blob: 7ee1f98d005a58f2c7101d2eff4eeb0eed7b3509 [file] [log] [blame]
djm@openbsd.org95767262016-03-07 19:02:43 +00001/* $OpenBSD: channels.c,v 1.350 2016/03/07 19:02:43 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * This file contains functions for generic socket connection forwarding.
7 * There is also code for initiating connection forwarding for X11 connections,
8 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10009 *
Damien Millere4340be2000-09-16 13:29:08 +110010 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
15 *
Damien Miller33b13562000-04-04 14:38:59 +100016 * SSH2 support added by Markus Friedl.
Damien Millera90fc082002-01-22 23:19:38 +110017 * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110018 * Copyright (c) 1999 Dug Song. All rights reserved.
19 * Copyright (c) 1999 Theo de Raadt. All rights reserved.
20 *
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
23 * are met:
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110040 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100041
42#include "includes.h"
Damien Miller17e91c02006-03-15 11:28:34 +110043
Damien Miller574c41f2006-03-15 11:40:10 +110044#include <sys/types.h>
deraadt@openbsd.org087266e2015-01-20 23:14:00 +000045#include <sys/param.h> /* MIN MAX */
Damien Miller7acefbb2014-07-18 14:11:24 +100046#include <sys/stat.h>
Damien Millerd7834352006-08-05 12:39:39 +100047#include <sys/ioctl.h>
Damien Miller574c41f2006-03-15 11:40:10 +110048#include <sys/un.h>
Damien Millerefc04e72006-07-10 20:26:27 +100049#include <sys/socket.h>
Damien Miller9aec9192006-08-05 10:57:45 +100050#ifdef HAVE_SYS_TIME_H
51# include <sys/time.h>
52#endif
Damien Millerefc04e72006-07-10 20:26:27 +100053
54#include <netinet/in.h>
55#include <arpa/inet.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110056
Darren Tucker39972492006-07-12 22:22:46 +100057#include <errno.h>
Darren Tucker6e7fe1c2010-01-08 17:07:22 +110058#include <fcntl.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100059#include <netdb.h>
Darren Tucker37f92202015-02-23 03:07:24 +110060#ifdef HAVE_STDINT_H
millert@openbsd.orgfd368342015-02-06 23:21:59 +000061#include <stdint.h>
Darren Tucker37f92202015-02-23 03:07:24 +110062#endif
Damien Millera7a73ee2006-08-05 11:37:59 +100063#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100064#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100065#include <string.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110066#include <termios.h>
Damien Millere6b3b612006-07-24 14:01:23 +100067#include <unistd.h>
Damien Millerd7834352006-08-05 12:39:39 +100068#include <stdarg.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100069
Damien Millerb84886b2008-05-19 15:05:07 +100070#include "openbsd-compat/sys-queue.h"
Damien Millerd7834352006-08-05 12:39:39 +100071#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100072#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000073#include "ssh1.h"
74#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100075#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000076#include "log.h"
77#include "misc.h"
Damien Millerd7834352006-08-05 12:39:39 +100078#include "buffer.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079#include "channels.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100080#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000081#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100082#include "key.h"
83#include "authfd.h"
Damien Miller3afe3752001-12-21 12:39:51 +110084#include "pathnames.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100085
Ben Lindstrome9c99912001-06-09 00:41:05 +000086/* -- channel core */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100087
Damien Miller5428f641999-11-25 11:54:57 +110088/*
89 * Pointer to an array containing all allocated channels. The array is
90 * dynamically extended as needed.
91 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000092static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100093
Damien Miller5428f641999-11-25 11:54:57 +110094/*
95 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000096 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110097 */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +100098static u_int channels_alloc = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100099
Damien Miller5428f641999-11-25 11:54:57 +1100100/*
101 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000102 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +1100103 */
Damien Miller5e953212001-01-30 09:14:00 +1100104static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000105
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000106
Ben Lindstrome9c99912001-06-09 00:41:05 +0000107/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000108
Damien Miller5428f641999-11-25 11:54:57 +1100109/*
110 * Data structure for storing which hosts are permitted for forward requests.
111 * The local sides of any remote forwards are stored in this array to prevent
112 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
113 * network (which might be behind a firewall).
114 */
Damien Miller7acefbb2014-07-18 14:11:24 +1000115/* XXX: streamlocal wants a path instead of host:port */
116/* Overload host_to_connect; we could just make this match Forward */
117/* XXX - can we use listen_host instead of listen_path? */
Damien Miller95def091999-11-25 00:26:21 +1100118typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +1000119 char *host_to_connect; /* Connect to 'host'. */
Damien Miller7acefbb2014-07-18 14:11:24 +1000120 int port_to_connect; /* Connect to 'port'. */
Damien Miller4b3ed642014-07-02 15:29:40 +1000121 char *listen_host; /* Remote side should listen address. */
Damien Miller7acefbb2014-07-18 14:11:24 +1000122 char *listen_path; /* Remote side should listen path. */
123 int listen_port; /* Remote side should listen port. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000124} ForwardPermission;
125
Damien Miller9b439df2006-07-24 14:04:00 +1000126/* List of all permitted host/port pairs to connect by the user. */
Damien Miller232cfb12010-06-26 09:50:30 +1000127static ForwardPermission *permitted_opens = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000128
Damien Miller9b439df2006-07-24 14:04:00 +1000129/* List of all permitted host/port pairs to connect by the admin. */
Damien Miller232cfb12010-06-26 09:50:30 +1000130static ForwardPermission *permitted_adm_opens = NULL;
Damien Miller9b439df2006-07-24 14:04:00 +1000131
132/* Number of permitted host/port pairs in the array permitted by the user. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000133static int num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +1000134
135/* Number of permitted host/port pair in the array permitted by the admin. */
136static int num_adm_permitted_opens = 0;
137
Darren Tucker1338b9e2011-10-02 18:57:35 +1100138/* special-case port number meaning allow any port */
139#define FWD_PERMIT_ANY_PORT 0
140
Damien Miller5428f641999-11-25 11:54:57 +1100141/*
142 * If this is true, all opens are permitted. This is the case on the server
143 * on which we have to trust the client anyway, and the user could do
144 * anything after logging in anyway.
145 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000146static int all_opens_permitted = 0;
147
Ben Lindstrome9c99912001-06-09 00:41:05 +0000148
149/* -- X11 forwarding */
150
151/* Maximum number of fake X11 displays to try. */
152#define MAX_DISPLAYS 1000
153
Damien Miller13390022005-07-06 09:44:19 +1000154/* Saved X11 local (client) display. */
155static char *x11_saved_display = NULL;
156
Ben Lindstrome9c99912001-06-09 00:41:05 +0000157/* Saved X11 authentication protocol name. */
158static char *x11_saved_proto = NULL;
159
160/* Saved X11 authentication data. This is the real data. */
161static char *x11_saved_data = NULL;
162static u_int x11_saved_data_len = 0;
163
djm@openbsd.org1bf477d2015-07-01 02:26:31 +0000164/* Deadline after which all X11 connections are refused */
165static u_int x11_refuse_time;
166
Ben Lindstrome9c99912001-06-09 00:41:05 +0000167/*
168 * Fake X11 authentication data. This is what the server will be sending us;
169 * we should replace any occurrences of this by the real data.
170 */
Damien Miller4ae97f12006-03-26 14:08:10 +1100171static u_char *x11_fake_data = NULL;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000172static u_int x11_fake_data_len;
173
174
175/* -- agent forwarding */
176
177#define NUM_SOCKS 10
178
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000179/* AF_UNSPEC or AF_INET or AF_INET6 */
Ben Lindstrom908afed2001-10-03 17:34:59 +0000180static int IPv4or6 = AF_UNSPEC;
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000181
Ben Lindstrome9c99912001-06-09 00:41:05 +0000182/* helper */
Ben Lindstrombba81212001-06-25 05:01:22 +0000183static void port_open_helper(Channel *c, char *rtype);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000184
Damien Millerbd740252008-05-19 15:37:09 +1000185/* non-blocking connect helpers */
186static int connect_next(struct channel_connect *);
187static void channel_connect_ctx_free(struct channel_connect *);
188
Ben Lindstrome9c99912001-06-09 00:41:05 +0000189/* -- channel core */
Damien Millerb38eff82000-04-01 11:09:21 +1000190
191Channel *
Damien Millerd47c62a2005-12-13 19:33:57 +1100192channel_by_id(int id)
Damien Millerb38eff82000-04-01 11:09:21 +1000193{
194 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000195
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000196 if (id < 0 || (u_int)id >= channels_alloc) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100197 logit("channel_by_id: %d: bad id", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000198 return NULL;
199 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000200 c = channels[id];
201 if (c == NULL) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100202 logit("channel_by_id: %d: bad id: channel free", id);
Damien Millerb38eff82000-04-01 11:09:21 +1000203 return NULL;
204 }
205 return c;
206}
207
Damien Miller5428f641999-11-25 11:54:57 +1100208/*
Damien Millerd47c62a2005-12-13 19:33:57 +1100209 * Returns the channel if it is allowed to receive protocol messages.
210 * Private channels, like listening sockets, may not receive messages.
211 */
212Channel *
213channel_lookup(int id)
214{
215 Channel *c;
216
217 if ((c = channel_by_id(id)) == NULL)
218 return (NULL);
219
Damien Millerd62f2ca2006-03-26 13:57:41 +1100220 switch (c->type) {
Damien Millerd47c62a2005-12-13 19:33:57 +1100221 case SSH_CHANNEL_X11_OPEN:
222 case SSH_CHANNEL_LARVAL:
223 case SSH_CHANNEL_CONNECTING:
224 case SSH_CHANNEL_DYNAMIC:
225 case SSH_CHANNEL_OPENING:
226 case SSH_CHANNEL_OPEN:
227 case SSH_CHANNEL_INPUT_DRAINING:
228 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller36187092013-06-10 13:07:11 +1000229 case SSH_CHANNEL_ABANDONED:
Damien Millerd47c62a2005-12-13 19:33:57 +1100230 return (c);
Damien Millerd47c62a2005-12-13 19:33:57 +1100231 }
232 logit("Non-public channel %d, type %d.", id, c->type);
233 return (NULL);
234}
235
236/*
Damien Millere247cc42000-05-07 12:03:14 +1000237 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000238 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100239 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000240static void
Damien Miller69b69aa2000-10-28 14:19:58 +1100241channel_register_fds(Channel *c, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000242 int extusage, int nonblock, int is_tty)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000243{
Damien Miller95def091999-11-25 00:26:21 +1100244 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100245 channel_max_fd = MAX(channel_max_fd, rfd);
246 channel_max_fd = MAX(channel_max_fd, wfd);
247 channel_max_fd = MAX(channel_max_fd, efd);
248
Darren Tucker6e7fe1c2010-01-08 17:07:22 +1100249 if (rfd != -1)
250 fcntl(rfd, F_SETFD, FD_CLOEXEC);
251 if (wfd != -1 && wfd != rfd)
252 fcntl(wfd, F_SETFD, FD_CLOEXEC);
253 if (efd != -1 && efd != rfd && efd != wfd)
254 fcntl(efd, F_SETFD, FD_CLOEXEC);
Damien Millere247cc42000-05-07 12:03:14 +1000255
Damien Miller6f83b8e2000-05-02 09:23:45 +1000256 c->rfd = rfd;
257 c->wfd = wfd;
258 c->sock = (rfd == wfd) ? rfd : -1;
259 c->efd = efd;
260 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100261
Darren Tuckered3cdc02008-06-16 23:29:18 +1000262 if ((c->isatty = is_tty) != 0)
Damien Millerfbdeece2003-09-02 22:52:31 +1000263 debug2("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Millerc192a4c2013-08-01 14:29:20 +1000264#ifdef _AIX
265 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker1a48aec2008-06-16 23:35:56 +1000266 c->wfd_isatty = is_tty || isatty(c->wfd);
Damien Millerc192a4c2013-08-01 14:29:20 +1000267#endif
Damien Miller79438cc2001-02-16 12:34:57 +1100268
Damien Miller69b69aa2000-10-28 14:19:58 +1100269 /* enable nonblocking mode */
270 if (nonblock) {
271 if (rfd != -1)
272 set_nonblock(rfd);
273 if (wfd != -1)
274 set_nonblock(wfd);
275 if (efd != -1)
276 set_nonblock(efd);
277 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000278}
279
280/*
281 * Allocate a new channel object and set its type and socket. This will cause
282 * remote_name to be freed.
283 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000284Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000285channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Ben Lindstrom4fed2be2002-06-25 23:17:36 +0000286 u_int window, u_int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000287{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000288 int found;
289 u_int i;
Damien Miller6f83b8e2000-05-02 09:23:45 +1000290 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000291
Damien Miller95def091999-11-25 00:26:21 +1100292 /* Do initial allocation if this is the first call. */
293 if (channels_alloc == 0) {
294 channels_alloc = 10;
Damien Miller07d86be2006-03-26 14:19:21 +1100295 channels = xcalloc(channels_alloc, sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100296 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000297 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100298 }
299 /* Try to find a free slot where to put the new channel. */
300 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000301 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100302 /* Found a free slot. */
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000303 found = (int)i;
Damien Miller95def091999-11-25 00:26:21 +1100304 break;
305 }
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000306 if (found < 0) {
Damien Miller5428f641999-11-25 11:54:57 +1100307 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100308 found = channels_alloc;
Damien Miller9403aa22002-06-26 19:14:43 +1000309 if (channels_alloc > 10000)
310 fatal("channel_new: internal error: channels_alloc %d "
311 "too big.", channels_alloc);
deraadt@openbsd.org657a5fb2015-04-24 01:36:00 +0000312 channels = xreallocarray(channels, channels_alloc + 10,
Damien Miller36812092006-03-26 14:22:47 +1100313 sizeof(Channel *));
Damien Miller5efcecc2003-09-17 07:31:14 +1000314 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100315 debug2("channel: expanding %d", channels_alloc);
Damien Miller95def091999-11-25 00:26:21 +1100316 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000317 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100318 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000319 /* Initialize and return new channel. */
Damien Miller07d86be2006-03-26 14:19:21 +1100320 c = channels[found] = xcalloc(1, sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100321 buffer_init(&c->input);
322 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000323 buffer_init(&c->extended);
Damien Millera1c1b6c2009-01-28 16:29:49 +1100324 c->path = NULL;
Damien Millerf6dff7c2011-09-22 21:38:52 +1000325 c->listening_addr = NULL;
326 c->listening_port = 0;
Damien Miller5144df92002-01-22 23:28:45 +1100327 c->ostate = CHAN_OUTPUT_OPEN;
328 c->istate = CHAN_INPUT_OPEN;
329 c->flags = 0;
Damien Millerd310d512008-06-16 07:59:23 +1000330 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, 0);
Damien Millera6508752012-04-22 11:21:10 +1000331 c->notbefore = 0;
Damien Miller95def091999-11-25 00:26:21 +1100332 c->self = found;
333 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000334 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000335 c->local_window = window;
336 c->local_window_max = window;
337 c->local_consumed = 0;
338 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100339 c->remote_id = -1;
Damien Millerb1ca8bb2003-05-14 13:45:42 +1000340 c->remote_name = xstrdup(remote_name);
Damien Millerb38eff82000-04-01 11:09:21 +1000341 c->remote_window = 0;
342 c->remote_maxpacket = 0;
Ben Lindstrom944c4f02001-09-18 05:51:13 +0000343 c->force_drain = 0;
Damien Millere7378562001-12-21 14:58:35 +1100344 c->single_connection = 0;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000345 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100346 c->detach_close = 0;
Damien Millerb84886b2008-05-19 15:05:07 +1000347 c->open_confirm = NULL;
348 c->open_confirm_ctx = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000349 c->input_filter = NULL;
Damien Miller077b2382005-12-31 16:22:32 +1100350 c->output_filter = NULL;
Darren Tucker84c56f52008-06-13 04:55:46 +1000351 c->filter_ctx = NULL;
352 c->filter_cleanup = NULL;
Damien Millere1537f92010-01-26 13:26:22 +1100353 c->ctl_chan = -1;
354 c->mux_rcb = NULL;
355 c->mux_ctx = NULL;
Damien Millerd530f5f2010-05-21 14:57:10 +1000356 c->mux_pause = 0;
Darren Tucker876045b2010-01-08 17:08:00 +1100357 c->delayed = 1; /* prevent call to channel_post handler */
Damien Millerb84886b2008-05-19 15:05:07 +1000358 TAILQ_INIT(&c->status_confirms);
Damien Miller95def091999-11-25 00:26:21 +1100359 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000360 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000361}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000362
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000363static int
364channel_find_maxfd(void)
365{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000366 u_int i;
367 int max = 0;
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000368 Channel *c;
369
370 for (i = 0; i < channels_alloc; i++) {
371 c = channels[i];
372 if (c != NULL) {
373 max = MAX(max, c->rfd);
374 max = MAX(max, c->wfd);
375 max = MAX(max, c->efd);
376 }
377 }
378 return max;
379}
380
381int
382channel_close_fd(int *fdp)
383{
384 int ret = 0, fd = *fdp;
385
386 if (fd != -1) {
387 ret = close(fd);
388 *fdp = -1;
389 if (fd == channel_max_fd)
390 channel_max_fd = channel_find_maxfd();
391 }
392 return ret;
393}
394
Damien Miller6f83b8e2000-05-02 09:23:45 +1000395/* Close all channel fd/socket. */
Ben Lindstrombba81212001-06-25 05:01:22 +0000396static void
Damien Miller6f83b8e2000-05-02 09:23:45 +1000397channel_close_fds(Channel *c)
398{
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000399 channel_close_fd(&c->sock);
400 channel_close_fd(&c->rfd);
401 channel_close_fd(&c->wfd);
402 channel_close_fd(&c->efd);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000403}
404
405/* Free the channel and close its fd/socket. */
Damien Miller4af51302000-04-16 11:18:38 +1000406void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000407channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000408{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000409 char *s;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000410 u_int i, n;
Damien Millerb84886b2008-05-19 15:05:07 +1000411 struct channel_confirm *cc;
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000412
413 for (n = 0, i = 0; i < channels_alloc; i++)
414 if (channels[i])
415 n++;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000416 debug("channel %d: free: %s, nchannels %u", c->self,
Ben Lindstromc0dee1a2001-06-05 20:52:50 +0000417 c->remote_name ? c->remote_name : "???", n);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000418
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000419 s = channel_open_message();
Damien Millerfbdeece2003-09-02 22:52:31 +1000420 debug3("channel %d: status: %s", c->self, s);
Darren Tuckera627d422013-06-02 07:31:17 +1000421 free(s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000422
Damien Miller6f83b8e2000-05-02 09:23:45 +1000423 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000424 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000425 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000426 buffer_free(&c->input);
427 buffer_free(&c->output);
428 buffer_free(&c->extended);
Darren Tuckera627d422013-06-02 07:31:17 +1000429 free(c->remote_name);
430 c->remote_name = NULL;
431 free(c->path);
432 c->path = NULL;
433 free(c->listening_addr);
434 c->listening_addr = NULL;
Damien Millerb84886b2008-05-19 15:05:07 +1000435 while ((cc = TAILQ_FIRST(&c->status_confirms)) != NULL) {
436 if (cc->abandon_cb != NULL)
437 cc->abandon_cb(c, cc->ctx);
438 TAILQ_REMOVE(&c->status_confirms, cc, entry);
Damien Miller1d2c4562014-02-04 11:18:20 +1100439 explicit_bzero(cc, sizeof(*cc));
Darren Tuckera627d422013-06-02 07:31:17 +1000440 free(cc);
Damien Millerb84886b2008-05-19 15:05:07 +1000441 }
Darren Tucker84c56f52008-06-13 04:55:46 +1000442 if (c->filter_cleanup != NULL && c->filter_ctx != NULL)
443 c->filter_cleanup(c->self, c->filter_ctx);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000444 channels[c->self] = NULL;
Darren Tuckera627d422013-06-02 07:31:17 +1000445 free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000446}
447
Ben Lindstrome9c99912001-06-09 00:41:05 +0000448void
Ben Lindstrom601e4362001-06-21 03:19:23 +0000449channel_free_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000450{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000451 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000452
Ben Lindstrom601e4362001-06-21 03:19:23 +0000453 for (i = 0; i < channels_alloc; i++)
454 if (channels[i] != NULL)
455 channel_free(channels[i]);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000456}
457
458/*
459 * Closes the sockets/fds of all channels. This is used to close extra file
460 * descriptors after a fork.
