blob: 1020071ff17a2ecfc1d6c2502f3ea458c77ffe2c [file] [log] [blame]
Damien Miller633de332014-05-15 13:48:26 +10001/* $OpenBSD: channels.c,v 1.332 2014/04/28 03:09:18 djm 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'. */
113 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000114} ForwardPermission;
115
Damien Miller9b439df2006-07-24 14:04:00 +1000116/* List of all permitted host/port pairs to connect by the user. */
Damien Miller232cfb12010-06-26 09:50:30 +1000117static ForwardPermission *permitted_opens = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000118
Damien Miller9b439df2006-07-24 14:04:00 +1000119/* List of all permitted host/port pairs to connect by the admin. */
Damien Miller232cfb12010-06-26 09:50:30 +1000120static ForwardPermission *permitted_adm_opens = NULL;
Damien Miller9b439df2006-07-24 14:04:00 +1000121
122/* Number of permitted host/port pairs in the array permitted by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000123static int num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +1000124
125/* Number of permitted host/port pair in the array permitted by the admin. */
126static int num_adm_permitted_opens = 0;
127
Darren Tucker1338b9e2011-10-02 18:57:35 +1100128/* special-case port number meaning allow any port */
129#define FWD_PERMIT_ANY_PORT 0
130
Damien Miller5428f641999-11-25 11:54:57 +1100131/*
132 * If this is true, all opens are permitted. This is the case on the server
133 * on which we have to trust the client anyway, and the user could do
134 * anything after logging in anyway.
135 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000136static int all_opens_permitted = 0;
137
Ben Lindstrome9c99912001-06-09 00:41:05 +0000138
139/* -- X11 forwarding */
140
141/* Maximum number of fake X11 displays to try. */
142#define MAX_DISPLAYS 1000
143
Damien Miller13390022005-07-06 09:44:19 +1000144/* Saved X11 local (client) display. */
145static char *x11_saved_display = NULL;
146
Ben Lindstrome9c99912001-06-09 00:41:05 +0000147/* Saved X11 authentication protocol name. */
148static char *x11_saved_proto = NULL;
149
150/* Saved X11 authentication data. This is the real data. */
151static char *x11_saved_data = NULL;
152static u_int x11_saved_data_len = 0;
153
154/*
155 * Fake X11 authentication data. This is what the server will be sending us;
156 * we should replace any occurrences of this by the real data.
157 */
Damien Miller4ae97f12006-03-26 14:08:10 +1100158static u_char *x11_fake_data = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000159static u_int x11_fake_data_len;
160
161
162/* -- agent forwarding */
163
164#define NUM_SOCKS 10
165
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000166/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000167static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000168
Ben Lindstrome9c99912001-06-09 00:41:05 +0000169/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000170static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000171
Damien Millerbd740252008-05-19 15:37:09 +1000172/* non-blocking connect helpers */
173static int connect_next(struct channel_connect *);
174static void channel_connect_ctx_free(struct channel_connect *);
175
Ben Lindstrome9c99912001-06-09 00:41:05 +0000176/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000177
178Channel *
Damien Millerd47c62a2005-12-13 19:33:57 +1100179channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000180{
181 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000182
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000183 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100184 logit("channel_by_id: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000185 return NULL;
186 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000187 c = channels[id];
188 if (c == NULL) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100189 logit("channel_by_id: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000190 return NULL;
191 }
192 return c;
193}
194
Damien Miller5428f641999-11-25 11:54:57 +1100195/*
Damien Millerd47c62a2005-12-13 19:33:57 +1100196 * Returns the channel if it is allowed to receive protocol messages.
197 * Private channels, like listening sockets, may not receive messages.
198 */
199Channel *
200channel_lookup(int id)
201{
202 Channel *c;
203
204 if ((c = channel_by_id(id)) == NULL)
205 return (NULL);
206
Damien Millerd62f2ca2006-03-26 13:57:41 +1100207 switch (c->type) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100208 case SSH_CHANNEL_X11_OPEN:
209 case SSH_CHANNEL_LARVAL:
210 case SSH_CHANNEL_CONNECTING:
211 case SSH_CHANNEL_DYNAMIC:
212 case SSH_CHANNEL_OPENING:
213 case SSH_CHANNEL_OPEN:
214 case SSH_CHANNEL_INPUT_DRAINING:
215 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller36187092013-06-10 13:07:11 +1000216 case SSH_CHANNEL_ABANDONED:
Damien Millerd47c62a2005-12-13 19:33:57 +1100217 return (c);
Damien Millerd47c62a2005-12-13 19:33:57 +1100218 }
219 logit("Non-public channel %d, type %d.", id, c->type);
220 return (NULL);
221}
222
223/*
Damien Millere247cc42000-05-07 12:03:14 +1000224 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000225 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100226 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000227static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100228channel_register_fds(Channel *c, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000229 int extusage, int nonblock, int is_tty)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000230{
Damien Miller95def091999-11-25 00:26:21 +1100231 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100232 channel_max_fd = MAX(channel_max_fd, rfd);
233 channel_max_fd = MAX(channel_max_fd, wfd);
234 channel_max_fd = MAX(channel_max_fd, efd);
235
Darren Tucker6e7fe1c2010-01-08 17:07:22 +1100236 if (rfd != -1)
237 fcntl(rfd, F_SETFD, FD_CLOEXEC);
238 if (wfd != -1 && wfd != rfd)
239 fcntl(wfd, F_SETFD, FD_CLOEXEC);
240 if (efd != -1 && efd != rfd && efd != wfd)
241 fcntl(efd, F_SETFD, FD_CLOEXEC);
Damien Millere247cc42000-05-07 12:03:14 +1000242
Damien Miller6f83b8e2000-05-02 09:23:45 +1000243 c->rfd = rfd;
244 c->wfd = wfd;
245 c->sock = (rfd == wfd) ? rfd : -1;
246 c->efd = efd;
247 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100248
Darren Tuckered3cdc02008-06-16 23:29:18 +1000249 if ((c->isatty = is_tty) != 0)
Damien Millerfbdeece2003-09-02 22:52:31 +1000250 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Millerc192a4c2013-08-01 14:29:20 +1000251#ifdef _AIX
252 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker1a48aec2008-06-16 23:35:56 +1000253 c->wfd_isatty = is_tty || isatty(c->wfd);
Damien Millerc192a4c2013-08-01 14:29:20 +1000254#endif
Damien Miller79438cc2001-02-16 12:34:57 +1100255
Damien Miller69b69aa2000-10-28 14:19:58 +1100256 /* enable nonblocking mode */
257 if (nonblock) {
258 if (rfd != -1)
259 set_nonblock(rfd);
260 if (wfd != -1)
261 set_nonblock(wfd);
262 if (efd != -1)
263 set_nonblock(efd);
264 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000265}
266
267/*
268 * Allocate a new channel object and set its type and socket. This will cause
269 * remote_name to be freed.
270 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000271Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000272channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000273 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000274{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000275 int found;
276 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000277 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000278
Damien Miller95def091999-11-25 00:26:21 +1100279 /* Do initial allocation if this is the first call. */
280 if (channels_alloc == 0) {
281 channels_alloc = 10;
Damien Miller07d86be2006-03-26 14:19:21 +1100282 channels = xcalloc(channels_alloc, sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100283 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000284 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100285 }
286 /* Try to find a free slot where to put the new channel. */
287 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000288 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100289 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000290 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100291 break;
292 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000293 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100294 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100295 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000296 if (channels_alloc > 10000)
297 fatal("channel_new: internal error: channels_alloc %d "
298 "too big.", channels_alloc);
Damien Miller36812092006-03-26 14:22:47 +1100299 channels = xrealloc(channels, channels_alloc + 10,
300 sizeof(Channel *));
Damien Miller5efcecc2003-09-17 07:31:14 +1000301 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100302 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100303 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000304 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100305 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000306 /* Initialize and return new channel. */
Damien Miller07d86be2006-03-26 14:19:21 +1100307 c = channels[found] = xcalloc(1, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100308 buffer_init(&c->input);
309 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000310 buffer_init(&c->extended);
Damien Millera1c1b6c2009-01-28 16:29:49 +1100311 c->path = NULL;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000312 c->listening_addr = NULL;
313 c->listening_port = 0;
Damien Miller5144df92002-01-22 23:28:45 +1100314 c->ostate = CHAN_OUTPUT_OPEN;
315 c->istate = CHAN_INPUT_OPEN;
316 c->flags = 0;
Damien Millerd310d512008-06-16 07:59:23 +1000317 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0);
Damien Millera6508752012-04-22 11:21:10 +1000318 c->notbefore = 0;
Damien Miller95def091999-11-25 00:26:21 +1100319 c->self = found;
320 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000321 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000322 c->local_window = window;
323 c->local_window_max = window;
324 c->local_consumed = 0;
325 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100326 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000327 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000328 c->remote_window = 0;
329 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000330 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100331 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000332 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100333 c->detach_close = 0;
Damien Millerb84886b2008-05-19 15:05:07 +1000334 c->open_confirm = NULL;
335 c->open_confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000336 c->input_filter = NULL;
Damien Miller077b2382005-12-31 16:22:32 +1100337 c->output_filter = NULL;
Darren Tucker84c56f52008-06-13 04:55:46 +1000338 c->filter_ctx = NULL;
339 c->filter_cleanup = NULL;
Damien Millere1537f92010-01-26 13:26:22 +1100340 c->ctl_chan = -1;
341 c->mux_rcb = NULL;
342 c->mux_ctx = NULL;
Damien Millerd530f5f2010-05-21 14:57:10 +1000343 c->mux_pause = 0;
Darren Tucker876045b2010-01-08 17:08:00 +1100344 c->delayed = 1; /* prevent call to channel_post handler */
Damien Millerb84886b2008-05-19 15:05:07 +1000345 TAILQ_INIT(&c->status_confirms);
Damien Miller95def091999-11-25 00:26:21 +1100346 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000347 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000348}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000349
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000350static int
351channel_find_maxfd(void)
352{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000353 u_int i;
354 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000355 Channel *c;
356
357 for (i = 0; i < channels_alloc; i++) {
358 c = channels[i];
359 if (c != NULL) {
360 max = MAX(max, c->rfd);
361 max = MAX(max, c->wfd);
362 max = MAX(max, c->efd);
363 }
364 }
365 return max;
366}
367
368int
369channel_close_fd(int *fdp)
370{
371 int ret = 0, fd = *fdp;
372
373 if (fd != -1) {
374 ret = close(fd);
375 *fdp = -1;
376 if (fd == channel_max_fd)
377 channel_max_fd = channel_find_maxfd();
378 }
379 return ret;
380}
381
Damien Miller6f83b8e2000-05-02 09:23:45 +1000382/* Close all channel fd/socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000383static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000384channel_close_fds(Channel *c)
385{
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000386 channel_close_fd(&c->sock);
387 channel_close_fd(&c->rfd);
388 channel_close_fd(&c->wfd);
389 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000390}
391
392/* Free the channel and close its fd/socket. */
Damien Miller4af51302000-04-16 11:18:38 +1000393void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000394channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000395{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000396 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000397 u_int i, n;
Damien Millerb84886b2008-05-19 15:05:07 +1000398 struct channel_confirm *cc;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000399
400 for (n = 0, i = 0; i < channels_alloc; i++)
401 if (channels[i])
402 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000403 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000404 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000405
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000406 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000407 debug3("channel %d: status: %s", c->self, s);
Darren Tuckera627d422013-06-02 07:31:17 +1000408 free(s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000409
Damien Miller6f83b8e2000-05-02 09:23:45 +1000410 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000411 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000412 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000413 buffer_free(&c->input);
414 buffer_free(&c->output);
415 buffer_free(&c->extended);
Darren Tuckera627d422013-06-02 07:31:17 +1000416 free(c->remote_name);
417 c->remote_name = NULL;
418 free(c->path);
419 c->path = NULL;
420 free(c->listening_addr);
421 c->listening_addr = NULL;
Damien Millerb84886b2008-05-19 15:05:07 +1000422 while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
423 if (cc->abandon_cb != NULL)
424 cc->abandon_cb(c, cc->ctx);
425 TAILQ_REMOVE(&c->status_confirms, cc, entry);
Damien Miller1d2c4562014-02-04 11:18:20 +1100426 explicit_bzero(cc, sizeof(*cc));
Darren Tuckera627d422013-06-02 07:31:17 +1000427 free(cc);
Damien Millerb84886b2008-05-19 15:05:07 +1000428 }
Darren Tucker84c56f52008-06-13 04:55:46 +1000429 if (c->filter_cleanup != NULL && c->filter_ctx != NULL)
430 c->filter_cleanup(c->self, c->filter_ctx);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000431 channels[c->self] = NULL;
Darren Tuckera627d422013-06-02 07:31:17 +1000432 free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000433}
434
Ben Lindstrome9c99912001-06-09 00:41:05 +0000435void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000436channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000437{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000438 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000439
Ben Lindstrom601e4362001-06-21 03:19:23 +0000440 for (i = 0; i < channels_alloc; i++)
441 if (channels[i] != NULL)
442 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000443}
444
445/*
446 * Closes the sockets/fds of all channels. This is used to close extra file
447 * descriptors after a fork.
448 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000449void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000450channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000451{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000452 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000453
454 for (i = 0; i < channels_alloc; i++)
455 if (channels[i] != NULL)
456 channel_close_fds(channels[i]);
457}
458
459/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000460 * Stop listening to channels.
461 */
Ben Lindstrom809744e2001-07-04 05:26:06 +0000462void
463channel_stop_listening(void)
464{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000465 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000466 Channel *c;
467
468 for (i = 0; i < channels_alloc; i++) {
469 c = channels[i];
470 if (c != NULL) {
471 switch (c->type) {
472 case SSH_CHANNEL_AUTH_SOCKET:
473 case SSH_CHANNEL_PORT_LISTENER:
474 case SSH_CHANNEL_RPORT_LISTENER:
475 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000476 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000477 channel_free(c);
478 break;
479 }
480 }
481 }
482}
483
484/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000485 * Returns true if no channel has too much buffered data, and false if one or
486 * more channel is overfull.
487 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000488int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000489channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000490{
491 u_int i;
492 Channel *c;
493
494 for (i = 0; i < channels_alloc; i++) {
495 c = channels[i];
496 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000497#if 0
498 if (!compat20 &&
499 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100500 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000501 c->self, buffer_len(&c->input));
502 return 0;
503 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000504#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000505 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000506 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000507 c->self, buffer_len(&c->output),
508 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000509 return 0;
510 }
511 }
512 }
513 return 1;
514}
515
516/* Returns true if any channel is still open. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000517int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000518channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000519{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000520 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000521 Channel *c;
522
523 for (i = 0; i < channels_alloc; i++) {
524 c = channels[i];
525 if (c == NULL)
526 continue;
527 switch (c->type) {
528 case SSH_CHANNEL_X11_LISTENER:
529 case SSH_CHANNEL_PORT_LISTENER:
530 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100531 case SSH_CHANNEL_MUX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000532 case SSH_CHANNEL_CLOSED:
533 case SSH_CHANNEL_AUTH_SOCKET:
534 case SSH_CHANNEL_DYNAMIC:
535 case SSH_CHANNEL_CONNECTING:
536 case SSH_CHANNEL_ZOMBIE:
Damien Miller36187092013-06-10 13:07:11 +1000537 case SSH_CHANNEL_ABANDONED:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000538 continue;
539 case SSH_CHANNEL_LARVAL:
540 if (!compat20)
541 fatal("cannot happen: SSH_CHANNEL_LARVAL");
542 continue;
543 case SSH_CHANNEL_OPENING:
544 case SSH_CHANNEL_OPEN:
545 case SSH_CHANNEL_X11_OPEN:
Damien Millere1537f92010-01-26 13:26:22 +1100546 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000547 return 1;
548 case SSH_CHANNEL_INPUT_DRAINING:
549 case SSH_CHANNEL_OUTPUT_DRAINING:
550 if (!compat13)
551 fatal("cannot happen: OUT_DRAIN");
552 return 1;
553 default:
554 fatal("channel_still_open: bad channel type %d", c->type);
555 /* NOTREACHED */
556 }
557 }
558 return 0;
559}
560
561/* Returns the id of an open channel suitable for keepaliving */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000562int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000563channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000564{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000565 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000566 Channel *c;
567
568 for (i = 0; i < channels_alloc; i++) {
569 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000570 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000571 continue;
572 switch (c->type) {
573 case SSH_CHANNEL_CLOSED:
574 case SSH_CHANNEL_DYNAMIC:
575 case SSH_CHANNEL_X11_LISTENER:
576 case SSH_CHANNEL_PORT_LISTENER:
577 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100578 case SSH_CHANNEL_MUX_LISTENER:
579 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000580 case SSH_CHANNEL_OPENING:
581 case SSH_CHANNEL_CONNECTING:
582 case SSH_CHANNEL_ZOMBIE:
Damien Miller36187092013-06-10 13:07:11 +1000583 case SSH_CHANNEL_ABANDONED:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000584 continue;
585 case SSH_CHANNEL_LARVAL:
586 case SSH_CHANNEL_AUTH_SOCKET:
587 case SSH_CHANNEL_OPEN:
588 case SSH_CHANNEL_X11_OPEN:
589 return i;
590 case SSH_CHANNEL_INPUT_DRAINING:
591 case SSH_CHANNEL_OUTPUT_DRAINING:
592 if (!compat13)
593 fatal("cannot happen: OUT_DRAIN");
594 return i;
595 default:
596 fatal("channel_find_open: bad channel type %d", c->type);
597 /* NOTREACHED */
598 }
599 }
600 return -1;
601}
602
603
604/*
605 * Returns a message describing the currently open forwarded connections,
606 * suitable for sending to the client. The message contains crlf pairs for
607 * newlines.
