blob: efb04d65537dedf07d0b229f1e60a563be555f49 [file] [log] [blame]
Darren Tuckerf7288d72009-06-21 18:12:20 +10001/* $OpenBSD: channels.c,v 1.296 2009/05/25 06:48:00 andreas Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * This file contains functions for generic socket connection forwarding.
7 * There is also code for initiating connection forwarding for X11 connections,
8 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10009 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
Damien Miller33b13562000-04-04 14:38:59 +100016 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110017 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 * Copyright (c) 1999 Dug Song. All rights reserved.
19 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110040 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110043
Damien Miller574c41f2006-03-15 11:40:10 +110044#include <sys/types.h>
Damien Millerd7834352006-08-05 12:39:39 +100045#include <sys/ioctl.h>
Damien Miller574c41f2006-03-15 11:40:10 +110046#include <sys/un.h>
Damien Millerefc04e72006-07-10 20:26:27 +100047#include <sys/socket.h>
Damien Miller9aec9192006-08-05 10:57:45 +100048#ifdef HAVE_SYS_TIME_H
49# include <sys/time.h>
50#endif
Damien Millerefc04e72006-07-10 20:26:27 +100051
52#include <netinet/in.h>
53#include <arpa/inet.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110054
Darren Tucker39972492006-07-12 22:22:46 +100055#include <errno.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100056#include <netdb.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100057#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100058#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100059#include <string.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110060#include <termios.h>
Damien Millere6b3b612006-07-24 14:01:23 +100061#include <unistd.h>
Damien Millerd7834352006-08-05 12:39:39 +100062#include <stdarg.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100063
Damien Millerb84886b2008-05-19 15:05:07 +100064#include "openbsd-compat/sys-queue.h"
Damien Millerd7834352006-08-05 12:39:39 +100065#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100066#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000067#include "ssh1.h"
68#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100069#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000070#include "log.h"
71#include "misc.h"
Damien Millerd7834352006-08-05 12:39:39 +100072#include "buffer.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100073#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100074#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000075#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100076#include "key.h"
77#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110078#include "pathnames.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079
Ben Lindstrome9c99912001-06-09 00:41:05 +000080/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081
Damien Miller5428f641999-11-25 11:54:57 +110082/*
83 * Pointer to an array containing all allocated channels. The array is
84 * dynamically extended as needed.
85 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000086static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100087
Damien Miller5428f641999-11-25 11:54:57 +110088/*
89 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000090 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110091 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100092static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100093
Damien Miller5428f641999-11-25 11:54:57 +110094/*
95 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000096 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110097 */
Damien Miller5e953212001-01-30 09:14:00 +110098static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100099
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100
Ben Lindstrome9c99912001-06-09 00:41:05 +0000101/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000102
Damien Miller5428f641999-11-25 11:54:57 +1100103/*
104 * Data structure for storing which hosts are permitted for forward requests.
105 * The local sides of any remote forwards are stored in this array to prevent
106 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
107 * network (which might be behind a firewall).
108 */
Damien Miller95def091999-11-25 00:26:21 +1100109typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +1000110 char *host_to_connect; /* Connect to 'host'. */
111 u_short port_to_connect; /* Connect to 'port'. */
112 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000113} ForwardPermission;
114
Damien Miller9b439df2006-07-24 14:04:00 +1000115/* List of all permitted host/port pairs to connect by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000116static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +0000117
Damien Miller9b439df2006-07-24 14:04:00 +1000118/* List of all permitted host/port pairs to connect by the admin. */
119static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
120
121/* Number of permitted host/port pairs in the array permitted by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000122static int num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +1000123
124/* Number of permitted host/port pair in the array permitted by the admin. */
125static int num_adm_permitted_opens = 0;
126
Damien Miller5428f641999-11-25 11:54:57 +1100127/*
128 * If this is true, all opens are permitted. This is the case on the server
129 * on which we have to trust the client anyway, and the user could do
130 * anything after logging in anyway.
131 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000132static int all_opens_permitted = 0;
133
Ben Lindstrome9c99912001-06-09 00:41:05 +0000134
135/* -- X11 forwarding */
136
137/* Maximum number of fake X11 displays to try. */
138#define MAX_DISPLAYS 1000
139
Damien Miller13390022005-07-06 09:44:19 +1000140/* Saved X11 local (client) display. */
141static char *x11_saved_display = NULL;
142
Ben Lindstrome9c99912001-06-09 00:41:05 +0000143/* Saved X11 authentication protocol name. */
144static char *x11_saved_proto = NULL;
145
146/* Saved X11 authentication data. This is the real data. */
147static char *x11_saved_data = NULL;
148static u_int x11_saved_data_len = 0;
149
150/*
151 * Fake X11 authentication data. This is what the server will be sending us;
152 * we should replace any occurrences of this by the real data.
153 */
Damien Miller4ae97f12006-03-26 14:08:10 +1100154static u_char *x11_fake_data = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000155static u_int x11_fake_data_len;
156
157
158/* -- agent forwarding */
159
160#define NUM_SOCKS 10
161
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000162/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000163static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000164
Ben Lindstrome9c99912001-06-09 00:41:05 +0000165/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000166static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000167
Damien Millerbd740252008-05-19 15:37:09 +1000168/* non-blocking connect helpers */
169static int connect_next(struct channel_connect *);
170static void channel_connect_ctx_free(struct channel_connect *);
171
Ben Lindstrome9c99912001-06-09 00:41:05 +0000172/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000173
174Channel *
Damien Millerd47c62a2005-12-13 19:33:57 +1100175channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000176{
177 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000178
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000179 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100180 logit("channel_by_id: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000181 return NULL;
182 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000183 c = channels[id];
184 if (c == NULL) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100185 logit("channel_by_id: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000186 return NULL;
187 }
188 return c;
189}
190
Damien Miller5428f641999-11-25 11:54:57 +1100191/*
Damien Millerd47c62a2005-12-13 19:33:57 +1100192 * Returns the channel if it is allowed to receive protocol messages.
193 * Private channels, like listening sockets, may not receive messages.
194 */
195Channel *
196channel_lookup(int id)
197{
198 Channel *c;
199
200 if ((c = channel_by_id(id)) == NULL)
201 return (NULL);
202
Damien Millerd62f2ca2006-03-26 13:57:41 +1100203 switch (c->type) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100204 case SSH_CHANNEL_X11_OPEN:
205 case SSH_CHANNEL_LARVAL:
206 case SSH_CHANNEL_CONNECTING:
207 case SSH_CHANNEL_DYNAMIC:
208 case SSH_CHANNEL_OPENING:
209 case SSH_CHANNEL_OPEN:
210 case SSH_CHANNEL_INPUT_DRAINING:
211 case SSH_CHANNEL_OUTPUT_DRAINING:
212 return (c);
Damien Millerd47c62a2005-12-13 19:33:57 +1100213 }
214 logit("Non-public channel %d, type %d.", id, c->type);
215 return (NULL);
216}
217
218/*
Damien Millere247cc42000-05-07 12:03:14 +1000219 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000220 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100221 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000222static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100223channel_register_fds(Channel *c, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000224 int extusage, int nonblock, int is_tty)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000225{
Damien Miller95def091999-11-25 00:26:21 +1100226 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100227 channel_max_fd = MAX(channel_max_fd, rfd);
228 channel_max_fd = MAX(channel_max_fd, wfd);
229 channel_max_fd = MAX(channel_max_fd, efd);
230
Damien Miller5428f641999-11-25 11:54:57 +1100231 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000232
Damien Miller6f83b8e2000-05-02 09:23:45 +1000233 c->rfd = rfd;
234 c->wfd = wfd;
235 c->sock = (rfd == wfd) ? rfd : -1;
Damien Miller0e220db2004-06-15 10:34:08 +1000236 c->ctl_fd = -1; /* XXX: set elsewhere */
Damien Miller6f83b8e2000-05-02 09:23:45 +1000237 c->efd = efd;
238 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100239
Darren Tuckered3cdc02008-06-16 23:29:18 +1000240 if ((c->isatty = is_tty) != 0)
Damien Millerfbdeece2003-09-02 22:52:31 +1000241 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Darren Tucker1a48aec2008-06-16 23:35:56 +1000242 c->wfd_isatty = is_tty || isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100243
Damien Miller69b69aa2000-10-28 14:19:58 +1100244 /* enable nonblocking mode */
245 if (nonblock) {
246 if (rfd != -1)
247 set_nonblock(rfd);
248 if (wfd != -1)
249 set_nonblock(wfd);
250 if (efd != -1)
251 set_nonblock(efd);
252 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000253}
254
255/*
256 * Allocate a new channel object and set its type and socket. This will cause
257 * remote_name to be freed.
258 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000259Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000260channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000261 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000262{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000263 int found;
264 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000265 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000266
Damien Miller95def091999-11-25 00:26:21 +1100267 /* Do initial allocation if this is the first call. */
268 if (channels_alloc == 0) {
269 channels_alloc = 10;
Damien Miller07d86be2006-03-26 14:19:21 +1100270 channels = xcalloc(channels_alloc, sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100271 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000272 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100273 }
274 /* Try to find a free slot where to put the new channel. */
275 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000276 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100277 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000278 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100279 break;
280 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000281 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100282 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100283 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000284 if (channels_alloc > 10000)
285 fatal("channel_new: internal error: channels_alloc %d "
286 "too big.", channels_alloc);
Damien Miller36812092006-03-26 14:22:47 +1100287 channels = xrealloc(channels, channels_alloc + 10,
288 sizeof(Channel *));
Damien Miller5efcecc2003-09-17 07:31:14 +1000289 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100290 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100291 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000292 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100293 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000294 /* Initialize and return new channel. */
Damien Miller07d86be2006-03-26 14:19:21 +1100295 c = channels[found] = xcalloc(1, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100296 buffer_init(&c->input);
297 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000298 buffer_init(&c->extended);
Damien Millera1c1b6c2009-01-28 16:29:49 +1100299 c->path = NULL;
Damien Miller5144df92002-01-22 23:28:45 +1100300 c->ostate = CHAN_OUTPUT_OPEN;
301 c->istate = CHAN_INPUT_OPEN;
302 c->flags = 0;
Damien Millerd310d512008-06-16 07:59:23 +1000303 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0);
Damien Miller95def091999-11-25 00:26:21 +1100304 c->self = found;
305 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000306 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000307 c->local_window = window;
308 c->local_window_max = window;
309 c->local_consumed = 0;
310 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100311 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000312 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000313 c->remote_window = 0;
314 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000315 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100316 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000317 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100318 c->detach_close = 0;
Damien Millerb84886b2008-05-19 15:05:07 +1000319 c->open_confirm = NULL;
320 c->open_confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000321 c->input_filter = NULL;
Damien Miller077b2382005-12-31 16:22:32 +1100322 c->output_filter = NULL;
Darren Tucker84c56f52008-06-13 04:55:46 +1000323 c->filter_ctx = NULL;
324 c->filter_cleanup = NULL;
Damien Millerb84886b2008-05-19 15:05:07 +1000325 TAILQ_INIT(&c->status_confirms);
Damien Miller95def091999-11-25 00:26:21 +1100326 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000327 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000328}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000329
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000330static int
331channel_find_maxfd(void)
332{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000333 u_int i;
334 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000335 Channel *c;
336
337 for (i = 0; i < channels_alloc; i++) {
338 c = channels[i];
339 if (c != NULL) {
340 max = MAX(max, c->rfd);
341 max = MAX(max, c->wfd);
342 max = MAX(max, c->efd);
343 }
344 }
345 return max;
346}
347
348int
349channel_close_fd(int *fdp)
350{
351 int ret = 0, fd = *fdp;
352
353 if (fd != -1) {
354 ret = close(fd);
355 *fdp = -1;
356 if (fd == channel_max_fd)
357 channel_max_fd = channel_find_maxfd();
358 }
359 return ret;
360}
361
Damien Miller6f83b8e2000-05-02 09:23:45 +1000362/* Close all channel fd/socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000363static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000364channel_close_fds(Channel *c)
365{
Damien Miller0e220db2004-06-15 10:34:08 +1000366 debug3("channel %d: close_fds r %d w %d e %d c %d",
367 c->self, c->rfd, c->wfd, c->efd, c->ctl_fd);
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000368
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000369 channel_close_fd(&c->sock);
Damien Miller0e220db2004-06-15 10:34:08 +1000370 channel_close_fd(&c->ctl_fd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000371 channel_close_fd(&c->rfd);
372 channel_close_fd(&c->wfd);
373 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000374}
375
376/* Free the channel and close its fd/socket. */
Damien Miller4af51302000-04-16 11:18:38 +1000377void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000378channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000379{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000380 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000381 u_int i, n;
Damien Millerb84886b2008-05-19 15:05:07 +1000382 struct channel_confirm *cc;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000383
384 for (n = 0, i = 0; i < channels_alloc; i++)
385 if (channels[i])
386 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000387 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000388 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000389
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000390 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000391 debug3("channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000392 xfree(s);
393
Damien Miller6f83b8e2000-05-02 09:23:45 +1000394 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000395 shutdown(c->sock, SHUT_RDWR);
Damien Miller0e220db2004-06-15 10:34:08 +1000396 if (c->ctl_fd != -1)
397 shutdown(c->ctl_fd, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000398 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000399 buffer_free(&c->input);
400 buffer_free(&c->output);
401 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000402 if (c->remote_name) {
403 xfree(c->remote_name);
404 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100405 }
Damien Millera1c1b6c2009-01-28 16:29:49 +1100406 if (c->path) {
407 xfree(c->path);
408 c->path = NULL;
409 }
Damien Millerb84886b2008-05-19 15:05:07 +1000410 while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
411 if (cc->abandon_cb != NULL)
412 cc->abandon_cb(c, cc->ctx);
413 TAILQ_REMOVE(&c->status_confirms, cc, entry);
414 bzero(cc, sizeof(*cc));
415 xfree(cc);
416 }
Darren Tucker84c56f52008-06-13 04:55:46 +1000417 if (c->filter_cleanup != NULL && c->filter_ctx != NULL)
418 c->filter_cleanup(c->self, c->filter_ctx);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000419 channels[c->self] = NULL;
420 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000421}
422
Ben Lindstrome9c99912001-06-09 00:41:05 +0000423void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000424channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000425{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000426 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000427
Ben Lindstrom601e4362001-06-21 03:19:23 +0000428 for (i = 0; i < channels_alloc; i++)
429 if (channels[i] != NULL)
430 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000431}
432
433/*
434 * Closes the sockets/fds of all channels. This is used to close extra file
435 * descriptors after a fork.
436 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000437void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000438channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000439{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000440 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000441
442 for (i = 0; i < channels_alloc; i++)
443 if (channels[i] != NULL)
444 channel_close_fds(channels[i]);
445}
446
447/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000448 * Stop listening to channels.
