blob: 0f750c4d4b4852264bd631a2e994d5b937e814db [file] [log] [blame]
Damien Millerd530f5f2010-05-21 14:57:10 +10001/* $OpenBSD: channels.c,v 1.304 2010/05/14 23:29:23 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * This file contains functions for generic socket connection forwarding.
7 * There is also code for initiating connection forwarding for X11 connections,
8 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10009 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
Damien Miller33b13562000-04-04 14:38:59 +100016 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110017 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 * Copyright (c) 1999 Dug Song. All rights reserved.
19 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110040 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110043
Damien Miller574c41f2006-03-15 11:40:10 +110044#include <sys/types.h>
Damien Millerd7834352006-08-05 12:39:39 +100045#include <sys/ioctl.h>
Damien Miller574c41f2006-03-15 11:40:10 +110046#include <sys/un.h>
Damien Millerefc04e72006-07-10 20:26:27 +100047#include <sys/socket.h>
Damien Miller9aec9192006-08-05 10:57:45 +100048#ifdef HAVE_SYS_TIME_H
49# include <sys/time.h>
50#endif
Damien Millerefc04e72006-07-10 20:26:27 +100051
52#include <netinet/in.h>
53#include <arpa/inet.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110054
Darren Tucker39972492006-07-12 22:22:46 +100055#include <errno.h>
Darren Tucker6e7fe1c2010-01-08 17:07:22 +110056#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100057#include <netdb.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100058#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100059#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100060#include <string.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110061#include <termios.h>
Damien Millere6b3b612006-07-24 14:01:23 +100062#include <unistd.h>
Damien Millerd7834352006-08-05 12:39:39 +100063#include <stdarg.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064
Damien Millerb84886b2008-05-19 15:05:07 +100065#include "openbsd-compat/sys-queue.h"
Damien Millerd7834352006-08-05 12:39:39 +100066#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100067#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000068#include "ssh1.h"
69#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100070#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000071#include "log.h"
72#include "misc.h"
Damien Millerd7834352006-08-05 12:39:39 +100073#include "buffer.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100074#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000076#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100077#include "key.h"
78#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110079#include "pathnames.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080
Ben Lindstrome9c99912001-06-09 00:41:05 +000081/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100082
Damien Miller5428f641999-11-25 11:54:57 +110083/*
84 * Pointer to an array containing all allocated channels. The array is
85 * dynamically extended as needed.
86 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000087static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100088
Damien Miller5428f641999-11-25 11:54:57 +110089/*
90 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000091 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110092 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100093static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094
Damien Miller5428f641999-11-25 11:54:57 +110095/*
96 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000097 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110098 */
Damien Miller5e953212001-01-30 09:14:00 +110099static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000101
Ben Lindstrome9c99912001-06-09 00:41:05 +0000102/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000103
Damien Miller5428f641999-11-25 11:54:57 +1100104/*
105 * Data structure for storing which hosts are permitted for forward requests.
106 * The local sides of any remote forwards are stored in this array to prevent
107 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
108 * network (which might be behind a firewall).
109 */
Damien Miller95def091999-11-25 00:26:21 +1100110typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +1000111 char *host_to_connect; /* Connect to 'host'. */
112 u_short port_to_connect; /* Connect to 'port'. */
113 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000114} ForwardPermission;
115
Damien Miller9b439df2006-07-24 14:04:00 +1000116/* List of all permitted host/port pairs to connect by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000117static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
Ben Lindstrome9c99912001-06-09 00:41:05 +0000118
Damien Miller9b439df2006-07-24 14:04:00 +1000119/* List of all permitted host/port pairs to connect by the admin. */
120static ForwardPermission permitted_adm_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
121
122/* Number of permitted host/port pairs in the array permitted by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000123static int num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +1000124
125/* Number of permitted host/port pair in the array permitted by the admin. */
126static int num_adm_permitted_opens = 0;
127
Damien Miller5428f641999-11-25 11:54:57 +1100128/*
129 * If this is true, all opens are permitted. This is the case on the server
130 * on which we have to trust the client anyway, and the user could do
131 * anything after logging in anyway.
132 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000133static int all_opens_permitted = 0;
134
Ben Lindstrome9c99912001-06-09 00:41:05 +0000135
136/* -- X11 forwarding */
137
138/* Maximum number of fake X11 displays to try. */
139#define MAX_DISPLAYS 1000
140
Damien Miller13390022005-07-06 09:44:19 +1000141/* Saved X11 local (client) display. */
142static char *x11_saved_display = NULL;
143
Ben Lindstrome9c99912001-06-09 00:41:05 +0000144/* Saved X11 authentication protocol name. */
145static char *x11_saved_proto = NULL;
146
147/* Saved X11 authentication data. This is the real data. */
148static char *x11_saved_data = NULL;
149static u_int x11_saved_data_len = 0;
150
151/*
152 * Fake X11 authentication data. This is what the server will be sending us;
153 * we should replace any occurrences of this by the real data.
154 */
Damien Miller4ae97f12006-03-26 14:08:10 +1100155static u_char *x11_fake_data = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000156static u_int x11_fake_data_len;
157
158
159/* -- agent forwarding */
160
161#define NUM_SOCKS 10
162
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000163/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000164static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000165
Ben Lindstrome9c99912001-06-09 00:41:05 +0000166/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000167static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000168
Damien Millerbd740252008-05-19 15:37:09 +1000169/* non-blocking connect helpers */
170static int connect_next(struct channel_connect *);
171static void channel_connect_ctx_free(struct channel_connect *);
172
Ben Lindstrome9c99912001-06-09 00:41:05 +0000173/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000174
175Channel *
Damien Millerd47c62a2005-12-13 19:33:57 +1100176channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000177{
178 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000179
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000180 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100181 logit("channel_by_id: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000182 return NULL;
183 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000184 c = channels[id];
185 if (c == NULL) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100186 logit("channel_by_id: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000187 return NULL;
188 }
189 return c;
190}
191
Damien Miller5428f641999-11-25 11:54:57 +1100192/*
Damien Millerd47c62a2005-12-13 19:33:57 +1100193 * Returns the channel if it is allowed to receive protocol messages.
194 * Private channels, like listening sockets, may not receive messages.
195 */
196Channel *
197channel_lookup(int id)
198{
199 Channel *c;
200
201 if ((c = channel_by_id(id)) == NULL)
202 return (NULL);
203
Damien Millerd62f2ca2006-03-26 13:57:41 +1100204 switch (c->type) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100205 case SSH_CHANNEL_X11_OPEN:
206 case SSH_CHANNEL_LARVAL:
207 case SSH_CHANNEL_CONNECTING:
208 case SSH_CHANNEL_DYNAMIC:
209 case SSH_CHANNEL_OPENING:
210 case SSH_CHANNEL_OPEN:
211 case SSH_CHANNEL_INPUT_DRAINING:
212 case SSH_CHANNEL_OUTPUT_DRAINING:
213 return (c);
Damien Millerd47c62a2005-12-13 19:33:57 +1100214 }
215 logit("Non-public channel %d, type %d.", id, c->type);
216 return (NULL);
217}
218
219/*
Damien Millere247cc42000-05-07 12:03:14 +1000220 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000221 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100222 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000223static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100224channel_register_fds(Channel *c, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000225 int extusage, int nonblock, int is_tty)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000226{
Damien Miller95def091999-11-25 00:26:21 +1100227 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100228 channel_max_fd = MAX(channel_max_fd, rfd);
229 channel_max_fd = MAX(channel_max_fd, wfd);
230 channel_max_fd = MAX(channel_max_fd, efd);
231
Darren Tucker6e7fe1c2010-01-08 17:07:22 +1100232 if (rfd != -1)
233 fcntl(rfd, F_SETFD, FD_CLOEXEC);
234 if (wfd != -1 && wfd != rfd)
235 fcntl(wfd, F_SETFD, FD_CLOEXEC);
236 if (efd != -1 && efd != rfd && efd != wfd)
237 fcntl(efd, F_SETFD, FD_CLOEXEC);
Damien Millere247cc42000-05-07 12:03:14 +1000238
Damien Miller6f83b8e2000-05-02 09:23:45 +1000239 c->rfd = rfd;
240 c->wfd = wfd;
241 c->sock = (rfd == wfd) ? rfd : -1;
242 c->efd = efd;
243 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100244
Darren Tuckered3cdc02008-06-16 23:29:18 +1000245 if ((c->isatty = is_tty) != 0)
Damien Millerfbdeece2003-09-02 22:52:31 +1000246 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Darren Tucker1a48aec2008-06-16 23:35:56 +1000247 c->wfd_isatty = is_tty || isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100248
Damien Miller69b69aa2000-10-28 14:19:58 +1100249 /* enable nonblocking mode */
250 if (nonblock) {
251 if (rfd != -1)
252 set_nonblock(rfd);
253 if (wfd != -1)
254 set_nonblock(wfd);
255 if (efd != -1)
256 set_nonblock(efd);
257 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000258}
259
260/*
261 * Allocate a new channel object and set its type and socket. This will cause
262 * remote_name to be freed.
263 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000264Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000265channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000266 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000267{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000268 int found;
269 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000270 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000271
Damien Miller95def091999-11-25 00:26:21 +1100272 /* Do initial allocation if this is the first call. */
273 if (channels_alloc == 0) {
274 channels_alloc = 10;
Damien Miller07d86be2006-03-26 14:19:21 +1100275 channels = xcalloc(channels_alloc, sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100276 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000277 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100278 }
279 /* Try to find a free slot where to put the new channel. */
280 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000281 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100282 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000283 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100284 break;
285 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000286 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100287 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100288 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000289 if (channels_alloc > 10000)
290 fatal("channel_new: internal error: channels_alloc %d "
291 "too big.", channels_alloc);
Damien Miller36812092006-03-26 14:22:47 +1100292 channels = xrealloc(channels, channels_alloc + 10,
293 sizeof(Channel *));
Damien Miller5efcecc2003-09-17 07:31:14 +1000294 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100295 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100296 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000297 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100298 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000299 /* Initialize and return new channel. */
Damien Miller07d86be2006-03-26 14:19:21 +1100300 c = channels[found] = xcalloc(1, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100301 buffer_init(&c->input);
302 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000303 buffer_init(&c->extended);
Damien Millera1c1b6c2009-01-28 16:29:49 +1100304 c->path = NULL;
Damien Miller5144df92002-01-22 23:28:45 +1100305 c->ostate = CHAN_OUTPUT_OPEN;
306 c->istate = CHAN_INPUT_OPEN;
307 c->flags = 0;
Damien Millerd310d512008-06-16 07:59:23 +1000308 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0);
Damien Miller95def091999-11-25 00:26:21 +1100309 c->self = found;
310 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000311 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000312 c->local_window = window;
313 c->local_window_max = window;
314 c->local_consumed = 0;
315 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100316 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000317 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000318 c->remote_window = 0;
319 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000320 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100321 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000322 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100323 c->detach_close = 0;
Damien Millerb84886b2008-05-19 15:05:07 +1000324 c->open_confirm = NULL;
325 c->open_confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000326 c->input_filter = NULL;
Damien Miller077b2382005-12-31 16:22:32 +1100327 c->output_filter = NULL;
Darren Tucker84c56f52008-06-13 04:55:46 +1000328 c->filter_ctx = NULL;
329 c->filter_cleanup = NULL;
Damien Millere1537f92010-01-26 13:26:22 +1100330 c->ctl_chan = -1;
331 c->mux_rcb = NULL;
332 c->mux_ctx = NULL;
Damien Millerd530f5f2010-05-21 14:57:10 +1000333 c->mux_pause = 0;
Darren Tucker876045b2010-01-08 17:08:00 +1100334 c->delayed = 1; /* prevent call to channel_post handler */
Damien Millerb84886b2008-05-19 15:05:07 +1000335 TAILQ_INIT(&c->status_confirms);
Damien Miller95def091999-11-25 00:26:21 +1100336 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000337 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000338}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000339
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000340static int
341channel_find_maxfd(void)
342{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000343 u_int i;
344 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000345 Channel *c;
346
347 for (i = 0; i < channels_alloc; i++) {
348 c = channels[i];
349 if (c != NULL) {
350 max = MAX(max, c->rfd);
351 max = MAX(max, c->wfd);
352 max = MAX(max, c->efd);
353 }
354 }
355 return max;
356}
357
358int
359channel_close_fd(int *fdp)
360{
361 int ret = 0, fd = *fdp;
362
363 if (fd != -1) {
364 ret = close(fd);
365 *fdp = -1;
366 if (fd == channel_max_fd)
367 channel_max_fd = channel_find_maxfd();
368 }
369 return ret;
370}
371
Damien Miller6f83b8e2000-05-02 09:23:45 +1000372/* Close all channel fd/socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000373static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000374channel_close_fds(Channel *c)
375{
Damien Millere1537f92010-01-26 13:26:22 +1100376 debug3("channel %d: close_fds r %d w %d e %d",
377 c->self, c->rfd, c->wfd, c->efd);
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000378
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000379 channel_close_fd(&c->sock);
380 channel_close_fd(&c->rfd);
381 channel_close_fd(&c->wfd);
382 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000383}
384
385/* Free the channel and close its fd/socket. */
Damien Miller4af51302000-04-16 11:18:38 +1000386void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000387channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000388{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000389 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000390 u_int i, n;
Damien Millerb84886b2008-05-19 15:05:07 +1000391 struct channel_confirm *cc;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000392
393 for (n = 0, i = 0; i < channels_alloc; i++)
394 if (channels[i])
395 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000396 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000397 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000398
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000399 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000400 debug3("channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000401 xfree(s);
402
Damien Miller6f83b8e2000-05-02 09:23:45 +1000403 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000404 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000405 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000406 buffer_free(&c->input);
407 buffer_free(&c->output);
408 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000409 if (c->remote_name) {
410 xfree(c->remote_name);
411 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100412 }
Damien Millera1c1b6c2009-01-28 16:29:49 +1100413 if (c->path) {
414 xfree(c->path);
415 c->path = NULL;
416 }
Damien Millerb84886b2008-05-19 15:05:07 +1000417 while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
418 if (cc->abandon_cb != NULL)
419 cc->abandon_cb(c, cc->ctx);
420 TAILQ_REMOVE(&c->status_confirms, cc, entry);
421 bzero(cc, sizeof(*cc));
422 xfree(cc);
423 }
Darren Tucker84c56f52008-06-13 04:55:46 +1000424 if (c->filter_cleanup != NULL && c->filter_ctx != NULL)
425 c->filter_cleanup(c->self, c->filter_ctx);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000426 channels[c->self] = NULL;
427 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000428}
429
Ben Lindstrome9c99912001-06-09 00:41:05 +0000430void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000431channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000432{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000433 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000434
Ben Lindstrom601e4362001-06-21 03:19:23 +0000435 for (i = 0; i < channels_alloc; i++)
436 if (channels[i] != NULL)
437 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000438}
439
440/*
441 * Closes the sockets/fds of all channels. This is used to close extra file
442 * descriptors after a fork.
443 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000444void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000445channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000446{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000447 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000448
449 for (i = 0; i < channels_alloc; i++)
450 if (channels[i] != NULL)
451 channel_close_fds(channels[i]);
452}
453
454/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000455 * Stop listening to channels.
456 */
Ben Lindstrom809744e2001-07-04 05:26:06 +0000457void
458channel_stop_listening(void)
459{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000460 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000461 Channel *c;
462
463 for (i = 0; i < channels_alloc; i++) {
464 c = channels[i];
465 if (c != NULL) {
466 switch (c->type) {
467 case SSH_CHANNEL_AUTH_SOCKET:
468 case SSH_CHANNEL_PORT_LISTENER:
469 case SSH_CHANNEL_RPORT_LISTENER:
470 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000471 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000472 channel_free(c);
473 break;
474 }
475 }
476 }
477}
478
479/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000480 * Returns true if no channel has too much buffered data, and false if one or
481 * more channel is overfull.