608 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000609char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000610channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000611{
612 Buffer buffer;
613 Channel *c;
614 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000615 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000616
617 buffer_init(&buffer);
618 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
619 buffer_append(&buffer, buf, strlen(buf));
620 for (i = 0; i < channels_alloc; i++) {
621 c = channels[i];
622 if (c == NULL)
623 continue;
624 switch (c->type) {
625 case SSH_CHANNEL_X11_LISTENER:
626 case SSH_CHANNEL_PORT_LISTENER:
627 case SSH_CHANNEL_RPORT_LISTENER:
628 case SSH_CHANNEL_CLOSED:
629 case SSH_CHANNEL_AUTH_SOCKET:
630 case SSH_CHANNEL_ZOMBIE:
Damien Miller36187092013-06-10 13:07:11 +1000631 case SSH_CHANNEL_ABANDONED:
Damien Millere1537f92010-01-26 13:26:22 +1100632 case SSH_CHANNEL_MUX_CLIENT:
633 case SSH_CHANNEL_MUX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000634 continue;
635 case SSH_CHANNEL_LARVAL:
636 case SSH_CHANNEL_OPENING:
637 case SSH_CHANNEL_CONNECTING:
638 case SSH_CHANNEL_DYNAMIC:
639 case SSH_CHANNEL_OPEN:
640 case SSH_CHANNEL_X11_OPEN:
641 case SSH_CHANNEL_INPUT_DRAINING:
642 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000643 snprintf(buf, sizeof buf,
Damien Millere1537f92010-01-26 13:26:22 +1100644 " #%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 +0000645 c->self, c->remote_name,
646 c->type, c->remote_id,
647 c->istate, buffer_len(&c->input),
648 c->ostate, buffer_len(&c->output),
Damien Millere1537f92010-01-26 13:26:22 +1100649 c->rfd, c->wfd, c->ctl_chan);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000650 buffer_append(&buffer, buf, strlen(buf));
651 continue;
652 default:
653 fatal("channel_open_message: bad channel type %d", c->type);
654 /* NOTREACHED */
655 }
656 }
657 buffer_append(&buffer, "\0", 1);
658 cp = xstrdup(buffer_ptr(&buffer));
659 buffer_free(&buffer);
660 return cp;
661}
662
663void
664channel_send_open(int id)
665{
666 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000667
Ben Lindstrome9c99912001-06-09 00:41:05 +0000668 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000669 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000670 return;
671 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000672 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000673 packet_start(SSH2_MSG_CHANNEL_OPEN);
674 packet_put_cstring(c->ctype);
675 packet_put_int(c->self);
676 packet_put_int(c->local_window);
677 packet_put_int(c->local_maxpacket);
678 packet_send();
679}
680
681void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000682channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000683{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000684 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000685
Ben Lindstrome9c99912001-06-09 00:41:05 +0000686 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000687 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000688 return;
689 }
Damien Miller0e220db2004-06-15 10:34:08 +1000690 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000691 packet_start(SSH2_MSG_CHANNEL_REQUEST);
692 packet_put_int(c->remote_id);
693 packet_put_cstring(service);
694 packet_put_char(wantconfirm);
695}
Damien Miller4f7becb2006-03-26 14:10:14 +1100696
Ben Lindstrome9c99912001-06-09 00:41:05 +0000697void
Damien Millerb84886b2008-05-19 15:05:07 +1000698channel_register_status_confirm(int id, channel_confirm_cb *cb,
699 channel_confirm_abandon_cb *abandon_cb, void *ctx)
700{
701 struct channel_confirm *cc;
702 Channel *c;
703
704 if ((c = channel_lookup(id)) == NULL)
705 fatal("channel_register_expect: %d: bad id", id);
706
Damien Miller6c81fee2013-11-08 12:19:55 +1100707 cc = xcalloc(1, sizeof(*cc));
Damien Millerb84886b2008-05-19 15:05:07 +1000708 cc->cb = cb;
709 cc->abandon_cb = abandon_cb;
710 cc->ctx = ctx;
711 TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry);
712}
713
714void
Damien Millerd530f5f2010-05-21 14:57:10 +1000715channel_register_open_confirm(int id, channel_open_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000716{
717 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000718
Ben Lindstrome9c99912001-06-09 00:41:05 +0000719 if (c == NULL) {
Damien Millera0094332008-11-03 19:26:35 +1100720 logit("channel_register_open_confirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000721 return;
722 }
Damien Millerb84886b2008-05-19 15:05:07 +1000723 c->open_confirm = fn;
724 c->open_confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000725}
Damien Miller4f7becb2006-03-26 14:10:14 +1100726
Ben Lindstrome9c99912001-06-09 00:41:05 +0000727void
Damien Miller39eda6e2005-11-05 14:52:50 +1100728channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000729{
Damien Millerd47c62a2005-12-13 19:33:57 +1100730 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000731
Ben Lindstrome9c99912001-06-09 00:41:05 +0000732 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000733 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000734 return;
735 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000736 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100737 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000738}
Damien Miller4f7becb2006-03-26 14:10:14 +1100739
Ben Lindstrome9c99912001-06-09 00:41:05 +0000740void
741channel_cancel_cleanup(int id)
742{
Damien Millerd47c62a2005-12-13 19:33:57 +1100743 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000744
Ben Lindstrome9c99912001-06-09 00:41:05 +0000745 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000746 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000747 return;
748 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000749 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100750 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000751}
Damien Miller4f7becb2006-03-26 14:10:14 +1100752
Ben Lindstrome9c99912001-06-09 00:41:05 +0000753void
Damien Miller077b2382005-12-31 16:22:32 +1100754channel_register_filter(int id, channel_infilter_fn *ifn,
Darren Tucker84c56f52008-06-13 04:55:46 +1000755 channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000756{
757 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000758
Ben Lindstrome9c99912001-06-09 00:41:05 +0000759 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000760 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000761 return;
762 }
Damien Miller077b2382005-12-31 16:22:32 +1100763 c->input_filter = ifn;
764 c->output_filter = ofn;
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000765 c->filter_ctx = ctx;
Darren Tucker84c56f52008-06-13 04:55:46 +1000766 c->filter_cleanup = cfn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000767}
768
769void
770channel_set_fds(int id, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000771 int extusage, int nonblock, int is_tty, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000772{
773 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000774
Ben Lindstrome9c99912001-06-09 00:41:05 +0000775 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
776 fatal("channel_activate for non-larval channel %d.", id);
Darren Tuckered3cdc02008-06-16 23:29:18 +1000777 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000778 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100779 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000780 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
781 packet_put_int(c->remote_id);
782 packet_put_int(c->local_window);
783 packet_send();
784}
785
Damien Miller5428f641999-11-25 11:54:57 +1100786/*
Damien Millerb38eff82000-04-01 11:09:21 +1000787 * 'channel_pre*' are called just before select() to add any bits relevant to
788 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100789 */
Damien Millerb38eff82000-04-01 11:09:21 +1000790/*
791 * 'channel_post*': perform any appropriate operations for channels which
792 * have events pending.
793 */
Damien Millerd62f2ca2006-03-26 13:57:41 +1100794typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000795chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
796chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
797
Damien Miller8473dd82006-07-24 14:08:32 +1000798/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000799static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100800channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000801{
802 FD_SET(c->sock, readset);
803}
804
Damien Miller8473dd82006-07-24 14:08:32 +1000805/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000806static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100807channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000808{
809 debug3("channel %d: waiting for connection", c->self);
810 FD_SET(c->sock, writeset);
811}
812
Ben Lindstrombba81212001-06-25 05:01:22 +0000813static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100814channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000815{
816 if (buffer_len(&c->input) < packet_get_maxsize())
817 FD_SET(c->sock, readset);
818 if (buffer_len(&c->output) > 0)
819 FD_SET(c->sock, writeset);
820}
821
Ben Lindstrombba81212001-06-25 05:01:22 +0000822static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100823channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000824{
Damien Millerde6987c2002-01-22 23:20:40 +1100825 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000826
Damien Miller33b13562000-04-04 14:38:59 +1000827 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100828 limit > 0 &&
Damien Miller499a0d52006-04-23 12:06:03 +1000829 buffer_len(&c->input) < limit &&
830 buffer_check_alloc(&c->input, CHAN_RBUF))
Damien Miller33b13562000-04-04 14:38:59 +1000831 FD_SET(c->rfd, readset);
832 if (c->ostate == CHAN_OUTPUT_OPEN ||
833 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
834 if (buffer_len(&c->output) > 0) {
835 FD_SET(c->wfd, writeset);
836 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000837 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000838 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
839 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000840 else
841 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000842 }
843 }
844 /** XXX check close conditions, too */
Damien Millerd654dd22008-05-19 16:05:41 +1000845 if (compat20 && c->efd != -1 &&
846 !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) {
Damien Miller33b13562000-04-04 14:38:59 +1000847 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
848 buffer_len(&c->extended) > 0)
849 FD_SET(c->efd, writeset);
Damien Miller8853ca52010-06-26 10:00:14 +1000850 else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT) &&
851 (c->extended_usage == CHAN_EXTENDED_READ ||
852 c->extended_usage == CHAN_EXTENDED_IGNORE) &&
Damien Miller33b13562000-04-04 14:38:59 +1000853 buffer_len(&c->extended) < c->remote_window)
854 FD_SET(c->efd, readset);
855 }
Damien Miller0e220db2004-06-15 10:34:08 +1000856 /* XXX: What about efd? races? */
Damien Miller33b13562000-04-04 14:38:59 +1000857}
858
Damien Miller8473dd82006-07-24 14:08:32 +1000859/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000860static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100861channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000862{
863 if (buffer_len(&c->input) == 0) {
864 packet_start(SSH_MSG_CHANNEL_CLOSE);
865 packet_put_int(c->remote_id);
866 packet_send();
867 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000868 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000869 }
870}
871
Damien Miller8473dd82006-07-24 14:08:32 +1000872/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000873static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100874channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000875{
876 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000877 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000878 else
Damien Millerb38eff82000-04-01 11:09:21 +1000879 FD_SET(c->sock, writeset);
880}
881
882/*
883 * This is a special state for X11 authentication spoofing. An opened X11
884 * connection (when authentication spoofing is being done) remains in this
885 * state until the first packet has been completely read. The authentication
886 * data in that packet is then substituted by the real data if it matches the
887 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000888 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000889 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000890 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000891static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000892x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000893{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000894 u_char *ucp;
895 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000896
897 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000898 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000899 return 0;
900
901 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100902 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000903 if (ucp[0] == 0x42) { /* Byte order MSB first. */
904 proto_len = 256 * ucp[6] + ucp[7];
905 data_len = 256 * ucp[8] + ucp[9];
906 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
907 proto_len = ucp[6] + 256 * ucp[7];
908 data_len = ucp[8] + 256 * ucp[9];
909 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000910 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100911 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000912 return -1;
913 }
914
915 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000916 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000917 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
918 return 0;
919
920 /* Check if authentication protocol matches. */
921 if (proto_len != strlen(x11_saved_proto) ||
922 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000923 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000924 return -1;
925 }
926 /* Check if authentication data matches our fake data. */
927 if (data_len != x11_fake_data_len ||
Damien Millerea1651c2010-07-16 13:58:37 +1000928 timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3),
Damien Millerb38eff82000-04-01 11:09:21 +1000929 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000930 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000931 return -1;
932 }
933 /* Check fake data length */
934 if (x11_fake_data_len != x11_saved_data_len) {
935 error("X11 fake_data_len %d != saved_data_len %d",
936 x11_fake_data_len, x11_saved_data_len);
937 return -1;
938 }
939 /*
940 * Received authentication protocol and data match
941 * our fake data. Substitute the fake data with real
942 * data.
943 */
944 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
945 x11_saved_data, x11_saved_data_len);
946 return 1;
947}
948
Ben Lindstrombba81212001-06-25 05:01:22 +0000949static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100950channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000951{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000952 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000953
Damien Millerb38eff82000-04-01 11:09:21 +1000954 if (ret == 1) {
955 /* Start normal processing for the channel. */
956 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000957 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000958 } else if (ret == -1) {
959 /*
960 * We have received an X11 connection that has bad
961 * authentication information.