461 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000462void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000463channel_close_all(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000464{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000465 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000466
467 for (i = 0; i < channels_alloc; i++)
468 if (channels[i] != NULL)
469 channel_close_fds(channels[i]);
470}
471
472/*
Ben Lindstrom809744e2001-07-04 05:26:06 +0000473 * Stop listening to channels.
474 */
Ben Lindstrom809744e2001-07-04 05:26:06 +0000475void
476channel_stop_listening(void)
477{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000478 u_int i;
Ben Lindstrom809744e2001-07-04 05:26:06 +0000479 Channel *c;
480
481 for (i = 0; i < channels_alloc; i++) {
482 c = channels[i];
483 if (c != NULL) {
484 switch (c->type) {
485 case SSH_CHANNEL_AUTH_SOCKET:
486 case SSH_CHANNEL_PORT_LISTENER:
487 case SSH_CHANNEL_RPORT_LISTENER:
488 case SSH_CHANNEL_X11_LISTENER:
Damien Miller7acefbb2014-07-18 14:11:24 +1000489 case SSH_CHANNEL_UNIX_LISTENER:
490 case SSH_CHANNEL_RUNIX_LISTENER:
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000491 channel_close_fd(&c->sock);
Ben Lindstrom809744e2001-07-04 05:26:06 +0000492 channel_free(c);
493 break;
494 }
495 }
496 }
497}
498
499/*
Ben Lindstrome9c99912001-06-09 00:41:05 +0000500 * Returns true if no channel has too much buffered data, and false if one or
501 * more channel is overfull.
502 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000503int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000504channel_not_very_much_buffered_data(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000505{
506 u_int i;
507 Channel *c;
508
509 for (i = 0; i < channels_alloc; i++) {
510 c = channels[i];
511 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000512#if 0
513 if (!compat20 &&
514 buffer_len(&c->input) > packet_get_maxsize()) {
Damien Miller275295e2003-01-08 14:04:09 +1100515 debug2("channel %d: big input buffer %d",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000516 c->self, buffer_len(&c->input));
517 return 0;
518 }
Damien Milleraf5f2e62001-10-10 15:01:16 +1000519#endif
Ben Lindstrome9c99912001-06-09 00:41:05 +0000520 if (buffer_len(&c->output) > packet_get_maxsize()) {
Darren Tucker502d3842003-06-28 12:38:01 +1000521 debug2("channel %d: big output buffer %u > %u",
Damien Milleraf5f2e62001-10-10 15:01:16 +1000522 c->self, buffer_len(&c->output),
523 packet_get_maxsize());
Ben Lindstrome9c99912001-06-09 00:41:05 +0000524 return 0;
525 }
526 }
527 }
528 return 1;
529}
530
531/* Returns true if any channel is still open. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000532int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000533channel_still_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000534{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000535 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000536 Channel *c;
537
538 for (i = 0; i < channels_alloc; i++) {
539 c = channels[i];
540 if (c == NULL)
541 continue;
542 switch (c->type) {
543 case SSH_CHANNEL_X11_LISTENER:
544 case SSH_CHANNEL_PORT_LISTENER:
545 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100546 case SSH_CHANNEL_MUX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000547 case SSH_CHANNEL_CLOSED:
548 case SSH_CHANNEL_AUTH_SOCKET:
549 case SSH_CHANNEL_DYNAMIC:
550 case SSH_CHANNEL_CONNECTING:
551 case SSH_CHANNEL_ZOMBIE:
Damien Miller36187092013-06-10 13:07:11 +1000552 case SSH_CHANNEL_ABANDONED:
Damien Miller7acefbb2014-07-18 14:11:24 +1000553 case SSH_CHANNEL_UNIX_LISTENER:
554 case SSH_CHANNEL_RUNIX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000555 continue;
556 case SSH_CHANNEL_LARVAL:
557 if (!compat20)
558 fatal("cannot happen: SSH_CHANNEL_LARVAL");
559 continue;
560 case SSH_CHANNEL_OPENING:
561 case SSH_CHANNEL_OPEN:
562 case SSH_CHANNEL_X11_OPEN:
Damien Millere1537f92010-01-26 13:26:22 +1100563 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000564 return 1;
565 case SSH_CHANNEL_INPUT_DRAINING:
566 case SSH_CHANNEL_OUTPUT_DRAINING:
567 if (!compat13)
568 fatal("cannot happen: OUT_DRAIN");
569 return 1;
570 default:
571 fatal("channel_still_open: bad channel type %d", c->type);
572 /* NOTREACHED */
573 }
574 }
575 return 0;
576}
577
578/* Returns the id of an open channel suitable for keepaliving */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000579int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000580channel_find_open(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000581{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000582 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000583 Channel *c;
584
585 for (i = 0; i < channels_alloc; i++) {
586 c = channels[i];
Damien Miller3bbd8782004-06-18 22:23:22 +1000587 if (c == NULL || c->remote_id < 0)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000588 continue;
589 switch (c->type) {
590 case SSH_CHANNEL_CLOSED:
591 case SSH_CHANNEL_DYNAMIC:
592 case SSH_CHANNEL_X11_LISTENER:
593 case SSH_CHANNEL_PORT_LISTENER:
594 case SSH_CHANNEL_RPORT_LISTENER:
Damien Millere1537f92010-01-26 13:26:22 +1100595 case SSH_CHANNEL_MUX_LISTENER:
596 case SSH_CHANNEL_MUX_CLIENT:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000597 case SSH_CHANNEL_OPENING:
598 case SSH_CHANNEL_CONNECTING:
599 case SSH_CHANNEL_ZOMBIE:
Damien Miller36187092013-06-10 13:07:11 +1000600 case SSH_CHANNEL_ABANDONED:
Damien Miller7acefbb2014-07-18 14:11:24 +1000601 case SSH_CHANNEL_UNIX_LISTENER:
602 case SSH_CHANNEL_RUNIX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000603 continue;
604 case SSH_CHANNEL_LARVAL:
605 case SSH_CHANNEL_AUTH_SOCKET:
606 case SSH_CHANNEL_OPEN:
607 case SSH_CHANNEL_X11_OPEN:
608 return i;
609 case SSH_CHANNEL_INPUT_DRAINING:
610 case SSH_CHANNEL_OUTPUT_DRAINING:
611 if (!compat13)
612 fatal("cannot happen: OUT_DRAIN");
613 return i;
614 default:
615 fatal("channel_find_open: bad channel type %d", c->type);
616 /* NOTREACHED */
617 }
618 }
619 return -1;
620}
621
622
623/*
624 * Returns a message describing the currently open forwarded connections,
625 * suitable for sending to the client. The message contains crlf pairs for
626 * newlines.
627 */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000628char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000629channel_open_message(void)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000630{
631 Buffer buffer;
632 Channel *c;
633 char buf[1024], *cp;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000634 u_int i;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000635
636 buffer_init(&buffer);
637 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
638 buffer_append(&buffer, buf, strlen(buf));
639 for (i = 0; i < channels_alloc; i++) {
640 c = channels[i];
641 if (c == NULL)
642 continue;
643 switch (c->type) {
644 case SSH_CHANNEL_X11_LISTENER:
645 case SSH_CHANNEL_PORT_LISTENER:
646 case SSH_CHANNEL_RPORT_LISTENER:
647 case SSH_CHANNEL_CLOSED:
648 case SSH_CHANNEL_AUTH_SOCKET:
649 case SSH_CHANNEL_ZOMBIE:
Damien Miller36187092013-06-10 13:07:11 +1000650 case SSH_CHANNEL_ABANDONED:
Damien Millere1537f92010-01-26 13:26:22 +1100651 case SSH_CHANNEL_MUX_CLIENT:
652 case SSH_CHANNEL_MUX_LISTENER:
Damien Miller7acefbb2014-07-18 14:11:24 +1000653 case SSH_CHANNEL_UNIX_LISTENER:
654 case SSH_CHANNEL_RUNIX_LISTENER:
Ben Lindstrome9c99912001-06-09 00:41:05 +0000655 continue;
656 case SSH_CHANNEL_LARVAL:
657 case SSH_CHANNEL_OPENING:
658 case SSH_CHANNEL_CONNECTING:
659 case SSH_CHANNEL_DYNAMIC:
660 case SSH_CHANNEL_OPEN:
661 case SSH_CHANNEL_X11_OPEN:
662 case SSH_CHANNEL_INPUT_DRAINING:
663 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Miller0e220db2004-06-15 10:34:08 +1000664 snprintf(buf, sizeof buf,
djm@openbsd.orgb1d38a32015-10-15 23:51:40 +0000665 " #%d %.300s (t%d r%d i%u/%d o%u/%d fd %d/%d cc %d)\r\n",
Ben Lindstrome9c99912001-06-09 00:41:05 +0000666 c->self, c->remote_name,
667 c->type, c->remote_id,
668 c->istate, buffer_len(&c->input),
669 c->ostate, buffer_len(&c->output),
Damien Millere1537f92010-01-26 13:26:22 +1100670 c->rfd, c->wfd, c->ctl_chan);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000671 buffer_append(&buffer, buf, strlen(buf));
672 continue;
673 default:
674 fatal("channel_open_message: bad channel type %d", c->type);
675 /* NOTREACHED */
676 }
677 }
678 buffer_append(&buffer, "\0", 1);
djm@openbsd.orgbb005dc2014-10-08 22:15:06 +0000679 cp = xstrdup((char *)buffer_ptr(&buffer));
Ben Lindstrome9c99912001-06-09 00:41:05 +0000680 buffer_free(&buffer);
681 return cp;
682}
683
684void
685channel_send_open(int id)
686{
687 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000688
Ben Lindstrome9c99912001-06-09 00:41:05 +0000689 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000690 logit("channel_send_open: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000691 return;
692 }
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000693 debug2("channel %d: send open", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000694 packet_start(SSH2_MSG_CHANNEL_OPEN);
695 packet_put_cstring(c->ctype);
696 packet_put_int(c->self);
697 packet_put_int(c->local_window);
698 packet_put_int(c->local_maxpacket);
699 packet_send();
700}
701
702void
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000703channel_request_start(int id, char *service, int wantconfirm)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000704{
Ben Lindstrom1d568f92002-12-23 02:44:36 +0000705 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000706
Ben Lindstrome9c99912001-06-09 00:41:05 +0000707 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000708 logit("channel_request_start: %d: unknown channel id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000709 return;
710 }
Damien Miller0e220db2004-06-15 10:34:08 +1000711 debug2("channel %d: request %s confirm %d", id, service, wantconfirm);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000712 packet_start(SSH2_MSG_CHANNEL_REQUEST);
713 packet_put_int(c->remote_id);
714 packet_put_cstring(service);
715 packet_put_char(wantconfirm);
716}
Damien Miller4f7becb2006-03-26 14:10:14 +1100717
Ben Lindstrome9c99912001-06-09 00:41:05 +0000718void
Damien Millerb84886b2008-05-19 15:05:07 +1000719channel_register_status_confirm(int id, channel_confirm_cb *cb,
720 channel_confirm_abandon_cb *abandon_cb, void *ctx)
721{
722 struct channel_confirm *cc;
723 Channel *c;
724
725 if ((c = channel_lookup(id)) == NULL)
726 fatal("channel_register_expect: %d: bad id", id);
727
Damien Miller6c81fee2013-11-08 12:19:55 +1100728 cc = xcalloc(1, sizeof(*cc));
Damien Millerb84886b2008-05-19 15:05:07 +1000729 cc->cb = cb;
730 cc->abandon_cb = abandon_cb;
731 cc->ctx = ctx;
732 TAILQ_INSERT_TAIL(&c->status_confirms, cc, entry);
733}
734
735void
Damien Millerd530f5f2010-05-21 14:57:10 +1000736channel_register_open_confirm(int id, channel_open_fn *fn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000737{
738 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000739
Ben Lindstrome9c99912001-06-09 00:41:05 +0000740 if (c == NULL) {
Damien Millera0094332008-11-03 19:26:35 +1100741 logit("channel_register_open_confirm: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000742 return;
743 }
Damien Millerb84886b2008-05-19 15:05:07 +1000744 c->open_confirm = fn;
745 c->open_confirm_ctx = ctx;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000746}
Damien Miller4f7becb2006-03-26 14:10:14 +1100747
Ben Lindstrome9c99912001-06-09 00:41:05 +0000748void
Damien Miller39eda6e2005-11-05 14:52:50 +1100749channel_register_cleanup(int id, channel_callback_fn *fn, int do_close)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000750{
Damien Millerd47c62a2005-12-13 19:33:57 +1100751 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000752
Ben Lindstrome9c99912001-06-09 00:41:05 +0000753 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000754 logit("channel_register_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000755 return;
756 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000757 c->detach_user = fn;
Damien Miller39eda6e2005-11-05 14:52:50 +1100758 c->detach_close = do_close;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000759}
Damien Miller4f7becb2006-03-26 14:10:14 +1100760
Ben Lindstrome9c99912001-06-09 00:41:05 +0000761void
762channel_cancel_cleanup(int id)
763{
Damien Millerd47c62a2005-12-13 19:33:57 +1100764 Channel *c = channel_by_id(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000765
Ben Lindstrome9c99912001-06-09 00:41:05 +0000766 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000767 logit("channel_cancel_cleanup: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000768 return;
769 }
Ben Lindstrom809744e2001-07-04 05:26:06 +0000770 c->detach_user = NULL;
Damien Miller39eda6e2005-11-05 14:52:50 +1100771 c->detach_close = 0;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000772}
Damien Miller4f7becb2006-03-26 14:10:14 +1100773
Ben Lindstrome9c99912001-06-09 00:41:05 +0000774void
Damien Miller077b2382005-12-31 16:22:32 +1100775channel_register_filter(int id, channel_infilter_fn *ifn,
Darren Tucker84c56f52008-06-13 04:55:46 +1000776 channel_outfilter_fn *ofn, channel_filter_cleanup_fn *cfn, void *ctx)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000777{
778 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000779
Ben Lindstrome9c99912001-06-09 00:41:05 +0000780 if (c == NULL) {
Damien Miller996acd22003-04-09 20:59:48 +1000781 logit("channel_register_filter: %d: bad id", id);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000782 return;
783 }
Damien Miller077b2382005-12-31 16:22:32 +1100784 c->input_filter = ifn;
785 c->output_filter = ofn;
Darren Tucker2fb66ca2008-06-13 04:49:33 +1000786 c->filter_ctx = ctx;
Darren Tucker84c56f52008-06-13 04:55:46 +1000787 c->filter_cleanup = cfn;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000788}
789
790void
791channel_set_fds(int id, int rfd, int wfd, int efd,
Darren Tuckered3cdc02008-06-16 23:29:18 +1000792 int extusage, int nonblock, int is_tty, u_int window_max)
Ben Lindstrome9c99912001-06-09 00:41:05 +0000793{
794 Channel *c = channel_lookup(id);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000795
Ben Lindstrome9c99912001-06-09 00:41:05 +0000796 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
797 fatal("channel_activate for non-larval channel %d.", id);
Darren Tuckered3cdc02008-06-16 23:29:18 +1000798 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock, is_tty);
Ben Lindstrome9c99912001-06-09 00:41:05 +0000799 c->type = SSH_CHANNEL_OPEN;
Damien Miller2aa0c192002-02-19 15:20:08 +1100800 c->local_window = c->local_window_max = window_max;
Ben Lindstrome9c99912001-06-09 00:41:05 +0000801 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
802 packet_put_int(c->remote_id);
803 packet_put_int(c->local_window);
804 packet_send();
805}
806
Damien Miller5428f641999-11-25 11:54:57 +1100807/*
Damien Millerb38eff82000-04-01 11:09:21 +1000808 * 'channel_pre*' are called just before select() to add any bits relevant to
809 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100810 */
Damien Millerb38eff82000-04-01 11:09:21 +1000811/*
812 * 'channel_post*': perform any appropriate operations for channels which
813 * have events pending.
