blob: 7d0439e68a913b5823b399e87a5c33d67fe9bd88 [file] [log] [blame]
Damien Miller4b3ed642014-07-02 15:29:40 +10001/* $OpenBSD: channels.c,v 1.333 2014/06/27 16:41:56 markus 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>
Darren Tucker6e7fe1c2010-01-08 17:07:22 +110056#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100057#include <netdb.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100058#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100059#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100060#include <string.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110061#include <termios.h>
Damien Millere6b3b612006-07-24 14:01:23 +100062#include <unistd.h>
Damien Millerd7834352006-08-05 12:39:39 +100063#include <stdarg.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064
Damien Millerb84886b2008-05-19 15:05:07 +100065#include "openbsd-compat/sys-queue.h"
Damien Millerd7834352006-08-05 12:39:39 +100066#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100067#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000068#include "ssh1.h"
69#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100070#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000071#include "log.h"
72#include "misc.h"
Damien Millerd7834352006-08-05 12:39:39 +100073#include "buffer.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100074#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000076#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100077#include "key.h"
78#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110079#include "pathnames.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080
Ben Lindstrome9c99912001-06-09 00:41:05 +000081/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100082
Damien Miller5428f641999-11-25 11:54:57 +110083/*
84 * Pointer to an array containing all allocated channels. The array is
85 * dynamically extended as needed.
86 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000087static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100088
Damien Miller5428f641999-11-25 11:54:57 +110089/*
90 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000091 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110092 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100093static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094
Damien Miller5428f641999-11-25 11:54:57 +110095/*
96 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000097 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110098 */
Damien Miller5e953212001-01-30 09:14:00 +110099static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000101
Ben Lindstrome9c99912001-06-09 00:41:05 +0000102/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000103
Damien Miller5428f641999-11-25 11:54:57 +1100104/*
105 * Data structure for storing which hosts are permitted for forward requests.
106 * The local sides of any remote forwards are stored in this array to prevent
107 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
108 * network (which might be behind a firewall).
109 */
Damien Miller95def091999-11-25 00:26:21 +1100110typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +1000111 char *host_to_connect; /* Connect to 'host'. */
112 u_short port_to_connect; /* Connect to 'port'. */
Damien Miller4b3ed642014-07-02 15:29:40 +1000113 char *listen_host; /* Remote side should listen address. */
114 u_short listen_port; /* Remote side should listen port. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000115} ForwardPermission;
116
Damien Miller9b439df2006-07-24 14:04:00 +1000117/* List of all permitted host/port pairs to connect by the user. */
Damien Miller232cfb12010-06-26 09:50:30 +1000118static ForwardPermission *permitted_opens = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000119
Damien Miller9b439df2006-07-24 14:04:00 +1000120/* List of all permitted host/port pairs to connect by the admin. */
Damien Miller232cfb12010-06-26 09:50:30 +1000121static ForwardPermission *permitted_adm_opens = NULL;
Damien Miller9b439df2006-07-24 14:04:00 +1000122
123/* Number of permitted host/port pairs in the array permitted by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000124static int num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +1000125
126/* Number of permitted host/port pair in the array permitted by the admin. */
127static int num_adm_permitted_opens = 0;
128
Darren Tucker1338b9e2011-10-02 18:57:35 +1100129/* special-case port number meaning allow any port */
130#define FWD_PERMIT_ANY_PORT 0
131
Damien Miller5428f641999-11-25 11:54:57 +1100132/*
133 * If this is true, all opens are permitted. This is the case on the server
134 * on which we have to trust the client anyway, and the user could do
135 * anything after logging in anyway.
136 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000137static int all_opens_permitted = 0;
138
Ben Lindstrome9c99912001-06-09 00:41:05 +0000139
140/* -- X11 forwarding */
141
142/* Maximum number of fake X11 displays to try. */
143#define MAX_DISPLAYS 1000
144
Damien Miller13390022005-07-06 09:44:19 +1000145/* Saved X11 local (client) display. */
146static char *x11_saved_display = NULL;
147
Ben Lindstrome9c99912001-06-09 00:41:05 +0000148/* Saved X11 authentication protocol name. */
149static char *x11_saved_proto = NULL;
150
151/* Saved X11 authentication data. This is the real data. */
152static char *x11_saved_data = NULL;
153static u_int x11_saved_data_len = 0;
154
155/*
156 * Fake X11 authentication data. This is what the server will be sending us;
157 * we should replace any occurrences of this by the real data.
158 */
Damien Miller4ae97f12006-03-26 14:08:10 +1100159static u_char *x11_fake_data = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000160static u_int x11_fake_data_len;
161
162
163/* -- agent forwarding */
164
165#define NUM_SOCKS 10
166
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000167/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000168static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000169
Ben Lindstrome9c99912001-06-09 00:41:05 +0000170/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000171static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000172
Damien Millerbd740252008-05-19 15:37:09 +1000173/* non-blocking connect helpers */
174static int connect_next(struct channel_connect *);
175static void channel_connect_ctx_free(struct channel_connect *);
176
Ben Lindstrome9c99912001-06-09 00:41:05 +0000177/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000178
179Channel *
Damien Millerd47c62a2005-12-13 19:33:57 +1100180channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000181{
182 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000183
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000184 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100185 logit("channel_by_id: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000186 return NULL;
187 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000188 c = channels[id];
189 if (c == NULL) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100190 logit("channel_by_id: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000191 return NULL;
192 }
193 return c;
194}
195
Damien Miller5428f641999-11-25 11:54:57 +1100196/*
Damien Millerd47c62a2005-12-13 19:33:57 +1100197 * Returns the channel if it is allowed to receive protocol messages.
198 * Private channels, like listening sockets, may not receive messages.
199 */
200Channel *
201channel_lookup(int id)
202{
203 Channel *c;
204
205 if ((c = channel_by_id(id)) == NULL)
206 return (NULL);
207
Damien Millerd62f2ca2006-03-26 13:57:41 +1100208 switch (c->type) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100209 case SSH_CHANNEL_X11_OPEN:
210 case SSH_CHANNEL_LARVAL:
211 case SSH_CHANNEL_CONNECTING:
212 case SSH_CHANNEL_DYNAMIC:
213 case SSH_CHANNEL_OPENING:
214 case SSH_CHANNEL_OPEN:
215 case SSH_CHANNEL_INPUT_DRAINING:
216 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller36187092013-06-10 13:07:11 +1000217 case SSH_CHANNEL_ABANDONED:
Damien Millerd47c62a2005-12-13 19:33:57 +1100218 return (c);
Damien Millerd47c62a2005-12-13 19:33:57 +1100219 }
220 logit("Non-public channel %d, type %d.", id, c->type);
221 return (NULL);
222}
223
224/*
Damien Millere247cc42000-05-07 12:03:14 +1000225 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000226 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100227 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000228static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100229channel_register_fds(Channel *c, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000230 int extusage, int nonblock, int is_tty)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000231{
Damien Miller95def091999-11-25 00:26:21 +1100232 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100233 channel_max_fd = MAX(channel_max_fd, rfd);
234 channel_max_fd = MAX(channel_max_fd, wfd);
235 channel_max_fd = MAX(channel_max_fd, efd);
236
Darren Tucker6e7fe1c2010-01-08 17:07:22 +1100237 if (rfd != -1)
238 fcntl(rfd, F_SETFD, FD_CLOEXEC);
239 if (wfd != -1 && wfd != rfd)
240 fcntl(wfd, F_SETFD, FD_CLOEXEC);
241 if (efd != -1 && efd != rfd && efd != wfd)
242 fcntl(efd, F_SETFD, FD_CLOEXEC);
Damien Millere247cc42000-05-07 12:03:14 +1000243
Damien Miller6f83b8e2000-05-02 09:23:45 +1000244 c->rfd = rfd;
245 c->wfd = wfd;
246 c->sock = (rfd == wfd) ? rfd : -1;
247 c->efd = efd;
248 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100249
Darren Tuckered3cdc02008-06-16 23:29:18 +1000250 if ((c->isatty = is_tty) != 0)
Damien Millerfbdeece2003-09-02 22:52:31 +1000251 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Millerc192a4c2013-08-01 14:29:20 +1000252#ifdef _AIX
253 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker1a48aec2008-06-16 23:35:56 +1000254 c->wfd_isatty = is_tty || isatty(c->wfd);
Damien Millerc192a4c2013-08-01 14:29:20 +1000255#endif
Damien Miller79438cc2001-02-16 12:34:57 +1100256
Damien Miller69b69aa2000-10-28 14:19:58 +1100257 /* enable nonblocking mode */
258 if (nonblock) {
259 if (rfd != -1)
260 set_nonblock(rfd);
261 if (wfd != -1)
262 set_nonblock(wfd);
263 if (efd != -1)
264 set_nonblock(efd);
265 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000266}
267
268/*
269 * Allocate a new channel object and set its type and socket. This will cause
270 * remote_name to be freed.
271 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000272Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000273channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000274 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000275{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000276 int found;
277 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000278 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000279
Damien Miller95def091999-11-25 00:26:21 +1100280 /* Do initial allocation if this is the first call. */
281 if (channels_alloc == 0) {
282 channels_alloc = 10;
Damien Miller07d86be2006-03-26 14:19:21 +1100283 channels = xcalloc(channels_alloc, sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100284 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000285 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100286 }
287 /* Try to find a free slot where to put the new channel. */
288 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000289 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100290 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000291 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100292 break;
293 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000294 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100295 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100296 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000297 if (channels_alloc > 10000)
298 fatal("channel_new: internal error: channels_alloc %d "
299 "too big.", channels_alloc);
Damien Miller36812092006-03-26 14:22:47 +1100300 channels = xrealloc(channels, channels_alloc + 10,
301 sizeof(Channel *));
Damien Miller5efcecc2003-09-17 07:31:14 +1000302 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100303 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100304 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000305 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100306 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000307 /* Initialize and return new channel. */
Damien Miller07d86be2006-03-26 14:19:21 +1100308 c = channels[found] = xcalloc(1, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100309 buffer_init(&c->input);
310 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000311 buffer_init(&c->extended);
Damien Millera1c1b6c2009-01-28 16:29:49 +1100312 c->path = NULL;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000313 c->listening_addr = NULL;
314 c->listening_port = 0;
Damien Miller5144df92002-01-22 23:28:45 +1100315 c->ostate = CHAN_OUTPUT_OPEN;
316 c->istate = CHAN_INPUT_OPEN;
317 c->flags = 0;
Damien Millerd310d512008-06-16 07:59:23 +1000318 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0);
Damien Millera6508752012-04-22 11:21:10 +1000319 c->notbefore = 0;
Damien Miller95def091999-11-25 00:26:21 +1100320 c->self = found;
321 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000322 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000323 c->local_window = window;
324 c->local_window_max = window;
325 c->local_consumed = 0;
326 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100327 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000328 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000329 c->remote_window = 0;
330 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000331 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100332 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000333 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100334 c->detach_close = 0;
Damien Millerb84886b2008-05-19 15:05:07 +1000335 c->open_confirm = NULL;
336 c->open_confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000337 c->input_filter = NULL;
Damien Miller077b2382005-12-31 16:22:32 +1100338 c->output_filter = NULL;
Darren Tucker84c56f52008-06-13 04:55:46 +1000339 c->filter_ctx = NULL;
340 c->filter_cleanup = NULL;
Damien Millere1537f92010-01-26 13:26:22 +1100341 c->ctl_chan = -1;
342 c->mux_rcb = NULL;
343 c->mux_ctx = NULL;
Damien Millerd530f5f2010-05-21 14:57:10 +1000344 c->mux_pause = 0;
Darren Tucker876045b2010-01-08 17:08:00 +1100345 c->delayed = 1; /* prevent call to channel_post handler */
Damien Millerb84886b2008-05-19 15:05:07 +1000346 TAILQ_INIT(&c->status_confirms);
Damien Miller95def091999-11-25 00:26:21 +1100347 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000348 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000349}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000350
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000351static int
352channel_find_maxfd(void)
353{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000354 u_int i;
355 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000356 Channel *c;
357
358 for (i = 0; i < channels_alloc; i++) {
359 c = channels[i];
360 if (c != NULL) {
361 max = MAX(max, c->rfd);
362 max = MAX(max, c->wfd);
363 max = MAX(max, c->efd);
364 }
365 }
366 return max;
367}
368
369int
370channel_close_fd(int *fdp)
371{
372 int ret = 0, fd = *fdp;
373
374 if (fd != -1) {
375 ret = close(fd);
376 *fdp = -1;
377 if (fd == channel_max_fd)
378 channel_max_fd = channel_find_maxfd();
379 }
380 return ret;
381}
382
Damien Miller6f83b8e2000-05-02 09:23:45 +1000383/* Close all channel fd/socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000384static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000385channel_close_fds(Channel *c)
386{
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000387 channel_close_fd(&c->sock);
388 channel_close_fd(&c->rfd);
389 channel_close_fd(&c->wfd);
390 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000391}
392
393/* Free the channel and close its fd/socket. */
Damien Miller4af51302000-04-16 11:18:38 +1000394void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000395channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000396{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000397 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000398 u_int i, n;
Damien Millerb84886b2008-05-19 15:05:07 +1000399 struct channel_confirm *cc;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000400
401 for (n = 0, i = 0; i < channels_alloc; i++)
402 if (channels[i])
403 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000404 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000405 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000406
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000407 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000408 debug3("channel %d: status: %s", c->self, s);
Darren Tuckera627d422013-06-02 07:31:17 +1000409 free(s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000410
Damien Miller6f83b8e2000-05-02 09:23:45 +1000411 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000412 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000413 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000414 buffer_free(&c->input);
415 buffer_free(&c->output);
416 buffer_free(&c->extended);
Darren Tuckera627d422013-06-02 07:31:17 +1000417 free(c->remote_name);
418 c->remote_name = NULL;
419 free(c->path);
420 c->path = NULL;
421 free(c->listening_addr);
422 c->listening_addr = NULL;
Damien Millerb84886b2008-05-19 15:05:07 +1000423 while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
424 if (cc->abandon_cb != NULL)
425 cc->abandon_cb(c, cc->ctx);
426 TAILQ_REMOVE(&c->status_confirms, cc, entry);
Damien Miller1d2c4562014-02-04 11:18:20 +1100427 explicit_bzero(cc, sizeof(*cc));
Darren Tuckera627d422013-06-02 07:31:17 +1000428 free(cc);
Damien Millerb84886b2008-05-19 15:05:07 +1000429 }
Darren Tucker84c56f52008-06-13 04:55:46 +1000430 if (c->filter_cleanup != NULL && c->filter_ctx != NULL)
431 c->filter_cleanup(c->self, c->filter_ctx);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000432 channels[c->self] = NULL;
Darren Tuckera627d422013-06-02 07:31:17 +1000433 free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000434}
435
Ben Lindstrome9c99912001-06-09 00:41:05 +0000436void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000437channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000438{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000439 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000440
Ben Lindstrom601e4362001-06-21 03:19:23 +0000441 for (i = 0; i < channels_alloc; i++)
442 if (channels[i] != NULL)
443 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000444}
445
446/*
447 * Closes the sockets/fds of all channels. This is used to close extra file
448 * descriptors after a fork.
449 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000450void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000451channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000452{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000453 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000454
455 for (i = 0; i < channels_alloc; i++)
456 if (channels[i] != NULL)
457 channel_close_fds(channels[i]);
458}
459
460/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000461 * Stop listening to channels.
462 */
Ben Lindstrom809744e2001-07-04 05:26:06 +0000463void
464channel_stop_listening(void)
465{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000466 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000467 Channel *c;
468
469 for (i = 0; i < channels_alloc; i++) {
470 c = channels[i];
471 if (c != NULL) {
472 switch (c->type) {
473 case SSH_CHANNEL_AUTH_SOCKET:
474 case SSH_CHANNEL_PORT_LISTENER:
475 case SSH_CHANNEL_RPORT_LISTENER:
476 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000477 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000478 channel_free(c);
479 break;
480 }
481 }
482 }
483}
484
485/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000486 * Returns true if no channel has too much buffered data, and false if one or
487 * more channel is overfull.
488 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000489int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000490channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000491{
492 u_int i;
493 Channel *c;
494
495 for (i = 0; i < channels_alloc; i++) {
496 c = channels[i];
497 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000498#if 0
499 if (!compat20 &&
500 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100501 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000502 c->self, buffer_len(&c->input));
503 return 0;
504 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000505#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000506 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000507 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000508 c->self, buffer_len(&c->output),
509 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000510 return 0;
511 }
512 }
513 }
514 return 1;
515}
516
517/* Returns true if any channel is still open. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000518int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000519channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000520{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000521 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000522 Channel *c;
523
524 for (i = 0; i < channels_alloc; i++) {
525 c = channels[i];
526 if (c == NULL)
527 continue;
528 switch (c->type) {
529 case SSH_CHANNEL_X11_LISTENER:
530 case SSH_CHANNEL_PORT_LISTENER:
531 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100532 case SSH_CHANNEL_MUX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000533 case SSH_CHANNEL_CLOSED:
534 case SSH_CHANNEL_AUTH_SOCKET:
535 case SSH_CHANNEL_DYNAMIC:
536 case SSH_CHANNEL_CONNECTING:
537 case SSH_CHANNEL_ZOMBIE:
Damien Miller36187092013-06-10 13:07:11 +1000538 case SSH_CHANNEL_ABANDONED:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000539 continue;
540 case SSH_CHANNEL_LARVAL:
541 if (!compat20)
542 fatal("cannot happen: SSH_CHANNEL_LARVAL");
543 continue;
544 case SSH_CHANNEL_OPENING:
545 case SSH_CHANNEL_OPEN:
546 case SSH_CHANNEL_X11_OPEN:
Damien Millere1537f92010-01-26 13:26:22 +1100547 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000548 return 1;
549 case SSH_CHANNEL_INPUT_DRAINING:
550 case SSH_CHANNEL_OUTPUT_DRAINING:
551 if (!compat13)
552 fatal("cannot happen: OUT_DRAIN");
553 return 1;
554 default:
555 fatal("channel_still_open: bad channel type %d", c->type);
556 /* NOTREACHED */
557 }
558 }
559 return 0;
560}
561
562/* Returns the id of an open channel suitable for keepaliving */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000563int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000564channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000565{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000566 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000567 Channel *c;
568
569 for (i = 0; i < channels_alloc; i++) {
570 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000571 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000572 continue;
573 switch (c->type) {
574 case SSH_CHANNEL_CLOSED:
575 case SSH_CHANNEL_DYNAMIC:
576 case SSH_CHANNEL_X11_LISTENER:
577 case SSH_CHANNEL_PORT_LISTENER:
578 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100579 case SSH_CHANNEL_MUX_LISTENER:
580 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000581 case SSH_CHANNEL_OPENING:
582 case SSH_CHANNEL_CONNECTING:
583 case SSH_CHANNEL_ZOMBIE:
Damien Miller36187092013-06-10 13:07:11 +1000584 case SSH_CHANNEL_ABANDONED:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000585 continue;
586 case SSH_CHANNEL_LARVAL:
587 case SSH_CHANNEL_AUTH_SOCKET:
588 case SSH_CHANNEL_OPEN:
589 case SSH_CHANNEL_X11_OPEN:
590 return i;
591 case SSH_CHANNEL_INPUT_DRAINING:
592 case SSH_CHANNEL_OUTPUT_DRAINING:
593 if (!compat13)
594 fatal("cannot happen: OUT_DRAIN");
595 return i;
596 default:
597 fatal("channel_find_open: bad channel type %d", c->type);
598 /* NOTREACHED */
599 }
600 }
601 return -1;
602}
603
604
605/*
606 * Returns a message describing the currently open forwarded connections,
607 * suitable for sending to the client. The message contains crlf pairs for
608 * newlines.