449 */
Ben Lindstrom809744e2001-07-04 05:26:06 +0000450void
451channel_stop_listening(void)
452{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000453 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000454 Channel *c;
455
456 for (i = 0; i < channels_alloc; i++) {
457 c = channels[i];
458 if (c != NULL) {
459 switch (c->type) {
460 case SSH_CHANNEL_AUTH_SOCKET:
461 case SSH_CHANNEL_PORT_LISTENER:
462 case SSH_CHANNEL_RPORT_LISTENER:
463 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000464 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000465 channel_free(c);
466 break;
467 }
468 }
469 }
470}
471
472/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000473 * Returns true if no channel has too much buffered data, and false if one or
474 * more channel is overfull.
475 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000476int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000477channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000478{
479 u_int i;
480 Channel *c;
481
482 for (i = 0; i < channels_alloc; i++) {
483 c = channels[i];
484 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000485#if 0
486 if (!compat20 &&
487 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100488 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000489 c->self, buffer_len(&c->input));
490 return 0;
491 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000492#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000493 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000494 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000495 c->self, buffer_len(&c->output),
496 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000497 return 0;
498 }
499 }
500 }
501 return 1;
502}
503
504/* Returns true if any channel is still open. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000505int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000506channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000507{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000508 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000509 Channel *c;
510
511 for (i = 0; i < channels_alloc; i++) {
512 c = channels[i];
513 if (c == NULL)
514 continue;
515 switch (c->type) {
516 case SSH_CHANNEL_X11_LISTENER:
517 case SSH_CHANNEL_PORT_LISTENER:
518 case SSH_CHANNEL_RPORT_LISTENER:
519 case SSH_CHANNEL_CLOSED:
520 case SSH_CHANNEL_AUTH_SOCKET:
521 case SSH_CHANNEL_DYNAMIC:
522 case SSH_CHANNEL_CONNECTING:
523 case SSH_CHANNEL_ZOMBIE:
524 continue;
525 case SSH_CHANNEL_LARVAL:
526 if (!compat20)
527 fatal("cannot happen: SSH_CHANNEL_LARVAL");
528 continue;
529 case SSH_CHANNEL_OPENING:
530 case SSH_CHANNEL_OPEN:
531 case SSH_CHANNEL_X11_OPEN:
532 return 1;
533 case SSH_CHANNEL_INPUT_DRAINING:
534 case SSH_CHANNEL_OUTPUT_DRAINING:
535 if (!compat13)
536 fatal("cannot happen: OUT_DRAIN");
537 return 1;
538 default:
539 fatal("channel_still_open: bad channel type %d", c->type);
540 /* NOTREACHED */
541 }
542 }
543 return 0;
544}
545
546/* Returns the id of an open channel suitable for keepaliving */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000547int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000548channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000549{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000550 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000551 Channel *c;
552
553 for (i = 0; i < channels_alloc; i++) {
554 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000555 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000556 continue;
557 switch (c->type) {
558 case SSH_CHANNEL_CLOSED:
559 case SSH_CHANNEL_DYNAMIC:
560 case SSH_CHANNEL_X11_LISTENER:
561 case SSH_CHANNEL_PORT_LISTENER:
562 case SSH_CHANNEL_RPORT_LISTENER:
563 case SSH_CHANNEL_OPENING:
564 case SSH_CHANNEL_CONNECTING:
565 case SSH_CHANNEL_ZOMBIE:
566 continue;
567 case SSH_CHANNEL_LARVAL:
568 case SSH_CHANNEL_AUTH_SOCKET:
569 case SSH_CHANNEL_OPEN:
570 case SSH_CHANNEL_X11_OPEN:
571 return i;
572 case SSH_CHANNEL_INPUT_DRAINING:
573 case SSH_CHANNEL_OUTPUT_DRAINING:
574 if (!compat13)
575 fatal("cannot happen: OUT_DRAIN");
576 return i;
577 default:
578 fatal("channel_find_open: bad channel type %d", c->type);
579 /* NOTREACHED */
580 }
581 }
582 return -1;
583}
584
585
586/*
587 * Returns a message describing the currently open forwarded connections,
588 * suitable for sending to the client. The message contains crlf pairs for
589 * newlines.
590 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000591char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000592channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000593{
594 Buffer buffer;
595 Channel *c;
596 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000597 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000598
599 buffer_init(&buffer);
600 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
601 buffer_append(&buffer, buf, strlen(buf));
602 for (i = 0; i < channels_alloc; i++) {
603 c = channels[i];
604 if (c == NULL)
605 continue;
606 switch (c->type) {
607 case SSH_CHANNEL_X11_LISTENER:
608 case SSH_CHANNEL_PORT_LISTENER:
609 case SSH_CHANNEL_RPORT_LISTENER:
610 case SSH_CHANNEL_CLOSED:
611 case SSH_CHANNEL_AUTH_SOCKET:
612 case SSH_CHANNEL_ZOMBIE:
613 continue;
614 case SSH_CHANNEL_LARVAL:
615 case SSH_CHANNEL_OPENING:
616 case SSH_CHANNEL_CONNECTING:
617 case SSH_CHANNEL_DYNAMIC:
618 case SSH_CHANNEL_OPEN:
619 case SSH_CHANNEL_X11_OPEN:
620 case SSH_CHANNEL_INPUT_DRAINING:
621 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000622 snprintf(buf, sizeof buf,
623 " #%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 +0000624 c->self, c->remote_name,
625 c->type, c->remote_id,
626 c->istate, buffer_len(&c->input),
627 c->ostate, buffer_len(&c->output),
Damien Miller0e220db2004-06-15 10:34:08 +1000628 c->rfd, c->wfd, c->ctl_fd);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000629 buffer_append(&buffer, buf, strlen(buf));
630 continue;
631 default:
632 fatal("channel_open_message: bad channel type %d", c->type);
633 /* NOTREACHED */
634 }
635 }
636 buffer_append(&buffer, "\0", 1);
637 cp = xstrdup(buffer_ptr(&buffer));
638 buffer_free(&buffer);
639 return cp;
640}
641
642void
643channel_send_open(int id)
644{
645 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000646
Ben Lindstrome9c99912001-06-09 00:41:05 +0000647 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000648 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000649 return;
650 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000651 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000652 packet_start(SSH2_MSG_CHANNEL_OPEN);
653 packet_put_cstring(c->ctype);
654 packet_put_int(c->self);
655 packet_put_int(c->local_window);
656 packet_put_int(c->local_maxpacket);
657 packet_send();
658}
659
660void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000661channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000662{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000663 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000664
Ben Lindstrome9c99912001-06-09 00:41:05 +0000665 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000666 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000667 return;
668 }
Damien Miller0e220db2004-06-15 10:34:08 +1000669 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000670 packet_start(SSH2_MSG_CHANNEL_REQUEST);
671 packet_put_int(c->remote_id);
672 packet_put_cstring(service);
673 packet_put_char(wantconfirm);
674}
Damien Miller4f7becb2006-03-26 14:10:14 +1100675
Ben Lindstrome9c99912001-06-09 00:41:05 +0000676void
Damien Millerb84886b2008-05-19 15:05:07 +1000677channel_register_status_confirm(int id, channel_confirm_cb *cb,
678 channel_confirm_abandon_cb *abandon_cb, void *ctx)
679{
680 struct channel_confirm *cc;
681 Channel *c;
682
683 if ((c = channel_lookup(id)) == NULL)
684 fatal("channel_register_expect: %d: bad id", id);
685
686 cc = xmalloc(sizeof(*cc));
687 cc->cb = cb;
688 cc->abandon_cb = abandon_cb;
689 cc->ctx = ctx;
690 TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry);
691}
692
693void
694channel_register_open_confirm(int id, channel_callback_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000695{
696 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000697
Ben Lindstrome9c99912001-06-09 00:41:05 +0000698 if (c == NULL) {
Damien Millera0094332008-11-03 19:26:35 +1100699 logit("channel_register_open_confirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000700 return;
701 }
Damien Millerb84886b2008-05-19 15:05:07 +1000702 c->open_confirm = fn;
703 c->open_confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000704}
Damien Miller4f7becb2006-03-26 14:10:14 +1100705
Ben Lindstrome9c99912001-06-09 00:41:05 +0000706void
Damien Miller39eda6e2005-11-05 14:52:50 +1100707channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000708{
Damien Millerd47c62a2005-12-13 19:33:57 +1100709 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000710
Ben Lindstrome9c99912001-06-09 00:41:05 +0000711 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000712 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000713 return;
714 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000715 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100716 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000717}
Damien Miller4f7becb2006-03-26 14:10:14 +1100718
Ben Lindstrome9c99912001-06-09 00:41:05 +0000719void
720channel_cancel_cleanup(int id)
721{
Damien Millerd47c62a2005-12-13 19:33:57 +1100722 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000723
Ben Lindstrome9c99912001-06-09 00:41:05 +0000724 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000725 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000726 return;
727 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000728 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100729 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000730}
Damien Miller4f7becb2006-03-26 14:10:14 +1100731
Ben Lindstrome9c99912001-06-09 00:41:05 +0000732void
Damien Miller077b2382005-12-31 16:22:32 +1100733channel_register_filter(int id, channel_infilter_fn *ifn,
Darren Tucker84c56f52008-06-13 04:55:46 +1000734 channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000735{
736 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000737
Ben Lindstrome9c99912001-06-09 00:41:05 +0000738 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000739 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000740 return;
741 }
Damien Miller077b2382005-12-31 16:22:32 +1100742 c->input_filter = ifn;
743 c->output_filter = ofn;
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000744 c->filter_ctx = ctx;
Darren Tucker84c56f52008-06-13 04:55:46 +1000745 c->filter_cleanup = cfn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000746}
747
748void
749channel_set_fds(int id, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000750 int extusage, int nonblock, int is_tty, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000751{
752 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000753
Ben Lindstrome9c99912001-06-09 00:41:05 +0000754 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
755 fatal("channel_activate for non-larval channel %d.", id);
Darren Tuckered3cdc02008-06-16 23:29:18 +1000756 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000757 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100758 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000759 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
760 packet_put_int(c->remote_id);
761 packet_put_int(c->local_window);
762 packet_send();
763}
764
Damien Miller5428f641999-11-25 11:54:57 +1100765/*
Damien Millerb38eff82000-04-01 11:09:21 +1000766 * 'channel_pre*' are called just before select() to add any bits relevant to
767 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100768 */
Damien Millerb38eff82000-04-01 11:09:21 +1000769/*
770 * 'channel_post*': perform any appropriate operations for channels which
771 * have events pending.
772 */
Damien Millerd62f2ca2006-03-26 13:57:41 +1100773typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000774chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
775chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
776
Damien Miller8473dd82006-07-24 14:08:32 +1000777/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000778static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100779channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000780{
781 FD_SET(c->sock, readset);
782}
783
Damien Miller8473dd82006-07-24 14:08:32 +1000784/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000785static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100786channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000787{
788 debug3("channel %d: waiting for connection", c->self);
789 FD_SET(c->sock, writeset);
790}
791
Ben Lindstrombba81212001-06-25 05:01:22 +0000792static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100793channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000794{
795 if (buffer_len(&c->input) < packet_get_maxsize())
796 FD_SET(c->sock, readset);
797 if (buffer_len(&c->output) > 0)
798 FD_SET(c->sock, writeset);
799}
800
Ben Lindstrombba81212001-06-25 05:01:22 +0000801static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100802channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000803{
Damien Millerde6987c2002-01-22 23:20:40 +1100804 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000805
Damien Miller33b13562000-04-04 14:38:59 +1000806 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100807 limit > 0 &&
Damien Miller499a0d52006-04-23 12:06:03 +1000808 buffer_len(&c->input) < limit &&
809 buffer_check_alloc(&c->input, CHAN_RBUF))
Damien Miller33b13562000-04-04 14:38:59 +1000810 FD_SET(c->rfd, readset);
811 if (c->ostate == CHAN_OUTPUT_OPEN ||
812 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
813 if (buffer_len(&c->output) > 0) {
814 FD_SET(c->wfd, writeset);
815 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000816 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000817 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
818 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000819 else
820 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000821 }
822 }
823 /** XXX check close conditions, too */
Damien Millerd654dd22008-05-19 16:05:41 +1000824 if (compat20 && c->efd != -1 &&
825 !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) {
Damien Miller33b13562000-04-04 14:38:59 +1000826 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
827 buffer_len(&c->extended) > 0)
828 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000829 else if (!(c->flags & CHAN_EOF_SENT) &&
830 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000831 buffer_len(&c->extended) < c->remote_window)
832 FD_SET(c->efd, readset);
833 }
Damien Miller0e220db2004-06-15 10:34:08 +1000834 /* XXX: What about efd? races? */
Darren Tuckerfc959702004-07-17 16:12:08 +1000835 if (compat20 && c->ctl_fd != -1 &&
Damien Miller0e220db2004-06-15 10:34:08 +1000836 c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN)
837 FD_SET(c->ctl_fd, readset);
Damien Miller33b13562000-04-04 14:38:59 +1000838}
839
Damien Miller8473dd82006-07-24 14:08:32 +1000840/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000841static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100842channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000843{
844 if (buffer_len(&c->input) == 0) {
845 packet_start(SSH_MSG_CHANNEL_CLOSE);
846 packet_put_int(c->remote_id);
847 packet_send();
848 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000849 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000850 }
851}
852
Damien Miller8473dd82006-07-24 14:08:32 +1000853/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000854static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100855channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000856{
857 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000858 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000859 else
Damien Millerb38eff82000-04-01 11:09:21 +1000860 FD_SET(c->sock, writeset);
861}
862
863/*
864 * This is a special state for X11 authentication spoofing. An opened X11
865 * connection (when authentication spoofing is being done) remains in this
866 * state until the first packet has been completely read. The authentication
867 * data in that packet is then substituted by the real data if it matches the
868 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000869 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000870 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000871 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000872static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000873x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000874{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000875 u_char *ucp;
876 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000877
878 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000879 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000880 return 0;
881
882 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100883 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000884 if (ucp[0] == 0x42) { /* Byte order MSB first. */
885 proto_len = 256 * ucp[6] + ucp[7];
886 data_len = 256 * ucp[8] + ucp[9];
887 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
888 proto_len = ucp[6] + 256 * ucp[7];
889 data_len = ucp[8] + 256 * ucp[9];
890 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000891 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100892 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000893 return -1;
894 }
895
896 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000897 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000898 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
899 return 0;
900
901 /* Check if authentication protocol matches. */
902 if (proto_len != strlen(x11_saved_proto) ||
903 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000904 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000905 return -1;
906 }
907 /* Check if authentication data matches our fake data. */
908 if (data_len != x11_fake_data_len ||
909 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
910 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000911 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000912 return -1;
913 }
914 /* Check fake data length */
915 if (x11_fake_data_len != x11_saved_data_len) {
916 error("X11 fake_data_len %d != saved_data_len %d",
917 x11_fake_data_len, x11_saved_data_len);
918 return -1;
919 }
920 /*
921 * Received authentication protocol and data match
922 * our fake data. Substitute the fake data with real
923 * data.