814 */
Damien Millerd62f2ca2006-03-26 13:57:41 +1100815typedef void chan_fn(Channel *c, fd_set *readset, fd_set *writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000816chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
817chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
818
Damien Miller8473dd82006-07-24 14:08:32 +1000819/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000820static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100821channel_pre_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000822{
823 FD_SET(c->sock, readset);
824}
825
Damien Miller8473dd82006-07-24 14:08:32 +1000826/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000827static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100828channel_pre_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000829{
830 debug3("channel %d: waiting for connection", c->self);
831 FD_SET(c->sock, writeset);
832}
833
Ben Lindstrombba81212001-06-25 05:01:22 +0000834static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100835channel_pre_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000836{
837 if (buffer_len(&c->input) < packet_get_maxsize())
838 FD_SET(c->sock, readset);
839 if (buffer_len(&c->output) > 0)
840 FD_SET(c->sock, writeset);
841}
842
Ben Lindstrombba81212001-06-25 05:01:22 +0000843static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100844channel_pre_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000845{
Damien Millerde6987c2002-01-22 23:20:40 +1100846 u_int limit = compat20 ? c->remote_window : packet_get_maxsize();
Damien Millerb38eff82000-04-01 11:09:21 +1000847
Damien Miller33b13562000-04-04 14:38:59 +1000848 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerde6987c2002-01-22 23:20:40 +1100849 limit > 0 &&
Damien Miller499a0d52006-04-23 12:06:03 +1000850 buffer_len(&c->input) < limit &&
851 buffer_check_alloc(&c->input, CHAN_RBUF))
Damien Miller33b13562000-04-04 14:38:59 +1000852 FD_SET(c->rfd, readset);
853 if (c->ostate == CHAN_OUTPUT_OPEN ||
854 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
855 if (buffer_len(&c->output) > 0) {
856 FD_SET(c->wfd, writeset);
857 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
Ben Lindstromcf159442002-03-26 03:26:24 +0000858 if (CHANNEL_EFD_OUTPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +1000859 debug2("channel %d: obuf_empty delayed efd %d/(%d)",
860 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +0000861 else
862 chan_obuf_empty(c);
Damien Miller33b13562000-04-04 14:38:59 +1000863 }
864 }
865 /** XXX check close conditions, too */
Damien Millerd654dd22008-05-19 16:05:41 +1000866 if (compat20 && c->efd != -1 &&
867 !(c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED)) {
Damien Miller33b13562000-04-04 14:38:59 +1000868 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
869 buffer_len(&c->extended) > 0)
870 FD_SET(c->efd, writeset);
Damien Miller8853ca52010-06-26 10:00:14 +1000871 else if (c->efd != -1 && !(c->flags & CHAN_EOF_SENT) &&
872 (c->extended_usage == CHAN_EXTENDED_READ ||
873 c->extended_usage == CHAN_EXTENDED_IGNORE) &&
Damien Miller33b13562000-04-04 14:38:59 +1000874 buffer_len(&c->extended) < c->remote_window)
875 FD_SET(c->efd, readset);
876 }
Damien Miller0e220db2004-06-15 10:34:08 +1000877 /* XXX: What about efd? races? */
Damien Miller33b13562000-04-04 14:38:59 +1000878}
879
Damien Miller8473dd82006-07-24 14:08:32 +1000880/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000881static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100882channel_pre_input_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000883{
884 if (buffer_len(&c->input) == 0) {
885 packet_start(SSH_MSG_CHANNEL_CLOSE);
886 packet_put_int(c->remote_id);
887 packet_send();
888 c->type = SSH_CHANNEL_CLOSED;
Damien Millerfbdeece2003-09-02 22:52:31 +1000889 debug2("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000890 }
891}
892
Damien Miller8473dd82006-07-24 14:08:32 +1000893/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +0000894static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100895channel_pre_output_draining(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000896{
897 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000898 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000899 else
Damien Millerb38eff82000-04-01 11:09:21 +1000900 FD_SET(c->sock, writeset);
901}
902
903/*
904 * This is a special state for X11 authentication spoofing. An opened X11
905 * connection (when authentication spoofing is being done) remains in this
906 * state until the first packet has been completely read. The authentication
907 * data in that packet is then substituted by the real data if it matches the
908 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000909 * XXX All this happens at the client side.
Ben Lindstrome9c99912001-06-09 00:41:05 +0000910 * Returns: 0 = need more data, -1 = wrong cookie, 1 = ok
Damien Millerb38eff82000-04-01 11:09:21 +1000911 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000912static int
Ben Lindstrome9c99912001-06-09 00:41:05 +0000913x11_open_helper(Buffer *b)
Damien Millerb38eff82000-04-01 11:09:21 +1000914{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000915 u_char *ucp;
916 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000917
djm@openbsd.org1bf477d2015-07-01 02:26:31 +0000918 /* Is this being called after the refusal deadline? */
919 if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) {
920 verbose("Rejected X11 connection after ForwardX11Timeout "
921 "expired");
922 return -1;
923 }
924
Damien Millerb38eff82000-04-01 11:09:21 +1000925 /* Check if the fixed size part of the packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000926 if (buffer_len(b) < 12)
Damien Millerb38eff82000-04-01 11:09:21 +1000927 return 0;
928
929 /* Parse the lengths of variable-length fields. */
Damien Miller708d21c2002-01-22 23:18:15 +1100930 ucp = buffer_ptr(b);
Damien Millerb38eff82000-04-01 11:09:21 +1000931 if (ucp[0] == 0x42) { /* Byte order MSB first. */
932 proto_len = 256 * ucp[6] + ucp[7];
933 data_len = 256 * ucp[8] + ucp[9];
934 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
935 proto_len = ucp[6] + 256 * ucp[7];
936 data_len = ucp[8] + 256 * ucp[9];
937 } else {
Damien Millerfbdeece2003-09-02 22:52:31 +1000938 debug2("Initial X11 packet contains bad byte order byte: 0x%x",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100939 ucp[0]);
Damien Millerb38eff82000-04-01 11:09:21 +1000940 return -1;
941 }
942
943 /* Check if the whole packet is in buffer. */
Ben Lindstrome9c99912001-06-09 00:41:05 +0000944 if (buffer_len(b) <
Damien Millerb38eff82000-04-01 11:09:21 +1000945 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
946 return 0;
947
948 /* Check if authentication protocol matches. */
949 if (proto_len != strlen(x11_saved_proto) ||
950 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000951 debug2("X11 connection uses different authentication protocol.");
Damien Millerb38eff82000-04-01 11:09:21 +1000952 return -1;
953 }
954 /* Check if authentication data matches our fake data. */
955 if (data_len != x11_fake_data_len ||
Damien Millerea1651c2010-07-16 13:58:37 +1000956 timingsafe_bcmp(ucp + 12 + ((proto_len + 3) & ~3),
Damien Millerb38eff82000-04-01 11:09:21 +1000957 x11_fake_data, x11_fake_data_len) != 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +1000958 debug2("X11 auth data does not match fake data.");
Damien Millerb38eff82000-04-01 11:09:21 +1000959 return -1;
960 }
961 /* Check fake data length */
962 if (x11_fake_data_len != x11_saved_data_len) {
963 error("X11 fake_data_len %d != saved_data_len %d",
964 x11_fake_data_len, x11_saved_data_len);
965 return -1;
966 }
967 /*
968 * Received authentication protocol and data match
969 * our fake data. Substitute the fake data with real
970 * data.
971 */
972 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
973 x11_saved_data, x11_saved_data_len);
974 return 1;
975}
976
Ben Lindstrombba81212001-06-25 05:01:22 +0000977static void
Damien Millerd62f2ca2006-03-26 13:57:41 +1100978channel_pre_x11_open_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000979{
Ben Lindstrome9c99912001-06-09 00:41:05 +0000980 int ret = x11_open_helper(&c->output);
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +0000981
Damien Millerb38eff82000-04-01 11:09:21 +1000982 if (ret == 1) {
983 /* Start normal processing for the channel. */
984 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000985 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000986 } else if (ret == -1) {
987 /*
988 * We have received an X11 connection that has bad
989 * authentication information.
990 */
Damien Miller996acd22003-04-09 20:59:48 +1000991 logit("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000992 buffer_clear(&c->input);
993 buffer_clear(&c->output);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000994 channel_close_fd(&c->sock);
Damien Millerb38eff82000-04-01 11:09:21 +1000995 c->sock = -1;
996 c->type = SSH_CHANNEL_CLOSED;
997 packet_start(SSH_MSG_CHANNEL_CLOSE);
998 packet_put_int(c->remote_id);
999 packet_send();
1000 }
1001}
1002
Ben Lindstrombba81212001-06-25 05:01:22 +00001003static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001004channel_pre_x11_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001005{
Ben Lindstrome9c99912001-06-09 00:41:05 +00001006 int ret = x11_open_helper(&c->output);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00001007
1008 /* c->force_drain = 1; */
1009
Damien Millerb38eff82000-04-01 11:09:21 +10001010 if (ret == 1) {
1011 c->type = SSH_CHANNEL_OPEN;
Damien Millerde6987c2002-01-22 23:20:40 +11001012 channel_pre_open(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +10001013 } else if (ret == -1) {
Damien Miller996acd22003-04-09 20:59:48 +10001014 logit("X11 connection rejected because of wrong authentication.");
Damien Millerfbdeece2003-09-02 22:52:31 +10001015 debug2("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millera90fc082002-01-22 23:19:38 +11001016 chan_read_failed(c);
1017 buffer_clear(&c->input);
1018 chan_ibuf_empty(c);
1019 buffer_clear(&c->output);
1020 /* for proto v1, the peer will send an IEOF */
1021 if (compat20)
1022 chan_write_failed(c);
1023 else
1024 c->type = SSH_CHANNEL_OPEN;
Damien Millerfbdeece2003-09-02 22:52:31 +10001025 debug2("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerb38eff82000-04-01 11:09:21 +10001026 }
1027}
1028
Damien Millere1537f92010-01-26 13:26:22 +11001029static void
1030channel_pre_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
1031{
Damien Millerd530f5f2010-05-21 14:57:10 +10001032 if (c->istate == CHAN_INPUT_OPEN && !c->mux_pause &&
Damien Millere1537f92010-01-26 13:26:22 +11001033 buffer_check_alloc(&c->input, CHAN_RBUF))
1034 FD_SET(c->rfd, readset);
1035 if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
1036 /* clear buffer immediately (discard any partial packet) */
1037 buffer_clear(&c->input);
1038 chan_ibuf_empty(c);
1039 /* Start output drain. XXX just kill chan? */
1040 chan_rcvd_oclose(c);
1041 }
1042 if (c->ostate == CHAN_OUTPUT_OPEN ||
1043 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
1044 if (buffer_len(&c->output) > 0)
1045 FD_SET(c->wfd, writeset);
1046 else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN)
1047 chan_obuf_empty(c);
1048 }
1049}
1050
Ben Lindstromb3921512001-04-11 15:57:50 +00001051/* try to decode a socks4 header */
Damien Miller8473dd82006-07-24 14:08:32 +10001052/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001053static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001054channel_decode_socks4(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001055{
Damien Millera10f5612002-09-12 09:49:15 +10001056 char *p, *host;
Damien Miller1781f532009-01-28 16:24:41 +11001057 u_int len, have, i, found, need;
Damien Miller9f0f5c62001-12-21 14:45:46 +11001058 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001059 struct {
1060 u_int8_t version;
1061 u_int8_t command;
1062 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +00001063 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001064 } s4_req, s4_rsp;
1065
Ben Lindstromb3921512001-04-11 15:57:50 +00001066 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001067
1068 have = buffer_len(&c->input);
1069 len = sizeof(s4_req);
1070 if (have < len)
1071 return 0;
djm@openbsd.orgbb005dc2014-10-08 22:15:06 +00001072 p = (char *)buffer_ptr(&c->input);
Damien Miller1781f532009-01-28 16:24:41 +11001073
1074 need = 1;
1075 /* SOCKS4A uses an invalid IP address 0.0.0.x */
1076 if (p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] != 0) {
1077 debug2("channel %d: socks4a request", c->self);
1078 /* ... and needs an extra string (the hostname) */
1079 need = 2;
1080 }
1081 /* Check for terminating NUL on the string(s) */
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001082 for (found = 0, i = len; i < have; i++) {
1083 if (p[i] == '\0') {
Damien Miller1781f532009-01-28 16:24:41 +11001084 found++;
1085 if (found == need)
1086 break;
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001087 }
1088 if (i > 1024) {
1089 /* the peer is probably sending garbage */
1090 debug("channel %d: decode socks4: too long",
1091 c->self);
1092 return -1;
1093 }
1094 }
Damien Miller1781f532009-01-28 16:24:41 +11001095 if (found < need)
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001096 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001097 buffer_get(&c->input, (char *)&s4_req.version, 1);
1098 buffer_get(&c->input, (char *)&s4_req.command, 1);
1099 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +00001100 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +00001101 have = buffer_len(&c->input);
djm@openbsd.orgbb005dc2014-10-08 22:15:06 +00001102 p = (char *)buffer_ptr(&c->input);
Damien Miller13481292014-02-27 10:18:32 +11001103 if (memchr(p, '\0', have) == NULL)
1104 fatal("channel %d: decode socks4: user not nul terminated",
1105 c->self);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001106 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001107 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Damien Miller1781f532009-01-28 16:24:41 +11001108 len++; /* trailing '\0' */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001109 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +00001110 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001111 c->self, len, have);
1112 strlcpy(username, p, sizeof(username));
1113 buffer_consume(&c->input, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001114
Darren Tuckera627d422013-06-02 07:31:17 +10001115 free(c->path);
1116 c->path = NULL;
Damien Miller1781f532009-01-28 16:24:41 +11001117 if (need == 1) { /* SOCKS4: one string */
1118 host = inet_ntoa(s4_req.dest_addr);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001119 c->path = xstrdup(host);
Damien Miller1781f532009-01-28 16:24:41 +11001120 } else { /* SOCKS4A: two strings */
1121 have = buffer_len(&c->input);
djm@openbsd.orgbb005dc2014-10-08 22:15:06 +00001122 p = (char *)buffer_ptr(&c->input);
Damien Miller1781f532009-01-28 16:24:41 +11001123 len = strlen(p);
1124 debug2("channel %d: decode socks4a: host %s/%d",
1125 c->self, p, len);
1126 len++; /* trailing '\0' */
1127 if (len > have)
1128 fatal("channel %d: decode socks4a: len %d > have %d",
1129 c->self, len, have);
Damien Millera1c1b6c2009-01-28 16:29:49 +11001130 if (len > NI_MAXHOST) {
Damien Miller1781f532009-01-28 16:24:41 +11001131 error("channel %d: hostname \"%.100s\" too long",
1132 c->self, p);
1133 return -1;
1134 }
Damien Millera1c1b6c2009-01-28 16:29:49 +11001135 c->path = xstrdup(p);
Damien Miller1781f532009-01-28 16:24:41 +11001136 buffer_consume(&c->input, len);
1137 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001138 c->host_port = ntohs(s4_req.dest_port);
Damien Miller9f0f5c62001-12-21 14:45:46 +11001139
Damien Millerfbdeece2003-09-02 22:52:31 +10001140 debug2("channel %d: dynamic request: socks4 host %s port %u command %u",
Damien Miller1781f532009-01-28 16:24:41 +11001141 c->self, c->path, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001142
Ben Lindstromb3921512001-04-11 15:57:50 +00001143 if (s4_req.command != 1) {
Damien Miller1781f532009-01-28 16:24:41 +11001144 debug("channel %d: cannot handle: %s cn %d",
1145 c->self, need == 1 ? "SOCKS4" : "SOCKS4A", s4_req.command);
Ben Lindstromb3921512001-04-11 15:57:50 +00001146 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001147 }
Ben Lindstromb3921512001-04-11 15:57:50 +00001148 s4_rsp.version = 0; /* vn: 0 for reply */
1149 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001150 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +00001151 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Damien Millera0fdce92006-03-26 14:28:50 +11001152 buffer_append(&c->output, &s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +00001153 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001154}
1155
Darren Tucker46471c92003-07-03 13:55:19 +10001156/* try to decode a socks5 header */
1157#define SSH_SOCKS5_AUTHDONE 0x1000
1158#define SSH_SOCKS5_NOAUTH 0x00
1159#define SSH_SOCKS5_IPV4 0x01
1160#define SSH_SOCKS5_DOMAIN 0x03
1161#define SSH_SOCKS5_IPV6 0x04
1162#define SSH_SOCKS5_CONNECT 0x01
1163#define SSH_SOCKS5_SUCCESS 0x00
1164
Damien Miller8473dd82006-07-24 14:08:32 +10001165/* ARGSUSED */
Darren Tucker46471c92003-07-03 13:55:19 +10001166static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001167channel_decode_socks5(Channel *c, fd_set *readset, fd_set *writeset)
Darren Tucker46471c92003-07-03 13:55:19 +10001168{
1169 struct {
1170 u_int8_t version;
1171 u_int8_t command;
1172 u_int8_t reserved;
1173 u_int8_t atyp;
1174 } s5_req, s5_rsp;
1175 u_int16_t dest_port;
Damien Millerce986542013-07-18 16:12:44 +10001176 char dest_addr[255+1], ntop[INET6_ADDRSTRLEN];
1177 u_char *p;
Damien Miller0f077072006-07-10 22:21:02 +10001178 u_int have, need, i, found, nmethods, addrlen, af;
Darren Tucker46471c92003-07-03 13:55:19 +10001179
1180 debug2("channel %d: decode socks5", c->self);
1181 p = buffer_ptr(&c->input);
1182 if (p[0] != 0x05)
1183 return -1;
1184 have = buffer_len(&c->input);
1185 if (!(c->flags & SSH_SOCKS5_AUTHDONE)) {
1186 /* format: ver | nmethods | methods */
Damien Millera8e06ce2003-11-21 23:48:55 +11001187 if (have < 2)
Darren Tucker46471c92003-07-03 13:55:19 +10001188 return 0;