609 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000610char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000611channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000612{
613 Buffer buffer;
614 Channel *c;
615 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000616 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000617
618 buffer_init(&buffer);
619 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
620 buffer_append(&buffer, buf, strlen(buf));
621 for (i = 0; i < channels_alloc; i++) {
622 c = channels[i];
623 if (c == NULL)
624 continue;
625 switch (c->type) {
626 case SSH_CHANNEL_X11_LISTENER:
627 case SSH_CHANNEL_PORT_LISTENER:
628 case SSH_CHANNEL_RPORT_LISTENER:
629 case SSH_CHANNEL_CLOSED:
630 case SSH_CHANNEL_AUTH_SOCKET:
631 case SSH_CHANNEL_ZOMBIE:
Damien Miller36187092013-06-10 13:07:11 +1000632 case SSH_CHANNEL_ABANDONED:
Damien Millere1537f92010-01-26 13:26:22 +1100633 case SSH_CHANNEL_MUX_CLIENT:
634 case SSH_CHANNEL_MUX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000635 continue;
636 case SSH_CHANNEL_LARVAL:
637 case SSH_CHANNEL_OPENING:
638 case SSH_CHANNEL_CONNECTING:
639 case SSH_CHANNEL_DYNAMIC:
640 case SSH_CHANNEL_OPEN:
641 case SSH_CHANNEL_X11_OPEN:
642 case SSH_CHANNEL_INPUT_DRAINING:
643 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000644 snprintf(buf, sizeof buf,
Damien Millere1537f92010-01-26 13:26:22 +1100645 " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cc %d)\r\n",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000646 c->self, c->remote_name,
647 c->type, c->remote_id,
648 c->istate, buffer_len(&c->input),
649 c->ostate, buffer_len(&c->output),
Damien Millere1537f92010-01-26 13:26:22 +1100650 c->rfd, c->wfd, c->ctl_chan);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000651 buffer_append(&buffer, buf, strlen(buf));
652 continue;
653 default:
654 fatal("channel_open_message: bad channel type %d", c->type);
655 /* NOTREACHED */
656 }
657 }
658 buffer_append(&buffer, "\0", 1);
659 cp = xstrdup(buffer_ptr(&buffer));
660 buffer_free(&buffer);
661 return cp;
662}
663
664void
665channel_send_open(int id)
666{
667 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000668
Ben Lindstrome9c99912001-06-09 00:41:05 +0000669 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000670 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000671 return;
672 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000673 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000674 packet_start(SSH2_MSG_CHANNEL_OPEN);
675 packet_put_cstring(c->ctype);
676 packet_put_int(c->self);
677 packet_put_int(c->local_window);
678 packet_put_int(c->local_maxpacket);
679 packet_send();
680}
681
682void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000683channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000684{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000685 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000686
Ben Lindstrome9c99912001-06-09 00:41:05 +0000687 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000688 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000689 return;
690 }
Damien Miller0e220db2004-06-15 10:34:08 +1000691 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000692 packet_start(SSH2_MSG_CHANNEL_REQUEST);
693 packet_put_int(c->remote_id);
694 packet_put_cstring(service);
695 packet_put_char(wantconfirm);
696}
Damien Miller4f7becb2006-03-26 14:10:14 +1100697
Ben Lindstrome9c99912001-06-09 00:41:05 +0000698void
Damien Millerb84886b2008-05-19 15:05:07 +1000699channel_register_status_confirm(int id, channel_confirm_cb *cb,
700 channel_confirm_abandon_cb *abandon_cb, void *ctx)
701{
702 struct channel_confirm *cc;
703 Channel *c;
704
705 if ((c = channel_lookup(id)) == NULL)
706 fatal("channel_register_expect: %d: bad id", id);
707
Damien Miller6c81fee2013-11-08 12:19:55 +1100708 cc = xcalloc(1, sizeof(*cc));
Damien Millerb84886b2008-05-19 15:05:07 +1000709 cc->cb = cb;
710 cc->abandon_cb = abandon_cb;
711 cc->ctx = ctx;
712 TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry);
713}
714
715void
Damien Millerd530f5f2010-05-21 14:57:10 +1000716channel_register_open_confirm(int id, channel_open_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000717{
718 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000719
Ben Lindstrome9c99912001-06-09 00:41:05 +0000720 if (c == NULL) {
Damien Millera0094332008-11-03 19:26:35 +1100721 logit("channel_register_open_confirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000722 return;
723 }
Damien Millerb84886b2008-05-19 15:05:07 +1000724 c->open_confirm = fn;
725 c->open_confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000726}
Damien Miller4f7becb2006-03-26 14:10:14 +1100727
Ben Lindstrome9c99912001-06-09 00:41:05 +0000728void
Damien Miller39eda6e2005-11-05 14:52:50 +1100729channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000730{
Damien Millerd47c62a2005-12-13 19:33:57 +1100731 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000732
Ben Lindstrome9c99912001-06-09 00:41:05 +0000733 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000734 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000735 return;
736 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000737 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100738 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000739}
Damien Miller4f7becb2006-03-26 14:10:14 +1100740
Ben Lindstrome9c99912001-06-09 00:41:05 +0000741void
742channel_cancel_cleanup(int id)
743{
Damien Millerd47c62a2005-12-13 19:33:57 +1100744 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000745
Ben Lindstrome9c99912001-06-09 00:41:05 +0000746 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000747 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000748 return;
749 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000750 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100751 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000752}
Damien Miller4f7becb2006-03-26 14:10:14 +1100753
Ben Lindstrome9c99912001-06-09 00:41:05 +0000754void
Damien Miller077b2382005-12-31 16:22:32 +1100755channel_register_filter(int id, channel_infilter_fn *ifn,
Darren Tucker84c56f52008-06-13 04:55:46 +1000756 channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000757{
758 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000759
Ben Lindstrome9c99912001-06-09 00:41:05 +0000760 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000761 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000762 return;
763 }
Damien Miller077b2382005-12-31 16:22:32 +1100764 c->input_filter = ifn;
765 c->output_filter = ofn;
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000766 c->filter_ctx = ctx;
Darren Tucker84c56f52008-06-13 04:55:46 +1000767 c->filter_cleanup = cfn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000768}
769
770void
771channel_set_fds(int id, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000772 int extusage, int nonblock, int is_tty, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000773{
774 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000775
Ben Lindstrome9c99912001-06-09 00:41:05 +0000776 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
777 fatal("channel_activate for non-larval channel %d.", id);
Darren Tuckered3cdc02008-06-16 23:29:18 +1000778 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000779 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100780 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000781 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
782 packet_put_int(c->remote_id);
783 packet_put_int(c->local_window);
784 packet_send();
785}
786
Damien Miller5428f641999-11-25 11:54:57 +1100787/*
Damien Millerb38eff82000-04-01 11:09:21 +1000788 * 'channel_pre*' are called just before select() to add any bits relevant to
789 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100790 */
Damien Millerb38eff82000-04-01 11:09:21 +1000791/*
792 * 'channel_post*': perform any appropriate operations for channels which
793 * have events pending.
794 */
Damien Millerd62f2ca2006-03-26 13:57:41 +1100795typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000796chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
797chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
798
Damien Miller8473dd82006-07-24 14:08:32 +1000799/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000800static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100801channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000802{
803 FD_SET(c->sock, readset);
804}
805
Damien Miller8473dd82006-07-24 14:08:32 +1000806/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000807static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100808channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000809{
810 debug3("channel %d: waiting for connection", c->self);
811 FD_SET(c->sock, writeset);
812}
813
Ben Lindstrombba81212001-06-25 05:01:22 +0000814static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100815channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000816{
817 if (buffer_len(&c->input) < packet_get_maxsize())
818 FD_SET(c->sock, readset);
819 if (buffer_len(&c->output) > 0)
820 FD_SET(c->sock, writeset);
821}
822
Ben Lindstrombba81212001-06-25 05:01:22 +0000823static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100824channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000825{
Damien Millerde6987c2002-01-22 23:20:40 +1100826 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000827
Damien Miller33b13562000-04-04 14:38:59 +1000828 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100829 limit > 0 &&
Damien Miller499a0d52006-04-23 12:06:03 +1000830 buffer_len(&c->input) < limit &&
831 buffer_check_alloc(&c->input, CHAN_RBUF))
Damien Miller33b13562000-04-04 14:38:59 +1000832 FD_SET(c->rfd, readset);
833 if (c->ostate == CHAN_OUTPUT_OPEN ||
834 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
835 if (buffer_len(&c->output) > 0) {
836 FD_SET(c->wfd, writeset);
837 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000838 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000839 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
840 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000841 else
842 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000843 }
844 }
845 /** XXX check close conditions, too */
Damien Millerd654dd22008-05-19 16:05:41 +1000846 if (compat20 && c->efd != -1 &&
847 !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) {
Damien Miller33b13562000-04-04 14:38:59 +1000848 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
849 buffer_len(&c->extended) > 0)
850 FD_SET(c->efd, writeset);
Damien Miller8853ca52010-06-26 10:00:14 +1000851 else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT) &&
852 (c->extended_usage == CHAN_EXTENDED_READ ||
853 c->extended_usage == CHAN_EXTENDED_IGNORE) &&
Damien Miller33b13562000-04-04 14:38:59 +1000854 buffer_len(&c->extended) < c->remote_window)
855 FD_SET(c->efd, readset);
856 }
Damien Miller0e220db2004-06-15 10:34:08 +1000857 /* XXX: What about efd? races? */
Damien Miller33b13562000-04-04 14:38:59 +1000858}
859
Damien Miller8473dd82006-07-24 14:08:32 +1000860/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000861static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100862channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000863{
864 if (buffer_len(&c->input) == 0) {
865 packet_start(SSH_MSG_CHANNEL_CLOSE);
866 packet_put_int(c->remote_id);
867 packet_send();
868 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000869 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000870 }
871}
872
Damien Miller8473dd82006-07-24 14:08:32 +1000873/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000874static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100875channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000876{
877 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000878 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000879 else
Damien Millerb38eff82000-04-01 11:09:21 +1000880 FD_SET(c->sock, writeset);
881}
882
883/*
884 * This is a special state for X11 authentication spoofing. An opened X11
885 * connection (when authentication spoofing is being done) remains in this
886 * state until the first packet has been completely read. The authentication
887 * data in that packet is then substituted by the real data if it matches the
888 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000889 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000890 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000891 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000892static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000893x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000894{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000895 u_char *ucp;
896 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000897
898 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000899 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000900 return 0;
901
902 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100903 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000904 if (ucp[0] == 0x42) { /* Byte order MSB first. */
905 proto_len = 256 * ucp[6] + ucp[7];
906 data_len = 256 * ucp[8] + ucp[9];
907 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
908 proto_len = ucp[6] + 256 * ucp[7];
909 data_len = ucp[8] + 256 * ucp[9];
910 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000911 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100912 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000913 return -1;
914 }
915
916 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000917 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000918 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
919 return 0;
920
921 /* Check if authentication protocol matches. */
922 if (proto_len != strlen(x11_saved_proto) ||
923 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000924 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000925 return -1;
926 }
927 /* Check if authentication data matches our fake data. */
928 if (data_len != x11_fake_data_len ||
Damien Millerea1651c2010-07-16 13:58:37 +1000929 timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3),
Damien Millerb38eff82000-04-01 11:09:21 +1000930 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000931 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000932 return -1;
933 }
934 /* Check fake data length */
935 if (x11_fake_data_len != x11_saved_data_len) {
936 error("X11 fake_data_len %d != saved_data_len %d",
937 x11_fake_data_len, x11_saved_data_len);
938 return -1;
939 }
940 /*
941 * Received authentication protocol and data match
942 * our fake data. Substitute the fake data with real
943 * data.
944 */
945 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
946 x11_saved_data, x11_saved_data_len);
947 return 1;
948}
949
Ben Lindstrombba81212001-06-25 05:01:22 +0000950static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100951channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000952{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000953 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000954
Damien Millerb38eff82000-04-01 11:09:21 +1000955 if (ret == 1) {
956 /* Start normal processing for the channel. */
957 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000958 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000959 } else if (ret == -1) {
960 /*
961 * We have received an X11 connection that has bad
962 * authentication information.
