blob: 25ebe1294e4e27ffe1238f79cdd5a99571ebf6ed [file] [log] [blame]
Darren Tucker4abde772007-12-29 02:43:51 +11001/* $OpenBSD: channels.c,v 1.271 2007/12/27 14:22:08 dtucker Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * This file contains functions for generic socket connection forwarding.
7 * There is also code for initiating connection forwarding for X11 connections,
8 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10009 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
Damien Miller33b13562000-04-04 14:38:59 +100016 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110017 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 * Copyright (c) 1999 Dug Song. All rights reserved.
19 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110040 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110043
Damien Miller574c41f2006-03-15 11:40:10 +110044#include <sys/types.h>
Damien Millerd7834352006-08-05 12:39:39 +100045#include <sys/ioctl.h>
Damien Miller574c41f2006-03-15 11:40:10 +110046#include <sys/un.h>
Damien Millerefc04e72006-07-10 20:26:27 +100047#include <sys/socket.h>
Damien Miller9aec9192006-08-05 10:57:45 +100048#ifdef HAVE_SYS_TIME_H
49# include <sys/time.h>
50#endif
Damien Millerefc04e72006-07-10 20:26:27 +100051
52#include <netinet/in.h>
53#include <arpa/inet.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110054
Darren Tucker39972492006-07-12 22:22:46 +100055#include <errno.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100056#include <netdb.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100057#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100058#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100059#include <string.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110060#include <termios.h>
Damien Millere6b3b612006-07-24 14:01:23 +100061#include <unistd.h>
Damien Millerd7834352006-08-05 12:39:39 +100062#include <stdarg.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100063
Damien Millerd7834352006-08-05 12:39:39 +100064#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100065#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000066#include "ssh1.h"
67#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100068#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000069#include "log.h"
70#include "misc.h"
Damien Millerd7834352006-08-05 12:39:39 +100071#include "buffer.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100072#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100073#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000074#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100075#include "key.h"
76#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110077#include "pathnames.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100078
Ben Lindstrome9c99912001-06-09 00:41:05 +000079/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080
Damien Miller5428f641999-11-25 11:54:57 +110081/*
82 * Pointer to an array containing all allocated channels. The array is
83 * dynamically extended as needed.
84 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000085static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086
Damien Miller5428f641999-11-25 11:54:57 +110087/*
88 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000089 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110090 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100091static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092
Damien Miller5428f641999-11-25 11:54:57 +110093/*
94 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000095 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110096 */
Damien Miller5e953212001-01-30 09:14:00 +110097static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100098
Damien Millerd4a8b7e1999-10-27 13:42:43 +100099
Ben Lindstrome9c99912001-06-09 00:41:05 +0000100/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000101
Damien Miller5428f641999-11-25 11:54:57 +1100102/*
103 * Data structure for storing which hosts are permitted for forward requests.
104 * The local sides of any remote forwards are stored in this array to prevent
105 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
106 * network (which might be behind a firewall).
107 */
Damien Miller95def091999-11-25 00:26:21 +1100108typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +1000109 char *host_to_connect; /* Connect to 'host'. */
110 u_short port_to_connect; /* Connect to 'port'. */
111 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000112} ForwardPermission;
113
Damien Miller9b439df2006-07-24 14:04:00 +1000114/* List of all permitted host/port pairs to connect by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000115static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +0000116
Damien Miller9b439df2006-07-24 14:04:00 +1000117/* List of all permitted host/port pairs to connect by the admin. */
118static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
119
120/* Number of permitted host/port pairs in the array permitted by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000121static int num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +1000122
123/* Number of permitted host/port pair in the array permitted by the admin. */
124static int num_adm_permitted_opens = 0;
125
Damien Miller5428f641999-11-25 11:54:57 +1100126/*
127 * If this is true, all opens are permitted. This is the case on the server
128 * on which we have to trust the client anyway, and the user could do
129 * anything after logging in anyway.
130 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000131static int all_opens_permitted = 0;
132
Ben Lindstrome9c99912001-06-09 00:41:05 +0000133
134/* -- X11 forwarding */
135
136/* Maximum number of fake X11 displays to try. */
137#define MAX_DISPLAYS 1000
138
Damien Miller13390022005-07-06 09:44:19 +1000139/* Saved X11 local (client) display. */
140static char *x11_saved_display = NULL;
141
Ben Lindstrome9c99912001-06-09 00:41:05 +0000142/* Saved X11 authentication protocol name. */
143static char *x11_saved_proto = NULL;
144
145/* Saved X11 authentication data. This is the real data. */
146static char *x11_saved_data = NULL;
147static u_int x11_saved_data_len = 0;
148
149/*
150 * Fake X11 authentication data. This is what the server will be sending us;
151 * we should replace any occurrences of this by the real data.
152 */
Damien Miller4ae97f12006-03-26 14:08:10 +1100153static u_char *x11_fake_data = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000154static u_int x11_fake_data_len;
155
156
157/* -- agent forwarding */
158
159#define NUM_SOCKS 10
160
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000161/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000162static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000163
Ben Lindstrome9c99912001-06-09 00:41:05 +0000164/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000165static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000166
Ben Lindstrome9c99912001-06-09 00:41:05 +0000167/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000168
169Channel *
Damien Millerd47c62a2005-12-13 19:33:57 +1100170channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000171{
172 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000173
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000174 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100175 logit("channel_by_id: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000176 return NULL;
177 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000178 c = channels[id];
179 if (c == NULL) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100180 logit("channel_by_id: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000181 return NULL;
182 }
183 return c;
184}
185
Damien Miller5428f641999-11-25 11:54:57 +1100186/*
Damien Millerd47c62a2005-12-13 19:33:57 +1100187 * Returns the channel if it is allowed to receive protocol messages.
188 * Private channels, like listening sockets, may not receive messages.
189 */
190Channel *
191channel_lookup(int id)
192{
193 Channel *c;
194
195 if ((c = channel_by_id(id)) == NULL)
196 return (NULL);
197
Damien Millerd62f2ca2006-03-26 13:57:41 +1100198 switch (c->type) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100199 case SSH_CHANNEL_X11_OPEN:
200 case SSH_CHANNEL_LARVAL:
201 case SSH_CHANNEL_CONNECTING:
202 case SSH_CHANNEL_DYNAMIC:
203 case SSH_CHANNEL_OPENING:
204 case SSH_CHANNEL_OPEN:
205 case SSH_CHANNEL_INPUT_DRAINING:
206 case SSH_CHANNEL_OUTPUT_DRAINING:
207 return (c);
Damien Millerd47c62a2005-12-13 19:33:57 +1100208 }
209 logit("Non-public channel %d, type %d.", id, c->type);
210 return (NULL);
211}
212
213/*
Damien Millere247cc42000-05-07 12:03:14 +1000214 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000215 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100216 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000217static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100218channel_register_fds(Channel *c, int rfd, int wfd, int efd,
219 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000220{
Damien Miller95def091999-11-25 00:26:21 +1100221 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100222 channel_max_fd = MAX(channel_max_fd, rfd);
223 channel_max_fd = MAX(channel_max_fd, wfd);
224 channel_max_fd = MAX(channel_max_fd, efd);
225
Damien Miller5428f641999-11-25 11:54:57 +1100226 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000227
Damien Miller6f83b8e2000-05-02 09:23:45 +1000228 c->rfd = rfd;
229 c->wfd = wfd;
230 c->sock = (rfd == wfd) ? rfd : -1;
Damien Miller0e220db2004-06-15 10:34:08 +1000231 c->ctl_fd = -1; /* XXX: set elsewhere */
Damien Miller6f83b8e2000-05-02 09:23:45 +1000232 c->efd = efd;
233 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100234
Damien Miller79438cc2001-02-16 12:34:57 +1100235 /* XXX ugly hack: nonblock is only set by the server */
236 if (nonblock && isatty(c->rfd)) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000237 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100238 c->isatty = 1;
239 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000240 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100241 c->self, c->wfd);
242 }
243 } else {
244 c->isatty = 0;
245 }
Ben Lindstrombeb5f332002-07-22 15:28:53 +0000246 c->wfd_isatty = isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100247
Damien Miller69b69aa2000-10-28 14:19:58 +1100248 /* enable nonblocking mode */
249 if (nonblock) {
250 if (rfd != -1)
251 set_nonblock(rfd);
252 if (wfd != -1)
253 set_nonblock(wfd);
254 if (efd != -1)
255 set_nonblock(efd);
256 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000257}
258
259/*
260 * Allocate a new channel object and set its type and socket. This will cause
261 * remote_name to be freed.
262 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000263Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000264channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000265 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000266{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000267 int found;
268 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000269 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000270
Damien Miller95def091999-11-25 00:26:21 +1100271 /* Do initial allocation if this is the first call. */
272 if (channels_alloc == 0) {
273 channels_alloc = 10;
Damien Miller07d86be2006-03-26 14:19:21 +1100274 channels = xcalloc(channels_alloc, sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100275 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000276 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100277 }
278 /* Try to find a free slot where to put the new channel. */
279 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000280 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100281 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000282 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100283 break;
284 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000285 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100286 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100287 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000288 if (channels_alloc > 10000)
289 fatal("channel_new: internal error: channels_alloc %d "
290 "too big.", channels_alloc);
Damien Miller36812092006-03-26 14:22:47 +1100291 channels = xrealloc(channels, channels_alloc + 10,
292 sizeof(Channel *));
Damien Miller5efcecc2003-09-17 07:31:14 +1000293 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100294 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100295 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000296 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100297 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000298 /* Initialize and return new channel. */
Damien Miller07d86be2006-03-26 14:19:21 +1100299 c = channels[found] = xcalloc(1, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100300 buffer_init(&c->input);
301 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000302 buffer_init(&c->extended);
Damien Miller5144df92002-01-22 23:28:45 +1100303 c->ostate = CHAN_OUTPUT_OPEN;
304 c->istate = CHAN_INPUT_OPEN;
305 c->flags = 0;
Damien Miller69b69aa2000-10-28 14:19:58 +1100306 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100307 c->self = found;
308 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000309 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000310 c->local_window = window;
311 c->local_window_max = window;
312 c->local_consumed = 0;
313 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100314 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000315 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000316 c->remote_window = 0;
317 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000318 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100319 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000320 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100321 c->detach_close = 0;
Damien Miller67f0bc02002-02-05 12:23:08 +1100322 c->confirm = NULL;
Damien Miller0e220db2004-06-15 10:34:08 +1000323 c->confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000324 c->input_filter = NULL;
Damien Miller077b2382005-12-31 16:22:32 +1100325 c->output_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100326 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000327 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000328}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000329
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000330static int
331channel_find_maxfd(void)
332{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000333 u_int i;
334 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000335 Channel *c;
336
337 for (i = 0; i < channels_alloc; i++) {
338 c = channels[i];
339 if (c != NULL) {
340 max = MAX(max, c->rfd);
341 max = MAX(max, c->wfd);
342 max = MAX(max, c->efd);
343 }
344 }
345 return max;
346}
347
348int
349channel_close_fd(int *fdp)
350{
351 int ret = 0, fd = *fdp;
352
353 if (fd != -1) {
354 ret = close(fd);
355 *fdp = -1;
356 if (fd == channel_max_fd)
357 channel_max_fd = channel_find_maxfd();
358 }
359 return ret;
360}
361
Damien Miller6f83b8e2000-05-02 09:23:45 +1000362/* Close all channel fd/socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000363static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000364channel_close_fds(Channel *c)
365{
Damien Miller0e220db2004-06-15 10:34:08 +1000366 debug3("channel %d: close_fds r %d w %d e %d c %d",
367 c->self, c->rfd, c->wfd, c->efd, c->ctl_fd);
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000368
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000369 channel_close_fd(&c->sock);
Damien Miller0e220db2004-06-15 10:34:08 +1000370 channel_close_fd(&c->ctl_fd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000371 channel_close_fd(&c->rfd);
372 channel_close_fd(&c->wfd);
373 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000374}
375
376/* Free the channel and close its fd/socket. */
Damien Miller4af51302000-04-16 11:18:38 +1000377void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000378channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000379{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000380 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000381 u_int i, n;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000382
383 for (n = 0, i = 0; i < channels_alloc; i++)
384 if (channels[i])
385 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000386 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000387 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000388
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000389 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000390 debug3("channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000391 xfree(s);
392
Damien Miller6f83b8e2000-05-02 09:23:45 +1000393 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000394 shutdown(c->sock, SHUT_RDWR);
Damien Miller0e220db2004-06-15 10:34:08 +1000395 if (c->ctl_fd != -1)
396 shutdown(c->ctl_fd, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000397 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000398 buffer_free(&c->input);
399 buffer_free(&c->output);
400 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000401 if (c->remote_name) {
402 xfree(c->remote_name);
403 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100404 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000405 channels[c->self] = NULL;
406 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000407}
408
Ben Lindstrome9c99912001-06-09 00:41:05 +0000409void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000410channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000411{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000412 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000413
Ben Lindstrom601e4362001-06-21 03:19:23 +0000414 for (i = 0; i < channels_alloc; i++)
415 if (channels[i] != NULL)
416 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000417}
418
419/*
420 * Closes the sockets/fds of all channels. This is used to close extra file
421 * descriptors after a fork.