962 */
Damien Miller996acd22003-04-09 20:59:48 +1000963 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000964 buffer_clear(&c->input);
965 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000966 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000967 c->sock = -1;
968 c->type = SSH_CHANNEL_CLOSED;
969 packet_start(SSH_MSG_CHANNEL_CLOSE);
970 packet_put_int(c->remote_id);
971 packet_send();
972 }
973}
974
Ben Lindstrombba81212001-06-25 05:01:22 +0000975static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100976channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000977{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000978 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000979
980 /* c->force_drain = 1; */
981
Damien Millerb38eff82000-04-01 11:09:21 +1000982 if (ret == 1) {
983 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100984 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000985 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000986 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000987 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100988 chan_read_failed(c);
989 buffer_clear(&c->input);
990 chan_ibuf_empty(c);
991 buffer_clear(&c->output);
992 /* for proto v1, the peer will send an IEOF */
993 if (compat20)
994 chan_write_failed(c);
995 else
996 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000997 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000998 }
999}
1000
Damien Millere1537f92010-01-26 13:26:22 +11001001static void
1002channel_pre_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
1003{
Damien Millerd530f5f2010-05-21 14:57:10 +10001004 if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause &&
Damien Millere1537f92010-01-26 13:26:22 +11001005 buffer_check_alloc(&c->input, CHAN_RBUF))
1006 FD_SET(c->rfd, readset);
1007 if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1008 /* clear buffer immediately (discard any partial packet) */
1009 buffer_clear(&c->input);
1010 chan_ibuf_empty(c);
1011 /* Start output drain. XXX just kill chan? */
1012 chan_rcvd_oclose(c);
1013 }
1014 if (c->ostate == CHAN_OUTPUT_OPEN ||
1015 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1016 if (buffer_len(&c->output) > 0)
1017 FD_SET(c->wfd, writeset);
1018 else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN)
1019 chan_obuf_empty(c);
1020 }
1021}
1022
Ben Lindstromb3921512001-04-11 15:57:50 +00001023/* try to decode a socks4 header */
Damien Miller8473dd82006-07-24 14:08:32 +10001024/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001025static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001026channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001027{
Damien Millera10f5612002-09-12 09:49:15 +10001028 char *p, *host;
Damien Miller1781f532009-01-28 16:24:41 +11001029 u_int len, have, i, found, need;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001030 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001031 struct {
1032 u_int8_t version;
1033 u_int8_t command;
1034 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +00001035 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001036 } s4_req, s4_rsp;
1037
Ben Lindstromb3921512001-04-11 15:57:50 +00001038 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001039
1040 have = buffer_len(&c->input);
1041 len = sizeof(s4_req);
1042 if (have < len)
1043 return 0;
1044 p = buffer_ptr(&c->input);
Damien Miller1781f532009-01-28 16:24:41 +11001045
1046 need = 1;
1047 /* SOCKS4A uses an invalid IP address 0.0.0.x */
1048 if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) {
1049 debug2("channel %d: socks4a request", c->self);
1050 /* ... and needs an extra string (the hostname) */
1051 need = 2;
1052 }
1053 /* Check for terminating NUL on the string(s) */
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001054 for (found = 0, i = len; i < have; i++) {
1055 if (p[i] == '\0') {
Damien Miller1781f532009-01-28 16:24:41 +11001056 found++;
1057 if (found == need)
1058 break;
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001059 }
1060 if (i > 1024) {
1061 /* the peer is probably sending garbage */
1062 debug("channel %d: decode socks4: too long",
1063 c->self);
1064 return -1;
1065 }
1066 }
Damien Miller1781f532009-01-28 16:24:41 +11001067 if (found < need)
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001068 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001069 buffer_get(&c->input, (char *)&s4_req.version, 1);
1070 buffer_get(&c->input, (char *)&s4_req.command, 1);
1071 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +00001072 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001073 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001074 p = buffer_ptr(&c->input);
Damien Miller13481292014-02-27 10:18:32 +11001075 if (memchr(p, '\0', have) == NULL)
1076 fatal("channel %d: decode socks4: user not nul terminated",
1077 c->self);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001078 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001079 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Damien Miller1781f532009-01-28 16:24:41 +11001080 len++; /* trailing '\0' */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001081 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +00001082 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001083 c->self, len, have);
1084 strlcpy(username, p, sizeof(username));
1085 buffer_consume(&c->input, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001086
Darren Tuckera627d422013-06-02 07:31:17 +10001087 free(c->path);
1088 c->path = NULL;
Damien Miller1781f532009-01-28 16:24:41 +11001089 if (need == 1) { /* SOCKS4: one string */
1090 host = inet_ntoa(s4_req.dest_addr);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001091 c->path = xstrdup(host);
Damien Miller1781f532009-01-28 16:24:41 +11001092 } else { /* SOCKS4A: two strings */
1093 have = buffer_len(&c->input);
1094 p = buffer_ptr(&c->input);
1095 len = strlen(p);
1096 debug2("channel %d: decode socks4a: host %s/%d",
1097 c->self, p, len);
1098 len++; /* trailing '\0' */
1099 if (len > have)
1100 fatal("channel %d: decode socks4a: len %d > have %d",
1101 c->self, len, have);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001102 if (len > NI_MAXHOST) {
Damien Miller1781f532009-01-28 16:24:41 +11001103 error("channel %d: hostname \"%.100s\" too long",
1104 c->self, p);
1105 return -1;
1106 }
Damien Millera1c1b6c2009-01-28 16:29:49 +11001107 c->path = xstrdup(p);
Damien Miller1781f532009-01-28 16:24:41 +11001108 buffer_consume(&c->input, len);
1109 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001110 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001111
Damien Millerfbdeece2003-09-02 22:52:31 +10001112 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Damien Miller1781f532009-01-28 16:24:41 +11001113 c->self, c->path, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001114
Ben Lindstromb3921512001-04-11 15:57:50 +00001115 if (s4_req.command != 1) {
Damien Miller1781f532009-01-28 16:24:41 +11001116 debug("channel %d: cannot handle: %s cn %d",
1117 c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command);
Ben Lindstromb3921512001-04-11 15:57:50 +00001118 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001119 }
Ben Lindstromb3921512001-04-11 15:57:50 +00001120 s4_rsp.version = 0; /* vn: 0 for reply */
1121 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001122 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +00001123 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Damien Millera0fdce92006-03-26 14:28:50 +11001124 buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +00001125 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001126}
1127
Darren Tucker46471c92003-07-03 13:55:19 +10001128/* try to decode a socks5 header */
1129#define SSH_SOCKS5_AUTHDONE 0x1000
1130#define SSH_SOCKS5_NOAUTH 0x00
1131#define SSH_SOCKS5_IPV4 0x01
1132#define SSH_SOCKS5_DOMAIN 0x03
1133#define SSH_SOCKS5_IPV6 0x04
1134#define SSH_SOCKS5_CONNECT 0x01
1135#define SSH_SOCKS5_SUCCESS 0x00
1136
Damien Miller8473dd82006-07-24 14:08:32 +10001137/* ARGSUSED */
Darren Tucker46471c92003-07-03 13:55:19 +10001138static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001139channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
Darren Tucker46471c92003-07-03 13:55:19 +10001140{
1141 struct {
1142 u_int8_t version;
1143 u_int8_t command;
1144 u_int8_t reserved;
1145 u_int8_t atyp;
1146 } s5_req, s5_rsp;
1147 u_int16_t dest_port;
Damien Millerce986542013-07-18 16:12:44 +10001148 char dest_addr[255+1], ntop[INET6_ADDRSTRLEN];
1149 u_char *p;
Damien Miller0f077072006-07-10 22:21:02 +10001150 u_int have, need, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001151
1152 debug2("channel %d: decode socks5", c->self);
1153 p = buffer_ptr(&c->input);
1154 if (p[0] != 0x05)
1155 return -1;
1156 have = buffer_len(&c->input);
1157 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1158 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001159 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001160 return 0;
1161 nmethods = p[1];
1162 if (have < nmethods + 2)
1163 return 0;
1164 /* look for method: "NO AUTHENTICATION REQUIRED" */
Damien Miller80163902007-01-05 16:30:16 +11001165 for (found = 0, i = 2; i < nmethods + 2; i++) {
Damien Miller4dec5d72006-08-05 11:38:40 +10001166 if (p[i] == SSH_SOCKS5_NOAUTH) {
Darren Tucker46471c92003-07-03 13:55:19 +10001167 found = 1;
1168 break;
1169 }
1170 }
1171 if (!found) {
1172 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1173 c->self);
1174 return -1;
1175 }
1176 buffer_consume(&c->input, nmethods + 2);
1177 buffer_put_char(&c->output, 0x05); /* version */
1178 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1179 FD_SET(c->sock, writeset);
1180 c->flags |= SSH_SOCKS5_AUTHDONE;
1181 debug2("channel %d: socks5 auth done", c->self);
1182 return 0; /* need more */
1183 }
1184 debug2("channel %d: socks5 post auth", c->self);
1185 if (have < sizeof(s5_req)+1)
1186 return 0; /* need more */
Damien Millere3b21a52006-03-26 14:29:06 +11001187 memcpy(&s5_req, p, sizeof(s5_req));
Darren Tucker46471c92003-07-03 13:55:19 +10001188 if (s5_req.version != 0x05 ||
1189 s5_req.command != SSH_SOCKS5_CONNECT ||
1190 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001191 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001192 return -1;
1193 }
Darren Tucker47eede72005-03-14 23:08:12 +11001194 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001195 case SSH_SOCKS5_IPV4:
1196 addrlen = 4;
1197 af = AF_INET;
1198 break;
1199 case SSH_SOCKS5_DOMAIN:
1200 addrlen = p[sizeof(s5_req)];
1201 af = -1;
1202 break;
1203 case SSH_SOCKS5_IPV6:
1204 addrlen = 16;
1205 af = AF_INET6;
1206 break;
1207 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001208 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001209 return -1;
1210 }
Damien Miller0f077072006-07-10 22:21:02 +10001211 need = sizeof(s5_req) + addrlen + 2;
1212 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1213 need++;
1214 if (have < need)
Darren Tucker46471c92003-07-03 13:55:19 +10001215 return 0;
1216 buffer_consume(&c->input, sizeof(s5_req));
1217 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1218 buffer_consume(&c->input, 1); /* host string length */
Damien Millerce986542013-07-18 16:12:44 +10001219 buffer_get(&c->input, &dest_addr, addrlen);
Darren Tucker46471c92003-07-03 13:55:19 +10001220 buffer_get(&c->input, (char *)&dest_port, 2);
1221 dest_addr[addrlen] = '\0';
Darren Tuckera627d422013-06-02 07:31:17 +10001222 free(c->path);
1223 c->path = NULL;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001224 if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
Damien Miller9576ac42009-01-28 16:30:33 +11001225 if (addrlen >= NI_MAXHOST) {
Damien Millera1c1b6c2009-01-28 16:29:49 +11001226 error("channel %d: dynamic request: socks5 hostname "
1227 "\"%.100s\" too long", c->self, dest_addr);
1228 return -1;
1229 }
1230 c->path = xstrdup(dest_addr);
1231 } else {
1232 if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL)
1233 return -1;
1234 c->path = xstrdup(ntop);
1235 }
Darren Tucker46471c92003-07-03 13:55:19 +10001236 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001237
Damien Millerfbdeece2003-09-02 22:52:31 +10001238 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001239 c->self, c->path, c->host_port, s5_req.command);
1240
1241 s5_rsp.version = 0x05;
1242 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1243 s5_rsp.reserved = 0; /* ignored */
1244 s5_rsp.atyp = SSH_SOCKS5_IPV4;
Darren Tucker46471c92003-07-03 13:55:19 +10001245 dest_port = 0; /* ignored */
1246
Damien Millera0fdce92006-03-26 14:28:50 +11001247 buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp));
Damien Miller13840e02013-09-14 09:49:43 +10001248 buffer_put_int(&c->output, ntohl(INADDR_ANY)); /* bind address */
Damien Millera0fdce92006-03-26 14:28:50 +11001249 buffer_append(&c->output, &dest_port, sizeof(dest_port));
Darren Tucker46471c92003-07-03 13:55:19 +10001250 return 1;
1251}
1252
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001253Channel *
Damien Millere1537f92010-01-26 13:26:22 +11001254channel_connect_stdio_fwd(const char *host_to_connect, u_short port_to_connect,
1255 int in, int out)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001256{
1257 Channel *c;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001258
1259 debug("channel_connect_stdio_fwd %s:%d", host_to_connect,
1260 port_to_connect);
1261
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001262 c = channel_new("stdio-forward", SSH_CHANNEL_OPENING, in, out,
1263 -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1264 0, "stdio-forward", /*nonblock*/0);
1265
1266 c->path = xstrdup(host_to_connect);
1267 c->host_port = port_to_connect;
1268 c->listening_port = 0;
1269 c->force_drain = 1;
1270
1271 channel_register_fds(c, in, out, -1, 0, 1, 0);
1272 port_open_helper(c, "direct-tcpip");
1273
1274 return c;
1275}
1276
Ben Lindstromb3921512001-04-11 15:57:50 +00001277/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001278static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001279channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstromb3921512001-04-11 15:57:50 +00001280{
1281 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001282 u_int have;
1283 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001284
1285 have = buffer_len(&c->input);
Ben Lindstromb3921512001-04-11 15:57:50 +00001286 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001287 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001288 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001289 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001290 /* need more */
1291 FD_SET(c->sock, readset);
1292 return;
1293 }
1294 /* try to guess the protocol */
1295 p = buffer_ptr(&c->input);
1296 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001297 case 0x04:
1298 ret = channel_decode_socks4(c, readset, writeset);
1299 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001300 case 0x05:
1301 ret = channel_decode_socks5(c, readset, writeset);
1302 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001303 default:
1304 ret = -1;
1305 break;
1306 }
1307 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001308 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001309 } else if (ret == 0) {
1310 debug2("channel %d: pre_dynamic: need more", c->self);
1311 /* need more */
1312 FD_SET(c->sock, readset);
1313 } else {
1314 /* switch to the next state */
1315 c->type = SSH_CHANNEL_OPENING;
1316 port_open_helper(c, "direct-tcpip");
1317 }
1318}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001319
Damien Millerb38eff82000-04-01 11:09:21 +10001320/* This is our fake X11 server socket. */
Damien Miller8473dd82006-07-24 14:08:32 +10001321/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001322static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001323channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001324{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001325 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001326 struct sockaddr_storage addr;
Damien Miller37f1c082013-04-23 15:20:43 +10001327 int newsock, oerrno;
Damien Millerb38eff82000-04-01 11:09:21 +10001328 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001329 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001330 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001331
1332 if (FD_ISSET(c->sock, readset)) {
1333 debug("X11 connection requested.");
1334 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001335 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001336 if (c->single_connection) {
Damien Miller37f1c082013-04-23 15:20:43 +10001337 oerrno = errno;
Damien Millerfbdeece2003-09-02 22:52:31 +10001338 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001339 channel_close_fd(&c->sock);
1340 chan_mark_dead(c);
Damien Miller37f1c082013-04-23 15:20:43 +10001341 errno = oerrno;
Damien Millere7378562001-12-21 14:58:35 +11001342 }
Damien Millerb38eff82000-04-01 11:09:21 +10001343 if (newsock < 0) {
Damien Miller37f1c082013-04-23 15:20:43 +10001344 if (errno != EINTR && errno != EWOULDBLOCK &&
1345 errno != ECONNABORTED)
1346 error("accept: %.100s", strerror(errno));
Damien Millera6508752012-04-22 11:21:10 +10001347 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001348 c->notbefore = monotime() + 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001349 return;
1350 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001351 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001352 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001353 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001354 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001355 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001356
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001357 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001358 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001359 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001360 if (compat20) {
1361 packet_start(SSH2_MSG_CHANNEL_OPEN);
1362 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001363 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001364 packet_put_int(nc->local_window_max);
1365 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001366 /* originator ipaddr and port */
1367 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001368 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001369 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001370 } else {
1371 packet_put_int(remote_port);
1372 }
Damien Millerbd483e72000-04-30 10:00:53 +10001373 packet_send();
1374 } else {
1375 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001376 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001377 if (packet_get_protocol_flags() &
1378 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001379 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001380 packet_send();
1381 }
Darren Tuckera627d422013-06-02 07:31:17 +10001382 free(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001383 }
1384}
1385
Ben Lindstrombba81212001-06-25 05:01:22 +00001386static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001387port_open_helper(Channel *c, char *rtype)
1388{
1389 int direct;
1390 char buf[1024];
Damien Miller4def1842013-12-29 17:45:26 +11001391 char *local_ipaddr = get_local_ipaddr(c->sock);
Damien Miller0890dc82014-02-24 15:56:07 +11001392 int local_port = c->sock == -1 ? 65536 : get_sock_port(c->sock, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001393 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001394 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001395
Damien Millerd6369432010-02-02 17:02:07 +11001396 if (remote_port == -1) {
1397 /* Fake addr/port to appease peers that validate it (Tectia) */
Darren Tuckera627d422013-06-02 07:31:17 +10001398 free(remote_ipaddr);
Damien Millerd6369432010-02-02 17:02:07 +11001399 remote_ipaddr = xstrdup("127.0.0.1");
1400 remote_port = 65535;
1401 }
1402
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001403 direct = (strcmp(rtype, "direct-tcpip") == 0);
1404
1405 snprintf(buf, sizeof buf,
1406 "%s: listening port %d for %.100s port %d, "
Damien Miller4def1842013-12-29 17:45:26 +11001407 "connect from %.200s port %d to %.100s port %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001408 rtype, c->listening_port, c->path, c->host_port,
Damien Miller4def1842013-12-29 17:45:26 +11001409 remote_ipaddr, remote_port, local_ipaddr, local_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001410
Darren Tuckera627d422013-06-02 07:31:17 +10001411 free(c->remote_name);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001412 c->remote_name = xstrdup(buf);
1413
1414 if (compat20) {
1415 packet_start(SSH2_MSG_CHANNEL_OPEN);
1416 packet_put_cstring(rtype);
1417 packet_put_int(c->self);
1418 packet_put_int(c->local_window_max);
1419 packet_put_int(c->local_maxpacket);
1420 if (direct) {
1421 /* target host, port */
1422 packet_put_cstring(c->path);
1423 packet_put_int(c->host_port);
1424 } else {
1425 /* listen address, port */
1426 packet_put_cstring(c->path);
Damien Miller4def1842013-12-29 17:45:26 +11001427 packet_put_int(local_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001428 }
1429 /* originator host and port */
1430 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001431 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001432 packet_send();
1433 } else {
1434 packet_start(SSH_MSG_PORT_OPEN);
1435 packet_put_int(c->self);
1436 packet_put_cstring(c->path);
1437 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001438 if (packet_get_protocol_flags() &
1439 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001440 packet_put_cstring(c->remote_name);
1441 packet_send();
1442 }
Darren Tuckera627d422013-06-02 07:31:17 +10001443 free(remote_ipaddr);
Damien Miller4def1842013-12-29 17:45:26 +11001444 free(local_ipaddr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001445}
1446
Damien Miller5e7fd072005-11-05 14:53:39 +11001447static void
1448channel_set_reuseaddr(int fd)
1449{
1450 int on = 1;
1451
1452 /*
1453 * Set socket options.
1454 * Allow local port reuse in TIME_WAIT.
1455 */
1456 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1457 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1458}
1459
Damien Millerb38eff82000-04-01 11:09:21 +10001460/*
1461 * This socket is listening for connections to a forwarded TCP/IP port.
1462 */
Damien Miller8473dd82006-07-24 14:08:32 +10001463/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001464static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001465channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001466{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001467 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001468 struct sockaddr_storage addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001469 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001470 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001471 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001472
Damien Millerb38eff82000-04-01 11:09:21 +10001473 if (FD_ISSET(c->sock, readset)) {
1474 debug("Connection to port %d forwarding "
1475 "to %.100s port %d requested.",
1476 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001477
Damien Miller4623a752001-10-10 15:03:58 +10001478 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1479 nextstate = SSH_CHANNEL_OPENING;
1480 rtype = "forwarded-tcpip";
1481 } else {
1482 if (c->host_port == 0) {
1483 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001484 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001485 } else {
1486 nextstate = SSH_CHANNEL_OPENING;
1487 rtype = "direct-tcpip";
1488 }
1489 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001490
Damien Millerb38eff82000-04-01 11:09:21 +10001491 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001492 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001493 if (newsock < 0) {
Damien Miller37f1c082013-04-23 15:20:43 +10001494 if (errno != EINTR && errno != EWOULDBLOCK &&
1495 errno != ECONNABORTED)
1496 error("accept: %.100s", strerror(errno));
Damien Millera6508752012-04-22 11:21:10 +10001497 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001498 c->notbefore = monotime() + 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001499 return;
1500 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001501 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001502 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1503 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001504 nc->listening_port = c->listening_port;
1505 nc->host_port = c->host_port;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001506 if (c->path != NULL)
1507 nc->path = xstrdup(c->path);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001508
Darren Tucker876045b2010-01-08 17:08:00 +11001509 if (nextstate != SSH_CHANNEL_DYNAMIC)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001510 port_open_helper(nc, rtype);
Damien Millerb38eff82000-04-01 11:09:21 +10001511 }
1512}
1513
1514/*
1515 * This is the authentication agent socket listening for connections from
1516 * clients.