963 */
Damien Miller996acd22003-04-09 20:59:48 +1000964 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000965 buffer_clear(&c->input);
966 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000967 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000968 c->sock = -1;
969 c->type = SSH_CHANNEL_CLOSED;
970 packet_start(SSH_MSG_CHANNEL_CLOSE);
971 packet_put_int(c->remote_id);
972 packet_send();
973 }
974}
975
Ben Lindstrombba81212001-06-25 05:01:22 +0000976static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100977channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000978{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000979 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000980
981 /* c->force_drain = 1; */
982
Damien Millerb38eff82000-04-01 11:09:21 +1000983 if (ret == 1) {
984 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100985 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000986 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000987 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000988 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100989 chan_read_failed(c);
990 buffer_clear(&c->input);
991 chan_ibuf_empty(c);
992 buffer_clear(&c->output);
993 /* for proto v1, the peer will send an IEOF */
994 if (compat20)
995 chan_write_failed(c);
996 else
997 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000998 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000999 }
1000}
1001
Damien Millere1537f92010-01-26 13:26:22 +11001002static void
1003channel_pre_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
1004{
Damien Millerd530f5f2010-05-21 14:57:10 +10001005 if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause &&
Damien Millere1537f92010-01-26 13:26:22 +11001006 buffer_check_alloc(&c->input, CHAN_RBUF))
1007 FD_SET(c->rfd, readset);
1008 if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1009 /* clear buffer immediately (discard any partial packet) */
1010 buffer_clear(&c->input);
1011 chan_ibuf_empty(c);
1012 /* Start output drain. XXX just kill chan? */
1013 chan_rcvd_oclose(c);
1014 }
1015 if (c->ostate == CHAN_OUTPUT_OPEN ||
1016 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1017 if (buffer_len(&c->output) > 0)
1018 FD_SET(c->wfd, writeset);
1019 else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN)
1020 chan_obuf_empty(c);
1021 }
1022}
1023
Ben Lindstromb3921512001-04-11 15:57:50 +00001024/* try to decode a socks4 header */
Damien Miller8473dd82006-07-24 14:08:32 +10001025/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001026static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001027channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001028{
Damien Millera10f5612002-09-12 09:49:15 +10001029 char *p, *host;
Damien Miller1781f532009-01-28 16:24:41 +11001030 u_int len, have, i, found, need;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001031 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001032 struct {
1033 u_int8_t version;
1034 u_int8_t command;
1035 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +00001036 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001037 } s4_req, s4_rsp;
1038
Ben Lindstromb3921512001-04-11 15:57:50 +00001039 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001040
1041 have = buffer_len(&c->input);
1042 len = sizeof(s4_req);
1043 if (have < len)
1044 return 0;
1045 p = buffer_ptr(&c->input);
Damien Miller1781f532009-01-28 16:24:41 +11001046
1047 need = 1;
1048 /* SOCKS4A uses an invalid IP address 0.0.0.x */
1049 if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) {
1050 debug2("channel %d: socks4a request", c->self);
1051 /* ... and needs an extra string (the hostname) */
1052 need = 2;
1053 }
1054 /* Check for terminating NUL on the string(s) */
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001055 for (found = 0, i = len; i < have; i++) {
1056 if (p[i] == '\0') {
Damien Miller1781f532009-01-28 16:24:41 +11001057 found++;
1058 if (found == need)
1059 break;
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001060 }
1061 if (i > 1024) {
1062 /* the peer is probably sending garbage */
1063 debug("channel %d: decode socks4: too long",
1064 c->self);
1065 return -1;
1066 }
1067 }
Damien Miller1781f532009-01-28 16:24:41 +11001068 if (found < need)
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001069 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001070 buffer_get(&c->input, (char *)&s4_req.version, 1);
1071 buffer_get(&c->input, (char *)&s4_req.command, 1);
1072 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +00001073 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001074 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001075 p = buffer_ptr(&c->input);
Damien Miller13481292014-02-27 10:18:32 +11001076 if (memchr(p, '\0', have) == NULL)
1077 fatal("channel %d: decode socks4: user not nul terminated",
1078 c->self);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001079 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001080 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Damien Miller1781f532009-01-28 16:24:41 +11001081 len++; /* trailing '\0' */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001082 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +00001083 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001084 c->self, len, have);
1085 strlcpy(username, p, sizeof(username));
1086 buffer_consume(&c->input, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001087
Darren Tuckera627d422013-06-02 07:31:17 +10001088 free(c->path);
1089 c->path = NULL;
Damien Miller1781f532009-01-28 16:24:41 +11001090 if (need == 1) { /* SOCKS4: one string */
1091 host = inet_ntoa(s4_req.dest_addr);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001092 c->path = xstrdup(host);
Damien Miller1781f532009-01-28 16:24:41 +11001093 } else { /* SOCKS4A: two strings */
1094 have = buffer_len(&c->input);
1095 p = buffer_ptr(&c->input);
1096 len = strlen(p);
1097 debug2("channel %d: decode socks4a: host %s/%d",
1098 c->self, p, len);
1099 len++; /* trailing '\0' */
1100 if (len > have)
1101 fatal("channel %d: decode socks4a: len %d > have %d",
1102 c->self, len, have);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001103 if (len > NI_MAXHOST) {
Damien Miller1781f532009-01-28 16:24:41 +11001104 error("channel %d: hostname \"%.100s\" too long",
1105 c->self, p);
1106 return -1;
1107 }
Damien Millera1c1b6c2009-01-28 16:29:49 +11001108 c->path = xstrdup(p);
Damien Miller1781f532009-01-28 16:24:41 +11001109 buffer_consume(&c->input, len);
1110 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001111 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001112
Damien Millerfbdeece2003-09-02 22:52:31 +10001113 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Damien Miller1781f532009-01-28 16:24:41 +11001114 c->self, c->path, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001115
Ben Lindstromb3921512001-04-11 15:57:50 +00001116 if (s4_req.command != 1) {
Damien Miller1781f532009-01-28 16:24:41 +11001117 debug("channel %d: cannot handle: %s cn %d",
1118 c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command);
Ben Lindstromb3921512001-04-11 15:57:50 +00001119 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001120 }
Ben Lindstromb3921512001-04-11 15:57:50 +00001121 s4_rsp.version = 0; /* vn: 0 for reply */
1122 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001123 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +00001124 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Damien Millera0fdce92006-03-26 14:28:50 +11001125 buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +00001126 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001127}
1128
Darren Tucker46471c92003-07-03 13:55:19 +10001129/* try to decode a socks5 header */
1130#define SSH_SOCKS5_AUTHDONE 0x1000
1131#define SSH_SOCKS5_NOAUTH 0x00
1132#define SSH_SOCKS5_IPV4 0x01
1133#define SSH_SOCKS5_DOMAIN 0x03
1134#define SSH_SOCKS5_IPV6 0x04
1135#define SSH_SOCKS5_CONNECT 0x01
1136#define SSH_SOCKS5_SUCCESS 0x00
1137
Damien Miller8473dd82006-07-24 14:08:32 +10001138/* ARGSUSED */
Darren Tucker46471c92003-07-03 13:55:19 +10001139static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001140channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
Darren Tucker46471c92003-07-03 13:55:19 +10001141{
1142 struct {
1143 u_int8_t version;
1144 u_int8_t command;
1145 u_int8_t reserved;
1146 u_int8_t atyp;
1147 } s5_req, s5_rsp;
1148 u_int16_t dest_port;
Damien Millerce986542013-07-18 16:12:44 +10001149 char dest_addr[255+1], ntop[INET6_ADDRSTRLEN];
1150 u_char *p;
Damien Miller0f077072006-07-10 22:21:02 +10001151 u_int have, need, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001152
1153 debug2("channel %d: decode socks5", c->self);
1154 p = buffer_ptr(&c->input);
1155 if (p[0] != 0x05)
1156 return -1;
1157 have = buffer_len(&c->input);
1158 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1159 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001160 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001161 return 0;
1162 nmethods = p[1];
1163 if (have < nmethods + 2)
1164 return 0;
1165 /* look for method: "NO AUTHENTICATION REQUIRED" */
Damien Miller80163902007-01-05 16:30:16 +11001166 for (found = 0, i = 2; i < nmethods + 2; i++) {
Damien Miller4dec5d72006-08-05 11:38:40 +10001167 if (p[i] == SSH_SOCKS5_NOAUTH) {
Darren Tucker46471c92003-07-03 13:55:19 +10001168 found = 1;
1169 break;
1170 }
1171 }
1172 if (!found) {
1173 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1174 c->self);
1175 return -1;
1176 }
1177 buffer_consume(&c->input, nmethods + 2);
1178 buffer_put_char(&c->output, 0x05); /* version */
1179 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1180 FD_SET(c->sock, writeset);
1181 c->flags |= SSH_SOCKS5_AUTHDONE;
1182 debug2("channel %d: socks5 auth done", c->self);
1183 return 0; /* need more */
1184 }
1185 debug2("channel %d: socks5 post auth", c->self);
1186 if (have < sizeof(s5_req)+1)
1187 return 0; /* need more */
Damien Millere3b21a52006-03-26 14:29:06 +11001188 memcpy(&s5_req, p, sizeof(s5_req));
Darren Tucker46471c92003-07-03 13:55:19 +10001189 if (s5_req.version != 0x05 ||
1190 s5_req.command != SSH_SOCKS5_CONNECT ||
1191 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001192 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001193 return -1;
1194 }
Darren Tucker47eede72005-03-14 23:08:12 +11001195 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001196 case SSH_SOCKS5_IPV4:
1197 addrlen = 4;
1198 af = AF_INET;
1199 break;
1200 case SSH_SOCKS5_DOMAIN:
1201 addrlen = p[sizeof(s5_req)];
1202 af = -1;
1203 break;
1204 case SSH_SOCKS5_IPV6:
1205 addrlen = 16;
1206 af = AF_INET6;
1207 break;
1208 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001209 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001210 return -1;
1211 }
Damien Miller0f077072006-07-10 22:21:02 +10001212 need = sizeof(s5_req) + addrlen + 2;
1213 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1214 need++;
1215 if (have < need)
Darren Tucker46471c92003-07-03 13:55:19 +10001216 return 0;
1217 buffer_consume(&c->input, sizeof(s5_req));
1218 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1219 buffer_consume(&c->input, 1); /* host string length */
Damien Millerce986542013-07-18 16:12:44 +10001220 buffer_get(&c->input, &dest_addr, addrlen);
Darren Tucker46471c92003-07-03 13:55:19 +10001221 buffer_get(&c->input, (char *)&dest_port, 2);
1222 dest_addr[addrlen] = '\0';
Darren Tuckera627d422013-06-02 07:31:17 +10001223 free(c->path);
1224 c->path = NULL;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001225 if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
Damien Miller9576ac42009-01-28 16:30:33 +11001226 if (addrlen >= NI_MAXHOST) {
Damien Millera1c1b6c2009-01-28 16:29:49 +11001227 error("channel %d: dynamic request: socks5 hostname "
1228 "\"%.100s\" too long", c->self, dest_addr);
1229 return -1;
1230 }
1231 c->path = xstrdup(dest_addr);
1232 } else {
1233 if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL)
1234 return -1;
1235 c->path = xstrdup(ntop);
1236 }
Darren Tucker46471c92003-07-03 13:55:19 +10001237 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001238
Damien Millerfbdeece2003-09-02 22:52:31 +10001239 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001240 c->self, c->path, c->host_port, s5_req.command);
1241
1242 s5_rsp.version = 0x05;
1243 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1244 s5_rsp.reserved = 0; /* ignored */
1245 s5_rsp.atyp = SSH_SOCKS5_IPV4;
Darren Tucker46471c92003-07-03 13:55:19 +10001246 dest_port = 0; /* ignored */
1247
Damien Millera0fdce92006-03-26 14:28:50 +11001248 buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp));
Damien Miller13840e02013-09-14 09:49:43 +10001249 buffer_put_int(&c->output, ntohl(INADDR_ANY)); /* bind address */
Damien Millera0fdce92006-03-26 14:28:50 +11001250 buffer_append(&c->output, &dest_port, sizeof(dest_port));
Darren Tucker46471c92003-07-03 13:55:19 +10001251 return 1;
1252}
1253
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001254Channel *
Damien Millere1537f92010-01-26 13:26:22 +11001255channel_connect_stdio_fwd(const char *host_to_connect, u_short port_to_connect,
1256 int in, int out)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001257{
1258 Channel *c;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001259
1260 debug("channel_connect_stdio_fwd %s:%d", host_to_connect,
1261 port_to_connect);
1262
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001263 c = channel_new("stdio-forward", SSH_CHANNEL_OPENING, in, out,
1264 -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1265 0, "stdio-forward", /*nonblock*/0);
1266
1267 c->path = xstrdup(host_to_connect);
1268 c->host_port = port_to_connect;
1269 c->listening_port = 0;
1270 c->force_drain = 1;
1271
1272 channel_register_fds(c, in, out, -1, 0, 1, 0);
1273 port_open_helper(c, "direct-tcpip");
1274
1275 return c;
1276}
1277
Ben Lindstromb3921512001-04-11 15:57:50 +00001278/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001279static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001280channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstromb3921512001-04-11 15:57:50 +00001281{
1282 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001283 u_int have;
1284 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001285
1286 have = buffer_len(&c->input);
Ben Lindstromb3921512001-04-11 15:57:50 +00001287 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001288 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001289 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001290 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001291 /* need more */
1292 FD_SET(c->sock, readset);
1293 return;
1294 }
1295 /* try to guess the protocol */
1296 p = buffer_ptr(&c->input);
1297 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001298 case 0x04:
1299 ret = channel_decode_socks4(c, readset, writeset);
1300 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001301 case 0x05:
1302 ret = channel_decode_socks5(c, readset, writeset);
1303 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001304 default:
1305 ret = -1;
1306 break;
1307 }
1308 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001309 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001310 } else if (ret == 0) {
1311 debug2("channel %d: pre_dynamic: need more", c->self);
1312 /* need more */
1313 FD_SET(c->sock, readset);
1314 } else {
1315 /* switch to the next state */
1316 c->type = SSH_CHANNEL_OPENING;
1317 port_open_helper(c, "direct-tcpip");
1318 }
1319}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001320
Damien Millerb38eff82000-04-01 11:09:21 +10001321/* This is our fake X11 server socket. */
Damien Miller8473dd82006-07-24 14:08:32 +10001322/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001323static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001324channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001325{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001326 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001327 struct sockaddr_storage addr;
Damien Miller37f1c082013-04-23 15:20:43 +10001328 int newsock, oerrno;
Damien Millerb38eff82000-04-01 11:09:21 +10001329 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001330 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001331 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001332
1333 if (FD_ISSET(c->sock, readset)) {
1334 debug("X11 connection requested.");
1335 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001336 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001337 if (c->single_connection) {
Damien Miller37f1c082013-04-23 15:20:43 +10001338 oerrno = errno;
Damien Millerfbdeece2003-09-02 22:52:31 +10001339 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001340 channel_close_fd(&c->sock);
1341 chan_mark_dead(c);
Damien Miller37f1c082013-04-23 15:20:43 +10001342 errno = oerrno;
Damien Millere7378562001-12-21 14:58:35 +11001343 }
Damien Millerb38eff82000-04-01 11:09:21 +10001344 if (newsock < 0) {
Damien Miller37f1c082013-04-23 15:20:43 +10001345 if (errno != EINTR && errno != EWOULDBLOCK &&
1346 errno != ECONNABORTED)
1347 error("accept: %.100s", strerror(errno));
Damien Millera6508752012-04-22 11:21:10 +10001348 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001349 c->notbefore = monotime() + 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001350 return;
1351 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001352 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001353 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001354 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001355 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001356 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001357
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001358 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001359 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001360 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001361 if (compat20) {
1362 packet_start(SSH2_MSG_CHANNEL_OPEN);
1363 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001364 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001365 packet_put_int(nc->local_window_max);
1366 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001367 /* originator ipaddr and port */
1368 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001369 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001370 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001371 } else {
1372 packet_put_int(remote_port);
1373 }
Damien Millerbd483e72000-04-30 10:00:53 +10001374 packet_send();
1375 } else {
1376 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001377 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001378 if (packet_get_protocol_flags() &
1379 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001380 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001381 packet_send();
1382 }
Darren Tuckera627d422013-06-02 07:31:17 +10001383 free(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001384 }
1385}
1386
Ben Lindstrombba81212001-06-25 05:01:22 +00001387static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001388port_open_helper(Channel *c, char *rtype)
1389{
1390 int direct;
1391 char buf[1024];
Damien Miller4def1842013-12-29 17:45:26 +11001392 char *local_ipaddr = get_local_ipaddr(c->sock);
Damien Miller0890dc82014-02-24 15:56:07 +11001393 int local_port = c->sock == -1 ? 65536 : get_sock_port(c->sock, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001394 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001395 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001396
Damien Millerd6369432010-02-02 17:02:07 +11001397 if (remote_port == -1) {
1398 /* Fake addr/port to appease peers that validate it (Tectia) */
Darren Tuckera627d422013-06-02 07:31:17 +10001399 free(remote_ipaddr);
Damien Millerd6369432010-02-02 17:02:07 +11001400 remote_ipaddr = xstrdup("127.0.0.1");
1401 remote_port = 65535;
1402 }
1403
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001404 direct = (strcmp(rtype, "direct-tcpip") == 0);
1405
1406 snprintf(buf, sizeof buf,
1407 "%s: listening port %d for %.100s port %d, "
Damien Miller4def1842013-12-29 17:45:26 +11001408 "connect from %.200s port %d to %.100s port %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001409 rtype, c->listening_port, c->path, c->host_port,
Damien Miller4def1842013-12-29 17:45:26 +11001410 remote_ipaddr, remote_port, local_ipaddr, local_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001411
Darren Tuckera627d422013-06-02 07:31:17 +10001412 free(c->remote_name);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001413 c->remote_name = xstrdup(buf);
1414
1415 if (compat20) {
1416 packet_start(SSH2_MSG_CHANNEL_OPEN);
1417 packet_put_cstring(rtype);
1418 packet_put_int(c->self);
1419 packet_put_int(c->local_window_max);
1420 packet_put_int(c->local_maxpacket);
1421 if (direct) {
1422 /* target host, port */
1423 packet_put_cstring(c->path);
1424 packet_put_int(c->host_port);
1425 } else {
1426 /* listen address, port */
1427 packet_put_cstring(c->path);
Damien Miller4def1842013-12-29 17:45:26 +11001428 packet_put_int(local_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001429 }
1430 /* originator host and port */
1431 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001432 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001433 packet_send();
1434 } else {
1435 packet_start(SSH_MSG_PORT_OPEN);
1436 packet_put_int(c->self);
1437 packet_put_cstring(c->path);
1438 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001439 if (packet_get_protocol_flags() &
1440 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001441 packet_put_cstring(c->remote_name);
1442 packet_send();
1443 }
Darren Tuckera627d422013-06-02 07:31:17 +10001444 free(remote_ipaddr);
Damien Miller4def1842013-12-29 17:45:26 +11001445 free(local_ipaddr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001446}
1447
Damien Miller5e7fd072005-11-05 14:53:39 +11001448static void
1449channel_set_reuseaddr(int fd)
1450{
1451 int on = 1;
1452
1453 /*
1454 * Set socket options.
1455 * Allow local port reuse in TIME_WAIT.
1456 */
1457 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1458 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1459}
1460
Damien Millerb38eff82000-04-01 11:09:21 +10001461/*
1462 * This socket is listening for connections to a forwarded TCP/IP port.
1463 */
Damien Miller8473dd82006-07-24 14:08:32 +10001464/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001465static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001466channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001467{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001468 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001469 struct sockaddr_storage addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001470 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001471 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001472 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001473
Damien Millerb38eff82000-04-01 11:09:21 +10001474 if (FD_ISSET(c->sock, readset)) {
1475 debug("Connection to port %d forwarding "
1476 "to %.100s port %d requested.",
1477 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001478
Damien Miller4623a752001-10-10 15:03:58 +10001479 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1480 nextstate = SSH_CHANNEL_OPENING;
1481 rtype = "forwarded-tcpip";
1482 } else {
1483 if (c->host_port == 0) {
1484 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001485 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001486 } else {
1487 nextstate = SSH_CHANNEL_OPENING;
1488 rtype = "direct-tcpip";
1489 }
1490 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001491
Damien Millerb38eff82000-04-01 11:09:21 +10001492 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001493 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001494 if (newsock < 0) {
Damien Miller37f1c082013-04-23 15:20:43 +10001495 if (errno != EINTR && errno != EWOULDBLOCK &&
1496 errno != ECONNABORTED)
1497 error("accept: %.100s", strerror(errno));
Damien Millera6508752012-04-22 11:21:10 +10001498 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001499 c->notbefore = monotime() + 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001500 return;
1501 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001502 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001503 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1504 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001505 nc->listening_port = c->listening_port;
1506 nc->host_port = c->host_port;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001507 if (c->path != NULL)
1508 nc->path = xstrdup(c->path);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001509
Darren Tucker876045b2010-01-08 17:08:00 +11001510 if (nextstate != SSH_CHANNEL_DYNAMIC)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001511 port_open_helper(nc, rtype);
Damien Millerb38eff82000-04-01 11:09:21 +10001512 }
1513}
1514
1515/*
1516 * This is the authentication agent socket listening for connections from
1517 * clients.