422 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000423void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000424channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000425{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000426 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000427
428 for (i = 0; i < channels_alloc; i++)
429 if (channels[i] != NULL)
430 channel_close_fds(channels[i]);
431}
432
433/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000434 * Stop listening to channels.
435 */
Ben Lindstrom809744e2001-07-04 05:26:06 +0000436void
437channel_stop_listening(void)
438{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000439 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000440 Channel *c;
441
442 for (i = 0; i < channels_alloc; i++) {
443 c = channels[i];
444 if (c != NULL) {
445 switch (c->type) {
446 case SSH_CHANNEL_AUTH_SOCKET:
447 case SSH_CHANNEL_PORT_LISTENER:
448 case SSH_CHANNEL_RPORT_LISTENER:
449 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000450 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000451 channel_free(c);
452 break;
453 }
454 }
455 }
456}
457
458/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000459 * Returns true if no channel has too much buffered data, and false if one or
460 * more channel is overfull.
461 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000462int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000463channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000464{
465 u_int i;
466 Channel *c;
467
468 for (i = 0; i < channels_alloc; i++) {
469 c = channels[i];
470 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000471#if 0
472 if (!compat20 &&
473 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100474 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000475 c->self, buffer_len(&c->input));
476 return 0;
477 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000478#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000479 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000480 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000481 c->self, buffer_len(&c->output),
482 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000483 return 0;
484 }
485 }
486 }
487 return 1;
488}
489
490/* Returns true if any channel is still open. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000491int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000492channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000493{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000494 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000495 Channel *c;
496
497 for (i = 0; i < channels_alloc; i++) {
498 c = channels[i];
499 if (c == NULL)
500 continue;
501 switch (c->type) {
502 case SSH_CHANNEL_X11_LISTENER:
503 case SSH_CHANNEL_PORT_LISTENER:
504 case SSH_CHANNEL_RPORT_LISTENER:
505 case SSH_CHANNEL_CLOSED:
506 case SSH_CHANNEL_AUTH_SOCKET:
507 case SSH_CHANNEL_DYNAMIC:
508 case SSH_CHANNEL_CONNECTING:
509 case SSH_CHANNEL_ZOMBIE:
510 continue;
511 case SSH_CHANNEL_LARVAL:
512 if (!compat20)
513 fatal("cannot happen: SSH_CHANNEL_LARVAL");
514 continue;
515 case SSH_CHANNEL_OPENING:
516 case SSH_CHANNEL_OPEN:
517 case SSH_CHANNEL_X11_OPEN:
518 return 1;
519 case SSH_CHANNEL_INPUT_DRAINING:
520 case SSH_CHANNEL_OUTPUT_DRAINING:
521 if (!compat13)
522 fatal("cannot happen: OUT_DRAIN");
523 return 1;
524 default:
525 fatal("channel_still_open: bad channel type %d", c->type);
526 /* NOTREACHED */
527 }
528 }
529 return 0;
530}
531
532/* Returns the id of an open channel suitable for keepaliving */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000533int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000534channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000535{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000536 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000537 Channel *c;
538
539 for (i = 0; i < channels_alloc; i++) {
540 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000541 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000542 continue;
543 switch (c->type) {
544 case SSH_CHANNEL_CLOSED:
545 case SSH_CHANNEL_DYNAMIC:
546 case SSH_CHANNEL_X11_LISTENER:
547 case SSH_CHANNEL_PORT_LISTENER:
548 case SSH_CHANNEL_RPORT_LISTENER:
549 case SSH_CHANNEL_OPENING:
550 case SSH_CHANNEL_CONNECTING:
551 case SSH_CHANNEL_ZOMBIE:
552 continue;
553 case SSH_CHANNEL_LARVAL:
554 case SSH_CHANNEL_AUTH_SOCKET:
555 case SSH_CHANNEL_OPEN:
556 case SSH_CHANNEL_X11_OPEN:
557 return i;
558 case SSH_CHANNEL_INPUT_DRAINING:
559 case SSH_CHANNEL_OUTPUT_DRAINING:
560 if (!compat13)
561 fatal("cannot happen: OUT_DRAIN");
562 return i;
563 default:
564 fatal("channel_find_open: bad channel type %d", c->type);
565 /* NOTREACHED */
566 }
567 }
568 return -1;
569}
570
571
572/*
573 * Returns a message describing the currently open forwarded connections,
574 * suitable for sending to the client. The message contains crlf pairs for
575 * newlines.
576 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000577char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000578channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000579{
580 Buffer buffer;
581 Channel *c;
582 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000583 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000584
585 buffer_init(&buffer);
586 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
587 buffer_append(&buffer, buf, strlen(buf));
588 for (i = 0; i < channels_alloc; i++) {
589 c = channels[i];
590 if (c == NULL)
591 continue;
592 switch (c->type) {
593 case SSH_CHANNEL_X11_LISTENER:
594 case SSH_CHANNEL_PORT_LISTENER:
595 case SSH_CHANNEL_RPORT_LISTENER:
596 case SSH_CHANNEL_CLOSED:
597 case SSH_CHANNEL_AUTH_SOCKET:
598 case SSH_CHANNEL_ZOMBIE:
599 continue;
600 case SSH_CHANNEL_LARVAL:
601 case SSH_CHANNEL_OPENING:
602 case SSH_CHANNEL_CONNECTING:
603 case SSH_CHANNEL_DYNAMIC:
604 case SSH_CHANNEL_OPEN:
605 case SSH_CHANNEL_X11_OPEN:
606 case SSH_CHANNEL_INPUT_DRAINING:
607 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000608 snprintf(buf, sizeof buf,
609 " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cfd %d)\r\n",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000610 c->self, c->remote_name,
611 c->type, c->remote_id,
612 c->istate, buffer_len(&c->input),
613 c->ostate, buffer_len(&c->output),
Damien Miller0e220db2004-06-15 10:34:08 +1000614 c->rfd, c->wfd, c->ctl_fd);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000615 buffer_append(&buffer, buf, strlen(buf));
616 continue;
617 default:
618 fatal("channel_open_message: bad channel type %d", c->type);
619 /* NOTREACHED */
620 }
621 }
622 buffer_append(&buffer, "\0", 1);
623 cp = xstrdup(buffer_ptr(&buffer));
624 buffer_free(&buffer);
625 return cp;
626}
627
628void
629channel_send_open(int id)
630{
631 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000632
Ben Lindstrome9c99912001-06-09 00:41:05 +0000633 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000634 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000635 return;
636 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000637 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000638 packet_start(SSH2_MSG_CHANNEL_OPEN);
639 packet_put_cstring(c->ctype);
640 packet_put_int(c->self);
641 packet_put_int(c->local_window);
642 packet_put_int(c->local_maxpacket);
643 packet_send();
644}
645
646void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000647channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000648{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000649 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000650
Ben Lindstrome9c99912001-06-09 00:41:05 +0000651 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000652 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000653 return;
654 }
Damien Miller0e220db2004-06-15 10:34:08 +1000655 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000656 packet_start(SSH2_MSG_CHANNEL_REQUEST);
657 packet_put_int(c->remote_id);
658 packet_put_cstring(service);
659 packet_put_char(wantconfirm);
660}
Damien Miller4f7becb2006-03-26 14:10:14 +1100661
Ben Lindstrome9c99912001-06-09 00:41:05 +0000662void
Damien Miller0e220db2004-06-15 10:34:08 +1000663channel_register_confirm(int id, channel_callback_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000664{
665 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000666
Ben Lindstrome9c99912001-06-09 00:41:05 +0000667 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000668 logit("channel_register_comfirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000669 return;
670 }
Damien Miller67f0bc02002-02-05 12:23:08 +1100671 c->confirm = fn;
Damien Miller0e220db2004-06-15 10:34:08 +1000672 c->confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000673}
Damien Miller4f7becb2006-03-26 14:10:14 +1100674
Ben Lindstrome9c99912001-06-09 00:41:05 +0000675void
Damien Miller39eda6e2005-11-05 14:52:50 +1100676channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000677{
Damien Millerd47c62a2005-12-13 19:33:57 +1100678 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000679
Ben Lindstrome9c99912001-06-09 00:41:05 +0000680 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000681 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000682 return;
683 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000684 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100685 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000686}
Damien Miller4f7becb2006-03-26 14:10:14 +1100687
Ben Lindstrome9c99912001-06-09 00:41:05 +0000688void
689channel_cancel_cleanup(int id)
690{
Damien Millerd47c62a2005-12-13 19:33:57 +1100691 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000692
Ben Lindstrome9c99912001-06-09 00:41:05 +0000693 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000694 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000695 return;
696 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000697 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100698 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000699}
Damien Miller4f7becb2006-03-26 14:10:14 +1100700
Ben Lindstrome9c99912001-06-09 00:41:05 +0000701void
Damien Miller077b2382005-12-31 16:22:32 +1100702channel_register_filter(int id, channel_infilter_fn *ifn,
703 channel_outfilter_fn *ofn)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000704{
705 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000706
Ben Lindstrome9c99912001-06-09 00:41:05 +0000707 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000708 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000709 return;
710 }
Damien Miller077b2382005-12-31 16:22:32 +1100711 c->input_filter = ifn;
712 c->output_filter = ofn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000713}
714
715void
716channel_set_fds(int id, int rfd, int wfd, int efd,
Damien Miller2aa0c192002-02-19 15:20:08 +1100717 int extusage, int nonblock, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000718{
719 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000720
Ben Lindstrome9c99912001-06-09 00:41:05 +0000721 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
722 fatal("channel_activate for non-larval channel %d.", id);
723 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
724 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100725 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000726 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
727 packet_put_int(c->remote_id);
728 packet_put_int(c->local_window);
729 packet_send();
730}
731
Damien Miller5428f641999-11-25 11:54:57 +1100732/*
Damien Millerb38eff82000-04-01 11:09:21 +1000733 * 'channel_pre*' are called just before select() to add any bits relevant to
734 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100735 */
Damien Millerb38eff82000-04-01 11:09:21 +1000736/*
737 * 'channel_post*': perform any appropriate operations for channels which
738 * have events pending.
739 */
Damien Millerd62f2ca2006-03-26 13:57:41 +1100740typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000741chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
742chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
743
Damien Miller8473dd82006-07-24 14:08:32 +1000744/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000745static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100746channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000747{
748 FD_SET(c->sock, readset);
749}
750
Damien Miller8473dd82006-07-24 14:08:32 +1000751/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000752static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100753channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000754{
755 debug3("channel %d: waiting for connection", c->self);
756 FD_SET(c->sock, writeset);
757}
758
Ben Lindstrombba81212001-06-25 05:01:22 +0000759static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100760channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000761{
762 if (buffer_len(&c->input) < packet_get_maxsize())
763 FD_SET(c->sock, readset);
764 if (buffer_len(&c->output) > 0)
765 FD_SET(c->sock, writeset);
766}
767
Ben Lindstrombba81212001-06-25 05:01:22 +0000768static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100769channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000770{
Damien Millerde6987c2002-01-22 23:20:40 +1100771 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000772
Damien Miller33b13562000-04-04 14:38:59 +1000773 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100774 limit > 0 &&
Damien Miller499a0d52006-04-23 12:06:03 +1000775 buffer_len(&c->input) < limit &&
776 buffer_check_alloc(&c->input, CHAN_RBUF))
Damien Miller33b13562000-04-04 14:38:59 +1000777 FD_SET(c->rfd, readset);
778 if (c->ostate == CHAN_OUTPUT_OPEN ||
779 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
780 if (buffer_len(&c->output) > 0) {
781 FD_SET(c->wfd, writeset);
782 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000783 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000784 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
785 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000786 else
787 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000788 }
789 }
790 /** XXX check close conditions, too */
Damien Millerde6987c2002-01-22 23:20:40 +1100791 if (compat20 && c->efd != -1) {
Damien Miller33b13562000-04-04 14:38:59 +1000792 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
793 buffer_len(&c->extended) > 0)
794 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000795 else if (!(c->flags & CHAN_EOF_SENT) &&
796 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000797 buffer_len(&c->extended) < c->remote_window)
798 FD_SET(c->efd, readset);
799 }
Damien Miller0e220db2004-06-15 10:34:08 +1000800 /* XXX: What about efd? races? */
Darren Tuckerfc959702004-07-17 16:12:08 +1000801 if (compat20 && c->ctl_fd != -1 &&
Damien Miller0e220db2004-06-15 10:34:08 +1000802 c->istate == CHAN_INPUT_OPEN && c->ostate == CHAN_OUTPUT_OPEN)
803 FD_SET(c->ctl_fd, readset);
Damien Miller33b13562000-04-04 14:38:59 +1000804}
805
Damien Miller8473dd82006-07-24 14:08:32 +1000806/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000807static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100808channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000809{
810 if (buffer_len(&c->input) == 0) {
811 packet_start(SSH_MSG_CHANNEL_CLOSE);
812 packet_put_int(c->remote_id);
813 packet_send();
814 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000815 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000816 }
817}
818
Damien Miller8473dd82006-07-24 14:08:32 +1000819/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000820static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100821channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000822{
823 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000824 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000825 else
Damien Millerb38eff82000-04-01 11:09:21 +1000826 FD_SET(c->sock, writeset);
827}
828
829/*
830 * This is a special state for X11 authentication spoofing. An opened X11
831 * connection (when authentication spoofing is being done) remains in this
832 * state until the first packet has been completely read. The authentication
833 * data in that packet is then substituted by the real data if it matches the
834 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000835 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000836 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000837 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000838static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000839x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000840{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000841 u_char *ucp;
842 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000843
844 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000845 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000846 return 0;
847
848 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100849 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000850 if (ucp[0] == 0x42) { /* Byte order MSB first. */
851 proto_len = 256 * ucp[6] + ucp[7];
852 data_len = 256 * ucp[8] + ucp[9];
853 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
854 proto_len = ucp[6] + 256 * ucp[7];
855 data_len = ucp[8] + 256 * ucp[9];
856 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000857 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100858 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000859 return -1;
860 }
861
862 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000863 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000864 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
865 return 0;
866
867 /* Check if authentication protocol matches. */
868 if (proto_len != strlen(x11_saved_proto) ||
869 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000870 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000871 return -1;
872 }
873 /* Check if authentication data matches our fake data. */
874 if (data_len != x11_fake_data_len ||
875 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
876 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000877 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000878 return -1;
879 }
880 /* Check fake data length */
881 if (x11_fake_data_len != x11_saved_data_len) {
882 error("X11 fake_data_len %d != saved_data_len %d",
883 x11_fake_data_len, x11_saved_data_len);
884 return -1;
885 }
886 /*
887 * Received authentication protocol and data match
888 * our fake data. Substitute the fake data with real
889 * data.