1517 */
Damien Miller8473dd82006-07-24 14:08:32 +10001518/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001519static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001520channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001521{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001522 Channel *nc;
1523 int newsock;
Damien Miller163886f2008-07-14 11:28:58 +10001524 struct sockaddr_storage addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001525 socklen_t addrlen;
1526
1527 if (FD_ISSET(c->sock, readset)) {
1528 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001529 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001530 if (newsock < 0) {
Damien Millera6508752012-04-22 11:21:10 +10001531 error("accept from auth socket: %.100s",
1532 strerror(errno));
1533 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001534 c->notbefore = monotime() + 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001535 return;
1536 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001537 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001538 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1539 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001540 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001541 if (compat20) {
1542 packet_start(SSH2_MSG_CHANNEL_OPEN);
1543 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001544 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001545 packet_put_int(c->local_window_max);
1546 packet_put_int(c->local_maxpacket);
1547 } else {
1548 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001549 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001550 }
Damien Millerb38eff82000-04-01 11:09:21 +10001551 packet_send();
1552 }
1553}
1554
Damien Miller8473dd82006-07-24 14:08:32 +10001555/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001556static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001557channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001558{
Damien Millerbd740252008-05-19 15:37:09 +10001559 int err = 0, sock;
Ben Lindstrom11180952001-07-04 05:13:35 +00001560 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001561
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001562 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001563 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001564 err = errno;
1565 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001566 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001567 if (err == 0) {
Damien Millerbd740252008-05-19 15:37:09 +10001568 debug("channel %d: connected to %s port %d",
1569 c->self, c->connect_ctx.host, c->connect_ctx.port);
1570 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001571 c->type = SSH_CHANNEL_OPEN;
1572 if (compat20) {
1573 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1574 packet_put_int(c->remote_id);
1575 packet_put_int(c->self);
1576 packet_put_int(c->local_window);
1577 packet_put_int(c->local_maxpacket);
1578 } else {
1579 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1580 packet_put_int(c->remote_id);
1581 packet_put_int(c->self);
1582 }
1583 } else {
Damien Millerbd740252008-05-19 15:37:09 +10001584 debug("channel %d: connection failed: %s",
Ben Lindstrom69128662001-05-08 20:07:39 +00001585 c->self, strerror(err));
Damien Millerbd740252008-05-19 15:37:09 +10001586 /* Try next address, if any */
1587 if ((sock = connect_next(&c->connect_ctx)) > 0) {
1588 close(c->sock);
1589 c->sock = c->rfd = c->wfd = sock;
1590 channel_max_fd = channel_find_maxfd();
1591 return;
1592 }
1593 /* Exhausted all addresses */
1594 error("connect_to %.100s port %d: failed.",
1595 c->connect_ctx.host, c->connect_ctx.port);
1596 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001597 if (compat20) {
1598 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1599 packet_put_int(c->remote_id);
1600 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1601 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1602 packet_put_cstring(strerror(err));
1603 packet_put_cstring("");
1604 }
1605 } else {
1606 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1607 packet_put_int(c->remote_id);
1608 }
1609 chan_mark_dead(c);
1610 }
1611 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001612 }
1613}
1614
Damien Miller8473dd82006-07-24 14:08:32 +10001615/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001616static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001617channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001618{
Darren Tucker11327cc2005-03-14 23:22:25 +11001619 char buf[CHAN_RBUF];
Damien Miller835284b2007-06-11 13:03:16 +10001620 int len, force;
Damien Millerb38eff82000-04-01 11:09:21 +10001621
Damien Miller835284b2007-06-11 13:03:16 +10001622 force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED;
1623 if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001624 errno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001625 len = read(c->rfd, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +10001626 if (len < 0 && (errno == EINTR ||
1627 ((errno == EAGAIN || errno == EWOULDBLOCK) && !force)))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001628 return 1;
Darren Tucker9afe1152006-06-23 21:24:12 +10001629#ifndef PTY_ZEROREAD
Damien Millerb38eff82000-04-01 11:09:21 +10001630 if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001631#else
Darren Tucker144e8d62006-06-25 08:25:25 +10001632 if ((!c->isatty && len <= 0) ||
1633 (c->isatty && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001634#endif
Damien Millerfbdeece2003-09-02 22:52:31 +10001635 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001636 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001637 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001638 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001639 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001640 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001641 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001642 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001643 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001644 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001645 } else {
1646 chan_read_failed(c);
1647 }
1648 return -1;
1649 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001650 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001651 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001652 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001653 chan_read_failed(c);
1654 }
Damien Millerd27b9472005-12-13 19:29:02 +11001655 } else if (c->datagram) {
1656 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001657 } else {
1658 buffer_append(&c->input, buf, len);
1659 }
Damien Millerb38eff82000-04-01 11:09:21 +10001660 }
1661 return 1;
1662}
Damien Miller4f7becb2006-03-26 14:10:14 +11001663
Damien Miller8473dd82006-07-24 14:08:32 +10001664/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001665static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001666channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001667{
Ben Lindstrome229b252001-03-05 06:28:06 +00001668 struct termios tio;
Damien Miller077b2382005-12-31 16:22:32 +11001669 u_char *data = NULL, *buf;
Damien Miller7d457182010-08-05 23:09:48 +10001670 u_int dlen, olen = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001671 int len;
1672
1673 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001674 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001675 FD_ISSET(c->wfd, writeset) &&
1676 buffer_len(&c->output) > 0) {
Damien Miller7d457182010-08-05 23:09:48 +10001677 olen = buffer_len(&c->output);
Damien Miller077b2382005-12-31 16:22:32 +11001678 if (c->output_filter != NULL) {
1679 if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1680 debug2("channel %d: filter stops", c->self);
Damien Millere204f6a2006-01-31 21:47:15 +11001681 if (c->type != SSH_CHANNEL_OPEN)
1682 chan_mark_dead(c);
1683 else
1684 chan_write_failed(c);
1685 return -1;
Damien Miller077b2382005-12-31 16:22:32 +11001686 }
1687 } else if (c->datagram) {
1688 buf = data = buffer_get_string(&c->output, &dlen);
1689 } else {
1690 buf = data = buffer_ptr(&c->output);
1691 dlen = buffer_len(&c->output);
1692 }
1693
Damien Millerd27b9472005-12-13 19:29:02 +11001694 if (c->datagram) {
Damien Millerd27b9472005-12-13 19:29:02 +11001695 /* ignore truncated writes, datagrams might get lost */
Damien Miller077b2382005-12-31 16:22:32 +11001696 len = write(c->wfd, buf, dlen);
Darren Tuckera627d422013-06-02 07:31:17 +10001697 free(data);
Damien Millerd8968ad2008-07-04 23:10:49 +10001698 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1699 errno == EWOULDBLOCK))
Damien Millerd27b9472005-12-13 19:29:02 +11001700 return 1;
1701 if (len <= 0) {
1702 if (c->type != SSH_CHANNEL_OPEN)
1703 chan_mark_dead(c);
1704 else
1705 chan_write_failed(c);
1706 return -1;
1707 }
Damien Miller7d457182010-08-05 23:09:48 +10001708 goto out;
Damien Millerd27b9472005-12-13 19:29:02 +11001709 }
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001710#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001711 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001712 if (compat20 && c->wfd_isatty)
1713 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001714#endif
Damien Miller077b2382005-12-31 16:22:32 +11001715
1716 len = write(c->wfd, buf, dlen);
Damien Millerd8968ad2008-07-04 23:10:49 +10001717 if (len < 0 &&
1718 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001719 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001720 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001721 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001722 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001723 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001724 return -1;
1725 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001726 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001727 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001728 c->type = SSH_CHANNEL_INPUT_DRAINING;
1729 } else {
1730 chan_write_failed(c);
1731 }
1732 return -1;
1733 }
Darren Tucker3980b632009-08-28 11:02:37 +10001734#ifndef BROKEN_TCGETATTR_ICANON
Damien Miller077b2382005-12-31 16:22:32 +11001735 if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001736 if (tcgetattr(c->wfd, &tio) == 0 &&
1737 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1738 /*
1739 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001740 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001741 * size of a SSH2_MSG_CHANNEL_DATA message
Damien Miller077b2382005-12-31 16:22:32 +11001742 * (4 byte channel id + buf)
Damien Miller79438cc2001-02-16 12:34:57 +11001743 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001744 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001745 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001746 }
1747 }
Darren Tucker3980b632009-08-28 11:02:37 +10001748#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001749 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001750 }
Damien Miller7d457182010-08-05 23:09:48 +10001751 out:
1752 if (compat20 && olen > 0)
1753 c->local_consumed += olen - buffer_len(&c->output);
Damien Miller33b13562000-04-04 14:38:59 +10001754 return 1;
1755}
Damien Miller4f7becb2006-03-26 14:10:14 +11001756
Ben Lindstrombba81212001-06-25 05:01:22 +00001757static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001758channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller33b13562000-04-04 14:38:59 +10001759{
Darren Tucker11327cc2005-03-14 23:22:25 +11001760 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001761 int len;
1762
Damien Miller1383bd82000-04-06 12:32:37 +10001763/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001764 if (c->efd != -1) {
1765 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1766 FD_ISSET(c->efd, writeset) &&
1767 buffer_len(&c->extended) > 0) {
1768 len = write(c->efd, buffer_ptr(&c->extended),
1769 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001770 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001771 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001772 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1773 errno == EWOULDBLOCK))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001774 return 1;
1775 if (len <= 0) {
1776 debug2("channel %d: closing write-efd %d",
1777 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001778 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001779 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001780 buffer_consume(&c->extended, len);
1781 c->local_consumed += len;
1782 }
Damien Miller8853ca52010-06-26 10:00:14 +10001783 } else if (c->efd != -1 &&
1784 (c->extended_usage == CHAN_EXTENDED_READ ||
1785 c->extended_usage == CHAN_EXTENDED_IGNORE) &&
Damien Millere42bd242007-01-29 10:16:28 +11001786 (c->detach_close || FD_ISSET(c->efd, readset))) {
Damien Miller33b13562000-04-04 14:38:59 +10001787 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001788 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001789 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001790 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
1791 errno == EWOULDBLOCK) && !c->detach_close)))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001792 return 1;
1793 if (len <= 0) {
1794 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001795 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001796 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001797 } else {
Damien Miller8853ca52010-06-26 10:00:14 +10001798 if (c->extended_usage == CHAN_EXTENDED_IGNORE) {
1799 debug3("channel %d: discard efd",
1800 c->self);
1801 } else
1802 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001803 }
Damien Miller33b13562000-04-04 14:38:59 +10001804 }
1805 }
1806 return 1;
1807}
Damien Miller4f7becb2006-03-26 14:10:14 +11001808
Damien Miller0e220db2004-06-15 10:34:08 +10001809static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001810channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001811{
Ben Lindstromb3921512001-04-11 15:57:50 +00001812 if (c->type == SSH_CHANNEL_OPEN &&
1813 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Darren Tuckerae09cb82007-06-25 19:04:46 +10001814 ((c->local_window_max - c->local_window >
Damien Miller3191a8e2007-06-11 18:33:15 +10001815 c->local_maxpacket*3) ||
1816 c->local_window < c->local_window_max/2) &&
Damien Miller33b13562000-04-04 14:38:59 +10001817 c->local_consumed > 0) {
1818 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1819 packet_put_int(c->remote_id);
1820 packet_put_int(c->local_consumed);
1821 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001822 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001823 c->self, c->local_window,
1824 c->local_consumed);
1825 c->local_window += c->local_consumed;
1826 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001827 }
1828 return 1;
1829}
1830
Ben Lindstrombba81212001-06-25 05:01:22 +00001831static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001832channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001833{
1834 channel_handle_rfd(c, readset, writeset);
1835 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001836 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001837 return;
Damien Miller33b13562000-04-04 14:38:59 +10001838 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001839 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001840}
1841
Damien Millere1537f92010-01-26 13:26:22 +11001842static u_int
1843read_mux(Channel *c, u_int need)
1844{
1845 char buf[CHAN_RBUF];
1846 int len;
1847 u_int rlen;
1848
1849 if (buffer_len(&c->input) < need) {
1850 rlen = need - buffer_len(&c->input);
1851 len = read(c->rfd, buf, MIN(rlen, CHAN_RBUF));
1852 if (len <= 0) {
1853 if (errno != EINTR && errno != EAGAIN) {
1854 debug2("channel %d: ctl read<=0 rfd %d len %d",
1855 c->self, c->rfd, len);
1856 chan_read_failed(c);
1857 return 0;
1858 }
1859 } else
1860 buffer_append(&c->input, buf, len);
1861 }
1862 return buffer_len(&c->input);
1863}
1864
1865static void
1866channel_post_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
1867{
1868 u_int need;
1869 ssize_t len;
1870
1871 if (!compat20)
1872 fatal("%s: entered with !compat20", __func__);
1873
Damien Millerd530f5f2010-05-21 14:57:10 +10001874 if (c->rfd != -1 && !c->mux_pause && FD_ISSET(c->rfd, readset) &&
Damien Millere1537f92010-01-26 13:26:22 +11001875 (c->istate == CHAN_INPUT_OPEN ||
1876 c->istate == CHAN_INPUT_WAIT_DRAIN)) {
1877 /*
1878 * Don't not read past the precise end of packets to
1879 * avoid disrupting fd passing.
1880 */
1881 if (read_mux(c, 4) < 4) /* read header */
1882 return;
1883 need = get_u32(buffer_ptr(&c->input));
1884#define CHANNEL_MUX_MAX_PACKET (256 * 1024)
1885 if (need > CHANNEL_MUX_MAX_PACKET) {
1886 debug2("channel %d: packet too big %u > %u",
1887 c->self, CHANNEL_MUX_MAX_PACKET, need);
1888 chan_rcvd_oclose(c);
1889 return;
1890 }
1891 if (read_mux(c, need + 4) < need + 4) /* read body */
1892 return;
1893 if (c->mux_rcb(c) != 0) {
1894 debug("channel %d: mux_rcb failed", c->self);
1895 chan_mark_dead(c);
1896 return;
1897 }
1898 }
1899
1900 if (c->wfd != -1 && FD_ISSET(c->wfd, writeset) &&
1901 buffer_len(&c->output) > 0) {
1902 len = write(c->wfd, buffer_ptr(&c->output),
1903 buffer_len(&c->output));
1904 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1905 return;
1906 if (len <= 0) {
1907 chan_mark_dead(c);
1908 return;
1909 }
1910 buffer_consume(&c->output, len);
1911 }
1912}
1913
1914static void
1915channel_post_mux_listener(Channel *c, fd_set *readset, fd_set *writeset)
1916{
1917 Channel *nc;
1918 struct sockaddr_storage addr;
1919 socklen_t addrlen;
1920 int newsock;
1921 uid_t euid;
1922 gid_t egid;
1923
1924 if (!FD_ISSET(c->sock, readset))
1925 return;
1926
1927 debug("multiplexing control connection");
1928
1929 /*
1930 * Accept connection on control socket
1931 */
1932 memset(&addr, 0, sizeof(addr));
1933 addrlen = sizeof(addr);
1934 if ((newsock = accept(c->sock, (struct sockaddr*)&addr,
1935 &addrlen)) == -1) {
1936 error("%s accept: %s", __func__, strerror(errno));
Damien Millera6508752012-04-22 11:21:10 +10001937 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001938 c->notbefore = monotime() + 1;
Damien Millere1537f92010-01-26 13:26:22 +11001939 return;
1940 }
1941
1942 if (getpeereid(newsock, &euid, &egid) < 0) {
1943 error("%s getpeereid failed: %s", __func__,
1944 strerror(errno));
1945 close(newsock);
1946 return;
1947 }
1948 if ((euid != 0) && (getuid() != euid)) {
1949 error("multiplex uid mismatch: peer euid %u != uid %u",
1950 (u_int)euid, (u_int)getuid());
1951 close(newsock);
1952 return;
1953 }
1954 nc = channel_new("multiplex client", SSH_CHANNEL_MUX_CLIENT,
1955 newsock, newsock, -1, c->local_window_max,
1956 c->local_maxpacket, 0, "mux-control", 1);
1957 nc->mux_rcb = c->mux_rcb;
1958 debug3("%s: new mux channel %d fd %d", __func__,
1959 nc->self, nc->sock);
1960 /* establish state */
1961 nc->mux_rcb(nc);
1962 /* mux state transitions must not elicit protocol messages */
1963 nc->flags |= CHAN_LOCAL;
1964}
1965
Damien Miller8473dd82006-07-24 14:08:32 +10001966/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001967static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001968channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001969{
1970 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001971
Damien Millerb38eff82000-04-01 11:09:21 +10001972 /* Send buffered output data to the socket. */
1973 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1974 len = write(c->sock, buffer_ptr(&c->output),
1975 buffer_len(&c->output));
1976 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001977 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001978 else
1979 buffer_consume(&c->output, len);
1980 }
1981}
1982
Ben Lindstrombba81212001-06-25 05:01:22 +00001983static void
Damien Miller33b13562000-04-04 14:38:59 +10001984channel_handler_init_20(void)
1985{
Damien Millerde6987c2002-01-22 23:20:40 +11001986 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001987 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001988 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001989 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001990 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001991 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001992 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001993 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millere1537f92010-01-26 13:26:22 +11001994 channel_pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener;
1995 channel_pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10001996
Damien Millerde6987c2002-01-22 23:20:40 +11001997 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001998 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001999 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10002000 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002001 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002002 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002003 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millere1537f92010-01-26 13:26:22 +11002004 channel_post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener;
2005 channel_post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10002006}
2007
Ben Lindstrombba81212001-06-25 05:01:22 +00002008static void
Damien Millerb38eff82000-04-01 11:09:21 +10002009channel_handler_init_13(void)
2010{
2011 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
2012 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
2013 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2014 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2015 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
2016 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
2017 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002018 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002019 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10002020
Damien Millerde6987c2002-01-22 23:20:40 +11002021 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002022 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2023 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2024 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
2025 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002026 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002027 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002028}
2029
Ben Lindstrombba81212001-06-25 05:01:22 +00002030static void
Damien Millerb38eff82000-04-01 11:09:21 +10002031channel_handler_init_15(void)
2032{
Damien Millerde6987c2002-01-22 23:20:40 +11002033 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10002034 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002035 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2036 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2037 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002038 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002039 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10002040
2041 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2042 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2043 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11002044 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002045 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002046 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002047}
2048
Ben Lindstrombba81212001-06-25 05:01:22 +00002049static void
Damien Millerb38eff82000-04-01 11:09:21 +10002050channel_handler_init(void)
2051{
2052 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002053
Damien Miller9f0f5c62001-12-21 14:45:46 +11002054 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10002055 channel_pre[i] = NULL;
2056 channel_post[i] = NULL;
2057 }
Damien Miller33b13562000-04-04 14:38:59 +10002058 if (compat20)
2059 channel_handler_init_20();
2060 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002061 channel_handler_init_13();
2062 else
2063 channel_handler_init_15();
2064}
2065
Damien Miller3ec27592001-10-12 11:35:04 +10002066/* gc dead channels */
2067static void
2068channel_garbage_collect(Channel *c)
2069{
2070 if (c == NULL)
2071 return;
2072 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11002073 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10002074 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002075 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002076 c->detach_user(c->self, NULL);
2077 /* if we still have a callback */
2078 if (c->detach_user != NULL)
2079 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002080 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002081 }
2082 if (!chan_is_dead(c, 1))
2083 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002084 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002085 channel_free(c);
2086}
2087
Ben Lindstrombba81212001-06-25 05:01:22 +00002088static void
Damien Millera6508752012-04-22 11:21:10 +10002089channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset,
2090 time_t *unpause_secs)
Damien Millerb38eff82000-04-01 11:09:21 +10002091{
2092 static int did_init = 0;
Darren Tucker876045b2010-01-08 17:08:00 +11002093 u_int i, oalloc;
Damien Millerb38eff82000-04-01 11:09:21 +10002094 Channel *c;
Damien Millera6508752012-04-22 11:21:10 +10002095 time_t now;
Damien Millerb38eff82000-04-01 11:09:21 +10002096
2097 if (!did_init) {
2098 channel_handler_init();
2099 did_init = 1;
2100 }
Darren Tuckerb759c9c2013-06-02 07:46:16 +10002101 now = monotime();
Damien Millera6508752012-04-22 11:21:10 +10002102 if (unpause_secs != NULL)
2103 *unpause_secs = 0;
Darren Tucker876045b2010-01-08 17:08:00 +11002104 for (i = 0, oalloc = channels_alloc; i < oalloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002105 c = channels[i];
2106 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10002107 continue;
Darren Tucker876045b2010-01-08 17:08:00 +11002108 if (c->delayed) {
2109 if (ftab == channel_pre)
2110 c->delayed = 0;
2111 else
2112 continue;
2113 }
Damien Millera6508752012-04-22 11:21:10 +10002114 if (ftab[c->type] != NULL) {
2115 /*
2116 * Run handlers that are not paused.