1518 */
Damien Miller8473dd82006-07-24 14:08:32 +10001519/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001520static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001521channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001522{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001523 Channel *nc;
1524 int newsock;
Damien Miller163886f2008-07-14 11:28:58 +10001525 struct sockaddr_storage addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001526 socklen_t addrlen;
1527
1528 if (FD_ISSET(c->sock, readset)) {
1529 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001530 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001531 if (newsock < 0) {
Damien Millera6508752012-04-22 11:21:10 +10001532 error("accept from auth socket: %.100s",
1533 strerror(errno));
1534 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001535 c->notbefore = monotime() + 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001536 return;
1537 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001538 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001539 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1540 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001541 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001542 if (compat20) {
1543 packet_start(SSH2_MSG_CHANNEL_OPEN);
1544 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001545 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001546 packet_put_int(c->local_window_max);
1547 packet_put_int(c->local_maxpacket);
1548 } else {
1549 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001550 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001551 }
Damien Millerb38eff82000-04-01 11:09:21 +10001552 packet_send();
1553 }
1554}
1555
Damien Miller8473dd82006-07-24 14:08:32 +10001556/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001557static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001558channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001559{
Damien Millerbd740252008-05-19 15:37:09 +10001560 int err = 0, sock;
Ben Lindstrom11180952001-07-04 05:13:35 +00001561 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001562
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001563 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001564 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001565 err = errno;
1566 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001567 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001568 if (err == 0) {
Damien Millerbd740252008-05-19 15:37:09 +10001569 debug("channel %d: connected to %s port %d",
1570 c->self, c->connect_ctx.host, c->connect_ctx.port);
1571 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001572 c->type = SSH_CHANNEL_OPEN;
1573 if (compat20) {
1574 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1575 packet_put_int(c->remote_id);
1576 packet_put_int(c->self);
1577 packet_put_int(c->local_window);
1578 packet_put_int(c->local_maxpacket);
1579 } else {
1580 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1581 packet_put_int(c->remote_id);
1582 packet_put_int(c->self);
1583 }
1584 } else {
Damien Millerbd740252008-05-19 15:37:09 +10001585 debug("channel %d: connection failed: %s",
Ben Lindstrom69128662001-05-08 20:07:39 +00001586 c->self, strerror(err));
Damien Millerbd740252008-05-19 15:37:09 +10001587 /* Try next address, if any */
1588 if ((sock = connect_next(&c->connect_ctx)) > 0) {
1589 close(c->sock);
1590 c->sock = c->rfd = c->wfd = sock;
1591 channel_max_fd = channel_find_maxfd();
1592 return;
1593 }
1594 /* Exhausted all addresses */
1595 error("connect_to %.100s port %d: failed.",
1596 c->connect_ctx.host, c->connect_ctx.port);
1597 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001598 if (compat20) {
1599 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1600 packet_put_int(c->remote_id);
1601 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1602 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1603 packet_put_cstring(strerror(err));
1604 packet_put_cstring("");
1605 }
1606 } else {
1607 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1608 packet_put_int(c->remote_id);
1609 }
1610 chan_mark_dead(c);
1611 }
1612 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001613 }
1614}
1615
Damien Miller8473dd82006-07-24 14:08:32 +10001616/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001617static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001618channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001619{
Darren Tucker11327cc2005-03-14 23:22:25 +11001620 char buf[CHAN_RBUF];
Damien Miller835284b2007-06-11 13:03:16 +10001621 int len, force;
Damien Millerb38eff82000-04-01 11:09:21 +10001622
Damien Miller835284b2007-06-11 13:03:16 +10001623 force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED;
1624 if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001625 errno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001626 len = read(c->rfd, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +10001627 if (len < 0 && (errno == EINTR ||
1628 ((errno == EAGAIN || errno == EWOULDBLOCK) && !force)))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001629 return 1;
Darren Tucker9afe1152006-06-23 21:24:12 +10001630#ifndef PTY_ZEROREAD
Damien Millerb38eff82000-04-01 11:09:21 +10001631 if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001632#else
Darren Tucker144e8d62006-06-25 08:25:25 +10001633 if ((!c->isatty && len <= 0) ||
1634 (c->isatty && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001635#endif
Damien Millerfbdeece2003-09-02 22:52:31 +10001636 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001637 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001638 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001639 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001640 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001641 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001642 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001643 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001644 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001645 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001646 } else {
1647 chan_read_failed(c);
1648 }
1649 return -1;
1650 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001651 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001652 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001653 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001654 chan_read_failed(c);
1655 }
Damien Millerd27b9472005-12-13 19:29:02 +11001656 } else if (c->datagram) {
1657 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001658 } else {
1659 buffer_append(&c->input, buf, len);
1660 }
Damien Millerb38eff82000-04-01 11:09:21 +10001661 }
1662 return 1;
1663}
Damien Miller4f7becb2006-03-26 14:10:14 +11001664
Damien Miller8473dd82006-07-24 14:08:32 +10001665/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001666static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001667channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001668{
Ben Lindstrome229b252001-03-05 06:28:06 +00001669 struct termios tio;
Damien Miller077b2382005-12-31 16:22:32 +11001670 u_char *data = NULL, *buf;
Damien Miller7d457182010-08-05 23:09:48 +10001671 u_int dlen, olen = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001672 int len;
1673
1674 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001675 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001676 FD_ISSET(c->wfd, writeset) &&
1677 buffer_len(&c->output) > 0) {
Damien Miller7d457182010-08-05 23:09:48 +10001678 olen = buffer_len(&c->output);
Damien Miller077b2382005-12-31 16:22:32 +11001679 if (c->output_filter != NULL) {
1680 if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1681 debug2("channel %d: filter stops", c->self);
Damien Millere204f6a2006-01-31 21:47:15 +11001682 if (c->type != SSH_CHANNEL_OPEN)
1683 chan_mark_dead(c);
1684 else
1685 chan_write_failed(c);
1686 return -1;
Damien Miller077b2382005-12-31 16:22:32 +11001687 }
1688 } else if (c->datagram) {
1689 buf = data = buffer_get_string(&c->output, &dlen);
1690 } else {
1691 buf = data = buffer_ptr(&c->output);
1692 dlen = buffer_len(&c->output);
1693 }
1694
Damien Millerd27b9472005-12-13 19:29:02 +11001695 if (c->datagram) {
Damien Millerd27b9472005-12-13 19:29:02 +11001696 /* ignore truncated writes, datagrams might get lost */
Damien Miller077b2382005-12-31 16:22:32 +11001697 len = write(c->wfd, buf, dlen);
Darren Tuckera627d422013-06-02 07:31:17 +10001698 free(data);
Damien Millerd8968ad2008-07-04 23:10:49 +10001699 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1700 errno == EWOULDBLOCK))
Damien Millerd27b9472005-12-13 19:29:02 +11001701 return 1;
1702 if (len <= 0) {
1703 if (c->type != SSH_CHANNEL_OPEN)
1704 chan_mark_dead(c);
1705 else
1706 chan_write_failed(c);
1707 return -1;
1708 }
Damien Miller7d457182010-08-05 23:09:48 +10001709 goto out;
Damien Millerd27b9472005-12-13 19:29:02 +11001710 }
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001711#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001712 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001713 if (compat20 && c->wfd_isatty)
1714 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001715#endif
Damien Miller077b2382005-12-31 16:22:32 +11001716
1717 len = write(c->wfd, buf, dlen);
Damien Millerd8968ad2008-07-04 23:10:49 +10001718 if (len < 0 &&
1719 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001720 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001721 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001722 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001723 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001724 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001725 return -1;
1726 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001727 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001728 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001729 c->type = SSH_CHANNEL_INPUT_DRAINING;
1730 } else {
1731 chan_write_failed(c);
1732 }
1733 return -1;
1734 }
Darren Tucker3980b632009-08-28 11:02:37 +10001735#ifndef BROKEN_TCGETATTR_ICANON
Damien Miller077b2382005-12-31 16:22:32 +11001736 if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001737 if (tcgetattr(c->wfd, &tio) == 0 &&
1738 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1739 /*
1740 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001741 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001742 * size of a SSH2_MSG_CHANNEL_DATA message
Damien Miller077b2382005-12-31 16:22:32 +11001743 * (4 byte channel id + buf)
Damien Miller79438cc2001-02-16 12:34:57 +11001744 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001745 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001746 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001747 }
1748 }
Darren Tucker3980b632009-08-28 11:02:37 +10001749#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001750 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001751 }
Damien Miller7d457182010-08-05 23:09:48 +10001752 out:
1753 if (compat20 && olen > 0)
1754 c->local_consumed += olen - buffer_len(&c->output);
Damien Miller33b13562000-04-04 14:38:59 +10001755 return 1;
1756}
Damien Miller4f7becb2006-03-26 14:10:14 +11001757
Ben Lindstrombba81212001-06-25 05:01:22 +00001758static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001759channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller33b13562000-04-04 14:38:59 +10001760{
Darren Tucker11327cc2005-03-14 23:22:25 +11001761 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001762 int len;
1763
Damien Miller1383bd82000-04-06 12:32:37 +10001764/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001765 if (c->efd != -1) {
1766 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1767 FD_ISSET(c->efd, writeset) &&
1768 buffer_len(&c->extended) > 0) {
1769 len = write(c->efd, buffer_ptr(&c->extended),
1770 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001771 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001772 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001773 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1774 errno == EWOULDBLOCK))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001775 return 1;
1776 if (len <= 0) {
1777 debug2("channel %d: closing write-efd %d",
1778 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001779 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001780 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001781 buffer_consume(&c->extended, len);
1782 c->local_consumed += len;
1783 }
Damien Miller8853ca52010-06-26 10:00:14 +10001784 } else if (c->efd != -1 &&
1785 (c->extended_usage == CHAN_EXTENDED_READ ||
1786 c->extended_usage == CHAN_EXTENDED_IGNORE) &&
Damien Millere42bd242007-01-29 10:16:28 +11001787 (c->detach_close || FD_ISSET(c->efd, readset))) {
Damien Miller33b13562000-04-04 14:38:59 +10001788 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001789 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001790 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001791 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
1792 errno == EWOULDBLOCK) && !c->detach_close)))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001793 return 1;
1794 if (len <= 0) {
1795 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001796 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001797 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001798 } else {
Damien Miller8853ca52010-06-26 10:00:14 +10001799 if (c->extended_usage == CHAN_EXTENDED_IGNORE) {
1800 debug3("channel %d: discard efd",
1801 c->self);
1802 } else
1803 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001804 }
Damien Miller33b13562000-04-04 14:38:59 +10001805 }
1806 }
1807 return 1;
1808}
Damien Miller4f7becb2006-03-26 14:10:14 +11001809
Damien Miller0e220db2004-06-15 10:34:08 +10001810static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001811channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001812{
Ben Lindstromb3921512001-04-11 15:57:50 +00001813 if (c->type == SSH_CHANNEL_OPEN &&
1814 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Darren Tuckerae09cb82007-06-25 19:04:46 +10001815 ((c->local_window_max - c->local_window >
Damien Miller3191a8e2007-06-11 18:33:15 +10001816 c->local_maxpacket*3) ||
1817 c->local_window < c->local_window_max/2) &&
Damien Miller33b13562000-04-04 14:38:59 +10001818 c->local_consumed > 0) {
1819 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1820 packet_put_int(c->remote_id);
1821 packet_put_int(c->local_consumed);
1822 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001823 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001824 c->self, c->local_window,
1825 c->local_consumed);
1826 c->local_window += c->local_consumed;
1827 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001828 }
1829 return 1;
1830}
1831
Ben Lindstrombba81212001-06-25 05:01:22 +00001832static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001833channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001834{
1835 channel_handle_rfd(c, readset, writeset);
1836 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001837 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001838 return;
Damien Miller33b13562000-04-04 14:38:59 +10001839 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001840 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001841}
1842
Damien Millere1537f92010-01-26 13:26:22 +11001843static u_int
1844read_mux(Channel *c, u_int need)
1845{
1846 char buf[CHAN_RBUF];
1847 int len;
1848 u_int rlen;
1849
1850 if (buffer_len(&c->input) < need) {
1851 rlen = need - buffer_len(&c->input);
1852 len = read(c->rfd, buf, MIN(rlen, CHAN_RBUF));
1853 if (len <= 0) {
1854 if (errno != EINTR && errno != EAGAIN) {
1855 debug2("channel %d: ctl read<=0 rfd %d len %d",
1856 c->self, c->rfd, len);
1857 chan_read_failed(c);
1858 return 0;
1859 }
1860 } else
1861 buffer_append(&c->input, buf, len);
1862 }
1863 return buffer_len(&c->input);
1864}
1865
1866static void
1867channel_post_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
1868{
1869 u_int need;
1870 ssize_t len;
1871
1872 if (!compat20)
1873 fatal("%s: entered with !compat20", __func__);
1874
Damien Millerd530f5f2010-05-21 14:57:10 +10001875 if (c->rfd != -1 && !c->mux_pause && FD_ISSET(c->rfd, readset) &&
Damien Millere1537f92010-01-26 13:26:22 +11001876 (c->istate == CHAN_INPUT_OPEN ||
1877 c->istate == CHAN_INPUT_WAIT_DRAIN)) {
1878 /*
1879 * Don't not read past the precise end of packets to
1880 * avoid disrupting fd passing.
1881 */
1882 if (read_mux(c, 4) < 4) /* read header */
1883 return;
1884 need = get_u32(buffer_ptr(&c->input));
1885#define CHANNEL_MUX_MAX_PACKET (256 * 1024)
1886 if (need > CHANNEL_MUX_MAX_PACKET) {
1887 debug2("channel %d: packet too big %u > %u",
1888 c->self, CHANNEL_MUX_MAX_PACKET, need);
1889 chan_rcvd_oclose(c);
1890 return;
1891 }
1892 if (read_mux(c, need + 4) < need + 4) /* read body */
1893 return;
1894 if (c->mux_rcb(c) != 0) {
1895 debug("channel %d: mux_rcb failed", c->self);
1896 chan_mark_dead(c);
1897 return;
1898 }
1899 }
1900
1901 if (c->wfd != -1 && FD_ISSET(c->wfd, writeset) &&
1902 buffer_len(&c->output) > 0) {
1903 len = write(c->wfd, buffer_ptr(&c->output),
1904 buffer_len(&c->output));
1905 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1906 return;
1907 if (len <= 0) {
1908 chan_mark_dead(c);
1909 return;
1910 }
1911 buffer_consume(&c->output, len);
1912 }
1913}
1914
1915static void
1916channel_post_mux_listener(Channel *c, fd_set *readset, fd_set *writeset)
1917{
1918 Channel *nc;
1919 struct sockaddr_storage addr;
1920 socklen_t addrlen;
1921 int newsock;
1922 uid_t euid;
1923 gid_t egid;
1924
1925 if (!FD_ISSET(c->sock, readset))
1926 return;
1927
1928 debug("multiplexing control connection");
1929
1930 /*
1931 * Accept connection on control socket
1932 */
1933 memset(&addr, 0, sizeof(addr));
1934 addrlen = sizeof(addr);
1935 if ((newsock = accept(c->sock, (struct sockaddr*)&addr,
1936 &addrlen)) == -1) {
1937 error("%s accept: %s", __func__, strerror(errno));
Damien Millera6508752012-04-22 11:21:10 +10001938 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001939 c->notbefore = monotime() + 1;
Damien Millere1537f92010-01-26 13:26:22 +11001940 return;
1941 }
1942
1943 if (getpeereid(newsock, &euid, &egid) < 0) {
1944 error("%s getpeereid failed: %s", __func__,
1945 strerror(errno));
1946 close(newsock);
1947 return;
1948 }
1949 if ((euid != 0) && (getuid() != euid)) {
1950 error("multiplex uid mismatch: peer euid %u != uid %u",
1951 (u_int)euid, (u_int)getuid());
1952 close(newsock);
1953 return;
1954 }
1955 nc = channel_new("multiplex client", SSH_CHANNEL_MUX_CLIENT,
1956 newsock, newsock, -1, c->local_window_max,
1957 c->local_maxpacket, 0, "mux-control", 1);
1958 nc->mux_rcb = c->mux_rcb;
1959 debug3("%s: new mux channel %d fd %d", __func__,
1960 nc->self, nc->sock);
1961 /* establish state */
1962 nc->mux_rcb(nc);
1963 /* mux state transitions must not elicit protocol messages */
1964 nc->flags |= CHAN_LOCAL;
1965}
1966
Damien Miller8473dd82006-07-24 14:08:32 +10001967/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001968static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001969channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001970{
1971 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001972
Damien Millerb38eff82000-04-01 11:09:21 +10001973 /* Send buffered output data to the socket. */
1974 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1975 len = write(c->sock, buffer_ptr(&c->output),
1976 buffer_len(&c->output));
1977 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001978 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001979 else
1980 buffer_consume(&c->output, len);
1981 }
1982}
1983
Ben Lindstrombba81212001-06-25 05:01:22 +00001984static void
Damien Miller33b13562000-04-04 14:38:59 +10001985channel_handler_init_20(void)
1986{
Damien Millerde6987c2002-01-22 23:20:40 +11001987 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001988 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001989 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001990 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001991 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001992 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001993 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001994 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millere1537f92010-01-26 13:26:22 +11001995 channel_pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener;
1996 channel_pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10001997
Damien Millerde6987c2002-01-22 23:20:40 +11001998 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001999 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002000 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10002001 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002002 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002003 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002004 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millere1537f92010-01-26 13:26:22 +11002005 channel_post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener;
2006 channel_post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10002007}
2008
Ben Lindstrombba81212001-06-25 05:01:22 +00002009static void
Damien Millerb38eff82000-04-01 11:09:21 +10002010channel_handler_init_13(void)
2011{
2012 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
2013 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
2014 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2015 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2016 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
2017 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
2018 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002019 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002020 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10002021
Damien Millerde6987c2002-01-22 23:20:40 +11002022 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002023 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2024 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2025 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
2026 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002027 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002028 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002029}
2030
Ben Lindstrombba81212001-06-25 05:01:22 +00002031static void
Damien Millerb38eff82000-04-01 11:09:21 +10002032channel_handler_init_15(void)
2033{
Damien Millerde6987c2002-01-22 23:20:40 +11002034 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10002035 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002036 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2037 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2038 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002039 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002040 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10002041
2042 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2043 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2044 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11002045 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002046 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002047 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002048}
2049
Ben Lindstrombba81212001-06-25 05:01:22 +00002050static void
Damien Millerb38eff82000-04-01 11:09:21 +10002051channel_handler_init(void)
2052{
2053 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002054
Damien Miller9f0f5c62001-12-21 14:45:46 +11002055 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10002056 channel_pre[i] = NULL;
2057 channel_post[i] = NULL;
2058 }
Damien Miller33b13562000-04-04 14:38:59 +10002059 if (compat20)
2060 channel_handler_init_20();
2061 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002062 channel_handler_init_13();
2063 else
2064 channel_handler_init_15();
2065}
2066
Damien Miller3ec27592001-10-12 11:35:04 +10002067/* gc dead channels */
2068static void
2069channel_garbage_collect(Channel *c)
2070{
2071 if (c == NULL)
2072 return;
2073 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11002074 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10002075 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002076 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002077 c->detach_user(c->self, NULL);
2078 /* if we still have a callback */
2079 if (c->detach_user != NULL)
2080 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002081 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002082 }
2083 if (!chan_is_dead(c, 1))
2084 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002085 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002086 channel_free(c);
2087}
2088
Ben Lindstrombba81212001-06-25 05:01:22 +00002089static void
Damien Millera6508752012-04-22 11:21:10 +10002090channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset,
2091 time_t *unpause_secs)
Damien Millerb38eff82000-04-01 11:09:21 +10002092{
2093 static int did_init = 0;
Darren Tucker876045b2010-01-08 17:08:00 +11002094 u_int i, oalloc;
Damien Millerb38eff82000-04-01 11:09:21 +10002095 Channel *c;
Damien Millera6508752012-04-22 11:21:10 +10002096 time_t now;
Damien Millerb38eff82000-04-01 11:09:21 +10002097
2098 if (!did_init) {
2099 channel_handler_init();
2100 did_init = 1;
2101 }
Darren Tuckerb759c9c2013-06-02 07:46:16 +10002102 now = monotime();
Damien Millera6508752012-04-22 11:21:10 +10002103 if (unpause_secs != NULL)
2104 *unpause_secs = 0;
Darren Tucker876045b2010-01-08 17:08:00 +11002105 for (i = 0, oalloc = channels_alloc; i < oalloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002106 c = channels[i];
2107 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10002108 continue;
Darren Tucker876045b2010-01-08 17:08:00 +11002109 if (c->delayed) {
2110 if (ftab == channel_pre)
2111 c->delayed = 0;
2112 else
2113 continue;
2114 }
Damien Millera6508752012-04-22 11:21:10 +10002115 if (ftab[c->type] != NULL) {
2116 /*
2117 * Run handlers that are not paused.