890 */
891 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
892 x11_saved_data, x11_saved_data_len);
893 return 1;
894}
895
Ben Lindstrombba81212001-06-25 05:01:22 +0000896static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100897channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000898{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000899 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000900
Damien Millerb38eff82000-04-01 11:09:21 +1000901 if (ret == 1) {
902 /* Start normal processing for the channel. */
903 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000904 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000905 } else if (ret == -1) {
906 /*
907 * We have received an X11 connection that has bad
908 * authentication information.
909 */
Damien Miller996acd22003-04-09 20:59:48 +1000910 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000911 buffer_clear(&c->input);
912 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000913 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000914 c->sock = -1;
915 c->type = SSH_CHANNEL_CLOSED;
916 packet_start(SSH_MSG_CHANNEL_CLOSE);
917 packet_put_int(c->remote_id);
918 packet_send();
919 }
920}
921
Ben Lindstrombba81212001-06-25 05:01:22 +0000922static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100923channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000924{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000925 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000926
927 /* c->force_drain = 1; */
928
Damien Millerb38eff82000-04-01 11:09:21 +1000929 if (ret == 1) {
930 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100931 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000932 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000933 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000934 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100935 chan_read_failed(c);
936 buffer_clear(&c->input);
937 chan_ibuf_empty(c);
938 buffer_clear(&c->output);
939 /* for proto v1, the peer will send an IEOF */
940 if (compat20)
941 chan_write_failed(c);
942 else
943 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000944 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000945 }
946}
947
Ben Lindstromb3921512001-04-11 15:57:50 +0000948/* try to decode a socks4 header */
Damien Miller8473dd82006-07-24 14:08:32 +1000949/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000950static int
Damien Millerd62f2ca2006-03-26 13:57:41 +1100951channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000952{
Damien Millera10f5612002-09-12 09:49:15 +1000953 char *p, *host;
Damien Millereccb9de2005-06-17 12:59:34 +1000954 u_int len, have, i, found;
Damien Miller9f0f5c62001-12-21 14:45:46 +1100955 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000956 struct {
957 u_int8_t version;
958 u_int8_t command;
959 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000960 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000961 } s4_req, s4_rsp;
962
Ben Lindstromb3921512001-04-11 15:57:50 +0000963 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000964
965 have = buffer_len(&c->input);
966 len = sizeof(s4_req);
967 if (have < len)
968 return 0;
969 p = buffer_ptr(&c->input);
970 for (found = 0, i = len; i < have; i++) {
971 if (p[i] == '\0') {
972 found = 1;
973 break;
974 }
975 if (i > 1024) {
976 /* the peer is probably sending garbage */
977 debug("channel %d: decode socks4: too long",
978 c->self);
979 return -1;
980 }
981 }
982 if (!found)
983 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000984 buffer_get(&c->input, (char *)&s4_req.version, 1);
985 buffer_get(&c->input, (char *)&s4_req.command, 1);
986 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000987 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000988 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000989 p = buffer_ptr(&c->input);
990 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000991 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000992 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000993 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000994 c->self, len, have);
995 strlcpy(username, p, sizeof(username));
996 buffer_consume(&c->input, len);
997 buffer_consume(&c->input, 1); /* trailing '\0' */
998
Ben Lindstromb3921512001-04-11 15:57:50 +0000999 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001000 strlcpy(c->path, host, sizeof(c->path));
1001 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001002
Damien Millerfbdeece2003-09-02 22:52:31 +10001003 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001004 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001005
Ben Lindstromb3921512001-04-11 15:57:50 +00001006 if (s4_req.command != 1) {
1007 debug("channel %d: cannot handle: socks4 cn %d",
1008 c->self, s4_req.command);
1009 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001010 }
Ben Lindstromb3921512001-04-11 15:57:50 +00001011 s4_rsp.version = 0; /* vn: 0 for reply */
1012 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001013 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +00001014 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Damien Millera0fdce92006-03-26 14:28:50 +11001015 buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +00001016 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001017}
1018
Darren Tucker46471c92003-07-03 13:55:19 +10001019/* try to decode a socks5 header */
1020#define SSH_SOCKS5_AUTHDONE 0x1000
1021#define SSH_SOCKS5_NOAUTH 0x00
1022#define SSH_SOCKS5_IPV4 0x01
1023#define SSH_SOCKS5_DOMAIN 0x03
1024#define SSH_SOCKS5_IPV6 0x04
1025#define SSH_SOCKS5_CONNECT 0x01
1026#define SSH_SOCKS5_SUCCESS 0x00
1027
Damien Miller8473dd82006-07-24 14:08:32 +10001028/* ARGSUSED */
Darren Tucker46471c92003-07-03 13:55:19 +10001029static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001030channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
Darren Tucker46471c92003-07-03 13:55:19 +10001031{
1032 struct {
1033 u_int8_t version;
1034 u_int8_t command;
1035 u_int8_t reserved;
1036 u_int8_t atyp;
1037 } s5_req, s5_rsp;
1038 u_int16_t dest_port;
1039 u_char *p, dest_addr[255+1];
Damien Miller0f077072006-07-10 22:21:02 +10001040 u_int have, need, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001041
1042 debug2("channel %d: decode socks5", c->self);
1043 p = buffer_ptr(&c->input);
1044 if (p[0] != 0x05)
1045 return -1;
1046 have = buffer_len(&c->input);
1047 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1048 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001049 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001050 return 0;
1051 nmethods = p[1];
1052 if (have < nmethods + 2)
1053 return 0;
1054 /* look for method: "NO AUTHENTICATION REQUIRED" */
Damien Miller80163902007-01-05 16:30:16 +11001055 for (found = 0, i = 2; i < nmethods + 2; i++) {
Damien Miller4dec5d72006-08-05 11:38:40 +10001056 if (p[i] == SSH_SOCKS5_NOAUTH) {
Darren Tucker46471c92003-07-03 13:55:19 +10001057 found = 1;
1058 break;
1059 }
1060 }
1061 if (!found) {
1062 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1063 c->self);
1064 return -1;
1065 }
1066 buffer_consume(&c->input, nmethods + 2);
1067 buffer_put_char(&c->output, 0x05); /* version */
1068 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1069 FD_SET(c->sock, writeset);
1070 c->flags |= SSH_SOCKS5_AUTHDONE;
1071 debug2("channel %d: socks5 auth done", c->self);
1072 return 0; /* need more */
1073 }
1074 debug2("channel %d: socks5 post auth", c->self);
1075 if (have < sizeof(s5_req)+1)
1076 return 0; /* need more */
Damien Millere3b21a52006-03-26 14:29:06 +11001077 memcpy(&s5_req, p, sizeof(s5_req));
Darren Tucker46471c92003-07-03 13:55:19 +10001078 if (s5_req.version != 0x05 ||
1079 s5_req.command != SSH_SOCKS5_CONNECT ||
1080 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001081 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001082 return -1;
1083 }
Darren Tucker47eede72005-03-14 23:08:12 +11001084 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001085 case SSH_SOCKS5_IPV4:
1086 addrlen = 4;
1087 af = AF_INET;
1088 break;
1089 case SSH_SOCKS5_DOMAIN:
1090 addrlen = p[sizeof(s5_req)];
1091 af = -1;
1092 break;
1093 case SSH_SOCKS5_IPV6:
1094 addrlen = 16;
1095 af = AF_INET6;
1096 break;
1097 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001098 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001099 return -1;
1100 }
Damien Miller0f077072006-07-10 22:21:02 +10001101 need = sizeof(s5_req) + addrlen + 2;
1102 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1103 need++;
1104 if (have < need)
Darren Tucker46471c92003-07-03 13:55:19 +10001105 return 0;
1106 buffer_consume(&c->input, sizeof(s5_req));
1107 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1108 buffer_consume(&c->input, 1); /* host string length */
1109 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1110 buffer_get(&c->input, (char *)&dest_port, 2);
1111 dest_addr[addrlen] = '\0';
1112 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
Darren Tucker1f8311c2004-05-13 16:39:33 +10001113 strlcpy(c->path, (char *)dest_addr, sizeof(c->path));
Darren Tucker46471c92003-07-03 13:55:19 +10001114 else if (inet_ntop(af, dest_addr, c->path, sizeof(c->path)) == NULL)
1115 return -1;
1116 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001117
Damien Millerfbdeece2003-09-02 22:52:31 +10001118 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001119 c->self, c->path, c->host_port, s5_req.command);
1120
1121 s5_rsp.version = 0x05;
1122 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1123 s5_rsp.reserved = 0; /* ignored */
1124 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1125 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1126 dest_port = 0; /* ignored */
1127
Damien Millera0fdce92006-03-26 14:28:50 +11001128 buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp));
1129 buffer_append(&c->output, &dest_addr, sizeof(struct in_addr));
1130 buffer_append(&c->output, &dest_port, sizeof(dest_port));
Darren Tucker46471c92003-07-03 13:55:19 +10001131 return 1;
1132}
1133
Ben Lindstromb3921512001-04-11 15:57:50 +00001134/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001135static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001136channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstromb3921512001-04-11 15:57:50 +00001137{
1138 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001139 u_int have;
1140 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001141
1142 have = buffer_len(&c->input);
Damien Miller4623a752001-10-10 15:03:58 +10001143 c->delayed = 0;
Ben Lindstromb3921512001-04-11 15:57:50 +00001144 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001145 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001146 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001147 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001148 /* need more */
1149 FD_SET(c->sock, readset);
1150 return;
1151 }
1152 /* try to guess the protocol */
1153 p = buffer_ptr(&c->input);
1154 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001155 case 0x04:
1156 ret = channel_decode_socks4(c, readset, writeset);
1157 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001158 case 0x05:
1159 ret = channel_decode_socks5(c, readset, writeset);
1160 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001161 default:
1162 ret = -1;
1163 break;
1164 }
1165 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001166 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001167 } else if (ret == 0) {
1168 debug2("channel %d: pre_dynamic: need more", c->self);
1169 /* need more */
1170 FD_SET(c->sock, readset);
1171 } else {
1172 /* switch to the next state */
1173 c->type = SSH_CHANNEL_OPENING;
1174 port_open_helper(c, "direct-tcpip");
1175 }
1176}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001177
Damien Millerb38eff82000-04-01 11:09:21 +10001178/* This is our fake X11 server socket. */
Damien Miller8473dd82006-07-24 14:08:32 +10001179/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001180static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001181channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001182{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001183 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001184 struct sockaddr addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001185 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001186 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001187 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001188 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001189
1190 if (FD_ISSET(c->sock, readset)) {
1191 debug("X11 connection requested.");
1192 addrlen = sizeof(addr);
1193 newsock = accept(c->sock, &addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001194 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001195 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001196 channel_close_fd(&c->sock);
1197 chan_mark_dead(c);
1198 }
Damien Millerb38eff82000-04-01 11:09:21 +10001199 if (newsock < 0) {
1200 error("accept: %.100s", strerror(errno));
1201 return;
1202 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001203 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001204 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001205 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001206 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001207 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001208
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001209 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001210 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001211 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001212 if (compat20) {
1213 packet_start(SSH2_MSG_CHANNEL_OPEN);
1214 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001215 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001216 packet_put_int(nc->local_window_max);
1217 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001218 /* originator ipaddr and port */
1219 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001220 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001221 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001222 } else {
1223 packet_put_int(remote_port);
1224 }
Damien Millerbd483e72000-04-30 10:00:53 +10001225 packet_send();
1226 } else {
1227 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001228 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001229 if (packet_get_protocol_flags() &
1230 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001231 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001232 packet_send();
1233 }
Damien Millerd83ff352001-01-30 09:19:34 +11001234 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001235 }
1236}
1237
Ben Lindstrombba81212001-06-25 05:01:22 +00001238static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001239port_open_helper(Channel *c, char *rtype)
1240{
1241 int direct;
1242 char buf[1024];
1243 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001244 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001245
1246 direct = (strcmp(rtype, "direct-tcpip") == 0);
1247
1248 snprintf(buf, sizeof buf,
1249 "%s: listening port %d for %.100s port %d, "
1250 "connect from %.200s port %d",
1251 rtype, c->listening_port, c->path, c->host_port,
1252 remote_ipaddr, remote_port);
1253
1254 xfree(c->remote_name);
1255 c->remote_name = xstrdup(buf);
1256
1257 if (compat20) {
1258 packet_start(SSH2_MSG_CHANNEL_OPEN);
1259 packet_put_cstring(rtype);
1260 packet_put_int(c->self);
1261 packet_put_int(c->local_window_max);
1262 packet_put_int(c->local_maxpacket);
1263 if (direct) {
1264 /* target host, port */
1265 packet_put_cstring(c->path);
1266 packet_put_int(c->host_port);
1267 } else {
1268 /* listen address, port */
1269 packet_put_cstring(c->path);
1270 packet_put_int(c->listening_port);
1271 }
1272 /* originator host and port */
1273 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001274 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001275 packet_send();
1276 } else {
1277 packet_start(SSH_MSG_PORT_OPEN);
1278 packet_put_int(c->self);
1279 packet_put_cstring(c->path);
1280 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001281 if (packet_get_protocol_flags() &
1282 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001283 packet_put_cstring(c->remote_name);
1284 packet_send();
1285 }
1286 xfree(remote_ipaddr);
1287}
1288
Damien Miller5e7fd072005-11-05 14:53:39 +11001289static void
1290channel_set_reuseaddr(int fd)
1291{
1292 int on = 1;
1293
1294 /*
1295 * Set socket options.