2117 */
2118 if (c->notbefore <= now)
2119 (*ftab[c->type])(c, readset, writeset);
2120 else if (unpause_secs != NULL) {
2121 /*
2122 * Collect the time that the earliest
2123 * channel comes off pause.
2124 */
2125 debug3("%s: chan %d: skip for %d more seconds",
2126 __func__, c->self,
2127 (int)(c->notbefore - now));
2128 if (*unpause_secs == 0 ||
2129 (c->notbefore - now) < *unpause_secs)
2130 *unpause_secs = c->notbefore - now;
2131 }
2132 }
Damien Miller3ec27592001-10-12 11:35:04 +10002133 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002134 }
Damien Millera6508752012-04-22 11:21:10 +10002135 if (unpause_secs != NULL && *unpause_secs != 0)
2136 debug3("%s: first channel unpauses in %d seconds",
2137 __func__, (int)*unpause_secs);
Damien Millerb38eff82000-04-01 11:09:21 +10002138}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002139
Ben Lindstrome9c99912001-06-09 00:41:05 +00002140/*
2141 * Allocate/update select bitmasks and add any bits relevant to channels in
2142 * select bitmasks.
2143 */
Damien Miller4af51302000-04-16 11:18:38 +10002144void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002145channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Damien Millerba77e1f2012-04-23 18:21:05 +10002146 u_int *nallocp, time_t *minwait_secs, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002147{
Damien Miller36812092006-03-26 14:22:47 +11002148 u_int n, sz, nfdset;
Damien Miller5e953212001-01-30 09:14:00 +11002149
2150 n = MAX(*maxfdp, channel_max_fd);
2151
Damien Miller36812092006-03-26 14:22:47 +11002152 nfdset = howmany(n+1, NFDBITS);
2153 /* Explicitly test here, because xrealloc isn't always called */
2154 if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask))
2155 fatal("channel_prepare_select: max_fd (%d) is too large", n);
2156 sz = nfdset * sizeof(fd_mask);
2157
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002158 /* perhaps check sz < nalloc/2 and shrink? */
2159 if (*readsetp == NULL || sz > *nallocp) {
Damien Miller36812092006-03-26 14:22:47 +11002160 *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask));
2161 *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask));
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002162 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11002163 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002164 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11002165 memset(*readsetp, 0, sz);
2166 memset(*writesetp, 0, sz);
2167
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002168 if (!rekeying)
Damien Millera6508752012-04-22 11:21:10 +10002169 channel_handler(channel_pre, *readsetp, *writesetp,
2170 minwait_secs);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002171}
2172
Ben Lindstrome9c99912001-06-09 00:41:05 +00002173/*
2174 * After select, perform any appropriate operations for channels which have
2175 * events pending.
2176 */
Damien Miller4af51302000-04-16 11:18:38 +10002177void
Damien Millerd62f2ca2006-03-26 13:57:41 +11002178channel_after_select(fd_set *readset, fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002179{
Damien Millera6508752012-04-22 11:21:10 +10002180 channel_handler(channel_post, readset, writeset, NULL);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002181}
2182
Ben Lindstrome9c99912001-06-09 00:41:05 +00002183
Damien Miller5e953212001-01-30 09:14:00 +11002184/* If there is data to send to the connection, enqueue some of it now. */
Damien Miller4af51302000-04-16 11:18:38 +10002185void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002186channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002187{
Damien Millerb38eff82000-04-01 11:09:21 +10002188 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002189 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002190
Damien Miller95def091999-11-25 00:26:21 +11002191 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002192 c = channels[i];
2193 if (c == NULL)
2194 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002195
Ben Lindstrome9c99912001-06-09 00:41:05 +00002196 /*
2197 * We are only interested in channels that can have buffered
2198 * incoming data.
2199 */
Damien Miller34132e52000-01-14 15:45:46 +11002200 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10002201 if (c->type != SSH_CHANNEL_OPEN &&
2202 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11002203 continue;
2204 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10002205 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002206 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002207 }
Damien Millerefb4afe2000-04-12 18:45:05 +10002208 if (compat20 &&
2209 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002210 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10002211 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002212 continue;
2213 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002214
Damien Miller95def091999-11-25 00:26:21 +11002215 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002216 if ((c->istate == CHAN_INPUT_OPEN ||
2217 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
2218 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11002219 if (c->datagram) {
2220 if (len > 0) {
2221 u_char *data;
2222 u_int dlen;
2223
2224 data = buffer_get_string(&c->input,
2225 &dlen);
Damien Miller7d457182010-08-05 23:09:48 +10002226 if (dlen > c->remote_window ||
2227 dlen > c->remote_maxpacket) {
2228 debug("channel %d: datagram "
2229 "too big for channel",
2230 c->self);
Darren Tuckera627d422013-06-02 07:31:17 +10002231 free(data);
Damien Miller7d457182010-08-05 23:09:48 +10002232 continue;
2233 }
Damien Millerd27b9472005-12-13 19:29:02 +11002234 packet_start(SSH2_MSG_CHANNEL_DATA);
2235 packet_put_int(c->remote_id);
2236 packet_put_string(data, dlen);
2237 packet_send();
2238 c->remote_window -= dlen + 4;
Darren Tuckera627d422013-06-02 07:31:17 +10002239 free(data);
Damien Millerd27b9472005-12-13 19:29:02 +11002240 }
2241 continue;
2242 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002243 /*
2244 * Send some data for the other side over the secure
2245 * connection.
2246 */
Damien Miller33b13562000-04-04 14:38:59 +10002247 if (compat20) {
2248 if (len > c->remote_window)
2249 len = c->remote_window;
2250 if (len > c->remote_maxpacket)
2251 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11002252 } else {
Damien Miller33b13562000-04-04 14:38:59 +10002253 if (packet_is_interactive()) {
2254 if (len > 1024)
2255 len = 512;
2256 } else {
2257 /* Keep the packets at reasonable size. */
2258 if (len > packet_get_maxsize()/2)
2259 len = packet_get_maxsize()/2;
2260 }
Damien Miller95def091999-11-25 00:26:21 +11002261 }
Damien Millerb38eff82000-04-01 11:09:21 +10002262 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10002263 packet_start(compat20 ?
2264 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10002265 packet_put_int(c->remote_id);
2266 packet_put_string(buffer_ptr(&c->input), len);
2267 packet_send();
2268 buffer_consume(&c->input, len);
2269 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10002270 }
2271 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11002272 if (compat13)
2273 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11002274 /*
2275 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00002276 * tell peer, that we will not send more data: send IEOF.
2277 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11002278 */
Ben Lindstromcf159442002-03-26 03:26:24 +00002279 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10002280 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
2281 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00002282 else
2283 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11002284 }
Damien Miller33b13562000-04-04 14:38:59 +10002285 /* Send extended data, i.e. stderr */
2286 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00002287 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10002288 c->remote_window > 0 &&
2289 (len = buffer_len(&c->extended)) > 0 &&
2290 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002291 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002292 c->self, c->remote_window, buffer_len(&c->extended),
2293 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10002294 if (len > c->remote_window)
2295 len = c->remote_window;
2296 if (len > c->remote_maxpacket)
2297 len = c->remote_maxpacket;
2298 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
2299 packet_put_int(c->remote_id);
2300 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
2301 packet_put_string(buffer_ptr(&c->extended), len);
2302 packet_send();
2303 buffer_consume(&c->extended, len);
2304 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002305 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10002306 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002307 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002308}
2309
Ben Lindstrome9c99912001-06-09 00:41:05 +00002310
2311/* -- protocol input */
Damien Millerd79b4242006-03-31 23:11:44 +11002312
2313/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002314void
Damien Miller630d6f42002-01-22 23:17:30 +11002315channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002316{
Damien Miller34132e52000-01-14 15:45:46 +11002317 int id;
Damien Miller633de332014-05-15 13:48:26 +10002318 const u_char *data;
Damien Miller7d457182010-08-05 23:09:48 +10002319 u_int data_len, win_len;
Damien Millerb38eff82000-04-01 11:09:21 +10002320 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002321
Damien Miller95def091999-11-25 00:26:21 +11002322 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11002323 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10002324 c = channel_lookup(id);
2325 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11002326 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002327
Damien Miller95def091999-11-25 00:26:21 +11002328 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10002329 if (c->type != SSH_CHANNEL_OPEN &&
2330 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002331 return;
2332
Damien Miller95def091999-11-25 00:26:21 +11002333 /* Get the data. */
Damien Millerdb255ca2008-05-19 14:59:37 +10002334 data = packet_get_string_ptr(&data_len);
Damien Miller7d457182010-08-05 23:09:48 +10002335 win_len = data_len;
2336 if (c->datagram)
2337 win_len += 4; /* string length header */
Damien Millerb38eff82000-04-01 11:09:21 +10002338
Damien Millera04ad492004-01-21 11:02:09 +11002339 /*
2340 * Ignore data for protocol > 1.3 if output end is no longer open.
2341 * For protocol 2 the sending side is reducing its window as it sends
2342 * data, so we must 'fake' consumption of the data in order to ensure
2343 * that window updates are sent back. Otherwise the connection might
2344 * deadlock.
2345 */
2346 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
2347 if (compat20) {
Damien Miller7d457182010-08-05 23:09:48 +10002348 c->local_window -= win_len;
2349 c->local_consumed += win_len;
Damien Millera04ad492004-01-21 11:02:09 +11002350 }
Damien Millera04ad492004-01-21 11:02:09 +11002351 return;
2352 }
2353
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002354 if (compat20) {
Damien Miller7d457182010-08-05 23:09:48 +10002355 if (win_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10002356 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller7d457182010-08-05 23:09:48 +10002357 c->self, win_len, c->local_maxpacket);
Damien Miller33b13562000-04-04 14:38:59 +10002358 }
Damien Miller7d457182010-08-05 23:09:48 +10002359 if (win_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002360 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller7d457182010-08-05 23:09:48 +10002361 c->self, win_len, c->local_window);
Damien Miller33b13562000-04-04 14:38:59 +10002362 return;
2363 }
Damien Miller7d457182010-08-05 23:09:48 +10002364 c->local_window -= win_len;
Damien Miller33b13562000-04-04 14:38:59 +10002365 }
Damien Millerd27b9472005-12-13 19:29:02 +11002366 if (c->datagram)
2367 buffer_put_string(&c->output, data, data_len);
2368 else
2369 buffer_append(&c->output, data, data_len);
Damien Millerdb255ca2008-05-19 14:59:37 +10002370 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002371}
Ben Lindstrome9c99912001-06-09 00:41:05 +00002372
Damien Millerd79b4242006-03-31 23:11:44 +11002373/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002374void
Damien Miller630d6f42002-01-22 23:17:30 +11002375channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002376{
2377 int id;
Damien Miller33b13562000-04-04 14:38:59 +10002378 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00002379 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10002380 Channel *c;
2381
2382 /* Get the channel number and verify it. */
2383 id = packet_get_int();
2384 c = channel_lookup(id);
2385
2386 if (c == NULL)
2387 packet_disconnect("Received extended_data for bad channel %d.", id);
2388 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002389 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10002390 return;
2391 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002392 if (c->flags & CHAN_EOF_RCVD) {
2393 if (datafellows & SSH_BUG_EXTEOF)
2394 debug("channel %d: accepting ext data after eof", id);
2395 else
2396 packet_disconnect("Received extended_data after EOF "
2397 "on channel %d.", id);
2398 }
Damien Miller33b13562000-04-04 14:38:59 +10002399 tcode = packet_get_int();
2400 if (c->efd == -1 ||
2401 c->extended_usage != CHAN_EXTENDED_WRITE ||
2402 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002403 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002404 return;
2405 }
2406 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002407 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002408 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002409 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002410 c->self, data_len, c->local_window);
Darren Tuckera627d422013-06-02 07:31:17 +10002411 free(data);
Damien Miller33b13562000-04-04 14:38:59 +10002412 return;
2413 }
Damien Millerd3444942000-09-30 14:20:03 +11002414 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002415 c->local_window -= data_len;
2416 buffer_append(&c->extended, data, data_len);
Darren Tuckera627d422013-06-02 07:31:17 +10002417 free(data);
Damien Miller33b13562000-04-04 14:38:59 +10002418}
2419
Damien Millerd79b4242006-03-31 23:11:44 +11002420/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002421void
Damien Miller630d6f42002-01-22 23:17:30 +11002422channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002423{
2424 int id;
2425 Channel *c;
2426
Damien Millerb38eff82000-04-01 11:09:21 +10002427 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002428 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002429 c = channel_lookup(id);
2430 if (c == NULL)
2431 packet_disconnect("Received ieof for nonexistent channel %d.", id);
2432 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002433
2434 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002435 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002436 debug("channel %d: FORCE input drain", c->self);
2437 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002438 if (buffer_len(&c->input) == 0)
2439 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002440 }
2441
Damien Millerb38eff82000-04-01 11:09:21 +10002442}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002443
Damien Millerd79b4242006-03-31 23:11:44 +11002444/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002445void
Damien Miller630d6f42002-01-22 23:17:30 +11002446channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002447{
Damien Millerb38eff82000-04-01 11:09:21 +10002448 int id;
2449 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002450
Damien Millerb38eff82000-04-01 11:09:21 +10002451 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002452 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002453 c = channel_lookup(id);
2454 if (c == NULL)
2455 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002456
2457 /*
2458 * Send a confirmation that we have closed the channel and no more
2459 * data is coming for it.
2460 */
Damien Miller95def091999-11-25 00:26:21 +11002461 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002462 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002463 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002464
Damien Miller5428f641999-11-25 11:54:57 +11002465 /*
2466 * If the channel is in closed state, we have sent a close request,
2467 * and the other side will eventually respond with a confirmation.
2468 * Thus, we cannot free the channel here, because then there would be
2469 * no-one to receive the confirmation. The channel gets freed when
2470 * the confirmation arrives.
2471 */
Damien Millerb38eff82000-04-01 11:09:21 +10002472 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002473 /*
2474 * Not a closed channel - mark it as draining, which will
2475 * cause it to be freed later.
