blob: e5783b1974379bacd082f88c6e8cf9b3a3a813e9 [file] [log] [blame]
Damien Millerc6081482012-04-22 11:18:53 +10001/* $OpenBSD: channels.c,v 1.316 2012/03/29 23:54:36 dtucker Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * This file contains functions for generic socket connection forwarding.
7 * There is also code for initiating connection forwarding for X11 connections,
8 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10009 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
Damien Miller33b13562000-04-04 14:38:59 +100016 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110017 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 * Copyright (c) 1999 Dug Song. All rights reserved.
19 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110040 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110043
Damien Miller574c41f2006-03-15 11:40:10 +110044#include <sys/types.h>
Damien Millerd7834352006-08-05 12:39:39 +100045#include <sys/ioctl.h>
Damien Miller574c41f2006-03-15 11:40:10 +110046#include <sys/un.h>
Damien Millerefc04e72006-07-10 20:26:27 +100047#include <sys/socket.h>
Damien Miller9aec9192006-08-05 10:57:45 +100048#ifdef HAVE_SYS_TIME_H
49# include <sys/time.h>
50#endif
Damien Millerefc04e72006-07-10 20:26:27 +100051
52#include <netinet/in.h>
53#include <arpa/inet.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110054
Darren Tucker39972492006-07-12 22:22:46 +100055#include <errno.h>
Darren Tucker6e7fe1c2010-01-08 17:07:22 +110056#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100057#include <netdb.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100058#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100059#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100060#include <string.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110061#include <termios.h>
Damien Millere6b3b612006-07-24 14:01:23 +100062#include <unistd.h>
Damien Millerd7834352006-08-05 12:39:39 +100063#include <stdarg.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064
Damien Millerb84886b2008-05-19 15:05:07 +100065#include "openbsd-compat/sys-queue.h"
Damien Millerd7834352006-08-05 12:39:39 +100066#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100067#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000068#include "ssh1.h"
69#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100070#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000071#include "log.h"
72#include "misc.h"
Damien Millerd7834352006-08-05 12:39:39 +100073#include "buffer.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100074#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000076#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100077#include "key.h"
78#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110079#include "pathnames.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080
Ben Lindstrome9c99912001-06-09 00:41:05 +000081/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100082
Damien Miller5428f641999-11-25 11:54:57 +110083/*
84 * Pointer to an array containing all allocated channels. The array is
85 * dynamically extended as needed.
86 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000087static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100088
Damien Miller5428f641999-11-25 11:54:57 +110089/*
90 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000091 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110092 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100093static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094
Damien Miller5428f641999-11-25 11:54:57 +110095/*
96 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000097 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110098 */
Damien Miller5e953212001-01-30 09:14:00 +110099static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000100
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000101
Ben Lindstrome9c99912001-06-09 00:41:05 +0000102/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000103
Damien Miller5428f641999-11-25 11:54:57 +1100104/*
105 * Data structure for storing which hosts are permitted for forward requests.
106 * The local sides of any remote forwards are stored in this array to prevent
107 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
108 * network (which might be behind a firewall).
109 */
Damien Miller95def091999-11-25 00:26:21 +1100110typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +1000111 char *host_to_connect; /* Connect to 'host'. */
112 u_short port_to_connect; /* Connect to 'port'. */
113 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000114} ForwardPermission;
115
Damien Miller9b439df2006-07-24 14:04:00 +1000116/* List of all permitted host/port pairs to connect by the user. */
Damien Miller232cfb12010-06-26 09:50:30 +1000117static ForwardPermission *permitted_opens = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000118
Damien Miller9b439df2006-07-24 14:04:00 +1000119/* List of all permitted host/port pairs to connect by the admin. */
Damien Miller232cfb12010-06-26 09:50:30 +1000120static ForwardPermission *permitted_adm_opens = NULL;
Damien Miller9b439df2006-07-24 14:04:00 +1000121
122/* Number of permitted host/port pairs in the array permitted by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000123static int num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +1000124
125/* Number of permitted host/port pair in the array permitted by the admin. */
126static int num_adm_permitted_opens = 0;
127
Darren Tucker1338b9e2011-10-02 18:57:35 +1100128/* special-case port number meaning allow any port */
129#define FWD_PERMIT_ANY_PORT 0
130
Damien Miller5428f641999-11-25 11:54:57 +1100131/*
132 * If this is true, all opens are permitted. This is the case on the server
133 * on which we have to trust the client anyway, and the user could do
134 * anything after logging in anyway.
135 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000136static int all_opens_permitted = 0;
137
Ben Lindstrome9c99912001-06-09 00:41:05 +0000138
139/* -- X11 forwarding */
140
141/* Maximum number of fake X11 displays to try. */
142#define MAX_DISPLAYS 1000
143
Damien Miller13390022005-07-06 09:44:19 +1000144/* Saved X11 local (client) display. */
145static char *x11_saved_display = NULL;
146
Ben Lindstrome9c99912001-06-09 00:41:05 +0000147/* Saved X11 authentication protocol name. */
148static char *x11_saved_proto = NULL;
149
150/* Saved X11 authentication data. This is the real data. */
151static char *x11_saved_data = NULL;
152static u_int x11_saved_data_len = 0;
153
154/*
155 * Fake X11 authentication data. This is what the server will be sending us;
156 * we should replace any occurrences of this by the real data.
157 */
Damien Miller4ae97f12006-03-26 14:08:10 +1100158static u_char *x11_fake_data = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000159static u_int x11_fake_data_len;
160
161
162/* -- agent forwarding */
163
164#define NUM_SOCKS 10
165
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000166/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000167static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000168
Ben Lindstrome9c99912001-06-09 00:41:05 +0000169/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000170static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000171
Damien Millerbd740252008-05-19 15:37:09 +1000172/* non-blocking connect helpers */
173static int connect_next(struct channel_connect *);
174static void channel_connect_ctx_free(struct channel_connect *);
175
Ben Lindstrome9c99912001-06-09 00:41:05 +0000176/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000177
178Channel *
Damien Millerd47c62a2005-12-13 19:33:57 +1100179channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000180{
181 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000182
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000183 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100184 logit("channel_by_id: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000185 return NULL;
186 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000187 c = channels[id];
188 if (c == NULL) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100189 logit("channel_by_id: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000190 return NULL;
191 }
192 return c;
193}
194
Damien Miller5428f641999-11-25 11:54:57 +1100195/*
Damien Millerd47c62a2005-12-13 19:33:57 +1100196 * Returns the channel if it is allowed to receive protocol messages.
197 * Private channels, like listening sockets, may not receive messages.
198 */
199Channel *
200channel_lookup(int id)
201{
202 Channel *c;
203
204 if ((c = channel_by_id(id)) == NULL)
205 return (NULL);
206
Damien Millerd62f2ca2006-03-26 13:57:41 +1100207 switch (c->type) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100208 case SSH_CHANNEL_X11_OPEN:
209 case SSH_CHANNEL_LARVAL:
210 case SSH_CHANNEL_CONNECTING:
211 case SSH_CHANNEL_DYNAMIC:
212 case SSH_CHANNEL_OPENING:
213 case SSH_CHANNEL_OPEN:
214 case SSH_CHANNEL_INPUT_DRAINING:
215 case SSH_CHANNEL_OUTPUT_DRAINING:
216 return (c);
Damien Millerd47c62a2005-12-13 19:33:57 +1100217 }
218 logit("Non-public channel %d, type %d.", id, c->type);
219 return (NULL);
220}
221
222/*
Damien Millere247cc42000-05-07 12:03:14 +1000223 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000224 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100225 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000226static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100227channel_register_fds(Channel *c, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000228 int extusage, int nonblock, int is_tty)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000229{
Damien Miller95def091999-11-25 00:26:21 +1100230 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100231 channel_max_fd = MAX(channel_max_fd, rfd);
232 channel_max_fd = MAX(channel_max_fd, wfd);
233 channel_max_fd = MAX(channel_max_fd, efd);
234
Darren Tucker6e7fe1c2010-01-08 17:07:22 +1100235 if (rfd != -1)
236 fcntl(rfd, F_SETFD, FD_CLOEXEC);
237 if (wfd != -1 && wfd != rfd)
238 fcntl(wfd, F_SETFD, FD_CLOEXEC);
239 if (efd != -1 && efd != rfd && efd != wfd)
240 fcntl(efd, F_SETFD, FD_CLOEXEC);
Damien Millere247cc42000-05-07 12:03:14 +1000241
Damien Miller6f83b8e2000-05-02 09:23:45 +1000242 c->rfd = rfd;
243 c->wfd = wfd;
244 c->sock = (rfd == wfd) ? rfd : -1;
245 c->efd = efd;
246 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100247
Darren Tuckered3cdc02008-06-16 23:29:18 +1000248 if ((c->isatty = is_tty) != 0)
Damien Millerfbdeece2003-09-02 22:52:31 +1000249 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Darren Tucker1a48aec2008-06-16 23:35:56 +1000250 c->wfd_isatty = is_tty || isatty(c->wfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100251
Damien Miller69b69aa2000-10-28 14:19:58 +1100252 /* enable nonblocking mode */
253 if (nonblock) {
254 if (rfd != -1)
255 set_nonblock(rfd);
256 if (wfd != -1)
257 set_nonblock(wfd);
258 if (efd != -1)
259 set_nonblock(efd);
260 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000261}
262
263/*
264 * Allocate a new channel object and set its type and socket. This will cause
265 * remote_name to be freed.
266 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000267Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000268channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000269 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000270{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000271 int found;
272 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000273 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000274
Damien Miller95def091999-11-25 00:26:21 +1100275 /* Do initial allocation if this is the first call. */
276 if (channels_alloc == 0) {
277 channels_alloc = 10;
Damien Miller07d86be2006-03-26 14:19:21 +1100278 channels = xcalloc(channels_alloc, sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100279 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000280 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100281 }
282 /* Try to find a free slot where to put the new channel. */
283 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000284 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100285 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000286 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100287 break;
288 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000289 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100290 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100291 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000292 if (channels_alloc > 10000)
293 fatal("channel_new: internal error: channels_alloc %d "
294 "too big.", channels_alloc);
Damien Miller36812092006-03-26 14:22:47 +1100295 channels = xrealloc(channels, channels_alloc + 10,
296 sizeof(Channel *));
Damien Miller5efcecc2003-09-17 07:31:14 +1000297 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100298 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100299 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000300 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100301 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000302 /* Initialize and return new channel. */
Damien Miller07d86be2006-03-26 14:19:21 +1100303 c = channels[found] = xcalloc(1, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100304 buffer_init(&c->input);
305 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000306 buffer_init(&c->extended);
Damien Millera1c1b6c2009-01-28 16:29:49 +1100307 c->path = NULL;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000308 c->listening_addr = NULL;
309 c->listening_port = 0;
Damien Miller5144df92002-01-22 23:28:45 +1100310 c->ostate = CHAN_OUTPUT_OPEN;
311 c->istate = CHAN_INPUT_OPEN;
312 c->flags = 0;
Damien Millerd310d512008-06-16 07:59:23 +1000313 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0);
Damien Miller95def091999-11-25 00:26:21 +1100314 c->self = found;
315 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000316 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000317 c->local_window = window;
318 c->local_window_max = window;
319 c->local_consumed = 0;
320 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100321 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000322 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000323 c->remote_window = 0;
324 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000325 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100326 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000327 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100328 c->detach_close = 0;
Damien Millerb84886b2008-05-19 15:05:07 +1000329 c->open_confirm = NULL;
330 c->open_confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000331 c->input_filter = NULL;
Damien Miller077b2382005-12-31 16:22:32 +1100332 c->output_filter = NULL;
Darren Tucker84c56f52008-06-13 04:55:46 +1000333 c->filter_ctx = NULL;
334 c->filter_cleanup = NULL;
Damien Millere1537f92010-01-26 13:26:22 +1100335 c->ctl_chan = -1;
336 c->mux_rcb = NULL;
337 c->mux_ctx = NULL;
Damien Millerd530f5f2010-05-21 14:57:10 +1000338 c->mux_pause = 0;
Darren Tucker876045b2010-01-08 17:08:00 +1100339 c->delayed = 1; /* prevent call to channel_post handler */
Damien Millerb84886b2008-05-19 15:05:07 +1000340 TAILQ_INIT(&c->status_confirms);
Damien Miller95def091999-11-25 00:26:21 +1100341 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000342 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000343}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000344
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000345static int
346channel_find_maxfd(void)
347{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000348 u_int i;
349 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000350 Channel *c;
351
352 for (i = 0; i < channels_alloc; i++) {
353 c = channels[i];
354 if (c != NULL) {
355 max = MAX(max, c->rfd);
356 max = MAX(max, c->wfd);
357 max = MAX(max, c->efd);
358 }
359 }
360 return max;
361}
362
363int
364channel_close_fd(int *fdp)
365{
366 int ret = 0, fd = *fdp;
367
368 if (fd != -1) {
369 ret = close(fd);
370 *fdp = -1;
371 if (fd == channel_max_fd)
372 channel_max_fd = channel_find_maxfd();
373 }
374 return ret;
375}
376
Damien Miller6f83b8e2000-05-02 09:23:45 +1000377/* Close all channel fd/socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000378static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000379channel_close_fds(Channel *c)
380{
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000381 channel_close_fd(&c->sock);
382 channel_close_fd(&c->rfd);
383 channel_close_fd(&c->wfd);
384 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000385}
386
387/* Free the channel and close its fd/socket. */
Damien Miller4af51302000-04-16 11:18:38 +1000388void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000389channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000390{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000391 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000392 u_int i, n;
Damien Millerb84886b2008-05-19 15:05:07 +1000393 struct channel_confirm *cc;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000394
395 for (n = 0, i = 0; i < channels_alloc; i++)
396 if (channels[i])
397 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000398 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000399 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000400
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000401 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000402 debug3("channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000403 xfree(s);
404
Damien Miller6f83b8e2000-05-02 09:23:45 +1000405 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000406 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000407 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000408 buffer_free(&c->input);
409 buffer_free(&c->output);
410 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000411 if (c->remote_name) {
412 xfree(c->remote_name);
413 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100414 }
Damien Millera1c1b6c2009-01-28 16:29:49 +1100415 if (c->path) {
416 xfree(c->path);
417 c->path = NULL;
418 }
Damien Millerf6dff7c2011-09-22 21:38:52 +1000419 if (c->listening_addr) {
420 xfree(c->listening_addr);
421 c->listening_addr = NULL;
422 }
Damien Millerb84886b2008-05-19 15:05:07 +1000423 while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
424 if (cc->abandon_cb != NULL)
425 cc->abandon_cb(c, cc->ctx);
426 TAILQ_REMOVE(&c->status_confirms, cc, entry);
427 bzero(cc, sizeof(*cc));
428 xfree(cc);
429 }
Darren Tucker84c56f52008-06-13 04:55:46 +1000430 if (c->filter_cleanup != NULL && c->filter_ctx != NULL)
431 c->filter_cleanup(c->self, c->filter_ctx);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000432 channels[c->self] = NULL;
433 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000434}
435
Ben Lindstrome9c99912001-06-09 00:41:05 +0000436void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000437channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000438{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000439 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000440
Ben Lindstrom601e4362001-06-21 03:19:23 +0000441 for (i = 0; i < channels_alloc; i++)
442 if (channels[i] != NULL)
443 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000444}
445
446/*
447 * Closes the sockets/fds of all channels. This is used to close extra file
448 * descriptors after a fork.
449 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000450void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000451channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000452{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000453 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000454
455 for (i = 0; i < channels_alloc; i++)
456 if (channels[i] != NULL)
457 channel_close_fds(channels[i]);
458}
459
460/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000461 * Stop listening to channels.
462 */
Ben Lindstrom809744e2001-07-04 05:26:06 +0000463void
464channel_stop_listening(void)
465{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000466 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000467 Channel *c;
468
469 for (i = 0; i < channels_alloc; i++) {
470 c = channels[i];
471 if (c != NULL) {
472 switch (c->type) {
473 case SSH_CHANNEL_AUTH_SOCKET:
474 case SSH_CHANNEL_PORT_LISTENER:
475 case SSH_CHANNEL_RPORT_LISTENER:
476 case SSH_CHANNEL_X11_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000477 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000478 channel_free(c);
479 break;
480 }
481 }
482 }
483}
484
485/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000486 * Returns true if no channel has too much buffered data, and false if one or
487 * more channel is overfull.