1296 * Allow local port reuse in TIME_WAIT.
1297 */
1298 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1299 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1300}
1301
Damien Millerb38eff82000-04-01 11:09:21 +10001302/*
1303 * This socket is listening for connections to a forwarded TCP/IP port.
1304 */
Damien Miller8473dd82006-07-24 14:08:32 +10001305/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001306static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001307channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001308{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001309 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +10001310 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001311 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001312 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001313 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001314
Damien Millerb38eff82000-04-01 11:09:21 +10001315 if (FD_ISSET(c->sock, readset)) {
1316 debug("Connection to port %d forwarding "
1317 "to %.100s port %d requested.",
1318 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001319
Damien Miller4623a752001-10-10 15:03:58 +10001320 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1321 nextstate = SSH_CHANNEL_OPENING;
1322 rtype = "forwarded-tcpip";
1323 } else {
1324 if (c->host_port == 0) {
1325 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001326 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001327 } else {
1328 nextstate = SSH_CHANNEL_OPENING;
1329 rtype = "direct-tcpip";
1330 }
1331 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001332
Damien Millerb38eff82000-04-01 11:09:21 +10001333 addrlen = sizeof(addr);
1334 newsock = accept(c->sock, &addr, &addrlen);
1335 if (newsock < 0) {
1336 error("accept: %.100s", strerror(errno));
1337 return;
1338 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001339 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001340 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1341 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001342 nc->listening_port = c->listening_port;
1343 nc->host_port = c->host_port;
1344 strlcpy(nc->path, c->path, sizeof(nc->path));
1345
Damien Miller4623a752001-10-10 15:03:58 +10001346 if (nextstate == SSH_CHANNEL_DYNAMIC) {
1347 /*
1348 * do not call the channel_post handler until
1349 * this flag has been reset by a pre-handler.
1350 * otherwise the FD_ISSET calls might overflow
1351 */
1352 nc->delayed = 1;
1353 } else {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001354 port_open_helper(nc, rtype);
Damien Miller4623a752001-10-10 15:03:58 +10001355 }
Damien Millerb38eff82000-04-01 11:09:21 +10001356 }
1357}
1358
1359/*
1360 * This is the authentication agent socket listening for connections from
1361 * clients.
1362 */
Damien Miller8473dd82006-07-24 14:08:32 +10001363/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001364static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001365channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001366{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001367 Channel *nc;
1368 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001369 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001370 socklen_t addrlen;
1371
1372 if (FD_ISSET(c->sock, readset)) {
1373 addrlen = sizeof(addr);
1374 newsock = accept(c->sock, &addr, &addrlen);
1375 if (newsock < 0) {
1376 error("accept from auth socket: %.100s", strerror(errno));
1377 return;
1378 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001379 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001380 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1381 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001382 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001383 if (compat20) {
1384 packet_start(SSH2_MSG_CHANNEL_OPEN);
1385 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001386 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001387 packet_put_int(c->local_window_max);
1388 packet_put_int(c->local_maxpacket);
1389 } else {
1390 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001391 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001392 }
Damien Millerb38eff82000-04-01 11:09:21 +10001393 packet_send();
1394 }
1395}
1396
Damien Miller8473dd82006-07-24 14:08:32 +10001397/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001398static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001399channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001400{
Ben Lindstrom69128662001-05-08 20:07:39 +00001401 int err = 0;
Ben Lindstrom11180952001-07-04 05:13:35 +00001402 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001403
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001404 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001405 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001406 err = errno;
1407 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001408 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001409 if (err == 0) {
1410 debug("channel %d: connected", c->self);
1411 c->type = SSH_CHANNEL_OPEN;
1412 if (compat20) {
1413 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1414 packet_put_int(c->remote_id);
1415 packet_put_int(c->self);
1416 packet_put_int(c->local_window);
1417 packet_put_int(c->local_maxpacket);
1418 } else {
1419 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1420 packet_put_int(c->remote_id);
1421 packet_put_int(c->self);
1422 }
1423 } else {
1424 debug("channel %d: not connected: %s",
1425 c->self, strerror(err));
1426 if (compat20) {
1427 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1428 packet_put_int(c->remote_id);
1429 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1430 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1431 packet_put_cstring(strerror(err));
1432 packet_put_cstring("");
1433 }
1434 } else {
1435 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1436 packet_put_int(c->remote_id);
1437 }
1438 chan_mark_dead(c);
1439 }
1440 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001441 }
1442}
1443
Damien Miller8473dd82006-07-24 14:08:32 +10001444/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001445static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001446channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001447{
Darren Tucker11327cc2005-03-14 23:22:25 +11001448 char buf[CHAN_RBUF];
Damien Miller835284b2007-06-11 13:03:16 +10001449 int len, force;
Damien Millerb38eff82000-04-01 11:09:21 +10001450
Damien Miller835284b2007-06-11 13:03:16 +10001451 force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED;
1452 if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001453 errno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001454 len = read(c->rfd, buf, sizeof(buf));
Damien Miller835284b2007-06-11 13:03:16 +10001455 if (len < 0 && (errno == EINTR || (errno == EAGAIN && !force)))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001456 return 1;
Darren Tucker9afe1152006-06-23 21:24:12 +10001457#ifndef PTY_ZEROREAD
Damien Millerb38eff82000-04-01 11:09:21 +10001458 if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001459#else
Darren Tucker144e8d62006-06-25 08:25:25 +10001460 if ((!c->isatty && len <= 0) ||
1461 (c->isatty && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001462#endif
Damien Millerfbdeece2003-09-02 22:52:31 +10001463 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001464 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001465 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001466 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001467 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001468 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001469 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001470 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001471 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001472 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001473 } else {
1474 chan_read_failed(c);
1475 }
1476 return -1;
1477 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001478 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001479 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001480 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001481 chan_read_failed(c);
1482 }
Damien Millerd27b9472005-12-13 19:29:02 +11001483 } else if (c->datagram) {
1484 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001485 } else {
1486 buffer_append(&c->input, buf, len);
1487 }
Damien Millerb38eff82000-04-01 11:09:21 +10001488 }
1489 return 1;
1490}
Damien Miller4f7becb2006-03-26 14:10:14 +11001491
Damien Miller8473dd82006-07-24 14:08:32 +10001492/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001493static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001494channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001495{
Ben Lindstrome229b252001-03-05 06:28:06 +00001496 struct termios tio;
Damien Miller077b2382005-12-31 16:22:32 +11001497 u_char *data = NULL, *buf;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001498 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001499 int len;
1500
1501 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001502 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001503 FD_ISSET(c->wfd, writeset) &&
1504 buffer_len(&c->output) > 0) {
Damien Miller077b2382005-12-31 16:22:32 +11001505 if (c->output_filter != NULL) {
1506 if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1507 debug2("channel %d: filter stops", c->self);
Damien Millere204f6a2006-01-31 21:47:15 +11001508 if (c->type != SSH_CHANNEL_OPEN)
1509 chan_mark_dead(c);
1510 else
1511 chan_write_failed(c);
1512 return -1;
Damien Miller077b2382005-12-31 16:22:32 +11001513 }
1514 } else if (c->datagram) {
1515 buf = data = buffer_get_string(&c->output, &dlen);
1516 } else {
1517 buf = data = buffer_ptr(&c->output);
1518 dlen = buffer_len(&c->output);
1519 }
1520
Damien Millerd27b9472005-12-13 19:29:02 +11001521 if (c->datagram) {
Damien Millerd27b9472005-12-13 19:29:02 +11001522 /* ignore truncated writes, datagrams might get lost */
1523 c->local_consumed += dlen + 4;
Damien Miller077b2382005-12-31 16:22:32 +11001524 len = write(c->wfd, buf, dlen);
Damien Millerd27b9472005-12-13 19:29:02 +11001525 xfree(data);
1526 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1527 return 1;
1528 if (len <= 0) {
1529 if (c->type != SSH_CHANNEL_OPEN)
1530 chan_mark_dead(c);
1531 else
1532 chan_write_failed(c);
1533 return -1;
1534 }
1535 return 1;
1536 }
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001537#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001538 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001539 if (compat20 && c->wfd_isatty)
1540 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001541#endif
Damien Miller077b2382005-12-31 16:22:32 +11001542
1543 len = write(c->wfd, buf, dlen);
Damien Miller6f83b8e2000-05-02 09:23:45 +10001544 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1545 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001546 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001547 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001548 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001549 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001550 return -1;
1551 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001552 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001553 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001554 c->type = SSH_CHANNEL_INPUT_DRAINING;
1555 } else {
1556 chan_write_failed(c);
1557 }
1558 return -1;
1559 }
Damien Miller077b2382005-12-31 16:22:32 +11001560 if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001561 if (tcgetattr(c->wfd, &tio) == 0 &&
1562 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1563 /*
1564 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001565 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001566 * size of a SSH2_MSG_CHANNEL_DATA message
Damien Miller077b2382005-12-31 16:22:32 +11001567 * (4 byte channel id + buf)
Damien Miller79438cc2001-02-16 12:34:57 +11001568 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001569 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001570 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001571 }
1572 }
Damien Millerb38eff82000-04-01 11:09:21 +10001573 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001574 if (compat20 && len > 0) {
1575 c->local_consumed += len;
1576 }
1577 }
1578 return 1;
1579}
Damien Miller4f7becb2006-03-26 14:10:14 +11001580
Ben Lindstrombba81212001-06-25 05:01:22 +00001581static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001582channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller33b13562000-04-04 14:38:59 +10001583{
Darren Tucker11327cc2005-03-14 23:22:25 +11001584 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001585 int len;
1586
Damien Miller1383bd82000-04-06 12:32:37 +10001587/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001588 if (c->efd != -1) {
1589 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1590 FD_ISSET(c->efd, writeset) &&
1591 buffer_len(&c->extended) > 0) {
1592 len = write(c->efd, buffer_ptr(&c->extended),
1593 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001594 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001595 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001596 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1597 return 1;
1598 if (len <= 0) {
1599 debug2("channel %d: closing write-efd %d",
1600 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001601 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001602 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001603 buffer_consume(&c->extended, len);
1604 c->local_consumed += len;
1605 }
1606 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
Damien Millere42bd242007-01-29 10:16:28 +11001607 (c->detach_close || FD_ISSET(c->efd, readset))) {
Damien Miller33b13562000-04-04 14:38:59 +10001608 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001609 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001610 c->self, len, c->efd);
Damien Millere42bd242007-01-29 10:16:28 +11001611 if (len < 0 && (errno == EINTR ||
1612 (errno == EAGAIN && !c->detach_close)))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001613 return 1;
1614 if (len <= 0) {
1615 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001616 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001617 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001618 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001619 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001620 }
Damien Miller33b13562000-04-04 14:38:59 +10001621 }
1622 }
1623 return 1;
1624}
Damien Miller4f7becb2006-03-26 14:10:14 +11001625
Damien Miller8473dd82006-07-24 14:08:32 +10001626/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001627static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001628channel_handle_ctl(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller0e220db2004-06-15 10:34:08 +10001629{
1630 char buf[16];
1631 int len;
1632
1633 /* Monitor control fd to detect if the slave client exits */
1634 if (c->ctl_fd != -1 && FD_ISSET(c->ctl_fd, readset)) {
1635 len = read(c->ctl_fd, buf, sizeof(buf));
1636 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1637 return 1;
1638 if (len <= 0) {
1639 debug2("channel %d: ctl read<=0", c->self);
1640 if (c->type != SSH_CHANNEL_OPEN) {
1641 debug2("channel %d: not open", c->self);
1642 chan_mark_dead(c);
1643 return -1;
1644 } else {
1645 chan_read_failed(c);
1646 chan_write_failed(c);
1647 }
1648 return -1;
1649 } else
1650 fatal("%s: unexpected data on ctl fd", __func__);
1651 }
1652 return 1;
1653}
Damien Miller4f7becb2006-03-26 14:10:14 +11001654
Damien Miller0e220db2004-06-15 10:34:08 +10001655static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001656channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001657{
Ben Lindstromb3921512001-04-11 15:57:50 +00001658 if (c->type == SSH_CHANNEL_OPEN &&
1659 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Darren Tuckerae09cb82007-06-25 19:04:46 +10001660 ((c->local_window_max - c->local_window >
Damien Miller3191a8e2007-06-11 18:33:15 +10001661 c->local_maxpacket*3) ||
1662 c->local_window < c->local_window_max/2) &&
Damien Miller33b13562000-04-04 14:38:59 +10001663 c->local_consumed > 0) {
1664 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1665 packet_put_int(c->remote_id);