2476 */
Damien Miller76765c02002-01-22 23:21:15 +11002477 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002478 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002479 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002480}
2481
Damien Millerb38eff82000-04-01 11:09:21 +10002482/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Millerd79b4242006-03-31 23:11:44 +11002483/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002484void
Damien Miller630d6f42002-01-22 23:17:30 +11002485channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002486{
Damien Millerb38eff82000-04-01 11:09:21 +10002487 int id = packet_get_int();
2488 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002489
Damien Miller48b03fc2002-01-22 23:11:40 +11002490 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002491 if (c == NULL)
2492 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2493 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002494}
2495
Damien Millerd79b4242006-03-31 23:11:44 +11002496/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002497void
Damien Miller630d6f42002-01-22 23:17:30 +11002498channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002499{
2500 int id = packet_get_int();
2501 Channel *c = channel_lookup(id);
2502
Damien Miller48b03fc2002-01-22 23:11:40 +11002503 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002504 if (c == NULL)
2505 packet_disconnect("Received close confirmation for "
2506 "out-of-range channel %d.", id);
Damien Miller36187092013-06-10 13:07:11 +10002507 if (c->type != SSH_CHANNEL_CLOSED && c->type != SSH_CHANNEL_ABANDONED)
Damien Millerb38eff82000-04-01 11:09:21 +10002508 packet_disconnect("Received close confirmation for "
2509 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002510 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002511}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002512
Damien Millerd79b4242006-03-31 23:11:44 +11002513/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002514void
Damien Miller630d6f42002-01-22 23:17:30 +11002515channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002516{
Damien Millerb38eff82000-04-01 11:09:21 +10002517 int id, remote_id;
2518 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002519
Damien Millerb38eff82000-04-01 11:09:21 +10002520 id = packet_get_int();
2521 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002522
Damien Millerb38eff82000-04-01 11:09:21 +10002523 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2524 packet_disconnect("Received open confirmation for "
2525 "non-opening channel %d.", id);
2526 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002527 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002528 c->remote_id = remote_id;
2529 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002530
2531 if (compat20) {
2532 c->remote_window = packet_get_int();
2533 c->remote_maxpacket = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002534 if (c->open_confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002535 debug2("callback start");
Damien Millerd530f5f2010-05-21 14:57:10 +10002536 c->open_confirm(c->self, 1, c->open_confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002537 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002538 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002539 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002540 c->remote_window, c->remote_maxpacket);
2541 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002542 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002543}
2544
Ben Lindstrombba81212001-06-25 05:01:22 +00002545static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002546reason2txt(int reason)
2547{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002548 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002549 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2550 return "administratively prohibited";
2551 case SSH2_OPEN_CONNECT_FAILED:
2552 return "connect failed";
2553 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2554 return "unknown channel type";
2555 case SSH2_OPEN_RESOURCE_SHORTAGE:
2556 return "resource shortage";
2557 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002558 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002559}
2560
Damien Millerd79b4242006-03-31 23:11:44 +11002561/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002562void
Damien Miller630d6f42002-01-22 23:17:30 +11002563channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002564{
Kevin Steves12057502001-02-05 14:54:34 +00002565 int id, reason;
2566 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002567 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002568
Damien Millerb38eff82000-04-01 11:09:21 +10002569 id = packet_get_int();
2570 c = channel_lookup(id);
2571
2572 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2573 packet_disconnect("Received open failure for "
2574 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002575 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002576 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002577 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002578 msg = packet_get_string(NULL);
2579 lang = packet_get_string(NULL);
2580 }
Damien Miller996acd22003-04-09 20:59:48 +10002581 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002582 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Darren Tuckera627d422013-06-02 07:31:17 +10002583 free(msg);
2584 free(lang);
Damien Millerd530f5f2010-05-21 14:57:10 +10002585 if (c->open_confirm) {
2586 debug2("callback start");
2587 c->open_confirm(c->self, 0, c->open_confirm_ctx);
2588 debug2("callback done");
2589 }
Damien Miller33b13562000-04-04 14:38:59 +10002590 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002591 packet_check_eom();
Damien Miller7a606212009-01-28 16:22:34 +11002592 /* Schedule the channel for cleanup/deletion. */
2593 chan_mark_dead(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002594}
2595
Damien Millerd79b4242006-03-31 23:11:44 +11002596/* ARGSUSED */
Damien Miller33b13562000-04-04 14:38:59 +10002597void
Damien Miller630d6f42002-01-22 23:17:30 +11002598channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002599{
2600 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002601 int id;
2602 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002603
2604 if (!compat20)
2605 return;
2606
2607 /* Get the channel number and verify it. */
2608 id = packet_get_int();
2609 c = channel_lookup(id);
2610
Damien Millerd47c62a2005-12-13 19:33:57 +11002611 if (c == NULL) {
2612 logit("Received window adjust for non-open channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002613 return;
2614 }
2615 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002616 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002617 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002618 c->remote_window += adjust;
2619}
2620
Damien Millerd79b4242006-03-31 23:11:44 +11002621/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002622void
Damien Miller630d6f42002-01-22 23:17:30 +11002623channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002624{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002625 Channel *c = NULL;
2626 u_short host_port;
2627 char *host, *originator_string;
Damien Millerbd740252008-05-19 15:37:09 +10002628 int remote_id;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002629
Ben Lindstrome9c99912001-06-09 00:41:05 +00002630 remote_id = packet_get_int();
2631 host = packet_get_string(NULL);
2632 host_port = packet_get_int();
2633
2634 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2635 originator_string = packet_get_string(NULL);
2636 } else {
2637 originator_string = xstrdup("unknown (remote did not supply name)");
2638 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002639 packet_check_eom();
Damien Millerbd740252008-05-19 15:37:09 +10002640 c = channel_connect_to(host, host_port,
2641 "connected socket", originator_string);
Darren Tuckera627d422013-06-02 07:31:17 +10002642 free(originator_string);
2643 free(host);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002644 if (c == NULL) {
2645 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2646 packet_put_int(remote_id);
2647 packet_send();
Damien Millerbd740252008-05-19 15:37:09 +10002648 } else
2649 c->remote_id = remote_id;
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002650}
2651
Damien Millerb84886b2008-05-19 15:05:07 +10002652/* ARGSUSED */
2653void
2654channel_input_status_confirm(int type, u_int32_t seq, void *ctxt)
2655{
2656 Channel *c;
2657 struct channel_confirm *cc;
Damien Miller16a73072008-12-08 09:55:25 +11002658 int id;
Damien Millerb84886b2008-05-19 15:05:07 +10002659
2660 /* Reset keepalive timeout */
Darren Tuckerf7288d72009-06-21 18:12:20 +10002661 packet_set_alive_timeouts(0);
Damien Millerb84886b2008-05-19 15:05:07 +10002662
Damien Miller16a73072008-12-08 09:55:25 +11002663 id = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002664 packet_check_eom();
2665
Damien Miller16a73072008-12-08 09:55:25 +11002666 debug2("channel_input_status_confirm: type %d id %d", type, id);
Damien Millerb84886b2008-05-19 15:05:07 +10002667
Damien Miller16a73072008-12-08 09:55:25 +11002668 if ((c = channel_lookup(id)) == NULL) {
2669 logit("channel_input_status_confirm: %d: unknown", id);
Damien Millerb84886b2008-05-19 15:05:07 +10002670 return;
2671 }
2672 ;
2673 if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
2674 return;
2675 cc->cb(type, c, cc->ctx);
2676 TAILQ_REMOVE(&c->status_confirms, cc, entry);
Damien Miller1d2c4562014-02-04 11:18:20 +11002677 explicit_bzero(cc, sizeof(*cc));
Darren Tuckera627d422013-06-02 07:31:17 +10002678 free(cc);
Damien Millerb84886b2008-05-19 15:05:07 +10002679}
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002680
Ben Lindstrome9c99912001-06-09 00:41:05 +00002681/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002682
Ben Lindstrom908afed2001-10-03 17:34:59 +00002683void
2684channel_set_af(int af)
2685{
2686 IPv4or6 = af;
2687}
2688
Damien Millerf6dff7c2011-09-22 21:38:52 +10002689
2690/*
2691 * Determine whether or not a port forward listens to loopback, the
2692 * specified address or wildcard. On the client, a specified bind
2693 * address will always override gateway_ports. On the server, a
2694 * gateway_ports of 1 (``yes'') will override the client's specification
2695 * and force a wildcard bind, whereas a value of 2 (``clientspecified'')
2696 * will bind to whatever address the client asked for.
2697 *
2698 * Special-case listen_addrs are:
2699 *
2700 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2701 * "" (empty string), "*" -> wildcard v4/v6
2702 * "localhost" -> loopback v4/v6
2703 */
2704static const char *
2705channel_fwd_bind_addr(const char *listen_addr, int *wildcardp,
2706 int is_client, int gateway_ports)
2707{
2708 const char *addr = NULL;
2709 int wildcard = 0;
2710
2711 if (listen_addr == NULL) {
2712 /* No address specified: default to gateway_ports setting */
2713 if (gateway_ports)
2714 wildcard = 1;
2715 } else if (gateway_ports || is_client) {
2716 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
2717 strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
2718 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
Darren Tucker71152bc2013-10-10 10:27:21 +11002719 (!is_client && gateway_ports == 1)) {
Damien Millerf6dff7c2011-09-22 21:38:52 +10002720 wildcard = 1;
Darren Tucker71152bc2013-10-10 10:27:21 +11002721 /*
2722 * Notify client if they requested a specific listen
2723 * address and it was overridden.
2724 */
2725 if (*listen_addr != '\0' &&
2726 strcmp(listen_addr, "0.0.0.0") != 0 &&
2727 strcmp(listen_addr, "*") != 0) {
2728 packet_send_debug("Forwarding listen address "
2729 "\"%s\" overridden by server "
2730 "GatewayPorts", listen_addr);
2731 }
Damien Miller795b8632014-05-21 17:12:53 +10002732 }
Damien Millere84d1032014-05-21 17:13:36 +10002733 else if (strcmp(listen_addr, "localhost") != 0)
2734 addr = listen_addr;
Damien Millerf6dff7c2011-09-22 21:38:52 +10002735 }
2736 if (wildcardp != NULL)
2737 *wildcardp = wildcard;
2738 return addr;
2739}
2740
Damien Millerb16461c2002-01-22 23:29:22 +11002741static int
Damien Miller4bf648f2009-02-14 16:28:21 +11002742channel_setup_fwd_listener(int type, const char *listen_addr,
2743 u_short listen_port, int *allocated_listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002744 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002745{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002746 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002747 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002748 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002749 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002750 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller4bf648f2009-02-14 16:28:21 +11002751 in_port_t *lport_p;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002752
Damien Millerb16461c2002-01-22 23:29:22 +11002753 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2754 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002755 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002756
Damien Millerb16461c2002-01-22 23:29:22 +11002757 if (host == NULL) {
2758 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002759 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002760 }
Damien Miller9576ac42009-01-28 16:30:33 +11002761 if (strlen(host) >= NI_MAXHOST) {
Kevin Steves12057502001-02-05 14:54:34 +00002762 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002763 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002764 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002765
Damien Millerf6dff7c2011-09-22 21:38:52 +10002766 /* Determine the bind address, cf. channel_fwd_bind_addr() comment */
2767 addr = channel_fwd_bind_addr(listen_addr, &wildcard,
2768 is_client, gateway_ports);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002769 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2770 type, wildcard, (addr == NULL) ? "NULL" : addr);
2771
2772 /*
Damien Miller34132e52000-01-14 15:45:46 +11002773 * getaddrinfo returns a loopback address if the hostname is
2774 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002775 */
Damien Miller34132e52000-01-14 15:45:46 +11002776 memset(&hints, 0, sizeof(hints));
2777 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002778 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002779 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002780 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002781 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2782 if (addr == NULL) {
2783 /* This really shouldn't happen */
2784 packet_disconnect("getaddrinfo: fatal error: %s",
Darren Tucker4abde772007-12-29 02:43:51 +11002785 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002786 } else {
Damien Millera7270302005-07-06 09:36:05 +10002787 error("channel_setup_fwd_listener: "
Darren Tucker4abde772007-12-29 02:43:51 +11002788 "getaddrinfo(%.64s): %s", addr,
2789 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002790 }
Damien Millera7270302005-07-06 09:36:05 +10002791 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002792 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002793 if (allocated_listen_port != NULL)
2794 *allocated_listen_port = 0;
Damien Miller34132e52000-01-14 15:45:46 +11002795 for (ai = aitop; ai; ai = ai->ai_next) {
Damien Miller4bf648f2009-02-14 16:28:21 +11002796 switch (ai->ai_family) {
2797 case AF_INET:
2798 lport_p = &((struct sockaddr_in *)ai->ai_addr)->
2799 sin_port;
2800 break;
2801 case AF_INET6:
2802 lport_p = &((struct sockaddr_in6 *)ai->ai_addr)->
2803 sin6_port;
2804 break;
2805 default:
Damien Miller34132e52000-01-14 15:45:46 +11002806 continue;
Damien Miller4bf648f2009-02-14 16:28:21 +11002807 }
2808 /*
2809 * If allocating a port for -R forwards, then use the
2810 * same port for all address families.
2811 */
2812 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2813 allocated_listen_port != NULL && *allocated_listen_port > 0)
2814 *lport_p = htons(*allocated_listen_port);
2815
Damien Miller34132e52000-01-14 15:45:46 +11002816 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2817 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002818 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002819 continue;
2820 }
2821 /* Create a port to listen for the host. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11002822 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002823 if (sock < 0) {
2824 /* this is no error since kernel may not support ipv6 */
2825 verbose("socket: %.100s", strerror(errno));
2826 continue;
2827 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002828
2829 channel_set_reuseaddr(sock);
Damien Miller04ee0f82009-11-18 17:48:30 +11002830 if (ai->ai_family == AF_INET6)
2831 sock_set_v6only(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002832
Damien Miller4bf648f2009-02-14 16:28:21 +11002833 debug("Local forwarding listening on %s port %s.",
2834 ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002835
Damien Miller34132e52000-01-14 15:45:46 +11002836 /* Bind the socket to the address. */
2837 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2838 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002839 if (!ai->ai_next)
2840 error("bind: %.100s", strerror(errno));
2841 else
2842 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002843
Damien Miller34132e52000-01-14 15:45:46 +11002844 close(sock);
2845 continue;
2846 }
2847 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002848 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002849 error("listen: %.100s", strerror(errno));
2850 close(sock);
2851 continue;
2852 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002853
2854 /*
2855 * listen_port == 0 requests a dynamically allocated port -
2856 * record what we got.
2857 */
2858 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2859 allocated_listen_port != NULL &&
2860 *allocated_listen_port == 0) {
2861 *allocated_listen_port = get_sock_port(sock, 1);
2862 debug("Allocated listen port %d",
2863 *allocated_listen_port);
2864 }
2865
Damien Miller34132e52000-01-14 15:45:46 +11002866 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002867 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002868 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002869 0, "port listener", 1);
Damien Millera1c1b6c2009-01-28 16:29:49 +11002870 c->path = xstrdup(host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002871 c->host_port = port_to_connect;
Damien Millerf6dff7c2011-09-22 21:38:52 +10002872 c->listening_addr = addr == NULL ? NULL : xstrdup(addr);
Darren Tucker68afb8c2011-10-02 18:59:03 +11002873 if (listen_port == 0 && allocated_listen_port != NULL &&
2874 !(datafellows & SSH_BUG_DYNAMIC_RPORT))
2875 c->listening_port = *allocated_listen_port;
2876 else
2877 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002878 success = 1;
2879 }
2880 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002881 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002882 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002883 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002884 return success;
Damien Miller95def091999-11-25 00:26:21 +11002885}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002886
Darren Tuckere7066df2004-05-24 10:18:05 +10002887int
2888channel_cancel_rport_listener(const char *host, u_short port)
2889{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002890 u_int i;
2891 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002892
Darren Tucker47eede72005-03-14 23:08:12 +11002893 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002894 Channel *c = channels[i];
Damien Millerf6dff7c2011-09-22 21:38:52 +10002895 if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER)
2896 continue;
2897 if (strcmp(c->path, host) == 0 && c->listening_port == port) {
2898 debug2("%s: close channel %d", __func__, i);
2899 channel_free(c);
2900 found = 1;
2901 }
2902 }
Darren Tuckere7066df2004-05-24 10:18:05 +10002903
Damien Millerf6dff7c2011-09-22 21:38:52 +10002904 return (found);
2905}
2906
2907int
2908channel_cancel_lport_listener(const char *lhost, u_short lport,
Damien Millerff773642011-09-22 21:39:48 +10002909 int cport, int gateway_ports)
Damien Millerf6dff7c2011-09-22 21:38:52 +10002910{
2911 u_int i;
2912 int found = 0;
2913 const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, gateway_ports);
2914
2915 for (i = 0; i < channels_alloc; i++) {
2916 Channel *c = channels[i];
2917 if (c == NULL || c->type != SSH_CHANNEL_PORT_LISTENER)
2918 continue;
Damien Millerff773642011-09-22 21:39:48 +10002919 if (c->listening_port != lport)
Damien Millerf6dff7c2011-09-22 21:38:52 +10002920 continue;
Damien Millerff773642011-09-22 21:39:48 +10002921 if (cport == CHANNEL_CANCEL_PORT_STATIC) {
2922 /* skip dynamic forwardings */
2923 if (c->host_port == 0)
2924 continue;
2925 } else {
2926 if (c->host_port != cport)
2927 continue;
2928 }
Damien Millerf6dff7c2011-09-22 21:38:52 +10002929 if ((c->listening_addr == NULL && addr != NULL) ||
2930 (c->listening_addr != NULL && addr == NULL))
2931 continue;
2932 if (addr == NULL || strcmp(c->listening_addr, addr) == 0) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002933 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002934 channel_free(c);
2935 found = 1;
2936 }
2937 }
2938
2939 return (found);
2940}
2941
Damien Millerb16461c2002-01-22 23:29:22 +11002942/* protocol local port fwd, used by ssh (and sshd in v1) */
2943int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002944channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002945 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2946{
2947 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002948 listen_host, listen_port, NULL, host_to_connect, port_to_connect,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002949 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002950}
2951
2952/* protocol v2 remote port fwd, used by sshd */
2953int
2954channel_setup_remote_fwd_listener(const char *listen_address,
Damien Miller4bf648f2009-02-14 16:28:21 +11002955 u_short listen_port, int *allocated_listen_port, int gateway_ports)
Damien Millerb16461c2002-01-22 23:29:22 +11002956{
2957 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002958 listen_address, listen_port, allocated_listen_port,
2959 NULL, 0, gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002960}
2961
Damien Miller5428f641999-11-25 11:54:57 +11002962/*
Damien Millerf6dff7c2011-09-22 21:38:52 +10002963 * Translate the requested rfwd listen host to something usable for
2964 * this server.