488 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000489int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000490channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000491{
492 u_int i;
493 Channel *c;
494
495 for (i = 0; i < channels_alloc; i++) {
496 c = channels[i];
497 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000498#if 0
499 if (!compat20 &&
500 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100501 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000502 c->self, buffer_len(&c->input));
503 return 0;
504 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000505#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000506 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000507 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000508 c->self, buffer_len(&c->output),
509 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000510 return 0;
511 }
512 }
513 }
514 return 1;
515}
516
517/* Returns true if any channel is still open. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000518int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000519channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000520{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000521 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000522 Channel *c;
523
524 for (i = 0; i < channels_alloc; i++) {
525 c = channels[i];
526 if (c == NULL)
527 continue;
528 switch (c->type) {
529 case SSH_CHANNEL_X11_LISTENER:
530 case SSH_CHANNEL_PORT_LISTENER:
531 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100532 case SSH_CHANNEL_MUX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000533 case SSH_CHANNEL_CLOSED:
534 case SSH_CHANNEL_AUTH_SOCKET:
535 case SSH_CHANNEL_DYNAMIC:
536 case SSH_CHANNEL_CONNECTING:
537 case SSH_CHANNEL_ZOMBIE:
538 continue;
539 case SSH_CHANNEL_LARVAL:
540 if (!compat20)
541 fatal("cannot happen: SSH_CHANNEL_LARVAL");
542 continue;
543 case SSH_CHANNEL_OPENING:
544 case SSH_CHANNEL_OPEN:
545 case SSH_CHANNEL_X11_OPEN:
Damien Millere1537f92010-01-26 13:26:22 +1100546 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000547 return 1;
548 case SSH_CHANNEL_INPUT_DRAINING:
549 case SSH_CHANNEL_OUTPUT_DRAINING:
550 if (!compat13)
551 fatal("cannot happen: OUT_DRAIN");
552 return 1;
553 default:
554 fatal("channel_still_open: bad channel type %d", c->type);
555 /* NOTREACHED */
556 }
557 }
558 return 0;
559}
560
561/* Returns the id of an open channel suitable for keepaliving */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000562int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000563channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000564{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000565 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000566 Channel *c;
567
568 for (i = 0; i < channels_alloc; i++) {
569 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000570 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000571 continue;
572 switch (c->type) {
573 case SSH_CHANNEL_CLOSED:
574 case SSH_CHANNEL_DYNAMIC:
575 case SSH_CHANNEL_X11_LISTENER:
576 case SSH_CHANNEL_PORT_LISTENER:
577 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100578 case SSH_CHANNEL_MUX_LISTENER:
579 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000580 case SSH_CHANNEL_OPENING:
581 case SSH_CHANNEL_CONNECTING:
582 case SSH_CHANNEL_ZOMBIE:
583 continue;
584 case SSH_CHANNEL_LARVAL:
585 case SSH_CHANNEL_AUTH_SOCKET:
586 case SSH_CHANNEL_OPEN:
587 case SSH_CHANNEL_X11_OPEN:
588 return i;
589 case SSH_CHANNEL_INPUT_DRAINING:
590 case SSH_CHANNEL_OUTPUT_DRAINING:
591 if (!compat13)
592 fatal("cannot happen: OUT_DRAIN");
593 return i;
594 default:
595 fatal("channel_find_open: bad channel type %d", c->type);
596 /* NOTREACHED */
597 }
598 }
599 return -1;
600}
601
602
603/*
604 * Returns a message describing the currently open forwarded connections,
605 * suitable for sending to the client. The message contains crlf pairs for
606 * newlines.
607 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000608char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000609channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000610{
611 Buffer buffer;
612 Channel *c;
613 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000614 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000615
616 buffer_init(&buffer);
617 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
618 buffer_append(&buffer, buf, strlen(buf));
619 for (i = 0; i < channels_alloc; i++) {
620 c = channels[i];
621 if (c == NULL)
622 continue;
623 switch (c->type) {
624 case SSH_CHANNEL_X11_LISTENER:
625 case SSH_CHANNEL_PORT_LISTENER:
626 case SSH_CHANNEL_RPORT_LISTENER:
627 case SSH_CHANNEL_CLOSED:
628 case SSH_CHANNEL_AUTH_SOCKET:
629 case SSH_CHANNEL_ZOMBIE:
Damien Millere1537f92010-01-26 13:26:22 +1100630 case SSH_CHANNEL_MUX_CLIENT:
631 case SSH_CHANNEL_MUX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000632 continue;
633 case SSH_CHANNEL_LARVAL:
634 case SSH_CHANNEL_OPENING:
635 case SSH_CHANNEL_CONNECTING:
636 case SSH_CHANNEL_DYNAMIC:
637 case SSH_CHANNEL_OPEN:
638 case SSH_CHANNEL_X11_OPEN:
639 case SSH_CHANNEL_INPUT_DRAINING:
640 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000641 snprintf(buf, sizeof buf,
Damien Millere1537f92010-01-26 13:26:22 +1100642 " #%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 +0000643 c->self, c->remote_name,
644 c->type, c->remote_id,
645 c->istate, buffer_len(&c->input),
646 c->ostate, buffer_len(&c->output),
Damien Millere1537f92010-01-26 13:26:22 +1100647 c->rfd, c->wfd, c->ctl_chan);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000648 buffer_append(&buffer, buf, strlen(buf));
649 continue;
650 default:
651 fatal("channel_open_message: bad channel type %d", c->type);
652 /* NOTREACHED */
653 }
654 }
655 buffer_append(&buffer, "\0", 1);
656 cp = xstrdup(buffer_ptr(&buffer));
657 buffer_free(&buffer);
658 return cp;
659}
660
661void
662channel_send_open(int id)
663{
664 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000665
Ben Lindstrome9c99912001-06-09 00:41:05 +0000666 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000667 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000668 return;
669 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000670 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000671 packet_start(SSH2_MSG_CHANNEL_OPEN);
672 packet_put_cstring(c->ctype);
673 packet_put_int(c->self);
674 packet_put_int(c->local_window);
675 packet_put_int(c->local_maxpacket);
676 packet_send();
677}
678
679void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000680channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000681{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000682 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000683
Ben Lindstrome9c99912001-06-09 00:41:05 +0000684 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000685 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000686 return;
687 }
Damien Miller0e220db2004-06-15 10:34:08 +1000688 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000689 packet_start(SSH2_MSG_CHANNEL_REQUEST);
690 packet_put_int(c->remote_id);
691 packet_put_cstring(service);
692 packet_put_char(wantconfirm);
693}
Damien Miller4f7becb2006-03-26 14:10:14 +1100694
Ben Lindstrome9c99912001-06-09 00:41:05 +0000695void
Damien Millerb84886b2008-05-19 15:05:07 +1000696channel_register_status_confirm(int id, channel_confirm_cb *cb,
697 channel_confirm_abandon_cb *abandon_cb, void *ctx)
698{
699 struct channel_confirm *cc;
700 Channel *c;
701
702 if ((c = channel_lookup(id)) == NULL)
703 fatal("channel_register_expect: %d: bad id", id);
704
705 cc = xmalloc(sizeof(*cc));
706 cc->cb = cb;
707 cc->abandon_cb = abandon_cb;
708 cc->ctx = ctx;
709 TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry);
710}
711
712void
Damien Millerd530f5f2010-05-21 14:57:10 +1000713channel_register_open_confirm(int id, channel_open_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000714{
715 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000716
Ben Lindstrome9c99912001-06-09 00:41:05 +0000717 if (c == NULL) {
Damien Millera0094332008-11-03 19:26:35 +1100718 logit("channel_register_open_confirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000719 return;
720 }
Damien Millerb84886b2008-05-19 15:05:07 +1000721 c->open_confirm = fn;
722 c->open_confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000723}
Damien Miller4f7becb2006-03-26 14:10:14 +1100724
Ben Lindstrome9c99912001-06-09 00:41:05 +0000725void
Damien Miller39eda6e2005-11-05 14:52:50 +1100726channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000727{
Damien Millerd47c62a2005-12-13 19:33:57 +1100728 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000729
Ben Lindstrome9c99912001-06-09 00:41:05 +0000730 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000731 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000732 return;
733 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000734 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100735 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000736}
Damien Miller4f7becb2006-03-26 14:10:14 +1100737
Ben Lindstrome9c99912001-06-09 00:41:05 +0000738void
739channel_cancel_cleanup(int id)
740{
Damien Millerd47c62a2005-12-13 19:33:57 +1100741 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000742
Ben Lindstrome9c99912001-06-09 00:41:05 +0000743 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000744 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000745 return;
746 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000747 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100748 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000749}
Damien Miller4f7becb2006-03-26 14:10:14 +1100750
Ben Lindstrome9c99912001-06-09 00:41:05 +0000751void
Damien Miller077b2382005-12-31 16:22:32 +1100752channel_register_filter(int id, channel_infilter_fn *ifn,
Darren Tucker84c56f52008-06-13 04:55:46 +1000753 channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000754{
755 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000756
Ben Lindstrome9c99912001-06-09 00:41:05 +0000757 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000758 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000759 return;
760 }
Damien Miller077b2382005-12-31 16:22:32 +1100761 c->input_filter = ifn;
762 c->output_filter = ofn;
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000763 c->filter_ctx = ctx;
Darren Tucker84c56f52008-06-13 04:55:46 +1000764 c->filter_cleanup = cfn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000765}
766
767void
768channel_set_fds(int id, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000769 int extusage, int nonblock, int is_tty, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000770{
771 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000772
Ben Lindstrome9c99912001-06-09 00:41:05 +0000773 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
774 fatal("channel_activate for non-larval channel %d.", id);
Darren Tuckered3cdc02008-06-16 23:29:18 +1000775 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000776 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100777 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000778 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
779 packet_put_int(c->remote_id);
780 packet_put_int(c->local_window);
781 packet_send();
782}
783
Damien Miller5428f641999-11-25 11:54:57 +1100784/*
Damien Millerb38eff82000-04-01 11:09:21 +1000785 * 'channel_pre*' are called just before select() to add any bits relevant to
786 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100787 */
Damien Millerb38eff82000-04-01 11:09:21 +1000788/*
789 * 'channel_post*': perform any appropriate operations for channels which
790 * have events pending.
791 */
Damien Millerd62f2ca2006-03-26 13:57:41 +1100792typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000793chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
794chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
795
Damien Miller8473dd82006-07-24 14:08:32 +1000796/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000797static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100798channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000799{
800 FD_SET(c->sock, readset);
801}
802
Damien Miller8473dd82006-07-24 14:08:32 +1000803/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000804static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100805channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000806{
807 debug3("channel %d: waiting for connection", c->self);
808 FD_SET(c->sock, writeset);
809}
810
Ben Lindstrombba81212001-06-25 05:01:22 +0000811static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100812channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000813{
814 if (buffer_len(&c->input) < packet_get_maxsize())
815 FD_SET(c->sock, readset);
816 if (buffer_len(&c->output) > 0)
817 FD_SET(c->sock, writeset);
818}
819
Ben Lindstrombba81212001-06-25 05:01:22 +0000820static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100821channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000822{
Damien Millerde6987c2002-01-22 23:20:40 +1100823 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000824
Damien Miller33b13562000-04-04 14:38:59 +1000825 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100826 limit > 0 &&
Damien Miller499a0d52006-04-23 12:06:03 +1000827 buffer_len(&c->input) < limit &&
828 buffer_check_alloc(&c->input, CHAN_RBUF))
Damien Miller33b13562000-04-04 14:38:59 +1000829 FD_SET(c->rfd, readset);
830 if (c->ostate == CHAN_OUTPUT_OPEN ||
831 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
832 if (buffer_len(&c->output) > 0) {
833 FD_SET(c->wfd, writeset);
834 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000835 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000836 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
837 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000838 else
839 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000840 }
841 }
842 /** XXX check close conditions, too */
Damien Millerd654dd22008-05-19 16:05:41 +1000843 if (compat20 && c->efd != -1 &&
844 !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) {
Damien Miller33b13562000-04-04 14:38:59 +1000845 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
846 buffer_len(&c->extended) > 0)
847 FD_SET(c->efd, writeset);
Damien Miller8853ca52010-06-26 10:00:14 +1000848 else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT) &&
849 (c->extended_usage == CHAN_EXTENDED_READ ||
850 c->extended_usage == CHAN_EXTENDED_IGNORE) &&
Damien Miller33b13562000-04-04 14:38:59 +1000851 buffer_len(&c->extended) < c->remote_window)
852 FD_SET(c->efd, readset);
853 }
Damien Miller0e220db2004-06-15 10:34:08 +1000854 /* XXX: What about efd? races? */
Damien Miller33b13562000-04-04 14:38:59 +1000855}
856
Damien Miller8473dd82006-07-24 14:08:32 +1000857/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000858static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100859channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000860{
861 if (buffer_len(&c->input) == 0) {
862 packet_start(SSH_MSG_CHANNEL_CLOSE);
863 packet_put_int(c->remote_id);
864 packet_send();
865 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000866 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000867 }
868}
869
Damien Miller8473dd82006-07-24 14:08:32 +1000870/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000871static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100872channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000873{
874 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000875 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000876 else
Damien Millerb38eff82000-04-01 11:09:21 +1000877 FD_SET(c->sock, writeset);
878}
879
880/*
881 * This is a special state for X11 authentication spoofing. An opened X11
882 * connection (when authentication spoofing is being done) remains in this
883 * state until the first packet has been completely read. The authentication
884 * data in that packet is then substituted by the real data if it matches the
885 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000886 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000887 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000888 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000889static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000890x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000891{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000892 u_char *ucp;
893 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000894
895 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000896 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000897 return 0;
898
899 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100900 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000901 if (ucp[0] == 0x42) { /* Byte order MSB first. */
902 proto_len = 256 * ucp[6] + ucp[7];
903 data_len = 256 * ucp[8] + ucp[9];
904 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
905 proto_len = ucp[6] + 256 * ucp[7];
906 data_len = ucp[8] + 256 * ucp[9];
907 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000908 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100909 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000910 return -1;
911 }
912
913 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000914 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000915 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
916 return 0;
917
918 /* Check if authentication protocol matches. */
919 if (proto_len != strlen(x11_saved_proto) ||
920 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000921 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000922 return -1;
923 }
924 /* Check if authentication data matches our fake data. */
925 if (data_len != x11_fake_data_len ||
Damien Millerea1651c2010-07-16 13:58:37 +1000926 timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3),
Damien Millerb38eff82000-04-01 11:09:21 +1000927 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000928 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000929 return -1;
930 }
931 /* Check fake data length */
932 if (x11_fake_data_len != x11_saved_data_len) {
933 error("X11 fake_data_len %d != saved_data_len %d",
934 x11_fake_data_len, x11_saved_data_len);
935 return -1;
936 }
937 /*
938 * Received authentication protocol and data match
939 * our fake data. Substitute the fake data with real
940 * data.
941 */
942 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
943 x11_saved_data, x11_saved_data_len);
944 return 1;
945}
946
Ben Lindstrombba81212001-06-25 05:01:22 +0000947static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100948channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000949{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000950 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000951
Damien Millerb38eff82000-04-01 11:09:21 +1000952 if (ret == 1) {
953 /* Start normal processing for the channel. */
954 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000955 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000956 } else if (ret == -1) {
957 /*
958 * We have received an X11 connection that has bad
959 * authentication information.