1666 packet_put_int(c->local_consumed);
1667 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001668 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001669 c->self, c->local_window,
1670 c->local_consumed);
1671 c->local_window += c->local_consumed;
1672 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001673 }
1674 return 1;
1675}
1676
Ben Lindstrombba81212001-06-25 05:01:22 +00001677static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001678channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001679{
Damien Miller4623a752001-10-10 15:03:58 +10001680 if (c->delayed)
1681 return;
Damien Millerb38eff82000-04-01 11:09:21 +10001682 channel_handle_rfd(c, readset, writeset);
1683 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001684 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001685 return;
Damien Miller33b13562000-04-04 14:38:59 +10001686 channel_handle_efd(c, readset, writeset);
Damien Miller0e220db2004-06-15 10:34:08 +10001687 channel_handle_ctl(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001688 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001689}
1690
Damien Miller8473dd82006-07-24 14:08:32 +10001691/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001692static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001693channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001694{
1695 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001696
Damien Millerb38eff82000-04-01 11:09:21 +10001697 /* Send buffered output data to the socket. */
1698 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1699 len = write(c->sock, buffer_ptr(&c->output),
1700 buffer_len(&c->output));
1701 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001702 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001703 else
1704 buffer_consume(&c->output, len);
1705 }
1706}
1707
Ben Lindstrombba81212001-06-25 05:01:22 +00001708static void
Damien Miller33b13562000-04-04 14:38:59 +10001709channel_handler_init_20(void)
1710{
Damien Millerde6987c2002-01-22 23:20:40 +11001711 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001712 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001713 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001714 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001715 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001716 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001717 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001718 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001719
Damien Millerde6987c2002-01-22 23:20:40 +11001720 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001721 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001722 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001723 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001724 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001725 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001726 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001727}
1728
Ben Lindstrombba81212001-06-25 05:01:22 +00001729static void
Damien Millerb38eff82000-04-01 11:09:21 +10001730channel_handler_init_13(void)
1731{
1732 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1733 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1734 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1735 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1736 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1737 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1738 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001739 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001740 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001741
Damien Millerde6987c2002-01-22 23:20:40 +11001742 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001743 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1744 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1745 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1746 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001747 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001748 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001749}
1750
Ben Lindstrombba81212001-06-25 05:01:22 +00001751static void
Damien Millerb38eff82000-04-01 11:09:21 +10001752channel_handler_init_15(void)
1753{
Damien Millerde6987c2002-01-22 23:20:40 +11001754 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001755 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001756 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1757 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1758 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001759 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001760 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001761
1762 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1763 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1764 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11001765 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001766 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001767 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001768}
1769
Ben Lindstrombba81212001-06-25 05:01:22 +00001770static void
Damien Millerb38eff82000-04-01 11:09:21 +10001771channel_handler_init(void)
1772{
1773 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001774
Damien Miller9f0f5c62001-12-21 14:45:46 +11001775 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10001776 channel_pre[i] = NULL;
1777 channel_post[i] = NULL;
1778 }
Damien Miller33b13562000-04-04 14:38:59 +10001779 if (compat20)
1780 channel_handler_init_20();
1781 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001782 channel_handler_init_13();
1783 else
1784 channel_handler_init_15();
1785}
1786
Damien Miller3ec27592001-10-12 11:35:04 +10001787/* gc dead channels */
1788static void
1789channel_garbage_collect(Channel *c)
1790{
1791 if (c == NULL)
1792 return;
1793 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11001794 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10001795 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001796 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001797 c->detach_user(c->self, NULL);
1798 /* if we still have a callback */
1799 if (c->detach_user != NULL)
1800 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001801 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001802 }
1803 if (!chan_is_dead(c, 1))
1804 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10001805 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10001806 channel_free(c);
1807}
1808
Ben Lindstrombba81212001-06-25 05:01:22 +00001809static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001810channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001811{
1812 static int did_init = 0;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001813 u_int i;
Damien Millerb38eff82000-04-01 11:09:21 +10001814 Channel *c;
1815
1816 if (!did_init) {
1817 channel_handler_init();
1818 did_init = 1;
1819 }
1820 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001821 c = channels[i];
1822 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001823 continue;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001824 if (ftab[c->type] != NULL)
1825 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10001826 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001827 }
1828}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001829
Ben Lindstrome9c99912001-06-09 00:41:05 +00001830/*
1831 * Allocate/update select bitmasks and add any bits relevant to channels in
1832 * select bitmasks.
1833 */
Damien Miller4af51302000-04-16 11:18:38 +10001834void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001835channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001836 u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001837{
Damien Miller36812092006-03-26 14:22:47 +11001838 u_int n, sz, nfdset;
Damien Miller5e953212001-01-30 09:14:00 +11001839
1840 n = MAX(*maxfdp, channel_max_fd);
1841
Damien Miller36812092006-03-26 14:22:47 +11001842 nfdset = howmany(n+1, NFDBITS);
1843 /* Explicitly test here, because xrealloc isn't always called */
1844 if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask))
1845 fatal("channel_prepare_select: max_fd (%d) is too large", n);
1846 sz = nfdset * sizeof(fd_mask);
1847
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001848 /* perhaps check sz < nalloc/2 and shrink? */
1849 if (*readsetp == NULL || sz > *nallocp) {
Damien Miller36812092006-03-26 14:22:47 +11001850 *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask));
1851 *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask));
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001852 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11001853 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001854 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11001855 memset(*readsetp, 0, sz);
1856 memset(*writesetp, 0, sz);
1857
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001858 if (!rekeying)
1859 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001860}
1861
Ben Lindstrome9c99912001-06-09 00:41:05 +00001862/*
1863 * After select, perform any appropriate operations for channels which have
1864 * events pending.
1865 */
Damien Miller4af51302000-04-16 11:18:38 +10001866void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001867channel_after_select(fd_set *readset, fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001868{
Damien Millerb38eff82000-04-01 11:09:21 +10001869 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001870}
1871
Ben Lindstrome9c99912001-06-09 00:41:05 +00001872
Damien Miller5e953212001-01-30 09:14:00 +11001873/* If there is data to send to the connection, enqueue some of it now. */
Damien Miller4af51302000-04-16 11:18:38 +10001874void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00001875channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001876{
Damien Millerb38eff82000-04-01 11:09:21 +10001877 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10001878 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001879
Damien Miller95def091999-11-25 00:26:21 +11001880 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001881 c = channels[i];
1882 if (c == NULL)
1883 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001884
Ben Lindstrome9c99912001-06-09 00:41:05 +00001885 /*
1886 * We are only interested in channels that can have buffered
1887 * incoming data.
1888 */
Damien Miller34132e52000-01-14 15:45:46 +11001889 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001890 if (c->type != SSH_CHANNEL_OPEN &&
1891 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001892 continue;
1893 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001894 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001895 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001896 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001897 if (compat20 &&
1898 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001899 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10001900 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001901 continue;
1902 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001903
Damien Miller95def091999-11-25 00:26:21 +11001904 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001905 if ((c->istate == CHAN_INPUT_OPEN ||
1906 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1907 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11001908 if (c->datagram) {
1909 if (len > 0) {
1910 u_char *data;
1911 u_int dlen;
1912
1913 data = buffer_get_string(&c->input,
1914 &dlen);
1915 packet_start(SSH2_MSG_CHANNEL_DATA);
1916 packet_put_int(c->remote_id);
1917 packet_put_string(data, dlen);
1918 packet_send();
1919 c->remote_window -= dlen + 4;
1920 xfree(data);
1921 }
1922 continue;
1923 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00001924 /*
1925 * Send some data for the other side over the secure
1926 * connection.
1927 */
Damien Miller33b13562000-04-04 14:38:59 +10001928 if (compat20) {
1929 if (len > c->remote_window)
1930 len = c->remote_window;
1931 if (len > c->remote_maxpacket)
1932 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001933 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001934 if (packet_is_interactive()) {
1935 if (len > 1024)
1936 len = 512;
1937 } else {
1938 /* Keep the packets at reasonable size. */
1939 if (len > packet_get_maxsize()/2)
1940 len = packet_get_maxsize()/2;
1941 }
Damien Miller95def091999-11-25 00:26:21 +11001942 }
Damien Millerb38eff82000-04-01 11:09:21 +10001943 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001944 packet_start(compat20 ?
1945 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001946 packet_put_int(c->remote_id);
1947 packet_put_string(buffer_ptr(&c->input), len);
1948 packet_send();
1949 buffer_consume(&c->input, len);
1950 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001951 }
1952 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001953 if (compat13)
1954 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001955 /*
1956 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00001957 * tell peer, that we will not send more data: send IEOF.
1958 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11001959 */
Ben Lindstromcf159442002-03-26 03:26:24 +00001960 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10001961 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
1962 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00001963 else
1964 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001965 }
Damien Miller33b13562000-04-04 14:38:59 +10001966 /* Send extended data, i.e. stderr */
1967 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00001968 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10001969 c->remote_window > 0 &&
1970 (len = buffer_len(&c->extended)) > 0 &&
1971 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001972 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001973 c->self, c->remote_window, buffer_len(&c->extended),
1974 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001975 if (len > c->remote_window)
1976 len = c->remote_window;
1977 if (len > c->remote_maxpacket)
1978 len = c->remote_maxpacket;
1979 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1980 packet_put_int(c->remote_id);
1981 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1982 packet_put_string(buffer_ptr(&c->extended), len);
1983 packet_send();
1984 buffer_consume(&c->extended, len);
1985 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001986 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001987 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001988 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001989}
1990
Ben Lindstrome9c99912001-06-09 00:41:05 +00001991
1992/* -- protocol input */
Damien Millerd79b4242006-03-31 23:11:44 +11001993
1994/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10001995void
Damien Miller630d6f42002-01-22 23:17:30 +11001996channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001997{
Damien Miller34132e52000-01-14 15:45:46 +11001998 int id;
Damien Miller95def091999-11-25 00:26:21 +11001999 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00002000 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10002001 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002002
Damien Miller95def091999-11-25 00:26:21 +11002003 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11002004 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10002005 c = channel_lookup(id);
2006 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11002007 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002008
Damien Miller95def091999-11-25 00:26:21 +11002009 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10002010 if (c->type != SSH_CHANNEL_OPEN &&
2011 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002012 return;
2013
Damien Miller95def091999-11-25 00:26:21 +11002014 /* Get the data. */
2015 data = packet_get_string(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10002016
Damien Millera04ad492004-01-21 11:02:09 +11002017 /*
2018 * Ignore data for protocol > 1.3 if output end is no longer open.
2019 * For protocol 2 the sending side is reducing its window as it sends
2020 * data, so we must 'fake' consumption of the data in order to ensure
2021 * that window updates are sent back. Otherwise the connection might
2022 * deadlock.