924 */
925 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
926 x11_saved_data, x11_saved_data_len);
927 return 1;
928}
929
Ben Lindstrombba81212001-06-25 05:01:22 +0000930static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100931channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000932{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000933 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000934
Damien Millerb38eff82000-04-01 11:09:21 +1000935 if (ret == 1) {
936 /* Start normal processing for the channel. */
937 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000938 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000939 } else if (ret == -1) {
940 /*
941 * We have received an X11 connection that has bad
942 * authentication information.
943 */
Damien Miller996acd22003-04-09 20:59:48 +1000944 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000945 buffer_clear(&c->input);
946 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000947 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000948 c->sock = -1;
949 c->type = SSH_CHANNEL_CLOSED;
950 packet_start(SSH_MSG_CHANNEL_CLOSE);
951 packet_put_int(c->remote_id);
952 packet_send();
953 }
954}
955
Ben Lindstrombba81212001-06-25 05:01:22 +0000956static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100957channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000958{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000959 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000960
961 /* c->force_drain = 1; */
962
Damien Millerb38eff82000-04-01 11:09:21 +1000963 if (ret == 1) {
964 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100965 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000966 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000967 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000968 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100969 chan_read_failed(c);
970 buffer_clear(&c->input);
971 chan_ibuf_empty(c);
972 buffer_clear(&c->output);
973 /* for proto v1, the peer will send an IEOF */
974 if (compat20)
975 chan_write_failed(c);
976 else
977 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000978 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000979 }
980}
981
Ben Lindstromb3921512001-04-11 15:57:50 +0000982/* try to decode a socks4 header */
Damien Miller8473dd82006-07-24 14:08:32 +1000983/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000984static int
Damien Millerd62f2ca2006-03-26 13:57:41 +1100985channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000986{
Damien Millera10f5612002-09-12 09:49:15 +1000987 char *p, *host;
Damien Miller1781f532009-01-28 16:24:41 +1100988 u_int len, have, i, found, need;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100989 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000990 struct {
991 u_int8_t version;
992 u_int8_t command;
993 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000994 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000995 } s4_req, s4_rsp;
996
Ben Lindstromb3921512001-04-11 15:57:50 +0000997 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000998
999 have = buffer_len(&c->input);
1000 len = sizeof(s4_req);
1001 if (have < len)
1002 return 0;
1003 p = buffer_ptr(&c->input);
Damien Miller1781f532009-01-28 16:24:41 +11001004
1005 need = 1;
1006 /* SOCKS4A uses an invalid IP address 0.0.0.x */
1007 if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) {
1008 debug2("channel %d: socks4a request", c->self);
1009 /* ... and needs an extra string (the hostname) */
1010 need = 2;
1011 }
1012 /* Check for terminating NUL on the string(s) */
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001013 for (found = 0, i = len; i < have; i++) {
1014 if (p[i] == '\0') {
Damien Miller1781f532009-01-28 16:24:41 +11001015 found++;
1016 if (found == need)
1017 break;
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001018 }
1019 if (i > 1024) {
1020 /* the peer is probably sending garbage */
1021 debug("channel %d: decode socks4: too long",
1022 c->self);
1023 return -1;
1024 }
1025 }
Damien Miller1781f532009-01-28 16:24:41 +11001026 if (found < need)
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001027 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001028 buffer_get(&c->input, (char *)&s4_req.version, 1);
1029 buffer_get(&c->input, (char *)&s4_req.command, 1);
1030 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +00001031 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001032 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001033 p = buffer_ptr(&c->input);
1034 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001035 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Damien Miller1781f532009-01-28 16:24:41 +11001036 len++; /* trailing '\0' */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001037 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +00001038 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001039 c->self, len, have);
1040 strlcpy(username, p, sizeof(username));
1041 buffer_consume(&c->input, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001042
Damien Millera1c1b6c2009-01-28 16:29:49 +11001043 if (c->path != NULL) {
1044 xfree(c->path);
1045 c->path = NULL;
1046 }
Damien Miller1781f532009-01-28 16:24:41 +11001047 if (need == 1) { /* SOCKS4: one string */
1048 host = inet_ntoa(s4_req.dest_addr);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001049 c->path = xstrdup(host);
Damien Miller1781f532009-01-28 16:24:41 +11001050 } else { /* SOCKS4A: two strings */
1051 have = buffer_len(&c->input);
1052 p = buffer_ptr(&c->input);
1053 len = strlen(p);
1054 debug2("channel %d: decode socks4a: host %s/%d",
1055 c->self, p, len);
1056 len++; /* trailing '\0' */
1057 if (len > have)
1058 fatal("channel %d: decode socks4a: len %d > have %d",
1059 c->self, len, have);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001060 if (len > NI_MAXHOST) {
Damien Miller1781f532009-01-28 16:24:41 +11001061 error("channel %d: hostname \"%.100s\" too long",
1062 c->self, p);
1063 return -1;
1064 }
Damien Millera1c1b6c2009-01-28 16:29:49 +11001065 c->path = xstrdup(p);
Damien Miller1781f532009-01-28 16:24:41 +11001066 buffer_consume(&c->input, len);
1067 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001068 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001069
Damien Millerfbdeece2003-09-02 22:52:31 +10001070 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Damien Miller1781f532009-01-28 16:24:41 +11001071 c->self, c->path, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001072
Ben Lindstromb3921512001-04-11 15:57:50 +00001073 if (s4_req.command != 1) {
Damien Miller1781f532009-01-28 16:24:41 +11001074 debug("channel %d: cannot handle: %s cn %d",
1075 c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command);
Ben Lindstromb3921512001-04-11 15:57:50 +00001076 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001077 }
Ben Lindstromb3921512001-04-11 15:57:50 +00001078 s4_rsp.version = 0; /* vn: 0 for reply */
1079 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001080 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +00001081 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Damien Millera0fdce92006-03-26 14:28:50 +11001082 buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +00001083 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001084}
1085
Darren Tucker46471c92003-07-03 13:55:19 +10001086/* try to decode a socks5 header */
1087#define SSH_SOCKS5_AUTHDONE 0x1000
1088#define SSH_SOCKS5_NOAUTH 0x00
1089#define SSH_SOCKS5_IPV4 0x01
1090#define SSH_SOCKS5_DOMAIN 0x03
1091#define SSH_SOCKS5_IPV6 0x04
1092#define SSH_SOCKS5_CONNECT 0x01
1093#define SSH_SOCKS5_SUCCESS 0x00
1094
Damien Miller8473dd82006-07-24 14:08:32 +10001095/* ARGSUSED */
Darren Tucker46471c92003-07-03 13:55:19 +10001096static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001097channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
Darren Tucker46471c92003-07-03 13:55:19 +10001098{
1099 struct {
1100 u_int8_t version;
1101 u_int8_t command;
1102 u_int8_t reserved;
1103 u_int8_t atyp;
1104 } s5_req, s5_rsp;
1105 u_int16_t dest_port;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001106 u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN];
Damien Miller0f077072006-07-10 22:21:02 +10001107 u_int have, need, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001108
1109 debug2("channel %d: decode socks5", c->self);
1110 p = buffer_ptr(&c->input);
1111 if (p[0] != 0x05)
1112 return -1;
1113 have = buffer_len(&c->input);
1114 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1115 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001116 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001117 return 0;
1118 nmethods = p[1];
1119 if (have < nmethods + 2)
1120 return 0;
1121 /* look for method: "NO AUTHENTICATION REQUIRED" */
Damien Miller80163902007-01-05 16:30:16 +11001122 for (found = 0, i = 2; i < nmethods + 2; i++) {
Damien Miller4dec5d72006-08-05 11:38:40 +10001123 if (p[i] == SSH_SOCKS5_NOAUTH) {
Darren Tucker46471c92003-07-03 13:55:19 +10001124 found = 1;
1125 break;
1126 }
1127 }
1128 if (!found) {
1129 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1130 c->self);
1131 return -1;
1132 }
1133 buffer_consume(&c->input, nmethods + 2);
1134 buffer_put_char(&c->output, 0x05); /* version */
1135 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1136 FD_SET(c->sock, writeset);
1137 c->flags |= SSH_SOCKS5_AUTHDONE;
1138 debug2("channel %d: socks5 auth done", c->self);
1139 return 0; /* need more */
1140 }
1141 debug2("channel %d: socks5 post auth", c->self);
1142 if (have < sizeof(s5_req)+1)
1143 return 0; /* need more */
Damien Millere3b21a52006-03-26 14:29:06 +11001144 memcpy(&s5_req, p, sizeof(s5_req));
Darren Tucker46471c92003-07-03 13:55:19 +10001145 if (s5_req.version != 0x05 ||
1146 s5_req.command != SSH_SOCKS5_CONNECT ||
1147 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001148 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001149 return -1;
1150 }
Darren Tucker47eede72005-03-14 23:08:12 +11001151 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001152 case SSH_SOCKS5_IPV4:
1153 addrlen = 4;
1154 af = AF_INET;
1155 break;
1156 case SSH_SOCKS5_DOMAIN:
1157 addrlen = p[sizeof(s5_req)];
1158 af = -1;
1159 break;
1160 case SSH_SOCKS5_IPV6:
1161 addrlen = 16;
1162 af = AF_INET6;
1163 break;
1164 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001165 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001166 return -1;
1167 }
Damien Miller0f077072006-07-10 22:21:02 +10001168 need = sizeof(s5_req) + addrlen + 2;
1169 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1170 need++;
1171 if (have < need)
Darren Tucker46471c92003-07-03 13:55:19 +10001172 return 0;
1173 buffer_consume(&c->input, sizeof(s5_req));
1174 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1175 buffer_consume(&c->input, 1); /* host string length */
1176 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1177 buffer_get(&c->input, (char *)&dest_port, 2);
1178 dest_addr[addrlen] = '\0';
Damien Millera1c1b6c2009-01-28 16:29:49 +11001179 if (c->path != NULL) {
1180 xfree(c->path);
1181 c->path = NULL;
1182 }
1183 if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
Damien Miller9576ac42009-01-28 16:30:33 +11001184 if (addrlen >= NI_MAXHOST) {
Damien Millera1c1b6c2009-01-28 16:29:49 +11001185 error("channel %d: dynamic request: socks5 hostname "
1186 "\"%.100s\" too long", c->self, dest_addr);
1187 return -1;
1188 }
1189 c->path = xstrdup(dest_addr);
1190 } else {
1191 if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL)
1192 return -1;
1193 c->path = xstrdup(ntop);
1194 }
Darren Tucker46471c92003-07-03 13:55:19 +10001195 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001196
Damien Millerfbdeece2003-09-02 22:52:31 +10001197 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001198 c->self, c->path, c->host_port, s5_req.command);
1199
1200 s5_rsp.version = 0x05;
1201 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1202 s5_rsp.reserved = 0; /* ignored */
1203 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1204 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1205 dest_port = 0; /* ignored */
1206
Damien Millera0fdce92006-03-26 14:28:50 +11001207 buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp));
1208 buffer_append(&c->output, &dest_addr, sizeof(struct in_addr));
1209 buffer_append(&c->output, &dest_port, sizeof(dest_port));
Darren Tucker46471c92003-07-03 13:55:19 +10001210 return 1;
1211}
1212
Ben Lindstromb3921512001-04-11 15:57:50 +00001213/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001214static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001215channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstromb3921512001-04-11 15:57:50 +00001216{
1217 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001218 u_int have;
1219 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001220
1221 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +10001222 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +00001223 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001224 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001225 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001226 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001227 /* need more */
1228 FD_SET(c->sock, readset);
1229 return;
1230 }
1231 /* try to guess the protocol */
1232 p = buffer_ptr(&c->input);
1233 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001234 case 0x04:
1235 ret = channel_decode_socks4(c, readset, writeset);
1236 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001237 case 0x05:
1238 ret = channel_decode_socks5(c, readset, writeset);
1239 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001240 default:
1241 ret = -1;
1242 break;
1243 }
1244 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001245 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001246 } else if (ret == 0) {
1247 debug2("channel %d: pre_dynamic: need more", c->self);
1248 /* need more */
1249 FD_SET(c->sock, readset);
1250 } else {
1251 /* switch to the next state */
1252 c->type = SSH_CHANNEL_OPENING;
1253 port_open_helper(c, "direct-tcpip");
1254 }
1255}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001256
Damien Millerb38eff82000-04-01 11:09:21 +10001257/* This is our fake X11 server socket. */
Damien Miller8473dd82006-07-24 14:08:32 +10001258/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001259static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001260channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001261{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001262 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001263 struct sockaddr_storage addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001264 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001265 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001266 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001267 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001268
1269 if (FD_ISSET(c->sock, readset)) {
1270 debug("X11 connection requested.");
1271 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001272 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001273 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001274 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001275 channel_close_fd(&c->sock);
1276 chan_mark_dead(c);
1277 }
Damien Millerb38eff82000-04-01 11:09:21 +10001278 if (newsock < 0) {
1279 error("accept: %.100s", strerror(errno));
1280 return;
1281 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001282 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001283 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001284 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001285 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001286 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001287
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001288 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001289 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001290 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001291 if (compat20) {
1292 packet_start(SSH2_MSG_CHANNEL_OPEN);
1293 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001294 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001295 packet_put_int(nc->local_window_max);
1296 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001297 /* originator ipaddr and port */
1298 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001299 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001300 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001301 } else {
1302 packet_put_int(remote_port);
1303 }
Damien Millerbd483e72000-04-30 10:00:53 +10001304 packet_send();
1305 } else {
1306 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001307 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001308 if (packet_get_protocol_flags() &
1309 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001310 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001311 packet_send();
1312 }
Damien Millerd83ff352001-01-30 09:19:34 +11001313 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001314 }
1315}
1316
Ben Lindstrombba81212001-06-25 05:01:22 +00001317static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001318port_open_helper(Channel *c, char *rtype)
1319{
1320 int direct;
1321 char buf[1024];
1322 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001323 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001324
1325 direct = (strcmp(rtype, "direct-tcpip") == 0);
1326
1327 snprintf(buf, sizeof buf,
1328 "%s: listening port %d for %.100s port %d, "
1329 "connect from %.200s port %d",
1330 rtype, c->listening_port, c->path, c->host_port,
1331 remote_ipaddr, remote_port);
1332
1333 xfree(c->remote_name);
1334 c->remote_name = xstrdup(buf);
1335
1336 if (compat20) {
1337 packet_start(SSH2_MSG_CHANNEL_OPEN);
1338 packet_put_cstring(rtype);
1339 packet_put_int(c->self);
1340 packet_put_int(c->local_window_max);
1341 packet_put_int(c->local_maxpacket);
1342 if (direct) {
1343 /* target host, port */
1344 packet_put_cstring(c->path);
1345 packet_put_int(c->host_port);
1346 } else {
1347 /* listen address, port */
1348 packet_put_cstring(c->path);
1349 packet_put_int(c->listening_port);
1350 }
1351 /* originator host and port */
1352 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001353 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001354 packet_send();
1355 } else {
1356 packet_start(SSH_MSG_PORT_OPEN);
1357 packet_put_int(c->self);
1358 packet_put_cstring(c->path);
1359 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001360 if (packet_get_protocol_flags() &
1361 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001362 packet_put_cstring(c->remote_name);
1363 packet_send();
1364 }
1365 xfree(remote_ipaddr);
1366}
1367
Damien Miller5e7fd072005-11-05 14:53:39 +11001368static void
1369channel_set_reuseaddr(int fd)
1370{
1371 int on = 1;
1372
1373 /*
1374 * Set socket options.