1189 nmethods = p[1];
1190 if (have < nmethods + 2)
1191 return 0;
1192 /* look for method: "NO AUTHENTICATION REQUIRED" */
Damien Miller80163902007-01-05 16:30:16 +11001193 for (found = 0, i = 2; i < nmethods + 2; i++) {
Damien Miller4dec5d72006-08-05 11:38:40 +10001194 if (p[i] == SSH_SOCKS5_NOAUTH) {
Darren Tucker46471c92003-07-03 13:55:19 +10001195 found = 1;
1196 break;
1197 }
1198 }
1199 if (!found) {
1200 debug("channel %d: method SSH_SOCKS5_NOAUTH not found",
1201 c->self);
1202 return -1;
1203 }
1204 buffer_consume(&c->input, nmethods + 2);
1205 buffer_put_char(&c->output, 0x05); /* version */
1206 buffer_put_char(&c->output, SSH_SOCKS5_NOAUTH); /* method */
1207 FD_SET(c->sock, writeset);
1208 c->flags |= SSH_SOCKS5_AUTHDONE;
1209 debug2("channel %d: socks5 auth done", c->self);
1210 return 0; /* need more */
1211 }
1212 debug2("channel %d: socks5 post auth", c->self);
1213 if (have < sizeof(s5_req)+1)
1214 return 0; /* need more */
Damien Millere3b21a52006-03-26 14:29:06 +11001215 memcpy(&s5_req, p, sizeof(s5_req));
Darren Tucker46471c92003-07-03 13:55:19 +10001216 if (s5_req.version != 0x05 ||
1217 s5_req.command != SSH_SOCKS5_CONNECT ||
1218 s5_req.reserved != 0x00) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001219 debug2("channel %d: only socks5 connect supported", c->self);
Darren Tucker46471c92003-07-03 13:55:19 +10001220 return -1;
1221 }
Darren Tucker47eede72005-03-14 23:08:12 +11001222 switch (s5_req.atyp){
Darren Tucker46471c92003-07-03 13:55:19 +10001223 case SSH_SOCKS5_IPV4:
1224 addrlen = 4;
1225 af = AF_INET;
1226 break;
1227 case SSH_SOCKS5_DOMAIN:
1228 addrlen = p[sizeof(s5_req)];
1229 af = -1;
1230 break;
1231 case SSH_SOCKS5_IPV6:
1232 addrlen = 16;
1233 af = AF_INET6;
1234 break;
1235 default:
Damien Millerfbdeece2003-09-02 22:52:31 +10001236 debug2("channel %d: bad socks5 atyp %d", c->self, s5_req.atyp);
Darren Tucker46471c92003-07-03 13:55:19 +10001237 return -1;
1238 }
Damien Miller0f077072006-07-10 22:21:02 +10001239 need = sizeof(s5_req) + addrlen + 2;
1240 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1241 need++;
1242 if (have < need)
Darren Tucker46471c92003-07-03 13:55:19 +10001243 return 0;
1244 buffer_consume(&c->input, sizeof(s5_req));
1245 if (s5_req.atyp == SSH_SOCKS5_DOMAIN)
1246 buffer_consume(&c->input, 1); /* host string length */
Damien Millerce986542013-07-18 16:12:44 +10001247 buffer_get(&c->input, &dest_addr, addrlen);
Darren Tucker46471c92003-07-03 13:55:19 +10001248 buffer_get(&c->input, (char *)&dest_port, 2);
1249 dest_addr[addrlen] = '\0';
Darren Tuckera627d422013-06-02 07:31:17 +10001250 free(c->path);
1251 c->path = NULL;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001252 if (s5_req.atyp == SSH_SOCKS5_DOMAIN) {
Damien Miller9576ac42009-01-28 16:30:33 +11001253 if (addrlen >= NI_MAXHOST) {
Damien Millera1c1b6c2009-01-28 16:29:49 +11001254 error("channel %d: dynamic request: socks5 hostname "
1255 "\"%.100s\" too long", c->self, dest_addr);
1256 return -1;
1257 }
1258 c->path = xstrdup(dest_addr);
1259 } else {
1260 if (inet_ntop(af, dest_addr, ntop, sizeof(ntop)) == NULL)
1261 return -1;
1262 c->path = xstrdup(ntop);
1263 }
Darren Tucker46471c92003-07-03 13:55:19 +10001264 c->host_port = ntohs(dest_port);
Damien Miller787b2ec2003-11-21 23:56:47 +11001265
Damien Millerfbdeece2003-09-02 22:52:31 +10001266 debug2("channel %d: dynamic request: socks5 host %s port %u command %u",
Darren Tucker46471c92003-07-03 13:55:19 +10001267 c->self, c->path, c->host_port, s5_req.command);
1268
1269 s5_rsp.version = 0x05;
1270 s5_rsp.command = SSH_SOCKS5_SUCCESS;
1271 s5_rsp.reserved = 0; /* ignored */
1272 s5_rsp.atyp = SSH_SOCKS5_IPV4;
Darren Tucker46471c92003-07-03 13:55:19 +10001273 dest_port = 0; /* ignored */
1274
Damien Millera0fdce92006-03-26 14:28:50 +11001275 buffer_append(&c->output, &s5_rsp, sizeof(s5_rsp));
Damien Miller13840e02013-09-14 09:49:43 +10001276 buffer_put_int(&c->output, ntohl(INADDR_ANY)); /* bind address */
Damien Millera0fdce92006-03-26 14:28:50 +11001277 buffer_append(&c->output, &dest_port, sizeof(dest_port));
Darren Tucker46471c92003-07-03 13:55:19 +10001278 return 1;
1279}
1280
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001281Channel *
Damien Millere1537f92010-01-26 13:26:22 +11001282channel_connect_stdio_fwd(const char *host_to_connect, u_short port_to_connect,
1283 int in, int out)
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001284{
1285 Channel *c;
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001286
1287 debug("channel_connect_stdio_fwd %s:%d", host_to_connect,
1288 port_to_connect);
1289
Darren Tucker7ad8dd22010-01-12 19:40:27 +11001290 c = channel_new("stdio-forward", SSH_CHANNEL_OPENING, in, out,
1291 -1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
1292 0, "stdio-forward", /*nonblock*/0);
1293
1294 c->path = xstrdup(host_to_connect);
1295 c->host_port = port_to_connect;
1296 c->listening_port = 0;
1297 c->force_drain = 1;
1298
1299 channel_register_fds(c, in, out, -1, 0, 1, 0);
1300 port_open_helper(c, "direct-tcpip");
1301
1302 return c;
1303}
1304
Ben Lindstromb3921512001-04-11 15:57:50 +00001305/* dynamic port forwarding */
Ben Lindstrombba81212001-06-25 05:01:22 +00001306static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001307channel_pre_dynamic(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstromb3921512001-04-11 15:57:50 +00001308{
1309 u_char *p;
Damien Millereccb9de2005-06-17 12:59:34 +10001310 u_int have;
1311 int ret;
Ben Lindstromb3921512001-04-11 15:57:50 +00001312
1313 have = buffer_len(&c->input);
Ben Lindstromb3921512001-04-11 15:57:50 +00001314 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +00001315 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +00001316 /* check if the fixed size part of the packet is in buffer. */
Darren Tucker46471c92003-07-03 13:55:19 +10001317 if (have < 3) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001318 /* need more */
1319 FD_SET(c->sock, readset);
1320 return;
1321 }
1322 /* try to guess the protocol */
1323 p = buffer_ptr(&c->input);
1324 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +00001325 case 0x04:
1326 ret = channel_decode_socks4(c, readset, writeset);
1327 break;
Darren Tucker46471c92003-07-03 13:55:19 +10001328 case 0x05:
1329 ret = channel_decode_socks5(c, readset, writeset);
1330 break;
Ben Lindstromb3921512001-04-11 15:57:50 +00001331 default:
1332 ret = -1;
1333 break;
1334 }
1335 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001336 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001337 } else if (ret == 0) {
1338 debug2("channel %d: pre_dynamic: need more", c->self);
1339 /* need more */
1340 FD_SET(c->sock, readset);
1341 } else {
1342 /* switch to the next state */
1343 c->type = SSH_CHANNEL_OPENING;
1344 port_open_helper(c, "direct-tcpip");
1345 }
1346}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001347
Damien Millerb38eff82000-04-01 11:09:21 +10001348/* This is our fake X11 server socket. */
Damien Miller8473dd82006-07-24 14:08:32 +10001349/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001350static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001351channel_post_x11_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001352{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001353 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001354 struct sockaddr_storage addr;
Damien Miller37f1c082013-04-23 15:20:43 +10001355 int newsock, oerrno;
Damien Millerb38eff82000-04-01 11:09:21 +10001356 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +11001357 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +10001358 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +10001359
1360 if (FD_ISSET(c->sock, readset)) {
1361 debug("X11 connection requested.");
1362 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001363 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millere7378562001-12-21 14:58:35 +11001364 if (c->single_connection) {
Damien Miller37f1c082013-04-23 15:20:43 +10001365 oerrno = errno;
Damien Millerfbdeece2003-09-02 22:52:31 +10001366 debug2("single_connection: closing X11 listener.");
Damien Millere7378562001-12-21 14:58:35 +11001367 channel_close_fd(&c->sock);
1368 chan_mark_dead(c);
Damien Miller37f1c082013-04-23 15:20:43 +10001369 errno = oerrno;
Damien Millere7378562001-12-21 14:58:35 +11001370 }
Damien Millerb38eff82000-04-01 11:09:21 +10001371 if (newsock < 0) {
Damien Miller37f1c082013-04-23 15:20:43 +10001372 if (errno != EINTR && errno != EWOULDBLOCK &&
1373 errno != ECONNABORTED)
1374 error("accept: %.100s", strerror(errno));
Damien Millera6508752012-04-22 11:21:10 +10001375 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001376 c->notbefore = monotime() + 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001377 return;
1378 }
Damien Miller398e1cf2002-02-05 11:52:13 +11001379 set_nodelay(newsock);
Damien Millerd83ff352001-01-30 09:19:34 +11001380 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +10001381 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +10001382 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +11001383 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +10001384
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001385 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +10001386 SSH_CHANNEL_OPENING, newsock, newsock, -1,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001387 c->local_window_max, c->local_maxpacket, 0, buf, 1);
Damien Millerbd483e72000-04-30 10:00:53 +10001388 if (compat20) {
1389 packet_start(SSH2_MSG_CHANNEL_OPEN);
1390 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001391 packet_put_int(nc->self);
Damien Millere7378562001-12-21 14:58:35 +11001392 packet_put_int(nc->local_window_max);
1393 packet_put_int(nc->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +11001394 /* originator ipaddr and port */
1395 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +10001396 if (datafellows & SSH_BUG_X11FWD) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001397 debug2("ssh2 x11 bug compat mode");
Damien Miller30c3d422000-05-09 11:02:59 +10001398 } else {
1399 packet_put_int(remote_port);
1400 }
Damien Millerbd483e72000-04-30 10:00:53 +10001401 packet_send();
1402 } else {
1403 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001404 packet_put_int(nc->self);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001405 if (packet_get_protocol_flags() &
1406 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom664408d2001-06-09 01:42:01 +00001407 packet_put_cstring(buf);
Damien Millerbd483e72000-04-30 10:00:53 +10001408 packet_send();
1409 }
Darren Tuckera627d422013-06-02 07:31:17 +10001410 free(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +10001411 }
1412}
1413
Ben Lindstrombba81212001-06-25 05:01:22 +00001414static void
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001415port_open_helper(Channel *c, char *rtype)
1416{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001417 char buf[1024];
Damien Miller4def1842013-12-29 17:45:26 +11001418 char *local_ipaddr = get_local_ipaddr(c->sock);
djm@openbsd.org95767262016-03-07 19:02:43 +00001419 int local_port = c->sock == -1 ? 65536 : get_local_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001420 char *remote_ipaddr = get_peer_ipaddr(c->sock);
Damien Miller677257f2005-06-17 12:55:03 +10001421 int remote_port = get_peer_port(c->sock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001422
Damien Millerd6369432010-02-02 17:02:07 +11001423 if (remote_port == -1) {
1424 /* Fake addr/port to appease peers that validate it (Tectia) */
Darren Tuckera627d422013-06-02 07:31:17 +10001425 free(remote_ipaddr);
Damien Millerd6369432010-02-02 17:02:07 +11001426 remote_ipaddr = xstrdup("127.0.0.1");
1427 remote_port = 65535;
1428 }
1429
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001430 snprintf(buf, sizeof buf,
1431 "%s: listening port %d for %.100s port %d, "
Damien Miller4def1842013-12-29 17:45:26 +11001432 "connect from %.200s port %d to %.100s port %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001433 rtype, c->listening_port, c->path, c->host_port,
Damien Miller4def1842013-12-29 17:45:26 +11001434 remote_ipaddr, remote_port, local_ipaddr, local_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001435
Darren Tuckera627d422013-06-02 07:31:17 +10001436 free(c->remote_name);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001437 c->remote_name = xstrdup(buf);
1438
1439 if (compat20) {
1440 packet_start(SSH2_MSG_CHANNEL_OPEN);
1441 packet_put_cstring(rtype);
1442 packet_put_int(c->self);
1443 packet_put_int(c->local_window_max);
1444 packet_put_int(c->local_maxpacket);
Damien Miller7acefbb2014-07-18 14:11:24 +10001445 if (strcmp(rtype, "direct-tcpip") == 0) {
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001446 /* target host, port */
1447 packet_put_cstring(c->path);
1448 packet_put_int(c->host_port);
Damien Miller7acefbb2014-07-18 14:11:24 +10001449 } else if (strcmp(rtype, "direct-streamlocal@openssh.com") == 0) {
1450 /* target path */
1451 packet_put_cstring(c->path);
1452 } else if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
1453 /* listen path */
1454 packet_put_cstring(c->path);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001455 } else {
1456 /* listen address, port */
1457 packet_put_cstring(c->path);
Damien Miller4def1842013-12-29 17:45:26 +11001458 packet_put_int(local_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001459 }
Damien Miller7acefbb2014-07-18 14:11:24 +10001460 if (strcmp(rtype, "forwarded-streamlocal@openssh.com") == 0) {
1461 /* reserved for future owner/mode info */
1462 packet_put_cstring("");
1463 } else {
1464 /* originator host and port */
1465 packet_put_cstring(remote_ipaddr);
1466 packet_put_int((u_int)remote_port);
1467 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001468 packet_send();
1469 } else {
1470 packet_start(SSH_MSG_PORT_OPEN);
1471 packet_put_int(c->self);
1472 packet_put_cstring(c->path);
1473 packet_put_int(c->host_port);
Ben Lindstrome9c99912001-06-09 00:41:05 +00001474 if (packet_get_protocol_flags() &
1475 SSH_PROTOFLAG_HOST_IN_FWD_OPEN)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001476 packet_put_cstring(c->remote_name);
1477 packet_send();
1478 }
Darren Tuckera627d422013-06-02 07:31:17 +10001479 free(remote_ipaddr);
Damien Miller4def1842013-12-29 17:45:26 +11001480 free(local_ipaddr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001481}
1482
Damien Miller5e7fd072005-11-05 14:53:39 +11001483static void
1484channel_set_reuseaddr(int fd)
1485{
1486 int on = 1;
1487
1488 /*
1489 * Set socket options.
1490 * Allow local port reuse in TIME_WAIT.
1491 */
1492 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1)
1493 error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
1494}
1495
djm@openbsd.org1bf477d2015-07-01 02:26:31 +00001496void
1497channel_set_x11_refuse_time(u_int refuse_time)
1498{
1499 x11_refuse_time = refuse_time;
1500}
1501
Damien Millerb38eff82000-04-01 11:09:21 +10001502/*
1503 * This socket is listening for connections to a forwarded TCP/IP port.
1504 */
Damien Miller8473dd82006-07-24 14:08:32 +10001505/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001506static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001507channel_post_port_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001508{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001509 Channel *nc;
Damien Miller163886f2008-07-14 11:28:58 +10001510 struct sockaddr_storage addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001511 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +10001512 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001513 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001514
Damien Millerb38eff82000-04-01 11:09:21 +10001515 if (FD_ISSET(c->sock, readset)) {
1516 debug("Connection to port %d forwarding "
1517 "to %.100s port %d requested.",
1518 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001519
Damien Miller4623a752001-10-10 15:03:58 +10001520 if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
1521 nextstate = SSH_CHANNEL_OPENING;
1522 rtype = "forwarded-tcpip";
Damien Miller7acefbb2014-07-18 14:11:24 +10001523 } else if (c->type == SSH_CHANNEL_RUNIX_LISTENER) {
1524 nextstate = SSH_CHANNEL_OPENING;
1525 rtype = "forwarded-streamlocal@openssh.com";
1526 } else if (c->host_port == PORT_STREAMLOCAL) {
1527 nextstate = SSH_CHANNEL_OPENING;
1528 rtype = "direct-streamlocal@openssh.com";
1529 } else if (c->host_port == 0) {
1530 nextstate = SSH_CHANNEL_DYNAMIC;
1531 rtype = "dynamic-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001532 } else {
Damien Miller7acefbb2014-07-18 14:11:24 +10001533 nextstate = SSH_CHANNEL_OPENING;
1534 rtype = "direct-tcpip";
Damien Miller4623a752001-10-10 15:03:58 +10001535 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001536
Damien Millerb38eff82000-04-01 11:09:21 +10001537 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001538 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001539 if (newsock < 0) {
Damien Miller37f1c082013-04-23 15:20:43 +10001540 if (errno != EINTR && errno != EWOULDBLOCK &&
1541 errno != ECONNABORTED)
1542 error("accept: %.100s", strerror(errno));
Damien Millera6508752012-04-22 11:21:10 +10001543 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001544 c->notbefore = monotime() + 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001545 return;
1546 }
Damien Miller7acefbb2014-07-18 14:11:24 +10001547 if (c->host_port != PORT_STREAMLOCAL)
1548 set_nodelay(newsock);
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001549 nc = channel_new(rtype, nextstate, newsock, newsock, -1,
1550 c->local_window_max, c->local_maxpacket, 0, rtype, 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001551 nc->listening_port = c->listening_port;
1552 nc->host_port = c->host_port;
Damien Millera1c1b6c2009-01-28 16:29:49 +11001553 if (c->path != NULL)
1554 nc->path = xstrdup(c->path);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001555
Darren Tucker876045b2010-01-08 17:08:00 +11001556 if (nextstate != SSH_CHANNEL_DYNAMIC)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001557 port_open_helper(nc, rtype);
Damien Millerb38eff82000-04-01 11:09:21 +10001558 }
1559}
1560
1561/*
1562 * This is the authentication agent socket listening for connections from
1563 * clients.