2023 */
2024 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
2025 if (compat20) {
2026 c->local_window -= data_len;
2027 c->local_consumed += data_len;
2028 }
2029 xfree(data);
2030 return;
2031 }
2032
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002033 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10002034 if (data_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10002035 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller33b13562000-04-04 14:38:59 +10002036 c->self, data_len, c->local_maxpacket);
2037 }
2038 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002039 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002040 c->self, data_len, c->local_window);
2041 xfree(data);
2042 return;
2043 }
2044 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10002045 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002046 packet_check_eom();
Damien Millerd27b9472005-12-13 19:29:02 +11002047 if (c->datagram)
2048 buffer_put_string(&c->output, data, data_len);
2049 else
2050 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11002051 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002052}
Ben Lindstrome9c99912001-06-09 00:41:05 +00002053
Damien Millerd79b4242006-03-31 23:11:44 +11002054/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002055void
Damien Miller630d6f42002-01-22 23:17:30 +11002056channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002057{
2058 int id;
Damien Miller33b13562000-04-04 14:38:59 +10002059 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00002060 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10002061 Channel *c;
2062
2063 /* Get the channel number and verify it. */
2064 id = packet_get_int();
2065 c = channel_lookup(id);
2066
2067 if (c == NULL)
2068 packet_disconnect("Received extended_data for bad channel %d.", id);
2069 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002070 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10002071 return;
2072 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002073 if (c->flags & CHAN_EOF_RCVD) {
2074 if (datafellows & SSH_BUG_EXTEOF)
2075 debug("channel %d: accepting ext data after eof", id);
2076 else
2077 packet_disconnect("Received extended_data after EOF "
2078 "on channel %d.", id);
2079 }
Damien Miller33b13562000-04-04 14:38:59 +10002080 tcode = packet_get_int();
2081 if (c->efd == -1 ||
2082 c->extended_usage != CHAN_EXTENDED_WRITE ||
2083 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002084 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002085 return;
2086 }
2087 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002088 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002089 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002090 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002091 c->self, data_len, c->local_window);
2092 xfree(data);
2093 return;
2094 }
Damien Millerd3444942000-09-30 14:20:03 +11002095 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002096 c->local_window -= data_len;
2097 buffer_append(&c->extended, data, data_len);
2098 xfree(data);
2099}
2100
Damien Millerd79b4242006-03-31 23:11:44 +11002101/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002102void
Damien Miller630d6f42002-01-22 23:17:30 +11002103channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002104{
2105 int id;
2106 Channel *c;
2107
Damien Millerb38eff82000-04-01 11:09:21 +10002108 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002109 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002110 c = channel_lookup(id);
2111 if (c == NULL)
2112 packet_disconnect("Received ieof for nonexistent channel %d.", id);
2113 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002114
2115 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002116 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002117 debug("channel %d: FORCE input drain", c->self);
2118 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002119 if (buffer_len(&c->input) == 0)
2120 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002121 }
2122
Damien Millerb38eff82000-04-01 11:09:21 +10002123}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002124
Damien Millerd79b4242006-03-31 23:11:44 +11002125/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002126void
Damien Miller630d6f42002-01-22 23:17:30 +11002127channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002128{
Damien Millerb38eff82000-04-01 11:09:21 +10002129 int id;
2130 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002131
Damien Millerb38eff82000-04-01 11:09:21 +10002132 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002133 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002134 c = channel_lookup(id);
2135 if (c == NULL)
2136 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002137
2138 /*
2139 * Send a confirmation that we have closed the channel and no more
2140 * data is coming for it.
2141 */
Damien Miller95def091999-11-25 00:26:21 +11002142 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002143 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002144 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002145
Damien Miller5428f641999-11-25 11:54:57 +11002146 /*
2147 * If the channel is in closed state, we have sent a close request,
2148 * and the other side will eventually respond with a confirmation.
2149 * Thus, we cannot free the channel here, because then there would be
2150 * no-one to receive the confirmation. The channel gets freed when
2151 * the confirmation arrives.
2152 */
Damien Millerb38eff82000-04-01 11:09:21 +10002153 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002154 /*
2155 * Not a closed channel - mark it as draining, which will
2156 * cause it to be freed later.
2157 */
Damien Miller76765c02002-01-22 23:21:15 +11002158 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002159 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002160 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002161}
2162
Damien Millerb38eff82000-04-01 11:09:21 +10002163/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Millerd79b4242006-03-31 23:11:44 +11002164/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002165void
Damien Miller630d6f42002-01-22 23:17:30 +11002166channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002167{
Damien Millerb38eff82000-04-01 11:09:21 +10002168 int id = packet_get_int();
2169 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002170
Damien Miller48b03fc2002-01-22 23:11:40 +11002171 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002172 if (c == NULL)
2173 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2174 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002175}
2176
Damien Millerd79b4242006-03-31 23:11:44 +11002177/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002178void
Damien Miller630d6f42002-01-22 23:17:30 +11002179channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002180{
2181 int id = packet_get_int();
2182 Channel *c = channel_lookup(id);
2183
Damien Miller48b03fc2002-01-22 23:11:40 +11002184 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002185 if (c == NULL)
2186 packet_disconnect("Received close confirmation for "
2187 "out-of-range channel %d.", id);
2188 if (c->type != SSH_CHANNEL_CLOSED)
2189 packet_disconnect("Received close confirmation for "
2190 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002191 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002192}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002193
Damien Millerd79b4242006-03-31 23:11:44 +11002194/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002195void
Damien Miller630d6f42002-01-22 23:17:30 +11002196channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002197{
Damien Millerb38eff82000-04-01 11:09:21 +10002198 int id, remote_id;
2199 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002200
Damien Millerb38eff82000-04-01 11:09:21 +10002201 id = packet_get_int();
2202 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002203
Damien Millerb38eff82000-04-01 11:09:21 +10002204 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2205 packet_disconnect("Received open confirmation for "
2206 "non-opening channel %d.", id);
2207 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002208 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002209 c->remote_id = remote_id;
2210 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002211
2212 if (compat20) {
2213 c->remote_window = packet_get_int();
2214 c->remote_maxpacket = packet_get_int();
Damien Miller67f0bc02002-02-05 12:23:08 +11002215 if (c->confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002216 debug2("callback start");
Damien Miller0e220db2004-06-15 10:34:08 +10002217 c->confirm(c->self, c->confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002218 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002219 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002220 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002221 c->remote_window, c->remote_maxpacket);
2222 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002223 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002224}
2225
Ben Lindstrombba81212001-06-25 05:01:22 +00002226static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002227reason2txt(int reason)
2228{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002229 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002230 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2231 return "administratively prohibited";
2232 case SSH2_OPEN_CONNECT_FAILED:
2233 return "connect failed";
2234 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2235 return "unknown channel type";
2236 case SSH2_OPEN_RESOURCE_SHORTAGE:
2237 return "resource shortage";
2238 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002239 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002240}
2241
Damien Millerd79b4242006-03-31 23:11:44 +11002242/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002243void
Damien Miller630d6f42002-01-22 23:17:30 +11002244channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002245{
Kevin Steves12057502001-02-05 14:54:34 +00002246 int id, reason;
2247 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002248 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002249
Damien Millerb38eff82000-04-01 11:09:21 +10002250 id = packet_get_int();
2251 c = channel_lookup(id);
2252
2253 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2254 packet_disconnect("Received open failure for "
2255 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002256 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002257 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002258 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002259 msg = packet_get_string(NULL);
2260 lang = packet_get_string(NULL);
2261 }
Damien Miller996acd22003-04-09 20:59:48 +10002262 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002263 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002264 if (msg != NULL)
2265 xfree(msg);
2266 if (lang != NULL)
2267 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10002268 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002269 packet_check_eom();
Damien Miller95def091999-11-25 00:26:21 +11002270 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002271 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002272}
2273
Damien Millerd79b4242006-03-31 23:11:44 +11002274/* ARGSUSED */
Damien Miller33b13562000-04-04 14:38:59 +10002275void
Damien Miller630d6f42002-01-22 23:17:30 +11002276channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002277{
2278 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002279 int id;
2280 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002281
2282 if (!compat20)
2283 return;
2284
2285 /* Get the channel number and verify it. */
2286 id = packet_get_int();
2287 c = channel_lookup(id);
2288
Damien Millerd47c62a2005-12-13 19:33:57 +11002289 if (c == NULL) {
2290 logit("Received window adjust for non-open channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002291 return;
2292 }
2293 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002294 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002295 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002296 c->remote_window += adjust;
2297}
2298
Damien Millerd79b4242006-03-31 23:11:44 +11002299/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002300void
Damien Miller630d6f42002-01-22 23:17:30 +11002301channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002302{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002303 Channel *c = NULL;
2304 u_short host_port;
2305 char *host, *originator_string;
2306 int remote_id, sock = -1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002307
Ben Lindstrome9c99912001-06-09 00:41:05 +00002308 remote_id = packet_get_int();
2309 host = packet_get_string(NULL);
2310 host_port = packet_get_int();
2311
2312 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2313 originator_string = packet_get_string(NULL);
2314 } else {
2315 originator_string = xstrdup("unknown (remote did not supply name)");
2316 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002317 packet_check_eom();
Ben Lindstrome9c99912001-06-09 00:41:05 +00002318 sock = channel_connect_to(host, host_port);
2319 if (sock != -1) {
2320 c = channel_new("connected socket",
2321 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2322 originator_string, 1);
Damien Miller699d0032002-02-08 22:07:16 +11002323 c->remote_id = remote_id;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002324 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002325 xfree(originator_string);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002326 if (c == NULL) {
2327 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2328 packet_put_int(remote_id);
2329 packet_send();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002330 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002331 xfree(host);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002332}
2333
2334
Ben Lindstrome9c99912001-06-09 00:41:05 +00002335/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002336
Ben Lindstrom908afed2001-10-03 17:34:59 +00002337void
2338channel_set_af(int af)
2339{
2340 IPv4or6 = af;
2341}
2342
Damien Millerb16461c2002-01-22 23:29:22 +11002343static int
2344channel_setup_fwd_listener(int type, const char *listen_addr, u_short listen_port,
2345 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002346{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002347 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002348 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002349 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002350 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002351 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002352
Damien Millerb16461c2002-01-22 23:29:22 +11002353 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2354 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002355 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002356
Damien Millerb16461c2002-01-22 23:29:22 +11002357 if (host == NULL) {
2358 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002359 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002360 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002361 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00002362 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002363 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002364 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002365
Damien Miller5428f641999-11-25 11:54:57 +11002366 /*
Damien Millerf91ee4c2005-03-01 21:24:33 +11002367 * Determine whether or not a port forward listens to loopback,
Darren Tucker47eede72005-03-14 23:08:12 +11002368 * specified address or wildcard. On the client, a specified bind
2369 * address will always override gateway_ports. On the server, a
2370 * gateway_ports of 1 (``yes'') will override the client's
2371 * specification and force a wildcard bind, whereas a value of 2
2372 * (``clientspecified'') will bind to whatever address the client
Damien Millerf91ee4c2005-03-01 21:24:33 +11002373 * asked for.
2374 *
2375 * Special-case listen_addrs are:
2376 *
2377 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2378 * "" (empty string), "*" -> wildcard v4/v6
2379 * "localhost" -> loopback v4/v6
2380 */
2381 addr = NULL;
2382 if (listen_addr == NULL) {
2383 /* No address specified: default to gateway_ports setting */
2384 if (gateway_ports)
2385 wildcard = 1;
2386 } else if (gateway_ports || is_client) {
2387 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
2388 strcmp(listen_addr, "0.0.0.0") == 0) ||
2389 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2390 (!is_client && gateway_ports == 1))
2391 wildcard = 1;
2392 else if (strcmp(listen_addr, "localhost") != 0)
2393 addr = listen_addr;
2394 }
2395
2396 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2397 type, wildcard, (addr == NULL) ? "NULL" : addr);
2398
2399 /*
Damien Miller34132e52000-01-14 15:45:46 +11002400 * getaddrinfo returns a loopback address if the hostname is
2401 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002402 */
Damien Miller34132e52000-01-14 15:45:46 +11002403 memset(&hints, 0, sizeof(hints));
2404 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002405 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002406 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002407 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002408 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2409 if (addr == NULL) {
2410 /* This really shouldn't happen */
2411 packet_disconnect("getaddrinfo: fatal error: %s",
Darren Tucker4abde772007-12-29 02:43:51 +11002412 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002413 } else {
Damien Millera7270302005-07-06 09:36:05 +10002414 error("channel_setup_fwd_listener: "
Darren Tucker4abde772007-12-29 02:43:51 +11002415 "getaddrinfo(%.64s): %s", addr,
2416 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002417 }
Damien Millera7270302005-07-06 09:36:05 +10002418 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002419 }
Damien Miller5428f641999-11-25 11:54:57 +11002420
Damien Miller34132e52000-01-14 15:45:46 +11002421 for (ai = aitop; ai; ai = ai->ai_next) {
2422 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2423 continue;
2424 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2425 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002426 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002427 continue;
2428 }
2429 /* Create a port to listen for the host. */
Damien Miller2372ace2003-05-14 13:42:23 +10002430 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002431 if (sock < 0) {
2432 /* this is no error since kernel may not support ipv6 */
2433 verbose("socket: %.100s", strerror(errno));
2434 continue;
2435 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002436
2437 channel_set_reuseaddr(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002438
Damien Miller34132e52000-01-14 15:45:46 +11002439 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002440
Damien Miller34132e52000-01-14 15:45:46 +11002441 /* Bind the socket to the address. */
2442 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2443 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002444 if (!ai->ai_next)
2445 error("bind: %.100s", strerror(errno));
2446 else
2447 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002448
Damien Miller34132e52000-01-14 15:45:46 +11002449 close(sock);
2450 continue;
2451 }
2452 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002453 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002454 error("listen: %.100s", strerror(errno));
2455 close(sock);
2456 continue;
2457 }
2458 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002459 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002460 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002461 0, "port listener", 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002462 strlcpy(c->path, host, sizeof(c->path));
2463 c->host_port = port_to_connect;
2464 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002465 success = 1;
2466 }
2467 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002468 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002469 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002470 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002471 return success;
Damien Miller95def091999-11-25 00:26:21 +11002472}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002473
Darren Tuckere7066df2004-05-24 10:18:05 +10002474int
2475channel_cancel_rport_listener(const char *host, u_short port)
2476{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002477 u_int i;
2478 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002479
Darren Tucker47eede72005-03-14 23:08:12 +11002480 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002481 Channel *c = channels[i];
2482
2483 if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
2484 strncmp(c->path, host, sizeof(c->path)) == 0 &&
Darren Tuckerfc959702004-07-17 16:12:08 +10002485 c->listening_port == port) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002486 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002487 channel_free(c);
2488 found = 1;
2489 }
2490 }
2491
2492 return (found);
2493}
2494
Damien Millerb16461c2002-01-22 23:29:22 +11002495/* protocol local port fwd, used by ssh (and sshd in v1) */
2496int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002497channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002498 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2499{
2500 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002501 listen_host, listen_port, host_to_connect, port_to_connect,
2502 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002503}
2504
2505/* protocol v2 remote port fwd, used by sshd */
2506int
2507channel_setup_remote_fwd_listener(const char *listen_address,
2508 u_short listen_port, int gateway_ports)
2509{
2510 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
2511 listen_address, listen_port, NULL, 0, gateway_ports);
2512}
2513
Damien Miller5428f641999-11-25 11:54:57 +11002514/*
2515 * Initiate forwarding of connections to port "port" on remote host through
2516 * the secure channel to host:port from local side.