482 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000483int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000484channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000485{
486 u_int i;
487 Channel *c;
488
489 for (i = 0; i < channels_alloc; i++) {
490 c = channels[i];
491 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000492#if 0
493 if (!compat20 &&
494 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100495 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000496 c->self, buffer_len(&c->input));
497 return 0;
498 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000499#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000500 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000501 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000502 c->self, buffer_len(&c->output),
503 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000504 return 0;
505 }
506 }
507 }
508 return 1;
509}
510
511/* Returns true if any channel is still open. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000512int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000513channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000514{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000515 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000516 Channel *c;
517
518 for (i = 0; i < channels_alloc; i++) {
519 c = channels[i];
520 if (c == NULL)
521 continue;
522 switch (c->type) {
523 case SSH_CHANNEL_X11_LISTENER:
524 case SSH_CHANNEL_PORT_LISTENER:
525 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100526 case SSH_CHANNEL_MUX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000527 case SSH_CHANNEL_CLOSED:
528 case SSH_CHANNEL_AUTH_SOCKET:
529 case SSH_CHANNEL_DYNAMIC:
530 case SSH_CHANNEL_CONNECTING:
531 case SSH_CHANNEL_ZOMBIE:
532 continue;
533 case SSH_CHANNEL_LARVAL:
534 if (!compat20)
535 fatal("cannot happen: SSH_CHANNEL_LARVAL");
536 continue;
537 case SSH_CHANNEL_OPENING:
538 case SSH_CHANNEL_OPEN:
539 case SSH_CHANNEL_X11_OPEN:
Damien Millere1537f92010-01-26 13:26:22 +1100540 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000541 return 1;
542 case SSH_CHANNEL_INPUT_DRAINING:
543 case SSH_CHANNEL_OUTPUT_DRAINING:
544 if (!compat13)
545 fatal("cannot happen: OUT_DRAIN");
546 return 1;
547 default:
548 fatal("channel_still_open: bad channel type %d", c->type);
549 /* NOTREACHED */
550 }
551 }
552 return 0;
553}
554
555/* Returns the id of an open channel suitable for keepaliving */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000556int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000557channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000558{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000559 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000560 Channel *c;
561
562 for (i = 0; i < channels_alloc; i++) {
563 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000564 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000565 continue;
566 switch (c->type) {
567 case SSH_CHANNEL_CLOSED:
568 case SSH_CHANNEL_DYNAMIC:
569 case SSH_CHANNEL_X11_LISTENER:
570 case SSH_CHANNEL_PORT_LISTENER:
571 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100572 case SSH_CHANNEL_MUX_LISTENER:
573 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000574 case SSH_CHANNEL_OPENING:
575 case SSH_CHANNEL_CONNECTING:
576 case SSH_CHANNEL_ZOMBIE:
577 continue;
578 case SSH_CHANNEL_LARVAL:
579 case SSH_CHANNEL_AUTH_SOCKET:
580 case SSH_CHANNEL_OPEN:
581 case SSH_CHANNEL_X11_OPEN:
582 return i;
583 case SSH_CHANNEL_INPUT_DRAINING:
584 case SSH_CHANNEL_OUTPUT_DRAINING:
585 if (!compat13)
586 fatal("cannot happen: OUT_DRAIN");
587 return i;
588 default:
589 fatal("channel_find_open: bad channel type %d", c->type);
590 /* NOTREACHED */
591 }
592 }
593 return -1;
594}
595
596
597/*
598 * Returns a message describing the currently open forwarded connections,
599 * suitable for sending to the client. The message contains crlf pairs for
600 * newlines.
601 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000602char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000603channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000604{
605 Buffer buffer;
606 Channel *c;
607 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000608 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000609
610 buffer_init(&buffer);
611 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
612 buffer_append(&buffer, buf, strlen(buf));
613 for (i = 0; i < channels_alloc; i++) {
614 c = channels[i];
615 if (c == NULL)
616 continue;
617 switch (c->type) {
618 case SSH_CHANNEL_X11_LISTENER:
619 case SSH_CHANNEL_PORT_LISTENER:
620 case SSH_CHANNEL_RPORT_LISTENER:
621 case SSH_CHANNEL_CLOSED:
622 case SSH_CHANNEL_AUTH_SOCKET:
623 case SSH_CHANNEL_ZOMBIE:
Damien Millere1537f92010-01-26 13:26:22 +1100624 case SSH_CHANNEL_MUX_CLIENT:
625 case SSH_CHANNEL_MUX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000626 continue;
627 case SSH_CHANNEL_LARVAL:
628 case SSH_CHANNEL_OPENING:
629 case SSH_CHANNEL_CONNECTING:
630 case SSH_CHANNEL_DYNAMIC:
631 case SSH_CHANNEL_OPEN:
632 case SSH_CHANNEL_X11_OPEN:
633 case SSH_CHANNEL_INPUT_DRAINING:
634 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000635 snprintf(buf, sizeof buf,
Damien Millere1537f92010-01-26 13:26:22 +1100636 " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d cc %d)\r\n",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000637 c->self, c->remote_name,
638 c->type, c->remote_id,
639 c->istate, buffer_len(&c->input),
640 c->ostate, buffer_len(&c->output),
Damien Millere1537f92010-01-26 13:26:22 +1100641 c->rfd, c->wfd, c->ctl_chan);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000642 buffer_append(&buffer, buf, strlen(buf));
643 continue;
644 default:
645 fatal("channel_open_message: bad channel type %d", c->type);
646 /* NOTREACHED */
647 }
648 }
649 buffer_append(&buffer, "\0", 1);
650 cp = xstrdup(buffer_ptr(&buffer));
651 buffer_free(&buffer);
652 return cp;
653}
654
655void
656channel_send_open(int id)
657{
658 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000659
Ben Lindstrome9c99912001-06-09 00:41:05 +0000660 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000661 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000662 return;
663 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000664 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000665 packet_start(SSH2_MSG_CHANNEL_OPEN);
666 packet_put_cstring(c->ctype);
667 packet_put_int(c->self);
668 packet_put_int(c->local_window);
669 packet_put_int(c->local_maxpacket);
670 packet_send();
671}
672
673void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000674channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000675{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000676 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000677
Ben Lindstrome9c99912001-06-09 00:41:05 +0000678 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000679 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000680 return;
681 }
Damien Miller0e220db2004-06-15 10:34:08 +1000682 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000683 packet_start(SSH2_MSG_CHANNEL_REQUEST);
684 packet_put_int(c->remote_id);
685 packet_put_cstring(service);
686 packet_put_char(wantconfirm);
687}
Damien Miller4f7becb2006-03-26 14:10:14 +1100688
Ben Lindstrome9c99912001-06-09 00:41:05 +0000689void
Damien Millerb84886b2008-05-19 15:05:07 +1000690channel_register_status_confirm(int id, channel_confirm_cb *cb,
691 channel_confirm_abandon_cb *abandon_cb, void *ctx)
692{
693 struct channel_confirm *cc;
694 Channel *c;
695
696 if ((c = channel_lookup(id)) == NULL)
697 fatal("channel_register_expect: %d: bad id", id);
698
699 cc = xmalloc(sizeof(*cc));
700 cc->cb = cb;
701 cc->abandon_cb = abandon_cb;
702 cc->ctx = ctx;
703 TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry);
704}
705
706void
Damien Millerd530f5f2010-05-21 14:57:10 +1000707channel_register_open_confirm(int id, channel_open_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000708{
709 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000710
Ben Lindstrome9c99912001-06-09 00:41:05 +0000711 if (c == NULL) {
Damien Millera0094332008-11-03 19:26:35 +1100712 logit("channel_register_open_confirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000713 return;
714 }
Damien Millerb84886b2008-05-19 15:05:07 +1000715 c->open_confirm = fn;
716 c->open_confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000717}
Damien Miller4f7becb2006-03-26 14:10:14 +1100718
Ben Lindstrome9c99912001-06-09 00:41:05 +0000719void
Damien Miller39eda6e2005-11-05 14:52:50 +1100720channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000721{
Damien Millerd47c62a2005-12-13 19:33:57 +1100722 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000723
Ben Lindstrome9c99912001-06-09 00:41:05 +0000724 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000725 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000726 return;
727 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000728 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100729 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000730}
Damien Miller4f7becb2006-03-26 14:10:14 +1100731
Ben Lindstrome9c99912001-06-09 00:41:05 +0000732void
733channel_cancel_cleanup(int id)
734{
Damien Millerd47c62a2005-12-13 19:33:57 +1100735 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000736
Ben Lindstrome9c99912001-06-09 00:41:05 +0000737 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000738 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000739 return;
740 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000741 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100742 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000743}
Damien Miller4f7becb2006-03-26 14:10:14 +1100744
Ben Lindstrome9c99912001-06-09 00:41:05 +0000745void
Damien Miller077b2382005-12-31 16:22:32 +1100746channel_register_filter(int id, channel_infilter_fn *ifn,
Darren Tucker84c56f52008-06-13 04:55:46 +1000747 channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000748{
749 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000750
Ben Lindstrome9c99912001-06-09 00:41:05 +0000751 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000752 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000753 return;
754 }
Damien Miller077b2382005-12-31 16:22:32 +1100755 c->input_filter = ifn;
756 c->output_filter = ofn;
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000757 c->filter_ctx = ctx;
Darren Tucker84c56f52008-06-13 04:55:46 +1000758 c->filter_cleanup = cfn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000759}
760
761void
762channel_set_fds(int id, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000763 int extusage, int nonblock, int is_tty, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000764{
765 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000766
Ben Lindstrome9c99912001-06-09 00:41:05 +0000767 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
768 fatal("channel_activate for non-larval channel %d.", id);
Darren Tuckered3cdc02008-06-16 23:29:18 +1000769 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000770 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100771 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000772 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
773 packet_put_int(c->remote_id);
774 packet_put_int(c->local_window);
775 packet_send();
776}
777
Damien Miller5428f641999-11-25 11:54:57 +1100778/*
Damien Millerb38eff82000-04-01 11:09:21 +1000779 * 'channel_pre*' are called just before select() to add any bits relevant to
780 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100781 */
Damien Millerb38eff82000-04-01 11:09:21 +1000782/*
783 * 'channel_post*': perform any appropriate operations for channels which
784 * have events pending.
785 */
Damien Millerd62f2ca2006-03-26 13:57:41 +1100786typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000787chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
788chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
789
Damien Miller8473dd82006-07-24 14:08:32 +1000790/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000791static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100792channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000793{
794 FD_SET(c->sock, readset);
795}
796
Damien Miller8473dd82006-07-24 14:08:32 +1000797/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000798static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100799channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000800{
801 debug3("channel %d: waiting for connection", c->self);
802 FD_SET(c->sock, writeset);
803}
804
Ben Lindstrombba81212001-06-25 05:01:22 +0000805static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100806channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000807{
808 if (buffer_len(&c->input) < packet_get_maxsize())
809 FD_SET(c->sock, readset);
810 if (buffer_len(&c->output) > 0)
811 FD_SET(c->sock, writeset);
812}
813
Ben Lindstrombba81212001-06-25 05:01:22 +0000814static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100815channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000816{
Damien Millerde6987c2002-01-22 23:20:40 +1100817 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000818
Damien Miller33b13562000-04-04 14:38:59 +1000819 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100820 limit > 0 &&
Damien Miller499a0d52006-04-23 12:06:03 +1000821 buffer_len(&c->input) < limit &&
822 buffer_check_alloc(&c->input, CHAN_RBUF))
Damien Miller33b13562000-04-04 14:38:59 +1000823 FD_SET(c->rfd, readset);
824 if (c->ostate == CHAN_OUTPUT_OPEN ||
825 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
826 if (buffer_len(&c->output) > 0) {
827 FD_SET(c->wfd, writeset);
828 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000829 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000830 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
831 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000832 else
833 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000834 }
835 }
836 /** XXX check close conditions, too */
Damien Millerd654dd22008-05-19 16:05:41 +1000837 if (compat20 && c->efd != -1 &&
838 !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) {
Damien Miller33b13562000-04-04 14:38:59 +1000839 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
840 buffer_len(&c->extended) > 0)
841 FD_SET(c->efd, writeset);
Ben Lindstromcf159442002-03-26 03:26:24 +0000842 else if (!(c->flags & CHAN_EOF_SENT) &&
843 c->extended_usage == CHAN_EXTENDED_READ &&
Damien Miller33b13562000-04-04 14:38:59 +1000844 buffer_len(&c->extended) < c->remote_window)
845 FD_SET(c->efd, readset);
846 }
Damien Miller0e220db2004-06-15 10:34:08 +1000847 /* XXX: What about efd? races? */
Damien Miller33b13562000-04-04 14:38:59 +1000848}
849
Damien Miller8473dd82006-07-24 14:08:32 +1000850/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000851static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100852channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000853{
854 if (buffer_len(&c->input) == 0) {
855 packet_start(SSH_MSG_CHANNEL_CLOSE);
856 packet_put_int(c->remote_id);
857 packet_send();
858 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000859 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000860 }
861}
862
Damien Miller8473dd82006-07-24 14:08:32 +1000863/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000864static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100865channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000866{
867 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000868 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000869 else
Damien Millerb38eff82000-04-01 11:09:21 +1000870 FD_SET(c->sock, writeset);
871}
872
873/*
874 * This is a special state for X11 authentication spoofing. An opened X11
875 * connection (when authentication spoofing is being done) remains in this
876 * state until the first packet has been completely read. The authentication
877 * data in that packet is then substituted by the real data if it matches the
878 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000879 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000880 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000881 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000882static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000883x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000884{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000885 u_char *ucp;
886 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000887
888 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000889 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000890 return 0;
891
892 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100893 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000894 if (ucp[0] == 0x42) { /* Byte order MSB first. */
895 proto_len = 256 * ucp[6] + ucp[7];
896 data_len = 256 * ucp[8] + ucp[9];
897 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
898 proto_len = ucp[6] + 256 * ucp[7];
899 data_len = ucp[8] + 256 * ucp[9];
900 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000901 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100902 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000903 return -1;
904 }
905
906 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000907 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000908 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
909 return 0;
910
911 /* Check if authentication protocol matches. */
912 if (proto_len != strlen(x11_saved_proto) ||
913 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000914 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000915 return -1;
916 }
917 /* Check if authentication data matches our fake data. */
918 if (data_len != x11_fake_data_len ||
919 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
920 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000921 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000922 return -1;
923 }
924 /* Check fake data length */
925 if (x11_fake_data_len != x11_saved_data_len) {
926 error("X11 fake_data_len %d != saved_data_len %d",
927 x11_fake_data_len, x11_saved_data_len);
928 return -1;
929 }
930 /*
931 * Received authentication protocol and data match
932 * our fake data. Substitute the fake data with real
933 * data.
934 */
935 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
936 x11_saved_data, x11_saved_data_len);
937 return 1;
938}
939
Ben Lindstrombba81212001-06-25 05:01:22 +0000940static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100941channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000942{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000943 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000944
Damien Millerb38eff82000-04-01 11:09:21 +1000945 if (ret == 1) {
946 /* Start normal processing for the channel. */
947 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000948 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000949 } else if (ret == -1) {
950 /*
951 * We have received an X11 connection that has bad
952 * authentication information.