960 */
Damien Miller996acd22003-04-09 20:59:48 +1000961 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000962 buffer_clear(&c->input);
963 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000964 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000965 c->sock = -1;
966 c->type = SSH_CHANNEL_CLOSED;
967 packet_start(SSH_MSG_CHANNEL_CLOSE);
968 packet_put_int(c->remote_id);
969 packet_send();
970 }
971}
972
Ben Lindstrombba81212001-06-25 05:01:22 +0000973static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100974channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000975{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000976 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000977
978 /* c->force_drain = 1; */
979
Damien Millerb38eff82000-04-01 11:09:21 +1000980 if (ret == 1) {
981 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +1100982 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000983 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000984 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +1000985 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +1100986 chan_read_failed(c);
987 buffer_clear(&c->input);
988 chan_ibuf_empty(c);
989 buffer_clear(&c->output);
990 /* for proto v1, the peer will send an IEOF */
991 if (compat20)
992 chan_write_failed(c);
993 else
994 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +1000995 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +1000996 }
997}
998
Damien Millere1537f92010-01-26 13:26:22 +1100999static void
1000channel_pre_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
1001{
Damien Millerd530f5f2010-05-21 14:57:10 +10001002 if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause &&
Damien Millere1537f92010-01-26 13:26:22 +11001003 buffer_check_alloc(&c->input, CHAN_RBUF))
1004 FD_SET(c->rfd, readset);
1005 if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1006 /* clear buffer immediately (discard any partial packet) */
1007 buffer_clear(&c->input);
1008 chan_ibuf_empty(c);
1009 /* Start output drain. XXX just kill chan? */
1010 chan_rcvd_oclose(c);
1011 }
1012 if (c->ostate == CHAN_OUTPUT_OPEN ||
1013 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1014 if (buffer_len(&c->output) > 0)
1015 FD_SET(c->wfd, writeset);
1016 else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN)
1017 chan_obuf_empty(c);
1018 }
1019}
1020
Ben Lindstromb3921512001-04-11 15:57:50 +00001021/* try to decode a socks4 header */
Damien Miller8473dd82006-07-24 14:08:32 +10001022/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001023static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001024channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001025{
Damien Millera10f5612002-09-12 09:49:15 +10001026 char *p, *host;
Damien Miller1781f532009-01-28 16:24:41 +11001027 u_int len, have, i, found, need;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001028 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001029 struct {
1030 u_int8_t version;
1031 u_int8_t command;
1032 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +00001033 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001034 } s4_req, s4_rsp;
1035
Ben Lindstromb3921512001-04-11 15:57:50 +00001036 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001037
1038 have = buffer_len(&c->input);
1039 len = sizeof(s4_req);
1040 if (have < len)
1041 return 0;
1042 p = buffer_ptr(&c->input);
Damien Miller1781f532009-01-28 16:24:41 +11001043
1044 need = 1;
1045 /* SOCKS4A uses an invalid IP address 0.0.0.x */
1046 if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) {
1047 debug2("channel %d: socks4a request", c->self);
1048 /* ... and needs an extra string (the hostname) */
1049 need = 2;
1050 }
1051 /* Check for terminating NUL on the string(s) */
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001052 for (found = 0, i = len; i < have; i++) {
1053 if (p[i] == '\0') {
Damien Miller1781f532009-01-28 16:24:41 +11001054 found++;
1055 if (found == need)
1056 break;
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001057 }
1058 if (i > 1024) {
1059 /* the peer is probably sending garbage */
1060 debug("channel %d: decode socks4: too long",
1061 c->self);
1062 return -1;
1063 }
1064 }
Damien Miller1781f532009-01-28 16:24:41 +11001065 if (found < need)
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001066 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001067 buffer_get(&c->input, (char *)&s4_req.version, 1);
1068 buffer_get(&c->input, (char *)&s4_req.command, 1);
1069 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +00001070 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001071 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001072 p = buffer_ptr(&c->input);
1073 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001074 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Damien Miller1781f532009-01-28 16:24:41 +11001075 len++; /* trailing '\0' */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001076 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +00001077 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001078 c->self, len, have);
1079 strlcpy(username, p, sizeof(username));
1080 buffer_consume(&c->input, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001081
Damien Millera1c1b6c2009-01-28 16:29:49 +11001082 if (c->path != NULL) {
1083 xfree(c->path);
1084 c->path = NULL;
1085 }
Damien Miller1781f532009-01-28 16:24:41 +11001086 if (need == 1) { /* SOCKS4: one string */
1087 host = inet_ntoa(s4_req.dest_addr);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001088 c->path = xstrdup(host);
Damien Miller1781f532009-01-28 16:24:41 +11001089 } else { /* SOCKS4A: two strings */
1090 have = buffer_len(&c->input);
1091 p = buffer_ptr(&c->input);
1092 len = strlen(p);
1093 debug2("channel %d: decode socks4a: host %s/%d",
1094 c->self, p, len);
1095 len++; /* trailing '\0' */
1096 if (len > have)
1097 fatal("channel %d: decode socks4a: len %d > have %d",
1098 c->self, len, have);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001099 if (len > NI_MAXHOST) {
Damien Miller1781f532009-01-28 16:24:41 +11001100 error("channel %d: hostname \"%.100s\" too long",
1101 c->self, p);
1102 return -1;
1103 }
Damien Millera1c1b6c2009-01-28 16:29:49 +11001104 c->path = xstrdup(p);
Damien Miller1781f532009-01-28 16:24:41 +11001105 buffer_consume(&c->input, len);
1106 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001107 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001108
Damien Millerfbdeece2003-09-02 22:52:31 +10001109 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Damien Miller1781f532009-01-28 16:24:41 +11001110 c->self, c->path, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001111
Ben Lindstromb3921512001-04-11 15:57:50 +00001112 if (s4_req.command != 1) {
Damien Miller1781f532009-01-28 16:24:41 +11001113 debug("channel %d: cannot handle: %s cn %d",
1114 c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command);
Ben Lindstromb3921512001-04-11 15:57:50 +00001115 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001116 }
Ben Lindstromb3921512001-04-11 15:57:50 +00001117 s4_rsp.version = 0; /* vn: 0 for reply */
1118 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001119 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +00001120 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Damien Millera0fdce92006-03-26 14:28:50 +11001121 buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +00001122 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001123}
1124
Darren Tucker46471c92003-07-03 13:55:19 +10001125/* try to decode a socks5 header */
1126#define SSH_SOCKS5_AUTHDONE 0x1000
1127#define SSH_SOCKS5_NOAUTH 0x00
1128#define SSH_SOCKS5_IPV4 0x01
1129#define SSH_SOCKS5_DOMAIN 0x03
1130#define SSH_SOCKS5_IPV6 0x04
1131#define SSH_SOCKS5_CONNECT 0x01
1132#define SSH_SOCKS5_SUCCESS 0x00
1133
Damien Miller8473dd82006-07-24 14:08:32 +10001134/* ARGSUSED */
Darren Tucker46471c92003-07-03 13:55:19 +10001135static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001136channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
Darren Tucker46471c92003-07-03 13:55:19 +10001137{
1138 struct {
1139 u_int8_t version;
1140 u_int8_t command;
1141 u_int8_t reserved;
1142 u_int8_t atyp;
1143 } s5_req, s5_rsp;
1144 u_int16_t dest_port;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001145 u_char *p, dest_addr[255+1], ntop[INET6_ADDRSTRLEN];
Damien Miller0f077072006-07-10 22:21:02 +10001146 u_int have, need, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001147
1148 debug2("channel %d: decode socks5", c->self);
1149 p = buffer_ptr(&c->input);
1150 if (p[0] != 0x05)
1151 return -1;
1152 have = buffer_len(&c->input);
1153 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1154 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001155 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001156 return 0;
1157 nmethods = p[1];
1158 if (have < nmethods + 2)
1159 return 0;
1160 /* look for method: "NO AUTHENTICATION REQUIRED" */
Damien Miller80163902007-01-05 16:30:16 +11001161 for (found = 0, i = 2; i < nmethods + 2; i++) {
Damien Miller4dec5d72006-08-05 11:38:40 +10001162 if (p[i] == SSH_SOCKS5_NOAUTH) {
Darren Tucker46471c92003-07-03 13:55:19 +10001163 found = 1;
1164 break;
1165 }
1166 }
1167 if (!found) {
1168 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1169 c->self);
1170 return -1;
1171 }
1172 buffer_consume(&c->input, nmethods + 2);
1173 buffer_put_char(&c->output, 0x05); /* version */
1174 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1175 FD_SET(c->sock, writeset);
1176 c->flags |= SSH_SOCKS5_AUTHDONE;
1177 debug2("channel %d: socks5 auth done", c->self);
1178 return 0; /* need more */
1179 }
1180 debug2("channel %d: socks5 post auth", c->self);
1181 if (have < sizeof(s5_req)+1)
1182 return 0; /* need more */
Damien Millere3b21a52006-03-26 14:29:06 +11001183 memcpy(&s5_req, p, sizeof(s5_req));
Darren Tucker46471c92003-07-03 13:55:19 +10001184 if (s5_req.version != 0x05 ||
1185 s5_req.command != SSH_SOCKS5_CONNECT ||
1186 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001187 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001188 return -1;
1189 }
Darren Tucker47eede72005-03-14 23:08:12 +11001190 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001191 case SSH_SOCKS5_IPV4:
1192 addrlen = 4;
1193 af = AF_INET;
1194 break;
1195 case SSH_SOCKS5_DOMAIN:
1196 addrlen = p[sizeof(s5_req)];
1197 af = -1;
1198 break;
1199 case SSH_SOCKS5_IPV6:
1200 addrlen = 16;
1201 af = AF_INET6;
1202 break;
1203 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001204 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001205 return -1;
1206 }
Damien Miller0f077072006-07-10 22:21:02 +10001207 need = sizeof(s5_req) + addrlen + 2;
1208 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1209 need++;
1210 if (have < need)
Darren Tucker46471c92003-07-03 13:55:19 +10001211 return 0;
1212 buffer_consume(&c->input, sizeof(s5_req));
1213 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1214 buffer_consume(&c->input, 1); /* host string length */
1215 buffer_get(&c->input, (char *)&dest_addr, addrlen);
1216 buffer_get(&c->input, (char *)&dest_port, 2);
1217 dest_addr[addrlen] = '\0';
Damien Millera1c1b6c2009-01-28 16:29:49 +11001218 if (c->path != NULL) {
1219 xfree(c->path);
1220 c->path = NULL;
1221 }
1222 if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
Damien Miller9576ac42009-01-28 16:30:33 +11001223 if (addrlen >= NI_MAXHOST) {
Damien Millera1c1b6c2009-01-28 16:29:49 +11001224 error("channel %d: dynamic request: socks5 hostname "
1225 "\"%.100s\" too long", c->self, dest_addr);
1226 return -1;
1227 }
1228 c->path = xstrdup(dest_addr);
1229 } else {
1230 if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL)
1231 return -1;
1232 c->path = xstrdup(ntop);
1233 }
Darren Tucker46471c92003-07-03 13:55:19 +10001234 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001235
Damien Millerfbdeece2003-09-02 22:52:31 +10001236 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001237 c->self, c->path, c->host_port, s5_req.command);
1238
1239 s5_rsp.version = 0x05;
1240 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1241 s5_rsp.reserved = 0; /* ignored */
1242 s5_rsp.atyp = SSH_SOCKS5_IPV4;
1243 ((struct in_addr *)&dest_addr)->s_addr = INADDR_ANY;
1244 dest_port = 0; /* ignored */
1245
Damien Millera0fdce92006-03-26 14:28:50 +11001246 buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp));
1247 buffer_append(&c->output, &dest_addr, sizeof(struct in_addr));
1248 buffer_append(&c->output, &dest_port, sizeof(dest_port));
Darren Tucker46471c92003-07-03 13:55:19 +10001249 return 1;
1250}
1251
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001252Channel *
Damien Millere1537f92010-01-26 13:26:22 +11001253channel_connect_stdio_fwd(const char *host_to_connect, u_short port_to_connect,
1254 int in, int out)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001255{
1256 Channel *c;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001257
1258 debug("channel_connect_stdio_fwd %s:%d", host_to_connect,
1259 port_to_connect);
1260
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001261 c = channel_new("stdio-forward", SSH_CHANNEL_OPENING, in, out,
1262 -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1263 0, "stdio-forward", /*nonblock*/0);
1264
1265 c->path = xstrdup(host_to_connect);
1266 c->host_port = port_to_connect;
1267 c->listening_port = 0;
1268 c->force_drain = 1;
1269
1270 channel_register_fds(c, in, out, -1, 0, 1, 0);
1271 port_open_helper(c, "direct-tcpip");
1272
1273 return c;
1274}
1275
Ben Lindstromb3921512001-04-11 15:57:50 +00001276/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001277static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001278channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstromb3921512001-04-11 15:57:50 +00001279{
1280 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001281 u_int have;
1282 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001283
1284 have = buffer_len(&c->input);
Ben Lindstromb3921512001-04-11 15:57:50 +00001285 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001286 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001287 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001288 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001289 /* need more */
1290 FD_SET(c->sock, readset);
1291 return;
1292 }
1293 /* try to guess the protocol */
1294 p = buffer_ptr(&c->input);
1295 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001296 case 0x04:
1297 ret = channel_decode_socks4(c, readset, writeset);
1298 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001299 case 0x05:
1300 ret = channel_decode_socks5(c, readset, writeset);
1301 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001302 default:
1303 ret = -1;
1304 break;
1305 }
1306 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001307 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001308 } else if (ret == 0) {
1309 debug2("channel %d: pre_dynamic: need more", c->self);
1310 /* need more */
1311 FD_SET(c->sock, readset);
1312 } else {
1313 /* switch to the next state */
1314 c->type = SSH_CHANNEL_OPENING;
1315 port_open_helper(c, "direct-tcpip");
1316 }
1317}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001318
Damien Millerb38eff82000-04-01 11:09:21 +10001319/* This is our fake X11 server socket. */
Damien Miller8473dd82006-07-24 14:08:32 +10001320/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001321static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001322channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001323{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001324 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001325 struct sockaddr_storage addr;
Damien Miller398e1cf2002-02-05 11:52:13 +11001326 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +10001327 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001328 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001329 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001330
1331 if (FD_ISSET(c->sock, readset)) {
1332 debug("X11 connection requested.");
1333 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001334 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001335 if (c->single_connection) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001336 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001337 channel_close_fd(&c->sock);
1338 chan_mark_dead(c);
1339 }
Damien Millerb38eff82000-04-01 11:09:21 +10001340 if (newsock < 0) {
1341 error("accept: %.100s", strerror(errno));
1342 return;
1343 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001344 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001345 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001346 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001347 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001348 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001349
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001350 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001351 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001352 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001353 if (compat20) {
1354 packet_start(SSH2_MSG_CHANNEL_OPEN);
1355 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001356 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001357 packet_put_int(nc->local_window_max);
1358 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001359 /* originator ipaddr and port */
1360 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001361 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001362 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001363 } else {
1364 packet_put_int(remote_port);
1365 }
Damien Millerbd483e72000-04-30 10:00:53 +10001366 packet_send();
1367 } else {
1368 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001369 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001370 if (packet_get_protocol_flags() &
1371 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001372 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001373 packet_send();
1374 }
Damien Millerd83ff352001-01-30 09:19:34 +11001375 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001376 }
1377}
1378
Ben Lindstrombba81212001-06-25 05:01:22 +00001379static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001380port_open_helper(Channel *c, char *rtype)
1381{
1382 int direct;
1383 char buf[1024];
1384 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001385 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001386
Damien Millerd6369432010-02-02 17:02:07 +11001387 if (remote_port == -1) {
1388 /* Fake addr/port to appease peers that validate it (Tectia) */
1389 xfree(remote_ipaddr);
1390 remote_ipaddr = xstrdup("127.0.0.1");
1391 remote_port = 65535;
1392 }
1393
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001394 direct = (strcmp(rtype, "direct-tcpip") == 0);
1395
1396 snprintf(buf, sizeof buf,
1397 "%s: listening port %d for %.100s port %d, "
1398 "connect from %.200s port %d",
1399 rtype, c->listening_port, c->path, c->host_port,
1400 remote_ipaddr, remote_port);
1401
1402 xfree(c->remote_name);
1403 c->remote_name = xstrdup(buf);
1404
1405 if (compat20) {
1406 packet_start(SSH2_MSG_CHANNEL_OPEN);
1407 packet_put_cstring(rtype);
1408 packet_put_int(c->self);
1409 packet_put_int(c->local_window_max);
1410 packet_put_int(c->local_maxpacket);
1411 if (direct) {
1412 /* target host, port */
1413 packet_put_cstring(c->path);
1414 packet_put_int(c->host_port);
1415 } else {
1416 /* listen address, port */
1417 packet_put_cstring(c->path);
1418 packet_put_int(c->listening_port);
1419 }
1420 /* originator host and port */
1421 packet_put_cstring(remote_ipaddr);
Damien Miller677257f2005-06-17 12:55:03 +10001422 packet_put_int((u_int)remote_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001423 packet_send();
1424 } else {
1425 packet_start(SSH_MSG_PORT_OPEN);
1426 packet_put_int(c->self);
1427 packet_put_cstring(c->path);
1428 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001429 if (packet_get_protocol_flags() &
1430 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001431 packet_put_cstring(c->remote_name);
1432 packet_send();
1433 }
1434 xfree(remote_ipaddr);
1435}
1436
Damien Miller5e7fd072005-11-05 14:53:39 +11001437static void
1438channel_set_reuseaddr(int fd)
1439{
1440 int on = 1;
1441
1442 /*
1443 * Set socket options.
1444 * Allow local port reuse in TIME_WAIT.
1445 */
1446 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1447 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1448}
1449
Damien Millerb38eff82000-04-01 11:09:21 +10001450/*
1451 * This socket is listening for connections to a forwarded TCP/IP port.
1452 */
Damien Miller8473dd82006-07-24 14:08:32 +10001453/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001454static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001455channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001456{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001457 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001458 struct sockaddr_storage addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001459 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001460 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001461 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001462
Damien Millerb38eff82000-04-01 11:09:21 +10001463 if (FD_ISSET(c->sock, readset)) {
1464 debug("Connection to port %d forwarding "
1465 "to %.100s port %d requested.",
1466 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001467
Damien Miller4623a752001-10-10 15:03:58 +10001468 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1469 nextstate = SSH_CHANNEL_OPENING;
1470 rtype = "forwarded-tcpip";
1471 } else {
1472 if (c->host_port == 0) {
1473 nextstate = SSH_CHANNEL_DYNAMIC;
Damien Millerd3c04b92001-10-10 15:04:20 +10001474 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001475 } else {
1476 nextstate = SSH_CHANNEL_OPENING;
1477 rtype = "direct-tcpip";
1478 }
1479 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001480
Damien Millerb38eff82000-04-01 11:09:21 +10001481 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001482 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001483 if (newsock < 0) {
1484 error("accept: %.100s", strerror(errno));
1485 return;
1486 }
Ben Lindstrom1ebd7a52002-02-26 18:12:51 +00001487 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001488 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1489 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001490 nc->listening_port = c->listening_port;
1491 nc->host_port = c->host_port;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001492 if (c->path != NULL)
1493 nc->path = xstrdup(c->path);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001494
Darren Tucker876045b2010-01-08 17:08:00 +11001495 if (nextstate != SSH_CHANNEL_DYNAMIC)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001496 port_open_helper(nc, rtype);
Damien Millerb38eff82000-04-01 11:09:21 +10001497 }
1498}
1499
1500/*
1501 * This is the authentication agent socket listening for connections from
1502 * clients.