1375 * Allow local port reuse in TIME_WAIT.
1376 */
1377 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1378 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1379}
1380
Damien Millerb38eff82000-04-01 11:09:21 +10001381/*
1382 * This socket is listening for connections to a forwarded TCP/IP port.
1383 */
Damien Miller8473dd82006-07-24 14:08:32 +10001384/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001385static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001386channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001387{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001388 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001389 struct sockaddr_storage addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001390 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001391 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001392 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001393
Damien Millerb38eff82000-04-01 11:09:21 +10001394 if (FD_ISSET(c->sock, readset)) {
1395 debug("Connection to port %d forwarding "
1396 "to %.100s port %d requested.",
1397 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001398
Damien Miller4623a752001-10-10 15:03:58 +10001399 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1400 nextstate = SSH_CHANNEL_OPENING;
1401 rtype = "forwarded-tcpip";
1402 } else {
1403 if (c->host_port == 0) {
1404 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001405 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001406 } else {
1407 nextstate = SSH_CHANNEL_OPENING;
1408 rtype = "direct-tcpip";
1409 }
1410 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001411
Damien Millerb38eff82000-04-01 11:09:21 +10001412 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001413 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001414 if (newsock < 0) {
1415 error("accept: %.100s", strerror(errno));
1416 return;
1417 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001418 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001419 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1420 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001421 nc->listening_port = c->listening_port;
1422 nc->host_port = c->host_port;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001423 if (c->path != NULL)
1424 nc->path = xstrdup(c->path);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001425
Damien Miller4623a752001-10-10 15:03:58 +10001426 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1427 /*
1428 * do not call the channel_post handler until
1429 * this flag has been reset by a pre-handler.
1430 * otherwise the FD_ISSET calls might overflow
1431 */
1432 nc->delayed = 1;
1433 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001434 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001435 }
Damien Millerb38eff82000-04-01 11:09:21 +10001436 }
1437}
1438
1439/*
1440 * This is the authentication agent socket listening for connections from
1441 * clients.
1442 */
Damien Miller8473dd82006-07-24 14:08:32 +10001443/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001444static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001445channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001446{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001447 Channel *nc;
1448 int newsock;
Damien Miller163886f2008-07-14 11:28:58 +10001449 struct sockaddr_storage addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001450 socklen_t addrlen;
1451
1452 if (FD_ISSET(c->sock, readset)) {
1453 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001454 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001455 if (newsock < 0) {
1456 error("accept from auth socket: %.100s", strerror(errno));
1457 return;
1458 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001459 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001460 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1461 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001462 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001463 if (compat20) {
1464 packet_start(SSH2_MSG_CHANNEL_OPEN);
1465 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001466 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001467 packet_put_int(c->local_window_max);
1468 packet_put_int(c->local_maxpacket);
1469 } else {
1470 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001471 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001472 }
Damien Millerb38eff82000-04-01 11:09:21 +10001473 packet_send();
1474 }
1475}
1476
Damien Miller8473dd82006-07-24 14:08:32 +10001477/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001478static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001479channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001480{
Damien Millerbd740252008-05-19 15:37:09 +10001481 int err = 0, sock;
Ben Lindstrom11180952001-07-04 05:13:35 +00001482 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001483
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001484 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001485 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001486 err = errno;
1487 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001488 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001489 if (err == 0) {
Damien Millerbd740252008-05-19 15:37:09 +10001490 debug("channel %d: connected to %s port %d",
1491 c->self, c->connect_ctx.host, c->connect_ctx.port);
1492 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001493 c->type = SSH_CHANNEL_OPEN;
1494 if (compat20) {
1495 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1496 packet_put_int(c->remote_id);
1497 packet_put_int(c->self);
1498 packet_put_int(c->local_window);
1499 packet_put_int(c->local_maxpacket);
1500 } else {
1501 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1502 packet_put_int(c->remote_id);
1503 packet_put_int(c->self);
1504 }
1505 } else {
Damien Millerbd740252008-05-19 15:37:09 +10001506 debug("channel %d: connection failed: %s",
Ben Lindstrom69128662001-05-08 20:07:39 +00001507 c->self, strerror(err));
Damien Millerbd740252008-05-19 15:37:09 +10001508 /* Try next address, if any */
1509 if ((sock = connect_next(&c->connect_ctx)) > 0) {
1510 close(c->sock);
1511 c->sock = c->rfd = c->wfd = sock;
1512 channel_max_fd = channel_find_maxfd();
1513 return;
1514 }
1515 /* Exhausted all addresses */
1516 error("connect_to %.100s port %d: failed.",
1517 c->connect_ctx.host, c->connect_ctx.port);
1518 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001519 if (compat20) {
1520 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1521 packet_put_int(c->remote_id);
1522 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1523 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1524 packet_put_cstring(strerror(err));
1525 packet_put_cstring("");
1526 }
1527 } else {
1528 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1529 packet_put_int(c->remote_id);
1530 }
1531 chan_mark_dead(c);
1532 }
1533 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001534 }
1535}
1536
Damien Miller8473dd82006-07-24 14:08:32 +10001537/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001538static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001539channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001540{
Darren Tucker11327cc2005-03-14 23:22:25 +11001541 char buf[CHAN_RBUF];
Damien Miller835284b2007-06-11 13:03:16 +10001542 int len, force;
Damien Millerb38eff82000-04-01 11:09:21 +10001543
Damien Miller835284b2007-06-11 13:03:16 +10001544 force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED;
1545 if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001546 errno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001547 len = read(c->rfd, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +10001548 if (len < 0 && (errno == EINTR ||
1549 ((errno == EAGAIN || errno == EWOULDBLOCK) && !force)))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001550 return 1;
Darren Tucker9afe1152006-06-23 21:24:12 +10001551#ifndef PTY_ZEROREAD
Damien Millerb38eff82000-04-01 11:09:21 +10001552 if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001553#else
Darren Tucker144e8d62006-06-25 08:25:25 +10001554 if ((!c->isatty && len <= 0) ||
1555 (c->isatty && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001556#endif
Damien Millerfbdeece2003-09-02 22:52:31 +10001557 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001558 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001559 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001560 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001561 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001562 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001563 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001564 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001565 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001566 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001567 } else {
1568 chan_read_failed(c);
1569 }
1570 return -1;
1571 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001572 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001573 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001574 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001575 chan_read_failed(c);
1576 }
Damien Millerd27b9472005-12-13 19:29:02 +11001577 } else if (c->datagram) {
1578 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001579 } else {
1580 buffer_append(&c->input, buf, len);
1581 }
Damien Millerb38eff82000-04-01 11:09:21 +10001582 }
1583 return 1;
1584}
Damien Miller4f7becb2006-03-26 14:10:14 +11001585
Damien Miller8473dd82006-07-24 14:08:32 +10001586/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001587static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001588channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001589{
Ben Lindstrome229b252001-03-05 06:28:06 +00001590 struct termios tio;
Damien Miller077b2382005-12-31 16:22:32 +11001591 u_char *data = NULL, *buf;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001592 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001593 int len;
1594
1595 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001596 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001597 FD_ISSET(c->wfd, writeset) &&
1598 buffer_len(&c->output) > 0) {
Damien Miller077b2382005-12-31 16:22:32 +11001599 if (c->output_filter != NULL) {
1600 if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1601 debug2("channel %d: filter stops", c->self);
Damien Millere204f6a2006-01-31 21:47:15 +11001602 if (c->type != SSH_CHANNEL_OPEN)
1603 chan_mark_dead(c);
1604 else
1605 chan_write_failed(c);
1606 return -1;
Damien Miller077b2382005-12-31 16:22:32 +11001607 }
1608 } else if (c->datagram) {
1609 buf = data = buffer_get_string(&c->output, &dlen);
1610 } else {
1611 buf = data = buffer_ptr(&c->output);
1612 dlen = buffer_len(&c->output);
1613 }
1614
Damien Millerd27b9472005-12-13 19:29:02 +11001615 if (c->datagram) {
Damien Millerd27b9472005-12-13 19:29:02 +11001616 /* ignore truncated writes, datagrams might get lost */
1617 c->local_consumed += dlen + 4;
Damien Miller077b2382005-12-31 16:22:32 +11001618 len = write(c->wfd, buf, dlen);
Damien Millerd27b9472005-12-13 19:29:02 +11001619 xfree(data);
Damien Millerd8968ad2008-07-04 23:10:49 +10001620 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1621 errno == EWOULDBLOCK))
Damien Millerd27b9472005-12-13 19:29:02 +11001622 return 1;
1623 if (len <= 0) {
1624 if (c->type != SSH_CHANNEL_OPEN)
1625 chan_mark_dead(c);
1626 else
1627 chan_write_failed(c);
1628 return -1;
1629 }
1630 return 1;
1631 }
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001632#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001633 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001634 if (compat20 && c->wfd_isatty)
1635 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001636#endif
Damien Miller077b2382005-12-31 16:22:32 +11001637
1638 len = write(c->wfd, buf, dlen);
Damien Millerd8968ad2008-07-04 23:10:49 +10001639 if (len < 0 &&
1640 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001641 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001642 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001643 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001644 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001645 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001646 return -1;
1647 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001648 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001649 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001650 c->type = SSH_CHANNEL_INPUT_DRAINING;
1651 } else {
1652 chan_write_failed(c);
1653 }
1654 return -1;
1655 }
Damien Miller077b2382005-12-31 16:22:32 +11001656 if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001657 if (tcgetattr(c->wfd, &tio) == 0 &&
1658 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1659 /*
1660 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001661 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001662 * size of a SSH2_MSG_CHANNEL_DATA message
Damien Miller077b2382005-12-31 16:22:32 +11001663 * (4 byte channel id + buf)
Damien Miller79438cc2001-02-16 12:34:57 +11001664 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001665 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001666 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001667 }
1668 }
Damien Millerb38eff82000-04-01 11:09:21 +10001669 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001670 if (compat20 && len > 0) {
1671 c->local_consumed += len;
1672 }
1673 }
1674 return 1;
1675}
Damien Miller4f7becb2006-03-26 14:10:14 +11001676
Ben Lindstrombba81212001-06-25 05:01:22 +00001677static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001678channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller33b13562000-04-04 14:38:59 +10001679{
Darren Tucker11327cc2005-03-14 23:22:25 +11001680 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001681 int len;
1682
Damien Miller1383bd82000-04-06 12:32:37 +10001683/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001684 if (c->efd != -1) {
1685 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1686 FD_ISSET(c->efd, writeset) &&
1687 buffer_len(&c->extended) > 0) {
1688 len = write(c->efd, buffer_ptr(&c->extended),
1689 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001690 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001691 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001692 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1693 errno == EWOULDBLOCK))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001694 return 1;
1695 if (len <= 0) {
1696 debug2("channel %d: closing write-efd %d",
1697 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001698 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001699 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001700 buffer_consume(&c->extended, len);
1701 c->local_consumed += len;
1702 }
1703 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
Damien Millere42bd242007-01-29 10:16:28 +11001704 (c->detach_close || FD_ISSET(c->efd, readset))) {
Damien Miller33b13562000-04-04 14:38:59 +10001705 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001706 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001707 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001708 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
1709 errno == EWOULDBLOCK) && !c->detach_close)))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001710 return 1;
1711 if (len <= 0) {
1712 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001713 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001714 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001715 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001716 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001717 }
Damien Miller33b13562000-04-04 14:38:59 +10001718 }
1719 }
1720 return 1;
1721}
Damien Miller4f7becb2006-03-26 14:10:14 +11001722
Damien Miller8473dd82006-07-24 14:08:32 +10001723/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001724static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001725channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller0e220db2004-06-15 10:34:08 +10001726{
1727 char buf[16];
1728 int len;
1729
1730 /* Monitor control fd to detect if the slave client exits */
1731 if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) {
1732 len = read(c->ctl_fd, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +10001733 if (len < 0 &&
1734 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK))
Damien Miller0e220db2004-06-15 10:34:08 +10001735 return 1;
1736 if (len <= 0) {
1737 debug2("channel %d: ctl read<=0", c->self);
1738 if (c->type != SSH_CHANNEL_OPEN) {
1739 debug2("channel %d: not open", c->self);
1740 chan_mark_dead(c);
1741 return -1;
1742 } else {
1743 chan_read_failed(c);
1744 chan_write_failed(c);
1745 }
1746 return -1;
1747 } else
1748 fatal("%s: unexpected data on ctl fd", __func__);
1749 }
1750 return 1;
1751}
Damien Miller4f7becb2006-03-26 14:10:14 +11001752
Damien Miller0e220db2004-06-15 10:34:08 +10001753static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001754channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001755{
Ben Lindstromb3921512001-04-11 15:57:50 +00001756 if (c->type == SSH_CHANNEL_OPEN &&
1757 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Darren Tuckerae09cb82007-06-25 19:04:46 +10001758 ((c->local_window_max - c->local_window >
Damien Miller3191a8e2007-06-11 18:33:15 +10001759 c->local_maxpacket*3) ||
1760 c->local_window < c->local_window_max/2) &&
Damien Miller33b13562000-04-04 14:38:59 +10001761 c->local_consumed > 0) {
1762 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1763 packet_put_int(c->remote_id);
1764 packet_put_int(c->local_consumed);
1765 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001766 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001767 c->self, c->local_window,
1768 c->local_consumed);
1769 c->local_window += c->local_consumed;
1770 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001771 }
1772 return 1;
1773}
1774
Ben Lindstrombba81212001-06-25 05:01:22 +00001775static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001776channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001777{
Damien Miller4623a752001-10-10 15:03:58 +10001778 if (c->delayed)
1779 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001780 channel_handle_rfd(c, readset, writeset);
1781 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001782 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001783 return;
Damien Miller33b13562000-04-04 14:38:59 +10001784 channel_handle_efd(c, readset, writeset);
Damien Miller0e220db2004-06-15 10:34:08 +10001785 channel_handle_ctl(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001786 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001787}
1788
Damien Miller8473dd82006-07-24 14:08:32 +10001789/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001790static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001791channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001792{
1793 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001794
Damien Millerb38eff82000-04-01 11:09:21 +10001795 /* Send buffered output data to the socket. */
1796 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1797 len = write(c->sock, buffer_ptr(&c->output),
1798 buffer_len(&c->output));
1799 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001800 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001801 else
1802 buffer_consume(&c->output, len);
1803 }
1804}
1805
Ben Lindstrombba81212001-06-25 05:01:22 +00001806static void
Damien Miller33b13562000-04-04 14:38:59 +10001807channel_handler_init_20(void)
1808{
Damien Millerde6987c2002-01-22 23:20:40 +11001809 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001810 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001811 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001812 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001813 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001814 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001815 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001816 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001817
Damien Millerde6987c2002-01-22 23:20:40 +11001818 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001819 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001820 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001821 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001822 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001823 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001824 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001825}
1826
Ben Lindstrombba81212001-06-25 05:01:22 +00001827static void
Damien Millerb38eff82000-04-01 11:09:21 +10001828channel_handler_init_13(void)
1829{
1830 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1831 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1832 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1833 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1834 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1835 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1836 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001837 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001838 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001839
Damien Millerde6987c2002-01-22 23:20:40 +11001840 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001841 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1842 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1843 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1844 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001845 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001846 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001847}
1848
Ben Lindstrombba81212001-06-25 05:01:22 +00001849static void
Damien Millerb38eff82000-04-01 11:09:21 +10001850channel_handler_init_15(void)
1851{
Damien Millerde6987c2002-01-22 23:20:40 +11001852 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001853 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001854 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1855 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1856 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001857 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001858 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001859
1860 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1861 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1862 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001863 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001864 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001865 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001866}
1867
Ben Lindstrombba81212001-06-25 05:01:22 +00001868static void
Damien Millerb38eff82000-04-01 11:09:21 +10001869channel_handler_init(void)
1870{
1871 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001872
Damien Miller9f0f5c62001-12-21 14:45:46 +11001873 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001874 channel_pre[i] = NULL;
1875 channel_post[i] = NULL;
1876 }
Damien Miller33b13562000-04-04 14:38:59 +10001877 if (compat20)
1878 channel_handler_init_20();
1879 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001880 channel_handler_init_13();
1881 else
1882 channel_handler_init_15();
1883}
1884
Damien Miller3ec27592001-10-12 11:35:04 +10001885/* gc dead channels */
1886static void
1887channel_garbage_collect(Channel *c)
1888{
1889 if (c == NULL)
1890 return;
1891 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11001892 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10001893 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001894 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001895 c->detach_user(c->self, NULL);
1896 /* if we still have a callback */
1897 if (c->detach_user != NULL)
1898 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001899 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001900 }
1901 if (!chan_is_dead(c, 1))
1902 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001903 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001904 channel_free(c);
1905}
1906
Ben Lindstrombba81212001-06-25 05:01:22 +00001907static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001908channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001909{
1910 static int did_init = 0;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001911 u_int i;
Damien Millerb38eff82000-04-01 11:09:21 +10001912 Channel *c;
1913
1914 if (!did_init) {
1915 channel_handler_init();
1916 did_init = 1;
1917 }
1918 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001919 c = channels[i];
1920 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001921 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001922 if (ftab[c->type] != NULL)
1923 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001924 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001925 }
1926}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001927
Ben Lindstrome9c99912001-06-09 00:41:05 +00001928/*
1929 * Allocate/update select bitmasks and add any bits relevant to channels in
1930 * select bitmasks.