953 */
Damien Miller996acd22003-04-09 20:59:48 +1000954 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000955 buffer_clear(&c->input);
956 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000957 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000958 c->sock = -1;
959 c->type = SSH_CHANNEL_CLOSED;
960 packet_start(SSH_MSG_CHANNEL_CLOSE);
961 packet_put_int(c->remote_id);
962 packet_send();
963 }
964}
965
Ben Lindstrombba81212001-06-25 05:01:22 +0000966static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100967channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000968{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000969 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000970
971 /* c->force_drain = 1; */
972
Damien Millerb38eff82000-04-01 11:09:21 +1000973 if (ret == 1) {
974 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100975 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000976 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000977 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000978 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100979 chan_read_failed(c);
980 buffer_clear(&c->input);
981 chan_ibuf_empty(c);
982 buffer_clear(&c->output);
983 /* for proto v1, the peer will send an IEOF */
984 if (compat20)
985 chan_write_failed(c);
986 else
987 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000988 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000989 }
990}
991
Damien Millere1537f92010-01-26 13:26:22 +1100992static void
993channel_pre_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
994{
Damien Millerd530f5f2010-05-21 14:57:10 +1000995 if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause &&
Damien Millere1537f92010-01-26 13:26:22 +1100996 buffer_check_alloc(&c->input, CHAN_RBUF))
997 FD_SET(c->rfd, readset);
998 if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
999 /* clear buffer immediately (discard any partial packet) */
1000 buffer_clear(&c->input);
1001 chan_ibuf_empty(c);
1002 /* Start output drain. XXX just kill chan? */
1003 chan_rcvd_oclose(c);
1004 }
1005 if (c->ostate == CHAN_OUTPUT_OPEN ||
1006 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1007 if (buffer_len(&c->output) > 0)
1008 FD_SET(c->wfd, writeset);
1009 else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN)
1010 chan_obuf_empty(c);
1011 }
1012}
1013
Ben Lindstromb3921512001-04-11 15:57:50 +00001014/* try to decode a socks4 header */
Damien Miller8473dd82006-07-24 14:08:32 +10001015/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001016static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001017channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001018{
Damien Millera10f5612002-09-12 09:49:15 +10001019 char *p, *host;
Damien Miller1781f532009-01-28 16:24:41 +11001020 u_int len, have, i, found, need;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001021 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001022 struct {
1023 u_int8_t version;
1024 u_int8_t command;
1025 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +00001026 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001027 } s4_req, s4_rsp;
1028
Ben Lindstromb3921512001-04-11 15:57:50 +00001029 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001030
1031 have = buffer_len(&c->input);
1032 len = sizeof(s4_req);
1033 if (have < len)
1034 return 0;
1035 p = buffer_ptr(&c->input);
Damien Miller1781f532009-01-28 16:24:41 +11001036
1037 need = 1;
1038 /* SOCKS4A uses an invalid IP address 0.0.0.x */
1039 if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) {
1040 debug2("channel %d: socks4a request", c->self);
1041 /* ... and needs an extra string (the hostname) */
1042 need = 2;
1043 }
1044 /* Check for terminating NUL on the string(s) */
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001045 for (found = 0, i = len; i < have; i++) {
1046 if (p[i] == '\0') {
Damien Miller1781f532009-01-28 16:24:41 +11001047 found++;
1048 if (found == need)
1049 break;
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001050 }
1051 if (i > 1024) {
1052 /* the peer is probably sending garbage */
1053 debug("channel %d: decode socks4: too long",
1054 c->self);
1055 return -1;
1056 }
1057 }
Damien Miller1781f532009-01-28 16:24:41 +11001058 if (found < need)
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001059 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001060 buffer_get(&c->input, (char *)&s4_req.version, 1);
1061 buffer_get(&c->input, (char *)&s4_req.command, 1);
1062 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +00001063 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001064 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001065 p = buffer_ptr(&c->input);
1066 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001067 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Damien Miller1781f532009-01-28 16:24:41 +11001068 len++; /* trailing '\0' */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001069 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +00001070 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001071 c->self, len, have);
1072 strlcpy(username, p, sizeof(username));
1073 buffer_consume(&c->input, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001074
Damien Millera1c1b6c2009-01-28 16:29:49 +11001075 if (c->path != NULL) {
1076 xfree(c->path);
1077 c->path = NULL;
1078 }
Damien Miller1781f532009-01-28 16:24:41 +11001079 if (need == 1) { /* SOCKS4: one string */
1080 host = inet_ntoa(s4_req.dest_addr);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001081 c->path = xstrdup(host);
Damien Miller1781f532009-01-28 16:24:41 +11001082 } else { /* SOCKS4A: two strings */
1083 have = buffer_len(&c->input);
1084 p = buffer_ptr(&c->input);
1085 len = strlen(p);
1086 debug2("channel %d: decode socks4a: host %s/%d",
1087 c->self, p, len);
1088 len++; /* trailing '\0' */
1089 if (len > have)
1090 fatal("channel %d: decode socks4a: len %d > have %d",
1091 c->self, len, have);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001092 if (len > NI_MAXHOST) {
Damien Miller1781f532009-01-28 16:24:41 +11001093 error("channel %d: hostname \"%.100s\" too long",
1094 c->self, p);
1095 return -1;
1096 }
Damien Millera1c1b6c2009-01-28 16:29:49 +11001097 c->path = xstrdup(p);
Damien Miller1781f532009-01-28 16:24:41 +11001098 buffer_consume(&c->input, len);
1099 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001100 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001101
Damien Millerfbdeece2003-09-02 22:52:31 +10001102 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Damien Miller1781f532009-01-28 16:24:41 +11001103 c->self, c->path, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001104
Ben Lindstromb3921512001-04-11 15:57:50 +00001105 if (s4_req.command != 1) {
Damien Miller1781f532009-01-28 16:24:41 +11001106 debug("channel %d: cannot handle: %s cn %d",
1107 c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command);
Ben Lindstromb3921512001-04-11 15:57:50 +00001108 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001109 }
Ben Lindstromb3921512001-04-11 15:57:50 +00001110 s4_rsp.version = 0; /* vn: 0 for reply */
1111 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001112 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +00001113 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Damien Millera0fdce92006-03-26 14:28:50 +11001114 buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +00001115 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001116}
1117
Darren Tucker46471c92003-07-03 13:55:19 +10001118/* try to decode a socks5 header */
1119#define SSH_SOCKS5_AUTHDONE 0x1000
1120#define SSH_SOCKS5_NOAUTH 0x00
1121#define SSH_SOCKS5_IPV4 0x01
1122#define SSH_SOCKS5_DOMAIN 0x03
1123#define SSH_SOCKS5_IPV6 0x04
1124#define SSH_SOCKS5_CONNECT 0x01
1125#define SSH_SOCKS5_SUCCESS 0x00
1126
Damien Miller8473dd82006-07-24 14:08:32 +10001127/* ARGSUSED */
Darren Tucker46471c92003-07-03 13:55:19 +10001128static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001129channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
Darren Tucker46471c92003-07-03 13:55:19 +10001130{
1131 struct {
1132 u_int8_t version;
1133 u_int8_t command;
1134 u_int8_t reserved;
1135 u_int8_t atyp;
1136 } s5_req, s5_rsp;
1137 u_int16_t dest_port;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001138 u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN];
Damien Miller0f077072006-07-10 22:21:02 +10001139 u_int have, need, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001140
1141 debug2("channel %d: decode socks5", c->self);
1142 p = buffer_ptr(&c->input);
1143 if (p[0] != 0x05)
1144 return -1;
1145 have = buffer_len(&c->input);
1146 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1147 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001148 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001149 return 0;
1150 nmethods = p[1];
1151 if (have < nmethods + 2)
1152 return 0;
1153 /* look for method: "NO AUTHENTICATION REQUIRED" */
Damien Miller80163902007-01-05 16:30:16 +11001154 for (found = 0, i = 2; i < nmethods + 2; i++) {
Damien Miller4dec5d72006-08-05 11:38:40 +10001155 if (p[i] == SSH_SOCKS5_NOAUTH) {
Darren Tucker46471c92003-07-03 13:55:19 +10001156 found = 1;
1157 break;
1158 }
1159 }
1160 if (!found) {
1161 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1162 c->self);
1163 return -1;
1164 }
1165 buffer_consume(&c->input, nmethods + 2);
1166 buffer_put_char(&c->output, 0x05); /* version */
1167 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1168 FD_SET(c->sock, writeset);
1169 c->flags |= SSH_SOCKS5_AUTHDONE;
1170 debug2("channel %d: socks5 auth done", c->self);
1171 return 0; /* need more */
1172 }
1173 debug2("channel %d: socks5 post auth", c->self);
1174 if (have < sizeof(s5_req)+1)
1175 return 0; /* need more */
Damien Millere3b21a52006-03-26 14:29:06 +11001176 memcpy(&s5_req, p, sizeof(s5_req));
Darren Tucker46471c92003-07-03 13:55:19 +10001177 if (s5_req.version != 0x05 ||
1178 s5_req.command != SSH_SOCKS5_CONNECT ||
1179 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001180 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001181 return -1;
1182 }
Darren Tucker47eede72005-03-14 23:08:12 +11001183 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001184 case SSH_SOCKS5_IPV4:
1185 addrlen = 4;
1186 af = AF_INET;
1187 break;
1188 case SSH_SOCKS5_DOMAIN:
1189 addrlen = p[sizeof(s5_req)];
1190 af = -1;
1191 break;
1192 case SSH_SOCKS5_IPV6:
1193 addrlen = 16;
1194 af = AF_INET6;
1195 break;
1196 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001197 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001198 return -1;
1199 }
Damien Miller0f077072006-07-10 22:21:02 +10001200 need = sizeof(s5_req) + addrlen + 2;
1201 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1202 need++;
1203 if (have < need)
Darren Tucker46471c92003-07-03 13:55:19 +10001204 return 0;
1205 buffer_consume(&c->input, sizeof(s5_req));
1206 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1207 buffer_consume(&c->input, 1); /* host string length */
1208 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1209 buffer_get(&c->input, (char *)&dest_port, 2);
1210 dest_addr[addrlen] = '\0';
Damien Millera1c1b6c2009-01-28 16:29:49 +11001211 if (c->path != NULL) {
1212 xfree(c->path);
1213 c->path = NULL;
1214 }
1215 if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
Damien Miller9576ac42009-01-28 16:30:33 +11001216 if (addrlen >= NI_MAXHOST) {
Damien Millera1c1b6c2009-01-28 16:29:49 +11001217 error("channel %d: dynamic request: socks5 hostname "
1218 "\"%.100s\" too long", c->self, dest_addr);
1219 return -1;
1220 }
1221 c->path = xstrdup(dest_addr);
1222 } else {
1223 if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL)
1224 return -1;
1225 c->path = xstrdup(ntop);
1226 }
Darren Tucker46471c92003-07-03 13:55:19 +10001227 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001228
Damien Millerfbdeece2003-09-02 22:52:31 +10001229 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001230 c->self, c->path, c->host_port, s5_req.command);
1231
1232 s5_rsp.version = 0x05;
1233 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1234 s5_rsp.reserved = 0; /* ignored */
1235 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1236 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1237 dest_port = 0; /* ignored */
1238
Damien Millera0fdce92006-03-26 14:28:50 +11001239 buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp));
1240 buffer_append(&c->output, &dest_addr, sizeof(struct in_addr));
1241 buffer_append(&c->output, &dest_port, sizeof(dest_port));
Darren Tucker46471c92003-07-03 13:55:19 +10001242 return 1;
1243}
1244
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001245Channel *
Damien Millere1537f92010-01-26 13:26:22 +11001246channel_connect_stdio_fwd(const char *host_to_connect, u_short port_to_connect,
1247 int in, int out)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001248{
1249 Channel *c;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001250
1251 debug("channel_connect_stdio_fwd %s:%d", host_to_connect,
1252 port_to_connect);
1253
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001254 c = channel_new("stdio-forward", SSH_CHANNEL_OPENING, in, out,
1255 -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1256 0, "stdio-forward", /*nonblock*/0);
1257
1258 c->path = xstrdup(host_to_connect);
1259 c->host_port = port_to_connect;
1260 c->listening_port = 0;
1261 c->force_drain = 1;
1262
1263 channel_register_fds(c, in, out, -1, 0, 1, 0);
1264 port_open_helper(c, "direct-tcpip");
1265
1266 return c;
1267}
1268
Ben Lindstromb3921512001-04-11 15:57:50 +00001269/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001270static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001271channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstromb3921512001-04-11 15:57:50 +00001272{
1273 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001274 u_int have;
1275 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001276
1277 have = buffer_len(&c->input);
Ben Lindstromb3921512001-04-11 15:57:50 +00001278 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001279 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001280 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001281 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001282 /* need more */
1283 FD_SET(c->sock, readset);
1284 return;
1285 }
1286 /* try to guess the protocol */
1287 p = buffer_ptr(&c->input);
1288 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001289 case 0x04:
1290 ret = channel_decode_socks4(c, readset, writeset);
1291 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001292 case 0x05:
1293 ret = channel_decode_socks5(c, readset, writeset);
1294 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001295 default:
1296 ret = -1;
1297 break;
1298 }
1299 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001300 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001301 } else if (ret == 0) {
1302 debug2("channel %d: pre_dynamic: need more", c->self);
1303 /* need more */
1304 FD_SET(c->sock, readset);
1305 } else {
1306 /* switch to the next state */
1307 c->type = SSH_CHANNEL_OPENING;
1308 port_open_helper(c, "direct-tcpip");
1309 }
1310}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001311
Damien Millerb38eff82000-04-01 11:09:21 +10001312/* This is our fake X11 server socket. */
Damien Miller8473dd82006-07-24 14:08:32 +10001313/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001314static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001315channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001316{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001317 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001318 struct sockaddr_storage addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001319 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001320 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001321 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001322 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001323
1324 if (FD_ISSET(c->sock, readset)) {
1325 debug("X11 connection requested.");
1326 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001327 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001328 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001329 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001330 channel_close_fd(&c->sock);
1331 chan_mark_dead(c);
1332 }
Damien Millerb38eff82000-04-01 11:09:21 +10001333 if (newsock < 0) {
1334 error("accept: %.100s", strerror(errno));
1335 return;
1336 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001337 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001338 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001339 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001340 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001341 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001342
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001343 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001344 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001345 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001346 if (compat20) {
1347 packet_start(SSH2_MSG_CHANNEL_OPEN);
1348 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001349 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001350 packet_put_int(nc->local_window_max);
1351 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001352 /* originator ipaddr and port */
1353 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001354 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001355 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001356 } else {
1357 packet_put_int(remote_port);
1358 }
Damien Millerbd483e72000-04-30 10:00:53 +10001359 packet_send();
1360 } else {
1361 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001362 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001363 if (packet_get_protocol_flags() &
1364 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001365 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001366 packet_send();
1367 }
Damien Millerd83ff352001-01-30 09:19:34 +11001368 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001369 }
1370}
1371
Ben Lindstrombba81212001-06-25 05:01:22 +00001372static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001373port_open_helper(Channel *c, char *rtype)
1374{
1375 int direct;
1376 char buf[1024];
1377 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001378 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001379
Damien Millerd6369432010-02-02 17:02:07 +11001380 if (remote_port == -1) {
1381 /* Fake addr/port to appease peers that validate it (Tectia) */
1382 xfree(remote_ipaddr);
1383 remote_ipaddr = xstrdup("127.0.0.1");
1384 remote_port = 65535;
1385 }
1386
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001387 direct = (strcmp(rtype, "direct-tcpip") == 0);
1388
1389 snprintf(buf, sizeof buf,
1390 "%s: listening port %d for %.100s port %d, "
1391 "connect from %.200s port %d",
1392 rtype, c->listening_port, c->path, c->host_port,
1393 remote_ipaddr, remote_port);
1394
1395 xfree(c->remote_name);
1396 c->remote_name = xstrdup(buf);
1397
1398 if (compat20) {
1399 packet_start(SSH2_MSG_CHANNEL_OPEN);
1400 packet_put_cstring(rtype);
1401 packet_put_int(c->self);
1402 packet_put_int(c->local_window_max);
1403 packet_put_int(c->local_maxpacket);
1404 if (direct) {
1405 /* target host, port */
1406 packet_put_cstring(c->path);
1407 packet_put_int(c->host_port);
1408 } else {
1409 /* listen address, port */
1410 packet_put_cstring(c->path);
1411 packet_put_int(c->listening_port);
1412 }
1413 /* originator host and port */
1414 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001415 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001416 packet_send();
1417 } else {
1418 packet_start(SSH_MSG_PORT_OPEN);
1419 packet_put_int(c->self);
1420 packet_put_cstring(c->path);
1421 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001422 if (packet_get_protocol_flags() &
1423 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001424 packet_put_cstring(c->remote_name);
1425 packet_send();
1426 }
1427 xfree(remote_ipaddr);
1428}
1429
Damien Miller5e7fd072005-11-05 14:53:39 +11001430static void
1431channel_set_reuseaddr(int fd)
1432{
1433 int on = 1;
1434
1435 /*
1436 * Set socket options.