1503 */
Damien Miller8473dd82006-07-24 14:08:32 +10001504/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001505static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001506channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001507{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001508 Channel *nc;
1509 int newsock;
Damien Miller163886f2008-07-14 11:28:58 +10001510 struct sockaddr_storage addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001511 socklen_t addrlen;
1512
1513 if (FD_ISSET(c->sock, readset)) {
1514 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001515 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001516 if (newsock < 0) {
1517 error("accept from auth socket: %.100s", strerror(errno));
1518 return;
1519 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001520 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001521 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1522 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001523 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001524 if (compat20) {
1525 packet_start(SSH2_MSG_CHANNEL_OPEN);
1526 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001527 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001528 packet_put_int(c->local_window_max);
1529 packet_put_int(c->local_maxpacket);
1530 } else {
1531 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001532 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001533 }
Damien Millerb38eff82000-04-01 11:09:21 +10001534 packet_send();
1535 }
1536}
1537
Damien Miller8473dd82006-07-24 14:08:32 +10001538/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001539static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001540channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001541{
Damien Millerbd740252008-05-19 15:37:09 +10001542 int err = 0, sock;
Ben Lindstrom11180952001-07-04 05:13:35 +00001543 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001544
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001545 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001546 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001547 err = errno;
1548 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001549 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001550 if (err == 0) {
Damien Millerbd740252008-05-19 15:37:09 +10001551 debug("channel %d: connected to %s port %d",
1552 c->self, c->connect_ctx.host, c->connect_ctx.port);
1553 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001554 c->type = SSH_CHANNEL_OPEN;
1555 if (compat20) {
1556 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1557 packet_put_int(c->remote_id);
1558 packet_put_int(c->self);
1559 packet_put_int(c->local_window);
1560 packet_put_int(c->local_maxpacket);
1561 } else {
1562 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1563 packet_put_int(c->remote_id);
1564 packet_put_int(c->self);
1565 }
1566 } else {
Damien Millerbd740252008-05-19 15:37:09 +10001567 debug("channel %d: connection failed: %s",
Ben Lindstrom69128662001-05-08 20:07:39 +00001568 c->self, strerror(err));
Damien Millerbd740252008-05-19 15:37:09 +10001569 /* Try next address, if any */
1570 if ((sock = connect_next(&c->connect_ctx)) > 0) {
1571 close(c->sock);
1572 c->sock = c->rfd = c->wfd = sock;
1573 channel_max_fd = channel_find_maxfd();
1574 return;
1575 }
1576 /* Exhausted all addresses */
1577 error("connect_to %.100s port %d: failed.",
1578 c->connect_ctx.host, c->connect_ctx.port);
1579 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001580 if (compat20) {
1581 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1582 packet_put_int(c->remote_id);
1583 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1584 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1585 packet_put_cstring(strerror(err));
1586 packet_put_cstring("");
1587 }
1588 } else {
1589 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1590 packet_put_int(c->remote_id);
1591 }
1592 chan_mark_dead(c);
1593 }
1594 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001595 }
1596}
1597
Damien Miller8473dd82006-07-24 14:08:32 +10001598/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001599static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001600channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001601{
Darren Tucker11327cc2005-03-14 23:22:25 +11001602 char buf[CHAN_RBUF];
Damien Miller835284b2007-06-11 13:03:16 +10001603 int len, force;
Damien Millerb38eff82000-04-01 11:09:21 +10001604
Damien Miller835284b2007-06-11 13:03:16 +10001605 force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED;
1606 if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001607 errno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001608 len = read(c->rfd, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +10001609 if (len < 0 && (errno == EINTR ||
1610 ((errno == EAGAIN || errno == EWOULDBLOCK) && !force)))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001611 return 1;
Darren Tucker9afe1152006-06-23 21:24:12 +10001612#ifndef PTY_ZEROREAD
Damien Millerb38eff82000-04-01 11:09:21 +10001613 if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001614#else
Darren Tucker144e8d62006-06-25 08:25:25 +10001615 if ((!c->isatty && len <= 0) ||
1616 (c->isatty && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001617#endif
Damien Millerfbdeece2003-09-02 22:52:31 +10001618 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001619 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001620 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001621 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001622 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001623 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001624 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001625 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001626 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001627 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001628 } else {
1629 chan_read_failed(c);
1630 }
1631 return -1;
1632 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001633 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001634 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001635 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001636 chan_read_failed(c);
1637 }
Damien Millerd27b9472005-12-13 19:29:02 +11001638 } else if (c->datagram) {
1639 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001640 } else {
1641 buffer_append(&c->input, buf, len);
1642 }
Damien Millerb38eff82000-04-01 11:09:21 +10001643 }
1644 return 1;
1645}
Damien Miller4f7becb2006-03-26 14:10:14 +11001646
Damien Miller8473dd82006-07-24 14:08:32 +10001647/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001648static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001649channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001650{
Ben Lindstrome229b252001-03-05 06:28:06 +00001651 struct termios tio;
Damien Miller077b2382005-12-31 16:22:32 +11001652 u_char *data = NULL, *buf;
Damien Miller7d457182010-08-05 23:09:48 +10001653 u_int dlen, olen = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001654 int len;
1655
1656 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001657 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001658 FD_ISSET(c->wfd, writeset) &&
1659 buffer_len(&c->output) > 0) {
Damien Miller7d457182010-08-05 23:09:48 +10001660 olen = buffer_len(&c->output);
Damien Miller077b2382005-12-31 16:22:32 +11001661 if (c->output_filter != NULL) {
1662 if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1663 debug2("channel %d: filter stops", c->self);
Damien Millere204f6a2006-01-31 21:47:15 +11001664 if (c->type != SSH_CHANNEL_OPEN)
1665 chan_mark_dead(c);
1666 else
1667 chan_write_failed(c);
1668 return -1;
Damien Miller077b2382005-12-31 16:22:32 +11001669 }
1670 } else if (c->datagram) {
1671 buf = data = buffer_get_string(&c->output, &dlen);
1672 } else {
1673 buf = data = buffer_ptr(&c->output);
1674 dlen = buffer_len(&c->output);
1675 }
1676
Damien Millerd27b9472005-12-13 19:29:02 +11001677 if (c->datagram) {
Damien Millerd27b9472005-12-13 19:29:02 +11001678 /* ignore truncated writes, datagrams might get lost */
Damien Miller077b2382005-12-31 16:22:32 +11001679 len = write(c->wfd, buf, dlen);
Damien Millerd27b9472005-12-13 19:29:02 +11001680 xfree(data);
Damien Millerd8968ad2008-07-04 23:10:49 +10001681 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1682 errno == EWOULDBLOCK))
Damien Millerd27b9472005-12-13 19:29:02 +11001683 return 1;
1684 if (len <= 0) {
1685 if (c->type != SSH_CHANNEL_OPEN)
1686 chan_mark_dead(c);
1687 else
1688 chan_write_failed(c);
1689 return -1;
1690 }
Damien Miller7d457182010-08-05 23:09:48 +10001691 goto out;
Damien Millerd27b9472005-12-13 19:29:02 +11001692 }
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001693#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001694 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001695 if (compat20 && c->wfd_isatty)
1696 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001697#endif
Damien Miller077b2382005-12-31 16:22:32 +11001698
1699 len = write(c->wfd, buf, dlen);
Damien Millerd8968ad2008-07-04 23:10:49 +10001700 if (len < 0 &&
1701 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001702 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001703 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001704 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001705 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001706 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001707 return -1;
1708 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001709 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001710 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001711 c->type = SSH_CHANNEL_INPUT_DRAINING;
1712 } else {
1713 chan_write_failed(c);
1714 }
1715 return -1;
1716 }
Darren Tucker3980b632009-08-28 11:02:37 +10001717#ifndef BROKEN_TCGETATTR_ICANON
Damien Miller077b2382005-12-31 16:22:32 +11001718 if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001719 if (tcgetattr(c->wfd, &tio) == 0 &&
1720 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1721 /*
1722 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001723 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001724 * size of a SSH2_MSG_CHANNEL_DATA message
Damien Miller077b2382005-12-31 16:22:32 +11001725 * (4 byte channel id + buf)
Damien Miller79438cc2001-02-16 12:34:57 +11001726 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001727 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001728 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001729 }
1730 }
Darren Tucker3980b632009-08-28 11:02:37 +10001731#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001732 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001733 }
Damien Miller7d457182010-08-05 23:09:48 +10001734 out:
1735 if (compat20 && olen > 0)
1736 c->local_consumed += olen - buffer_len(&c->output);
Damien Miller33b13562000-04-04 14:38:59 +10001737 return 1;
1738}
Damien Miller4f7becb2006-03-26 14:10:14 +11001739
Ben Lindstrombba81212001-06-25 05:01:22 +00001740static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001741channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller33b13562000-04-04 14:38:59 +10001742{
Darren Tucker11327cc2005-03-14 23:22:25 +11001743 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001744 int len;
1745
Damien Miller1383bd82000-04-06 12:32:37 +10001746/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001747 if (c->efd != -1) {
1748 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1749 FD_ISSET(c->efd, writeset) &&
1750 buffer_len(&c->extended) > 0) {
1751 len = write(c->efd, buffer_ptr(&c->extended),
1752 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001753 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001754 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001755 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1756 errno == EWOULDBLOCK))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001757 return 1;
1758 if (len <= 0) {
1759 debug2("channel %d: closing write-efd %d",
1760 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001761 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001762 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001763 buffer_consume(&c->extended, len);
1764 c->local_consumed += len;
1765 }
Damien Miller8853ca52010-06-26 10:00:14 +10001766 } else if (c->efd != -1 &&
1767 (c->extended_usage == CHAN_EXTENDED_READ ||
1768 c->extended_usage == CHAN_EXTENDED_IGNORE) &&
Damien Millere42bd242007-01-29 10:16:28 +11001769 (c->detach_close || FD_ISSET(c->efd, readset))) {
Damien Miller33b13562000-04-04 14:38:59 +10001770 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001771 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001772 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001773 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
1774 errno == EWOULDBLOCK) && !c->detach_close)))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001775 return 1;
1776 if (len <= 0) {
1777 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001778 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001779 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001780 } else {
Damien Miller8853ca52010-06-26 10:00:14 +10001781 if (c->extended_usage == CHAN_EXTENDED_IGNORE) {
1782 debug3("channel %d: discard efd",
1783 c->self);
1784 } else
1785 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001786 }
Damien Miller33b13562000-04-04 14:38:59 +10001787 }
1788 }
1789 return 1;
1790}
Damien Miller4f7becb2006-03-26 14:10:14 +11001791
Damien Miller0e220db2004-06-15 10:34:08 +10001792static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001793channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001794{
Ben Lindstromb3921512001-04-11 15:57:50 +00001795 if (c->type == SSH_CHANNEL_OPEN &&
1796 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Darren Tuckerae09cb82007-06-25 19:04:46 +10001797 ((c->local_window_max - c->local_window >
Damien Miller3191a8e2007-06-11 18:33:15 +10001798 c->local_maxpacket*3) ||
1799 c->local_window < c->local_window_max/2) &&
Damien Miller33b13562000-04-04 14:38:59 +10001800 c->local_consumed > 0) {
1801 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1802 packet_put_int(c->remote_id);
1803 packet_put_int(c->local_consumed);
1804 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001805 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001806 c->self, c->local_window,
1807 c->local_consumed);
1808 c->local_window += c->local_consumed;
1809 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001810 }
1811 return 1;
1812}
1813
Ben Lindstrombba81212001-06-25 05:01:22 +00001814static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001815channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001816{
1817 channel_handle_rfd(c, readset, writeset);
1818 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001819 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001820 return;
Damien Miller33b13562000-04-04 14:38:59 +10001821 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001822 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001823}
1824
Damien Millere1537f92010-01-26 13:26:22 +11001825static u_int
1826read_mux(Channel *c, u_int need)
1827{
1828 char buf[CHAN_RBUF];
1829 int len;
1830 u_int rlen;
1831
1832 if (buffer_len(&c->input) < need) {
1833 rlen = need - buffer_len(&c->input);
1834 len = read(c->rfd, buf, MIN(rlen, CHAN_RBUF));
1835 if (len <= 0) {
1836 if (errno != EINTR && errno != EAGAIN) {
1837 debug2("channel %d: ctl read<=0 rfd %d len %d",
1838 c->self, c->rfd, len);
1839 chan_read_failed(c);
1840 return 0;
1841 }
1842 } else
1843 buffer_append(&c->input, buf, len);
1844 }
1845 return buffer_len(&c->input);
1846}
1847
1848static void
1849channel_post_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
1850{
1851 u_int need;
1852 ssize_t len;
1853
1854 if (!compat20)
1855 fatal("%s: entered with !compat20", __func__);
1856
Damien Millerd530f5f2010-05-21 14:57:10 +10001857 if (c->rfd != -1 && !c->mux_pause && FD_ISSET(c->rfd, readset) &&
Damien Millere1537f92010-01-26 13:26:22 +11001858 (c->istate == CHAN_INPUT_OPEN ||
1859 c->istate == CHAN_INPUT_WAIT_DRAIN)) {
1860 /*
1861 * Don't not read past the precise end of packets to
1862 * avoid disrupting fd passing.
1863 */
1864 if (read_mux(c, 4) < 4) /* read header */
1865 return;
1866 need = get_u32(buffer_ptr(&c->input));
1867#define CHANNEL_MUX_MAX_PACKET (256 * 1024)
1868 if (need > CHANNEL_MUX_MAX_PACKET) {
1869 debug2("channel %d: packet too big %u > %u",
1870 c->self, CHANNEL_MUX_MAX_PACKET, need);
1871 chan_rcvd_oclose(c);
1872 return;
1873 }
1874 if (read_mux(c, need + 4) < need + 4) /* read body */
1875 return;
1876 if (c->mux_rcb(c) != 0) {
1877 debug("channel %d: mux_rcb failed", c->self);
1878 chan_mark_dead(c);
1879 return;
1880 }
1881 }
1882
1883 if (c->wfd != -1 && FD_ISSET(c->wfd, writeset) &&
1884 buffer_len(&c->output) > 0) {
1885 len = write(c->wfd, buffer_ptr(&c->output),
1886 buffer_len(&c->output));
1887 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1888 return;
1889 if (len <= 0) {
1890 chan_mark_dead(c);
1891 return;
1892 }
1893 buffer_consume(&c->output, len);
1894 }
1895}
1896
1897static void
1898channel_post_mux_listener(Channel *c, fd_set *readset, fd_set *writeset)
1899{
1900 Channel *nc;
1901 struct sockaddr_storage addr;
1902 socklen_t addrlen;
1903 int newsock;
1904 uid_t euid;
1905 gid_t egid;
1906
1907 if (!FD_ISSET(c->sock, readset))
1908 return;
1909
1910 debug("multiplexing control connection");
1911
1912 /*
1913 * Accept connection on control socket
1914 */
1915 memset(&addr, 0, sizeof(addr));
1916 addrlen = sizeof(addr);
1917 if ((newsock = accept(c->sock, (struct sockaddr*)&addr,
1918 &addrlen)) == -1) {
1919 error("%s accept: %s", __func__, strerror(errno));
1920 return;
1921 }
1922
1923 if (getpeereid(newsock, &euid, &egid) < 0) {
1924 error("%s getpeereid failed: %s", __func__,
1925 strerror(errno));
1926 close(newsock);
1927 return;
1928 }
1929 if ((euid != 0) && (getuid() != euid)) {
1930 error("multiplex uid mismatch: peer euid %u != uid %u",
1931 (u_int)euid, (u_int)getuid());
1932 close(newsock);
1933 return;
1934 }
1935 nc = channel_new("multiplex client", SSH_CHANNEL_MUX_CLIENT,
1936 newsock, newsock, -1, c->local_window_max,
1937 c->local_maxpacket, 0, "mux-control", 1);
1938 nc->mux_rcb = c->mux_rcb;
1939 debug3("%s: new mux channel %d fd %d", __func__,
1940 nc->self, nc->sock);
1941 /* establish state */
1942 nc->mux_rcb(nc);
1943 /* mux state transitions must not elicit protocol messages */
1944 nc->flags |= CHAN_LOCAL;
1945}
1946
Damien Miller8473dd82006-07-24 14:08:32 +10001947/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001948static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001949channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001950{
1951 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00001952
Damien Millerb38eff82000-04-01 11:09:21 +10001953 /* Send buffered output data to the socket. */
1954 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1955 len = write(c->sock, buffer_ptr(&c->output),
1956 buffer_len(&c->output));
1957 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11001958 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001959 else
1960 buffer_consume(&c->output, len);
1961 }
1962}
1963
Ben Lindstrombba81212001-06-25 05:01:22 +00001964static void
Damien Miller33b13562000-04-04 14:38:59 +10001965channel_handler_init_20(void)
1966{
Damien Millerde6987c2002-01-22 23:20:40 +11001967 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10001968 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001969 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001970 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001971 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001972 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001973 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001974 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millere1537f92010-01-26 13:26:22 +11001975 channel_pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener;
1976 channel_pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10001977
Damien Millerde6987c2002-01-22 23:20:40 +11001978 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10001979 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001980 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001981 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001982 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001983 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11001984 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millere1537f92010-01-26 13:26:22 +11001985 channel_post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener;
1986 channel_post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10001987}
1988
Ben Lindstrombba81212001-06-25 05:01:22 +00001989static void
Damien Millerb38eff82000-04-01 11:09:21 +10001990channel_handler_init_13(void)
1991{
1992 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1993 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1994 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1995 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1996 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1997 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1998 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001999 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002000 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10002001
Damien Millerde6987c2002-01-22 23:20:40 +11002002 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002003 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2004 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2005 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
2006 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002007 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002008 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002009}
2010
Ben Lindstrombba81212001-06-25 05:01:22 +00002011static void
Damien Millerb38eff82000-04-01 11:09:21 +10002012channel_handler_init_15(void)
2013{
Damien Millerde6987c2002-01-22 23:20:40 +11002014 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10002015 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002016 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2017 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2018 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002019 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002020 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10002021
2022 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2023 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2024 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11002025 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002026 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002027 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002028}
2029
Ben Lindstrombba81212001-06-25 05:01:22 +00002030static void
Damien Millerb38eff82000-04-01 11:09:21 +10002031channel_handler_init(void)
2032{
2033 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002034
Damien Miller9f0f5c62001-12-21 14:45:46 +11002035 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10002036 channel_pre[i] = NULL;
2037 channel_post[i] = NULL;
2038 }
Damien Miller33b13562000-04-04 14:38:59 +10002039 if (compat20)
2040 channel_handler_init_20();
2041 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002042 channel_handler_init_13();
2043 else
2044 channel_handler_init_15();
2045}
2046
Damien Miller3ec27592001-10-12 11:35:04 +10002047/* gc dead channels */
2048static void
2049channel_garbage_collect(Channel *c)
2050{
2051 if (c == NULL)
2052 return;
2053 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11002054 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10002055 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002056 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002057 c->detach_user(c->self, NULL);
2058 /* if we still have a callback */
2059 if (c->detach_user != NULL)
2060 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002061 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002062 }
2063 if (!chan_is_dead(c, 1))
2064 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002065 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002066 channel_free(c);
2067}
2068
Ben Lindstrombba81212001-06-25 05:01:22 +00002069static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11002070channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10002071{
2072 static int did_init = 0;
Darren Tucker876045b2010-01-08 17:08:00 +11002073 u_int i, oalloc;
Damien Millerb38eff82000-04-01 11:09:21 +10002074 Channel *c;
2075
2076 if (!did_init) {
2077 channel_handler_init();
2078 did_init = 1;
2079 }
Darren Tucker876045b2010-01-08 17:08:00 +11002080 for (i = 0, oalloc = channels_alloc; i < oalloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002081 c = channels[i];
2082 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10002083 continue;
Darren Tucker876045b2010-01-08 17:08:00 +11002084 if (c->delayed) {
2085 if (ftab == channel_pre)
2086 c->delayed = 0;
2087 else
2088 continue;
2089 }
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00002090 if (ftab[c->type] != NULL)
2091 (*ftab[c->type])(c, readset, writeset);
Damien Miller3ec27592001-10-12 11:35:04 +10002092 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002093 }
2094}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002095
Ben Lindstrome9c99912001-06-09 00:41:05 +00002096/*
2097 * Allocate/update select bitmasks and add any bits relevant to channels in
2098 * select bitmasks.