1931 */
Damien Miller4af51302000-04-16 11:18:38 +10001932void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001933channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001934 u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001935{
Damien Miller36812092006-03-26 14:22:47 +11001936 u_int n, sz, nfdset;
Damien Miller5e953212001-01-30 09:14:00 +11001937
1938 n = MAX(*maxfdp, channel_max_fd);
1939
Damien Miller36812092006-03-26 14:22:47 +11001940 nfdset = howmany(n+1, NFDBITS);
1941 /* Explicitly test here, because xrealloc isn't always called */
1942 if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask))
1943 fatal("channel_prepare_select: max_fd (%d) is too large", n);
1944 sz = nfdset * sizeof(fd_mask);
1945
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001946 /* perhaps check sz < nalloc/2 and shrink? */
1947 if (*readsetp == NULL || sz > *nallocp) {
Damien Miller36812092006-03-26 14:22:47 +11001948 *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask));
1949 *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask));
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001950 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001951 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001952 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001953 memset(*readsetp, 0, sz);
1954 memset(*writesetp, 0, sz);
1955
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001956 if (!rekeying)
1957 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001958}
1959
Ben Lindstrome9c99912001-06-09 00:41:05 +00001960/*
1961 * After select, perform any appropriate operations for channels which have
1962 * events pending.
1963 */
Damien Miller4af51302000-04-16 11:18:38 +10001964void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001965channel_after_select(fd_set *readset, fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001966{
Damien Millerb38eff82000-04-01 11:09:21 +10001967 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001968}
1969
Ben Lindstrome9c99912001-06-09 00:41:05 +00001970
Damien Miller5e953212001-01-30 09:14:00 +11001971/* If there is data to send to the connection, enqueue some of it now. */
Damien Miller4af51302000-04-16 11:18:38 +10001972void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001973channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001974{
Damien Millerb38eff82000-04-01 11:09:21 +10001975 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001976 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001977
Damien Miller95def091999-11-25 00:26:21 +11001978 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001979 c = channels[i];
1980 if (c == NULL)
1981 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001982
Ben Lindstrome9c99912001-06-09 00:41:05 +00001983 /*
1984 * We are only interested in channels that can have buffered
1985 * incoming data.
1986 */
Damien Miller34132e52000-01-14 15:45:46 +11001987 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001988 if (c->type != SSH_CHANNEL_OPEN &&
1989 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001990 continue;
1991 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001992 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001993 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001994 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001995 if (compat20 &&
1996 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001997 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001998 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001999 continue;
2000 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002001
Damien Miller95def091999-11-25 00:26:21 +11002002 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002003 if ((c->istate == CHAN_INPUT_OPEN ||
2004 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
2005 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11002006 if (c->datagram) {
2007 if (len > 0) {
2008 u_char *data;
2009 u_int dlen;
2010
2011 data = buffer_get_string(&c->input,
2012 &dlen);
2013 packet_start(SSH2_MSG_CHANNEL_DATA);
2014 packet_put_int(c->remote_id);
2015 packet_put_string(data, dlen);
2016 packet_send();
2017 c->remote_window -= dlen + 4;
2018 xfree(data);
2019 }
2020 continue;
2021 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002022 /*
2023 * Send some data for the other side over the secure
2024 * connection.
2025 */
Damien Miller33b13562000-04-04 14:38:59 +10002026 if (compat20) {
2027 if (len > c->remote_window)
2028 len = c->remote_window;
2029 if (len > c->remote_maxpacket)
2030 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11002031 } else {
Damien Miller33b13562000-04-04 14:38:59 +10002032 if (packet_is_interactive()) {
2033 if (len > 1024)
2034 len = 512;
2035 } else {
2036 /* Keep the packets at reasonable size. */
2037 if (len > packet_get_maxsize()/2)
2038 len = packet_get_maxsize()/2;
2039 }
Damien Miller95def091999-11-25 00:26:21 +11002040 }
Damien Millerb38eff82000-04-01 11:09:21 +10002041 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10002042 packet_start(compat20 ?
2043 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10002044 packet_put_int(c->remote_id);
2045 packet_put_string(buffer_ptr(&c->input), len);
2046 packet_send();
2047 buffer_consume(&c->input, len);
2048 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10002049 }
2050 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11002051 if (compat13)
2052 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11002053 /*
2054 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00002055 * tell peer, that we will not send more data: send IEOF.
2056 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11002057 */
Ben Lindstromcf159442002-03-26 03:26:24 +00002058 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10002059 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
2060 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00002061 else
2062 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11002063 }
Damien Miller33b13562000-04-04 14:38:59 +10002064 /* Send extended data, i.e. stderr */
2065 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00002066 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10002067 c->remote_window > 0 &&
2068 (len = buffer_len(&c->extended)) > 0 &&
2069 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002070 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002071 c->self, c->remote_window, buffer_len(&c->extended),
2072 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10002073 if (len > c->remote_window)
2074 len = c->remote_window;
2075 if (len > c->remote_maxpacket)
2076 len = c->remote_maxpacket;
2077 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
2078 packet_put_int(c->remote_id);
2079 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
2080 packet_put_string(buffer_ptr(&c->extended), len);
2081 packet_send();
2082 buffer_consume(&c->extended, len);
2083 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002084 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10002085 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002086 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002087}
2088
Ben Lindstrome9c99912001-06-09 00:41:05 +00002089
2090/* -- protocol input */
Damien Millerd79b4242006-03-31 23:11:44 +11002091
2092/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002093void
Damien Miller630d6f42002-01-22 23:17:30 +11002094channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002095{
Damien Miller34132e52000-01-14 15:45:46 +11002096 int id;
Damien Miller95def091999-11-25 00:26:21 +11002097 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00002098 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10002099 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002100
Damien Miller95def091999-11-25 00:26:21 +11002101 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11002102 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10002103 c = channel_lookup(id);
2104 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11002105 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002106
Damien Miller95def091999-11-25 00:26:21 +11002107 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10002108 if (c->type != SSH_CHANNEL_OPEN &&
2109 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002110 return;
2111
Damien Miller95def091999-11-25 00:26:21 +11002112 /* Get the data. */
Damien Millerdb255ca2008-05-19 14:59:37 +10002113 data = packet_get_string_ptr(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10002114
Damien Millera04ad492004-01-21 11:02:09 +11002115 /*
2116 * Ignore data for protocol > 1.3 if output end is no longer open.
2117 * For protocol 2 the sending side is reducing its window as it sends
2118 * data, so we must 'fake' consumption of the data in order to ensure
2119 * that window updates are sent back. Otherwise the connection might
2120 * deadlock.
2121 */
2122 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
2123 if (compat20) {
2124 c->local_window -= data_len;
2125 c->local_consumed += data_len;
2126 }
Damien Millera04ad492004-01-21 11:02:09 +11002127 return;
2128 }
2129
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002130 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10002131 if (data_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10002132 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller33b13562000-04-04 14:38:59 +10002133 c->self, data_len, c->local_maxpacket);
2134 }
2135 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002136 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002137 c->self, data_len, c->local_window);
Damien Miller33b13562000-04-04 14:38:59 +10002138 return;
2139 }
2140 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10002141 }
Damien Millerd27b9472005-12-13 19:29:02 +11002142 if (c->datagram)
2143 buffer_put_string(&c->output, data, data_len);
2144 else
2145 buffer_append(&c->output, data, data_len);
Damien Millerdb255ca2008-05-19 14:59:37 +10002146 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002147}
Ben Lindstrome9c99912001-06-09 00:41:05 +00002148
Damien Millerd79b4242006-03-31 23:11:44 +11002149/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002150void
Damien Miller630d6f42002-01-22 23:17:30 +11002151channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002152{
2153 int id;
Damien Miller33b13562000-04-04 14:38:59 +10002154 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00002155 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10002156 Channel *c;
2157
2158 /* Get the channel number and verify it. */
2159 id = packet_get_int();
2160 c = channel_lookup(id);
2161
2162 if (c == NULL)
2163 packet_disconnect("Received extended_data for bad channel %d.", id);
2164 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002165 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10002166 return;
2167 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002168 if (c->flags & CHAN_EOF_RCVD) {
2169 if (datafellows & SSH_BUG_EXTEOF)
2170 debug("channel %d: accepting ext data after eof", id);
2171 else
2172 packet_disconnect("Received extended_data after EOF "
2173 "on channel %d.", id);
2174 }
Damien Miller33b13562000-04-04 14:38:59 +10002175 tcode = packet_get_int();
2176 if (c->efd == -1 ||
2177 c->extended_usage != CHAN_EXTENDED_WRITE ||
2178 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002179 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002180 return;
2181 }
2182 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002183 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002184 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002185 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002186 c->self, data_len, c->local_window);
2187 xfree(data);
2188 return;
2189 }
Damien Millerd3444942000-09-30 14:20:03 +11002190 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002191 c->local_window -= data_len;
2192 buffer_append(&c->extended, data, data_len);
2193 xfree(data);
2194}
2195
Damien Millerd79b4242006-03-31 23:11:44 +11002196/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002197void
Damien Miller630d6f42002-01-22 23:17:30 +11002198channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002199{
2200 int id;
2201 Channel *c;
2202
Damien Millerb38eff82000-04-01 11:09:21 +10002203 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002204 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002205 c = channel_lookup(id);
2206 if (c == NULL)
2207 packet_disconnect("Received ieof for nonexistent channel %d.", id);
2208 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002209
2210 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002211 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002212 debug("channel %d: FORCE input drain", c->self);
2213 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002214 if (buffer_len(&c->input) == 0)
2215 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002216 }
2217
Damien Millerb38eff82000-04-01 11:09:21 +10002218}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002219
Damien Millerd79b4242006-03-31 23:11:44 +11002220/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002221void
Damien Miller630d6f42002-01-22 23:17:30 +11002222channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002223{
Damien Millerb38eff82000-04-01 11:09:21 +10002224 int id;
2225 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002226
Damien Millerb38eff82000-04-01 11:09:21 +10002227 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002228 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002229 c = channel_lookup(id);
2230 if (c == NULL)
2231 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002232
2233 /*
2234 * Send a confirmation that we have closed the channel and no more
2235 * data is coming for it.
2236 */
Damien Miller95def091999-11-25 00:26:21 +11002237 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002238 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002239 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002240
Damien Miller5428f641999-11-25 11:54:57 +11002241 /*
2242 * If the channel is in closed state, we have sent a close request,
2243 * and the other side will eventually respond with a confirmation.
2244 * Thus, we cannot free the channel here, because then there would be
2245 * no-one to receive the confirmation. The channel gets freed when
2246 * the confirmation arrives.
2247 */
Damien Millerb38eff82000-04-01 11:09:21 +10002248 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002249 /*
2250 * Not a closed channel - mark it as draining, which will
2251 * cause it to be freed later.