1564 */
Damien Miller8473dd82006-07-24 14:08:32 +10001565/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001566static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001567channel_post_auth_listener(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001568{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001569 Channel *nc;
1570 int newsock;
Damien Miller163886f2008-07-14 11:28:58 +10001571 struct sockaddr_storage addr;
Damien Millerb38eff82000-04-01 11:09:21 +10001572 socklen_t addrlen;
1573
1574 if (FD_ISSET(c->sock, readset)) {
1575 addrlen = sizeof(addr);
Damien Miller163886f2008-07-14 11:28:58 +10001576 newsock = accept(c->sock, (struct sockaddr *)&addr, &addrlen);
Damien Millerb38eff82000-04-01 11:09:21 +10001577 if (newsock < 0) {
Damien Millera6508752012-04-22 11:21:10 +10001578 error("accept from auth socket: %.100s",
1579 strerror(errno));
1580 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001581 c->notbefore = monotime() + 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001582 return;
1583 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001584 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11001585 SSH_CHANNEL_OPENING, newsock, newsock, -1,
1586 c->local_window_max, c->local_maxpacket,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001587 0, "accepted auth socket", 1);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001588 if (compat20) {
1589 packet_start(SSH2_MSG_CHANNEL_OPEN);
1590 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001591 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001592 packet_put_int(c->local_window_max);
1593 packet_put_int(c->local_maxpacket);
1594 } else {
1595 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001596 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001597 }
Damien Millerb38eff82000-04-01 11:09:21 +10001598 packet_send();
1599 }
1600}
1601
Damien Miller8473dd82006-07-24 14:08:32 +10001602/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001603static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001604channel_post_connecting(Channel *c, fd_set *readset, fd_set *writeset)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001605{
Damien Millerbd740252008-05-19 15:37:09 +10001606 int err = 0, sock;
Ben Lindstrom11180952001-07-04 05:13:35 +00001607 socklen_t sz = sizeof(err);
Ben Lindstrom69128662001-05-08 20:07:39 +00001608
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001609 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom733a2352002-03-05 01:31:28 +00001610 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, &err, &sz) < 0) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001611 err = errno;
1612 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001613 }
Ben Lindstrom69128662001-05-08 20:07:39 +00001614 if (err == 0) {
Damien Millerbd740252008-05-19 15:37:09 +10001615 debug("channel %d: connected to %s port %d",
1616 c->self, c->connect_ctx.host, c->connect_ctx.port);
1617 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001618 c->type = SSH_CHANNEL_OPEN;
1619 if (compat20) {
1620 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1621 packet_put_int(c->remote_id);
1622 packet_put_int(c->self);
1623 packet_put_int(c->local_window);
1624 packet_put_int(c->local_maxpacket);
1625 } else {
1626 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
1627 packet_put_int(c->remote_id);
1628 packet_put_int(c->self);
1629 }
1630 } else {
Damien Millerbd740252008-05-19 15:37:09 +10001631 debug("channel %d: connection failed: %s",
Ben Lindstrom69128662001-05-08 20:07:39 +00001632 c->self, strerror(err));
Damien Millerbd740252008-05-19 15:37:09 +10001633 /* Try next address, if any */
1634 if ((sock = connect_next(&c->connect_ctx)) > 0) {
1635 close(c->sock);
1636 c->sock = c->rfd = c->wfd = sock;
1637 channel_max_fd = channel_find_maxfd();
1638 return;
1639 }
1640 /* Exhausted all addresses */
1641 error("connect_to %.100s port %d: failed.",
1642 c->connect_ctx.host, c->connect_ctx.port);
1643 channel_connect_ctx_free(&c->connect_ctx);
Ben Lindstrom69128662001-05-08 20:07:39 +00001644 if (compat20) {
1645 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1646 packet_put_int(c->remote_id);
1647 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
1648 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
1649 packet_put_cstring(strerror(err));
1650 packet_put_cstring("");
1651 }
1652 } else {
1653 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
1654 packet_put_int(c->remote_id);
1655 }
1656 chan_mark_dead(c);
1657 }
1658 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001659 }
1660}
1661
Damien Miller8473dd82006-07-24 14:08:32 +10001662/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001663static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001664channel_handle_rfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001665{
Darren Tucker11327cc2005-03-14 23:22:25 +11001666 char buf[CHAN_RBUF];
Damien Miller835284b2007-06-11 13:03:16 +10001667 int len, force;
Damien Millerb38eff82000-04-01 11:09:21 +10001668
Damien Miller835284b2007-06-11 13:03:16 +10001669 force = c->isatty && c->detach_close && c->istate != CHAN_INPUT_CLOSED;
1670 if (c->rfd != -1 && (force || FD_ISSET(c->rfd, readset))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001671 errno = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001672 len = read(c->rfd, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +10001673 if (len < 0 && (errno == EINTR ||
1674 ((errno == EAGAIN || errno == EWOULDBLOCK) && !force)))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001675 return 1;
Darren Tucker9afe1152006-06-23 21:24:12 +10001676#ifndef PTY_ZEROREAD
Damien Millerb38eff82000-04-01 11:09:21 +10001677 if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001678#else
Darren Tucker144e8d62006-06-25 08:25:25 +10001679 if ((!c->isatty && len <= 0) ||
1680 (c->isatty && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +10001681#endif
Damien Millerfbdeece2003-09-02 22:52:31 +10001682 debug2("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +10001683 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +00001684 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001685 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001686 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001687 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +00001688 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001689 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10001690 c->type = SSH_CHANNEL_INPUT_DRAINING;
Damien Millerfbdeece2003-09-02 22:52:31 +10001691 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001692 } else {
1693 chan_read_failed(c);
1694 }
1695 return -1;
1696 }
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00001697 if (c->input_filter != NULL) {
Damien Millerad833b32000-08-23 10:46:23 +10001698 if (c->input_filter(c, buf, len) == -1) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001699 debug2("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +10001700 chan_read_failed(c);
1701 }
Damien Millerd27b9472005-12-13 19:29:02 +11001702 } else if (c->datagram) {
1703 buffer_put_string(&c->input, buf, len);
Damien Millerad833b32000-08-23 10:46:23 +10001704 } else {
1705 buffer_append(&c->input, buf, len);
1706 }
Damien Millerb38eff82000-04-01 11:09:21 +10001707 }
1708 return 1;
1709}
Damien Miller4f7becb2006-03-26 14:10:14 +11001710
Damien Miller8473dd82006-07-24 14:08:32 +10001711/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00001712static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001713channel_handle_wfd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001714{
Ben Lindstrome229b252001-03-05 06:28:06 +00001715 struct termios tio;
Damien Miller077b2382005-12-31 16:22:32 +11001716 u_char *data = NULL, *buf;
Damien Miller7d457182010-08-05 23:09:48 +10001717 u_int dlen, olen = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001718 int len;
1719
1720 /* Send buffered output data to the socket. */
Ben Lindstromc0dee1a2001-06-05 20:52:50 +00001721 if (c->wfd != -1 &&
Damien Millerb38eff82000-04-01 11:09:21 +10001722 FD_ISSET(c->wfd, writeset) &&
1723 buffer_len(&c->output) > 0) {
Damien Miller7d457182010-08-05 23:09:48 +10001724 olen = buffer_len(&c->output);
Damien Miller077b2382005-12-31 16:22:32 +11001725 if (c->output_filter != NULL) {
1726 if ((buf = c->output_filter(c, &data, &dlen)) == NULL) {
1727 debug2("channel %d: filter stops", c->self);
Damien Millere204f6a2006-01-31 21:47:15 +11001728 if (c->type != SSH_CHANNEL_OPEN)
1729 chan_mark_dead(c);
1730 else
1731 chan_write_failed(c);
1732 return -1;
Damien Miller077b2382005-12-31 16:22:32 +11001733 }
1734 } else if (c->datagram) {
1735 buf = data = buffer_get_string(&c->output, &dlen);
1736 } else {
1737 buf = data = buffer_ptr(&c->output);
1738 dlen = buffer_len(&c->output);
1739 }
1740
Damien Millerd27b9472005-12-13 19:29:02 +11001741 if (c->datagram) {
Damien Millerd27b9472005-12-13 19:29:02 +11001742 /* ignore truncated writes, datagrams might get lost */
Damien Miller077b2382005-12-31 16:22:32 +11001743 len = write(c->wfd, buf, dlen);
Darren Tuckera627d422013-06-02 07:31:17 +10001744 free(data);
Damien Millerd8968ad2008-07-04 23:10:49 +10001745 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1746 errno == EWOULDBLOCK))
Damien Millerd27b9472005-12-13 19:29:02 +11001747 return 1;
1748 if (len <= 0) {
1749 if (c->type != SSH_CHANNEL_OPEN)
1750 chan_mark_dead(c);
1751 else
1752 chan_write_failed(c);
1753 return -1;
1754 }
Damien Miller7d457182010-08-05 23:09:48 +10001755 goto out;
Damien Millerd27b9472005-12-13 19:29:02 +11001756 }
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001757#ifdef _AIX
Damien Millera8e06ce2003-11-21 23:48:55 +11001758 /* XXX: Later AIX versions can't push as much data to tty */
Darren Tucker240fdfa2003-11-22 14:10:02 +11001759 if (compat20 && c->wfd_isatty)
1760 dlen = MIN(dlen, 8*1024);
Ben Lindstrom92ea0ea2002-07-04 18:11:09 +00001761#endif
Damien Miller077b2382005-12-31 16:22:32 +11001762
1763 len = write(c->wfd, buf, dlen);
Damien Millerd8968ad2008-07-04 23:10:49 +10001764 if (len < 0 &&
1765 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK))
Damien Miller6f83b8e2000-05-02 09:23:45 +10001766 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +10001767 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +00001768 if (c->type != SSH_CHANNEL_OPEN) {
Damien Millerfbdeece2003-09-02 22:52:31 +10001769 debug2("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001770 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +00001771 return -1;
1772 } else if (compat13) {
Damien Miller76765c02002-01-22 23:21:15 +11001773 buffer_clear(&c->output);
Damien Millerfbdeece2003-09-02 22:52:31 +10001774 debug2("channel %d: input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +10001775 c->type = SSH_CHANNEL_INPUT_DRAINING;
1776 } else {
1777 chan_write_failed(c);
1778 }
1779 return -1;
1780 }
Darren Tucker3980b632009-08-28 11:02:37 +10001781#ifndef BROKEN_TCGETATTR_ICANON
Damien Miller077b2382005-12-31 16:22:32 +11001782 if (compat20 && c->isatty && dlen >= 1 && buf[0] != '\r') {
Damien Miller79438cc2001-02-16 12:34:57 +11001783 if (tcgetattr(c->wfd, &tio) == 0 &&
1784 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
1785 /*
1786 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +00001787 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +00001788 * size of a SSH2_MSG_CHANNEL_DATA message
Damien Miller077b2382005-12-31 16:22:32 +11001789 * (4 byte channel id + buf)
Damien Miller79438cc2001-02-16 12:34:57 +11001790 */
Ben Lindstrome229b252001-03-05 06:28:06 +00001791 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +11001792 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +11001793 }
1794 }
Darren Tucker3980b632009-08-28 11:02:37 +10001795#endif
Damien Millerb38eff82000-04-01 11:09:21 +10001796 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +10001797 }
Damien Miller7d457182010-08-05 23:09:48 +10001798 out:
1799 if (compat20 && olen > 0)
1800 c->local_consumed += olen - buffer_len(&c->output);
Damien Miller33b13562000-04-04 14:38:59 +10001801 return 1;
1802}
Damien Miller4f7becb2006-03-26 14:10:14 +11001803
Ben Lindstrombba81212001-06-25 05:01:22 +00001804static int
Damien Millerd62f2ca2006-03-26 13:57:41 +11001805channel_handle_efd(Channel *c, fd_set *readset, fd_set *writeset)
Damien Miller33b13562000-04-04 14:38:59 +10001806{
Darren Tucker11327cc2005-03-14 23:22:25 +11001807 char buf[CHAN_RBUF];
Damien Miller33b13562000-04-04 14:38:59 +10001808 int len;
1809
Damien Miller1383bd82000-04-06 12:32:37 +10001810/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +10001811 if (c->efd != -1) {
1812 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
1813 FD_ISSET(c->efd, writeset) &&
1814 buffer_len(&c->extended) > 0) {
1815 len = write(c->efd, buffer_ptr(&c->extended),
1816 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +11001817 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001818 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001819 if (len < 0 && (errno == EINTR || errno == EAGAIN ||
1820 errno == EWOULDBLOCK))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001821 return 1;
1822 if (len <= 0) {
1823 debug2("channel %d: closing write-efd %d",
1824 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001825 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001826 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001827 buffer_consume(&c->extended, len);
1828 c->local_consumed += len;
1829 }
Damien Miller8853ca52010-06-26 10:00:14 +10001830 } else if (c->efd != -1 &&
1831 (c->extended_usage == CHAN_EXTENDED_READ ||
1832 c->extended_usage == CHAN_EXTENDED_IGNORE) &&
Damien Millere42bd242007-01-29 10:16:28 +11001833 (c->detach_close || FD_ISSET(c->efd, readset))) {
Damien Miller33b13562000-04-04 14:38:59 +10001834 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001835 debug2("channel %d: read %d from efd %d",
Damien Miller9f0f5c62001-12-21 14:45:46 +11001836 c->self, len, c->efd);
Damien Millerd8968ad2008-07-04 23:10:49 +10001837 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
1838 errno == EWOULDBLOCK) && !c->detach_close)))
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001839 return 1;
1840 if (len <= 0) {
1841 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001842 c->self, c->efd);
Ben Lindstrom16d29d52001-07-18 16:01:46 +00001843 channel_close_fd(&c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001844 } else {
Damien Miller8853ca52010-06-26 10:00:14 +10001845 if (c->extended_usage == CHAN_EXTENDED_IGNORE) {
1846 debug3("channel %d: discard efd",
1847 c->self);
1848 } else
1849 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001850 }
Damien Miller33b13562000-04-04 14:38:59 +10001851 }
1852 }
1853 return 1;
1854}
Damien Miller4f7becb2006-03-26 14:10:14 +11001855
Damien Miller0e220db2004-06-15 10:34:08 +10001856static int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001857channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001858{
Ben Lindstromb3921512001-04-11 15:57:50 +00001859 if (c->type == SSH_CHANNEL_OPEN &&
1860 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Darren Tuckerae09cb82007-06-25 19:04:46 +10001861 ((c->local_window_max - c->local_window >
Damien Miller3191a8e2007-06-11 18:33:15 +10001862 c->local_maxpacket*3) ||
1863 c->local_window < c->local_window_max/2) &&
Damien Miller33b13562000-04-04 14:38:59 +10001864 c->local_consumed > 0) {
1865 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1866 packet_put_int(c->remote_id);
1867 packet_put_int(c->local_consumed);
1868 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001869 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001870 c->self, c->local_window,
1871 c->local_consumed);
1872 c->local_window += c->local_consumed;
1873 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001874 }
1875 return 1;
1876}
1877
Ben Lindstrombba81212001-06-25 05:01:22 +00001878static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11001879channel_post_open(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10001880{
1881 channel_handle_rfd(c, readset, writeset);
1882 channel_handle_wfd(c, readset, writeset);
Damien Millerde6987c2002-01-22 23:20:40 +11001883 if (!compat20)
Damien Miller4623a752001-10-10 15:03:58 +10001884 return;
Damien Miller33b13562000-04-04 14:38:59 +10001885 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001886 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001887}
1888
Damien Millere1537f92010-01-26 13:26:22 +11001889static u_int
1890read_mux(Channel *c, u_int need)
1891{
1892 char buf[CHAN_RBUF];
1893 int len;
1894 u_int rlen;
1895
1896 if (buffer_len(&c->input) < need) {
1897 rlen = need - buffer_len(&c->input);
1898 len = read(c->rfd, buf, MIN(rlen, CHAN_RBUF));
naddy@openbsd.org603ba412016-02-05 13:28:19 +00001899 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1900 return buffer_len(&c->input);
Damien Millere1537f92010-01-26 13:26:22 +11001901 if (len <= 0) {
naddy@openbsd.org603ba412016-02-05 13:28:19 +00001902 debug2("channel %d: ctl read<=0 rfd %d len %d",
1903 c->self, c->rfd, len);
1904 chan_read_failed(c);
1905 return 0;
Damien Millere1537f92010-01-26 13:26:22 +11001906 } else
1907 buffer_append(&c->input, buf, len);
1908 }
1909 return buffer_len(&c->input);
1910}
1911
1912static void
1913channel_post_mux_client(Channel *c, fd_set *readset, fd_set *writeset)
1914{
1915 u_int need;
1916 ssize_t len;
1917
1918 if (!compat20)
1919 fatal("%s: entered with !compat20", __func__);
1920
Damien Millerd530f5f2010-05-21 14:57:10 +10001921 if (c->rfd != -1 && !c->mux_pause && FD_ISSET(c->rfd, readset) &&
Damien Millere1537f92010-01-26 13:26:22 +11001922 (c->istate == CHAN_INPUT_OPEN ||
1923 c->istate == CHAN_INPUT_WAIT_DRAIN)) {
1924 /*
1925 * Don't not read past the precise end of packets to
1926 * avoid disrupting fd passing.