2099 */
Damien Miller4af51302000-04-16 11:18:38 +10002100void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002101channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002102 u_int *nallocp, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002103{
Damien Miller36812092006-03-26 14:22:47 +11002104 u_int n, sz, nfdset;
Damien Miller5e953212001-01-30 09:14:00 +11002105
2106 n = MAX(*maxfdp, channel_max_fd);
2107
Damien Miller36812092006-03-26 14:22:47 +11002108 nfdset = howmany(n+1, NFDBITS);
2109 /* Explicitly test here, because xrealloc isn't always called */
2110 if (nfdset && SIZE_T_MAX / nfdset < sizeof(fd_mask))
2111 fatal("channel_prepare_select: max_fd (%d) is too large", n);
2112 sz = nfdset * sizeof(fd_mask);
2113
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002114 /* perhaps check sz < nalloc/2 and shrink? */
2115 if (*readsetp == NULL || sz > *nallocp) {
Damien Miller36812092006-03-26 14:22:47 +11002116 *readsetp = xrealloc(*readsetp, nfdset, sizeof(fd_mask));
2117 *writesetp = xrealloc(*writesetp, nfdset, sizeof(fd_mask));
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002118 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11002119 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002120 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11002121 memset(*readsetp, 0, sz);
2122 memset(*writesetp, 0, sz);
2123
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002124 if (!rekeying)
2125 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002126}
2127
Ben Lindstrome9c99912001-06-09 00:41:05 +00002128/*
2129 * After select, perform any appropriate operations for channels which have
2130 * events pending.
2131 */
Damien Miller4af51302000-04-16 11:18:38 +10002132void
Damien Millerd62f2ca2006-03-26 13:57:41 +11002133channel_after_select(fd_set *readset, fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002134{
Damien Millerb38eff82000-04-01 11:09:21 +10002135 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002136}
2137
Ben Lindstrome9c99912001-06-09 00:41:05 +00002138
Damien Miller5e953212001-01-30 09:14:00 +11002139/* If there is data to send to the connection, enqueue some of it now. */
Damien Miller4af51302000-04-16 11:18:38 +10002140void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002141channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002142{
Damien Millerb38eff82000-04-01 11:09:21 +10002143 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002144 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002145
Damien Miller95def091999-11-25 00:26:21 +11002146 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002147 c = channels[i];
2148 if (c == NULL)
2149 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002150
Ben Lindstrome9c99912001-06-09 00:41:05 +00002151 /*
2152 * We are only interested in channels that can have buffered
2153 * incoming data.
2154 */
Damien Miller34132e52000-01-14 15:45:46 +11002155 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10002156 if (c->type != SSH_CHANNEL_OPEN &&
2157 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11002158 continue;
2159 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10002160 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002161 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002162 }
Damien Millerefb4afe2000-04-12 18:45:05 +10002163 if (compat20 &&
2164 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002165 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10002166 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002167 continue;
2168 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002169
Damien Miller95def091999-11-25 00:26:21 +11002170 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002171 if ((c->istate == CHAN_INPUT_OPEN ||
2172 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
2173 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11002174 if (c->datagram) {
2175 if (len > 0) {
2176 u_char *data;
2177 u_int dlen;
2178
2179 data = buffer_get_string(&c->input,
2180 &dlen);
Damien Miller7d457182010-08-05 23:09:48 +10002181 if (dlen > c->remote_window ||
2182 dlen > c->remote_maxpacket) {
2183 debug("channel %d: datagram "
2184 "too big for channel",
2185 c->self);
2186 xfree(data);
2187 continue;
2188 }
Damien Millerd27b9472005-12-13 19:29:02 +11002189 packet_start(SSH2_MSG_CHANNEL_DATA);
2190 packet_put_int(c->remote_id);
2191 packet_put_string(data, dlen);
2192 packet_send();
2193 c->remote_window -= dlen + 4;
2194 xfree(data);
2195 }
2196 continue;
2197 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002198 /*
2199 * Send some data for the other side over the secure
2200 * connection.
2201 */
Damien Miller33b13562000-04-04 14:38:59 +10002202 if (compat20) {
2203 if (len > c->remote_window)
2204 len = c->remote_window;
2205 if (len > c->remote_maxpacket)
2206 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11002207 } else {
Damien Miller33b13562000-04-04 14:38:59 +10002208 if (packet_is_interactive()) {
2209 if (len > 1024)
2210 len = 512;
2211 } else {
2212 /* Keep the packets at reasonable size. */
2213 if (len > packet_get_maxsize()/2)
2214 len = packet_get_maxsize()/2;
2215 }
Damien Miller95def091999-11-25 00:26:21 +11002216 }
Damien Millerb38eff82000-04-01 11:09:21 +10002217 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10002218 packet_start(compat20 ?
2219 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10002220 packet_put_int(c->remote_id);
2221 packet_put_string(buffer_ptr(&c->input), len);
2222 packet_send();
2223 buffer_consume(&c->input, len);
2224 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10002225 }
2226 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11002227 if (compat13)
2228 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11002229 /*
2230 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00002231 * tell peer, that we will not send more data: send IEOF.
2232 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11002233 */
Ben Lindstromcf159442002-03-26 03:26:24 +00002234 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10002235 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
2236 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00002237 else
2238 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11002239 }
Damien Miller33b13562000-04-04 14:38:59 +10002240 /* Send extended data, i.e. stderr */
2241 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00002242 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10002243 c->remote_window > 0 &&
2244 (len = buffer_len(&c->extended)) > 0 &&
2245 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002246 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002247 c->self, c->remote_window, buffer_len(&c->extended),
2248 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10002249 if (len > c->remote_window)
2250 len = c->remote_window;
2251 if (len > c->remote_maxpacket)
2252 len = c->remote_maxpacket;
2253 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
2254 packet_put_int(c->remote_id);
2255 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
2256 packet_put_string(buffer_ptr(&c->extended), len);
2257 packet_send();
2258 buffer_consume(&c->extended, len);
2259 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002260 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10002261 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002262 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002263}
2264
Ben Lindstrome9c99912001-06-09 00:41:05 +00002265
2266/* -- protocol input */
Damien Millerd79b4242006-03-31 23:11:44 +11002267
2268/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002269void
Damien Miller630d6f42002-01-22 23:17:30 +11002270channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002271{
Damien Miller34132e52000-01-14 15:45:46 +11002272 int id;
Damien Miller95def091999-11-25 00:26:21 +11002273 char *data;
Damien Miller7d457182010-08-05 23:09:48 +10002274 u_int data_len, win_len;
Damien Millerb38eff82000-04-01 11:09:21 +10002275 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002276
Damien Miller95def091999-11-25 00:26:21 +11002277 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11002278 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10002279 c = channel_lookup(id);
2280 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11002281 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002282
Damien Miller95def091999-11-25 00:26:21 +11002283 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10002284 if (c->type != SSH_CHANNEL_OPEN &&
2285 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002286 return;
2287
Damien Miller95def091999-11-25 00:26:21 +11002288 /* Get the data. */
Damien Millerdb255ca2008-05-19 14:59:37 +10002289 data = packet_get_string_ptr(&data_len);
Damien Miller7d457182010-08-05 23:09:48 +10002290 win_len = data_len;
2291 if (c->datagram)
2292 win_len += 4; /* string length header */
Damien Millerb38eff82000-04-01 11:09:21 +10002293
Damien Millera04ad492004-01-21 11:02:09 +11002294 /*
2295 * Ignore data for protocol > 1.3 if output end is no longer open.
2296 * For protocol 2 the sending side is reducing its window as it sends
2297 * data, so we must 'fake' consumption of the data in order to ensure
2298 * that window updates are sent back. Otherwise the connection might
2299 * deadlock.
2300 */
2301 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
2302 if (compat20) {
Damien Miller7d457182010-08-05 23:09:48 +10002303 c->local_window -= win_len;
2304 c->local_consumed += win_len;
Damien Millera04ad492004-01-21 11:02:09 +11002305 }
Damien Millera04ad492004-01-21 11:02:09 +11002306 return;
2307 }
2308
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002309 if (compat20) {
Damien Miller7d457182010-08-05 23:09:48 +10002310 if (win_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10002311 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller7d457182010-08-05 23:09:48 +10002312 c->self, win_len, c->local_maxpacket);
Damien Miller33b13562000-04-04 14:38:59 +10002313 }
Damien Miller7d457182010-08-05 23:09:48 +10002314 if (win_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002315 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller7d457182010-08-05 23:09:48 +10002316 c->self, win_len, c->local_window);
Damien Miller33b13562000-04-04 14:38:59 +10002317 return;
2318 }
Damien Miller7d457182010-08-05 23:09:48 +10002319 c->local_window -= win_len;
Damien Miller33b13562000-04-04 14:38:59 +10002320 }
Damien Millerd27b9472005-12-13 19:29:02 +11002321 if (c->datagram)
2322 buffer_put_string(&c->output, data, data_len);
2323 else
2324 buffer_append(&c->output, data, data_len);
Damien Millerdb255ca2008-05-19 14:59:37 +10002325 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002326}
Ben Lindstrome9c99912001-06-09 00:41:05 +00002327
Damien Millerd79b4242006-03-31 23:11:44 +11002328/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002329void
Damien Miller630d6f42002-01-22 23:17:30 +11002330channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002331{
2332 int id;
Damien Miller33b13562000-04-04 14:38:59 +10002333 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00002334 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10002335 Channel *c;
2336
2337 /* Get the channel number and verify it. */
2338 id = packet_get_int();
2339 c = channel_lookup(id);
2340
2341 if (c == NULL)
2342 packet_disconnect("Received extended_data for bad channel %d.", id);
2343 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002344 logit("channel %d: ext data for non open", id);
Damien Miller33b13562000-04-04 14:38:59 +10002345 return;
2346 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002347 if (c->flags & CHAN_EOF_RCVD) {
2348 if (datafellows & SSH_BUG_EXTEOF)
2349 debug("channel %d: accepting ext data after eof", id);
2350 else
2351 packet_disconnect("Received extended_data after EOF "
2352 "on channel %d.", id);
2353 }
Damien Miller33b13562000-04-04 14:38:59 +10002354 tcode = packet_get_int();
2355 if (c->efd == -1 ||
2356 c->extended_usage != CHAN_EXTENDED_WRITE ||
2357 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002358 logit("channel %d: bad ext data", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002359 return;
2360 }
2361 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002362 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002363 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002364 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002365 c->self, data_len, c->local_window);
2366 xfree(data);
2367 return;
2368 }
Damien Millerd3444942000-09-30 14:20:03 +11002369 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002370 c->local_window -= data_len;
2371 buffer_append(&c->extended, data, data_len);
2372 xfree(data);
2373}
2374
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_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002378{
2379 int id;
2380 Channel *c;
2381
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 ieof for nonexistent channel %d.", id);
2387 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002388
2389 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002390 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002391 debug("channel %d: FORCE input drain", c->self);
2392 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002393 if (buffer_len(&c->input) == 0)
2394 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002395 }
2396
Damien Millerb38eff82000-04-01 11:09:21 +10002397}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002398
Damien Millerd79b4242006-03-31 23:11:44 +11002399/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002400void
Damien Miller630d6f42002-01-22 23:17:30 +11002401channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002402{
Damien Millerb38eff82000-04-01 11:09:21 +10002403 int id;
2404 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002405
Damien Millerb38eff82000-04-01 11:09:21 +10002406 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002407 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002408 c = channel_lookup(id);
2409 if (c == NULL)
2410 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002411
2412 /*
2413 * Send a confirmation that we have closed the channel and no more
2414 * data is coming for it.
2415 */
Damien Miller95def091999-11-25 00:26:21 +11002416 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002417 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002418 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002419
Damien Miller5428f641999-11-25 11:54:57 +11002420 /*
2421 * If the channel is in closed state, we have sent a close request,
2422 * and the other side will eventually respond with a confirmation.
2423 * Thus, we cannot free the channel here, because then there would be
2424 * no-one to receive the confirmation. The channel gets freed when
2425 * the confirmation arrives.
2426 */
Damien Millerb38eff82000-04-01 11:09:21 +10002427 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002428 /*
2429 * Not a closed channel - mark it as draining, which will
2430 * cause it to be freed later.