2965 */
2966static const char *
2967channel_rfwd_bind_host(const char *listen_host)
2968{
2969 if (listen_host == NULL) {
2970 if (datafellows & SSH_BUG_RFWD_ADDR)
2971 return "127.0.0.1";
2972 else
2973 return "localhost";
2974 } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) {
2975 if (datafellows & SSH_BUG_RFWD_ADDR)
2976 return "0.0.0.0";
2977 else
2978 return "";
2979 } else
2980 return listen_host;
2981}
2982
2983/*
Damien Miller5428f641999-11-25 11:54:57 +11002984 * Initiate forwarding of connections to port "port" on remote host through
2985 * the secure channel to host:port from local side.
Darren Tucker68afb8c2011-10-02 18:59:03 +11002986 * Returns handle (index) for updating the dynamic listen port with
2987 * channel_update_permitted_opens().
Damien Miller5428f641999-11-25 11:54:57 +11002988 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10002989int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002990channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002991 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002992{
Darren Tucker68afb8c2011-10-02 18:59:03 +11002993 int type, success = 0, idx = -1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002994
Damien Miller95def091999-11-25 00:26:21 +11002995 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002996 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10002997 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2998 packet_put_cstring("tcpip-forward");
Damien Millerf6dff7c2011-09-22 21:38:52 +10002999 packet_put_char(1); /* boolean: want reply */
3000 packet_put_cstring(channel_rfwd_bind_host(listen_host));
Damien Miller33b13562000-04-04 14:38:59 +10003001 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11003002 packet_send();
3003 packet_write_wait();
3004 /* Assume that server accepts the request */
3005 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10003006 } else {
3007 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10003008 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10003009 packet_put_cstring(host_to_connect);
3010 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10003011 packet_send();
3012 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11003013
3014 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11003015 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11003016 switch (type) {
3017 case SSH_SMSG_SUCCESS:
3018 success = 1;
3019 break;
3020 case SSH_SMSG_FAILURE:
Damien Miller0bc1bd82000-11-13 22:57:25 +11003021 break;
3022 default:
3023 /* Unknown packet */
3024 packet_disconnect("Protocol error for port forward request:"
3025 "received packet type %d.", type);
3026 }
3027 }
3028 if (success) {
Damien Miller232cfb12010-06-26 09:50:30 +10003029 /* Record that connection to this host/port is permitted. */
3030 permitted_opens = xrealloc(permitted_opens,
3031 num_permitted_opens + 1, sizeof(*permitted_opens));
Darren Tucker68afb8c2011-10-02 18:59:03 +11003032 idx = num_permitted_opens++;
3033 permitted_opens[idx].host_to_connect = xstrdup(host_to_connect);
3034 permitted_opens[idx].port_to_connect = port_to_connect;
3035 permitted_opens[idx].listen_port = listen_port;
Damien Miller33b13562000-04-04 14:38:59 +10003036 }
Darren Tucker68afb8c2011-10-02 18:59:03 +11003037 return (idx);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003038}
3039
Damien Miller5428f641999-11-25 11:54:57 +11003040/*
Darren Tuckerfc959702004-07-17 16:12:08 +10003041 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10003042 * local side.
3043 */
Damien Millerf6dff7c2011-09-22 21:38:52 +10003044int
Damien Millerf91ee4c2005-03-01 21:24:33 +11003045channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10003046{
3047 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10003048
3049 if (!compat20)
Damien Millerf6dff7c2011-09-22 21:38:52 +10003050 return -1;
Darren Tuckere7066df2004-05-24 10:18:05 +10003051
3052 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10003053 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10003054 permitted_opens[i].listen_port == port)
3055 break;
3056 }
3057 if (i >= num_permitted_opens) {
3058 debug("%s: requested forward not found", __func__);
Damien Millerf6dff7c2011-09-22 21:38:52 +10003059 return -1;
Darren Tuckere7066df2004-05-24 10:18:05 +10003060 }
3061 packet_start(SSH2_MSG_GLOBAL_REQUEST);
3062 packet_put_cstring("cancel-tcpip-forward");
3063 packet_put_char(0);
Damien Millerf6dff7c2011-09-22 21:38:52 +10003064 packet_put_cstring(channel_rfwd_bind_host(host));
Darren Tuckere7066df2004-05-24 10:18:05 +10003065 packet_put_int(port);
3066 packet_send();
3067
3068 permitted_opens[i].listen_port = 0;
3069 permitted_opens[i].port_to_connect = 0;
Darren Tuckera627d422013-06-02 07:31:17 +10003070 free(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10003071 permitted_opens[i].host_to_connect = NULL;
Damien Millerf6dff7c2011-09-22 21:38:52 +10003072
3073 return 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10003074}
3075
3076/*
Damien Miller5428f641999-11-25 11:54:57 +11003077 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
3078 * listening for the port, and sends back a success reply (or disconnect
Darren Tuckere7d4b192006-07-12 22:17:10 +10003079 * message if there was an error).
Damien Miller5428f641999-11-25 11:54:57 +11003080 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10003081int
Damien Millere247cc42000-05-07 12:03:14 +10003082channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003083{
Damien Milleraae6c611999-12-06 11:47:28 +11003084 u_short port, host_port;
Darren Tuckere7d4b192006-07-12 22:17:10 +10003085 int success = 0;
Damien Miller95def091999-11-25 00:26:21 +11003086 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003087
Damien Miller95def091999-11-25 00:26:21 +11003088 /* Get arguments from the packet. */
3089 port = packet_get_int();
3090 hostname = packet_get_string(NULL);
3091 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003092
Damien Millerbac2d8a2000-09-05 16:13:06 +11003093#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11003094 /*
3095 * Check that an unprivileged user is not trying to forward a
3096 * privileged port.
3097 */
Damien Miller95def091999-11-25 00:26:21 +11003098 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10003099 packet_disconnect(
3100 "Requested forwarding of port %d but user is not root.",
3101 port);
3102 if (host_port == 0)
3103 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11003104#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10003105
Damien Miller0bc1bd82000-11-13 22:57:25 +11003106 /* Initiate forwarding */
Darren Tuckere7d4b192006-07-12 22:17:10 +10003107 success = channel_setup_local_fwd_listener(NULL, port, hostname,
Damien Millerf91ee4c2005-03-01 21:24:33 +11003108 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11003109
3110 /* Free the argument string. */
Darren Tuckera627d422013-06-02 07:31:17 +10003111 free(hostname);
Darren Tuckere7d4b192006-07-12 22:17:10 +10003112
3113 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003114}
3115
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003116/*
3117 * Permits opening to any host/port if permitted_opens[] is empty. This is
3118 * usually called by the server, because the user could connect to any port
3119 * anyway, and the server has no way to know but to trust the client anyway.
3120 */
3121void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003122channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003123{
3124 if (num_permitted_opens == 0)
3125 all_opens_permitted = 1;
3126}
3127
Ben Lindstroma3700052001-04-05 23:26:32 +00003128void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003129channel_add_permitted_opens(char *host, int port)
3130{
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003131 debug("allow port forwarding to host %s port %d", host, port);
3132
Damien Miller232cfb12010-06-26 09:50:30 +10003133 permitted_opens = xrealloc(permitted_opens,
3134 num_permitted_opens + 1, sizeof(*permitted_opens));
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003135 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
3136 permitted_opens[num_permitted_opens].port_to_connect = port;
3137 num_permitted_opens++;
3138
3139 all_opens_permitted = 0;
3140}
3141
Darren Tucker68afb8c2011-10-02 18:59:03 +11003142/*
3143 * Update the listen port for a dynamic remote forward, after
3144 * the actual 'newport' has been allocated. If 'newport' < 0 is
3145 * passed then they entry will be invalidated.
3146 */
3147void
3148channel_update_permitted_opens(int idx, int newport)
3149{
3150 if (idx < 0 || idx >= num_permitted_opens) {
3151 debug("channel_update_permitted_opens: index out of range:"
3152 " %d num_permitted_opens %d", idx, num_permitted_opens);
3153 return;
3154 }
3155 debug("%s allowed port %d for forwarding to host %s port %d",
3156 newport > 0 ? "Updating" : "Removing",
3157 newport,
3158 permitted_opens[idx].host_to_connect,
3159 permitted_opens[idx].port_to_connect);
3160 if (newport >= 0) {
3161 permitted_opens[idx].listen_port =
3162 (datafellows & SSH_BUG_DYNAMIC_RPORT) ? 0 : newport;
3163 } else {
3164 permitted_opens[idx].listen_port = 0;
3165 permitted_opens[idx].port_to_connect = 0;
Darren Tuckera627d422013-06-02 07:31:17 +10003166 free(permitted_opens[idx].host_to_connect);
Darren Tucker68afb8c2011-10-02 18:59:03 +11003167 permitted_opens[idx].host_to_connect = NULL;
3168 }
3169}
3170
Damien Millera765cf42006-07-24 14:08:13 +10003171int
Damien Miller9b439df2006-07-24 14:04:00 +10003172channel_add_adm_permitted_opens(char *host, int port)
3173{
Damien Millera765cf42006-07-24 14:08:13 +10003174 debug("config allows port forwarding to host %s port %d", host, port);
Damien Miller9b439df2006-07-24 14:04:00 +10003175
Damien Miller232cfb12010-06-26 09:50:30 +10003176 permitted_adm_opens = xrealloc(permitted_adm_opens,
3177 num_adm_permitted_opens + 1, sizeof(*permitted_adm_opens));
Damien Miller9b439df2006-07-24 14:04:00 +10003178 permitted_adm_opens[num_adm_permitted_opens].host_to_connect
3179 = xstrdup(host);
3180 permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
Damien Millera765cf42006-07-24 14:08:13 +10003181 return ++num_adm_permitted_opens;
Damien Miller9b439df2006-07-24 14:04:00 +10003182}
3183
3184void
Damien Millerc6081482012-04-22 11:18:53 +10003185channel_disable_adm_local_opens(void)
3186{
Damien Milleraa5b3f82012-12-03 09:50:54 +11003187 channel_clear_adm_permitted_opens();
3188 permitted_adm_opens = xmalloc(sizeof(*permitted_adm_opens));
3189 permitted_adm_opens[num_adm_permitted_opens].host_to_connect = NULL;
3190 num_adm_permitted_opens = 1;
Damien Millerc6081482012-04-22 11:18:53 +10003191}
3192
3193void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003194channel_clear_permitted_opens(void)
3195{
3196 int i;
3197
3198 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckera627d422013-06-02 07:31:17 +10003199 free(permitted_opens[i].host_to_connect);
3200 free(permitted_opens);
3201 permitted_opens = NULL;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003202 num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +10003203}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003204
Damien Miller9b439df2006-07-24 14:04:00 +10003205void
3206channel_clear_adm_permitted_opens(void)
3207{
3208 int i;
3209
3210 for (i = 0; i < num_adm_permitted_opens; i++)
Darren Tuckera627d422013-06-02 07:31:17 +10003211 free(permitted_adm_opens[i].host_to_connect);
3212 free(permitted_adm_opens);
3213 permitted_adm_opens = NULL;
Damien Miller9b439df2006-07-24 14:04:00 +10003214 num_adm_permitted_opens = 0;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003215}
3216
Darren Tuckere7140f22008-06-10 23:01:51 +10003217void
3218channel_print_adm_permitted_opens(void)
3219{
Damien Miller6ef17492008-07-16 22:42:06 +10003220 int i;
Darren Tuckere7140f22008-06-10 23:01:51 +10003221
Damien Millerb53d8a12009-01-28 16:13:04 +11003222 printf("permitopen");
Darren Tucker22662e82008-11-11 16:40:22 +11003223 if (num_adm_permitted_opens == 0) {
Damien Millerb53d8a12009-01-28 16:13:04 +11003224 printf(" any\n");
Darren Tucker22662e82008-11-11 16:40:22 +11003225 return;
3226 }
Darren Tuckere7140f22008-06-10 23:01:51 +10003227 for (i = 0; i < num_adm_permitted_opens; i++)
Damien Millerc6081482012-04-22 11:18:53 +10003228 if (permitted_adm_opens[i].host_to_connect == NULL)
3229 printf(" none");
3230 else
Darren Tuckere7140f22008-06-10 23:01:51 +10003231 printf(" %s:%d", permitted_adm_opens[i].host_to_connect,
3232 permitted_adm_opens[i].port_to_connect);
Damien Millerb53d8a12009-01-28 16:13:04 +11003233 printf("\n");
Darren Tuckere7140f22008-06-10 23:01:51 +10003234}
3235
Darren Tucker1338b9e2011-10-02 18:57:35 +11003236/* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */
3237int
3238permitopen_port(const char *p)
3239{
3240 int port;
3241
3242 if (strcmp(p, "*") == 0)
3243 return FWD_PERMIT_ANY_PORT;
3244 if ((port = a2port(p)) > 0)
3245 return port;
3246 return -1;
3247}
3248
3249static int
3250port_match(u_short allowedport, u_short requestedport)
3251{
3252 if (allowedport == FWD_PERMIT_ANY_PORT ||
3253 allowedport == requestedport)
3254 return 1;
3255 return 0;
3256}
3257
Damien Millerbd740252008-05-19 15:37:09 +10003258/* Try to start non-blocking connect to next host in cctx list */
Ben Lindstrombba81212001-06-25 05:01:22 +00003259static int
Damien Millerbd740252008-05-19 15:37:09 +10003260connect_next(struct channel_connect *cctx)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003261{
Damien Millerbd740252008-05-19 15:37:09 +10003262 int sock, saved_errno;
Damien Miller34132e52000-01-14 15:45:46 +11003263 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller95def091999-11-25 00:26:21 +11003264
Damien Millerbd740252008-05-19 15:37:09 +10003265 for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
3266 if (cctx->ai->ai_family != AF_INET &&
3267 cctx->ai->ai_family != AF_INET6)
Damien Miller34132e52000-01-14 15:45:46 +11003268 continue;
Damien Millerbd740252008-05-19 15:37:09 +10003269 if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
3270 ntop, sizeof(ntop), strport, sizeof(strport),
3271 NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
3272 error("connect_next: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11003273 continue;
3274 }
Darren Tucker7bd98e72010-01-10 10:31:12 +11003275 if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
3276 cctx->ai->ai_protocol)) == -1) {
Damien Millerbd740252008-05-19 15:37:09 +10003277 if (cctx->ai->ai_next == NULL)
Damien Millerb46b9f32003-01-10 21:45:12 +11003278 error("socket: %.100s", strerror(errno));
3279 else
3280 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003281 continue;
3282 }
Damien Miller232711f2004-06-15 10:35:30 +10003283 if (set_nonblock(sock) == -1)
3284 fatal("%s: set_nonblock(%d)", __func__, sock);
Damien Millerbd740252008-05-19 15:37:09 +10003285 if (connect(sock, cctx->ai->ai_addr,
3286 cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
3287 debug("connect_next: host %.100s ([%.100s]:%s): "
3288 "%.100s", cctx->host, ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11003289 strerror(errno));
Damien Millerbd740252008-05-19 15:37:09 +10003290 saved_errno = errno;
Damien Miller34132e52000-01-14 15:45:46 +11003291 close(sock);
Damien Millerbd740252008-05-19 15:37:09 +10003292 errno = saved_errno;
Kevin Stevesef4eea92001-02-05 12:42:17 +00003293 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11003294 }
Damien Millerbd740252008-05-19 15:37:09 +10003295 debug("connect_next: host %.100s ([%.100s]:%s) "
3296 "in progress, fd=%d", cctx->host, ntop, strport, sock);
3297 cctx->ai = cctx->ai->ai_next;
3298 set_nodelay(sock);
3299 return sock;
Damien Miller34132e52000-01-14 15:45:46 +11003300 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11003301 return -1;
3302}
Damien Millerb38eff82000-04-01 11:09:21 +10003303
Damien Millerbd740252008-05-19 15:37:09 +10003304static void
3305channel_connect_ctx_free(struct channel_connect *cctx)
3306{
Darren Tuckera627d422013-06-02 07:31:17 +10003307 free(cctx->host);
Damien Millerbd740252008-05-19 15:37:09 +10003308 if (cctx->aitop)
3309 freeaddrinfo(cctx->aitop);
Damien Miller1d2c4562014-02-04 11:18:20 +11003310 memset(cctx, 0, sizeof(*cctx));
Damien Millerbd740252008-05-19 15:37:09 +10003311}
3312
3313/* Return CONNECTING channel to remote host, port */
3314static Channel *
3315connect_to(const char *host, u_short port, char *ctype, char *rname)
3316{
3317 struct addrinfo hints;
3318 int gaierr;
3319 int sock = -1;
3320 char strport[NI_MAXSERV];
3321 struct channel_connect cctx;
3322 Channel *c;
3323
Damien Miller2bcb8662008-07-12 17:12:29 +10003324 memset(&cctx, 0, sizeof(cctx));
Damien Millerbd740252008-05-19 15:37:09 +10003325 memset(&hints, 0, sizeof(hints));
3326 hints.ai_family = IPv4or6;
3327 hints.ai_socktype = SOCK_STREAM;
3328 snprintf(strport, sizeof strport, "%d", port);
3329 if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) {
3330 error("connect_to %.100s: unknown host (%s)", host,
3331 ssh_gai_strerror(gaierr));
3332 return NULL;
3333 }
3334
3335 cctx.host = xstrdup(host);
3336 cctx.port = port;
3337 cctx.ai = cctx.aitop;
3338
3339 if ((sock = connect_next(&cctx)) == -1) {
3340 error("connect to %.100s port %d failed: %s",
3341 host, port, strerror(errno));
3342 channel_connect_ctx_free(&cctx);
3343 return NULL;
3344 }
3345 c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
3346 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
3347 c->connect_ctx = cctx;
3348 return c;
3349}
3350
3351Channel *
3352channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname)
3353{
3354 int i;
3355
3356 for (i = 0; i < num_permitted_opens; i++) {
3357 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tucker1338b9e2011-10-02 18:57:35 +11003358 port_match(permitted_opens[i].listen_port, listen_port)) {
Damien Millerbd740252008-05-19 15:37:09 +10003359 return connect_to(
3360 permitted_opens[i].host_to_connect,
3361 permitted_opens[i].port_to_connect, ctype, rname);
3362 }
3363 }
3364 error("WARNING: Server requests forwarding for unknown listen_port %d",
3365 listen_port);
3366 return NULL;
3367}
3368
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003369/* Check if connecting to that port is permitted and connect. */
Damien Millerbd740252008-05-19 15:37:09 +10003370Channel *
3371channel_connect_to(const char *host, u_short port, char *ctype, char *rname)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003372{
Damien Miller9b439df2006-07-24 14:04:00 +10003373 int i, permit, permit_adm = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003374
3375 permit = all_opens_permitted;
3376 if (!permit) {
3377 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10003378 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tucker1338b9e2011-10-02 18:57:35 +11003379 port_match(permitted_opens[i].port_to_connect, port) &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003380 strcmp(permitted_opens[i].host_to_connect, host) == 0)
3381 permit = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003382 }
Damien Miller9b439df2006-07-24 14:04:00 +10003383
3384 if (num_adm_permitted_opens > 0) {
3385 permit_adm = 0;
3386 for (i = 0; i < num_adm_permitted_opens; i++)
3387 if (permitted_adm_opens[i].host_to_connect != NULL &&
Darren Tucker1338b9e2011-10-02 18:57:35 +11003388 port_match(permitted_adm_opens[i].port_to_connect, port) &&
Damien Miller9b439df2006-07-24 14:04:00 +10003389 strcmp(permitted_adm_opens[i].host_to_connect, host)
3390 == 0)
3391 permit_adm = 1;
3392 }
3393
3394 if (!permit || !permit_adm) {
Damien Miller996acd22003-04-09 20:59:48 +10003395 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003396 "but the request was denied.", host, port);
Damien Millerbd740252008-05-19 15:37:09 +10003397 return NULL;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003398 }
Damien Millerbd740252008-05-19 15:37:09 +10003399 return connect_to(host, port, ctype, rname);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003400}
3401
Damien Miller0e220db2004-06-15 10:34:08 +10003402void
3403channel_send_window_changes(void)