1927 */
1928 if (read_mux(c, 4) < 4) /* read header */
1929 return;
1930 need = get_u32(buffer_ptr(&c->input));
1931#define CHANNEL_MUX_MAX_PACKET (256 * 1024)
1932 if (need > CHANNEL_MUX_MAX_PACKET) {
1933 debug2("channel %d: packet too big %u > %u",
1934 c->self, CHANNEL_MUX_MAX_PACKET, need);
1935 chan_rcvd_oclose(c);
1936 return;
1937 }
1938 if (read_mux(c, need + 4) < need + 4) /* read body */
1939 return;
1940 if (c->mux_rcb(c) != 0) {
1941 debug("channel %d: mux_rcb failed", c->self);
1942 chan_mark_dead(c);
1943 return;
1944 }
1945 }
1946
1947 if (c->wfd != -1 && FD_ISSET(c->wfd, writeset) &&
1948 buffer_len(&c->output) > 0) {
1949 len = write(c->wfd, buffer_ptr(&c->output),
1950 buffer_len(&c->output));
1951 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1952 return;
1953 if (len <= 0) {
1954 chan_mark_dead(c);
1955 return;
1956 }
1957 buffer_consume(&c->output, len);
1958 }
1959}
1960
1961static void
1962channel_post_mux_listener(Channel *c, fd_set *readset, fd_set *writeset)
1963{
1964 Channel *nc;
1965 struct sockaddr_storage addr;
1966 socklen_t addrlen;
1967 int newsock;
1968 uid_t euid;
1969 gid_t egid;
1970
1971 if (!FD_ISSET(c->sock, readset))
1972 return;
1973
1974 debug("multiplexing control connection");
1975
1976 /*
1977 * Accept connection on control socket
1978 */
1979 memset(&addr, 0, sizeof(addr));
1980 addrlen = sizeof(addr);
1981 if ((newsock = accept(c->sock, (struct sockaddr*)&addr,
1982 &addrlen)) == -1) {
1983 error("%s accept: %s", __func__, strerror(errno));
Damien Millera6508752012-04-22 11:21:10 +10001984 if (errno == EMFILE || errno == ENFILE)
Darren Tuckerb759c9c2013-06-02 07:46:16 +10001985 c->notbefore = monotime() + 1;
Damien Millere1537f92010-01-26 13:26:22 +11001986 return;
1987 }
1988
1989 if (getpeereid(newsock, &euid, &egid) < 0) {
1990 error("%s getpeereid failed: %s", __func__,
1991 strerror(errno));
1992 close(newsock);
1993 return;
1994 }
1995 if ((euid != 0) && (getuid() != euid)) {
1996 error("multiplex uid mismatch: peer euid %u != uid %u",
1997 (u_int)euid, (u_int)getuid());
1998 close(newsock);
1999 return;
2000 }
2001 nc = channel_new("multiplex client", SSH_CHANNEL_MUX_CLIENT,
2002 newsock, newsock, -1, c->local_window_max,
2003 c->local_maxpacket, 0, "mux-control", 1);
2004 nc->mux_rcb = c->mux_rcb;
2005 debug3("%s: new mux channel %d fd %d", __func__,
2006 nc->self, nc->sock);
2007 /* establish state */
2008 nc->mux_rcb(nc);
2009 /* mux state transitions must not elicit protocol messages */
2010 nc->flags |= CHAN_LOCAL;
2011}
2012
Damien Miller8473dd82006-07-24 14:08:32 +10002013/* ARGSUSED */
Ben Lindstrombba81212001-06-25 05:01:22 +00002014static void
Damien Millerd62f2ca2006-03-26 13:57:41 +11002015channel_post_output_drain_13(Channel *c, fd_set *readset, fd_set *writeset)
Damien Millerb38eff82000-04-01 11:09:21 +10002016{
2017 int len;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002018
Damien Millerb38eff82000-04-01 11:09:21 +10002019 /* Send buffered output data to the socket. */
2020 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
2021 len = write(c->sock, buffer_ptr(&c->output),
2022 buffer_len(&c->output));
2023 if (len <= 0)
Damien Miller76765c02002-01-22 23:21:15 +11002024 buffer_clear(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +10002025 else
2026 buffer_consume(&c->output, len);
2027 }
2028}
2029
Ben Lindstrombba81212001-06-25 05:01:22 +00002030static void
Damien Miller33b13562000-04-04 14:38:59 +10002031channel_handler_init_20(void)
2032{
Damien Millerde6987c2002-01-22 23:20:40 +11002033 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10002034 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10002035 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002036 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Miller7acefbb2014-07-18 14:11:24 +10002037 channel_pre[SSH_CHANNEL_UNIX_LISTENER] = &channel_pre_listener;
2038 channel_pre[SSH_CHANNEL_RUNIX_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10002039 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002040 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002041 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002042 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millere1537f92010-01-26 13:26:22 +11002043 channel_pre[SSH_CHANNEL_MUX_LISTENER] = &channel_pre_listener;
2044 channel_pre[SSH_CHANNEL_MUX_CLIENT] = &channel_pre_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10002045
Damien Millerde6987c2002-01-22 23:20:40 +11002046 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Miller33b13562000-04-04 14:38:59 +10002047 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002048 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Miller7acefbb2014-07-18 14:11:24 +10002049 channel_post[SSH_CHANNEL_UNIX_LISTENER] = &channel_post_port_listener;
2050 channel_post[SSH_CHANNEL_RUNIX_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10002051 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11002052 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002053 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002054 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millere1537f92010-01-26 13:26:22 +11002055 channel_post[SSH_CHANNEL_MUX_LISTENER] = &channel_post_mux_listener;
2056 channel_post[SSH_CHANNEL_MUX_CLIENT] = &channel_post_mux_client;
Damien Miller33b13562000-04-04 14:38:59 +10002057}
2058
Ben Lindstrombba81212001-06-25 05:01:22 +00002059static void
Damien Millerb38eff82000-04-01 11:09:21 +10002060channel_handler_init_13(void)
2061{
2062 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
2063 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
2064 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2065 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2066 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
2067 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
2068 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002069 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002070 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10002071
Damien Millerde6987c2002-01-22 23:20:40 +11002072 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002073 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2074 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2075 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
2076 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002077 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002078 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002079}
2080
Ben Lindstrombba81212001-06-25 05:01:22 +00002081static void
Damien Millerb38eff82000-04-01 11:09:21 +10002082channel_handler_init_15(void)
2083{
Damien Millerde6987c2002-01-22 23:20:40 +11002084 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open;
Damien Millerbd483e72000-04-30 10:00:53 +10002085 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002086 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
2087 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
2088 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002089 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00002090 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10002091
2092 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
2093 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
2094 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Damien Millerde6987c2002-01-22 23:20:40 +11002095 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002096 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Damien Millerde6987c2002-01-22 23:20:40 +11002097 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open;
Damien Millerb38eff82000-04-01 11:09:21 +10002098}
2099
Ben Lindstrombba81212001-06-25 05:01:22 +00002100static void
Damien Millerb38eff82000-04-01 11:09:21 +10002101channel_handler_init(void)
2102{
2103 int i;
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00002104
Damien Miller9f0f5c62001-12-21 14:45:46 +11002105 for (i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
Damien Millerb38eff82000-04-01 11:09:21 +10002106 channel_pre[i] = NULL;
2107 channel_post[i] = NULL;
2108 }
Damien Miller33b13562000-04-04 14:38:59 +10002109 if (compat20)
2110 channel_handler_init_20();
2111 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10002112 channel_handler_init_13();
2113 else
2114 channel_handler_init_15();
2115}
2116
Damien Miller3ec27592001-10-12 11:35:04 +10002117/* gc dead channels */
2118static void
2119channel_garbage_collect(Channel *c)
2120{
2121 if (c == NULL)
2122 return;
2123 if (c->detach_user != NULL) {
Damien Miller39eda6e2005-11-05 14:52:50 +11002124 if (!chan_is_dead(c, c->detach_close))
Damien Miller3ec27592001-10-12 11:35:04 +10002125 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002126 debug2("channel %d: gc: notify user", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002127 c->detach_user(c->self, NULL);
2128 /* if we still have a callback */
2129 if (c->detach_user != NULL)
2130 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002131 debug2("channel %d: gc: user detached", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002132 }
2133 if (!chan_is_dead(c, 1))
2134 return;
Damien Millerfbdeece2003-09-02 22:52:31 +10002135 debug2("channel %d: garbage collecting", c->self);
Damien Miller3ec27592001-10-12 11:35:04 +10002136 channel_free(c);
2137}
2138
Ben Lindstrombba81212001-06-25 05:01:22 +00002139static void
Damien Millera6508752012-04-22 11:21:10 +10002140channel_handler(chan_fn *ftab[], fd_set *readset, fd_set *writeset,
2141 time_t *unpause_secs)
Damien Millerb38eff82000-04-01 11:09:21 +10002142{
2143 static int did_init = 0;
Darren Tucker876045b2010-01-08 17:08:00 +11002144 u_int i, oalloc;
Damien Millerb38eff82000-04-01 11:09:21 +10002145 Channel *c;
Damien Millera6508752012-04-22 11:21:10 +10002146 time_t now;
Damien Millerb38eff82000-04-01 11:09:21 +10002147
2148 if (!did_init) {
2149 channel_handler_init();
2150 did_init = 1;
2151 }
Darren Tuckerb759c9c2013-06-02 07:46:16 +10002152 now = monotime();
Damien Millera6508752012-04-22 11:21:10 +10002153 if (unpause_secs != NULL)
2154 *unpause_secs = 0;
Darren Tucker876045b2010-01-08 17:08:00 +11002155 for (i = 0, oalloc = channels_alloc; i < oalloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002156 c = channels[i];
2157 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10002158 continue;
Darren Tucker876045b2010-01-08 17:08:00 +11002159 if (c->delayed) {
2160 if (ftab == channel_pre)
2161 c->delayed = 0;
2162 else
2163 continue;
2164 }
Damien Millera6508752012-04-22 11:21:10 +10002165 if (ftab[c->type] != NULL) {
2166 /*
2167 * Run handlers that are not paused.
2168 */
2169 if (c->notbefore <= now)
2170 (*ftab[c->type])(c, readset, writeset);
2171 else if (unpause_secs != NULL) {
2172 /*
2173 * Collect the time that the earliest
2174 * channel comes off pause.
2175 */
2176 debug3("%s: chan %d: skip for %d more seconds",
2177 __func__, c->self,
2178 (int)(c->notbefore - now));
2179 if (*unpause_secs == 0 ||
2180 (c->notbefore - now) < *unpause_secs)
2181 *unpause_secs = c->notbefore - now;
2182 }
2183 }
Damien Miller3ec27592001-10-12 11:35:04 +10002184 channel_garbage_collect(c);
Damien Millerb38eff82000-04-01 11:09:21 +10002185 }
Damien Millera6508752012-04-22 11:21:10 +10002186 if (unpause_secs != NULL && *unpause_secs != 0)
2187 debug3("%s: first channel unpauses in %d seconds",
2188 __func__, (int)*unpause_secs);
Damien Millerb38eff82000-04-01 11:09:21 +10002189}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002190
Ben Lindstrome9c99912001-06-09 00:41:05 +00002191/*
2192 * Allocate/update select bitmasks and add any bits relevant to channels in
2193 * select bitmasks.
2194 */
Damien Miller4af51302000-04-16 11:18:38 +10002195void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002196channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Damien Millerba77e1f2012-04-23 18:21:05 +10002197 u_int *nallocp, time_t *minwait_secs, int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002198{
Damien Miller36812092006-03-26 14:22:47 +11002199 u_int n, sz, nfdset;
Damien Miller5e953212001-01-30 09:14:00 +11002200
2201 n = MAX(*maxfdp, channel_max_fd);
2202
Damien Miller36812092006-03-26 14:22:47 +11002203 nfdset = howmany(n+1, NFDBITS);
2204 /* Explicitly test here, because xrealloc isn't always called */
millert@openbsd.orgfd368342015-02-06 23:21:59 +00002205 if (nfdset && SIZE_MAX / nfdset < sizeof(fd_mask))
Damien Miller36812092006-03-26 14:22:47 +11002206 fatal("channel_prepare_select: max_fd (%d) is too large", n);
2207 sz = nfdset * sizeof(fd_mask);
2208
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002209 /* perhaps check sz < nalloc/2 and shrink? */
2210 if (*readsetp == NULL || sz > *nallocp) {
deraadt@openbsd.org657a5fb2015-04-24 01:36:00 +00002211 *readsetp = xreallocarray(*readsetp, nfdset, sizeof(fd_mask));
2212 *writesetp = xreallocarray(*writesetp, nfdset, sizeof(fd_mask));
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002213 *nallocp = sz;
Damien Miller5e953212001-01-30 09:14:00 +11002214 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +00002215 *maxfdp = n;
Damien Miller5e953212001-01-30 09:14:00 +11002216 memset(*readsetp, 0, sz);
2217 memset(*writesetp, 0, sz);
2218
Ben Lindstrombe2cc432001-04-04 23:46:07 +00002219 if (!rekeying)
Damien Millera6508752012-04-22 11:21:10 +10002220 channel_handler(channel_pre, *readsetp, *writesetp,
2221 minwait_secs);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002222}
2223
Ben Lindstrome9c99912001-06-09 00:41:05 +00002224/*
2225 * After select, perform any appropriate operations for channels which have
2226 * events pending.
2227 */
Damien Miller4af51302000-04-16 11:18:38 +10002228void
Damien Millerd62f2ca2006-03-26 13:57:41 +11002229channel_after_select(fd_set *readset, fd_set *writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002230{
Damien Millera6508752012-04-22 11:21:10 +10002231 channel_handler(channel_post, readset, writeset, NULL);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002232}
2233
Ben Lindstrome9c99912001-06-09 00:41:05 +00002234
Damien Miller5e953212001-01-30 09:14:00 +11002235/* If there is data to send to the connection, enqueue some of it now. */
Damien Miller4af51302000-04-16 11:18:38 +10002236void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00002237channel_output_poll(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002238{
Damien Millerb38eff82000-04-01 11:09:21 +10002239 Channel *c;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10002240 u_int i, len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002241
Damien Miller95def091999-11-25 00:26:21 +11002242 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002243 c = channels[i];
2244 if (c == NULL)
2245 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002246
Ben Lindstrome9c99912001-06-09 00:41:05 +00002247 /*
2248 * We are only interested in channels that can have buffered
2249 * incoming data.
2250 */
Damien Miller34132e52000-01-14 15:45:46 +11002251 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10002252 if (c->type != SSH_CHANNEL_OPEN &&
2253 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11002254 continue;
2255 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10002256 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11002257 continue;
Damien Miller34132e52000-01-14 15:45:46 +11002258 }
Damien Millerefb4afe2000-04-12 18:45:05 +10002259 if (compat20 &&
2260 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002261 /* XXX is this true? */
Damien Miller3ec27592001-10-12 11:35:04 +10002262 debug3("channel %d: will not send data after close", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10002263 continue;
2264 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002265
Damien Miller95def091999-11-25 00:26:21 +11002266 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002267 if ((c->istate == CHAN_INPUT_OPEN ||
2268 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
2269 (len = buffer_len(&c->input)) > 0) {
Damien Millerd27b9472005-12-13 19:29:02 +11002270 if (c->datagram) {
2271 if (len > 0) {
2272 u_char *data;
2273 u_int dlen;
2274
2275 data = buffer_get_string(&c->input,
2276 &dlen);
Damien Miller7d457182010-08-05 23:09:48 +10002277 if (dlen > c->remote_window ||
2278 dlen > c->remote_maxpacket) {
2279 debug("channel %d: datagram "
2280 "too big for channel",
2281 c->self);
Darren Tuckera627d422013-06-02 07:31:17 +10002282 free(data);
Damien Miller7d457182010-08-05 23:09:48 +10002283 continue;
2284 }
Damien Millerd27b9472005-12-13 19:29:02 +11002285 packet_start(SSH2_MSG_CHANNEL_DATA);
2286 packet_put_int(c->remote_id);
2287 packet_put_string(data, dlen);
2288 packet_send();
djm@openbsd.orgf715afe2015-06-30 05:23:25 +00002289 c->remote_window -= dlen;
Darren Tuckera627d422013-06-02 07:31:17 +10002290 free(data);
Damien Millerd27b9472005-12-13 19:29:02 +11002291 }
2292 continue;
2293 }
Ben Lindstrome9c99912001-06-09 00:41:05 +00002294 /*
2295 * Send some data for the other side over the secure
2296 * connection.
2297 */
Damien Miller33b13562000-04-04 14:38:59 +10002298 if (compat20) {
2299 if (len > c->remote_window)
2300 len = c->remote_window;
2301 if (len > c->remote_maxpacket)
2302 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11002303 } else {
Damien Miller33b13562000-04-04 14:38:59 +10002304 if (packet_is_interactive()) {
2305 if (len > 1024)
2306 len = 512;
2307 } else {
2308 /* Keep the packets at reasonable size. */
2309 if (len > packet_get_maxsize()/2)
2310 len = packet_get_maxsize()/2;
2311 }
Damien Miller95def091999-11-25 00:26:21 +11002312 }
Damien Millerb38eff82000-04-01 11:09:21 +10002313 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10002314 packet_start(compat20 ?
2315 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10002316 packet_put_int(c->remote_id);
2317 packet_put_string(buffer_ptr(&c->input), len);
2318 packet_send();
2319 buffer_consume(&c->input, len);
2320 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10002321 }
2322 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11002323 if (compat13)
2324 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11002325 /*
2326 * input-buffer is empty and read-socket shutdown:
Ben Lindstromcf159442002-03-26 03:26:24 +00002327 * tell peer, that we will not send more data: send IEOF.
2328 * hack for extended data: delay EOF if EFD still in use.