2431 */
Damien Miller76765c02002-01-22 23:21:15 +11002432 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002433 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002434 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002435}
2436
Damien Millerb38eff82000-04-01 11:09:21 +10002437/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Millerd79b4242006-03-31 23:11:44 +11002438/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002439void
Damien Miller630d6f42002-01-22 23:17:30 +11002440channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002441{
Damien Millerb38eff82000-04-01 11:09:21 +10002442 int id = packet_get_int();
2443 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002444
Damien Miller48b03fc2002-01-22 23:11:40 +11002445 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002446 if (c == NULL)
2447 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2448 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002449}
2450
Damien Millerd79b4242006-03-31 23:11:44 +11002451/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002452void
Damien Miller630d6f42002-01-22 23:17:30 +11002453channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002454{
2455 int id = packet_get_int();
2456 Channel *c = channel_lookup(id);
2457
Damien Miller48b03fc2002-01-22 23:11:40 +11002458 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002459 if (c == NULL)
2460 packet_disconnect("Received close confirmation for "
2461 "out-of-range channel %d.", id);
2462 if (c->type != SSH_CHANNEL_CLOSED)
2463 packet_disconnect("Received close confirmation for "
2464 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002465 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002466}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002467
Damien Millerd79b4242006-03-31 23:11:44 +11002468/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002469void
Damien Miller630d6f42002-01-22 23:17:30 +11002470channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002471{
Damien Millerb38eff82000-04-01 11:09:21 +10002472 int id, remote_id;
2473 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002474
Damien Millerb38eff82000-04-01 11:09:21 +10002475 id = packet_get_int();
2476 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002477
Damien Millerb38eff82000-04-01 11:09:21 +10002478 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2479 packet_disconnect("Received open confirmation for "
2480 "non-opening channel %d.", id);
2481 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002482 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002483 c->remote_id = remote_id;
2484 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002485
2486 if (compat20) {
2487 c->remote_window = packet_get_int();
2488 c->remote_maxpacket = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002489 if (c->open_confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002490 debug2("callback start");
Damien Millerd530f5f2010-05-21 14:57:10 +10002491 c->open_confirm(c->self, 1, c->open_confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002492 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002493 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002494 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002495 c->remote_window, c->remote_maxpacket);
2496 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002497 packet_check_eom();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002498}
2499
Ben Lindstrombba81212001-06-25 05:01:22 +00002500static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002501reason2txt(int reason)
2502{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002503 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002504 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2505 return "administratively prohibited";
2506 case SSH2_OPEN_CONNECT_FAILED:
2507 return "connect failed";
2508 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2509 return "unknown channel type";
2510 case SSH2_OPEN_RESOURCE_SHORTAGE:
2511 return "resource shortage";
2512 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002513 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002514}
2515
Damien Millerd79b4242006-03-31 23:11:44 +11002516/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002517void
Damien Miller630d6f42002-01-22 23:17:30 +11002518channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002519{
Kevin Steves12057502001-02-05 14:54:34 +00002520 int id, reason;
2521 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002522 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002523
Damien Millerb38eff82000-04-01 11:09:21 +10002524 id = packet_get_int();
2525 c = channel_lookup(id);
2526
2527 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2528 packet_disconnect("Received open failure for "
2529 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002530 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002531 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002532 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002533 msg = packet_get_string(NULL);
2534 lang = packet_get_string(NULL);
2535 }
Damien Miller996acd22003-04-09 20:59:48 +10002536 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002537 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00002538 if (msg != NULL)
2539 xfree(msg);
2540 if (lang != NULL)
2541 xfree(lang);
Damien Millerd530f5f2010-05-21 14:57:10 +10002542 if (c->open_confirm) {
2543 debug2("callback start");
2544 c->open_confirm(c->self, 0, c->open_confirm_ctx);
2545 debug2("callback done");
2546 }
Damien Miller33b13562000-04-04 14:38:59 +10002547 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002548 packet_check_eom();
Damien Miller7a606212009-01-28 16:22:34 +11002549 /* Schedule the channel for cleanup/deletion. */
2550 chan_mark_dead(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002551}
2552
Damien Millerd79b4242006-03-31 23:11:44 +11002553/* ARGSUSED */
Damien Miller33b13562000-04-04 14:38:59 +10002554void
Damien Miller630d6f42002-01-22 23:17:30 +11002555channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002556{
2557 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002558 int id;
2559 u_int adjust;
Damien Miller33b13562000-04-04 14:38:59 +10002560
2561 if (!compat20)
2562 return;
2563
2564 /* Get the channel number and verify it. */
2565 id = packet_get_int();
2566 c = channel_lookup(id);
2567
Damien Millerd47c62a2005-12-13 19:33:57 +11002568 if (c == NULL) {
2569 logit("Received window adjust for non-open channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002570 return;
2571 }
2572 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002573 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002574 debug2("channel %d: rcvd adjust %u", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10002575 c->remote_window += adjust;
2576}
2577
Damien Millerd79b4242006-03-31 23:11:44 +11002578/* ARGSUSED */
Damien Miller4af51302000-04-16 11:18:38 +10002579void
Damien Miller630d6f42002-01-22 23:17:30 +11002580channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002581{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002582 Channel *c = NULL;
2583 u_short host_port;
2584 char *host, *originator_string;
Damien Millerbd740252008-05-19 15:37:09 +10002585 int remote_id;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002586
Ben Lindstrome9c99912001-06-09 00:41:05 +00002587 remote_id = packet_get_int();
2588 host = packet_get_string(NULL);
2589 host_port = packet_get_int();
2590
2591 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2592 originator_string = packet_get_string(NULL);
2593 } else {
2594 originator_string = xstrdup("unknown (remote did not supply name)");
2595 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002596 packet_check_eom();
Damien Millerbd740252008-05-19 15:37:09 +10002597 c = channel_connect_to(host, host_port,
2598 "connected socket", originator_string);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002599 xfree(originator_string);
Damien Millerbd740252008-05-19 15:37:09 +10002600 xfree(host);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002601 if (c == NULL) {
2602 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2603 packet_put_int(remote_id);
2604 packet_send();
Damien Millerbd740252008-05-19 15:37:09 +10002605 } else
2606 c->remote_id = remote_id;
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002607}
2608
Damien Millerb84886b2008-05-19 15:05:07 +10002609/* ARGSUSED */
2610void
2611channel_input_status_confirm(int type, u_int32_t seq, void *ctxt)
2612{
2613 Channel *c;
2614 struct channel_confirm *cc;
Damien Miller16a73072008-12-08 09:55:25 +11002615 int id;
Damien Millerb84886b2008-05-19 15:05:07 +10002616
2617 /* Reset keepalive timeout */
Darren Tuckerf7288d72009-06-21 18:12:20 +10002618 packet_set_alive_timeouts(0);
Damien Millerb84886b2008-05-19 15:05:07 +10002619
Damien Miller16a73072008-12-08 09:55:25 +11002620 id = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002621 packet_check_eom();
2622
Damien Miller16a73072008-12-08 09:55:25 +11002623 debug2("channel_input_status_confirm: type %d id %d", type, id);
Damien Millerb84886b2008-05-19 15:05:07 +10002624
Damien Miller16a73072008-12-08 09:55:25 +11002625 if ((c = channel_lookup(id)) == NULL) {
2626 logit("channel_input_status_confirm: %d: unknown", id);
Damien Millerb84886b2008-05-19 15:05:07 +10002627 return;
2628 }
2629 ;
2630 if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
2631 return;
2632 cc->cb(type, c, cc->ctx);
2633 TAILQ_REMOVE(&c->status_confirms, cc, entry);
2634 bzero(cc, sizeof(*cc));
2635 xfree(cc);
2636}
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002637
Ben Lindstrome9c99912001-06-09 00:41:05 +00002638/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002639
Ben Lindstrom908afed2001-10-03 17:34:59 +00002640void
2641channel_set_af(int af)
2642{
2643 IPv4or6 = af;
2644}
2645
Damien Millerf6dff7c2011-09-22 21:38:52 +10002646
2647/*
2648 * Determine whether or not a port forward listens to loopback, the
2649 * 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 specification
2652 * and force a wildcard bind, whereas a value of 2 (``clientspecified'')
2653 * will bind to whatever address the client asked for.
2654 *
2655 * Special-case listen_addrs are:
2656 *
2657 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2658 * "" (empty string), "*" -> wildcard v4/v6
2659 * "localhost" -> loopback v4/v6
2660 */
2661static const char *
2662channel_fwd_bind_addr(const char *listen_addr, int *wildcardp,
2663 int is_client, int gateway_ports)
2664{
2665 const char *addr = NULL;
2666 int wildcard = 0;
2667
2668 if (listen_addr == NULL) {
2669 /* No address specified: default to gateway_ports setting */
2670 if (gateway_ports)
2671 wildcard = 1;
2672 } else if (gateway_ports || is_client) {
2673 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
2674 strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
2675 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
2676 (!is_client && gateway_ports == 1))
2677 wildcard = 1;
2678 else if (strcmp(listen_addr, "localhost") != 0)
2679 addr = listen_addr;
2680 }
2681 if (wildcardp != NULL)
2682 *wildcardp = wildcard;
2683 return addr;
2684}
2685
Damien Millerb16461c2002-01-22 23:29:22 +11002686static int
Damien Miller4bf648f2009-02-14 16:28:21 +11002687channel_setup_fwd_listener(int type, const char *listen_addr,
2688 u_short listen_port, int *allocated_listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002689 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002690{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002691 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002692 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002693 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002694 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002695 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller4bf648f2009-02-14 16:28:21 +11002696 in_port_t *lport_p;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002697
Damien Millerb16461c2002-01-22 23:29:22 +11002698 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2699 listen_addr : host_to_connect;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002700 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002701
Damien Millerb16461c2002-01-22 23:29:22 +11002702 if (host == NULL) {
2703 error("No forward host name.");
Damien Millera7270302005-07-06 09:36:05 +10002704 return 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002705 }
Damien Miller9576ac42009-01-28 16:30:33 +11002706 if (strlen(host) >= NI_MAXHOST) {
Kevin Steves12057502001-02-05 14:54:34 +00002707 error("Forward host name too long.");
Damien Millera7270302005-07-06 09:36:05 +10002708 return 0;
Kevin Steves12057502001-02-05 14:54:34 +00002709 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002710
Damien Millerf6dff7c2011-09-22 21:38:52 +10002711 /* Determine the bind address, cf. channel_fwd_bind_addr() comment */
2712 addr = channel_fwd_bind_addr(listen_addr, &wildcard,
2713 is_client, gateway_ports);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002714 debug3("channel_setup_fwd_listener: type %d wildcard %d addr %s",
2715 type, wildcard, (addr == NULL) ? "NULL" : addr);
2716
2717 /*
Damien Miller34132e52000-01-14 15:45:46 +11002718 * getaddrinfo returns a loopback address if the hostname is
2719 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002720 */
Damien Miller34132e52000-01-14 15:45:46 +11002721 memset(&hints, 0, sizeof(hints));
2722 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002723 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002724 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002725 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002726 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2727 if (addr == NULL) {
2728 /* This really shouldn't happen */
2729 packet_disconnect("getaddrinfo: fatal error: %s",
Darren Tucker4abde772007-12-29 02:43:51 +11002730 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002731 } else {
Damien Millera7270302005-07-06 09:36:05 +10002732 error("channel_setup_fwd_listener: "
Darren Tucker4abde772007-12-29 02:43:51 +11002733 "getaddrinfo(%.64s): %s", addr,
2734 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002735 }
Damien Millera7270302005-07-06 09:36:05 +10002736 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002737 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002738 if (allocated_listen_port != NULL)
2739 *allocated_listen_port = 0;
Damien Miller34132e52000-01-14 15:45:46 +11002740 for (ai = aitop; ai; ai = ai->ai_next) {
Damien Miller4bf648f2009-02-14 16:28:21 +11002741 switch (ai->ai_family) {
2742 case AF_INET:
2743 lport_p = &((struct sockaddr_in *)ai->ai_addr)->
2744 sin_port;
2745 break;
2746 case AF_INET6:
2747 lport_p = &((struct sockaddr_in6 *)ai->ai_addr)->
2748 sin6_port;
2749 break;
2750 default:
Damien Miller34132e52000-01-14 15:45:46 +11002751 continue;
Damien Miller4bf648f2009-02-14 16:28:21 +11002752 }
2753 /*
2754 * If allocating a port for -R forwards, then use the
2755 * same port for all address families.
2756 */
2757 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2758 allocated_listen_port != NULL && *allocated_listen_port > 0)
2759 *lport_p = htons(*allocated_listen_port);
2760
Damien Miller34132e52000-01-14 15:45:46 +11002761 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2762 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Millerb16461c2002-01-22 23:29:22 +11002763 error("channel_setup_fwd_listener: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002764 continue;
2765 }
2766 /* Create a port to listen for the host. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11002767 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002768 if (sock < 0) {
2769 /* this is no error since kernel may not support ipv6 */
2770 verbose("socket: %.100s", strerror(errno));
2771 continue;
2772 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002773
2774 channel_set_reuseaddr(sock);
Damien Miller04ee0f82009-11-18 17:48:30 +11002775 if (ai->ai_family == AF_INET6)
2776 sock_set_v6only(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002777
Damien Miller4bf648f2009-02-14 16:28:21 +11002778 debug("Local forwarding listening on %s port %s.",
2779 ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002780
Damien Miller34132e52000-01-14 15:45:46 +11002781 /* Bind the socket to the address. */
2782 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2783 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002784 if (!ai->ai_next)
2785 error("bind: %.100s", strerror(errno));
2786 else
2787 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002788
Damien Miller34132e52000-01-14 15:45:46 +11002789 close(sock);
2790 continue;
2791 }
2792 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002793 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002794 error("listen: %.100s", strerror(errno));
2795 close(sock);
2796 continue;
2797 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002798
2799 /*
2800 * listen_port == 0 requests a dynamically allocated port -
2801 * record what we got.
2802 */
2803 if (type == SSH_CHANNEL_RPORT_LISTENER && listen_port == 0 &&
2804 allocated_listen_port != NULL &&
2805 *allocated_listen_port == 0) {
2806 *allocated_listen_port = get_sock_port(sock, 1);
2807 debug("Allocated listen port %d",
2808 *allocated_listen_port);
2809 }
2810
Damien Miller34132e52000-01-14 15:45:46 +11002811 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002812 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002813 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002814 0, "port listener", 1);
Damien Millera1c1b6c2009-01-28 16:29:49 +11002815 c->path = xstrdup(host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002816 c->host_port = port_to_connect;
Damien Millerf6dff7c2011-09-22 21:38:52 +10002817 c->listening_addr = addr == NULL ? NULL : xstrdup(addr);
Darren Tucker68afb8c2011-10-02 18:59:03 +11002818 if (listen_port == 0 && allocated_listen_port != NULL &&
2819 !(datafellows & SSH_BUG_DYNAMIC_RPORT))
2820 c->listening_port = *allocated_listen_port;
2821 else
2822 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002823 success = 1;
2824 }
2825 if (success == 0)
Damien Millerb16461c2002-01-22 23:29:22 +11002826 error("channel_setup_fwd_listener: cannot listen to port: %d",
Kevin Steves12057502001-02-05 14:54:34 +00002827 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002828 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002829 return success;
Damien Miller95def091999-11-25 00:26:21 +11002830}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002831
Darren Tuckere7066df2004-05-24 10:18:05 +10002832int
2833channel_cancel_rport_listener(const char *host, u_short port)
2834{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002835 u_int i;
2836 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10002837
Darren Tucker47eede72005-03-14 23:08:12 +11002838 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10002839 Channel *c = channels[i];
Damien Millerf6dff7c2011-09-22 21:38:52 +10002840 if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER)
2841 continue;
2842 if (strcmp(c->path, host) == 0 && c->listening_port == port) {
2843 debug2("%s: close channel %d", __func__, i);
2844 channel_free(c);
2845 found = 1;
2846 }
2847 }
Darren Tuckere7066df2004-05-24 10:18:05 +10002848
Damien Millerf6dff7c2011-09-22 21:38:52 +10002849 return (found);
2850}
2851
2852int
2853channel_cancel_lport_listener(const char *lhost, u_short lport,
Damien Millerff773642011-09-22 21:39:48 +10002854 int cport, int gateway_ports)
Damien Millerf6dff7c2011-09-22 21:38:52 +10002855{
2856 u_int i;
2857 int found = 0;
2858 const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, gateway_ports);
2859
2860 for (i = 0; i < channels_alloc; i++) {
2861 Channel *c = channels[i];
2862 if (c == NULL || c->type != SSH_CHANNEL_PORT_LISTENER)
2863 continue;
Damien Millerff773642011-09-22 21:39:48 +10002864 if (c->listening_port != lport)
Damien Millerf6dff7c2011-09-22 21:38:52 +10002865 continue;
Damien Millerff773642011-09-22 21:39:48 +10002866 if (cport == CHANNEL_CANCEL_PORT_STATIC) {
2867 /* skip dynamic forwardings */
2868 if (c->host_port == 0)
2869 continue;
2870 } else {
2871 if (c->host_port != cport)
2872 continue;
2873 }
Damien Millerf6dff7c2011-09-22 21:38:52 +10002874 if ((c->listening_addr == NULL && addr != NULL) ||
2875 (c->listening_addr != NULL && addr == NULL))
2876 continue;
2877 if (addr == NULL || strcmp(c->listening_addr, addr) == 0) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10002878 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10002879 channel_free(c);
2880 found = 1;
2881 }
2882 }
2883
2884 return (found);
2885}
2886
Damien Millerb16461c2002-01-22 23:29:22 +11002887/* protocol local port fwd, used by ssh (and sshd in v1) */
2888int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002889channel_setup_local_fwd_listener(const char *listen_host, u_short listen_port,
Damien Millerb16461c2002-01-22 23:29:22 +11002890 const char *host_to_connect, u_short port_to_connect, int gateway_ports)
2891{
2892 return channel_setup_fwd_listener(SSH_CHANNEL_PORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002893 listen_host, listen_port, NULL, host_to_connect, port_to_connect,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002894 gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002895}
2896
2897/* protocol v2 remote port fwd, used by sshd */
2898int
2899channel_setup_remote_fwd_listener(const char *listen_address,
Damien Miller4bf648f2009-02-14 16:28:21 +11002900 u_short listen_port, int *allocated_listen_port, int gateway_ports)
Damien Millerb16461c2002-01-22 23:29:22 +11002901{
2902 return channel_setup_fwd_listener(SSH_CHANNEL_RPORT_LISTENER,
Damien Miller4bf648f2009-02-14 16:28:21 +11002903 listen_address, listen_port, allocated_listen_port,
2904 NULL, 0, gateway_ports);
Damien Millerb16461c2002-01-22 23:29:22 +11002905}
2906
Damien Miller5428f641999-11-25 11:54:57 +11002907/*
Damien Millerf6dff7c2011-09-22 21:38:52 +10002908 * Translate the requested rfwd listen host to something usable for
2909 * this server.
2910 */
2911static const char *
2912channel_rfwd_bind_host(const char *listen_host)
2913{
2914 if (listen_host == NULL) {
2915 if (datafellows & SSH_BUG_RFWD_ADDR)
2916 return "127.0.0.1";
2917 else
2918 return "localhost";
2919 } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) {
2920 if (datafellows & SSH_BUG_RFWD_ADDR)
2921 return "0.0.0.0";
2922 else
2923 return "";
2924 } else
2925 return listen_host;
2926}
2927
2928/*
Damien Miller5428f641999-11-25 11:54:57 +11002929 * Initiate forwarding of connections to port "port" on remote host through
2930 * the secure channel to host:port from local side.
Darren Tucker68afb8c2011-10-02 18:59:03 +11002931 * Returns handle (index) for updating the dynamic listen port with
2932 * channel_update_permitted_opens().