2252 */
Damien Miller76765c02002-01-22 23:21:15 +11002253 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002254 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002255 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002256}
2257
Damien Millerb38eff82000-04-01 11:09:21 +10002258/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Millerd79b4242006-03-31 23:11:44 +11002259/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002260void
Damien Miller630d6f42002-01-22 23:17:30 +11002261channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002262{
Damien Millerb38eff82000-04-01 11:09:21 +10002263 int id = packet_get_int();
2264 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002265
Damien Miller48b03fc2002-01-22 23:11:40 +11002266 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002267 if (c == NULL)
2268 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2269 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002270}
2271
Damien Millerd79b4242006-03-31 23:11:44 +11002272/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002273void
Damien Miller630d6f42002-01-22 23:17:30 +11002274channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002275{
2276 int id = packet_get_int();
2277 Channel *c = channel_lookup(id);
2278
Damien Miller48b03fc2002-01-22 23:11:40 +11002279 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002280 if (c == NULL)
2281 packet_disconnect("Received close confirmation for "
2282 "out-of-range channel %d.", id);
2283 if (c->type != SSH_CHANNEL_CLOSED)
2284 packet_disconnect("Received close confirmation for "
2285 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002286 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002287}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002288
Damien Millerd79b4242006-03-31 23:11:44 +11002289/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002290void
Damien Miller630d6f42002-01-22 23:17:30 +11002291channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002292{
Damien Millerb38eff82000-04-01 11:09:21 +10002293 int id, remote_id;
2294 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002295
Damien Millerb38eff82000-04-01 11:09:21 +10002296 id = packet_get_int();
2297 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002298
Damien Millerb38eff82000-04-01 11:09:21 +10002299 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2300 packet_disconnect("Received open confirmation for "
2301 "non-opening channel %d.", id);
2302 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002303 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002304 c->remote_id = remote_id;
2305 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002306
2307 if (compat20) {
2308 c->remote_window = packet_get_int();
2309 c->remote_maxpacket = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002310 if (c->open_confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002311 debug2("callback start");
Damien Millerb84886b2008-05-19 15:05:07 +10002312 c->open_confirm(c->self, c->open_confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002313 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002314 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002315 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002316 c->remote_window, c->remote_maxpacket);
2317 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002318 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002319}
2320
Ben Lindstrombba81212001-06-25 05:01:22 +00002321static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002322reason2txt(int reason)
2323{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002324 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002325 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2326 return "administratively prohibited";
2327 case SSH2_OPEN_CONNECT_FAILED:
2328 return "connect failed";
2329 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2330 return "unknown channel type";
2331 case SSH2_OPEN_RESOURCE_SHORTAGE:
2332 return "resource shortage";
2333 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002334 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002335}
2336
Damien Millerd79b4242006-03-31 23:11:44 +11002337/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002338void
Damien Miller630d6f42002-01-22 23:17:30 +11002339channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002340{
Kevin Steves12057502001-02-05 14:54:34 +00002341 int id, reason;
2342 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002343 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002344
Damien Millerb38eff82000-04-01 11:09:21 +10002345 id = packet_get_int();
2346 c = channel_lookup(id);
2347
2348 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2349 packet_disconnect("Received open failure for "
2350 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002351 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002352 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002353 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002354 msg = packet_get_string(NULL);
2355 lang = packet_get_string(NULL);
2356 }
Damien Miller996acd22003-04-09 20:59:48 +10002357 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002358 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002359 if (msg != NULL)
2360 xfree(msg);
2361 if (lang != NULL)
2362 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10002363 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002364 packet_check_eom();
Damien Miller7a606212009-01-28 16:22:34 +11002365 /* Schedule the channel for cleanup/deletion. */
2366 chan_mark_dead(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002367}
2368
Damien Millerd79b4242006-03-31 23:11:44 +11002369/* ARGSUSED */
Damien Miller33b13562000-04-04 14:38:59 +10002370void
Damien Miller630d6f42002-01-22 23:17:30 +11002371channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002372{
2373 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002374 int id;
2375 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002376
2377 if (!compat20)
2378 return;
2379
2380 /* Get the channel number and verify it. */
2381 id = packet_get_int();
2382 c = channel_lookup(id);
2383
Damien Millerd47c62a2005-12-13 19:33:57 +11002384 if (c == NULL) {
2385 logit("Received window adjust for non-open channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002386 return;
2387 }
2388 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002389 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002390 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002391 c->remote_window += adjust;
2392}
2393
Damien Millerd79b4242006-03-31 23:11:44 +11002394/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002395void
Damien Miller630d6f42002-01-22 23:17:30 +11002396channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002397{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002398 Channel *c = NULL;
2399 u_short host_port;
2400 char *host, *originator_string;
Damien Millerbd740252008-05-19 15:37:09 +10002401 int remote_id;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002402
Ben Lindstrome9c99912001-06-09 00:41:05 +00002403 remote_id = packet_get_int();
2404 host = packet_get_string(NULL);
2405 host_port = packet_get_int();
2406
2407 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2408 originator_string = packet_get_string(NULL);
2409 } else {
2410 originator_string = xstrdup("unknown (remote did not supply name)");
2411 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002412 packet_check_eom();
Damien Millerbd740252008-05-19 15:37:09 +10002413 c = channel_connect_to(host, host_port,
2414 "connected socket", originator_string);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002415 xfree(originator_string);
Damien Millerbd740252008-05-19 15:37:09 +10002416 xfree(host);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002417 if (c == NULL) {
2418 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2419 packet_put_int(remote_id);
2420 packet_send();
Damien Millerbd740252008-05-19 15:37:09 +10002421 } else
2422 c->remote_id = remote_id;
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002423}
2424
Damien Millerb84886b2008-05-19 15:05:07 +10002425/* ARGSUSED */
2426void
2427channel_input_status_confirm(int type, u_int32_t seq, void *ctxt)
2428{
2429 Channel *c;
2430 struct channel_confirm *cc;
Damien Miller16a73072008-12-08 09:55:25 +11002431 int id;
Damien Millerb84886b2008-05-19 15:05:07 +10002432
2433 /* Reset keepalive timeout */
Darren Tuckerf7288d72009-06-21 18:12:20 +10002434 packet_set_alive_timeouts(0);
Damien Millerb84886b2008-05-19 15:05:07 +10002435
Damien Miller16a73072008-12-08 09:55:25 +11002436 id = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002437 packet_check_eom();
2438
Damien Miller16a73072008-12-08 09:55:25 +11002439 debug2("channel_input_status_confirm: type %d id %d", type, id);
Damien Millerb84886b2008-05-19 15:05:07 +10002440
Damien Miller16a73072008-12-08 09:55:25 +11002441 if ((c = channel_lookup(id)) == NULL) {
2442 logit("channel_input_status_confirm: %d: unknown", id);
Damien Millerb84886b2008-05-19 15:05:07 +10002443 return;
2444 }
2445 ;
2446 if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
2447 return;
2448 cc->cb(type, c, cc->ctx);
2449 TAILQ_REMOVE(&c->status_confirms, cc, entry);
2450 bzero(cc, sizeof(*cc));
2451 xfree(cc);
2452}
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002453
Ben Lindstrome9c99912001-06-09 00:41:05 +00002454/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002455
Ben Lindstrom908afed2001-10-03 17:34:59 +00002456void
2457channel_set_af(int af)
2458{
2459 IPv4or6 = af;
2460}
2461
Damien Millerb16461c2002-01-22 23:29:22 +11002462static int
Damien Miller4bf648f2009-02-14 16:28:21 +11002463channel_setup_fwd_listener(int type, const char *listen_addr,
2464 u_short listen_port, int *allocated_listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002465 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002466{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002467 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002468 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002469 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002470 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002471 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller4bf648f2009-02-14 16:28:21 +11002472 in_port_t *lport_p;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002473
Damien Millerb16461c2002-01-22 23:29:22 +11002474 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2475 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002476 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002477
Damien Millerb16461c2002-01-22 23:29:22 +11002478 if (host == NULL) {
2479 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002480 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002481 }
Damien Miller9576ac42009-01-28 16:30:33 +11002482 if (strlen(host) >= NI_MAXHOST) {
Kevin Steves12057502001-02-05 14:54:34 +00002483 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002484 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002485 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002486
Damien Miller5428f641999-11-25 11:54:57 +11002487 /*
Damien Millerf91ee4c2005-03-01 21:24:33 +11002488 * Determine whether or not a port forward listens to loopback,
Darren Tucker47eede72005-03-14 23:08:12 +11002489 * specified address or wildcard. On the client, a specified bind
2490 * address will always override gateway_ports. On the server, a
2491 * gateway_ports of 1 (``yes'') will override the client's
2492 * specification and force a wildcard bind, whereas a value of 2
2493 * (``clientspecified'') will bind to whatever address the client
Damien Millerf91ee4c2005-03-01 21:24:33 +11002494 * asked for.
2495 *
2496 * Special-case listen_addrs are:
2497 *
2498 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2499 * "" (empty string), "*" -> wildcard v4/v6
2500 * "localhost" -> loopback v4/v6
2501 */
2502 addr = NULL;
2503 if (listen_addr == NULL) {
2504 /* No address specified: default to gateway_ports setting */
2505 if (gateway_ports)
2506 wildcard = 1;
2507 } else if (gateway_ports || is_client) {
2508 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
Damien Miller3de49f82008-02-10 22:25:24 +11002509 strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
Damien Millerf91ee4c2005-03-01 21:24:33 +11002510 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2511 (!is_client && gateway_ports == 1))
2512 wildcard = 1;
2513 else if (strcmp(listen_addr, "localhost") != 0)
2514 addr = listen_addr;
2515 }
2516
2517 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2518 type, wildcard, (addr == NULL) ? "NULL" : addr);
2519
2520 /*
Damien Miller34132e52000-01-14 15:45:46 +11002521 * getaddrinfo returns a loopback address if the hostname is
2522 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002523 */
Damien Miller34132e52000-01-14 15:45:46 +11002524 memset(&hints, 0, sizeof(hints));
2525 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002526 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002527 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002528 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002529 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2530 if (addr == NULL) {
2531 /* This really shouldn't happen */
2532 packet_disconnect("getaddrinfo: fatal error: %s",
Darren Tucker4abde772007-12-29 02:43:51 +11002533 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002534 } else {
Damien Millera7270302005-07-06 09:36:05 +10002535 error("channel_setup_fwd_listener: "
Darren Tucker4abde772007-12-29 02:43:51 +11002536 "getaddrinfo(%.64s): %s", addr,
2537 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002538 }
Damien Millera7270302005-07-06 09:36:05 +10002539 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002540 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002541 if (allocated_listen_port != NULL)
2542 *allocated_listen_port = 0;
Damien Miller34132e52000-01-14 15:45:46 +11002543 for (ai = aitop; ai; ai = ai->ai_next) {
Damien Miller4bf648f2009-02-14 16:28:21 +11002544 switch (ai->ai_family) {
2545 case AF_INET:
2546 lport_p = &((struct sockaddr_in *)ai->ai_addr)->
2547 sin_port;
2548 break;
2549 case AF_INET6:
2550 lport_p = &((struct sockaddr_in6 *)ai->ai_addr)->
2551 sin6_port;
2552 break;
2553 default:
Damien Miller34132e52000-01-14 15:45:46 +11002554 continue;
Damien Miller4bf648f2009-02-14 16:28:21 +11002555 }
2556 /*
2557 * If allocating a port for -R forwards, then use the
2558 * same port for all address families.
2559 */
2560 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2561 allocated_listen_port != NULL && *allocated_listen_port > 0)
2562 *lport_p = htons(*allocated_listen_port);
2563
Damien Miller34132e52000-01-14 15:45:46 +11002564 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2565 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002566 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002567 continue;
2568 }
2569 /* Create a port to listen for the host. */
Damien Miller2372ace2003-05-14 13:42:23 +10002570 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002571 if (sock < 0) {
2572 /* this is no error since kernel may not support ipv6 */
2573 verbose("socket: %.100s", strerror(errno));
2574 continue;
2575 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002576
2577 channel_set_reuseaddr(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002578
Damien Miller4bf648f2009-02-14 16:28:21 +11002579 debug("Local forwarding listening on %s port %s.",
2580 ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002581
Damien Miller34132e52000-01-14 15:45:46 +11002582 /* Bind the socket to the address. */
2583 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2584 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002585 if (!ai->ai_next)
2586 error("bind: %.100s", strerror(errno));
2587 else
2588 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002589
Damien Miller34132e52000-01-14 15:45:46 +11002590 close(sock);
2591 continue;
2592 }
2593 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002594 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002595 error("listen: %.100s", strerror(errno));
2596 close(sock);
2597 continue;
2598 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002599
2600 /*
2601 * listen_port == 0 requests a dynamically allocated port -
2602 * record what we got.
2603 */
2604 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2605 allocated_listen_port != NULL &&
2606 *allocated_listen_port == 0) {
2607 *allocated_listen_port = get_sock_port(sock, 1);
2608 debug("Allocated listen port %d",
2609 *allocated_listen_port);
2610 }
2611
Damien Miller34132e52000-01-14 15:45:46 +11002612 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002613 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002614 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002615 0, "port listener", 1);
Damien Millera1c1b6c2009-01-28 16:29:49 +11002616 c->path = xstrdup(host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002617 c->host_port = port_to_connect;
2618 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002619 success = 1;
2620 }
2621 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002622 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002623 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002624 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002625 return success;
Damien Miller95def091999-11-25 00:26:21 +11002626}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002627
Darren Tuckere7066df2004-05-24 10:18:05 +10002628int
2629channel_cancel_rport_listener(const char *host, u_short port)
2630{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002631 u_int i;
2632 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002633
Darren Tucker47eede72005-03-14 23:08:12 +11002634 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002635 Channel *c = channels[i];
2636
2637 if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
Damien Millera1c1b6c2009-01-28 16:29:49 +11002638 strcmp(c->path, host) == 0 && c->listening_port == port) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002639 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002640 channel_free(c);
2641 found = 1;
2642 }
2643 }
2644
2645 return (found);
2646}
2647
Damien Millerb16461c2002-01-22 23:29:22 +11002648/* protocol local port fwd, used by ssh (and sshd in v1) */
2649int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002650channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002651 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2652{
2653 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002654 listen_host, listen_port, NULL, host_to_connect, port_to_connect,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002655 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002656}
2657
2658/* protocol v2 remote port fwd, used by sshd */
2659int
2660channel_setup_remote_fwd_listener(const char *listen_address,
Damien Miller4bf648f2009-02-14 16:28:21 +11002661 u_short listen_port, int *allocated_listen_port, int gateway_ports)
Damien Millerb16461c2002-01-22 23:29:22 +11002662{
2663 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002664 listen_address, listen_port, allocated_listen_port,
2665 NULL, 0, gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002666}
2667
Damien Miller5428f641999-11-25 11:54:57 +11002668/*
2669 * Initiate forwarding of connections to port "port" on remote host through
2670 * the secure channel to host:port from local side.