2118 */
2119 if (c->notbefore <= now)
2120 (*ftab[c->type])(c, readset, writeset);
2121 else if (unpause_secs != NULL) {
2122 /*
2123 * Collect the time that the earliest
2124 * channel comes off pause.
2125 */
2126 debug3("%s: chan %d: skip for %d more seconds",
2127 __func__, c->self,
2128 (int)(c->notbefore - now));
2129 if (*unpause_secs == 0 ||
2130 (c->notbefore - now) < *unpause_secs)
2131 *unpause_secs = c->notbefore - now;
2132 }
2133 }
Damien Miller3ec27592001-10-12 11:35:04 +10002134 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002135 }
Damien Millera6508752012-04-22 11:21:10 +10002136 if (unpause_secs != NULL && *unpause_secs != 0)
2137 debug3("%s: first channel unpauses in %d seconds",
2138 __func__, (int)*unpause_secs);
Damien Millerb38eff82000-04-01 11:09:21 +10002139}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002140
Ben Lindstrome9c99912001-06-09 00:41:05 +00002141/*
2142 * Allocate/update select bitmasks and add any bits relevant to channels in
2143 * select bitmasks.
2144 */
Damien Miller4af51302000-04-16 11:18:38 +10002145void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002146channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Damien Millerba77e1f2012-04-23 18:21:05 +10002147 u_int *nallocp, time_t *minwait_secs, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002148{
Damien Miller36812092006-03-26 14:22:47 +11002149 u_int n, sz, nfdset;
Damien Miller5e953212001-01-30 09:14:00 +11002150
2151 n = MAX(*maxfdp, channel_max_fd);
2152
Damien Miller36812092006-03-26 14:22:47 +11002153 nfdset = howmany(n+1, NFDBITS);
2154 /* Explicitly test here, because xrealloc isn't always called */
2155 if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask))
2156 fatal("channel_prepare_select: max_fd (%d) is too large", n);
2157 sz = nfdset * sizeof(fd_mask);
2158
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002159 /* perhaps check sz < nalloc/2 and shrink? */
2160 if (*readsetp == NULL || sz > *nallocp) {
Damien Miller36812092006-03-26 14:22:47 +11002161 *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask));
2162 *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask));
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002163 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11002164 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002165 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11002166 memset(*readsetp, 0, sz);
2167 memset(*writesetp, 0, sz);
2168
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002169 if (!rekeying)
Damien Millera6508752012-04-22 11:21:10 +10002170 channel_handler(channel_pre, *readsetp, *writesetp,
2171 minwait_secs);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002172}
2173
Ben Lindstrome9c99912001-06-09 00:41:05 +00002174/*
2175 * After select, perform any appropriate operations for channels which have
2176 * events pending.
2177 */
Damien Miller4af51302000-04-16 11:18:38 +10002178void
Damien Millerd62f2ca2006-03-26 13:57:41 +11002179channel_after_select(fd_set *readset, fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002180{
Damien Millera6508752012-04-22 11:21:10 +10002181 channel_handler(channel_post, readset, writeset, NULL);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002182}
2183
Ben Lindstrome9c99912001-06-09 00:41:05 +00002184
Damien Miller5e953212001-01-30 09:14:00 +11002185/* If there is data to send to the connection, enqueue some of it now. */
Damien Miller4af51302000-04-16 11:18:38 +10002186void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002187channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002188{
Damien Millerb38eff82000-04-01 11:09:21 +10002189 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002190 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002191
Damien Miller95def091999-11-25 00:26:21 +11002192 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002193 c = channels[i];
2194 if (c == NULL)
2195 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002196
Ben Lindstrome9c99912001-06-09 00:41:05 +00002197 /*
2198 * We are only interested in channels that can have buffered
2199 * incoming data.
2200 */
Damien Miller34132e52000-01-14 15:45:46 +11002201 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10002202 if (c->type != SSH_CHANNEL_OPEN &&
2203 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11002204 continue;
2205 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10002206 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002207 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002208 }
Damien Millerefb4afe2000-04-12 18:45:05 +10002209 if (compat20 &&
2210 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002211 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10002212 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002213 continue;
2214 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002215
Damien Miller95def091999-11-25 00:26:21 +11002216 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002217 if ((c->istate == CHAN_INPUT_OPEN ||
2218 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
2219 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11002220 if (c->datagram) {
2221 if (len > 0) {
2222 u_char *data;
2223 u_int dlen;
2224
2225 data = buffer_get_string(&c->input,
2226 &dlen);
Damien Miller7d457182010-08-05 23:09:48 +10002227 if (dlen > c->remote_window ||
2228 dlen > c->remote_maxpacket) {
2229 debug("channel %d: datagram "
2230 "too big for channel",
2231 c->self);
Darren Tuckera627d422013-06-02 07:31:17 +10002232 free(data);
Damien Miller7d457182010-08-05 23:09:48 +10002233 continue;
2234 }
Damien Millerd27b9472005-12-13 19:29:02 +11002235 packet_start(SSH2_MSG_CHANNEL_DATA);
2236 packet_put_int(c->remote_id);
2237 packet_put_string(data, dlen);
2238 packet_send();
2239 c->remote_window -= dlen + 4;
Darren Tuckera627d422013-06-02 07:31:17 +10002240 free(data);
Damien Millerd27b9472005-12-13 19:29:02 +11002241 }
2242 continue;
2243 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002244 /*
2245 * Send some data for the other side over the secure
2246 * connection.
2247 */
Damien Miller33b13562000-04-04 14:38:59 +10002248 if (compat20) {
2249 if (len > c->remote_window)
2250 len = c->remote_window;
2251 if (len > c->remote_maxpacket)
2252 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11002253 } else {
Damien Miller33b13562000-04-04 14:38:59 +10002254 if (packet_is_interactive()) {
2255 if (len > 1024)
2256 len = 512;
2257 } else {
2258 /* Keep the packets at reasonable size. */
2259 if (len > packet_get_maxsize()/2)
2260 len = packet_get_maxsize()/2;
2261 }
Damien Miller95def091999-11-25 00:26:21 +11002262 }
Damien Millerb38eff82000-04-01 11:09:21 +10002263 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10002264 packet_start(compat20 ?
2265 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10002266 packet_put_int(c->remote_id);
2267 packet_put_string(buffer_ptr(&c->input), len);
2268 packet_send();
2269 buffer_consume(&c->input, len);
2270 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10002271 }
2272 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11002273 if (compat13)
2274 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11002275 /*
2276 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00002277 * tell peer, that we will not send more data: send IEOF.
2278 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11002279 */
Ben Lindstromcf159442002-03-26 03:26:24 +00002280 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10002281 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
2282 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00002283 else
2284 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11002285 }
Damien Miller33b13562000-04-04 14:38:59 +10002286 /* Send extended data, i.e. stderr */
2287 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00002288 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10002289 c->remote_window > 0 &&
2290 (len = buffer_len(&c->extended)) > 0 &&
2291 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002292 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002293 c->self, c->remote_window, buffer_len(&c->extended),
2294 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10002295 if (len > c->remote_window)
2296 len = c->remote_window;
2297 if (len > c->remote_maxpacket)
2298 len = c->remote_maxpacket;
2299 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
2300 packet_put_int(c->remote_id);
2301 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
2302 packet_put_string(buffer_ptr(&c->extended), len);
2303 packet_send();
2304 buffer_consume(&c->extended, len);
2305 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002306 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10002307 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002308 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002309}
2310
Ben Lindstrome9c99912001-06-09 00:41:05 +00002311
2312/* -- protocol input */
Damien Millerd79b4242006-03-31 23:11:44 +11002313
2314/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002315void
Damien Miller630d6f42002-01-22 23:17:30 +11002316channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002317{
Damien Miller34132e52000-01-14 15:45:46 +11002318 int id;
Damien Miller633de332014-05-15 13:48:26 +10002319 const u_char *data;
Damien Miller7d457182010-08-05 23:09:48 +10002320 u_int data_len, win_len;
Damien Millerb38eff82000-04-01 11:09:21 +10002321 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002322
Damien Miller95def091999-11-25 00:26:21 +11002323 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11002324 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10002325 c = channel_lookup(id);
2326 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11002327 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002328
Damien Miller95def091999-11-25 00:26:21 +11002329 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10002330 if (c->type != SSH_CHANNEL_OPEN &&
2331 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002332 return;
2333
Damien Miller95def091999-11-25 00:26:21 +11002334 /* Get the data. */
Damien Millerdb255ca2008-05-19 14:59:37 +10002335 data = packet_get_string_ptr(&data_len);
Damien Miller7d457182010-08-05 23:09:48 +10002336 win_len = data_len;
2337 if (c->datagram)
2338 win_len += 4; /* string length header */
Damien Millerb38eff82000-04-01 11:09:21 +10002339
Damien Millera04ad492004-01-21 11:02:09 +11002340 /*
2341 * Ignore data for protocol > 1.3 if output end is no longer open.
2342 * For protocol 2 the sending side is reducing its window as it sends
2343 * data, so we must 'fake' consumption of the data in order to ensure
2344 * that window updates are sent back. Otherwise the connection might
2345 * deadlock.
2346 */
2347 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
2348 if (compat20) {
Damien Miller7d457182010-08-05 23:09:48 +10002349 c->local_window -= win_len;
2350 c->local_consumed += win_len;
Damien Millera04ad492004-01-21 11:02:09 +11002351 }
Damien Millera04ad492004-01-21 11:02:09 +11002352 return;
2353 }
2354
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002355 if (compat20) {
Damien Miller7d457182010-08-05 23:09:48 +10002356 if (win_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10002357 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller7d457182010-08-05 23:09:48 +10002358 c->self, win_len, c->local_maxpacket);
Damien Miller33b13562000-04-04 14:38:59 +10002359 }
Damien Miller7d457182010-08-05 23:09:48 +10002360 if (win_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002361 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller7d457182010-08-05 23:09:48 +10002362 c->self, win_len, c->local_window);
Damien Miller33b13562000-04-04 14:38:59 +10002363 return;
2364 }
Damien Miller7d457182010-08-05 23:09:48 +10002365 c->local_window -= win_len;
Damien Miller33b13562000-04-04 14:38:59 +10002366 }
Damien Millerd27b9472005-12-13 19:29:02 +11002367 if (c->datagram)
2368 buffer_put_string(&c->output, data, data_len);
2369 else
2370 buffer_append(&c->output, data, data_len);
Damien Millerdb255ca2008-05-19 14:59:37 +10002371 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002372}
Ben Lindstrome9c99912001-06-09 00:41:05 +00002373
Damien Millerd79b4242006-03-31 23:11:44 +11002374/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002375void
Damien Miller630d6f42002-01-22 23:17:30 +11002376channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002377{
2378 int id;
Damien Miller33b13562000-04-04 14:38:59 +10002379 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00002380 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10002381 Channel *c;
2382
2383 /* Get the channel number and verify it. */
2384 id = packet_get_int();
2385 c = channel_lookup(id);
2386
2387 if (c == NULL)
2388 packet_disconnect("Received extended_data for bad channel %d.", id);
2389 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002390 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10002391 return;
2392 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002393 if (c->flags & CHAN_EOF_RCVD) {
2394 if (datafellows & SSH_BUG_EXTEOF)
2395 debug("channel %d: accepting ext data after eof", id);
2396 else
2397 packet_disconnect("Received extended_data after EOF "
2398 "on channel %d.", id);
2399 }
Damien Miller33b13562000-04-04 14:38:59 +10002400 tcode = packet_get_int();
2401 if (c->efd == -1 ||
2402 c->extended_usage != CHAN_EXTENDED_WRITE ||
2403 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002404 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002405 return;
2406 }
2407 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002408 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002409 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002410 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002411 c->self, data_len, c->local_window);
Darren Tuckera627d422013-06-02 07:31:17 +10002412 free(data);
Damien Miller33b13562000-04-04 14:38:59 +10002413 return;
2414 }
Damien Millerd3444942000-09-30 14:20:03 +11002415 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002416 c->local_window -= data_len;
2417 buffer_append(&c->extended, data, data_len);
Darren Tuckera627d422013-06-02 07:31:17 +10002418 free(data);
Damien Miller33b13562000-04-04 14:38:59 +10002419}
2420
Damien Millerd79b4242006-03-31 23:11:44 +11002421/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002422void
Damien Miller630d6f42002-01-22 23:17:30 +11002423channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002424{
2425 int id;
2426 Channel *c;
2427
Damien Millerb38eff82000-04-01 11:09:21 +10002428 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002429 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002430 c = channel_lookup(id);
2431 if (c == NULL)
2432 packet_disconnect("Received ieof for nonexistent channel %d.", id);
2433 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002434
2435 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002436 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002437 debug("channel %d: FORCE input drain", c->self);
2438 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002439 if (buffer_len(&c->input) == 0)
2440 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002441 }
2442
Damien Millerb38eff82000-04-01 11:09:21 +10002443}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002444
Damien Millerd79b4242006-03-31 23:11:44 +11002445/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002446void
Damien Miller630d6f42002-01-22 23:17:30 +11002447channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002448{
Damien Millerb38eff82000-04-01 11:09:21 +10002449 int id;
2450 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002451
Damien Millerb38eff82000-04-01 11:09:21 +10002452 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002453 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002454 c = channel_lookup(id);
2455 if (c == NULL)
2456 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002457
2458 /*
2459 * Send a confirmation that we have closed the channel and no more
2460 * data is coming for it.
2461 */
Damien Miller95def091999-11-25 00:26:21 +11002462 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002463 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002464 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002465
Damien Miller5428f641999-11-25 11:54:57 +11002466 /*
2467 * If the channel is in closed state, we have sent a close request,
2468 * and the other side will eventually respond with a confirmation.
2469 * Thus, we cannot free the channel here, because then there would be
2470 * no-one to receive the confirmation. The channel gets freed when
2471 * the confirmation arrives.
2472 */
Damien Millerb38eff82000-04-01 11:09:21 +10002473 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002474 /*
2475 * Not a closed channel - mark it as draining, which will
2476 * cause it to be freed later.