Damien Miller5428f641999-11-25 11:54:57 +11002933 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10002934int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002935channel_request_remote_forwarding(const char *listen_host, u_short listen_port,
Damien Miller0bc1bd82000-11-13 22:57:25 +11002936 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002937{
Darren Tucker68afb8c2011-10-02 18:59:03 +11002938 int type, success = 0, idx = -1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002939
Damien Miller95def091999-11-25 00:26:21 +11002940 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10002941 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10002942 packet_start(SSH2_MSG_GLOBAL_REQUEST);
2943 packet_put_cstring("tcpip-forward");
Damien Millerf6dff7c2011-09-22 21:38:52 +10002944 packet_put_char(1); /* boolean: want reply */
2945 packet_put_cstring(channel_rfwd_bind_host(listen_host));
Damien Miller33b13562000-04-04 14:38:59 +10002946 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002947 packet_send();
2948 packet_write_wait();
2949 /* Assume that server accepts the request */
2950 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10002951 } else {
2952 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10002953 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10002954 packet_put_cstring(host_to_connect);
2955 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10002956 packet_send();
2957 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002958
2959 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11002960 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11002961 switch (type) {
2962 case SSH_SMSG_SUCCESS:
2963 success = 1;
2964 break;
2965 case SSH_SMSG_FAILURE:
Damien Miller0bc1bd82000-11-13 22:57:25 +11002966 break;
2967 default:
2968 /* Unknown packet */
2969 packet_disconnect("Protocol error for port forward request:"
2970 "received packet type %d.", type);
2971 }
2972 }
2973 if (success) {
Damien Miller232cfb12010-06-26 09:50:30 +10002974 /* Record that connection to this host/port is permitted. */
2975 permitted_opens = xrealloc(permitted_opens,
2976 num_permitted_opens + 1, sizeof(*permitted_opens));
Darren Tucker68afb8c2011-10-02 18:59:03 +11002977 idx = num_permitted_opens++;
2978 permitted_opens[idx].host_to_connect = xstrdup(host_to_connect);
2979 permitted_opens[idx].port_to_connect = port_to_connect;
2980 permitted_opens[idx].listen_port = listen_port;
Damien Miller33b13562000-04-04 14:38:59 +10002981 }
Darren Tucker68afb8c2011-10-02 18:59:03 +11002982 return (idx);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002983}
2984
Damien Miller5428f641999-11-25 11:54:57 +11002985/*
Darren Tuckerfc959702004-07-17 16:12:08 +10002986 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10002987 * local side.
2988 */
Damien Millerf6dff7c2011-09-22 21:38:52 +10002989int
Damien Millerf91ee4c2005-03-01 21:24:33 +11002990channel_request_rforward_cancel(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10002991{
2992 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10002993
2994 if (!compat20)
Damien Millerf6dff7c2011-09-22 21:38:52 +10002995 return -1;
Darren Tuckere7066df2004-05-24 10:18:05 +10002996
2997 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckerfc959702004-07-17 16:12:08 +10002998 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tuckere7066df2004-05-24 10:18:05 +10002999 permitted_opens[i].listen_port == port)
3000 break;
3001 }
3002 if (i >= num_permitted_opens) {
3003 debug("%s: requested forward not found", __func__);
Damien Millerf6dff7c2011-09-22 21:38:52 +10003004 return -1;
Darren Tuckere7066df2004-05-24 10:18:05 +10003005 }
3006 packet_start(SSH2_MSG_GLOBAL_REQUEST);
3007 packet_put_cstring("cancel-tcpip-forward");
3008 packet_put_char(0);
Damien Millerf6dff7c2011-09-22 21:38:52 +10003009 packet_put_cstring(channel_rfwd_bind_host(host));
Darren Tuckere7066df2004-05-24 10:18:05 +10003010 packet_put_int(port);
3011 packet_send();
3012
3013 permitted_opens[i].listen_port = 0;
3014 permitted_opens[i].port_to_connect = 0;
Damien Miller0a0176e2005-11-05 15:07:59 +11003015 xfree(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10003016 permitted_opens[i].host_to_connect = NULL;
Damien Millerf6dff7c2011-09-22 21:38:52 +10003017
3018 return 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10003019}
3020
3021/*
Damien Miller5428f641999-11-25 11:54:57 +11003022 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
3023 * listening for the port, and sends back a success reply (or disconnect
Darren Tuckere7d4b192006-07-12 22:17:10 +10003024 * message if there was an error).
Damien Miller5428f641999-11-25 11:54:57 +11003025 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10003026int
Damien Millere247cc42000-05-07 12:03:14 +10003027channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003028{
Damien Milleraae6c611999-12-06 11:47:28 +11003029 u_short port, host_port;
Darren Tuckere7d4b192006-07-12 22:17:10 +10003030 int success = 0;
Damien Miller95def091999-11-25 00:26:21 +11003031 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003032
Damien Miller95def091999-11-25 00:26:21 +11003033 /* Get arguments from the packet. */
3034 port = packet_get_int();
3035 hostname = packet_get_string(NULL);
3036 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003037
Damien Millerbac2d8a2000-09-05 16:13:06 +11003038#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11003039 /*
3040 * Check that an unprivileged user is not trying to forward a
3041 * privileged port.
3042 */
Damien Miller95def091999-11-25 00:26:21 +11003043 if (port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10003044 packet_disconnect(
3045 "Requested forwarding of port %d but user is not root.",
3046 port);
3047 if (host_port == 0)
3048 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11003049#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10003050
Damien Miller0bc1bd82000-11-13 22:57:25 +11003051 /* Initiate forwarding */
Darren Tuckere7d4b192006-07-12 22:17:10 +10003052 success = channel_setup_local_fwd_listener(NULL, port, hostname,
Damien Millerf91ee4c2005-03-01 21:24:33 +11003053 host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11003054
3055 /* Free the argument string. */
3056 xfree(hostname);
Darren Tuckere7d4b192006-07-12 22:17:10 +10003057
3058 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003059}
3060
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003061/*
3062 * Permits opening to any host/port if permitted_opens[] is empty. This is
3063 * usually called by the server, because the user could connect to any port
3064 * anyway, and the server has no way to know but to trust the client anyway.
3065 */
3066void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003067channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003068{
3069 if (num_permitted_opens == 0)
3070 all_opens_permitted = 1;
3071}
3072
Ben Lindstroma3700052001-04-05 23:26:32 +00003073void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003074channel_add_permitted_opens(char *host, int port)
3075{
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003076 debug("allow port forwarding to host %s port %d", host, port);
3077
Damien Miller232cfb12010-06-26 09:50:30 +10003078 permitted_opens = xrealloc(permitted_opens,
3079 num_permitted_opens + 1, sizeof(*permitted_opens));
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003080 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
3081 permitted_opens[num_permitted_opens].port_to_connect = port;
3082 num_permitted_opens++;
3083
3084 all_opens_permitted = 0;
3085}
3086
Darren Tucker68afb8c2011-10-02 18:59:03 +11003087/*
3088 * Update the listen port for a dynamic remote forward, after
3089 * the actual 'newport' has been allocated. If 'newport' < 0 is
3090 * passed then they entry will be invalidated.
3091 */
3092void
3093channel_update_permitted_opens(int idx, int newport)
3094{
3095 if (idx < 0 || idx >= num_permitted_opens) {
3096 debug("channel_update_permitted_opens: index out of range:"
3097 " %d num_permitted_opens %d", idx, num_permitted_opens);
3098 return;
3099 }
3100 debug("%s allowed port %d for forwarding to host %s port %d",
3101 newport > 0 ? "Updating" : "Removing",
3102 newport,
3103 permitted_opens[idx].host_to_connect,
3104 permitted_opens[idx].port_to_connect);
3105 if (newport >= 0) {
3106 permitted_opens[idx].listen_port =
3107 (datafellows & SSH_BUG_DYNAMIC_RPORT) ? 0 : newport;
3108 } else {
3109 permitted_opens[idx].listen_port = 0;
3110 permitted_opens[idx].port_to_connect = 0;
3111 xfree(permitted_opens[idx].host_to_connect);
3112 permitted_opens[idx].host_to_connect = NULL;
3113 }
3114}
3115
Damien Millera765cf42006-07-24 14:08:13 +10003116int
Damien Miller9b439df2006-07-24 14:04:00 +10003117channel_add_adm_permitted_opens(char *host, int port)
3118{
Damien Millera765cf42006-07-24 14:08:13 +10003119 debug("config allows port forwarding to host %s port %d", host, port);
Damien Miller9b439df2006-07-24 14:04:00 +10003120
Damien Miller232cfb12010-06-26 09:50:30 +10003121 permitted_adm_opens = xrealloc(permitted_adm_opens,
3122 num_adm_permitted_opens + 1, sizeof(*permitted_adm_opens));
Damien Miller9b439df2006-07-24 14:04:00 +10003123 permitted_adm_opens[num_adm_permitted_opens].host_to_connect
3124 = xstrdup(host);
3125 permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
Damien Millera765cf42006-07-24 14:08:13 +10003126 return ++num_adm_permitted_opens;
Damien Miller9b439df2006-07-24 14:04:00 +10003127}
3128
3129void
Damien Millerc6081482012-04-22 11:18:53 +10003130channel_disable_adm_local_opens(void)
3131{
3132 if (num_adm_permitted_opens == 0) {
3133 permitted_adm_opens = xmalloc(sizeof(*permitted_adm_opens));
3134 permitted_adm_opens[num_adm_permitted_opens].host_to_connect
3135 = NULL;
3136 num_adm_permitted_opens = 1;
3137 }
3138}
3139
3140void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003141channel_clear_permitted_opens(void)
3142{
3143 int i;
3144
3145 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10003146 if (permitted_opens[i].host_to_connect != NULL)
3147 xfree(permitted_opens[i].host_to_connect);
Damien Miller232cfb12010-06-26 09:50:30 +10003148 if (num_permitted_opens > 0) {
3149 xfree(permitted_opens);
3150 permitted_opens = NULL;
3151 }
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003152 num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +10003153}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003154
Damien Miller9b439df2006-07-24 14:04:00 +10003155void
3156channel_clear_adm_permitted_opens(void)
3157{
3158 int i;
3159
3160 for (i = 0; i < num_adm_permitted_opens; i++)
3161 if (permitted_adm_opens[i].host_to_connect != NULL)
3162 xfree(permitted_adm_opens[i].host_to_connect);
Damien Miller232cfb12010-06-26 09:50:30 +10003163 if (num_adm_permitted_opens > 0) {
3164 xfree(permitted_adm_opens);
3165 permitted_adm_opens = NULL;
3166 }
Damien Miller9b439df2006-07-24 14:04:00 +10003167 num_adm_permitted_opens = 0;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003168}
3169
Darren Tuckere7140f22008-06-10 23:01:51 +10003170void
3171channel_print_adm_permitted_opens(void)
3172{
Damien Miller6ef17492008-07-16 22:42:06 +10003173 int i;
Darren Tuckere7140f22008-06-10 23:01:51 +10003174
Damien Millerb53d8a12009-01-28 16:13:04 +11003175 printf("permitopen");
Darren Tucker22662e82008-11-11 16:40:22 +11003176 if (num_adm_permitted_opens == 0) {
Damien Millerb53d8a12009-01-28 16:13:04 +11003177 printf(" any\n");
Darren Tucker22662e82008-11-11 16:40:22 +11003178 return;
3179 }
Darren Tuckere7140f22008-06-10 23:01:51 +10003180 for (i = 0; i < num_adm_permitted_opens; i++)
Damien Millerc6081482012-04-22 11:18:53 +10003181 if (permitted_adm_opens[i].host_to_connect == NULL)
3182 printf(" none");
3183 else
Darren Tuckere7140f22008-06-10 23:01:51 +10003184 printf(" %s:%d", permitted_adm_opens[i].host_to_connect,
3185 permitted_adm_opens[i].port_to_connect);
Damien Millerb53d8a12009-01-28 16:13:04 +11003186 printf("\n");
Darren Tuckere7140f22008-06-10 23:01:51 +10003187}
3188
Darren Tucker1338b9e2011-10-02 18:57:35 +11003189/* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */
3190int
3191permitopen_port(const char *p)
3192{
3193 int port;
3194
3195 if (strcmp(p, "*") == 0)
3196 return FWD_PERMIT_ANY_PORT;
3197 if ((port = a2port(p)) > 0)
3198 return port;
3199 return -1;
3200}
3201
3202static int
3203port_match(u_short allowedport, u_short requestedport)
3204{
3205 if (allowedport == FWD_PERMIT_ANY_PORT ||
3206 allowedport == requestedport)
3207 return 1;
3208 return 0;
3209}
3210
Damien Millerbd740252008-05-19 15:37:09 +10003211/* Try to start non-blocking connect to next host in cctx list */
Ben Lindstrombba81212001-06-25 05:01:22 +00003212static int
Damien Millerbd740252008-05-19 15:37:09 +10003213connect_next(struct channel_connect *cctx)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003214{
Damien Millerbd740252008-05-19 15:37:09 +10003215 int sock, saved_errno;
Damien Miller34132e52000-01-14 15:45:46 +11003216 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller95def091999-11-25 00:26:21 +11003217
Damien Millerbd740252008-05-19 15:37:09 +10003218 for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
3219 if (cctx->ai->ai_family != AF_INET &&
3220 cctx->ai->ai_family != AF_INET6)
Damien Miller34132e52000-01-14 15:45:46 +11003221 continue;
Damien Millerbd740252008-05-19 15:37:09 +10003222 if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
3223 ntop, sizeof(ntop), strport, sizeof(strport),
3224 NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
3225 error("connect_next: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11003226 continue;
3227 }
Darren Tucker7bd98e72010-01-10 10:31:12 +11003228 if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
3229 cctx->ai->ai_protocol)) == -1) {
Damien Millerbd740252008-05-19 15:37:09 +10003230 if (cctx->ai->ai_next == NULL)
Damien Millerb46b9f32003-01-10 21:45:12 +11003231 error("socket: %.100s", strerror(errno));
3232 else
3233 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003234 continue;
3235 }
Damien Miller232711f2004-06-15 10:35:30 +10003236 if (set_nonblock(sock) == -1)
3237 fatal("%s: set_nonblock(%d)", __func__, sock);
Damien Millerbd740252008-05-19 15:37:09 +10003238 if (connect(sock, cctx->ai->ai_addr,
3239 cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
3240 debug("connect_next: host %.100s ([%.100s]:%s): "
3241 "%.100s", cctx->host, ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11003242 strerror(errno));
Damien Millerbd740252008-05-19 15:37:09 +10003243 saved_errno = errno;
Damien Miller34132e52000-01-14 15:45:46 +11003244 close(sock);
Damien Millerbd740252008-05-19 15:37:09 +10003245 errno = saved_errno;
Kevin Stevesef4eea92001-02-05 12:42:17 +00003246 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11003247 }
Damien Millerbd740252008-05-19 15:37:09 +10003248 debug("connect_next: host %.100s ([%.100s]:%s) "
3249 "in progress, fd=%d", cctx->host, ntop, strport, sock);
3250 cctx->ai = cctx->ai->ai_next;
3251 set_nodelay(sock);
3252 return sock;
Damien Miller34132e52000-01-14 15:45:46 +11003253 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11003254 return -1;
3255}
Damien Millerb38eff82000-04-01 11:09:21 +10003256
Damien Millerbd740252008-05-19 15:37:09 +10003257static void
3258channel_connect_ctx_free(struct channel_connect *cctx)
3259{
3260 xfree(cctx->host);
3261 if (cctx->aitop)
3262 freeaddrinfo(cctx->aitop);
3263 bzero(cctx, sizeof(*cctx));
3264 cctx->host = NULL;
3265 cctx->ai = cctx->aitop = NULL;
3266}
3267
3268/* Return CONNECTING channel to remote host, port */
3269static Channel *
3270connect_to(const char *host, u_short port, char *ctype, char *rname)
3271{
3272 struct addrinfo hints;
3273 int gaierr;
3274 int sock = -1;
3275 char strport[NI_MAXSERV];
3276 struct channel_connect cctx;
3277 Channel *c;
3278
Damien Miller2bcb8662008-07-12 17:12:29 +10003279 memset(&cctx, 0, sizeof(cctx));
Damien Millerbd740252008-05-19 15:37:09 +10003280 memset(&hints, 0, sizeof(hints));
3281 hints.ai_family = IPv4or6;
3282 hints.ai_socktype = SOCK_STREAM;
3283 snprintf(strport, sizeof strport, "%d", port);
3284 if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) {
3285 error("connect_to %.100s: unknown host (%s)", host,
3286 ssh_gai_strerror(gaierr));
3287 return NULL;
3288 }
3289
3290 cctx.host = xstrdup(host);
3291 cctx.port = port;
3292 cctx.ai = cctx.aitop;
3293
3294 if ((sock = connect_next(&cctx)) == -1) {
3295 error("connect to %.100s port %d failed: %s",
3296 host, port, strerror(errno));
3297 channel_connect_ctx_free(&cctx);
3298 return NULL;
3299 }
3300 c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
3301 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
3302 c->connect_ctx = cctx;
3303 return c;
3304}
3305
3306Channel *
3307channel_connect_by_listen_address(u_short listen_port, char *ctype, char *rname)
3308{
3309 int i;
3310
3311 for (i = 0; i < num_permitted_opens; i++) {
3312 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tucker1338b9e2011-10-02 18:57:35 +11003313 port_match(permitted_opens[i].listen_port, listen_port)) {
Damien Millerbd740252008-05-19 15:37:09 +10003314 return connect_to(
3315 permitted_opens[i].host_to_connect,
3316 permitted_opens[i].port_to_connect, ctype, rname);
3317 }
3318 }
3319 error("WARNING: Server requests forwarding for unknown listen_port %d",
3320 listen_port);
3321 return NULL;
3322}
3323
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003324/* Check if connecting to that port is permitted and connect. */
Damien Millerbd740252008-05-19 15:37:09 +10003325Channel *
3326channel_connect_to(const char *host, u_short port, char *ctype, char *rname)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003327{
Damien Miller9b439df2006-07-24 14:04:00 +10003328 int i, permit, permit_adm = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003329
3330 permit = all_opens_permitted;
3331 if (!permit) {
3332 for (i = 0; i < num_permitted_opens; i++)
Darren Tuckere7066df2004-05-24 10:18:05 +10003333 if (permitted_opens[i].host_to_connect != NULL &&
Darren Tucker1338b9e2011-10-02 18:57:35 +11003334 port_match(permitted_opens[i].port_to_connect, port) &&
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003335 strcmp(permitted_opens[i].host_to_connect, host) == 0)
3336 permit = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003337 }
Damien Miller9b439df2006-07-24 14:04:00 +10003338
3339 if (num_adm_permitted_opens > 0) {
3340 permit_adm = 0;
3341 for (i = 0; i < num_adm_permitted_opens; i++)
3342 if (permitted_adm_opens[i].host_to_connect != NULL &&
Darren Tucker1338b9e2011-10-02 18:57:35 +11003343 port_match(permitted_adm_opens[i].port_to_connect, port) &&
Damien Miller9b439df2006-07-24 14:04:00 +10003344 strcmp(permitted_adm_opens[i].host_to_connect, host)
3345 == 0)
3346 permit_adm = 1;
3347 }
3348
3349 if (!permit || !permit_adm) {
Damien Miller996acd22003-04-09 20:59:48 +10003350 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003351 "but the request was denied.", host, port);
Damien Millerbd740252008-05-19 15:37:09 +10003352 return NULL;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003353 }
Damien Millerbd740252008-05-19 15:37:09 +10003354 return connect_to(host, port, ctype, rname);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003355}
3356
Damien Miller0e220db2004-06-15 10:34:08 +10003357void
3358channel_send_window_changes(void)
3359{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10003360 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10003361 struct winsize ws;
3362
3363 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11003364 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10003365 channels[i]->type != SSH_CHANNEL_OPEN)
3366 continue;
3367 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