1437 * Allow local port reuse in TIME_WAIT.
1438 */
1439 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1440 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1441}
1442
Damien Millerb38eff82000-04-01 11:09:21 +10001443/*
1444 * This socket is listening for connections to a forwarded TCP/IP port.
1445 */
Damien Miller8473dd82006-07-24 14:08:32 +10001446/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001447static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001448channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001449{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001450 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001451 struct sockaddr_storage addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001452 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001453 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001454 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001455
Damien Millerb38eff82000-04-01 11:09:21 +10001456 if (FD_ISSET(c->sock, readset)) {
1457 debug("Connection to port %d forwarding "
1458 "to %.100s port %d requested.",
1459 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001460
Damien Miller4623a752001-10-10 15:03:58 +10001461 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1462 nextstate = SSH_CHANNEL_OPENING;
1463 rtype = "forwarded-tcpip";
1464 } else {
1465 if (c->host_port == 0) {
1466 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001467 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001468 } else {
1469 nextstate = SSH_CHANNEL_OPENING;
1470 rtype = "direct-tcpip";
1471 }
1472 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001473
Damien Millerb38eff82000-04-01 11:09:21 +10001474 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001475 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001476 if (newsock < 0) {
1477 error("accept: %.100s", strerror(errno));
1478 return;
1479 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001480 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001481 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1482 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001483 nc->listening_port = c->listening_port;
1484 nc->host_port = c->host_port;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001485 if (c->path != NULL)
1486 nc->path = xstrdup(c->path);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001487
Darren Tucker876045b2010-01-08 17:08:00 +11001488 if (nextstate != SSH_CHANNEL_DYNAMIC)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001489 port_open_helper(nc, rtype);
Damien Millerb38eff82000-04-01 11:09:21 +10001490 }
1491}
1492
1493/*
1494 * This is the authentication agent socket listening for connections from
1495 * clients.
1496 */
Damien Miller8473dd82006-07-24 14:08:32 +10001497/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001498static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001499channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001500{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001501 Channel *nc;
1502 int newsock;
Damien Miller163886f2008-07-14 11:28:58 +10001503 struct sockaddr_storage addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001504 socklen_t addrlen;
1505
1506 if (FD_ISSET(c->sock, readset)) {
1507 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001508 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001509 if (newsock < 0) {
1510 error("accept from auth socket: %.100s", strerror(errno));
1511 return;
1512 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001513 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001514 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1515 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001516 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001517 if (compat20) {
1518 packet_start(SSH2_MSG_CHANNEL_OPEN);
1519 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001520 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001521 packet_put_int(c->local_window_max);
1522 packet_put_int(c->local_maxpacket);
1523 } else {
1524 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001525 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001526 }
Damien Millerb38eff82000-04-01 11:09:21 +10001527 packet_send();
1528 }
1529}
1530
Damien Miller8473dd82006-07-24 14:08:32 +10001531/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001532static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001533channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001534{
Damien Millerbd740252008-05-19 15:37:09 +10001535 int err = 0, sock;
Ben Lindstrom11180952001-07-04 05:13:35 +00001536 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001537
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001538 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001539 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001540 err = errno;
1541 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001542 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001543 if (err == 0) {
Damien Millerbd740252008-05-19 15:37:09 +10001544 debug("channel %d: connected to %s port %d",
1545 c->self, c->connect_ctx.host, c->connect_ctx.port);
1546 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001547 c->type = SSH_CHANNEL_OPEN;
1548 if (compat20) {
1549 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1550 packet_put_int(c->remote_id);
1551 packet_put_int(c->self);
1552 packet_put_int(c->local_window);
1553 packet_put_int(c->local_maxpacket);
1554 } else {
1555 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1556 packet_put_int(c->remote_id);
1557 packet_put_int(c->self);
1558 }
1559 } else {
Damien Millerbd740252008-05-19 15:37:09 +10001560 debug("channel %d: connection failed: %s",
Ben Lindstrom69128662001-05-08 20:07:39 +00001561 c->self, strerror(err));
Damien Millerbd740252008-05-19 15:37:09 +10001562 /* Try next address, if any */
1563 if ((sock = connect_next(&c->connect_ctx)) > 0) {
1564 close(c->sock);
1565 c->sock = c->rfd = c->wfd = sock;
1566 channel_max_fd = channel_find_maxfd();
1567 return;
1568 }
1569 /* Exhausted all addresses */
1570 error("connect_to %.100s port %d: failed.",
1571 c->connect_ctx.host, c->connect_ctx.port);
1572 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001573 if (compat20) {
1574 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1575 packet_put_int(c->remote_id);
1576 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1577 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1578 packet_put_cstring(strerror(err));
1579 packet_put_cstring("");
1580 }
1581 } else {
1582 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1583 packet_put_int(c->remote_id);
1584 }
1585 chan_mark_dead(c);
1586 }
1587 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001588 }
1589}
1590
Damien Miller8473dd82006-07-24 14:08:32 +10001591/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001592static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001593channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001594{
Darren Tucker11327cc2005-03-14 23:22:25 +11001595 char buf[CHAN_RBUF];
Damien Miller835284b2007-06-11 13:03:16 +10001596 int len, force;
Damien Millerb38eff82000-04-01 11:09:21 +10001597
Damien Miller835284b2007-06-11 13:03:16 +10001598 force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED;
1599 if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001600 errno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001601 len = read(c->rfd, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +10001602 if (len < 0 && (errno == EINTR ||
1603 ((errno == EAGAIN || errno == EWOULDBLOCK) && !force)))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001604 return 1;
Darren Tucker9afe1152006-06-23 21:24:12 +10001605#ifndef PTY_ZEROREAD
Damien Millerb38eff82000-04-01 11:09:21 +10001606 if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001607#else
Darren Tucker144e8d62006-06-25 08:25:25 +10001608 if ((!c->isatty && len <= 0) ||
1609 (c->isatty && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001610#endif
Damien Millerfbdeece2003-09-02 22:52:31 +10001611 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001612 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001613 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001614 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001615 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001616 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001617 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001618 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001619 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001620 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001621 } else {
1622 chan_read_failed(c);
1623 }
1624 return -1;
1625 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001626 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001627 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001628 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001629 chan_read_failed(c);
1630 }
Damien Millerd27b9472005-12-13 19:29:02 +11001631 } else if (c->datagram) {
1632 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001633 } else {
1634 buffer_append(&c->input, buf, len);
1635 }
Damien Millerb38eff82000-04-01 11:09:21 +10001636 }
1637 return 1;
1638}
Damien Miller4f7becb2006-03-26 14:10:14 +11001639
Damien Miller8473dd82006-07-24 14:08:32 +10001640/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001641static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001642channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001643{
Ben Lindstrome229b252001-03-05 06:28:06 +00001644 struct termios tio;
Damien Miller077b2382005-12-31 16:22:32 +11001645 u_char *data = NULL, *buf;
Ben Lindstrom6d218f42001-09-18 05:53:12 +00001646 u_int dlen;
Damien Millerb38eff82000-04-01 11:09:21 +10001647 int len;
1648
1649 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001650 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001651 FD_ISSET(c->wfd, writeset) &&
1652 buffer_len(&c->output) > 0) {
Damien Miller077b2382005-12-31 16:22:32 +11001653 if (c->output_filter != NULL) {
1654 if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1655 debug2("channel %d: filter stops", c->self);
Damien Millere204f6a2006-01-31 21:47:15 +11001656 if (c->type != SSH_CHANNEL_OPEN)
1657 chan_mark_dead(c);
1658 else
1659 chan_write_failed(c);
1660 return -1;
Damien Miller077b2382005-12-31 16:22:32 +11001661 }
1662 } else if (c->datagram) {
1663 buf = data = buffer_get_string(&c->output, &dlen);
1664 } else {
1665 buf = data = buffer_ptr(&c->output);
1666 dlen = buffer_len(&c->output);
1667 }
1668
Damien Millerd27b9472005-12-13 19:29:02 +11001669 if (c->datagram) {
Damien Millerd27b9472005-12-13 19:29:02 +11001670 /* ignore truncated writes, datagrams might get lost */
1671 c->local_consumed += dlen + 4;
Damien Miller077b2382005-12-31 16:22:32 +11001672 len = write(c->wfd, buf, dlen);
Damien Millerd27b9472005-12-13 19:29:02 +11001673 xfree(data);
Damien Millerd8968ad2008-07-04 23:10:49 +10001674 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1675 errno == EWOULDBLOCK))
Damien Millerd27b9472005-12-13 19:29:02 +11001676 return 1;
1677 if (len <= 0) {
1678 if (c->type != SSH_CHANNEL_OPEN)
1679 chan_mark_dead(c);
1680 else
1681 chan_write_failed(c);
1682 return -1;
1683 }
1684 return 1;
1685 }
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001686#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001687 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001688 if (compat20 && c->wfd_isatty)
1689 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001690#endif
Damien Miller077b2382005-12-31 16:22:32 +11001691
1692 len = write(c->wfd, buf, dlen);
Damien Millerd8968ad2008-07-04 23:10:49 +10001693 if (len < 0 &&
1694 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001695 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001696 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001697 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001698 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001699 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001700 return -1;
1701 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001702 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001703 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001704 c->type = SSH_CHANNEL_INPUT_DRAINING;
1705 } else {
1706 chan_write_failed(c);
1707 }
1708 return -1;
1709 }
Darren Tucker3980b632009-08-28 11:02:37 +10001710#ifndef BROKEN_TCGETATTR_ICANON
Damien Miller077b2382005-12-31 16:22:32 +11001711 if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001712 if (tcgetattr(c->wfd, &tio) == 0 &&
1713 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1714 /*
1715 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001716 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001717 * size of a SSH2_MSG_CHANNEL_DATA message
Damien Miller077b2382005-12-31 16:22:32 +11001718 * (4 byte channel id + buf)
Damien Miller79438cc2001-02-16 12:34:57 +11001719 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001720 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001721 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001722 }
1723 }
Darren Tucker3980b632009-08-28 11:02:37 +10001724#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001725 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001726 if (compat20 && len > 0) {
1727 c->local_consumed += len;
1728 }
1729 }
1730 return 1;
1731}
Damien Miller4f7becb2006-03-26 14:10:14 +11001732
Ben Lindstrombba81212001-06-25 05:01:22 +00001733static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001734channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller33b13562000-04-04 14:38:59 +10001735{
Darren Tucker11327cc2005-03-14 23:22:25 +11001736 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001737 int len;
1738
Damien Miller1383bd82000-04-06 12:32:37 +10001739/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001740 if (c->efd != -1) {
1741 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1742 FD_ISSET(c->efd, writeset) &&
1743 buffer_len(&c->extended) > 0) {
1744 len = write(c->efd, buffer_ptr(&c->extended),
1745 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001746 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001747 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001748 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1749 errno == EWOULDBLOCK))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001750 return 1;
1751 if (len <= 0) {
1752 debug2("channel %d: closing write-efd %d",
1753 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001754 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001755 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001756 buffer_consume(&c->extended, len);
1757 c->local_consumed += len;
1758 }
1759 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
Damien Millere42bd242007-01-29 10:16:28 +11001760 (c->detach_close || FD_ISSET(c->efd, readset))) {
Damien Miller33b13562000-04-04 14:38:59 +10001761 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001762 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001763 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001764 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
1765 errno == EWOULDBLOCK) && !c->detach_close)))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001766 return 1;
1767 if (len <= 0) {
1768 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001769 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001770 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001771 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001772 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001773 }
Damien Miller33b13562000-04-04 14:38:59 +10001774 }
1775 }
1776 return 1;
1777}
Damien Miller4f7becb2006-03-26 14:10:14 +11001778
Damien Miller0e220db2004-06-15 10:34:08 +10001779static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001780channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001781{
Ben Lindstromb3921512001-04-11 15:57:50 +00001782 if (c->type == SSH_CHANNEL_OPEN &&
1783 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Darren Tuckerae09cb82007-06-25 19:04:46 +10001784 ((c->local_window_max - c->local_window >
Damien Miller3191a8e2007-06-11 18:33:15 +10001785 c->local_maxpacket*3) ||
1786 c->local_window < c->local_window_max/2) &&
Damien Miller33b13562000-04-04 14:38:59 +10001787 c->local_consumed > 0) {
1788 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1789 packet_put_int(c->remote_id);
1790 packet_put_int(c->local_consumed);
1791 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001792 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001793 c->self, c->local_window,
1794 c->local_consumed);
1795 c->local_window += c->local_consumed;
1796 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001797 }
1798 return 1;
1799}
1800
Ben Lindstrombba81212001-06-25 05:01:22 +00001801static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001802channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001803{
1804 channel_handle_rfd(c, readset, writeset);
1805 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001806 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001807 return;
Damien Miller33b13562000-04-04 14:38:59 +10001808 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001809 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001810}
1811
Damien Millere1537f92010-01-26 13:26:22 +11001812static u_int
1813read_mux(Channel *c, u_int need)
1814{
1815 char buf[CHAN_RBUF];
1816 int len;
1817 u_int rlen;
1818
1819 if (buffer_len(&c->input) < need) {
1820 rlen = need - buffer_len(&c->input);
1821 len = read(c->rfd, buf, MIN(rlen, CHAN_RBUF));
1822 if (len <= 0) {
1823 if (errno != EINTR && errno != EAGAIN) {
1824 debug2("channel %d: ctl read<=0 rfd %d len %d",
1825 c->self, c->rfd, len);
1826 chan_read_failed(c);
1827 return 0;
1828 }
1829 } else
1830 buffer_append(&c->input, buf, len);
1831 }
1832 return buffer_len(&c->input);
1833}
1834
1835static void
1836channel_post_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
1837{
1838 u_int need;
1839 ssize_t len;
1840
1841 if (!compat20)
1842 fatal("%s: entered with !compat20", __func__);
1843
Damien Millerd530f5f2010-05-21 14:57:10 +10001844 if (c->rfd != -1 && !c->mux_pause && FD_ISSET(c->rfd, readset) &&
Damien Millere1537f92010-01-26 13:26:22 +11001845 (c->istate == CHAN_INPUT_OPEN ||
1846 c->istate == CHAN_INPUT_WAIT_DRAIN)) {
1847 /*
1848 * Don't not read past the precise end of packets to
1849 * avoid disrupting fd passing.