2477 */
Damien Miller76765c02002-01-22 23:21:15 +11002478 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002479 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002480 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002481}
2482
Damien Millerb38eff82000-04-01 11:09:21 +10002483/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Millerd79b4242006-03-31 23:11:44 +11002484/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002485void
Damien Miller630d6f42002-01-22 23:17:30 +11002486channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002487{
Damien Millerb38eff82000-04-01 11:09:21 +10002488 int id = packet_get_int();
2489 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002490
Damien Miller48b03fc2002-01-22 23:11:40 +11002491 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002492 if (c == NULL)
2493 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2494 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002495}
2496
Damien Millerd79b4242006-03-31 23:11:44 +11002497/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002498void
Damien Miller630d6f42002-01-22 23:17:30 +11002499channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002500{
2501 int id = packet_get_int();
2502 Channel *c = channel_lookup(id);
2503
Damien Miller48b03fc2002-01-22 23:11:40 +11002504 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002505 if (c == NULL)
2506 packet_disconnect("Received close confirmation for "
2507 "out-of-range channel %d.", id);
Damien Miller36187092013-06-10 13:07:11 +10002508 if (c->type != SSH_CHANNEL_CLOSED && c->type != SSH_CHANNEL_ABANDONED)
Damien Millerb38eff82000-04-01 11:09:21 +10002509 packet_disconnect("Received close confirmation for "
2510 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002511 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002512}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002513
Damien Millerd79b4242006-03-31 23:11:44 +11002514/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002515void
Damien Miller630d6f42002-01-22 23:17:30 +11002516channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002517{
Damien Millerb38eff82000-04-01 11:09:21 +10002518 int id, remote_id;
2519 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002520
Damien Millerb38eff82000-04-01 11:09:21 +10002521 id = packet_get_int();
2522 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002523
Damien Millerb38eff82000-04-01 11:09:21 +10002524 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2525 packet_disconnect("Received open confirmation for "
2526 "non-opening channel %d.", id);
2527 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002528 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002529 c->remote_id = remote_id;
2530 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002531
2532 if (compat20) {
2533 c->remote_window = packet_get_int();
2534 c->remote_maxpacket = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002535 if (c->open_confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002536 debug2("callback start");
Damien Millerd530f5f2010-05-21 14:57:10 +10002537 c->open_confirm(c->self, 1, c->open_confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002538 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002539 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002540 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002541 c->remote_window, c->remote_maxpacket);
2542 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002543 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002544}
2545
Ben Lindstrombba81212001-06-25 05:01:22 +00002546static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002547reason2txt(int reason)
2548{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002549 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002550 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2551 return "administratively prohibited";
2552 case SSH2_OPEN_CONNECT_FAILED:
2553 return "connect failed";
2554 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2555 return "unknown channel type";
2556 case SSH2_OPEN_RESOURCE_SHORTAGE:
2557 return "resource shortage";
2558 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002559 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002560}
2561
Damien Millerd79b4242006-03-31 23:11:44 +11002562/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002563void
Damien Miller630d6f42002-01-22 23:17:30 +11002564channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002565{
Kevin Steves12057502001-02-05 14:54:34 +00002566 int id, reason;
2567 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002568 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002569
Damien Millerb38eff82000-04-01 11:09:21 +10002570 id = packet_get_int();
2571 c = channel_lookup(id);
2572
2573 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2574 packet_disconnect("Received open failure for "
2575 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002576 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002577 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002578 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002579 msg = packet_get_string(NULL);
2580 lang = packet_get_string(NULL);
2581 }
Damien Miller996acd22003-04-09 20:59:48 +10002582 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002583 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Darren Tuckera627d422013-06-02 07:31:17 +10002584 free(msg);
2585 free(lang);
Damien Millerd530f5f2010-05-21 14:57:10 +10002586 if (c->open_confirm) {
2587 debug2("callback start");
2588 c->open_confirm(c->self, 0, c->open_confirm_ctx);
2589 debug2("callback done");
2590 }
Damien Miller33b13562000-04-04 14:38:59 +10002591 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002592 packet_check_eom();
Damien Miller7a606212009-01-28 16:22:34 +11002593 /* Schedule the channel for cleanup/deletion. */
2594 chan_mark_dead(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002595}
2596
Damien Millerd79b4242006-03-31 23:11:44 +11002597/* ARGSUSED */
Damien Miller33b13562000-04-04 14:38:59 +10002598void
Damien Miller630d6f42002-01-22 23:17:30 +11002599channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002600{
2601 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002602 int id;
2603 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002604
2605 if (!compat20)
2606 return;
2607
2608 /* Get the channel number and verify it. */
2609 id = packet_get_int();
2610 c = channel_lookup(id);
2611
Damien Millerd47c62a2005-12-13 19:33:57 +11002612 if (c == NULL) {
2613 logit("Received window adjust for non-open channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002614 return;
2615 }
2616 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002617 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002618 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002619 c->remote_window += adjust;
2620}
2621
Damien Millerd79b4242006-03-31 23:11:44 +11002622/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002623void
Damien Miller630d6f42002-01-22 23:17:30 +11002624channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002625{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002626 Channel *c = NULL;
2627 u_short host_port;
2628 char *host, *originator_string;
Damien Millerbd740252008-05-19 15:37:09 +10002629 int remote_id;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002630
Ben Lindstrome9c99912001-06-09 00:41:05 +00002631 remote_id = packet_get_int();
2632 host = packet_get_string(NULL);
2633 host_port = packet_get_int();
2634
2635 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2636 originator_string = packet_get_string(NULL);
2637 } else {
2638 originator_string = xstrdup("unknown (remote did not supply name)");
2639 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002640 packet_check_eom();
Damien Millerbd740252008-05-19 15:37:09 +10002641 c = channel_connect_to(host, host_port,
2642 "connected socket", originator_string);
Darren Tuckera627d422013-06-02 07:31:17 +10002643 free(originator_string);
2644 free(host);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002645 if (c == NULL) {
2646 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2647 packet_put_int(remote_id);
2648 packet_send();
Damien Millerbd740252008-05-19 15:37:09 +10002649 } else
2650 c->remote_id = remote_id;
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002651}
2652
Damien Millerb84886b2008-05-19 15:05:07 +10002653/* ARGSUSED */
2654void
2655channel_input_status_confirm(int type, u_int32_t seq, void *ctxt)
2656{
2657 Channel *c;
2658 struct channel_confirm *cc;
Damien Miller16a73072008-12-08 09:55:25 +11002659 int id;
Damien Millerb84886b2008-05-19 15:05:07 +10002660
2661 /* Reset keepalive timeout */
Darren Tuckerf7288d72009-06-21 18:12:20 +10002662 packet_set_alive_timeouts(0);
Damien Millerb84886b2008-05-19 15:05:07 +10002663
Damien Miller16a73072008-12-08 09:55:25 +11002664 id = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002665 packet_check_eom();
2666
Damien Miller16a73072008-12-08 09:55:25 +11002667 debug2("channel_input_status_confirm: type %d id %d", type, id);
Damien Millerb84886b2008-05-19 15:05:07 +10002668
Damien Miller16a73072008-12-08 09:55:25 +11002669 if ((c = channel_lookup(id)) == NULL) {
2670 logit("channel_input_status_confirm: %d: unknown", id);
Damien Millerb84886b2008-05-19 15:05:07 +10002671 return;
2672 }
2673 ;
2674 if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
2675 return;
2676 cc->cb(type, c, cc->ctx);
2677 TAILQ_REMOVE(&c->status_confirms, cc, entry);
Damien Miller1d2c4562014-02-04 11:18:20 +11002678 explicit_bzero(cc, sizeof(*cc));
Darren Tuckera627d422013-06-02 07:31:17 +10002679 free(cc);
Damien Millerb84886b2008-05-19 15:05:07 +10002680}
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002681
Ben Lindstrome9c99912001-06-09 00:41:05 +00002682/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002683
Ben Lindstrom908afed2001-10-03 17:34:59 +00002684void
2685channel_set_af(int af)
2686{
2687 IPv4or6 = af;
2688}
2689
Damien Millerf6dff7c2011-09-22 21:38:52 +10002690
2691/*
2692 * Determine whether or not a port forward listens to loopback, the
2693 * specified address or wildcard. On the client, a specified bind
2694 * address will always override gateway_ports. On the server, a
2695 * gateway_ports of 1 (``yes'') will override the client's specification
2696 * and force a wildcard bind, whereas a value of 2 (``clientspecified'')
2697 * will bind to whatever address the client asked for.
2698 *
2699 * Special-case listen_addrs are:
2700 *
2701 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2702 * "" (empty string), "*" -> wildcard v4/v6
2703 * "localhost" -> loopback v4/v6
2704 */
2705static const char *
2706channel_fwd_bind_addr(const char *listen_addr, int *wildcardp,
2707 int is_client, int gateway_ports)
2708{
2709 const char *addr = NULL;
2710 int wildcard = 0;
2711
2712 if (listen_addr == NULL) {
2713 /* No address specified: default to gateway_ports setting */
2714 if (gateway_ports)
2715 wildcard = 1;
2716 } else if (gateway_ports || is_client) {
2717 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
2718 strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
2719 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
Darren Tucker71152bc2013-10-10 10:27:21 +11002720 (!is_client && gateway_ports == 1)) {
Damien Millerf6dff7c2011-09-22 21:38:52 +10002721 wildcard = 1;
Darren Tucker71152bc2013-10-10 10:27:21 +11002722 /*
2723 * Notify client if they requested a specific listen
2724 * address and it was overridden.
2725 */
2726 if (*listen_addr != '\0' &&
2727 strcmp(listen_addr, "0.0.0.0") != 0 &&
2728 strcmp(listen_addr, "*") != 0) {
2729 packet_send_debug("Forwarding listen address "
2730 "\"%s\" overridden by server "
2731 "GatewayPorts", listen_addr);
2732 }
Damien Miller795b8632014-05-21 17:12:53 +10002733 }
Damien Millere84d1032014-05-21 17:13:36 +10002734 else if (strcmp(listen_addr, "localhost") != 0)
2735 addr = listen_addr;
Damien Millerf6dff7c2011-09-22 21:38:52 +10002736 }
2737 if (wildcardp != NULL)
2738 *wildcardp = wildcard;
2739 return addr;
2740}
2741
Damien Millerb16461c2002-01-22 23:29:22 +11002742static int
Damien Miller4bf648f2009-02-14 16:28:21 +11002743channel_setup_fwd_listener(int type, const char *listen_addr,
2744 u_short listen_port, int *allocated_listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002745 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002746{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002747 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002748 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002749 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002750 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002751 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller4bf648f2009-02-14 16:28:21 +11002752 in_port_t *lport_p;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002753
Damien Millerb16461c2002-01-22 23:29:22 +11002754 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2755 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002756 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002757
Damien Millerb16461c2002-01-22 23:29:22 +11002758 if (host == NULL) {
2759 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002760 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002761 }
Damien Miller9576ac42009-01-28 16:30:33 +11002762 if (strlen(host) >= NI_MAXHOST) {
Kevin Steves12057502001-02-05 14:54:34 +00002763 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002764 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002765 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002766
Damien Millerf6dff7c2011-09-22 21:38:52 +10002767 /* Determine the bind address, cf. channel_fwd_bind_addr() comment */
2768 addr = channel_fwd_bind_addr(listen_addr, &wildcard,
2769 is_client, gateway_ports);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002770 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2771 type, wildcard, (addr == NULL) ? "NULL" : addr);
2772
2773 /*
Damien Miller34132e52000-01-14 15:45:46 +11002774 * getaddrinfo returns a loopback address if the hostname is
2775 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002776 */
Damien Miller34132e52000-01-14 15:45:46 +11002777 memset(&hints, 0, sizeof(hints));
2778 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002779 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002780 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002781 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002782 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2783 if (addr == NULL) {
2784 /* This really shouldn't happen */
2785 packet_disconnect("getaddrinfo: fatal error: %s",
Darren Tucker4abde772007-12-29 02:43:51 +11002786 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002787 } else {
Damien Millera7270302005-07-06 09:36:05 +10002788 error("channel_setup_fwd_listener: "
Darren Tucker4abde772007-12-29 02:43:51 +11002789 "getaddrinfo(%.64s): %s", addr,
2790 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002791 }
Damien Millera7270302005-07-06 09:36:05 +10002792 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002793 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002794 if (allocated_listen_port != NULL)
2795 *allocated_listen_port = 0;
Damien Miller34132e52000-01-14 15:45:46 +11002796 for (ai = aitop; ai; ai = ai->ai_next) {
Damien Miller4bf648f2009-02-14 16:28:21 +11002797 switch (ai->ai_family) {
2798 case AF_INET:
2799 lport_p = &((struct sockaddr_in *)ai->ai_addr)->
2800 sin_port;
2801 break;
2802 case AF_INET6:
2803 lport_p = &((struct sockaddr_in6 *)ai->ai_addr)->
2804 sin6_port;
2805 break;
2806 default:
Damien Miller34132e52000-01-14 15:45:46 +11002807 continue;
Damien Miller4bf648f2009-02-14 16:28:21 +11002808 }
2809 /*
2810 * If allocating a port for -R forwards, then use the
2811 * same port for all address families.
2812 */
2813 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2814 allocated_listen_port != NULL && *allocated_listen_port > 0)
2815 *lport_p = htons(*allocated_listen_port);
2816
Damien Miller34132e52000-01-14 15:45:46 +11002817 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2818 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002819 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002820 continue;
2821 }
2822 /* Create a port to listen for the host. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11002823 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002824 if (sock < 0) {
2825 /* this is no error since kernel may not support ipv6 */
2826 verbose("socket: %.100s", strerror(errno));
2827 continue;
2828 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002829
2830 channel_set_reuseaddr(sock);
Damien Miller04ee0f82009-11-18 17:48:30 +11002831 if (ai->ai_family == AF_INET6)
2832 sock_set_v6only(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002833
Damien Miller4bf648f2009-02-14 16:28:21 +11002834 debug("Local forwarding listening on %s port %s.",
2835 ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002836
Damien Miller34132e52000-01-14 15:45:46 +11002837 /* Bind the socket to the address. */
2838 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2839 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002840 if (!ai->ai_next)
2841 error("bind: %.100s", strerror(errno));
2842 else
2843 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002844
Damien Miller34132e52000-01-14 15:45:46 +11002845 close(sock);
2846 continue;
2847 }
2848 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002849 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002850 error("listen: %.100s", strerror(errno));
2851 close(sock);
2852 continue;
2853 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002854
2855 /*
2856 * listen_port == 0 requests a dynamically allocated port -
2857 * record what we got.
2858 */
2859 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2860 allocated_listen_port != NULL &&
2861 *allocated_listen_port == 0) {
2862 *allocated_listen_port = get_sock_port(sock, 1);
2863 debug("Allocated listen port %d",
2864 *allocated_listen_port);
2865 }
2866
Damien Miller34132e52000-01-14 15:45:46 +11002867 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002868 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002869 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002870 0, "port listener", 1);
Damien Millera1c1b6c2009-01-28 16:29:49 +11002871 c->path = xstrdup(host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002872 c->host_port = port_to_connect;
Damien Millerf6dff7c2011-09-22 21:38:52 +10002873 c->listening_addr = addr == NULL ? NULL : xstrdup(addr);
Darren Tucker68afb8c2011-10-02 18:59:03 +11002874 if (listen_port == 0 && allocated_listen_port != NULL &&
2875 !(datafellows & SSH_BUG_DYNAMIC_RPORT))
2876 c->listening_port = *allocated_listen_port;
2877 else
2878 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002879 success = 1;
2880 }
2881 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002882 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002883 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002884 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002885 return success;
Damien Miller95def091999-11-25 00:26:21 +11002886}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002887
Darren Tuckere7066df2004-05-24 10:18:05 +10002888int
2889channel_cancel_rport_listener(const char *host, u_short port)
2890{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002891 u_int i;
2892 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002893
Darren Tucker47eede72005-03-14 23:08:12 +11002894 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002895 Channel *c = channels[i];
Damien Millerf6dff7c2011-09-22 21:38:52 +10002896 if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER)
2897 continue;
2898 if (strcmp(c->path, host) == 0 && c->listening_port == port) {
2899 debug2("%s: close channel %d", __func__, i);
2900 channel_free(c);
2901 found = 1;
2902 }
2903 }
Darren Tuckere7066df2004-05-24 10:18:05 +10002904
Damien Millerf6dff7c2011-09-22 21:38:52 +10002905 return (found);
2906}
2907
2908int
2909channel_cancel_lport_listener(const char *lhost, u_short lport,
Damien Millerff773642011-09-22 21:39:48 +10002910 int cport, int gateway_ports)
Damien Millerf6dff7c2011-09-22 21:38:52 +10002911{
2912 u_int i;
2913 int found = 0;
2914 const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, gateway_ports);
2915
2916 for (i = 0; i < channels_alloc; i++) {
2917 Channel *c = channels[i];
2918 if (c == NULL || c->type != SSH_CHANNEL_PORT_LISTENER)
2919 continue;
Damien Millerff773642011-09-22 21:39:48 +10002920 if (c->listening_port != lport)
Damien Millerf6dff7c2011-09-22 21:38:52 +10002921 continue;
Damien Millerff773642011-09-22 21:39:48 +10002922 if (cport == CHANNEL_CANCEL_PORT_STATIC) {
2923 /* skip dynamic forwardings */
2924 if (c->host_port == 0)
2925 continue;
2926 } else {
2927 if (c->host_port != cport)
2928 continue;
2929 }
Damien Millerf6dff7c2011-09-22 21:38:52 +10002930 if ((c->listening_addr == NULL && addr != NULL) ||
2931 (c->listening_addr != NULL && addr == NULL))
2932 continue;
2933 if (addr == NULL || strcmp(c->listening_addr, addr) == 0) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002934 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002935 channel_free(c);
2936 found = 1;
2937 }
2938 }
2939
2940 return (found);
2941}
2942
Damien Millerb16461c2002-01-22 23:29:22 +11002943/* protocol local port fwd, used by ssh (and sshd in v1) */
2944int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002945channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002946 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2947{
2948 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002949 listen_host, listen_port, NULL, host_to_connect, port_to_connect,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002950 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002951}
2952
2953/* protocol v2 remote port fwd, used by sshd */
2954int
2955channel_setup_remote_fwd_listener(const char *listen_address,
Damien Miller4bf648f2009-02-14 16:28:21 +11002956 u_short listen_port, int *allocated_listen_port, int gateway_ports)
Damien Millerb16461c2002-01-22 23:29:22 +11002957{
2958 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002959 listen_address, listen_port, allocated_listen_port,
2960 NULL, 0, gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002961}
2962
Damien Miller5428f641999-11-25 11:54:57 +11002963/*
Damien Millerf6dff7c2011-09-22 21:38:52 +10002964 * Translate the requested rfwd listen host to something usable for
2965 * this server.
2966 */
2967static const char *
2968channel_rfwd_bind_host(const char *listen_host)
2969{
2970 if (listen_host == NULL) {
2971 if (datafellows & SSH_BUG_RFWD_ADDR)
2972 return "127.0.0.1";
2973 else
2974 return "localhost";
2975 } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) {
2976 if (datafellows & SSH_BUG_RFWD_ADDR)
2977 return "0.0.0.0";
2978 else
2979 return "";
2980 } else
2981 return listen_host;
2982}
2983
2984/*
Damien Miller5428f641999-11-25 11:54:57 +11002985 * Initiate forwarding of connections to port "port" on remote host through
2986 * the secure channel to host:port from local side.
Darren Tucker68afb8c2011-10-02 18:59:03 +11002987 * Returns handle (index) for updating the dynamic listen port with
2988 * channel_update_permitted_opens().
Damien Miller5428f641999-11-25 11:54:57 +11002989 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10002990int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002991channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002992 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002993{
Darren Tucker68afb8c2011-10-02 18:59:03 +11002994 int type, success = 0, idx = -1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002995
Damien Miller95def091999-11-25 00:26:21 +11002996 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002997 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10002998 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2999 packet_put_cstring("tcpip-forward");
Damien Millerf6dff7c2011-09-22 21:38:52 +10003000 packet_put_char(1); /* boolean: want reply */
3001 packet_put_cstring(channel_rfwd_bind_host(listen_host));
Damien Miller33b13562000-04-04 14:38:59 +10003002 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11003003 packet_send();
3004 packet_write_wait();
3005 /* Assume that server accepts the request */
3006 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10003007 } else {
3008 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10003009 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10003010 packet_put_cstring(host_to_connect);
3011 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10003012 packet_send();
3013 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11003014
3015 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11003016 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11003017 switch (type) {
3018 case SSH_SMSG_SUCCESS:
3019 success = 1;
3020 break;
3021 case SSH_SMSG_FAILURE:
Damien Miller0bc1bd82000-11-13 22:57:25 +11003022 break;
3023 default:
3024 /* Unknown packet */
3025 packet_disconnect("Protocol error for port forward request:"
3026 "received packet type %d.", type);
3027 }
3028 }
3029 if (success) {
Damien Miller232cfb12010-06-26 09:50:30 +10003030 /* Record that connection to this host/port is permitted. */
3031 permitted_opens = xrealloc(permitted_opens,
3032 num_permitted_opens + 1, sizeof(*permitted_opens));
Darren Tucker68afb8c2011-10-02 18:59:03 +11003033 idx = num_permitted_opens++;
3034 permitted_opens[idx].host_to_connect = xstrdup(host_to_connect);
3035 permitted_opens[idx].port_to_connect = port_to_connect;
Damien Miller4b3ed642014-07-02 15:29:40 +10003036 permitted_opens[idx].listen_host = listen_host ?