Damien Miller5428f641999-11-25 11:54:57 +11002329 */
Ben Lindstromcf159442002-03-26 03:26:24 +00002330 if (CHANNEL_EFD_INPUT_ACTIVE(c))
Damien Miller0dc1bef2005-07-17 17:22:45 +10002331 debug2("channel %d: ibuf_empty delayed efd %d/(%d)",
2332 c->self, c->efd, buffer_len(&c->extended));
Ben Lindstromcf159442002-03-26 03:26:24 +00002333 else
2334 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11002335 }
Damien Miller33b13562000-04-04 14:38:59 +10002336 /* Send extended data, i.e. stderr */
2337 if (compat20 &&
Ben Lindstromcf159442002-03-26 03:26:24 +00002338 !(c->flags & CHAN_EOF_SENT) &&
Damien Miller33b13562000-04-04 14:38:59 +10002339 c->remote_window > 0 &&
2340 (len = buffer_len(&c->extended)) > 0 &&
2341 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002342 debug2("channel %d: rwin %u elen %u euse %d",
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002343 c->self, c->remote_window, buffer_len(&c->extended),
2344 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10002345 if (len > c->remote_window)
2346 len = c->remote_window;
2347 if (len > c->remote_maxpacket)
2348 len = c->remote_maxpacket;
2349 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
2350 packet_put_int(c->remote_id);
2351 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
2352 packet_put_string(buffer_ptr(&c->extended), len);
2353 packet_send();
2354 buffer_consume(&c->extended, len);
2355 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00002356 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10002357 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002358 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002359}
2360
Ben Lindstrome9c99912001-06-09 00:41:05 +00002361
2362/* -- protocol input */
Damien Millerd79b4242006-03-31 23:11:44 +11002363
2364/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002365int
Damien Miller630d6f42002-01-22 23:17:30 +11002366channel_input_data(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002367{
Damien Miller34132e52000-01-14 15:45:46 +11002368 int id;
Damien Miller633de332014-05-15 13:48:26 +10002369 const u_char *data;
Damien Miller7d457182010-08-05 23:09:48 +10002370 u_int data_len, win_len;
Damien Millerb38eff82000-04-01 11:09:21 +10002371 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002372
Damien Miller95def091999-11-25 00:26:21 +11002373 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11002374 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10002375 c = channel_lookup(id);
2376 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11002377 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002378
Damien Miller95def091999-11-25 00:26:21 +11002379 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10002380 if (c->type != SSH_CHANNEL_OPEN &&
2381 c->type != SSH_CHANNEL_X11_OPEN)
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002382 return 0;
Damien Miller34132e52000-01-14 15:45:46 +11002383
Damien Miller95def091999-11-25 00:26:21 +11002384 /* Get the data. */
Damien Millerdb255ca2008-05-19 14:59:37 +10002385 data = packet_get_string_ptr(&data_len);
Damien Miller7d457182010-08-05 23:09:48 +10002386 win_len = data_len;
2387 if (c->datagram)
2388 win_len += 4; /* string length header */
Damien Millerb38eff82000-04-01 11:09:21 +10002389
Damien Millera04ad492004-01-21 11:02:09 +11002390 /*
2391 * Ignore data for protocol > 1.3 if output end is no longer open.
2392 * For protocol 2 the sending side is reducing its window as it sends
2393 * data, so we must 'fake' consumption of the data in order to ensure
2394 * that window updates are sent back. Otherwise the connection might
2395 * deadlock.
2396 */
2397 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN) {
2398 if (compat20) {
Damien Miller7d457182010-08-05 23:09:48 +10002399 c->local_window -= win_len;
2400 c->local_consumed += win_len;
Damien Millera04ad492004-01-21 11:02:09 +11002401 }
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002402 return 0;
Damien Millera04ad492004-01-21 11:02:09 +11002403 }
2404
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002405 if (compat20) {
Damien Miller7d457182010-08-05 23:09:48 +10002406 if (win_len > c->local_maxpacket) {
Damien Miller996acd22003-04-09 20:59:48 +10002407 logit("channel %d: rcvd big packet %d, maxpack %d",
Damien Miller7d457182010-08-05 23:09:48 +10002408 c->self, win_len, c->local_maxpacket);
Damien Miller33b13562000-04-04 14:38:59 +10002409 }
Damien Miller7d457182010-08-05 23:09:48 +10002410 if (win_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002411 logit("channel %d: rcvd too much data %d, win %d",
Damien Miller7d457182010-08-05 23:09:48 +10002412 c->self, win_len, c->local_window);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002413 return 0;
Damien Miller33b13562000-04-04 14:38:59 +10002414 }
Damien Miller7d457182010-08-05 23:09:48 +10002415 c->local_window -= win_len;
Damien Miller33b13562000-04-04 14:38:59 +10002416 }
Damien Millerd27b9472005-12-13 19:29:02 +11002417 if (c->datagram)
2418 buffer_put_string(&c->output, data, data_len);
2419 else
2420 buffer_append(&c->output, data, data_len);
Damien Millerdb255ca2008-05-19 14:59:37 +10002421 packet_check_eom();
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002422 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002423}
Ben Lindstrome9c99912001-06-09 00:41:05 +00002424
Damien Millerd79b4242006-03-31 23:11:44 +11002425/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002426int
Damien Miller630d6f42002-01-22 23:17:30 +11002427channel_input_extended_data(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002428{
2429 int id;
Damien Miller33b13562000-04-04 14:38:59 +10002430 char *data;
Ben Lindstromdaa21792002-06-25 23:15:30 +00002431 u_int data_len, tcode;
Damien Miller33b13562000-04-04 14:38:59 +10002432 Channel *c;
2433
2434 /* Get the channel number and verify it. */
2435 id = packet_get_int();
2436 c = channel_lookup(id);
2437
2438 if (c == NULL)
2439 packet_disconnect("Received extended_data for bad channel %d.", id);
2440 if (c->type != SSH_CHANNEL_OPEN) {
Damien Miller996acd22003-04-09 20:59:48 +10002441 logit("channel %d: ext data for non open", id);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002442 return 0;
Damien Miller33b13562000-04-04 14:38:59 +10002443 }
Ben Lindstromcf159442002-03-26 03:26:24 +00002444 if (c->flags & CHAN_EOF_RCVD) {
2445 if (datafellows & SSH_BUG_EXTEOF)
2446 debug("channel %d: accepting ext data after eof", id);
2447 else
2448 packet_disconnect("Received extended_data after EOF "
2449 "on channel %d.", id);
2450 }
Damien Miller33b13562000-04-04 14:38:59 +10002451 tcode = packet_get_int();
2452 if (c->efd == -1 ||
2453 c->extended_usage != CHAN_EXTENDED_WRITE ||
2454 tcode != SSH2_EXTENDED_DATA_STDERR) {
Damien Miller996acd22003-04-09 20:59:48 +10002455 logit("channel %d: bad ext data", c->self);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002456 return 0;
Damien Miller33b13562000-04-04 14:38:59 +10002457 }
2458 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +11002459 packet_check_eom();
Damien Miller33b13562000-04-04 14:38:59 +10002460 if (data_len > c->local_window) {
Damien Miller996acd22003-04-09 20:59:48 +10002461 logit("channel %d: rcvd too much extended_data %d, win %d",
Damien Miller33b13562000-04-04 14:38:59 +10002462 c->self, data_len, c->local_window);
Darren Tuckera627d422013-06-02 07:31:17 +10002463 free(data);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002464 return 0;
Damien Miller33b13562000-04-04 14:38:59 +10002465 }
Damien Millerd3444942000-09-30 14:20:03 +11002466 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10002467 c->local_window -= data_len;
2468 buffer_append(&c->extended, data, data_len);
Darren Tuckera627d422013-06-02 07:31:17 +10002469 free(data);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002470 return 0;
Damien Miller33b13562000-04-04 14:38:59 +10002471}
2472
Damien Millerd79b4242006-03-31 23:11:44 +11002473/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002474int
Damien Miller630d6f42002-01-22 23:17:30 +11002475channel_input_ieof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002476{
2477 int id;
2478 Channel *c;
2479
Damien Millerb38eff82000-04-01 11:09:21 +10002480 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002481 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002482 c = channel_lookup(id);
2483 if (c == NULL)
2484 packet_disconnect("Received ieof for nonexistent channel %d.", id);
2485 chan_rcvd_ieof(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002486
2487 /* XXX force input close */
Damien Millera90fc082002-01-22 23:19:38 +11002488 if (c->force_drain && c->istate == CHAN_INPUT_OPEN) {
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002489 debug("channel %d: FORCE input drain", c->self);
2490 c->istate = CHAN_INPUT_WAIT_DRAIN;
Damien Miller73f10742002-01-22 23:34:52 +11002491 if (buffer_len(&c->input) == 0)
2492 chan_ibuf_empty(c);
Ben Lindstrom944c4f02001-09-18 05:51:13 +00002493 }
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002494 return 0;
Damien Millerb38eff82000-04-01 11:09:21 +10002495}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002496
Damien Millerd79b4242006-03-31 23:11:44 +11002497/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002498int
Damien Miller630d6f42002-01-22 23:17:30 +11002499channel_input_close(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002500{
Damien Millerb38eff82000-04-01 11:09:21 +10002501 int id;
2502 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002503
Damien Millerb38eff82000-04-01 11:09:21 +10002504 id = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002505 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002506 c = channel_lookup(id);
2507 if (c == NULL)
2508 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11002509
2510 /*
2511 * Send a confirmation that we have closed the channel and no more
2512 * data is coming for it.
2513 */
Damien Miller95def091999-11-25 00:26:21 +11002514 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10002515 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11002516 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002517
Damien Miller5428f641999-11-25 11:54:57 +11002518 /*
2519 * If the channel is in closed state, we have sent a close request,
2520 * and the other side will eventually respond with a confirmation.
2521 * Thus, we cannot free the channel here, because then there would be
2522 * no-one to receive the confirmation. The channel gets freed when
2523 * the confirmation arrives.
2524 */
Damien Millerb38eff82000-04-01 11:09:21 +10002525 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11002526 /*
2527 * Not a closed channel - mark it as draining, which will
2528 * cause it to be freed later.
2529 */
Damien Miller76765c02002-01-22 23:21:15 +11002530 buffer_clear(&c->input);
Damien Millerb38eff82000-04-01 11:09:21 +10002531 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11002532 }
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002533 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002534}
2535
Damien Millerb38eff82000-04-01 11:09:21 +10002536/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Millerd79b4242006-03-31 23:11:44 +11002537/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002538int
Damien Miller630d6f42002-01-22 23:17:30 +11002539channel_input_oclose(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002540{
Damien Millerb38eff82000-04-01 11:09:21 +10002541 int id = packet_get_int();
2542 Channel *c = channel_lookup(id);
Damien Miller66823cd2002-01-22 23:11:38 +11002543
Damien Miller48b03fc2002-01-22 23:11:40 +11002544 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002545 if (c == NULL)
2546 packet_disconnect("Received oclose for nonexistent channel %d.", id);
2547 chan_rcvd_oclose(c);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002548 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002549}
2550
Damien Millerd79b4242006-03-31 23:11:44 +11002551/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002552int
Damien Miller630d6f42002-01-22 23:17:30 +11002553channel_input_close_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002554{
2555 int id = packet_get_int();
2556 Channel *c = channel_lookup(id);
2557
Damien Miller48b03fc2002-01-22 23:11:40 +11002558 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +10002559 if (c == NULL)
2560 packet_disconnect("Received close confirmation for "
2561 "out-of-range channel %d.", id);
Damien Miller36187092013-06-10 13:07:11 +10002562 if (c->type != SSH_CHANNEL_CLOSED && c->type != SSH_CHANNEL_ABANDONED)
Damien Millerb38eff82000-04-01 11:09:21 +10002563 packet_disconnect("Received close confirmation for "
2564 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002565 channel_free(c);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002566 return 0;
Damien Millerb38eff82000-04-01 11:09:21 +10002567}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002568
Damien Millerd79b4242006-03-31 23:11:44 +11002569/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002570int
Damien Miller630d6f42002-01-22 23:17:30 +11002571channel_input_open_confirmation(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002572{
Damien Millerb38eff82000-04-01 11:09:21 +10002573 int id, remote_id;
2574 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002575
Damien Millerb38eff82000-04-01 11:09:21 +10002576 id = packet_get_int();
2577 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002578
Damien Millerb38eff82000-04-01 11:09:21 +10002579 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2580 packet_disconnect("Received open confirmation for "
2581 "non-opening channel %d.", id);
2582 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11002583 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10002584 c->remote_id = remote_id;
2585 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002586
2587 if (compat20) {
2588 c->remote_window = packet_get_int();
2589 c->remote_maxpacket = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002590 if (c->open_confirm) {
Damien Millerd3444942000-09-30 14:20:03 +11002591 debug2("callback start");
Damien Millerd530f5f2010-05-21 14:57:10 +10002592 c->open_confirm(c->self, 1, c->open_confirm_ctx);
Damien Millerd3444942000-09-30 14:20:03 +11002593 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10002594 }
Damien Millerfbdeece2003-09-02 22:52:31 +10002595 debug2("channel %d: open confirm rwindow %u rmax %u", c->self,
Damien Miller33b13562000-04-04 14:38:59 +10002596 c->remote_window, c->remote_maxpacket);
2597 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002598 packet_check_eom();
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002599 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002600}
2601
Ben Lindstrombba81212001-06-25 05:01:22 +00002602static char *
Ben Lindstrom69128662001-05-08 20:07:39 +00002603reason2txt(int reason)
2604{
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00002605 switch (reason) {
Ben Lindstrom69128662001-05-08 20:07:39 +00002606 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
2607 return "administratively prohibited";
2608 case SSH2_OPEN_CONNECT_FAILED:
2609 return "connect failed";
2610 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
2611 return "unknown channel type";
2612 case SSH2_OPEN_RESOURCE_SHORTAGE:
2613 return "resource shortage";
2614 }
Ben Lindstrome2595442001-06-05 20:01:39 +00002615 return "unknown reason";
Ben Lindstrom69128662001-05-08 20:07:39 +00002616}
2617
Damien Millerd79b4242006-03-31 23:11:44 +11002618/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002619int
Damien Miller630d6f42002-01-22 23:17:30 +11002620channel_input_open_failure(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002621{
Kevin Steves12057502001-02-05 14:54:34 +00002622 int id, reason;
2623 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002624 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002625
Damien Millerb38eff82000-04-01 11:09:21 +10002626 id = packet_get_int();
2627 c = channel_lookup(id);
2628
2629 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
2630 packet_disconnect("Received open failure for "
2631 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10002632 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00002633 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00002634 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00002635 msg = packet_get_string(NULL);
2636 lang = packet_get_string(NULL);
2637 }
Damien Miller996acd22003-04-09 20:59:48 +10002638 logit("channel %d: open failed: %s%s%s", id,
Ben Lindstrom69128662001-05-08 20:07:39 +00002639 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Darren Tuckera627d422013-06-02 07:31:17 +10002640 free(msg);
2641 free(lang);
Damien Millerd530f5f2010-05-21 14:57:10 +10002642 if (c->open_confirm) {
2643 debug2("callback start");
2644 c->open_confirm(c->self, 0, c->open_confirm_ctx);
2645 debug2("callback done");
2646 }
Damien Miller33b13562000-04-04 14:38:59 +10002647 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002648 packet_check_eom();
Damien Miller7a606212009-01-28 16:22:34 +11002649 /* Schedule the channel for cleanup/deletion. */
2650 chan_mark_dead(c);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002651 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002652}
2653
Damien Millerd79b4242006-03-31 23:11:44 +11002654/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002655int
Damien Miller630d6f42002-01-22 23:17:30 +11002656channel_input_window_adjust(int type, u_int32_t seq, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10002657{
2658 Channel *c;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002659 int id;
djm@openbsd.org629df772015-06-30 05:25:07 +00002660 u_int adjust, tmp;
Damien Miller33b13562000-04-04 14:38:59 +10002661
2662 if (!compat20)
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002663 return 0;
Damien Miller33b13562000-04-04 14:38:59 +10002664
2665 /* Get the channel number and verify it. */
2666 id = packet_get_int();
2667 c = channel_lookup(id);
2668
Damien Millerd47c62a2005-12-13 19:33:57 +11002669 if (c == NULL) {
2670 logit("Received window adjust for non-open channel %d.", id);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002671 return 0;
Damien Miller33b13562000-04-04 14:38:59 +10002672 }
2673 adjust = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +11002674 packet_check_eom();
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00002675 debug2("channel %d: rcvd adjust %u", id, adjust);
djm@openbsd.org629df772015-06-30 05:25:07 +00002676 if ((tmp = c->remote_window + adjust) < c->remote_window)
2677 fatal("channel %d: adjust %u overflows remote window %u",
2678 id, adjust, c->remote_window);
2679 c->remote_window = tmp;
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002680 return 0;
Damien Miller33b13562000-04-04 14:38:59 +10002681}
2682
Damien Millerd79b4242006-03-31 23:11:44 +11002683/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002684int
Damien Miller630d6f42002-01-22 23:17:30 +11002685channel_input_port_open(int type, u_int32_t seq, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002686{
Ben Lindstrome9c99912001-06-09 00:41:05 +00002687 Channel *c = NULL;
2688 u_short host_port;
2689 char *host, *originator_string;
Damien Millerbd740252008-05-19 15:37:09 +10002690 int remote_id;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002691
Ben Lindstrome9c99912001-06-09 00:41:05 +00002692 remote_id = packet_get_int();
2693 host = packet_get_string(NULL);
2694 host_port = packet_get_int();
2695
2696 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
2697 originator_string = packet_get_string(NULL);
2698 } else {
2699 originator_string = xstrdup("unknown (remote did not supply name)");
2700 }
Damien Miller48b03fc2002-01-22 23:11:40 +11002701 packet_check_eom();
Damien Miller7acefbb2014-07-18 14:11:24 +10002702 c = channel_connect_to_port(host, host_port,
Damien Millerbd740252008-05-19 15:37:09 +10002703 "connected socket", originator_string);
Darren Tuckera627d422013-06-02 07:31:17 +10002704 free(originator_string);
2705 free(host);
Ben Lindstrome9c99912001-06-09 00:41:05 +00002706 if (c == NULL) {
2707 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2708 packet_put_int(remote_id);
2709 packet_send();
Damien Millerbd740252008-05-19 15:37:09 +10002710 } else
2711 c->remote_id = remote_id;
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002712 return 0;
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002713}
2714
Damien Millerb84886b2008-05-19 15:05:07 +10002715/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002716int
Damien Millerb84886b2008-05-19 15:05:07 +10002717channel_input_status_confirm(int type, u_int32_t seq, void *ctxt)
2718{
2719 Channel *c;
2720 struct channel_confirm *cc;
Damien Miller16a73072008-12-08 09:55:25 +11002721 int id;
Damien Millerb84886b2008-05-19 15:05:07 +10002722
2723 /* Reset keepalive timeout */
Darren Tuckerf7288d72009-06-21 18:12:20 +10002724 packet_set_alive_timeouts(0);
Damien Millerb84886b2008-05-19 15:05:07 +10002725
Damien Miller16a73072008-12-08 09:55:25 +11002726 id = packet_get_int();
Damien Millerb84886b2008-05-19 15:05:07 +10002727 packet_check_eom();
2728
Damien Miller16a73072008-12-08 09:55:25 +11002729 debug2("channel_input_status_confirm: type %d id %d", type, id);
Damien Millerb84886b2008-05-19 15:05:07 +10002730
Damien Miller16a73072008-12-08 09:55:25 +11002731 if ((c = channel_lookup(id)) == NULL) {
2732 logit("channel_input_status_confirm: %d: unknown", id);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002733 return 0;
Damien Millerb84886b2008-05-19 15:05:07 +10002734 }
Damien Millerb84886b2008-05-19 15:05:07 +10002735 if ((cc = TAILQ_FIRST(&c->status_confirms)) == NULL)
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002736 return 0;
Damien Millerb84886b2008-05-19 15:05:07 +10002737 cc->cb(type, c, cc->ctx);
2738 TAILQ_REMOVE(&c->status_confirms, cc, entry);
Damien Miller1d2c4562014-02-04 11:18:20 +11002739 explicit_bzero(cc, sizeof(*cc));
Darren Tuckera627d422013-06-02 07:31:17 +10002740 free(cc);
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00002741 return 0;
Damien Millerb84886b2008-05-19 15:05:07 +10002742}
Ben Lindstrom5744dc42001-04-13 23:28:01 +00002743
Ben Lindstrome9c99912001-06-09 00:41:05 +00002744/* -- tcp forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002745
Ben Lindstrom908afed2001-10-03 17:34:59 +00002746void
2747channel_set_af(int af)
2748{
2749 IPv4or6 = af;
2750}
2751
Damien Millerf6dff7c2011-09-22 21:38:52 +10002752
2753/*
2754 * Determine whether or not a port forward listens to loopback, the
2755 * specified address or wildcard. On the client, a specified bind
2756 * address will always override gateway_ports. On the server, a
2757 * gateway_ports of 1 (``yes'') will override the client's specification
2758 * and force a wildcard bind, whereas a value of 2 (``clientspecified'')
2759 * will bind to whatever address the client asked for.