2517 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002518
Darren Tuckere7d4b192006-07-12 22:17:10 +10002519int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002520channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002521 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002522{
Damien Millerdff50992002-01-22 23:16:32 +11002523 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002524
Damien Miller95def091999-11-25 00:26:21 +11002525 /* Record locally that connection to this host/port is permitted. */
2526 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2527 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002528
Damien Miller95def091999-11-25 00:26:21 +11002529 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002530 if (compat20) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11002531 const char *address_to_bind;
Damien Miller1ec46262007-01-05 16:26:45 +11002532 if (listen_host == NULL) {
2533 if (datafellows & SSH_BUG_RFWD_ADDR)
2534 address_to_bind = "127.0.0.1";
2535 else
2536 address_to_bind = "localhost";
2537 } else if (*listen_host == '\0' ||
2538 strcmp(listen_host, "*") == 0) {
2539 if (datafellows & SSH_BUG_RFWD_ADDR)
2540 address_to_bind = "0.0.0.0";
2541 else
2542 address_to_bind = "";
2543 } else
Damien Millerf91ee4c2005-03-01 21:24:33 +11002544 address_to_bind = listen_host;
2545
Damien Miller33b13562000-04-04 14:38:59 +10002546 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2547 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002548 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002549 packet_put_cstring(address_to_bind);
2550 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002551 packet_send();
2552 packet_write_wait();
2553 /* Assume that server accepts the request */
2554 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002555 } else {
2556 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002557 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002558 packet_put_cstring(host_to_connect);
2559 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002560 packet_send();
2561 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002562
2563 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002564 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002565 switch (type) {
2566 case SSH_SMSG_SUCCESS:
2567 success = 1;
2568 break;
2569 case SSH_SMSG_FAILURE:
Damien Miller0bc1bd82000-11-13 22:57:25 +11002570 break;
2571 default:
2572 /* Unknown packet */
2573 packet_disconnect("Protocol error for port forward request:"
2574 "received packet type %d.", type);
2575 }
2576 }
2577 if (success) {
2578 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2579 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2580 permitted_opens[num_permitted_opens].listen_port = listen_port;
2581 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002582 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10002583 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002584}
2585
Damien Miller5428f641999-11-25 11:54:57 +11002586/*
Darren Tuckerfc959702004-07-17 16:12:08 +10002587 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10002588 * local side.
2589 */
Darren Tuckere7066df2004-05-24 10:18:05 +10002590void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002591channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10002592{
2593 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10002594
2595 if (!compat20)
2596 return;
2597
2598 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10002599 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10002600 permitted_opens[i].listen_port == port)
2601 break;
2602 }
2603 if (i >= num_permitted_opens) {
2604 debug("%s: requested forward not found", __func__);
2605 return;
2606 }
2607 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2608 packet_put_cstring("cancel-tcpip-forward");
2609 packet_put_char(0);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002610 packet_put_cstring(host == NULL ? "" : host);
Darren Tuckere7066df2004-05-24 10:18:05 +10002611 packet_put_int(port);
2612 packet_send();
2613
2614 permitted_opens[i].listen_port = 0;
2615 permitted_opens[i].port_to_connect = 0;
Damien Miller0a0176e2005-11-05 15:07:59 +11002616 xfree(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10002617 permitted_opens[i].host_to_connect = NULL;
2618}
2619
2620/*
Damien Miller5428f641999-11-25 11:54:57 +11002621 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2622 * listening for the port, and sends back a success reply (or disconnect
Darren Tuckere7d4b192006-07-12 22:17:10 +10002623 * message if there was an error).
Damien Miller5428f641999-11-25 11:54:57 +11002624 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10002625int
Damien Millere247cc42000-05-07 12:03:14 +10002626channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002627{
Damien Milleraae6c611999-12-06 11:47:28 +11002628 u_short port, host_port;
Darren Tuckere7d4b192006-07-12 22:17:10 +10002629 int success = 0;
Damien Miller95def091999-11-25 00:26:21 +11002630 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002631
Damien Miller95def091999-11-25 00:26:21 +11002632 /* Get arguments from the packet. */
2633 port = packet_get_int();
2634 hostname = packet_get_string(NULL);
2635 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002636
Damien Millerbac2d8a2000-09-05 16:13:06 +11002637#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002638 /*
2639 * Check that an unprivileged user is not trying to forward a
2640 * privileged port.
2641 */
Damien Miller95def091999-11-25 00:26:21 +11002642 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10002643 packet_disconnect(
2644 "Requested forwarding of port %d but user is not root.",
2645 port);
2646 if (host_port == 0)
2647 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11002648#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10002649
Damien Miller0bc1bd82000-11-13 22:57:25 +11002650 /* Initiate forwarding */
Darren Tuckere7d4b192006-07-12 22:17:10 +10002651 success = channel_setup_local_fwd_listener(NULL, port, hostname,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002652 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002653
2654 /* Free the argument string. */
2655 xfree(hostname);
Darren Tuckere7d4b192006-07-12 22:17:10 +10002656
2657 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002658}
2659
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002660/*
2661 * Permits opening to any host/port if permitted_opens[] is empty. This is
2662 * usually called by the server, because the user could connect to any port
2663 * anyway, and the server has no way to know but to trust the client anyway.
2664 */
2665void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002666channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002667{
2668 if (num_permitted_opens == 0)
2669 all_opens_permitted = 1;
2670}
2671
Ben Lindstroma3700052001-04-05 23:26:32 +00002672void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002673channel_add_permitted_opens(char *host, int port)
2674{
2675 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
Darren Tuckere7d4b192006-07-12 22:17:10 +10002676 fatal("channel_add_permitted_opens: too many forwards");
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002677 debug("allow port forwarding to host %s port %d", host, port);
2678
2679 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2680 permitted_opens[num_permitted_opens].port_to_connect = port;
2681 num_permitted_opens++;
2682
2683 all_opens_permitted = 0;
2684}
2685
Damien Millera765cf42006-07-24 14:08:13 +10002686int
Damien Miller9b439df2006-07-24 14:04:00 +10002687channel_add_adm_permitted_opens(char *host, int port)
2688{
2689 if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2690 fatal("channel_add_adm_permitted_opens: too many forwards");
Damien Millera765cf42006-07-24 14:08:13 +10002691 debug("config allows port forwarding to host %s port %d", host, port);
Damien Miller9b439df2006-07-24 14:04:00 +10002692
2693 permitted_adm_opens[num_adm_permitted_opens].host_to_connect
2694 = xstrdup(host);
2695 permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
Damien Millera765cf42006-07-24 14:08:13 +10002696 return ++num_adm_permitted_opens;
Damien Miller9b439df2006-07-24 14:04:00 +10002697}
2698
2699void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002700channel_clear_permitted_opens(void)
2701{
2702 int i;
2703
2704 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002705 if (permitted_opens[i].host_to_connect != NULL)
2706 xfree(permitted_opens[i].host_to_connect);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002707 num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +10002708}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002709
Damien Miller9b439df2006-07-24 14:04:00 +10002710void
2711channel_clear_adm_permitted_opens(void)
2712{
2713 int i;
2714
2715 for (i = 0; i < num_adm_permitted_opens; i++)
2716 if (permitted_adm_opens[i].host_to_connect != NULL)
2717 xfree(permitted_adm_opens[i].host_to_connect);
2718 num_adm_permitted_opens = 0;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002719}
2720
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002721/* return socket to remote host, port */
Ben Lindstrombba81212001-06-25 05:01:22 +00002722static int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002723connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002724{
Damien Miller34132e52000-01-14 15:45:46 +11002725 struct addrinfo hints, *ai, *aitop;
2726 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2727 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002728 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002729
Damien Miller34132e52000-01-14 15:45:46 +11002730 memset(&hints, 0, sizeof(hints));
2731 hints.ai_family = IPv4or6;
2732 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002733 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002734 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002735 error("connect_to %.100s: unknown host (%s)", host,
Darren Tucker4abde772007-12-29 02:43:51 +11002736 ssh_gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002737 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002738 }
Damien Miller34132e52000-01-14 15:45:46 +11002739 for (ai = aitop; ai; ai = ai->ai_next) {
2740 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2741 continue;
2742 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2743 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002744 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002745 continue;
2746 }
Damien Miller2372ace2003-05-14 13:42:23 +10002747 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002748 if (sock < 0) {
Damien Millerb46b9f32003-01-10 21:45:12 +11002749 if (ai->ai_next == NULL)
2750 error("socket: %.100s", strerror(errno));
2751 else
2752 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002753 continue;
2754 }
Damien Miller232711f2004-06-15 10:35:30 +10002755 if (set_nonblock(sock) == -1)
2756 fatal("%s: set_nonblock(%d)", __func__, sock);
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002757 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2758 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002759 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002760 strerror(errno));
2761 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002762 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002763 }
2764 break; /* success */
2765
2766 }
2767 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002768 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002769 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002770 return -1;
2771 }
2772 /* success */
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00002773 set_nodelay(sock);
Damien Millerb38eff82000-04-01 11:09:21 +10002774 return sock;
2775}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002776
Damien Miller0bc1bd82000-11-13 22:57:25 +11002777int
Ben Lindstrom173e6462001-07-04 05:15:15 +00002778channel_connect_by_listen_address(u_short listen_port)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002779{
2780 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002781
Damien Miller0bc1bd82000-11-13 22:57:25 +11002782 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002783 if (permitted_opens[i].host_to_connect != NULL &&
2784 permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002785 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002786 permitted_opens[i].host_to_connect,
2787 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002788 error("WARNING: Server requests forwarding for unknown listen_port %d",
2789 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002790 return -1;
2791}
Damien Millerb38eff82000-04-01 11:09:21 +10002792
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002793/* Check if connecting to that port is permitted and connect. */
2794int
2795channel_connect_to(const char *host, u_short port)
2796{
Damien Miller9b439df2006-07-24 14:04:00 +10002797 int i, permit, permit_adm = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002798
2799 permit = all_opens_permitted;
2800 if (!permit) {
2801 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10002802 if (permitted_opens[i].host_to_connect != NULL &&
2803 permitted_opens[i].port_to_connect == port &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002804 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2805 permit = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002806 }
Damien Miller9b439df2006-07-24 14:04:00 +10002807
2808 if (num_adm_permitted_opens > 0) {
2809 permit_adm = 0;
2810 for (i = 0; i < num_adm_permitted_opens; i++)
2811 if (permitted_adm_opens[i].host_to_connect != NULL &&
2812 permitted_adm_opens[i].port_to_connect == port &&
2813 strcmp(permitted_adm_opens[i].host_to_connect, host)
2814 == 0)
2815 permit_adm = 1;
2816 }
2817
2818 if (!permit || !permit_adm) {
Damien Miller996acd22003-04-09 20:59:48 +10002819 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002820 "but the request was denied.", host, port);
2821 return -1;
2822 }
2823 return connect_to(host, port);
2824}
2825
Damien Miller0e220db2004-06-15 10:34:08 +10002826void
2827channel_send_window_changes(void)
2828{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002829 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10002830 struct winsize ws;
2831
2832 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11002833 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10002834 channels[i]->type != SSH_CHANNEL_OPEN)
2835 continue;
2836 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
2837 continue;
2838 channel_request_start(i, "window-change", 0);
Damien Miller71a73672006-03-26 14:04:36 +11002839 packet_put_int((u_int)ws.ws_col);
2840 packet_put_int((u_int)ws.ws_row);
2841 packet_put_int((u_int)ws.ws_xpixel);
2842 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10002843 packet_send();
2844 }
2845}
2846
Ben Lindstrome9c99912001-06-09 00:41:05 +00002847/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002848
Damien Miller5428f641999-11-25 11:54:57 +11002849/*
2850 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002851 * Returns 0 and a suitable display number for the DISPLAY variable
2852 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11002853 */
Kevin Steves366298c2001-12-19 17:58:01 +00002854int
Damien Miller95c249f2002-02-05 12:11:34 +11002855x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10002856 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002857{
Damien Millere7378562001-12-21 14:58:35 +11002858 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11002859 int display_number, sock;
2860 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002861 struct addrinfo hints, *ai, *aitop;
2862 char strport[NI_MAXSERV];
2863 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002864
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002865 if (chanids == NULL)
2866 return -1;
2867
Damien Millera34a28b1999-12-14 10:47:15 +11002868 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11002869 display_number < MAX_DISPLAYS;
2870 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11002871 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002872 memset(&hints, 0, sizeof(hints));
2873 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11002874 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11002875 hints.ai_socktype = SOCK_STREAM;
2876 snprintf(strport, sizeof strport, "%d", port);
2877 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11002878 error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00002879 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002880 }
Damien Miller34132e52000-01-14 15:45:46 +11002881 for (ai = aitop; ai; ai = ai->ai_next) {
2882 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2883 continue;
Damien Miller2372ace2003-05-14 13:42:23 +10002884 sock = socket(ai->ai_family, ai->ai_socktype,