1850 */
1851 if (read_mux(c, 4) < 4) /* read header */
1852 return;
1853 need = get_u32(buffer_ptr(&c->input));
1854#define CHANNEL_MUX_MAX_PACKET (256 * 1024)
1855 if (need > CHANNEL_MUX_MAX_PACKET) {
1856 debug2("channel %d: packet too big %u > %u",
1857 c->self, CHANNEL_MUX_MAX_PACKET, need);
1858 chan_rcvd_oclose(c);
1859 return;
1860 }
1861 if (read_mux(c, need + 4) < need + 4) /* read body */
1862 return;
1863 if (c->mux_rcb(c) != 0) {
1864 debug("channel %d: mux_rcb failed", c->self);
1865 chan_mark_dead(c);
1866 return;
1867 }
1868 }
1869
1870 if (c->wfd != -1 && FD_ISSET(c->wfd, writeset) &&
1871 buffer_len(&c->output) > 0) {
1872 len = write(c->wfd, buffer_ptr(&c->output),
1873 buffer_len(&c->output));
1874 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1875 return;
1876 if (len <= 0) {
1877 chan_mark_dead(c);
1878 return;
1879 }
1880 buffer_consume(&c->output, len);
1881 }
1882}
1883
1884static void
1885channel_post_mux_listener(Channel *c, fd_set *readset, fd_set *writeset)
1886{
1887 Channel *nc;
1888 struct sockaddr_storage addr;
1889 socklen_t addrlen;
1890 int newsock;
1891 uid_t euid;
1892 gid_t egid;
1893
1894 if (!FD_ISSET(c->sock, readset))
1895 return;
1896
1897 debug("multiplexing control connection");
1898
1899 /*
1900 * Accept connection on control socket
1901 */
1902 memset(&addr, 0, sizeof(addr));
1903 addrlen = sizeof(addr);
1904 if ((newsock = accept(c->sock, (struct sockaddr*)&addr,
1905 &addrlen)) == -1) {
1906 error("%s accept: %s", __func__, strerror(errno));
1907 return;
1908 }
1909
1910 if (getpeereid(newsock, &euid, &egid) < 0) {
1911 error("%s getpeereid failed: %s", __func__,
1912 strerror(errno));
1913 close(newsock);
1914 return;
1915 }
1916 if ((euid != 0) && (getuid() != euid)) {
1917 error("multiplex uid mismatch: peer euid %u != uid %u",
1918 (u_int)euid, (u_int)getuid());
1919 close(newsock);
1920 return;
1921 }
1922 nc = channel_new("multiplex client", SSH_CHANNEL_MUX_CLIENT,
1923 newsock, newsock, -1, c->local_window_max,
1924 c->local_maxpacket, 0, "mux-control", 1);
1925 nc->mux_rcb = c->mux_rcb;
1926 debug3("%s: new mux channel %d fd %d", __func__,
1927 nc->self, nc->sock);
1928 /* establish state */
1929 nc->mux_rcb(nc);
1930 /* mux state transitions must not elicit protocol messages */
1931 nc->flags |= CHAN_LOCAL;
1932}
1933
Damien Miller8473dd82006-07-24 14:08:32 +10001934/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001935static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001936channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001937{
1938 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001939
Damien Millerb38eff82000-04-01 11:09:21 +10001940 /* Send buffered output data to the socket. */
1941 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1942 len = write(c->sock, buffer_ptr(&c->output),
1943 buffer_len(&c->output));
1944 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001945 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001946 else
1947 buffer_consume(&c->output, len);
1948 }
1949}
1950
Ben Lindstrombba81212001-06-25 05:01:22 +00001951static void
Damien Miller33b13562000-04-04 14:38:59 +10001952channel_handler_init_20(void)
1953{
Damien Millerde6987c2002-01-22 23:20:40 +11001954 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001955 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001956 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001957 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001958 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001959 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001960 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001961 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millere1537f92010-01-26 13:26:22 +11001962 channel_pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener;
1963 channel_pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10001964
Damien Millerde6987c2002-01-22 23:20:40 +11001965 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001966 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001967 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001968 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001969 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001970 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001971 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millere1537f92010-01-26 13:26:22 +11001972 channel_post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener;
1973 channel_post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10001974}
1975
Ben Lindstrombba81212001-06-25 05:01:22 +00001976static void
Damien Millerb38eff82000-04-01 11:09:21 +10001977channel_handler_init_13(void)
1978{
1979 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1980 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1981 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1982 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1983 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1984 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1985 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001986 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001987 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001988
Damien Millerde6987c2002-01-22 23:20:40 +11001989 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001990 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1991 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1992 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1993 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001994 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001995 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001996}
1997
Ben Lindstrombba81212001-06-25 05:01:22 +00001998static void
Damien Millerb38eff82000-04-01 11:09:21 +10001999channel_handler_init_15(void)
2000{
Damien Millerde6987c2002-01-22 23:20:40 +11002001 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10002002 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002003 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2004 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2005 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002006 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002007 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10002008
2009 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2010 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2011 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11002012 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002013 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002014 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002015}
2016
Ben Lindstrombba81212001-06-25 05:01:22 +00002017static void
Damien Millerb38eff82000-04-01 11:09:21 +10002018channel_handler_init(void)
2019{
2020 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002021
Damien Miller9f0f5c62001-12-21 14:45:46 +11002022 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10002023 channel_pre[i] = NULL;
2024 channel_post[i] = NULL;
2025 }
Damien Miller33b13562000-04-04 14:38:59 +10002026 if (compat20)
2027 channel_handler_init_20();
2028 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002029 channel_handler_init_13();
2030 else
2031 channel_handler_init_15();
2032}
2033
Damien Miller3ec27592001-10-12 11:35:04 +10002034/* gc dead channels */
2035static void
2036channel_garbage_collect(Channel *c)
2037{
2038 if (c == NULL)
2039 return;
2040 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11002041 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10002042 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002043 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002044 c->detach_user(c->self, NULL);
2045 /* if we still have a callback */
2046 if (c->detach_user != NULL)
2047 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002048 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002049 }
2050 if (!chan_is_dead(c, 1))
2051 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002052 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002053 channel_free(c);
2054}
2055
Ben Lindstrombba81212001-06-25 05:01:22 +00002056static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11002057channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10002058{
2059 static int did_init = 0;
Darren Tucker876045b2010-01-08 17:08:00 +11002060 u_int i, oalloc;
Damien Millerb38eff82000-04-01 11:09:21 +10002061 Channel *c;
2062
2063 if (!did_init) {
2064 channel_handler_init();
2065 did_init = 1;
2066 }
Darren Tucker876045b2010-01-08 17:08:00 +11002067 for (i = 0, oalloc = channels_alloc; i < oalloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002068 c = channels[i];
2069 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10002070 continue;
Darren Tucker876045b2010-01-08 17:08:00 +11002071 if (c->delayed) {
2072 if (ftab == channel_pre)
2073 c->delayed = 0;
2074 else
2075 continue;
2076 }
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00002077 if (ftab[c->type] != NULL)
2078 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10002079 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002080 }
2081}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002082
Ben Lindstrome9c99912001-06-09 00:41:05 +00002083/*
2084 * Allocate/update select bitmasks and add any bits relevant to channels in
2085 * select bitmasks.
2086 */
Damien Miller4af51302000-04-16 11:18:38 +10002087void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002088channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002089 u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002090{
Damien Miller36812092006-03-26 14:22:47 +11002091 u_int n, sz, nfdset;
Damien Miller5e953212001-01-30 09:14:00 +11002092
2093 n = MAX(*maxfdp, channel_max_fd);
2094
Damien Miller36812092006-03-26 14:22:47 +11002095 nfdset = howmany(n+1, NFDBITS);
2096 /* Explicitly test here, because xrealloc isn't always called */
2097 if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask))
2098 fatal("channel_prepare_select: max_fd (%d) is too large", n);
2099 sz = nfdset * sizeof(fd_mask);
2100
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002101 /* perhaps check sz < nalloc/2 and shrink? */
2102 if (*readsetp == NULL || sz > *nallocp) {
Damien Miller36812092006-03-26 14:22:47 +11002103 *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask));
2104 *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask));
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002105 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11002106 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002107 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11002108 memset(*readsetp, 0, sz);
2109 memset(*writesetp, 0, sz);
2110
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002111 if (!rekeying)
2112 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002113}
2114
Ben Lindstrome9c99912001-06-09 00:41:05 +00002115/*
2116 * After select, perform any appropriate operations for channels which have
2117 * events pending.
2118 */
Damien Miller4af51302000-04-16 11:18:38 +10002119void
Damien Millerd62f2ca2006-03-26 13:57:41 +11002120channel_after_select(fd_set *readset, fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002121{
Damien Millerb38eff82000-04-01 11:09:21 +10002122 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002123}
2124
Ben Lindstrome9c99912001-06-09 00:41:05 +00002125
Damien Miller5e953212001-01-30 09:14:00 +11002126/* If there is data to send to the connection, enqueue some of it now. */
Damien Miller4af51302000-04-16 11:18:38 +10002127void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002128channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002129{
Damien Millerb38eff82000-04-01 11:09:21 +10002130 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002131 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002132
Damien Miller95def091999-11-25 00:26:21 +11002133 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002134 c = channels[i];
2135 if (c == NULL)
2136 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002137
Ben Lindstrome9c99912001-06-09 00:41:05 +00002138 /*
2139 * We are only interested in channels that can have buffered
2140 * incoming data.
2141 */
Damien Miller34132e52000-01-14 15:45:46 +11002142 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10002143 if (c->type != SSH_CHANNEL_OPEN &&
2144 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11002145 continue;
2146 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10002147 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002148 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002149 }
Damien Millerefb4afe2000-04-12 18:45:05 +10002150 if (compat20 &&
2151 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002152 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10002153 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002154 continue;
2155 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002156
Damien Miller95def091999-11-25 00:26:21 +11002157 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002158 if ((c->istate == CHAN_INPUT_OPEN ||
2159 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
2160 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11002161 if (c->datagram) {
2162 if (len > 0) {
2163 u_char *data;
2164 u_int dlen;
2165
2166 data = buffer_get_string(&c->input,
2167 &dlen);
2168 packet_start(SSH2_MSG_CHANNEL_DATA);
2169 packet_put_int(c->remote_id);
2170 packet_put_string(data, dlen);
2171 packet_send();
2172 c->remote_window -= dlen + 4;
2173 xfree(data);
2174 }
2175 continue;
2176 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002177 /*
2178 * Send some data for the other side over the secure
2179 * connection.
2180 */
Damien Miller33b13562000-04-04 14:38:59 +10002181 if (compat20) {
2182 if (len > c->remote_window)
2183 len = c->remote_window;
2184 if (len > c->remote_maxpacket)
2185 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11002186 } else {
Damien Miller33b13562000-04-04 14:38:59 +10002187 if (packet_is_interactive()) {
2188 if (len > 1024)
2189 len = 512;
2190 } else {
2191 /* Keep the packets at reasonable size. */
2192 if (len > packet_get_maxsize()/2)
2193 len = packet_get_maxsize()/2;
2194 }
Damien Miller95def091999-11-25 00:26:21 +11002195 }
Damien Millerb38eff82000-04-01 11:09:21 +10002196 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10002197 packet_start(compat20 ?
2198 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10002199 packet_put_int(c->remote_id);
2200 packet_put_string(buffer_ptr(&c->input), len);
2201 packet_send();
2202 buffer_consume(&c->input, len);
2203 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10002204 }
2205 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11002206 if (compat13)
2207 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11002208 /*
2209 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00002210 * tell peer, that we will not send more data: send IEOF.
2211 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11002212 */
Ben Lindstromcf159442002-03-26 03:26:24 +00002213 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10002214 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
2215 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00002216 else
2217 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11002218 }
Damien Miller33b13562000-04-04 14:38:59 +10002219 /* Send extended data, i.e. stderr */
2220 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00002221 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10002222 c->remote_window > 0 &&
2223 (len = buffer_len(&c->extended)) > 0 &&
2224 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002225 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002226 c->self, c->remote_window, buffer_len(&c->extended),
2227 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10002228 if (len > c->remote_window)
2229 len = c->remote_window;
2230 if (len > c->remote_maxpacket)
2231 len = c->remote_maxpacket;
2232 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
2233 packet_put_int(c->remote_id);
2234 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
2235 packet_put_string(buffer_ptr(&c->extended), len);
2236 packet_send();
2237 buffer_consume(&c->extended, len);
2238 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002239 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10002240 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002241 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002242}
2243
Ben Lindstrome9c99912001-06-09 00:41:05 +00002244
2245/* -- protocol input */
Damien Millerd79b4242006-03-31 23:11:44 +11002246
2247/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002248void
Damien Miller630d6f42002-01-22 23:17:30 +11002249channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002250{
Damien Miller34132e52000-01-14 15:45:46 +11002251 int id;
Damien Miller95def091999-11-25 00:26:21 +11002252 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00002253 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10002254 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002255
Damien Miller95def091999-11-25 00:26:21 +11002256 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11002257 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10002258 c = channel_lookup(id);
2259 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11002260 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002261
Damien Miller95def091999-11-25 00:26:21 +11002262 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10002263 if (c->type != SSH_CHANNEL_OPEN &&
2264 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002265 return;
2266
Damien Miller95def091999-11-25 00:26:21 +11002267 /* Get the data. */
Damien Millerdb255ca2008-05-19 14:59:37 +10002268 data = packet_get_string_ptr(&data_len);
Damien Millerb38eff82000-04-01 11:09:21 +10002269
Damien Millera04ad492004-01-21 11:02:09 +11002270 /*
2271 * Ignore data for protocol > 1.3 if output end is no longer open.
2272 * For protocol 2 the sending side is reducing its window as it sends
2273 * data, so we must 'fake' consumption of the data in order to ensure
2274 * that window updates are sent back. Otherwise the connection might
2275 * deadlock.
2276 */
2277 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
2278 if (compat20) {
2279 c->local_window -= data_len;
2280 c->local_consumed += data_len;
2281 }
Damien Millera04ad492004-01-21 11:02:09 +11002282 return;
2283 }
2284
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002285 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10002286 if (data_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10002287 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller33b13562000-04-04 14:38:59 +10002288 c->self, data_len, c->local_maxpacket);
2289 }
2290 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002291 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002292 c->self, data_len, c->local_window);
Damien Miller33b13562000-04-04 14:38:59 +10002293 return;
2294 }
2295 c->local_window -= data_len;
Damien Miller33b13562000-04-04 14:38:59 +10002296 }
Damien Millerd27b9472005-12-13 19:29:02 +11002297 if (c->datagram)
2298 buffer_put_string(&c->output, data, data_len);
2299 else
2300 buffer_append(&c->output, data, data_len);
Damien Millerdb255ca2008-05-19 14:59:37 +10002301 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002302}
Ben Lindstrome9c99912001-06-09 00:41:05 +00002303
Damien Millerd79b4242006-03-31 23:11:44 +11002304/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002305void
Damien Miller630d6f42002-01-22 23:17:30 +11002306channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002307{
2308 int id;
Damien Miller33b13562000-04-04 14:38:59 +10002309 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00002310 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10002311 Channel *c;
2312
2313 /* Get the channel number and verify it. */
2314 id = packet_get_int();
2315 c = channel_lookup(id);
2316
2317 if (c == NULL)
2318 packet_disconnect("Received extended_data for bad channel %d.", id);
2319 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002320 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10002321 return;
2322 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002323 if (c->flags & CHAN_EOF_RCVD) {
2324 if (datafellows & SSH_BUG_EXTEOF)
2325 debug("channel %d: accepting ext data after eof", id);
2326 else
2327 packet_disconnect("Received extended_data after EOF "
2328 "on channel %d.", id);
2329 }
Damien Miller33b13562000-04-04 14:38:59 +10002330 tcode = packet_get_int();
2331 if (c->efd == -1 ||
2332 c->extended_usage != CHAN_EXTENDED_WRITE ||
2333 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002334 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002335 return;
2336 }
2337 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002338 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002339 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002340 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002341 c->self, data_len, c->local_window);
2342 xfree(data);
2343 return;
2344 }
Damien Millerd3444942000-09-30 14:20:03 +11002345 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002346 c->local_window -= data_len;
2347 buffer_append(&c->extended, data, data_len);
2348 xfree(data);
2349}
2350
Damien Millerd79b4242006-03-31 23:11:44 +11002351/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002352void
Damien Miller630d6f42002-01-22 23:17:30 +11002353channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002354{
2355 int id;
2356 Channel *c;
2357
Damien Millerb38eff82000-04-01 11:09:21 +10002358 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002359 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002360 c = channel_lookup(id);
2361 if (c == NULL)
2362 packet_disconnect("Received ieof for nonexistent channel %d.", id);
2363 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002364
2365 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002366 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002367 debug("channel %d: FORCE input drain", c->self);
2368 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002369 if (buffer_len(&c->input) == 0)
2370 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002371 }
2372
Damien Millerb38eff82000-04-01 11:09:21 +10002373}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002374
Damien Millerd79b4242006-03-31 23:11:44 +11002375/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002376void
Damien Miller630d6f42002-01-22 23:17:30 +11002377channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002378{
Damien Millerb38eff82000-04-01 11:09:21 +10002379 int id;
2380 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002381
Damien Millerb38eff82000-04-01 11:09:21 +10002382 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002383 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002384 c = channel_lookup(id);
2385 if (c == NULL)
2386 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002387
2388 /*
2389 * Send a confirmation that we have closed the channel and no more
2390 * data is coming for it.