2671 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002672
Darren Tuckere7d4b192006-07-12 22:17:10 +10002673int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002674channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002675 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002676{
Damien Millerdff50992002-01-22 23:16:32 +11002677 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002678
Damien Miller95def091999-11-25 00:26:21 +11002679 /* Record locally that connection to this host/port is permitted. */
2680 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2681 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002682
Damien Miller95def091999-11-25 00:26:21 +11002683 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002684 if (compat20) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11002685 const char *address_to_bind;
Damien Miller1ec46262007-01-05 16:26:45 +11002686 if (listen_host == NULL) {
2687 if (datafellows & SSH_BUG_RFWD_ADDR)
2688 address_to_bind = "127.0.0.1";
2689 else
2690 address_to_bind = "localhost";
2691 } else if (*listen_host == '\0' ||
2692 strcmp(listen_host, "*") == 0) {
2693 if (datafellows & SSH_BUG_RFWD_ADDR)
2694 address_to_bind = "0.0.0.0";
2695 else
2696 address_to_bind = "";
2697 } else
Damien Millerf91ee4c2005-03-01 21:24:33 +11002698 address_to_bind = listen_host;
2699
Damien Miller33b13562000-04-04 14:38:59 +10002700 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2701 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002702 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002703 packet_put_cstring(address_to_bind);
2704 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002705 packet_send();
2706 packet_write_wait();
2707 /* Assume that server accepts the request */
2708 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002709 } else {
2710 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002711 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002712 packet_put_cstring(host_to_connect);
2713 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002714 packet_send();
2715 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002716
2717 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002718 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002719 switch (type) {
2720 case SSH_SMSG_SUCCESS:
2721 success = 1;
2722 break;
2723 case SSH_SMSG_FAILURE:
Damien Miller0bc1bd82000-11-13 22:57:25 +11002724 break;
2725 default:
2726 /* Unknown packet */
2727 packet_disconnect("Protocol error for port forward request:"
2728 "received packet type %d.", type);
2729 }
2730 }
2731 if (success) {
2732 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2733 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2734 permitted_opens[num_permitted_opens].listen_port = listen_port;
2735 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002736 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10002737 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002738}
2739
Damien Miller5428f641999-11-25 11:54:57 +11002740/*
Darren Tuckerfc959702004-07-17 16:12:08 +10002741 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10002742 * local side.
2743 */
Darren Tuckere7066df2004-05-24 10:18:05 +10002744void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002745channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10002746{
2747 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10002748
2749 if (!compat20)
2750 return;
2751
2752 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10002753 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10002754 permitted_opens[i].listen_port == port)
2755 break;
2756 }
2757 if (i >= num_permitted_opens) {
2758 debug("%s: requested forward not found", __func__);
2759 return;
2760 }
2761 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2762 packet_put_cstring("cancel-tcpip-forward");
2763 packet_put_char(0);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002764 packet_put_cstring(host == NULL ? "" : host);
Darren Tuckere7066df2004-05-24 10:18:05 +10002765 packet_put_int(port);
2766 packet_send();
2767
2768 permitted_opens[i].listen_port = 0;
2769 permitted_opens[i].port_to_connect = 0;
Damien Miller0a0176e2005-11-05 15:07:59 +11002770 xfree(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10002771 permitted_opens[i].host_to_connect = NULL;
2772}
2773
2774/*
Damien Miller5428f641999-11-25 11:54:57 +11002775 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2776 * listening for the port, and sends back a success reply (or disconnect
Darren Tuckere7d4b192006-07-12 22:17:10 +10002777 * message if there was an error).
Damien Miller5428f641999-11-25 11:54:57 +11002778 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10002779int
Damien Millere247cc42000-05-07 12:03:14 +10002780channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002781{
Damien Milleraae6c611999-12-06 11:47:28 +11002782 u_short port, host_port;
Darren Tuckere7d4b192006-07-12 22:17:10 +10002783 int success = 0;
Damien Miller95def091999-11-25 00:26:21 +11002784 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002785
Damien Miller95def091999-11-25 00:26:21 +11002786 /* Get arguments from the packet. */
2787 port = packet_get_int();
2788 hostname = packet_get_string(NULL);
2789 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002790
Damien Millerbac2d8a2000-09-05 16:13:06 +11002791#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002792 /*
2793 * Check that an unprivileged user is not trying to forward a
2794 * privileged port.
2795 */
Damien Miller95def091999-11-25 00:26:21 +11002796 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10002797 packet_disconnect(
2798 "Requested forwarding of port %d but user is not root.",
2799 port);
2800 if (host_port == 0)
2801 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11002802#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10002803
Damien Miller0bc1bd82000-11-13 22:57:25 +11002804 /* Initiate forwarding */
Darren Tuckere7d4b192006-07-12 22:17:10 +10002805 success = channel_setup_local_fwd_listener(NULL, port, hostname,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002806 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002807
2808 /* Free the argument string. */
2809 xfree(hostname);
Darren Tuckere7d4b192006-07-12 22:17:10 +10002810
2811 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002812}
2813
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002814/*
2815 * Permits opening to any host/port if permitted_opens[] is empty. This is
2816 * usually called by the server, because the user could connect to any port
2817 * anyway, and the server has no way to know but to trust the client anyway.
2818 */
2819void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002820channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002821{
2822 if (num_permitted_opens == 0)
2823 all_opens_permitted = 1;
2824}
2825
Ben Lindstroma3700052001-04-05 23:26:32 +00002826void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002827channel_add_permitted_opens(char *host, int port)
2828{
2829 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
Darren Tuckere7d4b192006-07-12 22:17:10 +10002830 fatal("channel_add_permitted_opens: too many forwards");
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002831 debug("allow port forwarding to host %s port %d", host, port);
2832
2833 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2834 permitted_opens[num_permitted_opens].port_to_connect = port;
2835 num_permitted_opens++;
2836
2837 all_opens_permitted = 0;
2838}
2839
Damien Millera765cf42006-07-24 14:08:13 +10002840int
Damien Miller9b439df2006-07-24 14:04:00 +10002841channel_add_adm_permitted_opens(char *host, int port)
2842{
2843 if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2844 fatal("channel_add_adm_permitted_opens: too many forwards");
Damien Millera765cf42006-07-24 14:08:13 +10002845 debug("config allows port forwarding to host %s port %d", host, port);
Damien Miller9b439df2006-07-24 14:04:00 +10002846
2847 permitted_adm_opens[num_adm_permitted_opens].host_to_connect
2848 = xstrdup(host);
2849 permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
Damien Millera765cf42006-07-24 14:08:13 +10002850 return ++num_adm_permitted_opens;
Damien Miller9b439df2006-07-24 14:04:00 +10002851}
2852
2853void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002854channel_clear_permitted_opens(void)
2855{
2856 int i;
2857
2858 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002859 if (permitted_opens[i].host_to_connect != NULL)
2860 xfree(permitted_opens[i].host_to_connect);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002861 num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +10002862}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002863
Damien Miller9b439df2006-07-24 14:04:00 +10002864void
2865channel_clear_adm_permitted_opens(void)
2866{
2867 int i;
2868
2869 for (i = 0; i < num_adm_permitted_opens; i++)
2870 if (permitted_adm_opens[i].host_to_connect != NULL)
2871 xfree(permitted_adm_opens[i].host_to_connect);
2872 num_adm_permitted_opens = 0;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002873}
2874
Darren Tuckere7140f22008-06-10 23:01:51 +10002875void
2876channel_print_adm_permitted_opens(void)
2877{
Damien Miller6ef17492008-07-16 22:42:06 +10002878 int i;
Darren Tuckere7140f22008-06-10 23:01:51 +10002879
Damien Millerb53d8a12009-01-28 16:13:04 +11002880 printf("permitopen");
Darren Tucker22662e82008-11-11 16:40:22 +11002881 if (num_adm_permitted_opens == 0) {
Damien Millerb53d8a12009-01-28 16:13:04 +11002882 printf(" any\n");
Darren Tucker22662e82008-11-11 16:40:22 +11002883 return;
2884 }
Darren Tuckere7140f22008-06-10 23:01:51 +10002885 for (i = 0; i < num_adm_permitted_opens; i++)
2886 if (permitted_adm_opens[i].host_to_connect != NULL)
2887 printf(" %s:%d", permitted_adm_opens[i].host_to_connect,
2888 permitted_adm_opens[i].port_to_connect);
Damien Millerb53d8a12009-01-28 16:13:04 +11002889 printf("\n");
Darren Tuckere7140f22008-06-10 23:01:51 +10002890}
2891
Damien Millerbd740252008-05-19 15:37:09 +10002892/* Try to start non-blocking connect to next host in cctx list */
Ben Lindstrombba81212001-06-25 05:01:22 +00002893static int
Damien Millerbd740252008-05-19 15:37:09 +10002894connect_next(struct channel_connect *cctx)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002895{
Damien Millerbd740252008-05-19 15:37:09 +10002896 int sock, saved_errno;
Damien Miller34132e52000-01-14 15:45:46 +11002897 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller95def091999-11-25 00:26:21 +11002898
Damien Millerbd740252008-05-19 15:37:09 +10002899 for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
2900 if (cctx->ai->ai_family != AF_INET &&
2901 cctx->ai->ai_family != AF_INET6)
Damien Miller34132e52000-01-14 15:45:46 +11002902 continue;
Damien Millerbd740252008-05-19 15:37:09 +10002903 if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
2904 ntop, sizeof(ntop), strport, sizeof(strport),
2905 NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
2906 error("connect_next: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002907 continue;
2908 }
Damien Millerbd740252008-05-19 15:37:09 +10002909 if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
2910 cctx->ai->ai_protocol)) == -1) {
2911 if (cctx->ai->ai_next == NULL)
Damien Millerb46b9f32003-01-10 21:45:12 +11002912 error("socket: %.100s", strerror(errno));
2913 else
2914 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002915 continue;
2916 }
Damien Miller232711f2004-06-15 10:35:30 +10002917 if (set_nonblock(sock) == -1)
2918 fatal("%s: set_nonblock(%d)", __func__, sock);
Damien Millerbd740252008-05-19 15:37:09 +10002919 if (connect(sock, cctx->ai->ai_addr,
2920 cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
2921 debug("connect_next: host %.100s ([%.100s]:%s): "
2922 "%.100s", cctx->host, ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002923 strerror(errno));
Damien Millerbd740252008-05-19 15:37:09 +10002924 saved_errno = errno;
Damien Miller34132e52000-01-14 15:45:46 +11002925 close(sock);
Damien Millerbd740252008-05-19 15:37:09 +10002926 errno = saved_errno;
Kevin Stevesef4eea92001-02-05 12:42:17 +00002927 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002928 }
Damien Millerbd740252008-05-19 15:37:09 +10002929 debug("connect_next: host %.100s ([%.100s]:%s) "
2930 "in progress, fd=%d", cctx->host, ntop, strport, sock);
2931 cctx->ai = cctx->ai->ai_next;
2932 set_nodelay(sock);
2933 return sock;
Damien Miller34132e52000-01-14 15:45:46 +11002934 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11002935 return -1;
2936}
Damien Millerb38eff82000-04-01 11:09:21 +10002937
Damien Millerbd740252008-05-19 15:37:09 +10002938static void
2939channel_connect_ctx_free(struct channel_connect *cctx)
2940{
2941 xfree(cctx->host);
2942 if (cctx->aitop)
2943 freeaddrinfo(cctx->aitop);
2944 bzero(cctx, sizeof(*cctx));
2945 cctx->host = NULL;
2946 cctx->ai = cctx->aitop = NULL;
2947}
2948
2949/* Return CONNECTING channel to remote host, port */
2950static Channel *
2951connect_to(const char *host, u_short port, char *ctype, char *rname)
2952{
2953 struct addrinfo hints;
2954 int gaierr;
2955 int sock = -1;
2956 char strport[NI_MAXSERV];
2957 struct channel_connect cctx;
2958 Channel *c;
2959
Damien Miller2bcb8662008-07-12 17:12:29 +10002960 memset(&cctx, 0, sizeof(cctx));
Damien Millerbd740252008-05-19 15:37:09 +10002961 memset(&hints, 0, sizeof(hints));
2962 hints.ai_family = IPv4or6;
2963 hints.ai_socktype = SOCK_STREAM;
2964 snprintf(strport, sizeof strport, "%d", port);
2965 if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) {
2966 error("connect_to %.100s: unknown host (%s)", host,
2967 ssh_gai_strerror(gaierr));
2968 return NULL;
2969 }
2970
2971 cctx.host = xstrdup(host);
2972 cctx.port = port;
2973 cctx.ai = cctx.aitop;
2974
2975 if ((sock = connect_next(&cctx)) == -1) {
2976 error("connect to %.100s port %d failed: %s",
2977 host, port, strerror(errno));
2978 channel_connect_ctx_free(&cctx);
2979 return NULL;
2980 }
2981 c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
2982 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
2983 c->connect_ctx = cctx;
2984 return c;
2985}
2986
2987Channel *
2988channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname)
2989{
2990 int i;
2991
2992 for (i = 0; i < num_permitted_opens; i++) {
2993 if (permitted_opens[i].host_to_connect != NULL &&
2994 permitted_opens[i].listen_port == listen_port) {
2995 return connect_to(
2996 permitted_opens[i].host_to_connect,
2997 permitted_opens[i].port_to_connect, ctype, rname);
2998 }
2999 }
3000 error("WARNING: Server requests forwarding for unknown listen_port %d",
3001 listen_port);
3002 return NULL;
3003}
3004
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003005/* Check if connecting to that port is permitted and connect. */
Damien Millerbd740252008-05-19 15:37:09 +10003006Channel *
3007channel_connect_to(const char *host, u_short port, char *ctype, char *rname)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003008{
Damien Miller9b439df2006-07-24 14:04:00 +10003009 int i, permit, permit_adm = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003010
3011 permit = all_opens_permitted;
3012 if (!permit) {
3013 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10003014 if (permitted_opens[i].host_to_connect != NULL &&
3015 permitted_opens[i].port_to_connect == port &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003016 strcmp(permitted_opens[i].host_to_connect, host) == 0)
3017 permit = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003018 }
Damien Miller9b439df2006-07-24 14:04:00 +10003019
3020 if (num_adm_permitted_opens > 0) {
3021 permit_adm = 0;
3022 for (i = 0; i < num_adm_permitted_opens; i++)
3023 if (permitted_adm_opens[i].host_to_connect != NULL &&
3024 permitted_adm_opens[i].port_to_connect == port &&
3025 strcmp(permitted_adm_opens[i].host_to_connect, host)
3026 == 0)
3027 permit_adm = 1;
3028 }
3029
3030 if (!permit || !permit_adm) {
Damien Miller996acd22003-04-09 20:59:48 +10003031 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003032 "but the request was denied.", host, port);
Damien Millerbd740252008-05-19 15:37:09 +10003033 return NULL;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003034 }
Damien Millerbd740252008-05-19 15:37:09 +10003035 return connect_to(host, port, ctype, rname);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003036}
3037
Damien Miller0e220db2004-06-15 10:34:08 +10003038void
3039channel_send_window_changes(void)
3040{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10003041 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10003042 struct winsize ws;
3043
3044 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11003045 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10003046 channels[i]->type != SSH_CHANNEL_OPEN)
3047 continue;
3048 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
3049 continue;
3050 channel_request_start(i, "window-change", 0);
Damien Miller71a73672006-03-26 14:04:36 +11003051 packet_put_int((u_int)ws.ws_col);
3052 packet_put_int((u_int)ws.ws_row);
3053 packet_put_int((u_int)ws.ws_xpixel);
3054 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10003055 packet_send();
3056 }
3057}
3058
Ben Lindstrome9c99912001-06-09 00:41:05 +00003059/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003060
Damien Miller5428f641999-11-25 11:54:57 +11003061/*
3062 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003063 * Returns 0 and a suitable display number for the DISPLAY variable
3064 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11003065 */
Kevin Steves366298c2001-12-19 17:58:01 +00003066int
Damien Miller95c249f2002-02-05 12:11:34 +11003067x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10003068 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003069{
Damien Millere7378562001-12-21 14:58:35 +11003070 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11003071 int display_number, sock;
3072 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11003073 struct addrinfo hints, *ai, *aitop;
3074 char strport[NI_MAXSERV];
3075 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003076
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003077 if (chanids == NULL)
3078 return -1;
3079