2885 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002886 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002887 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002888 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10002889 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00002890 return -1;
Damien Millere2192732000-01-17 13:22:55 +11002891 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002892 debug("x11_create_display_inet: Socket family %d not supported",
2893 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002894 continue;
2895 }
Damien Miller34132e52000-01-14 15:45:46 +11002896 }
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002897#ifdef IPV6_V6ONLY
2898 if (ai->ai_family == AF_INET6) {
2899 int on = 1;
2900 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) < 0)
2901 error("setsockopt IPV6_V6ONLY: %.100s", strerror(errno));
2902 }
2903#endif
Damien Miller5e7fd072005-11-05 14:53:39 +11002904 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11002905 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10002906 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002907 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002908
2909 if (ai->ai_next)
2910 continue;
2911
Damien Miller34132e52000-01-14 15:45:46 +11002912 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11002913 close(socks[n]);
2914 }
2915 num_socks = 0;
2916 break;
2917 }
2918 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002919#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002920 if (num_socks == NUM_SOCKS)
2921 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002922#else
Kevin Stevesdf75dd22002-06-04 20:52:19 +00002923 if (x11_use_localhost) {
2924 if (num_socks == NUM_SOCKS)
2925 break;
2926 } else {
2927 break;
2928 }
Damien Miller7bcb0892000-03-11 20:45:40 +11002929#endif
Damien Miller95def091999-11-25 00:26:21 +11002930 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002931 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002932 if (num_socks > 0)
2933 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002934 }
Damien Miller95def091999-11-25 00:26:21 +11002935 if (display_number >= MAX_DISPLAYS) {
2936 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00002937 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002938 }
Damien Miller95def091999-11-25 00:26:21 +11002939 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002940 for (n = 0; n < num_socks; n++) {
2941 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11002942 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002943 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11002944 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00002945 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11002946 }
Damien Miller95def091999-11-25 00:26:21 +11002947 }
Damien Miller34132e52000-01-14 15:45:46 +11002948
Damien Miller34132e52000-01-14 15:45:46 +11002949 /* Allocate a channel for each socket. */
Damien Miller07d86be2006-03-26 14:19:21 +11002950 *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
Damien Miller34132e52000-01-14 15:45:46 +11002951 for (n = 0; n < num_socks; n++) {
2952 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11002953 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10002954 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2955 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002956 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11002957 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002958 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11002959 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10002960 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002961
Kevin Steves366298c2001-12-19 17:58:01 +00002962 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00002963 *display_numberp = display_number;
2964 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002965}
2966
Ben Lindstrombba81212001-06-25 05:01:22 +00002967static int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002968connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002969{
Damien Miller95def091999-11-25 00:26:21 +11002970 int sock;
2971 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002972
Damien Miller3afe3752001-12-21 12:39:51 +11002973 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2974 if (sock < 0)
2975 error("socket: %.100s", strerror(errno));
2976 memset(&addr, 0, sizeof(addr));
2977 addr.sun_family = AF_UNIX;
2978 snprintf(addr.sun_path, sizeof addr.sun_path, _PATH_UNIX_X, dnr);
Damien Miller90967402006-03-26 14:07:26 +11002979 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
Damien Miller3afe3752001-12-21 12:39:51 +11002980 return sock;
2981 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11002982 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2983 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002984}
2985
Damien Millerbd483e72000-04-30 10:00:53 +10002986int
2987x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002988{
Damien Miller57c4e872006-03-31 23:11:07 +11002989 u_int display_number;
Damien Miller95def091999-11-25 00:26:21 +11002990 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002991 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002992 struct addrinfo hints, *ai, *aitop;
2993 char strport[NI_MAXSERV];
Damien Miller57c4e872006-03-31 23:11:07 +11002994 int gaierr, sock = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002995
Damien Miller95def091999-11-25 00:26:21 +11002996 /* Try to open a socket for the local X server. */
2997 display = getenv("DISPLAY");
2998 if (!display) {
2999 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10003000 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003001 }
Damien Miller5428f641999-11-25 11:54:57 +11003002 /*
3003 * Now we decode the value of the DISPLAY variable and make a
3004 * connection to the real X server.
3005 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003006
Damien Miller5428f641999-11-25 11:54:57 +11003007 /*
3008 * Check if it is a unix domain socket. Unix domain displays are in
3009 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
3010 */
Damien Miller95def091999-11-25 00:26:21 +11003011 if (strncmp(display, "unix:", 5) == 0 ||
3012 display[0] == ':') {
3013 /* Connect to the unix domain socket. */
Damien Miller57c4e872006-03-31 23:11:07 +11003014 if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003015 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003016 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003017 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003018 }
3019 /* Create a socket. */
3020 sock = connect_local_xsocket(display_number);
3021 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10003022 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003023
3024 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10003025 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003026 }
Damien Miller5428f641999-11-25 11:54:57 +11003027 /*
3028 * Connect to an inet socket. The DISPLAY value is supposedly
3029 * hostname:d[.s], where hostname may also be numeric IP address.
3030 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00003031 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11003032 cp = strchr(buf, ':');
3033 if (!cp) {
3034 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10003035 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003036 }
Damien Miller95def091999-11-25 00:26:21 +11003037 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11003038 /* buf now contains the host name. But first we parse the display number. */
Damien Miller57c4e872006-03-31 23:11:07 +11003039 if (sscanf(cp + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003040 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003041 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003042 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003043 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003044
Damien Miller34132e52000-01-14 15:45:46 +11003045 /* Look up the host address */
3046 memset(&hints, 0, sizeof(hints));
3047 hints.ai_family = IPv4or6;
3048 hints.ai_socktype = SOCK_STREAM;
Damien Miller57c4e872006-03-31 23:11:07 +11003049 snprintf(strport, sizeof strport, "%u", 6000 + display_number);
Damien Miller34132e52000-01-14 15:45:46 +11003050 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003051 error("%.100s: unknown host. (%s)", buf,
3052 ssh_gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10003053 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003054 }
Damien Miller34132e52000-01-14 15:45:46 +11003055 for (ai = aitop; ai; ai = ai->ai_next) {
3056 /* Create a socket. */
Damien Miller2372ace2003-05-14 13:42:23 +10003057 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003058 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003059 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10003060 continue;
3061 }
3062 /* Connect it to the display. */
3063 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Miller57c4e872006-03-31 23:11:07 +11003064 debug2("connect %.100s port %u: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10003065 6000 + display_number, strerror(errno));
3066 close(sock);
3067 continue;
3068 }
3069 /* Success */
3070 break;
Damien Miller34132e52000-01-14 15:45:46 +11003071 }
Damien Miller34132e52000-01-14 15:45:46 +11003072 freeaddrinfo(aitop);
3073 if (!ai) {
Damien Miller57c4e872006-03-31 23:11:07 +11003074 error("connect %.100s port %u: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11003075 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10003076 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003077 }
Damien Miller398e1cf2002-02-05 11:52:13 +11003078 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10003079 return sock;
3080}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003081
Damien Millerbd483e72000-04-30 10:00:53 +10003082/*
3083 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
3084 * the remote channel number. We should do whatever we want, and respond
3085 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
3086 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003087
Damien Miller8473dd82006-07-24 14:08:32 +10003088/* ARGSUSED */
Damien Millerbd483e72000-04-30 10:00:53 +10003089void
Damien Miller630d6f42002-01-22 23:17:30 +11003090x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10003091{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003092 Channel *c = NULL;
3093 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10003094 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10003095
3096 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003097
3098 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00003099
3100 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003101 remote_host = packet_get_string(NULL);
3102 } else {
3103 remote_host = xstrdup("unknown (remote did not supply name)");
3104 }
Damien Miller48b03fc2002-01-22 23:11:40 +11003105 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10003106
3107 /* Obtain a connection to the real X display. */
3108 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003109 if (sock != -1) {
3110 /* Allocate a channel for this connection. */
3111 c = channel_new("connected x11 socket",
3112 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3113 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11003114 c->remote_id = remote_id;
3115 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003116 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003117 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003118 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10003119 /* Send refusal to the remote host. */
3120 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003121 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10003122 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10003123 /* Send a confirmation to the remote host. */
3124 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003125 packet_put_int(remote_id);
3126 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10003127 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003128 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003129}
3130
Damien Miller69b69aa2000-10-28 14:19:58 +11003131/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
Damien Miller8473dd82006-07-24 14:08:32 +10003132/* ARGSUSED */
Damien Miller69b69aa2000-10-28 14:19:58 +11003133void
Damien Miller630d6f42002-01-22 23:17:30 +11003134deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11003135{
3136 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00003137
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00003138 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11003139 case SSH_SMSG_AGENT_OPEN:
3140 error("Warning: ssh server tried agent forwarding.");
3141 break;
3142 case SSH_SMSG_X11_OPEN:
3143 error("Warning: ssh server tried X11 forwarding.");
3144 break;
3145 default:
Damien Miller630d6f42002-01-22 23:17:30 +11003146 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11003147 break;
3148 }
Damien Miller5eb137c2005-12-31 16:19:53 +11003149 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11003150 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3151 packet_put_int(rchan);
3152 packet_send();
3153}
3154
Damien Miller5428f641999-11-25 11:54:57 +11003155/*
3156 * Requests forwarding of X11 connections, generates fake authentication
3157 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00003158 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11003159 */
Damien Miller4af51302000-04-16 11:18:38 +10003160void
Damien Miller17e7ed02005-06-17 12:54:33 +10003161x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Millerbd483e72000-04-30 10:00:53 +10003162 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003163{
Ben Lindstrom46c16222000-12-22 01:43:59 +00003164 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10003165 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11003166 char *new_data;
3167 int screen_number;
3168 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10003169 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003170
Damien Millerf92c0792005-07-06 09:45:26 +10003171 if (x11_saved_display == NULL)
3172 x11_saved_display = xstrdup(disp);
3173 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10003174 error("x11_request_forwarding_with_spoofing: different "
3175 "$DISPLAY already forwarded");
3176 return;
3177 }
3178
Damien Millerd5fe0ba2006-08-30 11:07:39 +10003179 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11003180 if (cp)
3181 cp = strchr(cp, '.');
3182 if (cp)
Damien Miller08d61502006-03-26 14:28:32 +11003183 screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
Damien Miller95def091999-11-25 00:26:21 +11003184 else
3185 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003186
Damien Miller13390022005-07-06 09:44:19 +10003187 if (x11_saved_proto == NULL) {
3188 /* Save protocol name. */
3189 x11_saved_proto = xstrdup(proto);
3190 /*
Damien Miller46d38de2005-07-17 17:02:09 +10003191 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10003192 * of the same length.
3193 */
3194 x11_saved_data = xmalloc(data_len);
3195 x11_fake_data = xmalloc(data_len);
3196 for (i = 0; i < data_len; i++) {
3197 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3198 fatal("x11_request_forwarding: bad "
3199 "authentication data: %.100s", data);
3200 if (i % 4 == 0)
3201 rnd = arc4random();
3202 x11_saved_data[i] = value;
3203 x11_fake_data[i] = rnd & 0xff;
3204 rnd >>= 8;
3205 }
3206 x11_saved_data_len = data_len;
3207 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003208 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003209
Damien Miller95def091999-11-25 00:26:21 +11003210 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003211 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003212
Damien Miller95def091999-11-25 00:26:21 +11003213 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003214 if (compat20) {
3215 channel_request_start(client_session_id, "x11-req", 0);
3216 packet_put_char(0); /* XXX bool single connection */
3217 } else {
3218 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3219 }
3220 packet_put_cstring(proto);
3221 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003222 packet_put_int(screen_number);
3223 packet_send();
3224 packet_write_wait();
3225 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003226}
3227
Ben Lindstrome9c99912001-06-09 00:41:05 +00003228
3229/* -- agent forwarding */
3230
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003231/* Sends a message to the server to request authentication fd forwarding. */
3232
Damien Miller4af51302000-04-16 11:18:38 +10003233void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003234auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003235{
Damien Miller95def091999-11-25 00:26:21 +11003236 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3237 packet_send();
3238 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003239}