3404{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10003405 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10003406 struct winsize ws;
3407
3408 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11003409 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10003410 channels[i]->type != SSH_CHANNEL_OPEN)
3411 continue;
3412 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
3413 continue;
3414 channel_request_start(i, "window-change", 0);
Damien Miller71a73672006-03-26 14:04:36 +11003415 packet_put_int((u_int)ws.ws_col);
3416 packet_put_int((u_int)ws.ws_row);
3417 packet_put_int((u_int)ws.ws_xpixel);
3418 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10003419 packet_send();
3420 }
3421}
3422
Ben Lindstrome9c99912001-06-09 00:41:05 +00003423/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003424
Damien Miller5428f641999-11-25 11:54:57 +11003425/*
3426 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003427 * Returns 0 and a suitable display number for the DISPLAY variable
3428 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11003429 */
Kevin Steves366298c2001-12-19 17:58:01 +00003430int
Damien Miller95c249f2002-02-05 12:11:34 +11003431x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10003432 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003433{
Damien Millere7378562001-12-21 14:58:35 +11003434 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11003435 int display_number, sock;
3436 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11003437 struct addrinfo hints, *ai, *aitop;
3438 char strport[NI_MAXSERV];
3439 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003440
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003441 if (chanids == NULL)
3442 return -1;
3443
Damien Millera34a28b1999-12-14 10:47:15 +11003444 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11003445 display_number < MAX_DISPLAYS;
3446 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11003447 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11003448 memset(&hints, 0, sizeof(hints));
3449 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11003450 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11003451 hints.ai_socktype = SOCK_STREAM;
3452 snprintf(strport, sizeof strport, "%d", port);
3453 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003454 error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00003455 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003456 }
Damien Miller34132e52000-01-14 15:45:46 +11003457 for (ai = aitop; ai; ai = ai->ai_next) {
3458 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
3459 continue;
Darren Tucker7bd98e72010-01-10 10:31:12 +11003460 sock = socket(ai->ai_family, ai->ai_socktype,
3461 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003462 if (sock < 0) {
Damien Miller6480c632010-03-26 11:09:44 +11003463 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)
3464#ifdef EPFNOSUPPORT
3465 && (errno != EPFNOSUPPORT)
3466#endif
3467 ) {
Damien Millere2192732000-01-17 13:22:55 +11003468 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10003469 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00003470 return -1;
Damien Millere2192732000-01-17 13:22:55 +11003471 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11003472 debug("x11_create_display_inet: Socket family %d not supported",
3473 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11003474 continue;
3475 }
Damien Miller34132e52000-01-14 15:45:46 +11003476 }
Damien Miller04ee0f82009-11-18 17:48:30 +11003477 if (ai->ai_family == AF_INET6)
3478 sock_set_v6only(sock);
Damien Miller4401e452008-06-12 06:05:12 +10003479 if (x11_use_localhost)
3480 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11003481 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003482 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003483 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11003484
Damien Miller34132e52000-01-14 15:45:46 +11003485 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11003486 close(socks[n]);
3487 }
3488 num_socks = 0;
3489 break;
3490 }
3491 socks[num_socks++] = sock;
3492 if (num_socks == NUM_SOCKS)
3493 break;
Damien Miller95def091999-11-25 00:26:21 +11003494 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00003495 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11003496 if (num_socks > 0)
3497 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003498 }
Damien Miller95def091999-11-25 00:26:21 +11003499 if (display_number >= MAX_DISPLAYS) {
3500 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00003501 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003502 }
Damien Miller95def091999-11-25 00:26:21 +11003503 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11003504 for (n = 0; n < num_socks; n++) {
3505 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11003506 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11003507 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003508 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00003509 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11003510 }
Damien Miller95def091999-11-25 00:26:21 +11003511 }
Damien Miller34132e52000-01-14 15:45:46 +11003512
Damien Miller34132e52000-01-14 15:45:46 +11003513 /* Allocate a channel for each socket. */
Damien Miller07d86be2006-03-26 14:19:21 +11003514 *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
Damien Miller34132e52000-01-14 15:45:46 +11003515 for (n = 0; n < num_socks; n++) {
3516 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11003517 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10003518 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
3519 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003520 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11003521 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003522 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11003523 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003524 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003525
Kevin Steves366298c2001-12-19 17:58:01 +00003526 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003527 *display_numberp = display_number;
3528 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003529}
3530
Ben Lindstrombba81212001-06-25 05:01:22 +00003531static int
Damien Miller819dbb62009-01-21 16:46:26 +11003532connect_local_xsocket_path(const char *pathname)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003533{
Damien Miller95def091999-11-25 00:26:21 +11003534 int sock;
3535 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003536
Damien Miller3afe3752001-12-21 12:39:51 +11003537 sock = socket(AF_UNIX, SOCK_STREAM, 0);
3538 if (sock < 0)
3539 error("socket: %.100s", strerror(errno));
3540 memset(&addr, 0, sizeof(addr));
3541 addr.sun_family = AF_UNIX;
Damien Miller819dbb62009-01-21 16:46:26 +11003542 strlcpy(addr.sun_path, pathname, sizeof addr.sun_path);
Damien Miller90967402006-03-26 14:07:26 +11003543 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
Damien Miller3afe3752001-12-21 12:39:51 +11003544 return sock;
3545 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11003546 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
3547 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003548}
3549
Damien Miller819dbb62009-01-21 16:46:26 +11003550static int
3551connect_local_xsocket(u_int dnr)
3552{
3553 char buf[1024];
3554 snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr);
3555 return connect_local_xsocket_path(buf);
3556}
3557
Damien Millerbd483e72000-04-30 10:00:53 +10003558int
3559x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003560{
Damien Miller57c4e872006-03-31 23:11:07 +11003561 u_int display_number;
Damien Miller95def091999-11-25 00:26:21 +11003562 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10003563 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11003564 struct addrinfo hints, *ai, *aitop;
3565 char strport[NI_MAXSERV];
Damien Miller57c4e872006-03-31 23:11:07 +11003566 int gaierr, sock = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003567
Damien Miller95def091999-11-25 00:26:21 +11003568 /* Try to open a socket for the local X server. */
3569 display = getenv("DISPLAY");
3570 if (!display) {
3571 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10003572 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003573 }
Damien Miller5428f641999-11-25 11:54:57 +11003574 /*
3575 * Now we decode the value of the DISPLAY variable and make a
3576 * connection to the real X server.
3577 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003578
Damien Miller819dbb62009-01-21 16:46:26 +11003579 /* Check if the display is from launchd. */
3580#ifdef __APPLE__
3581 if (strncmp(display, "/tmp/launch", 11) == 0) {
3582 sock = connect_local_xsocket_path(display);
3583 if (sock < 0)
3584 return -1;
3585
3586 /* OK, we now have a connection to the display. */
3587 return sock;
3588 }
3589#endif
Damien Miller5428f641999-11-25 11:54:57 +11003590 /*
3591 * Check if it is a unix domain socket. Unix domain displays are in
3592 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
3593 */
Damien Miller95def091999-11-25 00:26:21 +11003594 if (strncmp(display, "unix:", 5) == 0 ||
3595 display[0] == ':') {
3596 /* Connect to the unix domain socket. */
Damien Miller57c4e872006-03-31 23:11:07 +11003597 if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003598 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003599 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003600 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003601 }
3602 /* Create a socket. */
3603 sock = connect_local_xsocket(display_number);
3604 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10003605 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003606
3607 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10003608 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003609 }
Damien Miller5428f641999-11-25 11:54:57 +11003610 /*
3611 * Connect to an inet socket. The DISPLAY value is supposedly
3612 * hostname:d[.s], where hostname may also be numeric IP address.
3613 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00003614 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11003615 cp = strchr(buf, ':');
3616 if (!cp) {
3617 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10003618 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003619 }
Damien Miller95def091999-11-25 00:26:21 +11003620 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11003621 /* buf now contains the host name. But first we parse the display number. */
Damien Miller57c4e872006-03-31 23:11:07 +11003622 if (sscanf(cp + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003623 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003624 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003625 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003626 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003627
Damien Miller34132e52000-01-14 15:45:46 +11003628 /* Look up the host address */
3629 memset(&hints, 0, sizeof(hints));
3630 hints.ai_family = IPv4or6;
3631 hints.ai_socktype = SOCK_STREAM;
Damien Miller57c4e872006-03-31 23:11:07 +11003632 snprintf(strport, sizeof strport, "%u", 6000 + display_number);
Damien Miller34132e52000-01-14 15:45:46 +11003633 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003634 error("%.100s: unknown host. (%s)", buf,
3635 ssh_gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10003636 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003637 }
Damien Miller34132e52000-01-14 15:45:46 +11003638 for (ai = aitop; ai; ai = ai->ai_next) {
3639 /* Create a socket. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11003640 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003641 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003642 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10003643 continue;
3644 }
3645 /* Connect it to the display. */
3646 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Miller57c4e872006-03-31 23:11:07 +11003647 debug2("connect %.100s port %u: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10003648 6000 + display_number, strerror(errno));
3649 close(sock);
3650 continue;
3651 }
3652 /* Success */
3653 break;
Damien Miller34132e52000-01-14 15:45:46 +11003654 }
Damien Miller34132e52000-01-14 15:45:46 +11003655 freeaddrinfo(aitop);
3656 if (!ai) {
Damien Miller57c4e872006-03-31 23:11:07 +11003657 error("connect %.100s port %u: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11003658 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10003659 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003660 }
Damien Miller398e1cf2002-02-05 11:52:13 +11003661 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10003662 return sock;
3663}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003664
Damien Millerbd483e72000-04-30 10:00:53 +10003665/*
3666 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
3667 * the remote channel number. We should do whatever we want, and respond
3668 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
3669 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003670
Damien Miller8473dd82006-07-24 14:08:32 +10003671/* ARGSUSED */
Damien Millerbd483e72000-04-30 10:00:53 +10003672void
Damien Miller630d6f42002-01-22 23:17:30 +11003673x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10003674{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003675 Channel *c = NULL;
3676 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10003677 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10003678
3679 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003680
3681 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00003682
3683 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003684 remote_host = packet_get_string(NULL);
3685 } else {
3686 remote_host = xstrdup("unknown (remote did not supply name)");
3687 }
Damien Miller48b03fc2002-01-22 23:11:40 +11003688 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10003689
3690 /* Obtain a connection to the real X display. */
3691 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003692 if (sock != -1) {
3693 /* Allocate a channel for this connection. */
3694 c = channel_new("connected x11 socket",
3695 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3696 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11003697 c->remote_id = remote_id;
3698 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003699 }
Darren Tuckera627d422013-06-02 07:31:17 +10003700 free(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003701 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10003702 /* Send refusal to the remote host. */
3703 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003704 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10003705 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10003706 /* Send a confirmation to the remote host. */
3707 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003708 packet_put_int(remote_id);
3709 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10003710 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003711 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003712}
3713
Damien Miller69b69aa2000-10-28 14:19:58 +11003714/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
Damien Miller8473dd82006-07-24 14:08:32 +10003715/* ARGSUSED */
Damien Miller69b69aa2000-10-28 14:19:58 +11003716void
Damien Miller630d6f42002-01-22 23:17:30 +11003717deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11003718{
3719 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00003720
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00003721 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11003722 case SSH_SMSG_AGENT_OPEN:
3723 error("Warning: ssh server tried agent forwarding.");
3724 break;
3725 case SSH_SMSG_X11_OPEN:
3726 error("Warning: ssh server tried X11 forwarding.");
3727 break;
3728 default:
Damien Miller630d6f42002-01-22 23:17:30 +11003729 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11003730 break;
3731 }
Damien Miller5eb137c2005-12-31 16:19:53 +11003732 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11003733 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3734 packet_put_int(rchan);
3735 packet_send();
3736}
3737
Damien Miller5428f641999-11-25 11:54:57 +11003738/*
3739 * Requests forwarding of X11 connections, generates fake authentication
3740 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00003741 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11003742 */
Damien Miller4af51302000-04-16 11:18:38 +10003743void
Damien Miller17e7ed02005-06-17 12:54:33 +10003744x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Miller6d7b4372011-06-23 08:31:57 +10003745 const char *proto, const char *data, int want_reply)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003746{
Ben Lindstrom46c16222000-12-22 01:43:59 +00003747 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10003748 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11003749 char *new_data;
3750 int screen_number;
3751 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10003752 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003753
Damien Millerf92c0792005-07-06 09:45:26 +10003754 if (x11_saved_display == NULL)
3755 x11_saved_display = xstrdup(disp);
3756 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10003757 error("x11_request_forwarding_with_spoofing: different "
3758 "$DISPLAY already forwarded");
3759 return;
3760 }
3761
Damien Millerd5fe0ba2006-08-30 11:07:39 +10003762 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11003763 if (cp)
3764 cp = strchr(cp, '.');
3765 if (cp)
Damien Miller08d61502006-03-26 14:28:32 +11003766 screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
Damien Miller95def091999-11-25 00:26:21 +11003767 else
3768 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003769
Damien Miller13390022005-07-06 09:44:19 +10003770 if (x11_saved_proto == NULL) {
3771 /* Save protocol name. */
3772 x11_saved_proto = xstrdup(proto);
3773 /*
Damien Miller46d38de2005-07-17 17:02:09 +10003774 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10003775 * of the same length.
3776 */
3777 x11_saved_data = xmalloc(data_len);
3778 x11_fake_data = xmalloc(data_len);
3779 for (i = 0; i < data_len; i++) {
3780 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3781 fatal("x11_request_forwarding: bad "
3782 "authentication data: %.100s", data);
3783 if (i % 4 == 0)
3784 rnd = arc4random();
3785 x11_saved_data[i] = value;
3786 x11_fake_data[i] = rnd & 0xff;
3787 rnd >>= 8;
3788 }
3789 x11_saved_data_len = data_len;
3790 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003791 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003792
Damien Miller95def091999-11-25 00:26:21 +11003793 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003794 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003795
Damien Miller95def091999-11-25 00:26:21 +11003796 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003797 if (compat20) {
Damien Miller6d7b4372011-06-23 08:31:57 +10003798 channel_request_start(client_session_id, "x11-req", want_reply);
Damien Millerbd483e72000-04-30 10:00:53 +10003799 packet_put_char(0); /* XXX bool single connection */
3800 } else {
3801 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3802 }
3803 packet_put_cstring(proto);
3804 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003805 packet_put_int(screen_number);
3806 packet_send();
3807 packet_write_wait();
Darren Tuckera627d422013-06-02 07:31:17 +10003808 free(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003809}
3810
Ben Lindstrome9c99912001-06-09 00:41:05 +00003811
3812/* -- agent forwarding */
3813
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003814/* Sends a message to the server to request authentication fd forwarding. */
3815
Damien Miller4af51302000-04-16 11:18:38 +10003816void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003817auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003818{
Damien Miller95def091999-11-25 00:26:21 +11003819 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3820 packet_send();
3821 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003822}