2391 */
Damien Miller95def091999-11-25 00:26:21 +11002392 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002393 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002394 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002395
Damien Miller5428f641999-11-25 11:54:57 +11002396 /*
2397 * If the channel is in closed state, we have sent a close request,
2398 * and the other side will eventually respond with a confirmation.
2399 * Thus, we cannot free the channel here, because then there would be
2400 * no-one to receive the confirmation. The channel gets freed when
2401 * the confirmation arrives.
2402 */
Damien Millerb38eff82000-04-01 11:09:21 +10002403 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002404 /*
2405 * Not a closed channel - mark it as draining, which will
2406 * cause it to be freed later.
2407 */
Damien Miller76765c02002-01-22 23:21:15 +11002408 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002409 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002410 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002411}
2412
Damien Millerb38eff82000-04-01 11:09:21 +10002413/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Millerd79b4242006-03-31 23:11:44 +11002414/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002415void
Damien Miller630d6f42002-01-22 23:17:30 +11002416channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002417{
Damien Millerb38eff82000-04-01 11:09:21 +10002418 int id = packet_get_int();
2419 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002420
Damien Miller48b03fc2002-01-22 23:11:40 +11002421 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002422 if (c == NULL)
2423 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2424 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002425}
2426
Damien Millerd79b4242006-03-31 23:11:44 +11002427/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002428void
Damien Miller630d6f42002-01-22 23:17:30 +11002429channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002430{
2431 int id = packet_get_int();
2432 Channel *c = channel_lookup(id);
2433
Damien Miller48b03fc2002-01-22 23:11:40 +11002434 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002435 if (c == NULL)
2436 packet_disconnect("Received close confirmation for "
2437 "out-of-range channel %d.", id);
2438 if (c->type != SSH_CHANNEL_CLOSED)
2439 packet_disconnect("Received close confirmation for "
2440 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002441 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002442}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002443
Damien Millerd79b4242006-03-31 23:11:44 +11002444/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002445void
Damien Miller630d6f42002-01-22 23:17:30 +11002446channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002447{
Damien Millerb38eff82000-04-01 11:09:21 +10002448 int id, remote_id;
2449 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002450
Damien Millerb38eff82000-04-01 11:09:21 +10002451 id = packet_get_int();
2452 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002453
Damien Millerb38eff82000-04-01 11:09:21 +10002454 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2455 packet_disconnect("Received open confirmation for "
2456 "non-opening channel %d.", id);
2457 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002458 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002459 c->remote_id = remote_id;
2460 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002461
2462 if (compat20) {
2463 c->remote_window = packet_get_int();
2464 c->remote_maxpacket = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002465 if (c->open_confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002466 debug2("callback start");
Damien Millerd530f5f2010-05-21 14:57:10 +10002467 c->open_confirm(c->self, 1, c->open_confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002468 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002469 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002470 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002471 c->remote_window, c->remote_maxpacket);
2472 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002473 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002474}
2475
Ben Lindstrombba81212001-06-25 05:01:22 +00002476static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002477reason2txt(int reason)
2478{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002479 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002480 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2481 return "administratively prohibited";
2482 case SSH2_OPEN_CONNECT_FAILED:
2483 return "connect failed";
2484 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2485 return "unknown channel type";
2486 case SSH2_OPEN_RESOURCE_SHORTAGE:
2487 return "resource shortage";
2488 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002489 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002490}
2491
Damien Millerd79b4242006-03-31 23:11:44 +11002492/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002493void
Damien Miller630d6f42002-01-22 23:17:30 +11002494channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002495{
Kevin Steves12057502001-02-05 14:54:34 +00002496 int id, reason;
2497 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002498 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002499
Damien Millerb38eff82000-04-01 11:09:21 +10002500 id = packet_get_int();
2501 c = channel_lookup(id);
2502
2503 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2504 packet_disconnect("Received open failure for "
2505 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002506 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002507 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002508 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002509 msg = packet_get_string(NULL);
2510 lang = packet_get_string(NULL);
2511 }
Damien Miller996acd22003-04-09 20:59:48 +10002512 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002513 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002514 if (msg != NULL)
2515 xfree(msg);
2516 if (lang != NULL)
2517 xfree(lang);
Damien Millerd530f5f2010-05-21 14:57:10 +10002518 if (c->open_confirm) {
2519 debug2("callback start");
2520 c->open_confirm(c->self, 0, c->open_confirm_ctx);
2521 debug2("callback done");
2522 }
Damien Miller33b13562000-04-04 14:38:59 +10002523 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002524 packet_check_eom();
Damien Miller7a606212009-01-28 16:22:34 +11002525 /* Schedule the channel for cleanup/deletion. */
2526 chan_mark_dead(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002527}
2528
Damien Millerd79b4242006-03-31 23:11:44 +11002529/* ARGSUSED */
Damien Miller33b13562000-04-04 14:38:59 +10002530void
Damien Miller630d6f42002-01-22 23:17:30 +11002531channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002532{
2533 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002534 int id;
2535 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002536
2537 if (!compat20)
2538 return;
2539
2540 /* Get the channel number and verify it. */
2541 id = packet_get_int();
2542 c = channel_lookup(id);
2543
Damien Millerd47c62a2005-12-13 19:33:57 +11002544 if (c == NULL) {
2545 logit("Received window adjust for non-open channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002546 return;
2547 }
2548 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002549 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002550 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002551 c->remote_window += adjust;
2552}
2553
Damien Millerd79b4242006-03-31 23:11:44 +11002554/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002555void
Damien Miller630d6f42002-01-22 23:17:30 +11002556channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002557{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002558 Channel *c = NULL;
2559 u_short host_port;
2560 char *host, *originator_string;
Damien Millerbd740252008-05-19 15:37:09 +10002561 int remote_id;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002562
Ben Lindstrome9c99912001-06-09 00:41:05 +00002563 remote_id = packet_get_int();
2564 host = packet_get_string(NULL);
2565 host_port = packet_get_int();
2566
2567 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2568 originator_string = packet_get_string(NULL);
2569 } else {
2570 originator_string = xstrdup("unknown (remote did not supply name)");
2571 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002572 packet_check_eom();
Damien Millerbd740252008-05-19 15:37:09 +10002573 c = channel_connect_to(host, host_port,
2574 "connected socket", originator_string);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002575 xfree(originator_string);
Damien Millerbd740252008-05-19 15:37:09 +10002576 xfree(host);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002577 if (c == NULL) {
2578 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2579 packet_put_int(remote_id);
2580 packet_send();
Damien Millerbd740252008-05-19 15:37:09 +10002581 } else
2582 c->remote_id = remote_id;
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002583}
2584
Damien Millerb84886b2008-05-19 15:05:07 +10002585/* ARGSUSED */
2586void
2587channel_input_status_confirm(int type, u_int32_t seq, void *ctxt)
2588{
2589 Channel *c;
2590 struct channel_confirm *cc;
Damien Miller16a73072008-12-08 09:55:25 +11002591 int id;
Damien Millerb84886b2008-05-19 15:05:07 +10002592
2593 /* Reset keepalive timeout */
Darren Tuckerf7288d72009-06-21 18:12:20 +10002594 packet_set_alive_timeouts(0);
Damien Millerb84886b2008-05-19 15:05:07 +10002595
Damien Miller16a73072008-12-08 09:55:25 +11002596 id = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002597 packet_check_eom();
2598
Damien Miller16a73072008-12-08 09:55:25 +11002599 debug2("channel_input_status_confirm: type %d id %d", type, id);
Damien Millerb84886b2008-05-19 15:05:07 +10002600
Damien Miller16a73072008-12-08 09:55:25 +11002601 if ((c = channel_lookup(id)) == NULL) {
2602 logit("channel_input_status_confirm: %d: unknown", id);
Damien Millerb84886b2008-05-19 15:05:07 +10002603 return;
2604 }
2605 ;
2606 if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
2607 return;
2608 cc->cb(type, c, cc->ctx);
2609 TAILQ_REMOVE(&c->status_confirms, cc, entry);
2610 bzero(cc, sizeof(*cc));
2611 xfree(cc);
2612}
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002613
Ben Lindstrome9c99912001-06-09 00:41:05 +00002614/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002615
Ben Lindstrom908afed2001-10-03 17:34:59 +00002616void
2617channel_set_af(int af)
2618{
2619 IPv4or6 = af;
2620}
2621
Damien Millerb16461c2002-01-22 23:29:22 +11002622static int
Damien Miller4bf648f2009-02-14 16:28:21 +11002623channel_setup_fwd_listener(int type, const char *listen_addr,
2624 u_short listen_port, int *allocated_listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002625 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002626{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002627 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002628 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002629 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002630 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002631 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller4bf648f2009-02-14 16:28:21 +11002632 in_port_t *lport_p;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002633
Damien Millerb16461c2002-01-22 23:29:22 +11002634 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2635 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002636 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002637
Damien Millerb16461c2002-01-22 23:29:22 +11002638 if (host == NULL) {
2639 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002640 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002641 }
Damien Miller9576ac42009-01-28 16:30:33 +11002642 if (strlen(host) >= NI_MAXHOST) {
Kevin Steves12057502001-02-05 14:54:34 +00002643 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002644 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002645 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002646
Damien Miller5428f641999-11-25 11:54:57 +11002647 /*
Damien Millerf91ee4c2005-03-01 21:24:33 +11002648 * Determine whether or not a port forward listens to loopback,
Darren Tucker47eede72005-03-14 23:08:12 +11002649 * specified address or wildcard. On the client, a specified bind
2650 * address will always override gateway_ports. On the server, a
2651 * gateway_ports of 1 (``yes'') will override the client's
2652 * specification and force a wildcard bind, whereas a value of 2
2653 * (``clientspecified'') will bind to whatever address the client
Damien Millerf91ee4c2005-03-01 21:24:33 +11002654 * asked for.
2655 *
2656 * Special-case listen_addrs are:
2657 *
2658 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2659 * "" (empty string), "*" -> wildcard v4/v6
2660 * "localhost" -> loopback v4/v6
2661 */
2662 addr = NULL;
2663 if (listen_addr == NULL) {
2664 /* No address specified: default to gateway_ports setting */
2665 if (gateway_ports)
2666 wildcard = 1;
2667 } else if (gateway_ports || is_client) {
2668 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
Damien Miller3de49f82008-02-10 22:25:24 +11002669 strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
Damien Millerf91ee4c2005-03-01 21:24:33 +11002670 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2671 (!is_client && gateway_ports == 1))
2672 wildcard = 1;
2673 else if (strcmp(listen_addr, "localhost") != 0)
2674 addr = listen_addr;
2675 }
2676
2677 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2678 type, wildcard, (addr == NULL) ? "NULL" : addr);
2679
2680 /*
Damien Miller34132e52000-01-14 15:45:46 +11002681 * getaddrinfo returns a loopback address if the hostname is
2682 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002683 */
Damien Miller34132e52000-01-14 15:45:46 +11002684 memset(&hints, 0, sizeof(hints));
2685 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002686 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002687 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002688 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002689 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2690 if (addr == NULL) {
2691 /* This really shouldn't happen */
2692 packet_disconnect("getaddrinfo: fatal error: %s",
Darren Tucker4abde772007-12-29 02:43:51 +11002693 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002694 } else {
Damien Millera7270302005-07-06 09:36:05 +10002695 error("channel_setup_fwd_listener: "
Darren Tucker4abde772007-12-29 02:43:51 +11002696 "getaddrinfo(%.64s): %s", addr,
2697 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002698 }
Damien Millera7270302005-07-06 09:36:05 +10002699 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002700 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002701 if (allocated_listen_port != NULL)
2702 *allocated_listen_port = 0;
Damien Miller34132e52000-01-14 15:45:46 +11002703 for (ai = aitop; ai; ai = ai->ai_next) {
Damien Miller4bf648f2009-02-14 16:28:21 +11002704 switch (ai->ai_family) {
2705 case AF_INET:
2706 lport_p = &((struct sockaddr_in *)ai->ai_addr)->
2707 sin_port;
2708 break;
2709 case AF_INET6:
2710 lport_p = &((struct sockaddr_in6 *)ai->ai_addr)->
2711 sin6_port;
2712 break;
2713 default:
Damien Miller34132e52000-01-14 15:45:46 +11002714 continue;
Damien Miller4bf648f2009-02-14 16:28:21 +11002715 }
2716 /*
2717 * If allocating a port for -R forwards, then use the
2718 * same port for all address families.
2719 */
2720 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2721 allocated_listen_port != NULL && *allocated_listen_port > 0)
2722 *lport_p = htons(*allocated_listen_port);
2723
Damien Miller34132e52000-01-14 15:45:46 +11002724 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2725 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002726 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002727 continue;
2728 }
2729 /* Create a port to listen for the host. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11002730 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002731 if (sock < 0) {
2732 /* this is no error since kernel may not support ipv6 */
2733 verbose("socket: %.100s", strerror(errno));
2734 continue;
2735 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002736
2737 channel_set_reuseaddr(sock);
Damien Miller04ee0f82009-11-18 17:48:30 +11002738 if (ai->ai_family == AF_INET6)
2739 sock_set_v6only(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002740
Damien Miller4bf648f2009-02-14 16:28:21 +11002741 debug("Local forwarding listening on %s port %s.",
2742 ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002743
Damien Miller34132e52000-01-14 15:45:46 +11002744 /* Bind the socket to the address. */
2745 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2746 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002747 if (!ai->ai_next)
2748 error("bind: %.100s", strerror(errno));
2749 else
2750 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002751
Damien Miller34132e52000-01-14 15:45:46 +11002752 close(sock);
2753 continue;
2754 }
2755 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002756 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002757 error("listen: %.100s", strerror(errno));
2758 close(sock);
2759 continue;
2760 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002761
2762 /*
2763 * listen_port == 0 requests a dynamically allocated port -
2764 * record what we got.
