
3094 x11_saved_data = xmalloc(data_len);
3095 x11_fake_data = xmalloc(data_len);
3096 for (i = 0; i < data_len; i++) {
3097 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3098 fatal("x11_request_forwarding: bad "
3099 "authentication data: %.100s", data);
3100 if (i % 4 == 0)
3101 rnd = arc4random();
3102 x11_saved_data[i] = value;
3103 x11_fake_data[i] = rnd & 0xff;
3104 rnd >>= 8;
3105 }
3106 x11_saved_data_len = data_len;
3107 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003108 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003109
Damien Miller95def091999-11-25 00:26:21 +11003110 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003111 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003112
Damien Miller95def091999-11-25 00:26:21 +11003113 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003114 if (compat20) {
3115 channel_request_start(client_session_id, "x11-req", 0);
3116 packet_put_char(0); /* XXX bool single connection */
3117 } else {
3118 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3119 }
3120 packet_put_cstring(proto);
3121 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003122 packet_put_int(screen_number);
3123 packet_send();
3124 packet_write_wait();
3125 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003126}
3127
Ben Lindstrome9c99912001-06-09 00:41:05 +00003128
3129/* -- agent forwarding */
3130
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003131/* Sends a message to the server to request authentication fd forwarding. */
3132
Damien Miller4af51302000-04-16 11:18:38 +10003133void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003134auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003135{
Damien Miller95def091999-11-25 00:26:21 +11003136 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3137 packet_send();
3138 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003139}