3037 xstrdup(listen_host) : NULL;
Darren Tucker68afb8c2011-10-02 18:59:03 +11003038 permitted_opens[idx].listen_port = listen_port;
Damien Miller33b13562000-04-04 14:38:59 +10003039 }
Darren Tucker68afb8c2011-10-02 18:59:03 +11003040 return (idx);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003041}
3042
Damien Miller4b3ed642014-07-02 15:29:40 +10003043static int
3044open_match(ForwardPermission *allowed_open, const char *requestedhost,
3045 u_short requestedport)
3046{
3047 if (allowed_open->host_to_connect == NULL)
3048 return 0;
3049 if (allowed_open->port_to_connect != FWD_PERMIT_ANY_PORT &&
3050 allowed_open->port_to_connect != requestedport)
3051 return 0;
3052 if (strcmp(allowed_open->host_to_connect, requestedhost) != 0)
3053 return 0;
3054 return 1;
3055}
3056
3057/*
3058 * Note that in he listen host/port case
3059 * we don't support FWD_PERMIT_ANY_PORT and
3060 * need to translate between the configured-host (listen_host)
3061 * and what we've sent to the remote server (channel_rfwd_bind_host)
3062 */
3063static int
3064open_listen_match(ForwardPermission *allowed_open, const char *requestedhost,
3065 u_short requestedport, int translate)
3066{
3067 const char *allowed_host;
3068
3069 if (allowed_open->host_to_connect == NULL)
3070 return 0;
3071 if (allowed_open->listen_port != requestedport)
3072 return 0;
3073 allowed_host = translate ?
3074 channel_rfwd_bind_host(allowed_open->listen_host) :
3075 allowed_open->listen_host;
3076 if (allowed_host == NULL ||
3077 strcmp(allowed_host, requestedhost) != 0)
3078 return 0;
3079 return 1;
3080}
3081
Damien Miller5428f641999-11-25 11:54:57 +11003082/*
Darren Tuckerfc959702004-07-17 16:12:08 +10003083 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10003084 * local side.
3085 */
Damien Millerf6dff7c2011-09-22 21:38:52 +10003086int
Damien Millerf91ee4c2005-03-01 21:24:33 +11003087channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10003088{
3089 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10003090
3091 if (!compat20)
Damien Millerf6dff7c2011-09-22 21:38:52 +10003092 return -1;
Darren Tuckere7066df2004-05-24 10:18:05 +10003093
3094 for (i = 0; i < num_permitted_opens; i++) {
Damien Miller4b3ed642014-07-02 15:29:40 +10003095 if (open_listen_match(&permitted_opens[i], host, port, 0))
Darren Tuckere7066df2004-05-24 10:18:05 +10003096 break;
3097 }
3098 if (i >= num_permitted_opens) {
3099 debug("%s: requested forward not found", __func__);
Damien Millerf6dff7c2011-09-22 21:38:52 +10003100 return -1;
Darren Tuckere7066df2004-05-24 10:18:05 +10003101 }
3102 packet_start(SSH2_MSG_GLOBAL_REQUEST);
3103 packet_put_cstring("cancel-tcpip-forward");
3104 packet_put_char(0);
Damien Millerf6dff7c2011-09-22 21:38:52 +10003105 packet_put_cstring(channel_rfwd_bind_host(host));
Darren Tuckere7066df2004-05-24 10:18:05 +10003106 packet_put_int(port);
3107 packet_send();
3108
Darren Tuckere7066df2004-05-24 10:18:05 +10003109 permitted_opens[i].port_to_connect = 0;
Damien Miller4b3ed642014-07-02 15:29:40 +10003110 permitted_opens[i].listen_port = 0;
Darren Tuckera627d422013-06-02 07:31:17 +10003111 free(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10003112 permitted_opens[i].host_to_connect = NULL;
Damien Miller4b3ed642014-07-02 15:29:40 +10003113 free(permitted_opens[i].listen_host);
3114 permitted_opens[i].listen_host = NULL;
Damien Millerf6dff7c2011-09-22 21:38:52 +10003115
3116 return 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10003117}
3118
3119/*
Damien Miller5428f641999-11-25 11:54:57 +11003120 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
3121 * listening for the port, and sends back a success reply (or disconnect
Darren Tuckere7d4b192006-07-12 22:17:10 +10003122 * message if there was an error).
Damien Miller5428f641999-11-25 11:54:57 +11003123 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10003124int
Damien Millere247cc42000-05-07 12:03:14 +10003125channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003126{
Damien Milleraae6c611999-12-06 11:47:28 +11003127 u_short port, host_port;
Darren Tuckere7d4b192006-07-12 22:17:10 +10003128 int success = 0;
Damien Miller95def091999-11-25 00:26:21 +11003129 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003130
Damien Miller95def091999-11-25 00:26:21 +11003131 /* Get arguments from the packet. */
3132 port = packet_get_int();
3133 hostname = packet_get_string(NULL);
3134 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003135
Damien Millerbac2d8a2000-09-05 16:13:06 +11003136#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11003137 /*
3138 * Check that an unprivileged user is not trying to forward a
3139 * privileged port.
3140 */
Damien Miller95def091999-11-25 00:26:21 +11003141 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10003142 packet_disconnect(
3143 "Requested forwarding of port %d but user is not root.",
3144 port);
3145 if (host_port == 0)
3146 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11003147#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10003148
Damien Miller0bc1bd82000-11-13 22:57:25 +11003149 /* Initiate forwarding */
Darren Tuckere7d4b192006-07-12 22:17:10 +10003150 success = channel_setup_local_fwd_listener(NULL, port, hostname,
Damien Millerf91ee4c2005-03-01 21:24:33 +11003151 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11003152
3153 /* Free the argument string. */
Darren Tuckera627d422013-06-02 07:31:17 +10003154 free(hostname);
Darren Tuckere7d4b192006-07-12 22:17:10 +10003155
3156 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003157}
3158
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003159/*
3160 * Permits opening to any host/port if permitted_opens[] is empty. This is
3161 * usually called by the server, because the user could connect to any port
3162 * anyway, and the server has no way to know but to trust the client anyway.
3163 */
3164void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003165channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003166{
3167 if (num_permitted_opens == 0)
3168 all_opens_permitted = 1;
3169}
3170
Ben Lindstroma3700052001-04-05 23:26:32 +00003171void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003172channel_add_permitted_opens(char *host, int port)
3173{
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003174 debug("allow port forwarding to host %s port %d", host, port);
3175
Damien Miller232cfb12010-06-26 09:50:30 +10003176 permitted_opens = xrealloc(permitted_opens,
3177 num_permitted_opens + 1, sizeof(*permitted_opens));
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003178 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
3179 permitted_opens[num_permitted_opens].port_to_connect = port;
Damien Miller4b3ed642014-07-02 15:29:40 +10003180 permitted_opens[num_permitted_opens].listen_host = NULL;
3181 permitted_opens[num_permitted_opens].listen_port = 0;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003182 num_permitted_opens++;
3183
3184 all_opens_permitted = 0;
3185}
3186
Darren Tucker68afb8c2011-10-02 18:59:03 +11003187/*
3188 * Update the listen port for a dynamic remote forward, after
3189 * the actual 'newport' has been allocated. If 'newport' < 0 is
3190 * passed then they entry will be invalidated.
3191 */
3192void
3193channel_update_permitted_opens(int idx, int newport)
3194{
3195 if (idx < 0 || idx >= num_permitted_opens) {
3196 debug("channel_update_permitted_opens: index out of range:"
3197 " %d num_permitted_opens %d", idx, num_permitted_opens);
3198 return;
3199 }
3200 debug("%s allowed port %d for forwarding to host %s port %d",
3201 newport > 0 ? "Updating" : "Removing",
3202 newport,
3203 permitted_opens[idx].host_to_connect,
3204 permitted_opens[idx].port_to_connect);
3205 if (newport >= 0) {
3206 permitted_opens[idx].listen_port =
3207 (datafellows & SSH_BUG_DYNAMIC_RPORT) ? 0 : newport;
3208 } else {
3209 permitted_opens[idx].listen_port = 0;
3210 permitted_opens[idx].port_to_connect = 0;
Darren Tuckera627d422013-06-02 07:31:17 +10003211 free(permitted_opens[idx].host_to_connect);
Darren Tucker68afb8c2011-10-02 18:59:03 +11003212 permitted_opens[idx].host_to_connect = NULL;
Damien Miller4b3ed642014-07-02 15:29:40 +10003213 free(permitted_opens[idx].listen_host);
3214 permitted_opens[idx].listen_host = NULL;
Darren Tucker68afb8c2011-10-02 18:59:03 +11003215 }
3216}
3217
Damien Millera765cf42006-07-24 14:08:13 +10003218int
Damien Miller9b439df2006-07-24 14:04:00 +10003219channel_add_adm_permitted_opens(char *host, int port)
3220{
Damien Millera765cf42006-07-24 14:08:13 +10003221 debug("config allows port forwarding to host %s port %d", host, port);
Damien Miller9b439df2006-07-24 14:04:00 +10003222
Damien Miller232cfb12010-06-26 09:50:30 +10003223 permitted_adm_opens = xrealloc(permitted_adm_opens,
3224 num_adm_permitted_opens + 1, sizeof(*permitted_adm_opens));
Damien Miller9b439df2006-07-24 14:04:00 +10003225 permitted_adm_opens[num_adm_permitted_opens].host_to_connect
3226 = xstrdup(host);
3227 permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
Damien Miller4b3ed642014-07-02 15:29:40 +10003228 permitted_adm_opens[num_adm_permitted_opens].listen_host = NULL;
3229 permitted_adm_opens[num_adm_permitted_opens].listen_port = 0;
Damien Millera765cf42006-07-24 14:08:13 +10003230 return ++num_adm_permitted_opens;
Damien Miller9b439df2006-07-24 14:04:00 +10003231}
3232
3233void
Damien Millerc6081482012-04-22 11:18:53 +10003234channel_disable_adm_local_opens(void)
3235{
Damien Milleraa5b3f82012-12-03 09:50:54 +11003236 channel_clear_adm_permitted_opens();
3237 permitted_adm_opens = xmalloc(sizeof(*permitted_adm_opens));
3238 permitted_adm_opens[num_adm_permitted_opens].host_to_connect = NULL;
3239 num_adm_permitted_opens = 1;
Damien Millerc6081482012-04-22 11:18:53 +10003240}
3241
3242void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003243channel_clear_permitted_opens(void)
3244{
3245 int i;
3246
Damien Miller4b3ed642014-07-02 15:29:40 +10003247 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10003248 free(permitted_opens[i].host_to_connect);
Damien Miller4b3ed642014-07-02 15:29:40 +10003249 free(permitted_opens[i].listen_host);
3250 }
Darren Tuckera627d422013-06-02 07:31:17 +10003251 free(permitted_opens);
3252 permitted_opens = NULL;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003253 num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +10003254}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003255
Damien Miller9b439df2006-07-24 14:04:00 +10003256void
3257channel_clear_adm_permitted_opens(void)
3258{
3259 int i;
3260
Damien Miller4b3ed642014-07-02 15:29:40 +10003261 for (i = 0; i < num_adm_permitted_opens; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10003262 free(permitted_adm_opens[i].host_to_connect);
Damien Miller4b3ed642014-07-02 15:29:40 +10003263 free(permitted_adm_opens[i].listen_host);
3264 }
Darren Tuckera627d422013-06-02 07:31:17 +10003265 free(permitted_adm_opens);
3266 permitted_adm_opens = NULL;
Damien Miller9b439df2006-07-24 14:04:00 +10003267 num_adm_permitted_opens = 0;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003268}
3269
Darren Tuckere7140f22008-06-10 23:01:51 +10003270void
3271channel_print_adm_permitted_opens(void)
3272{
Damien Miller6ef17492008-07-16 22:42:06 +10003273 int i;
Darren Tuckere7140f22008-06-10 23:01:51 +10003274
Damien Millerb53d8a12009-01-28 16:13:04 +11003275 printf("permitopen");
Darren Tucker22662e82008-11-11 16:40:22 +11003276 if (num_adm_permitted_opens == 0) {
Damien Millerb53d8a12009-01-28 16:13:04 +11003277 printf(" any\n");
Darren Tucker22662e82008-11-11 16:40:22 +11003278 return;
3279 }
Darren Tuckere7140f22008-06-10 23:01:51 +10003280 for (i = 0; i < num_adm_permitted_opens; i++)
Damien Millerc6081482012-04-22 11:18:53 +10003281 if (permitted_adm_opens[i].host_to_connect == NULL)
3282 printf(" none");
3283 else
Darren Tuckere7140f22008-06-10 23:01:51 +10003284 printf(" %s:%d", permitted_adm_opens[i].host_to_connect,
3285 permitted_adm_opens[i].port_to_connect);
Damien Millerb53d8a12009-01-28 16:13:04 +11003286 printf("\n");
Darren Tuckere7140f22008-06-10 23:01:51 +10003287}
3288
Darren Tucker1338b9e2011-10-02 18:57:35 +11003289/* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */
3290int
3291permitopen_port(const char *p)
3292{
3293 int port;
3294
3295 if (strcmp(p, "*") == 0)
3296 return FWD_PERMIT_ANY_PORT;
3297 if ((port = a2port(p)) > 0)
3298 return port;
3299 return -1;
3300}
3301
Damien Millerbd740252008-05-19 15:37:09 +10003302/* Try to start non-blocking connect to next host in cctx list */
Ben Lindstrombba81212001-06-25 05:01:22 +00003303static int
Damien Millerbd740252008-05-19 15:37:09 +10003304connect_next(struct channel_connect *cctx)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003305{
Damien Millerbd740252008-05-19 15:37:09 +10003306 int sock, saved_errno;
Damien Miller34132e52000-01-14 15:45:46 +11003307 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller95def091999-11-25 00:26:21 +11003308
Damien Millerbd740252008-05-19 15:37:09 +10003309 for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
3310 if (cctx->ai->ai_family != AF_INET &&
3311 cctx->ai->ai_family != AF_INET6)
Damien Miller34132e52000-01-14 15:45:46 +11003312 continue;
Damien Millerbd740252008-05-19 15:37:09 +10003313 if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
3314 ntop, sizeof(ntop), strport, sizeof(strport),
3315 NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
3316 error("connect_next: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11003317 continue;
3318 }
Darren Tucker7bd98e72010-01-10 10:31:12 +11003319 if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
3320 cctx->ai->ai_protocol)) == -1) {
Damien Millerbd740252008-05-19 15:37:09 +10003321 if (cctx->ai->ai_next == NULL)
Damien Millerb46b9f32003-01-10 21:45:12 +11003322 error("socket: %.100s", strerror(errno));
3323 else
3324 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003325 continue;
3326 }
Damien Miller232711f2004-06-15 10:35:30 +10003327 if (set_nonblock(sock) == -1)
3328 fatal("%s: set_nonblock(%d)", __func__, sock);
Damien Millerbd740252008-05-19 15:37:09 +10003329 if (connect(sock, cctx->ai->ai_addr,
3330 cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
3331 debug("connect_next: host %.100s ([%.100s]:%s): "
3332 "%.100s", cctx->host, ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11003333 strerror(errno));
Damien Millerbd740252008-05-19 15:37:09 +10003334 saved_errno = errno;
Damien Miller34132e52000-01-14 15:45:46 +11003335 close(sock);
Damien Millerbd740252008-05-19 15:37:09 +10003336 errno = saved_errno;
Kevin Stevesef4eea92001-02-05 12:42:17 +00003337 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11003338 }
Damien Millerbd740252008-05-19 15:37:09 +10003339 debug("connect_next: host %.100s ([%.100s]:%s) "
3340 "in progress, fd=%d", cctx->host, ntop, strport, sock);
3341 cctx->ai = cctx->ai->ai_next;
3342 set_nodelay(sock);
3343 return sock;
Damien Miller34132e52000-01-14 15:45:46 +11003344 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11003345 return -1;
3346}
Damien Millerb38eff82000-04-01 11:09:21 +10003347
Damien Millerbd740252008-05-19 15:37:09 +10003348static void
3349channel_connect_ctx_free(struct channel_connect *cctx)
3350{
Darren Tuckera627d422013-06-02 07:31:17 +10003351 free(cctx->host);
Damien Millerbd740252008-05-19 15:37:09 +10003352 if (cctx->aitop)
3353 freeaddrinfo(cctx->aitop);
Damien Miller1d2c4562014-02-04 11:18:20 +11003354 memset(cctx, 0, sizeof(*cctx));
Damien Millerbd740252008-05-19 15:37:09 +10003355}
3356
3357/* Return CONNECTING channel to remote host, port */
3358static Channel *
3359connect_to(const char *host, u_short port, char *ctype, char *rname)
3360{
3361 struct addrinfo hints;
3362 int gaierr;
3363 int sock = -1;
3364 char strport[NI_MAXSERV];
3365 struct channel_connect cctx;
3366 Channel *c;
3367
Damien Miller2bcb8662008-07-12 17:12:29 +10003368 memset(&cctx, 0, sizeof(cctx));
Damien Millerbd740252008-05-19 15:37:09 +10003369 memset(&hints, 0, sizeof(hints));
3370 hints.ai_family = IPv4or6;
3371 hints.ai_socktype = SOCK_STREAM;
3372 snprintf(strport, sizeof strport, "%d", port);
3373 if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) {
3374 error("connect_to %.100s: unknown host (%s)", host,
3375 ssh_gai_strerror(gaierr));
3376 return NULL;
3377 }
3378
3379 cctx.host = xstrdup(host);
3380 cctx.port = port;
3381 cctx.ai = cctx.aitop;
3382
3383 if ((sock = connect_next(&cctx)) == -1) {
3384 error("connect to %.100s port %d failed: %s",
3385 host, port, strerror(errno));
3386 channel_connect_ctx_free(&cctx);
3387 return NULL;
3388 }
3389 c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
3390 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
3391 c->connect_ctx = cctx;
3392 return c;
3393}
3394
3395Channel *
Damien Miller4b3ed642014-07-02 15:29:40 +10003396channel_connect_by_listen_address(const char *listen_host,
3397 u_short listen_port, char *ctype, char *rname)
Damien Millerbd740252008-05-19 15:37:09 +10003398{
3399 int i;
3400
3401 for (i = 0; i < num_permitted_opens; i++) {
Damien Miller4b3ed642014-07-02 15:29:40 +10003402 if (open_listen_match(&permitted_opens[i], listen_host,
3403 listen_port, 1)) {
Damien Millerbd740252008-05-19 15:37:09 +10003404 return connect_to(
3405 permitted_opens[i].host_to_connect,
3406 permitted_opens[i].port_to_connect, ctype, rname);
3407 }
3408 }
3409 error("WARNING: Server requests forwarding for unknown listen_port %d",
3410 listen_port);
3411 return NULL;
3412}
3413
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003414/* Check if connecting to that port is permitted and connect. */
Damien Millerbd740252008-05-19 15:37:09 +10003415Channel *
3416channel_connect_to(const char *host, u_short port, char *ctype, char *rname)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003417{
Damien Miller9b439df2006-07-24 14:04:00 +10003418 int i, permit, permit_adm = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003419
3420 permit = all_opens_permitted;
3421 if (!permit) {
3422 for (i = 0; i < num_permitted_opens; i++)
Damien Miller4b3ed642014-07-02 15:29:40 +10003423 if (open_match(&permitted_opens[i], host, port)) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003424 permit = 1;
Damien Miller4b3ed642014-07-02 15:29:40 +10003425 break;
3426 }
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003427 }
Damien Miller9b439df2006-07-24 14:04:00 +10003428
3429 if (num_adm_permitted_opens > 0) {
3430 permit_adm = 0;
3431 for (i = 0; i < num_adm_permitted_opens; i++)
Damien Miller4b3ed642014-07-02 15:29:40 +10003432 if (open_match(&permitted_adm_opens[i], host, port)) {
Damien Miller9b439df2006-07-24 14:04:00 +10003433 permit_adm = 1;
Damien Miller4b3ed642014-07-02 15:29:40 +10003434 break;
3435 }
Damien Miller9b439df2006-07-24 14:04:00 +10003436 }
3437
3438 if (!permit || !permit_adm) {
Damien Miller996acd22003-04-09 20:59:48 +10003439 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003440 "but the request was denied.", host, port);
Damien Millerbd740252008-05-19 15:37:09 +10003441 return NULL;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003442 }
Damien Millerbd740252008-05-19 15:37:09 +10003443 return connect_to(host, port, ctype, rname);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003444}
3445
Damien Miller0e220db2004-06-15 10:34:08 +10003446void
3447channel_send_window_changes(void)
3448{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10003449 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10003450 struct winsize ws;
3451
3452 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11003453 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10003454 channels[i]->type != SSH_CHANNEL_OPEN)
3455 continue;
3456 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
3457 continue;
3458 channel_request_start(i, "window-change", 0);