Damien Millera34a28b1999-12-14 10:47:15 +11003080 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11003081 display_number < MAX_DISPLAYS;
3082 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11003083 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11003084 memset(&hints, 0, sizeof(hints));
3085 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11003086 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11003087 hints.ai_socktype = SOCK_STREAM;
3088 snprintf(strport, sizeof strport, "%d", port);
3089 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003090 error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00003091 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003092 }
Damien Miller34132e52000-01-14 15:45:46 +11003093 for (ai = aitop; ai; ai = ai->ai_next) {
3094 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
3095 continue;
Damien Miller2372ace2003-05-14 13:42:23 +10003096 sock = socket(ai->ai_family, ai->ai_socktype,
3097 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003098 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11003099 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11003100 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10003101 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00003102 return -1;
Damien Millere2192732000-01-17 13:22:55 +11003103 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11003104 debug("x11_create_display_inet: Socket family %d not supported",
3105 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11003106 continue;
3107 }
Damien Miller34132e52000-01-14 15:45:46 +11003108 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00003109#ifdef IPV6_V6ONLY
3110 if (ai->ai_family == AF_INET6) {
3111 int on = 1;
3112 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
3113 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
3114 }
3115#endif
Damien Miller4401e452008-06-12 06:05:12 +10003116 if (x11_use_localhost)
3117 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11003118 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003119 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003120 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11003121
Damien Miller34132e52000-01-14 15:45:46 +11003122 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11003123 close(socks[n]);
3124 }
3125 num_socks = 0;
3126 break;
3127 }
3128 socks[num_socks++] = sock;
3129 if (num_socks == NUM_SOCKS)
3130 break;
Damien Miller95def091999-11-25 00:26:21 +11003131 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00003132 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11003133 if (num_socks > 0)
3134 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003135 }
Damien Miller95def091999-11-25 00:26:21 +11003136 if (display_number >= MAX_DISPLAYS) {
3137 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00003138 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003139 }
Damien Miller95def091999-11-25 00:26:21 +11003140 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11003141 for (n = 0; n < num_socks; n++) {
3142 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11003143 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11003144 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003145 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00003146 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11003147 }
Damien Miller95def091999-11-25 00:26:21 +11003148 }
Damien Miller34132e52000-01-14 15:45:46 +11003149
Damien Miller34132e52000-01-14 15:45:46 +11003150 /* Allocate a channel for each socket. */
Damien Miller07d86be2006-03-26 14:19:21 +11003151 *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
Damien Miller34132e52000-01-14 15:45:46 +11003152 for (n = 0; n < num_socks; n++) {
3153 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11003154 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10003155 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
3156 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003157 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11003158 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003159 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11003160 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003161 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003162
Kevin Steves366298c2001-12-19 17:58:01 +00003163 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003164 *display_numberp = display_number;
3165 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003166}
3167
Ben Lindstrombba81212001-06-25 05:01:22 +00003168static int
Damien Miller819dbb62009-01-21 16:46:26 +11003169connect_local_xsocket_path(const char *pathname)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003170{
Damien Miller95def091999-11-25 00:26:21 +11003171 int sock;
3172 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003173
Damien Miller3afe3752001-12-21 12:39:51 +11003174 sock = socket(AF_UNIX, SOCK_STREAM, 0);
3175 if (sock < 0)
3176 error("socket: %.100s", strerror(errno));
3177 memset(&addr, 0, sizeof(addr));
3178 addr.sun_family = AF_UNIX;
Damien Miller819dbb62009-01-21 16:46:26 +11003179 strlcpy(addr.sun_path, pathname, sizeof addr.sun_path);
Damien Miller90967402006-03-26 14:07:26 +11003180 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
Damien Miller3afe3752001-12-21 12:39:51 +11003181 return sock;
3182 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11003183 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
3184 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003185}
3186
Damien Miller819dbb62009-01-21 16:46:26 +11003187static int
3188connect_local_xsocket(u_int dnr)
3189{
3190 char buf[1024];
3191 snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr);
3192 return connect_local_xsocket_path(buf);
3193}
3194
Damien Millerbd483e72000-04-30 10:00:53 +10003195int
3196x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003197{
Damien Miller57c4e872006-03-31 23:11:07 +11003198 u_int display_number;
Damien Miller95def091999-11-25 00:26:21 +11003199 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10003200 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11003201 struct addrinfo hints, *ai, *aitop;
3202 char strport[NI_MAXSERV];
Damien Miller57c4e872006-03-31 23:11:07 +11003203 int gaierr, sock = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003204
Damien Miller95def091999-11-25 00:26:21 +11003205 /* Try to open a socket for the local X server. */
3206 display = getenv("DISPLAY");
3207 if (!display) {
3208 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10003209 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003210 }
Damien Miller5428f641999-11-25 11:54:57 +11003211 /*
3212 * Now we decode the value of the DISPLAY variable and make a
3213 * connection to the real X server.
3214 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003215
Damien Miller819dbb62009-01-21 16:46:26 +11003216 /* Check if the display is from launchd. */
3217#ifdef __APPLE__
3218 if (strncmp(display, "/tmp/launch", 11) == 0) {
3219 sock = connect_local_xsocket_path(display);
3220 if (sock < 0)
3221 return -1;
3222
3223 /* OK, we now have a connection to the display. */
3224 return sock;
3225 }
3226#endif
Damien Miller5428f641999-11-25 11:54:57 +11003227 /*
3228 * Check if it is a unix domain socket. Unix domain displays are in
3229 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
3230 */
Damien Miller95def091999-11-25 00:26:21 +11003231 if (strncmp(display, "unix:", 5) == 0 ||
3232 display[0] == ':') {
3233 /* Connect to the unix domain socket. */
Damien Miller57c4e872006-03-31 23:11:07 +11003234 if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003235 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003236 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003237 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003238 }
3239 /* Create a socket. */
3240 sock = connect_local_xsocket(display_number);
3241 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10003242 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003243
3244 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10003245 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003246 }
Damien Miller5428f641999-11-25 11:54:57 +11003247 /*
3248 * Connect to an inet socket. The DISPLAY value is supposedly
3249 * hostname:d[.s], where hostname may also be numeric IP address.
3250 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00003251 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11003252 cp = strchr(buf, ':');
3253 if (!cp) {
3254 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10003255 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003256 }
Damien Miller95def091999-11-25 00:26:21 +11003257 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11003258 /* buf now contains the host name. But first we parse the display number. */
Damien Miller57c4e872006-03-31 23:11:07 +11003259 if (sscanf(cp + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003260 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003261 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003262 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003263 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003264
Damien Miller34132e52000-01-14 15:45:46 +11003265 /* Look up the host address */
3266 memset(&hints, 0, sizeof(hints));
3267 hints.ai_family = IPv4or6;
3268 hints.ai_socktype = SOCK_STREAM;
Damien Miller57c4e872006-03-31 23:11:07 +11003269 snprintf(strport, sizeof strport, "%u", 6000 + display_number);
Damien Miller34132e52000-01-14 15:45:46 +11003270 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003271 error("%.100s: unknown host. (%s)", buf,
3272 ssh_gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10003273 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003274 }
Damien Miller34132e52000-01-14 15:45:46 +11003275 for (ai = aitop; ai; ai = ai->ai_next) {
3276 /* Create a socket. */
Damien Miller2372ace2003-05-14 13:42:23 +10003277 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003278 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003279 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10003280 continue;
3281 }
3282 /* Connect it to the display. */
3283 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Miller57c4e872006-03-31 23:11:07 +11003284 debug2("connect %.100s port %u: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10003285 6000 + display_number, strerror(errno));
3286 close(sock);
3287 continue;
3288 }
3289 /* Success */
3290 break;
Damien Miller34132e52000-01-14 15:45:46 +11003291 }
Damien Miller34132e52000-01-14 15:45:46 +11003292 freeaddrinfo(aitop);
3293 if (!ai) {
Damien Miller57c4e872006-03-31 23:11:07 +11003294 error("connect %.100s port %u: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11003295 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10003296 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003297 }
Damien Miller398e1cf2002-02-05 11:52:13 +11003298 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10003299 return sock;
3300}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003301
Damien Millerbd483e72000-04-30 10:00:53 +10003302/*
3303 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
3304 * the remote channel number. We should do whatever we want, and respond
3305 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
3306 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003307
Damien Miller8473dd82006-07-24 14:08:32 +10003308/* ARGSUSED */
Damien Millerbd483e72000-04-30 10:00:53 +10003309void
Damien Miller630d6f42002-01-22 23:17:30 +11003310x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10003311{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003312 Channel *c = NULL;
3313 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10003314 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10003315
3316 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003317
3318 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00003319
3320 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003321 remote_host = packet_get_string(NULL);
3322 } else {
3323 remote_host = xstrdup("unknown (remote did not supply name)");
3324 }
Damien Miller48b03fc2002-01-22 23:11:40 +11003325 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10003326
3327 /* Obtain a connection to the real X display. */
3328 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003329 if (sock != -1) {
3330 /* Allocate a channel for this connection. */
3331 c = channel_new("connected x11 socket",
3332 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3333 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11003334 c->remote_id = remote_id;
3335 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003336 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003337 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003338 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10003339 /* Send refusal to the remote host. */
3340 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003341 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10003342 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10003343 /* Send a confirmation to the remote host. */
3344 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003345 packet_put_int(remote_id);
3346 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10003347 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003348 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003349}
3350
Damien Miller69b69aa2000-10-28 14:19:58 +11003351/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
Damien Miller8473dd82006-07-24 14:08:32 +10003352/* ARGSUSED */
Damien Miller69b69aa2000-10-28 14:19:58 +11003353void
Damien Miller630d6f42002-01-22 23:17:30 +11003354deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11003355{
3356 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00003357
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00003358 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11003359 case SSH_SMSG_AGENT_OPEN:
3360 error("Warning: ssh server tried agent forwarding.");
3361 break;
3362 case SSH_SMSG_X11_OPEN:
3363 error("Warning: ssh server tried X11 forwarding.");
3364 break;
3365 default:
Damien Miller630d6f42002-01-22 23:17:30 +11003366 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11003367 break;
3368 }
Damien Miller5eb137c2005-12-31 16:19:53 +11003369 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11003370 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3371 packet_put_int(rchan);
3372 packet_send();
3373}
3374
Damien Miller5428f641999-11-25 11:54:57 +11003375/*
3376 * Requests forwarding of X11 connections, generates fake authentication
3377 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00003378 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11003379 */
Damien Miller4af51302000-04-16 11:18:38 +10003380void
Damien Miller17e7ed02005-06-17 12:54:33 +10003381x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Millerbd483e72000-04-30 10:00:53 +10003382 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003383{
Ben Lindstrom46c16222000-12-22 01:43:59 +00003384 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10003385 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11003386 char *new_data;
3387 int screen_number;
3388 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10003389 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003390
Damien Millerf92c0792005-07-06 09:45:26 +10003391 if (x11_saved_display == NULL)
3392 x11_saved_display = xstrdup(disp);
3393 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10003394 error("x11_request_forwarding_with_spoofing: different "
3395 "$DISPLAY already forwarded");
3396 return;
3397 }
3398
Damien Millerd5fe0ba2006-08-30 11:07:39 +10003399 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11003400 if (cp)
3401 cp = strchr(cp, '.');
3402 if (cp)
Damien Miller08d61502006-03-26 14:28:32 +11003403 screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
Damien Miller95def091999-11-25 00:26:21 +11003404 else
3405 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003406
Damien Miller13390022005-07-06 09:44:19 +10003407 if (x11_saved_proto == NULL) {
3408 /* Save protocol name. */
3409 x11_saved_proto = xstrdup(proto);
3410 /*
Damien Miller46d38de2005-07-17 17:02:09 +10003411 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10003412 * of the same length.
3413 */
3414 x11_saved_data = xmalloc(data_len);
3415 x11_fake_data = xmalloc(data_len);
3416 for (i = 0; i < data_len; i++) {
3417 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3418 fatal("x11_request_forwarding: bad "
3419 "authentication data: %.100s", data);
3420 if (i % 4 == 0)
3421 rnd = arc4random();
3422 x11_saved_data[i] = value;
3423 x11_fake_data[i] = rnd & 0xff;
3424 rnd >>= 8;
3425 }
3426 x11_saved_data_len = data_len;
3427 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003428 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003429
Damien Miller95def091999-11-25 00:26:21 +11003430 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003431 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003432
Damien Miller95def091999-11-25 00:26:21 +11003433 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003434 if (compat20) {
3435 channel_request_start(client_session_id, "x11-req", 0);
3436 packet_put_char(0); /* XXX bool single connection */
3437 } else {
3438 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3439 }
3440 packet_put_cstring(proto);
3441 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003442 packet_put_int(screen_number);
3443 packet_send();
3444 packet_write_wait();
3445 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003446}
3447
Ben Lindstrome9c99912001-06-09 00:41:05 +00003448
3449/* -- agent forwarding */
3450
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003451/* Sends a message to the server to request authentication fd forwarding. */
3452
Damien Miller4af51302000-04-16 11:18:38 +10003453void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003454auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003455{
Damien Miller95def091999-11-25 00:26:21 +11003456 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3457 packet_send();
3458 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003459}