2765 */
2766 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2767 allocated_listen_port != NULL &&
2768 *allocated_listen_port == 0) {
2769 *allocated_listen_port = get_sock_port(sock, 1);
2770 debug("Allocated listen port %d",
2771 *allocated_listen_port);
2772 }
2773
Damien Miller34132e52000-01-14 15:45:46 +11002774 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002775 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002776 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002777 0, "port listener", 1);
Damien Millera1c1b6c2009-01-28 16:29:49 +11002778 c->path = xstrdup(host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002779 c->host_port = port_to_connect;
2780 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002781 success = 1;
2782 }
2783 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002784 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002785 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002786 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002787 return success;
Damien Miller95def091999-11-25 00:26:21 +11002788}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002789
Darren Tuckere7066df2004-05-24 10:18:05 +10002790int
2791channel_cancel_rport_listener(const char *host, u_short port)
2792{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002793 u_int i;
2794 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002795
Darren Tucker47eede72005-03-14 23:08:12 +11002796 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002797 Channel *c = channels[i];
2798
2799 if (c != NULL && c->type == SSH_CHANNEL_RPORT_LISTENER &&
Damien Millera1c1b6c2009-01-28 16:29:49 +11002800 strcmp(c->path, host) == 0 && c->listening_port == port) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002801 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002802 channel_free(c);
2803 found = 1;
2804 }
2805 }
2806
2807 return (found);
2808}
2809
Damien Millerb16461c2002-01-22 23:29:22 +11002810/* protocol local port fwd, used by ssh (and sshd in v1) */
2811int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002812channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002813 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2814{
2815 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002816 listen_host, listen_port, NULL, host_to_connect, port_to_connect,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002817 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002818}
2819
2820/* protocol v2 remote port fwd, used by sshd */
2821int
2822channel_setup_remote_fwd_listener(const char *listen_address,
Damien Miller4bf648f2009-02-14 16:28:21 +11002823 u_short listen_port, int *allocated_listen_port, int gateway_ports)
Damien Millerb16461c2002-01-22 23:29:22 +11002824{
2825 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002826 listen_address, listen_port, allocated_listen_port,
2827 NULL, 0, gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002828}
2829
Damien Miller5428f641999-11-25 11:54:57 +11002830/*
2831 * Initiate forwarding of connections to port "port" on remote host through
2832 * the secure channel to host:port from local side.
2833 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002834
Darren Tuckere7d4b192006-07-12 22:17:10 +10002835int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002836channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002837 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002838{
Damien Millerdff50992002-01-22 23:16:32 +11002839 int type, success = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002840
Damien Miller95def091999-11-25 00:26:21 +11002841 /* Record locally that connection to this host/port is permitted. */
2842 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2843 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002844
Damien Miller95def091999-11-25 00:26:21 +11002845 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002846 if (compat20) {
Damien Millerf91ee4c2005-03-01 21:24:33 +11002847 const char *address_to_bind;
Damien Miller1ec46262007-01-05 16:26:45 +11002848 if (listen_host == NULL) {
2849 if (datafellows & SSH_BUG_RFWD_ADDR)
2850 address_to_bind = "127.0.0.1";
2851 else
2852 address_to_bind = "localhost";
2853 } else if (*listen_host == '\0' ||
2854 strcmp(listen_host, "*") == 0) {
2855 if (datafellows & SSH_BUG_RFWD_ADDR)
2856 address_to_bind = "0.0.0.0";
2857 else
2858 address_to_bind = "";
2859 } else
Damien Millerf91ee4c2005-03-01 21:24:33 +11002860 address_to_bind = listen_host;
2861
Damien Miller33b13562000-04-04 14:38:59 +10002862 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2863 packet_put_cstring("tcpip-forward");
Damien Miller2797f7f2002-04-23 21:09:44 +10002864 packet_put_char(1); /* boolean: want reply */
Damien Miller33b13562000-04-04 14:38:59 +10002865 packet_put_cstring(address_to_bind);
2866 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002867 packet_send();
2868 packet_write_wait();
2869 /* Assume that server accepts the request */
2870 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002871 } else {
2872 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002873 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002874 packet_put_cstring(host_to_connect);
2875 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002876 packet_send();
2877 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002878
2879 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002880 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002881 switch (type) {
2882 case SSH_SMSG_SUCCESS:
2883 success = 1;
2884 break;
2885 case SSH_SMSG_FAILURE:
Damien Miller0bc1bd82000-11-13 22:57:25 +11002886 break;
2887 default:
2888 /* Unknown packet */
2889 packet_disconnect("Protocol error for port forward request:"
2890 "received packet type %d.", type);
2891 }
2892 }
2893 if (success) {
2894 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2895 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2896 permitted_opens[num_permitted_opens].listen_port = listen_port;
2897 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002898 }
Darren Tuckere7d4b192006-07-12 22:17:10 +10002899 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002900}
2901
Damien Miller5428f641999-11-25 11:54:57 +11002902/*
Darren Tuckerfc959702004-07-17 16:12:08 +10002903 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10002904 * local side.
2905 */
Darren Tuckere7066df2004-05-24 10:18:05 +10002906void
Damien Millerf91ee4c2005-03-01 21:24:33 +11002907channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10002908{
2909 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10002910
2911 if (!compat20)
2912 return;
2913
2914 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10002915 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10002916 permitted_opens[i].listen_port == port)
2917 break;
2918 }
2919 if (i >= num_permitted_opens) {
2920 debug("%s: requested forward not found", __func__);
2921 return;
2922 }
2923 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2924 packet_put_cstring("cancel-tcpip-forward");
2925 packet_put_char(0);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002926 packet_put_cstring(host == NULL ? "" : host);
Darren Tuckere7066df2004-05-24 10:18:05 +10002927 packet_put_int(port);
2928 packet_send();
2929
2930 permitted_opens[i].listen_port = 0;
2931 permitted_opens[i].port_to_connect = 0;
Damien Miller0a0176e2005-11-05 15:07:59 +11002932 xfree(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10002933 permitted_opens[i].host_to_connect = NULL;
2934}
2935
2936/*
Damien Miller5428f641999-11-25 11:54:57 +11002937 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2938 * listening for the port, and sends back a success reply (or disconnect
Darren Tuckere7d4b192006-07-12 22:17:10 +10002939 * message if there was an error).
Damien Miller5428f641999-11-25 11:54:57 +11002940 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10002941int
Damien Millere247cc42000-05-07 12:03:14 +10002942channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002943{
Damien Milleraae6c611999-12-06 11:47:28 +11002944 u_short port, host_port;
Darren Tuckere7d4b192006-07-12 22:17:10 +10002945 int success = 0;
Damien Miller95def091999-11-25 00:26:21 +11002946 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002947
Damien Miller95def091999-11-25 00:26:21 +11002948 /* Get arguments from the packet. */
2949 port = packet_get_int();
2950 hostname = packet_get_string(NULL);
2951 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002952
Damien Millerbac2d8a2000-09-05 16:13:06 +11002953#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002954 /*
2955 * Check that an unprivileged user is not trying to forward a
2956 * privileged port.
2957 */
Damien Miller95def091999-11-25 00:26:21 +11002958 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10002959 packet_disconnect(
2960 "Requested forwarding of port %d but user is not root.",
2961 port);
2962 if (host_port == 0)
2963 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11002964#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10002965
Damien Miller0bc1bd82000-11-13 22:57:25 +11002966 /* Initiate forwarding */
Darren Tuckere7d4b192006-07-12 22:17:10 +10002967 success = channel_setup_local_fwd_listener(NULL, port, hostname,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002968 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002969
2970 /* Free the argument string. */
2971 xfree(hostname);
Darren Tuckere7d4b192006-07-12 22:17:10 +10002972
2973 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002974}
2975
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002976/*
2977 * Permits opening to any host/port if permitted_opens[] is empty. This is
2978 * usually called by the server, because the user could connect to any port
2979 * anyway, and the server has no way to know but to trust the client anyway.
2980 */
2981void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002982channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002983{
2984 if (num_permitted_opens == 0)
2985 all_opens_permitted = 1;
2986}
2987
Ben Lindstroma3700052001-04-05 23:26:32 +00002988void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002989channel_add_permitted_opens(char *host, int port)
2990{
2991 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
Darren Tuckere7d4b192006-07-12 22:17:10 +10002992 fatal("channel_add_permitted_opens: too many forwards");
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002993 debug("allow port forwarding to host %s port %d", host, port);
2994
2995 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2996 permitted_opens[num_permitted_opens].port_to_connect = port;
2997 num_permitted_opens++;
2998
2999 all_opens_permitted = 0;
3000}
3001
Damien Millera765cf42006-07-24 14:08:13 +10003002int
Damien Miller9b439df2006-07-24 14:04:00 +10003003channel_add_adm_permitted_opens(char *host, int port)
3004{
3005 if (num_adm_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
3006 fatal("channel_add_adm_permitted_opens: too many forwards");
Damien Millera765cf42006-07-24 14:08:13 +10003007 debug("config allows port forwarding to host %s port %d", host, port);
Damien Miller9b439df2006-07-24 14:04:00 +10003008
3009 permitted_adm_opens[num_adm_permitted_opens].host_to_connect
3010 = xstrdup(host);
3011 permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
Damien Millera765cf42006-07-24 14:08:13 +10003012 return ++num_adm_permitted_opens;
Damien Miller9b439df2006-07-24 14:04:00 +10003013}
3014
3015void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003016channel_clear_permitted_opens(void)
3017{
3018 int i;
3019
3020 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10003021 if (permitted_opens[i].host_to_connect != NULL)
3022 xfree(permitted_opens[i].host_to_connect);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003023 num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +10003024}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003025
Damien Miller9b439df2006-07-24 14:04:00 +10003026void
3027channel_clear_adm_permitted_opens(void)
3028{
3029 int i;
3030
3031 for (i = 0; i < num_adm_permitted_opens; i++)
3032 if (permitted_adm_opens[i].host_to_connect != NULL)
3033 xfree(permitted_adm_opens[i].host_to_connect);
3034 num_adm_permitted_opens = 0;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003035}
3036
Darren Tuckere7140f22008-06-10 23:01:51 +10003037void
3038channel_print_adm_permitted_opens(void)
3039{
Damien Miller6ef17492008-07-16 22:42:06 +10003040 int i;
Darren Tuckere7140f22008-06-10 23:01:51 +10003041
Damien Millerb53d8a12009-01-28 16:13:04 +11003042 printf("permitopen");
Darren Tucker22662e82008-11-11 16:40:22 +11003043 if (num_adm_permitted_opens == 0) {
Damien Millerb53d8a12009-01-28 16:13:04 +11003044 printf(" any\n");
Darren Tucker22662e82008-11-11 16:40:22 +11003045 return;
3046 }
Darren Tuckere7140f22008-06-10 23:01:51 +10003047 for (i = 0; i < num_adm_permitted_opens; i++)
3048 if (permitted_adm_opens[i].host_to_connect != NULL)
3049 printf(" %s:%d", permitted_adm_opens[i].host_to_connect,
3050 permitted_adm_opens[i].port_to_connect);
Damien Millerb53d8a12009-01-28 16:13:04 +11003051 printf("\n");
Darren Tuckere7140f22008-06-10 23:01:51 +10003052}
3053
Damien Millerbd740252008-05-19 15:37:09 +10003054/* Try to start non-blocking connect to next host in cctx list */
Ben Lindstrombba81212001-06-25 05:01:22 +00003055static int
Damien Millerbd740252008-05-19 15:37:09 +10003056connect_next(struct channel_connect *cctx)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003057{
Damien Millerbd740252008-05-19 15:37:09 +10003058 int sock, saved_errno;
Damien Miller34132e52000-01-14 15:45:46 +11003059 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller95def091999-11-25 00:26:21 +11003060
Damien Millerbd740252008-05-19 15:37:09 +10003061 for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
3062 if (cctx->ai->ai_family != AF_INET &&
3063 cctx->ai->ai_family != AF_INET6)
Damien Miller34132e52000-01-14 15:45:46 +11003064 continue;
Damien Millerbd740252008-05-19 15:37:09 +10003065 if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
3066 ntop, sizeof(ntop), strport, sizeof(strport),
3067 NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
3068 error("connect_next: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11003069 continue;
3070 }
Darren Tucker7bd98e72010-01-10 10:31:12 +11003071 if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
3072 cctx->ai->ai_protocol)) == -1) {
Damien Millerbd740252008-05-19 15:37:09 +10003073 if (cctx->ai->ai_next == NULL)
Damien Millerb46b9f32003-01-10 21:45:12 +11003074 error("socket: %.100s", strerror(errno));
3075 else
3076 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003077 continue;
3078 }
Damien Miller232711f2004-06-15 10:35:30 +10003079 if (set_nonblock(sock) == -1)
3080 fatal("%s: set_nonblock(%d)", __func__, sock);
Damien Millerbd740252008-05-19 15:37:09 +10003081 if (connect(sock, cctx->ai->ai_addr,
3082 cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
3083 debug("connect_next: host %.100s ([%.100s]:%s): "
3084 "%.100s", cctx->host, ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11003085 strerror(errno));
Damien Millerbd740252008-05-19 15:37:09 +10003086 saved_errno = errno;
Damien Miller34132e52000-01-14 15:45:46 +11003087 close(sock);
Damien Millerbd740252008-05-19 15:37:09 +10003088 errno = saved_errno;
Kevin Stevesef4eea92001-02-05 12:42:17 +00003089 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11003090 }
Damien Millerbd740252008-05-19 15:37:09 +10003091 debug("connect_next: host %.100s ([%.100s]:%s) "
3092 "in progress, fd=%d", cctx->host, ntop, strport, sock);
3093 cctx->ai = cctx->ai->ai_next;
3094 set_nodelay(sock);
3095 return sock;
Damien Miller34132e52000-01-14 15:45:46 +11003096 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11003097 return -1;
3098}
Damien Millerb38eff82000-04-01 11:09:21 +10003099
Damien Millerbd740252008-05-19 15:37:09 +10003100static void
3101channel_connect_ctx_free(struct channel_connect *cctx)
3102{
3103 xfree(cctx->host);
3104 if (cctx->aitop)
3105 freeaddrinfo(cctx->aitop);
3106 bzero(cctx, sizeof(*cctx));
3107 cctx->host = NULL;
3108 cctx->ai = cctx->aitop = NULL;
3109}
3110
3111/* Return CONNECTING channel to remote host, port */
3112static Channel *
3113connect_to(const char *host, u_short port, char *ctype, char *rname)
3114{
3115 struct addrinfo hints;
3116 int gaierr;
3117 int sock = -1;
3118 char strport[NI_MAXSERV];
3119 struct channel_connect cctx;
3120 Channel *c;
3121
Damien Miller2bcb8662008-07-12 17:12:29 +10003122 memset(&cctx, 0, sizeof(cctx));
Damien Millerbd740252008-05-19 15:37:09 +10003123 memset(&hints, 0, sizeof(hints));
3124 hints.ai_family = IPv4or6;
3125 hints.ai_socktype = SOCK_STREAM;
3126 snprintf(strport, sizeof strport, "%d", port);
3127 if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) {
3128 error("connect_to %.100s: unknown host (%s)", host,
3129 ssh_gai_strerror(gaierr));
3130 return NULL;
3131 }
3132
3133 cctx.host = xstrdup(host);
3134 cctx.port = port;
3135 cctx.ai = cctx.aitop;
3136
3137 if ((sock = connect_next(&cctx)) == -1) {
3138 error("connect to %.100s port %d failed: %s",
3139 host, port, strerror(errno));
3140 channel_connect_ctx_free(&cctx);
3141 return NULL;
3142 }
3143 c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
3144 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
3145 c->connect_ctx = cctx;
3146 return c;
3147}
3148
3149Channel *
3150channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname)
3151{
3152 int i;
3153
3154 for (i = 0; i < num_permitted_opens; i++) {
3155 if (permitted_opens[i].host_to_connect != NULL &&
3156 permitted_opens[i].listen_port == listen_port) {
3157 return connect_to(
3158 permitted_opens[i].host_to_connect,
3159 permitted_opens[i].port_to_connect, ctype, rname);
3160 }
3161 }
3162 error("WARNING: Server requests forwarding for unknown listen_port %d",
3163 listen_port);
3164 return NULL;
3165}
3166
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003167/* Check if connecting to that port is permitted and connect. */
Damien Millerbd740252008-05-19 15:37:09 +10003168Channel *
3169channel_connect_to(const char *host, u_short port, char *ctype, char *rname)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003170{
Damien Miller9b439df2006-07-24 14:04:00 +10003171 int i, permit, permit_adm = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003172
3173 permit = all_opens_permitted;
3174 if (!permit) {
3175 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10003176 if (permitted_opens[i].host_to_connect != NULL &&
3177 permitted_opens[i].port_to_connect == port &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003178 strcmp(permitted_opens[i].host_to_connect, host) == 0)
3179 permit = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003180 }
Damien Miller9b439df2006-07-24 14:04:00 +10003181
3182 if (num_adm_permitted_opens > 0) {
3183 permit_adm = 0;
3184 for (i = 0; i < num_adm_permitted_opens; i++)
3185 if (permitted_adm_opens[i].host_to_connect != NULL &&
3186 permitted_adm_opens[i].port_to_connect == port &&
3187 strcmp(permitted_adm_opens[i].host_to_connect, host)
3188 == 0)
3189 permit_adm = 1;
3190 }
3191
3192 if (!permit || !permit_adm) {
Damien Miller996acd22003-04-09 20:59:48 +10003193 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003194 "but the request was denied.", host, port);
Damien Millerbd740252008-05-19 15:37:09 +10003195 return NULL;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003196 }
Damien Millerbd740252008-05-19 15:37:09 +10003197 return connect_to(host, port, ctype, rname);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003198}
3199
Damien Miller0e220db2004-06-15 10:34:08 +10003200void
3201channel_send_window_changes(void)
3202{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10003203 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10003204 struct winsize ws;