Damien Miller71a73672006-03-26 14:04:36 +11003459 packet_put_int((u_int)ws.ws_col);
3460 packet_put_int((u_int)ws.ws_row);
3461 packet_put_int((u_int)ws.ws_xpixel);
3462 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10003463 packet_send();
3464 }
3465}
3466
Ben Lindstrome9c99912001-06-09 00:41:05 +00003467/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003468
Damien Miller5428f641999-11-25 11:54:57 +11003469/*
3470 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003471 * Returns 0 and a suitable display number for the DISPLAY variable
3472 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11003473 */
Kevin Steves366298c2001-12-19 17:58:01 +00003474int
Damien Miller95c249f2002-02-05 12:11:34 +11003475x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10003476 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003477{
Damien Millere7378562001-12-21 14:58:35 +11003478 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11003479 int display_number, sock;
3480 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11003481 struct addrinfo hints, *ai, *aitop;
3482 char strport[NI_MAXSERV];
3483 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003484
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003485 if (chanids == NULL)
3486 return -1;
3487
Damien Millera34a28b1999-12-14 10:47:15 +11003488 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11003489 display_number < MAX_DISPLAYS;
3490 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11003491 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11003492 memset(&hints, 0, sizeof(hints));
3493 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11003494 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11003495 hints.ai_socktype = SOCK_STREAM;
3496 snprintf(strport, sizeof strport, "%d", port);
3497 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003498 error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00003499 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003500 }
Damien Miller34132e52000-01-14 15:45:46 +11003501 for (ai = aitop; ai; ai = ai->ai_next) {
3502 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
3503 continue;
Darren Tucker7bd98e72010-01-10 10:31:12 +11003504 sock = socket(ai->ai_family, ai->ai_socktype,
3505 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003506 if (sock < 0) {
Damien Miller6480c632010-03-26 11:09:44 +11003507 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)
3508#ifdef EPFNOSUPPORT
3509 && (errno != EPFNOSUPPORT)
3510#endif
3511 ) {
Damien Millere2192732000-01-17 13:22:55 +11003512 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10003513 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00003514 return -1;
Damien Millere2192732000-01-17 13:22:55 +11003515 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11003516 debug("x11_create_display_inet: Socket family %d not supported",
3517 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11003518 continue;
3519 }
Damien Miller34132e52000-01-14 15:45:46 +11003520 }
Damien Miller04ee0f82009-11-18 17:48:30 +11003521 if (ai->ai_family == AF_INET6)
3522 sock_set_v6only(sock);
Damien Miller4401e452008-06-12 06:05:12 +10003523 if (x11_use_localhost)
3524 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11003525 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003526 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003527 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11003528
Damien Miller34132e52000-01-14 15:45:46 +11003529 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11003530 close(socks[n]);
3531 }
3532 num_socks = 0;
3533 break;
3534 }
3535 socks[num_socks++] = sock;
3536 if (num_socks == NUM_SOCKS)
3537 break;
Damien Miller95def091999-11-25 00:26:21 +11003538 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00003539 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11003540 if (num_socks > 0)
3541 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003542 }
Damien Miller95def091999-11-25 00:26:21 +11003543 if (display_number >= MAX_DISPLAYS) {
3544 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00003545 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003546 }
Damien Miller95def091999-11-25 00:26:21 +11003547 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11003548 for (n = 0; n < num_socks; n++) {
3549 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11003550 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11003551 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003552 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00003553 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11003554 }
Damien Miller95def091999-11-25 00:26:21 +11003555 }
Damien Miller34132e52000-01-14 15:45:46 +11003556
Damien Miller34132e52000-01-14 15:45:46 +11003557 /* Allocate a channel for each socket. */
Damien Miller07d86be2006-03-26 14:19:21 +11003558 *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
Damien Miller34132e52000-01-14 15:45:46 +11003559 for (n = 0; n < num_socks; n++) {
3560 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11003561 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10003562 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
3563 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003564 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11003565 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003566 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11003567 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003568 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003569
Kevin Steves366298c2001-12-19 17:58:01 +00003570 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003571 *display_numberp = display_number;
3572 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003573}
3574
Ben Lindstrombba81212001-06-25 05:01:22 +00003575static int
Damien Miller819dbb62009-01-21 16:46:26 +11003576connect_local_xsocket_path(const char *pathname)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003577{
Damien Miller95def091999-11-25 00:26:21 +11003578 int sock;
3579 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003580
Damien Miller3afe3752001-12-21 12:39:51 +11003581 sock = socket(AF_UNIX, SOCK_STREAM, 0);
3582 if (sock < 0)
3583 error("socket: %.100s", strerror(errno));
3584 memset(&addr, 0, sizeof(addr));
3585 addr.sun_family = AF_UNIX;
Damien Miller819dbb62009-01-21 16:46:26 +11003586 strlcpy(addr.sun_path, pathname, sizeof addr.sun_path);
Damien Miller90967402006-03-26 14:07:26 +11003587 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
Damien Miller3afe3752001-12-21 12:39:51 +11003588 return sock;
3589 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11003590 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
3591 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003592}
3593
Damien Miller819dbb62009-01-21 16:46:26 +11003594static int
3595connect_local_xsocket(u_int dnr)
3596{
3597 char buf[1024];
3598 snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr);
3599 return connect_local_xsocket_path(buf);
3600}
3601
Damien Millerbd483e72000-04-30 10:00:53 +10003602int
3603x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003604{
Damien Miller57c4e872006-03-31 23:11:07 +11003605 u_int display_number;
Damien Miller95def091999-11-25 00:26:21 +11003606 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10003607 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11003608 struct addrinfo hints, *ai, *aitop;
3609 char strport[NI_MAXSERV];
Damien Miller57c4e872006-03-31 23:11:07 +11003610 int gaierr, sock = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003611
Damien Miller95def091999-11-25 00:26:21 +11003612 /* Try to open a socket for the local X server. */
3613 display = getenv("DISPLAY");
3614 if (!display) {
3615 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10003616 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003617 }
Damien Miller5428f641999-11-25 11:54:57 +11003618 /*
3619 * Now we decode the value of the DISPLAY variable and make a
3620 * connection to the real X server.
3621 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003622
Damien Miller819dbb62009-01-21 16:46:26 +11003623 /* Check if the display is from launchd. */
3624#ifdef __APPLE__
3625 if (strncmp(display, "/tmp/launch", 11) == 0) {
3626 sock = connect_local_xsocket_path(display);
3627 if (sock < 0)
3628 return -1;
3629
3630 /* OK, we now have a connection to the display. */
3631 return sock;
3632 }
3633#endif
Damien Miller5428f641999-11-25 11:54:57 +11003634 /*
3635 * Check if it is a unix domain socket. Unix domain displays are in
3636 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
3637 */
Damien Miller95def091999-11-25 00:26:21 +11003638 if (strncmp(display, "unix:", 5) == 0 ||
3639 display[0] == ':') {
3640 /* Connect to the unix domain socket. */
Damien Miller57c4e872006-03-31 23:11:07 +11003641 if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003642 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003643 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003644 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003645 }
3646 /* Create a socket. */
3647 sock = connect_local_xsocket(display_number);
3648 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10003649 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003650
3651 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10003652 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003653 }
Damien Miller5428f641999-11-25 11:54:57 +11003654 /*
3655 * Connect to an inet socket. The DISPLAY value is supposedly
3656 * hostname:d[.s], where hostname may also be numeric IP address.
3657 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00003658 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11003659 cp = strchr(buf, ':');
3660 if (!cp) {
3661 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10003662 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003663 }
Damien Miller95def091999-11-25 00:26:21 +11003664 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11003665 /* buf now contains the host name. But first we parse the display number. */
Damien Miller57c4e872006-03-31 23:11:07 +11003666 if (sscanf(cp + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003667 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003668 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003669 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003670 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003671
Damien Miller34132e52000-01-14 15:45:46 +11003672 /* Look up the host address */
3673 memset(&hints, 0, sizeof(hints));
3674 hints.ai_family = IPv4or6;
3675 hints.ai_socktype = SOCK_STREAM;
Damien Miller57c4e872006-03-31 23:11:07 +11003676 snprintf(strport, sizeof strport, "%u", 6000 + display_number);
Damien Miller34132e52000-01-14 15:45:46 +11003677 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003678 error("%.100s: unknown host. (%s)", buf,
3679 ssh_gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10003680 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003681 }
Damien Miller34132e52000-01-14 15:45:46 +11003682 for (ai = aitop; ai; ai = ai->ai_next) {
3683 /* Create a socket. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11003684 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003685 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003686 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10003687 continue;
3688 }
3689 /* Connect it to the display. */
3690 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Miller57c4e872006-03-31 23:11:07 +11003691 debug2("connect %.100s port %u: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10003692 6000 + display_number, strerror(errno));
3693 close(sock);
3694 continue;
3695 }
3696 /* Success */
3697 break;
Damien Miller34132e52000-01-14 15:45:46 +11003698 }
Damien Miller34132e52000-01-14 15:45:46 +11003699 freeaddrinfo(aitop);
3700 if (!ai) {
Damien Miller57c4e872006-03-31 23:11:07 +11003701 error("connect %.100s port %u: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11003702 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10003703 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003704 }
Damien Miller398e1cf2002-02-05 11:52:13 +11003705 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10003706 return sock;
3707}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003708
Damien Millerbd483e72000-04-30 10:00:53 +10003709/*
3710 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
3711 * the remote channel number. We should do whatever we want, and respond
3712 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
3713 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003714
Damien Miller8473dd82006-07-24 14:08:32 +10003715/* ARGSUSED */
Damien Millerbd483e72000-04-30 10:00:53 +10003716void
Damien Miller630d6f42002-01-22 23:17:30 +11003717x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10003718{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003719 Channel *c = NULL;
3720 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10003721 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10003722
3723 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003724
3725 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00003726
3727 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003728 remote_host = packet_get_string(NULL);
3729 } else {
3730 remote_host = xstrdup("unknown (remote did not supply name)");
3731 }
Damien Miller48b03fc2002-01-22 23:11:40 +11003732 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10003733
3734 /* Obtain a connection to the real X display. */
3735 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003736 if (sock != -1) {
3737 /* Allocate a channel for this connection. */
3738 c = channel_new("connected x11 socket",
3739 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3740 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11003741 c->remote_id = remote_id;
3742 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003743 }
Darren Tuckera627d422013-06-02 07:31:17 +10003744 free(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003745 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10003746 /* Send refusal to the remote host. */
3747 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003748 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10003749 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10003750 /* Send a confirmation to the remote host. */
3751 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003752 packet_put_int(remote_id);
3753 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10003754 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003755 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003756}
3757
Damien Miller69b69aa2000-10-28 14:19:58 +11003758/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
Damien Miller8473dd82006-07-24 14:08:32 +10003759/* ARGSUSED */
Damien Miller69b69aa2000-10-28 14:19:58 +11003760void
Damien Miller630d6f42002-01-22 23:17:30 +11003761deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11003762{
3763 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00003764
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00003765 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11003766 case SSH_SMSG_AGENT_OPEN:
3767 error("Warning: ssh server tried agent forwarding.");
3768 break;
3769 case SSH_SMSG_X11_OPEN:
3770 error("Warning: ssh server tried X11 forwarding.");
3771 break;
3772 default:
Damien Miller630d6f42002-01-22 23:17:30 +11003773 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11003774 break;
3775 }
Damien Miller5eb137c2005-12-31 16:19:53 +11003776 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11003777 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3778 packet_put_int(rchan);
3779 packet_send();
3780}
3781
Damien Miller5428f641999-11-25 11:54:57 +11003782/*
3783 * Requests forwarding of X11 connections, generates fake authentication
3784 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00003785 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11003786 */
Damien Miller4af51302000-04-16 11:18:38 +10003787void
Damien Miller17e7ed02005-06-17 12:54:33 +10003788x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Miller6d7b4372011-06-23 08:31:57 +10003789 const char *proto, const char *data, int want_reply)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003790{
Ben Lindstrom46c16222000-12-22 01:43:59 +00003791 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10003792 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11003793 char *new_data;
3794 int screen_number;
3795 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10003796 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003797
Damien Millerf92c0792005-07-06 09:45:26 +10003798 if (x11_saved_display == NULL)
3799 x11_saved_display = xstrdup(disp);
3800 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10003801 error("x11_request_forwarding_with_spoofing: different "
3802 "$DISPLAY already forwarded");
3803 return;
3804 }
3805
Damien Millerd5fe0ba2006-08-30 11:07:39 +10003806 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11003807 if (cp)
3808 cp = strchr(cp, '.');
3809 if (cp)
Damien Miller08d61502006-03-26 14:28:32 +11003810 screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
Damien Miller95def091999-11-25 00:26:21 +11003811 else
3812 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003813
Damien Miller13390022005-07-06 09:44:19 +10003814 if (x11_saved_proto == NULL) {
3815 /* Save protocol name. */
3816 x11_saved_proto = xstrdup(proto);
3817 /*
Damien Miller46d38de2005-07-17 17:02:09 +10003818 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10003819 * of the same length.
3820 */
3821 x11_saved_data = xmalloc(data_len);
3822 x11_fake_data = xmalloc(data_len);
3823 for (i = 0; i < data_len; i++) {
3824 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3825 fatal("x11_request_forwarding: bad "
3826 "authentication data: %.100s", data);
3827 if (i % 4 == 0)
3828 rnd = arc4random();
3829 x11_saved_data[i] = value;
3830 x11_fake_data[i] = rnd & 0xff;
3831 rnd >>= 8;
3832 }
3833 x11_saved_data_len = data_len;
3834 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003835 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003836
Damien Miller95def091999-11-25 00:26:21 +11003837 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003838 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003839
Damien Miller95def091999-11-25 00:26:21 +11003840 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003841 if (compat20) {
Damien Miller6d7b4372011-06-23 08:31:57 +10003842 channel_request_start(client_session_id, "x11-req", want_reply);
Damien Millerbd483e72000-04-30 10:00:53 +10003843 packet_put_char(0); /* XXX bool single connection */
3844 } else {
3845 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3846 }
3847 packet_put_cstring(proto);
3848 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003849 packet_put_int(screen_number);
3850 packet_send();
3851 packet_write_wait();
Darren Tuckera627d422013-06-02 07:31:17 +10003852 free(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003853}
3854
Ben Lindstrome9c99912001-06-09 00:41:05 +00003855
3856/* -- agent forwarding */
3857
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003858/* Sends a message to the server to request authentication fd forwarding. */
3859
Damien Miller4af51302000-04-16 11:18:38 +10003860void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003861auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003862{
Damien Miller95def091999-11-25 00:26:21 +11003863 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3864 packet_send();
3865 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003866}