3368 continue;
3369 channel_request_start(i, "window-change", 0);
Damien Miller71a73672006-03-26 14:04:36 +11003370 packet_put_int((u_int)ws.ws_col);
3371 packet_put_int((u_int)ws.ws_row);
3372 packet_put_int((u_int)ws.ws_xpixel);
3373 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10003374 packet_send();
3375 }
3376}
3377
Ben Lindstrome9c99912001-06-09 00:41:05 +00003378/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003379
Damien Miller5428f641999-11-25 11:54:57 +11003380/*
3381 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003382 * Returns 0 and a suitable display number for the DISPLAY variable
3383 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11003384 */
Kevin Steves366298c2001-12-19 17:58:01 +00003385int
Damien Miller95c249f2002-02-05 12:11:34 +11003386x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10003387 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003388{
Damien Millere7378562001-12-21 14:58:35 +11003389 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11003390 int display_number, sock;
3391 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11003392 struct addrinfo hints, *ai, *aitop;
3393 char strport[NI_MAXSERV];
3394 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003395
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003396 if (chanids == NULL)
3397 return -1;
3398
Damien Millera34a28b1999-12-14 10:47:15 +11003399 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11003400 display_number < MAX_DISPLAYS;
3401 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11003402 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11003403 memset(&hints, 0, sizeof(hints));
3404 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11003405 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11003406 hints.ai_socktype = SOCK_STREAM;
3407 snprintf(strport, sizeof strport, "%d", port);
3408 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003409 error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00003410 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003411 }
Damien Miller34132e52000-01-14 15:45:46 +11003412 for (ai = aitop; ai; ai = ai->ai_next) {
3413 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
3414 continue;
Darren Tucker7bd98e72010-01-10 10:31:12 +11003415 sock = socket(ai->ai_family, ai->ai_socktype,
3416 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003417 if (sock < 0) {
Damien Miller6480c632010-03-26 11:09:44 +11003418 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)
3419#ifdef EPFNOSUPPORT
3420 && (errno != EPFNOSUPPORT)
3421#endif
3422 ) {
Damien Millere2192732000-01-17 13:22:55 +11003423 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10003424 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00003425 return -1;
Damien Millere2192732000-01-17 13:22:55 +11003426 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11003427 debug("x11_create_display_inet: Socket family %d not supported",
3428 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11003429 continue;
3430 }
Damien Miller34132e52000-01-14 15:45:46 +11003431 }
Damien Miller04ee0f82009-11-18 17:48:30 +11003432 if (ai->ai_family == AF_INET6)
3433 sock_set_v6only(sock);
Damien Miller4401e452008-06-12 06:05:12 +10003434 if (x11_use_localhost)
3435 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11003436 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003437 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003438 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11003439
Damien Miller34132e52000-01-14 15:45:46 +11003440 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11003441 close(socks[n]);
3442 }
3443 num_socks = 0;
3444 break;
3445 }
3446 socks[num_socks++] = sock;
3447 if (num_socks == NUM_SOCKS)
3448 break;
Damien Miller95def091999-11-25 00:26:21 +11003449 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00003450 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11003451 if (num_socks > 0)
3452 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003453 }
Damien Miller95def091999-11-25 00:26:21 +11003454 if (display_number >= MAX_DISPLAYS) {
3455 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00003456 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003457 }
Damien Miller95def091999-11-25 00:26:21 +11003458 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11003459 for (n = 0; n < num_socks; n++) {
3460 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11003461 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11003462 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003463 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00003464 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11003465 }
Damien Miller95def091999-11-25 00:26:21 +11003466 }
Damien Miller34132e52000-01-14 15:45:46 +11003467
Damien Miller34132e52000-01-14 15:45:46 +11003468 /* Allocate a channel for each socket. */
Damien Miller07d86be2006-03-26 14:19:21 +11003469 *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
Damien Miller34132e52000-01-14 15:45:46 +11003470 for (n = 0; n < num_socks; n++) {
3471 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11003472 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10003473 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
3474 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003475 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11003476 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003477 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11003478 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003479 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003480
Kevin Steves366298c2001-12-19 17:58:01 +00003481 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003482 *display_numberp = display_number;
3483 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003484}
3485
Ben Lindstrombba81212001-06-25 05:01:22 +00003486static int
Damien Miller819dbb62009-01-21 16:46:26 +11003487connect_local_xsocket_path(const char *pathname)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003488{
Damien Miller95def091999-11-25 00:26:21 +11003489 int sock;
3490 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003491
Damien Miller3afe3752001-12-21 12:39:51 +11003492 sock = socket(AF_UNIX, SOCK_STREAM, 0);
3493 if (sock < 0)
3494 error("socket: %.100s", strerror(errno));
3495 memset(&addr, 0, sizeof(addr));
3496 addr.sun_family = AF_UNIX;
Damien Miller819dbb62009-01-21 16:46:26 +11003497 strlcpy(addr.sun_path, pathname, sizeof addr.sun_path);
Damien Miller90967402006-03-26 14:07:26 +11003498 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
Damien Miller3afe3752001-12-21 12:39:51 +11003499 return sock;
3500 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11003501 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
3502 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003503}
3504
Damien Miller819dbb62009-01-21 16:46:26 +11003505static int
3506connect_local_xsocket(u_int dnr)
3507{
3508 char buf[1024];
3509 snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr);
3510 return connect_local_xsocket_path(buf);
3511}
3512
Damien Millerbd483e72000-04-30 10:00:53 +10003513int
3514x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003515{
Damien Miller57c4e872006-03-31 23:11:07 +11003516 u_int display_number;
Damien Miller95def091999-11-25 00:26:21 +11003517 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10003518 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11003519 struct addrinfo hints, *ai, *aitop;
3520 char strport[NI_MAXSERV];
Damien Miller57c4e872006-03-31 23:11:07 +11003521 int gaierr, sock = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003522
Damien Miller95def091999-11-25 00:26:21 +11003523 /* Try to open a socket for the local X server. */
3524 display = getenv("DISPLAY");
3525 if (!display) {
3526 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10003527 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003528 }
Damien Miller5428f641999-11-25 11:54:57 +11003529 /*
3530 * Now we decode the value of the DISPLAY variable and make a
3531 * connection to the real X server.
3532 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003533
Damien Miller819dbb62009-01-21 16:46:26 +11003534 /* Check if the display is from launchd. */
3535#ifdef __APPLE__
3536 if (strncmp(display, "/tmp/launch", 11) == 0) {
3537 sock = connect_local_xsocket_path(display);
3538 if (sock < 0)
3539 return -1;
3540
3541 /* OK, we now have a connection to the display. */
3542 return sock;
3543 }
3544#endif
Damien Miller5428f641999-11-25 11:54:57 +11003545 /*
3546 * Check if it is a unix domain socket. Unix domain displays are in
3547 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
3548 */
Damien Miller95def091999-11-25 00:26:21 +11003549 if (strncmp(display, "unix:", 5) == 0 ||
3550 display[0] == ':') {
3551 /* Connect to the unix domain socket. */
Damien Miller57c4e872006-03-31 23:11:07 +11003552 if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003553 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003554 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003555 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003556 }
3557 /* Create a socket. */
3558 sock = connect_local_xsocket(display_number);
3559 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10003560 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003561
3562 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10003563 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003564 }
Damien Miller5428f641999-11-25 11:54:57 +11003565 /*
3566 * Connect to an inet socket. The DISPLAY value is supposedly
3567 * hostname:d[.s], where hostname may also be numeric IP address.
3568 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00003569 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11003570 cp = strchr(buf, ':');
3571 if (!cp) {
3572 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10003573 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003574 }
Damien Miller95def091999-11-25 00:26:21 +11003575 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11003576 /* buf now contains the host name. But first we parse the display number. */
Damien Miller57c4e872006-03-31 23:11:07 +11003577 if (sscanf(cp + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11003578 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11003579 display);
Damien Millerbd483e72000-04-30 10:00:53 +10003580 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003581 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003582
Damien Miller34132e52000-01-14 15:45:46 +11003583 /* Look up the host address */
3584 memset(&hints, 0, sizeof(hints));
3585 hints.ai_family = IPv4or6;
3586 hints.ai_socktype = SOCK_STREAM;
Damien Miller57c4e872006-03-31 23:11:07 +11003587 snprintf(strport, sizeof strport, "%u", 6000 + display_number);
Damien Miller34132e52000-01-14 15:45:46 +11003588 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003589 error("%.100s: unknown host. (%s)", buf,
3590 ssh_gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10003591 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003592 }
Damien Miller34132e52000-01-14 15:45:46 +11003593 for (ai = aitop; ai; ai = ai->ai_next) {
3594 /* Create a socket. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11003595 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003596 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003597 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10003598 continue;
3599 }
3600 /* Connect it to the display. */
3601 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Miller57c4e872006-03-31 23:11:07 +11003602 debug2("connect %.100s port %u: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10003603 6000 + display_number, strerror(errno));
3604 close(sock);
3605 continue;
3606 }
3607 /* Success */
3608 break;
Damien Miller34132e52000-01-14 15:45:46 +11003609 }
Damien Miller34132e52000-01-14 15:45:46 +11003610 freeaddrinfo(aitop);
3611 if (!ai) {
Damien Miller57c4e872006-03-31 23:11:07 +11003612 error("connect %.100s port %u: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11003613 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10003614 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003615 }
Damien Miller398e1cf2002-02-05 11:52:13 +11003616 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10003617 return sock;
3618}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003619
Damien Millerbd483e72000-04-30 10:00:53 +10003620/*
3621 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
3622 * the remote channel number. We should do whatever we want, and respond
3623 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
3624 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003625
Damien Miller8473dd82006-07-24 14:08:32 +10003626/* ARGSUSED */
Damien Millerbd483e72000-04-30 10:00:53 +10003627void
Damien Miller630d6f42002-01-22 23:17:30 +11003628x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10003629{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003630 Channel *c = NULL;
3631 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10003632 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10003633
3634 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003635
3636 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00003637
3638 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003639 remote_host = packet_get_string(NULL);
3640 } else {
3641 remote_host = xstrdup("unknown (remote did not supply name)");
3642 }
Damien Miller48b03fc2002-01-22 23:11:40 +11003643 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10003644
3645 /* Obtain a connection to the real X display. */
3646 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003647 if (sock != -1) {
3648 /* Allocate a channel for this connection. */
3649 c = channel_new("connected x11 socket",
3650 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
3651 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11003652 c->remote_id = remote_id;
3653 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003654 }
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003655 xfree(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003656 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10003657 /* Send refusal to the remote host. */
3658 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003659 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10003660 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10003661 /* Send a confirmation to the remote host. */
3662 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003663 packet_put_int(remote_id);
3664 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10003665 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00003666 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003667}
3668
Damien Miller69b69aa2000-10-28 14:19:58 +11003669/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
Damien Miller8473dd82006-07-24 14:08:32 +10003670/* ARGSUSED */
Damien Miller69b69aa2000-10-28 14:19:58 +11003671void
Damien Miller630d6f42002-01-22 23:17:30 +11003672deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11003673{
3674 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00003675
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00003676 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11003677 case SSH_SMSG_AGENT_OPEN:
3678 error("Warning: ssh server tried agent forwarding.");
3679 break;
3680 case SSH_SMSG_X11_OPEN:
3681 error("Warning: ssh server tried X11 forwarding.");
3682 break;
3683 default:
Damien Miller630d6f42002-01-22 23:17:30 +11003684 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11003685 break;
3686 }
Damien Miller5eb137c2005-12-31 16:19:53 +11003687 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11003688 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
3689 packet_put_int(rchan);
3690 packet_send();
3691}
3692
Damien Miller5428f641999-11-25 11:54:57 +11003693/*
3694 * Requests forwarding of X11 connections, generates fake authentication
3695 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00003696 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11003697 */
Damien Miller4af51302000-04-16 11:18:38 +10003698void
Damien Miller17e7ed02005-06-17 12:54:33 +10003699x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Miller6d7b4372011-06-23 08:31:57 +10003700 const char *proto, const char *data, int want_reply)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003701{
Ben Lindstrom46c16222000-12-22 01:43:59 +00003702 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10003703 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11003704 char *new_data;
3705 int screen_number;
3706 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10003707 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003708
Damien Millerf92c0792005-07-06 09:45:26 +10003709 if (x11_saved_display == NULL)
3710 x11_saved_display = xstrdup(disp);
3711 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10003712 error("x11_request_forwarding_with_spoofing: different "
3713 "$DISPLAY already forwarded");
3714 return;
3715 }
3716
Damien Millerd5fe0ba2006-08-30 11:07:39 +10003717 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11003718 if (cp)
3719 cp = strchr(cp, '.');
3720 if (cp)
Damien Miller08d61502006-03-26 14:28:32 +11003721 screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
Damien Miller95def091999-11-25 00:26:21 +11003722 else
3723 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003724
Damien Miller13390022005-07-06 09:44:19 +10003725 if (x11_saved_proto == NULL) {
3726 /* Save protocol name. */
3727 x11_saved_proto = xstrdup(proto);
3728 /*
Damien Miller46d38de2005-07-17 17:02:09 +10003729 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10003730 * of the same length.
3731 */
3732 x11_saved_data = xmalloc(data_len);
3733 x11_fake_data = xmalloc(data_len);
3734 for (i = 0; i < data_len; i++) {
3735 if (sscanf(data + 2 * i, "%2x", &value) != 1)
3736 fatal("x11_request_forwarding: bad "
3737 "authentication data: %.100s", data);
3738 if (i % 4 == 0)
3739 rnd = arc4random();
3740 x11_saved_data[i] = value;
3741 x11_fake_data[i] = rnd & 0xff;
3742 rnd >>= 8;
3743 }
3744 x11_saved_data_len = data_len;
3745 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11003746 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003747
Damien Miller95def091999-11-25 00:26:21 +11003748 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10003749 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003750
Damien Miller95def091999-11-25 00:26:21 +11003751 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10003752 if (compat20) {
Damien Miller6d7b4372011-06-23 08:31:57 +10003753 channel_request_start(client_session_id, "x11-req", want_reply);
Damien Millerbd483e72000-04-30 10:00:53 +10003754 packet_put_char(0); /* XXX bool single connection */
3755 } else {
3756 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
3757 }
3758 packet_put_cstring(proto);
3759 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11003760 packet_put_int(screen_number);
3761 packet_send();
3762 packet_write_wait();
3763 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003764}
3765
Ben Lindstrome9c99912001-06-09 00:41:05 +00003766
3767/* -- agent forwarding */
3768
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003769/* Sends a message to the server to request authentication fd forwarding. */
3770
Damien Miller4af51302000-04-16 11:18:38 +10003771void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003772auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003773{
Damien Miller95def091999-11-25 00:26:21 +11003774 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
3775 packet_send();
3776 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003777}