3205
3206 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11003207 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10003208 channels[i]->type != SSH_CHANNEL_OPEN)
3209 continue;
3210 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
3211 continue;
3212 channel_request_start(i, "window-change", 0);
Damien Miller71a73672006-03-26 14:04:36 +11003213 packet_put_int((u_int)ws.ws_col);
3214 packet_put_int((u_int)ws.ws_row);
3215 packet_put_int((u_int)ws.ws_xpixel);
3216 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10003217 packet_send();
3218 }
3219}
3220
Ben Lindstrome9c99912001-06-09 00:41:05 +00003221/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003222
Damien Miller5428f641999-11-25 11:54:57 +11003223/*
3224 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003225 * Returns 0 and a suitable display number for the DISPLAY variable
3226 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11003227 */
Kevin Steves366298c2001-12-19 17:58:01 +00003228int
Damien Miller95c249f2002-02-05 12:11:34 +11003229x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10003230 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003231{
Damien Millere7378562001-12-21 14:58:35 +11003232 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11003233 int display_number, sock;
3234 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11003235 struct addrinfo hints, *ai, *aitop;
3236 char strport[NI_MAXSERV];
3237 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003238
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003239 if (chanids == NULL)
3240 return -1;
3241
Damien Millera34a28b1999-12-14 10:47:15 +11003242 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11003243 display_number < MAX_DISPLAYS;
3244 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11003245 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11003246 memset(&hints, 0, sizeof(hints));
3247 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11003248 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11003249 hints.ai_socktype = SOCK_STREAM;
3250 snprintf(strport, sizeof strport, "%d", port);
3251 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003252 error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00003253 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003254 }
Damien Miller34132e52000-01-14 15:45:46 +11003255 for (ai = aitop; ai; ai = ai->ai_next) {
3256 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
3257 continue;
Darren Tucker7bd98e72010-01-10 10:31:12 +11003258 sock = socket(ai->ai_family, ai->ai_socktype,
3259 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003260 if (sock < 0) {
Damien Miller6480c632010-03-26 11:09:44 +11003261 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)
3262#ifdef EPFNOSUPPORT
3263 && (errno != EPFNOSUPPORT)
3264#endif
3265 ) {
Damien Millere2192732000-01-17 13:22:55 +11003266 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10003267 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00003268 return -1;
Damien Millere2192732000-01-17 13:22:55 +11003269 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11003270 debug("x11_create_display_inet: Socket family %d not supported",
3271 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11003272 continue;
3273 }
Damien Miller34132e52000-01-14 15:45:46 +11003274 }
Damien Miller04ee0f82009-11-18 17:48:30 +11003275 if (ai->ai_family == AF_INET6)
3276 sock_set_v6only(sock);
Damien Miller4401e452008-06-12 06:05:12 +10003277 if (x11_use_localhost)
3278 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11003279 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003280 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003281 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11003282
Damien Miller34132e52000-01-14 15:45:46 +11003283 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11003284 close(socks[n]);
3285 }
3286 num_socks = 0;
3287 break;
3288 }
3289 socks[num_socks++] = sock;
3290 if (num_socks == NUM_SOCKS)
3291 break;
Damien Miller95def091999-11-25 00:26:21 +11003292 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00003293 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11003294 if (num_socks > 0)
3295 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003296 }
Damien Miller95def091999-11-25 00:26:21 +11003297 if (display_number >= MAX_DISPLAYS) {
3298 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00003299 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003300 }
Damien Miller95def091999-11-25 00:26:21 +11003301 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11003302 for (n = 0; n < num_socks; n++) {
3303 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11003304 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11003305 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003306 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00003307 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11003308 }
Damien Miller95def091999-11-25 00:26:21 +11003309 }
Damien Miller34132e52000-01-14 15:45:46 +11003310
Damien Miller34132e52000-01-14 15:45:46 +11003311 /* Allocate a channel for each socket. */
Damien Miller07d86be2006-03-26 14:19:21 +11003312 *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
Damien Miller34132e52000-01-14 15:45:46 +11003313 for (n = 0; n < num_socks; n++) {
3314 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11003315 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10003316 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
3317 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003318 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11003319 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003320 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11003321 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003322 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003323
Kevin Steves366298c2001-12-19 17:58:01 +00003324 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003325 *display_numberp = display_number;
3326 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003327}
3328
Ben Lindstrombba81212001-06-25 05:01:22 +00003329static int
Damien Miller819dbb62009-01-21 16:46:26 +11003330connect_local_xsocket_path(const char *pathname)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003331{
Damien Miller95def091999-11-25 00:26:21 +11003332 int sock;
3333 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003334
Damien Miller3afe3752001-12-21 12:39:51 +11003335 sock = socket(AF_UNIX, SOCK_STREAM, 0);
3336 if (sock < 0)
3337 error("socket: %.100s", strerror(errno));
3338 memset(&addr, 0, sizeof(addr));
3339 addr.sun_family = AF_UNIX;
Damien Miller819dbb62009-01-21 16:46:26 +11003340 strlcpy(addr.sun_path, pathname, sizeof addr.sun_path);
Damien Miller90967402006-03-26 14:07:26 +11003341 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
Damien Miller3afe3752001-12-21 12:39:51 +11003342 return sock;
3343 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11003344 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
3345 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003346}
3347
Damien Miller819dbb62009-01-21 16:46:26 +11003348static int
3349connect_local_xsocket(u_int dnr)
3350{
3351 char buf[1024];
3352 snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr);
3353 return connect_local_xsocket_path(buf);
3354}
3355
Damien Millerbd483e72000-04-30 10:00:53 +10003356int
3357x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003358{
Damien Miller57c4e872006-03-31 23:11:07 +11003359 u_int display_number;
Damien Miller95def091999-11-25 00:26:21 +11003360 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10003361 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11003362 struct addrinfo hints, *ai, *aitop;
3363 char strport[NI_MAXSERV];
Damien Miller57c4e872006-03-31 23:11:07 +11003364 int gaierr, sock = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003365
Damien Miller95def091999-11-25 00:26:21 +11003366 /* Try to open a socket for the local X server. */
3367 display = getenv("DISPLAY");
3368 if (!display) {
3369 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10003370 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003371 }
Damien Miller5428f641999-11-25 11:54:57 +11003372 /*
3373 * Now we decode the value of the DISPLAY variable and make a
3374 * connection to the real X server.
3375 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003376
Damien Miller819dbb62009-01-21 16:46:26 +11003377 /* Check if the display is from launchd. */
3378#ifdef __APPLE__
3379 if (strncmp(display, "/tmp/launch", 11) == 0) {
3380 sock = connect_local_xsocket_path(display);
3381 if (sock < 0)
3382 return -1;
3383
3384 /* OK, we now have a connection to the display. */
3385 return sock;
3386 }
3387#endif
Damien Miller5428f641999-11-25 11:54:57 +11003388 /*
3389 * Check if it is a unix domain socket. Unix domain displays are in
3390 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
3391 */
Damien Miller95def091999-11-25 00:26:21 +11003392 if (strncmp(display, "unix:", 5) == 0 ||
3393 display[0] == ':') {
3394 /* Connect to the unix domain socket. */
Damien Miller57c4e872006-03-31 23:11:07 +11003395 if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003396 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003397 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003398 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003399 }
3400 /* Create a socket. */
3401 sock = connect_local_xsocket(display_number);
3402 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10003403 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003404
3405 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10003406 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003407 }
Damien Miller5428f641999-11-25 11:54:57 +11003408 /*
3409 * Connect to an inet socket. The DISPLAY value is supposedly
3410 * hostname:d[.s], where hostname may also be numeric IP address.
3411 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00003412 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11003413 cp = strchr(buf, ':');
3414 if (!cp) {
3415 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10003416 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003417 }
Damien Miller95def091999-11-25 00:26:21 +11003418 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11003419 /* buf now contains the host name. But first we parse the display number. */
Damien Miller57c4e872006-03-31 23:11:07 +11003420 if (sscanf(cp + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003421 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003422 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003423 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003424 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003425
Damien Miller34132e52000-01-14 15:45:46 +11003426 /* Look up the host address */
3427 memset(&hints, 0, sizeof(hints));
3428 hints.ai_family = IPv4or6;
3429 hints.ai_socktype = SOCK_STREAM;
Damien Miller57c4e872006-03-31 23:11:07 +11003430 snprintf(strport, sizeof strport, "%u", 6000 + display_number);
Damien Miller34132e52000-01-14 15:45:46 +11003431 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003432 error("%.100s: unknown host. (%s)", buf,
3433 ssh_gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10003434 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003435 }
Damien Miller34132e52000-01-14 15:45:46 +11003436 for (ai = aitop; ai; ai = ai->ai_next) {
3437 /* Create a socket. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11003438 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003439 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003440 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10003441 continue;
3442 }
3443 /* Connect it to the display. */
3444 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Miller57c4e872006-03-31 23:11:07 +11003445 debug2("connect %.100s port %u: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10003446 6000 + display_number, strerror(errno));
3447 close(sock);
3448 continue;
3449 }
3450 /* Success */
3451 break;
Damien Miller34132e52000-01-14 15:45:46 +11003452 }
Damien Miller34132e52000-01-14 15:45:46 +11003453 freeaddrinfo(aitop);
3454 if (!ai) {
Damien Miller57c4e872006-03-31 23:11:07 +11003455 error("connect %.100s port %u: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11003456 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10003457 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003458 }
Damien Miller398e1cf2002-02-05 11:52:13 +11003459 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10003460 return sock;
3461}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003462
Damien Millerbd483e72000-04-30 10:00:53 +10003463/*
3464 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
3465 * the remote channel number. We should do whatever we want, and respond
3466 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
3467 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003468
Damien Miller8473dd82006-07-24 14:08:32 +10003469/* ARGSUSED */
Damien Millerbd483e72000-04-30 10:00:53 +10003470void
Damien Miller630d6f42002-01-22 23:17:30 +11003471x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10003472{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003473 Channel *c = NULL;
3474 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10003475 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10003476
3477 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003478
3479 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00003480
3481 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003482 remote_host = packet_get_string(NULL);
3483 } else {
3484 remote_host = xstrdup("unknown (remote did not supply name)");
3485 }
Damien Miller48b03fc2002-01-22 23:11:40 +11003486 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10003487
3488 /* Obtain a connection to the real X display. */
3489 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003490 if (sock != -1) {
3491 /* Allocate a channel for this connection. */
3492 c = channel_new("connected x11 socket",
3493 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3494 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11003495 c->remote_id = remote_id;
3496 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003497 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003498 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003499 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10003500 /* Send refusal to the remote host. */
3501 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003502 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10003503 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10003504 /* Send a confirmation to the remote host. */
3505 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003506 packet_put_int(remote_id);
3507 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10003508 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003509 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003510}
3511
Damien Miller69b69aa2000-10-28 14:19:58 +11003512/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
Damien Miller8473dd82006-07-24 14:08:32 +10003513/* ARGSUSED */
Damien Miller69b69aa2000-10-28 14:19:58 +11003514void
Damien Miller630d6f42002-01-22 23:17:30 +11003515deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11003516{
3517 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00003518
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00003519 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11003520 case SSH_SMSG_AGENT_OPEN:
3521 error("Warning: ssh server tried agent forwarding.");
3522 break;
3523 case SSH_SMSG_X11_OPEN:
3524 error("Warning: ssh server tried X11 forwarding.");
3525 break;
3526 default:
Damien Miller630d6f42002-01-22 23:17:30 +11003527 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11003528 break;
3529 }
Damien Miller5eb137c2005-12-31 16:19:53 +11003530 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11003531 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3532 packet_put_int(rchan);
3533 packet_send();
3534}
3535
Damien Miller5428f641999-11-25 11:54:57 +11003536/*
3537 * Requests forwarding of X11 connections, generates fake authentication
3538 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00003539 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11003540 */
Damien Miller4af51302000-04-16 11:18:38 +10003541void
Damien Miller17e7ed02005-06-17 12:54:33 +10003542x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Millerbd483e72000-04-30 10:00:53 +10003543 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003544{
Ben Lindstrom46c16222000-12-22 01:43:59 +00003545 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10003546 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11003547 char *new_data;
3548 int screen_number;
3549 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10003550 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003551
Damien Millerf92c0792005-07-06 09:45:26 +10003552 if (x11_saved_display == NULL)
3553 x11_saved_display = xstrdup(disp);
3554 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10003555 error("x11_request_forwarding_with_spoofing: different "
3556 "$DISPLAY already forwarded");
3557 return;
3558 }
3559
Damien Millerd5fe0ba2006-08-30 11:07:39 +10003560 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11003561 if (cp)
3562 cp = strchr(cp, '.');
3563 if (cp)
Damien Miller08d61502006-03-26 14:28:32 +11003564 screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
Damien Miller95def091999-11-25 00:26:21 +11003565 else
3566 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003567
Damien Miller13390022005-07-06 09:44:19 +10003568 if (x11_saved_proto == NULL) {
3569 /* Save protocol name. */
3570 x11_saved_proto = xstrdup(proto);
3571 /*
Damien Miller46d38de2005-07-17 17:02:09 +10003572 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10003573 * of the same length.
3574 */
3575 x11_saved_data = xmalloc(data_len);
3576 x11_fake_data = xmalloc(data_len);
3577 for (i = 0; i < data_len; i++) {
3578 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3579 fatal("x11_request_forwarding: bad "
3580 "authentication data: %.100s", data);
3581 if (i % 4 == 0)
3582 rnd = arc4random();
3583 x11_saved_data[i] = value;
3584 x11_fake_data[i] = rnd & 0xff;
3585 rnd >>= 8;
3586 }
3587 x11_saved_data_len = data_len;
3588 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003589 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003590
Damien Miller95def091999-11-25 00:26:21 +11003591 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003592 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003593
Damien Miller95def091999-11-25 00:26:21 +11003594 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003595 if (compat20) {
3596 channel_request_start(client_session_id, "x11-req", 0);
3597 packet_put_char(0); /* XXX bool single connection */
3598 } else {
3599 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3600 }
3601 packet_put_cstring(proto);
3602 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003603 packet_put_int(screen_number);
3604 packet_send();
3605 packet_write_wait();
3606 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003607}
3608
Ben Lindstrome9c99912001-06-09 00:41:05 +00003609
3610/* -- agent forwarding */
3611
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003612/* Sends a message to the server to request authentication fd forwarding. */
3613
Damien Miller4af51302000-04-16 11:18:38 +10003614void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003615auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003616{
Damien Miller95def091999-11-25 00:26:21 +11003617 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3618 packet_send();
3619 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003620}