2760 *
2761 * Special-case listen_addrs are:
2762 *
2763 * "0.0.0.0" -> wildcard v4/v6 if SSH_OLD_FORWARD_ADDR
2764 * "" (empty string), "*" -> wildcard v4/v6
2765 * "localhost" -> loopback v4/v6
Damien Miller602943d2014-07-04 08:59:41 +10002766 * "127.0.0.1" / "::1" -> accepted even if gateway_ports isn't set
Damien Millerf6dff7c2011-09-22 21:38:52 +10002767 */
2768static const char *
2769channel_fwd_bind_addr(const char *listen_addr, int *wildcardp,
Damien Miller7acefbb2014-07-18 14:11:24 +10002770 int is_client, struct ForwardOptions *fwd_opts)
Damien Millerf6dff7c2011-09-22 21:38:52 +10002771{
2772 const char *addr = NULL;
2773 int wildcard = 0;
2774
2775 if (listen_addr == NULL) {
2776 /* No address specified: default to gateway_ports setting */
Damien Miller7acefbb2014-07-18 14:11:24 +10002777 if (fwd_opts->gateway_ports)
Damien Millerf6dff7c2011-09-22 21:38:52 +10002778 wildcard = 1;
Damien Miller7acefbb2014-07-18 14:11:24 +10002779 } else if (fwd_opts->gateway_ports || is_client) {
Damien Millerf6dff7c2011-09-22 21:38:52 +10002780 if (((datafellows & SSH_OLD_FORWARD_ADDR) &&
2781 strcmp(listen_addr, "0.0.0.0") == 0 && is_client == 0) ||
2782 *listen_addr == '\0' || strcmp(listen_addr, "*") == 0 ||
Damien Miller7acefbb2014-07-18 14:11:24 +10002783 (!is_client && fwd_opts->gateway_ports == 1)) {
Damien Millerf6dff7c2011-09-22 21:38:52 +10002784 wildcard = 1;
Darren Tucker71152bc2013-10-10 10:27:21 +11002785 /*
2786 * Notify client if they requested a specific listen
2787 * address and it was overridden.
2788 */
2789 if (*listen_addr != '\0' &&
2790 strcmp(listen_addr, "0.0.0.0") != 0 &&
2791 strcmp(listen_addr, "*") != 0) {
2792 packet_send_debug("Forwarding listen address "
2793 "\"%s\" overridden by server "
2794 "GatewayPorts", listen_addr);
2795 }
Damien Miller602943d2014-07-04 08:59:41 +10002796 } else if (strcmp(listen_addr, "localhost") != 0 ||
2797 strcmp(listen_addr, "127.0.0.1") == 0 ||
2798 strcmp(listen_addr, "::1") == 0) {
2799 /* Accept localhost address when GatewayPorts=yes */
Damien Millere84d1032014-05-21 17:13:36 +10002800 addr = listen_addr;
Damien Miller602943d2014-07-04 08:59:41 +10002801 }
2802 } else if (strcmp(listen_addr, "127.0.0.1") == 0 ||
2803 strcmp(listen_addr, "::1") == 0) {
2804 /*
2805 * If a specific IPv4/IPv6 localhost address has been
2806 * requested then accept it even if gateway_ports is in
2807 * effect. This allows the client to prefer IPv4 or IPv6.
2808 */
2809 addr = listen_addr;
Damien Millerf6dff7c2011-09-22 21:38:52 +10002810 }
2811 if (wildcardp != NULL)
2812 *wildcardp = wildcard;
2813 return addr;
2814}
2815
Damien Millerb16461c2002-01-22 23:29:22 +11002816static int
Damien Miller7acefbb2014-07-18 14:11:24 +10002817channel_setup_fwd_listener_tcpip(int type, struct Forward *fwd,
2818 int *allocated_listen_port, struct ForwardOptions *fwd_opts)
Damien Miller0bc1bd82000-11-13 22:57:25 +11002819{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002820 Channel *c;
Damien Miller5e7fd072005-11-05 14:53:39 +11002821 int sock, r, success = 0, wildcard = 0, is_client;
Damien Miller34132e52000-01-14 15:45:46 +11002822 struct addrinfo hints, *ai, *aitop;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002823 const char *host, *addr;
Damien Millerb16461c2002-01-22 23:29:22 +11002824 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller4bf648f2009-02-14 16:28:21 +11002825 in_port_t *lport_p;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002826
Damien Millerf91ee4c2005-03-01 21:24:33 +11002827 is_client = (type == SSH_CHANNEL_PORT_LISTENER);
Kevin Steves12057502001-02-05 14:54:34 +00002828
millert@openbsd.orgec04dc42015-06-05 15:13:13 +00002829 if (is_client && fwd->connect_path != NULL) {
2830 host = fwd->connect_path;
2831 } else {
2832 host = (type == SSH_CHANNEL_RPORT_LISTENER) ?
2833 fwd->listen_host : fwd->connect_host;
2834 if (host == NULL) {
2835 error("No forward host name.");
2836 return 0;
2837 }
2838 if (strlen(host) >= NI_MAXHOST) {
2839 error("Forward host name too long.");
2840 return 0;
2841 }
Kevin Steves12057502001-02-05 14:54:34 +00002842 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002843
Damien Millerf6dff7c2011-09-22 21:38:52 +10002844 /* Determine the bind address, cf. channel_fwd_bind_addr() comment */
Damien Miller7acefbb2014-07-18 14:11:24 +10002845 addr = channel_fwd_bind_addr(fwd->listen_host, &wildcard,
2846 is_client, fwd_opts);
2847 debug3("%s: type %d wildcard %d addr %s", __func__,
Damien Millerf91ee4c2005-03-01 21:24:33 +11002848 type, wildcard, (addr == NULL) ? "NULL" : addr);
2849
2850 /*
Damien Miller34132e52000-01-14 15:45:46 +11002851 * getaddrinfo returns a loopback address if the hostname is
2852 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11002853 */
Damien Miller34132e52000-01-14 15:45:46 +11002854 memset(&hints, 0, sizeof(hints));
2855 hints.ai_family = IPv4or6;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002856 hints.ai_flags = wildcard ? AI_PASSIVE : 0;
Damien Miller34132e52000-01-14 15:45:46 +11002857 hints.ai_socktype = SOCK_STREAM;
Damien Miller7acefbb2014-07-18 14:11:24 +10002858 snprintf(strport, sizeof strport, "%d", fwd->listen_port);
Damien Millerf91ee4c2005-03-01 21:24:33 +11002859 if ((r = getaddrinfo(addr, strport, &hints, &aitop)) != 0) {
2860 if (addr == NULL) {
2861 /* This really shouldn't happen */
2862 packet_disconnect("getaddrinfo: fatal error: %s",
Darren Tucker4abde772007-12-29 02:43:51 +11002863 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002864 } else {
Damien Miller7acefbb2014-07-18 14:11:24 +10002865 error("%s: getaddrinfo(%.64s): %s", __func__, addr,
Darren Tucker4abde772007-12-29 02:43:51 +11002866 ssh_gai_strerror(r));
Damien Millerf91ee4c2005-03-01 21:24:33 +11002867 }
Damien Millera7270302005-07-06 09:36:05 +10002868 return 0;
Damien Millerf91ee4c2005-03-01 21:24:33 +11002869 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002870 if (allocated_listen_port != NULL)
2871 *allocated_listen_port = 0;
Damien Miller34132e52000-01-14 15:45:46 +11002872 for (ai = aitop; ai; ai = ai->ai_next) {
Damien Miller4bf648f2009-02-14 16:28:21 +11002873 switch (ai->ai_family) {
2874 case AF_INET:
2875 lport_p = &((struct sockaddr_in *)ai->ai_addr)->
2876 sin_port;
2877 break;
2878 case AF_INET6:
2879 lport_p = &((struct sockaddr_in6 *)ai->ai_addr)->
2880 sin6_port;
2881 break;
2882 default:
Damien Miller34132e52000-01-14 15:45:46 +11002883 continue;
Damien Miller4bf648f2009-02-14 16:28:21 +11002884 }
2885 /*
2886 * If allocating a port for -R forwards, then use the
2887 * same port for all address families.
2888 */
Damien Miller7acefbb2014-07-18 14:11:24 +10002889 if (type == SSH_CHANNEL_RPORT_LISTENER && fwd->listen_port == 0 &&
Damien Miller4bf648f2009-02-14 16:28:21 +11002890 allocated_listen_port != NULL && *allocated_listen_port > 0)
2891 *lport_p = htons(*allocated_listen_port);
2892
Damien Miller34132e52000-01-14 15:45:46 +11002893 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2894 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Miller7acefbb2014-07-18 14:11:24 +10002895 error("%s: getnameinfo failed", __func__);
Damien Miller34132e52000-01-14 15:45:46 +11002896 continue;
2897 }
2898 /* Create a port to listen for the host. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11002899 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11002900 if (sock < 0) {
2901 /* this is no error since kernel may not support ipv6 */
2902 verbose("socket: %.100s", strerror(errno));
2903 continue;
2904 }
Damien Miller5e7fd072005-11-05 14:53:39 +11002905
2906 channel_set_reuseaddr(sock);
Damien Miller04ee0f82009-11-18 17:48:30 +11002907 if (ai->ai_family == AF_INET6)
2908 sock_set_v6only(sock);
Damien Millere1383ce2002-09-19 11:49:37 +10002909
Damien Miller4bf648f2009-02-14 16:28:21 +11002910 debug("Local forwarding listening on %s port %s.",
2911 ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11002912
Damien Miller34132e52000-01-14 15:45:46 +11002913 /* Bind the socket to the address. */
2914 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2915 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11002916 if (!ai->ai_next)
2917 error("bind: %.100s", strerror(errno));
2918 else
2919 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00002920
Damien Miller34132e52000-01-14 15:45:46 +11002921 close(sock);
2922 continue;
2923 }
2924 /* Start listening for connections on the socket. */
Darren Tucker3175eb92003-12-09 19:15:11 +11002925 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11002926 error("listen: %.100s", strerror(errno));
2927 close(sock);
2928 continue;
2929 }
Damien Miller4bf648f2009-02-14 16:28:21 +11002930
2931 /*
Damien Miller7acefbb2014-07-18 14:11:24 +10002932 * fwd->listen_port == 0 requests a dynamically allocated port -
Damien Miller4bf648f2009-02-14 16:28:21 +11002933 * record what we got.
2934 */
Damien Miller7acefbb2014-07-18 14:11:24 +10002935 if (type == SSH_CHANNEL_RPORT_LISTENER && fwd->listen_port == 0 &&
Damien Miller4bf648f2009-02-14 16:28:21 +11002936 allocated_listen_port != NULL &&
2937 *allocated_listen_port == 0) {
djm@openbsd.org95767262016-03-07 19:02:43 +00002938 *allocated_listen_port = get_local_port(sock);
Damien Miller4bf648f2009-02-14 16:28:21 +11002939 debug("Allocated listen port %d",
2940 *allocated_listen_port);
2941 }
2942
Damien Miller34132e52000-01-14 15:45:46 +11002943 /* Allocate a channel number for the socket. */
Ben Lindstrome9c99912001-06-09 00:41:05 +00002944 c = channel_new("port listener", type, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10002945 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10002946 0, "port listener", 1);
Damien Millera1c1b6c2009-01-28 16:29:49 +11002947 c->path = xstrdup(host);
Damien Miller7acefbb2014-07-18 14:11:24 +10002948 c->host_port = fwd->connect_port;
Damien Millerf6dff7c2011-09-22 21:38:52 +10002949 c->listening_addr = addr == NULL ? NULL : xstrdup(addr);
Damien Miller7acefbb2014-07-18 14:11:24 +10002950 if (fwd->listen_port == 0 && allocated_listen_port != NULL &&
Darren Tucker68afb8c2011-10-02 18:59:03 +11002951 !(datafellows & SSH_BUG_DYNAMIC_RPORT))
2952 c->listening_port = *allocated_listen_port;
2953 else
Damien Miller7acefbb2014-07-18 14:11:24 +10002954 c->listening_port = fwd->listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11002955 success = 1;
2956 }
2957 if (success == 0)
Damien Miller7acefbb2014-07-18 14:11:24 +10002958 error("%s: cannot listen to port: %d", __func__,
2959 fwd->listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11002960 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00002961 return success;
Damien Miller95def091999-11-25 00:26:21 +11002962}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002963
Damien Miller7acefbb2014-07-18 14:11:24 +10002964static int
2965channel_setup_fwd_listener_streamlocal(int type, struct Forward *fwd,
2966 struct ForwardOptions *fwd_opts)
2967{
2968 struct sockaddr_un sunaddr;
2969 const char *path;
2970 Channel *c;
2971 int port, sock;
2972 mode_t omask;
2973
2974 switch (type) {
2975 case SSH_CHANNEL_UNIX_LISTENER:
2976 if (fwd->connect_path != NULL) {
2977 if (strlen(fwd->connect_path) > sizeof(sunaddr.sun_path)) {
2978 error("Local connecting path too long: %s",
2979 fwd->connect_path);
2980 return 0;
2981 }
2982 path = fwd->connect_path;
2983 port = PORT_STREAMLOCAL;
2984 } else {
2985 if (fwd->connect_host == NULL) {
2986 error("No forward host name.");
2987 return 0;
2988 }
2989 if (strlen(fwd->connect_host) >= NI_MAXHOST) {
2990 error("Forward host name too long.");
2991 return 0;
2992 }
2993 path = fwd->connect_host;
2994 port = fwd->connect_port;
2995 }
2996 break;
2997 case SSH_CHANNEL_RUNIX_LISTENER:
2998 path = fwd->listen_path;
2999 port = PORT_STREAMLOCAL;
3000 break;
3001 default:
3002 error("%s: unexpected channel type %d", __func__, type);
3003 return 0;
3004 }
3005
3006 if (fwd->listen_path == NULL) {
3007 error("No forward path name.");
3008 return 0;
3009 }
3010 if (strlen(fwd->listen_path) > sizeof(sunaddr.sun_path)) {
3011 error("Local listening path too long: %s", fwd->listen_path);
3012 return 0;
3013 }
3014
3015 debug3("%s: type %d path %s", __func__, type, fwd->listen_path);
3016
3017 /* Start a Unix domain listener. */
3018 omask = umask(fwd_opts->streamlocal_bind_mask);
3019 sock = unix_listener(fwd->listen_path, SSH_LISTEN_BACKLOG,
3020 fwd_opts->streamlocal_bind_unlink);
3021 umask(omask);
3022 if (sock < 0)
3023 return 0;
3024
3025 debug("Local forwarding listening on path %s.", fwd->listen_path);
3026
3027 /* Allocate a channel number for the socket. */
3028 c = channel_new("unix listener", type, sock, sock, -1,
3029 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
3030 0, "unix listener", 1);
3031 c->path = xstrdup(path);
3032 c->host_port = port;
3033 c->listening_port = PORT_STREAMLOCAL;
3034 c->listening_addr = xstrdup(fwd->listen_path);
3035 return 1;
3036}
3037
3038static int
3039channel_cancel_rport_listener_tcpip(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10003040{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10003041 u_int i;
3042 int found = 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10003043
Darren Tucker47eede72005-03-14 23:08:12 +11003044 for (i = 0; i < channels_alloc; i++) {
Darren Tuckere7066df2004-05-24 10:18:05 +10003045 Channel *c = channels[i];
Damien Millerf6dff7c2011-09-22 21:38:52 +10003046 if (c == NULL || c->type != SSH_CHANNEL_RPORT_LISTENER)
3047 continue;
3048 if (strcmp(c->path, host) == 0 && c->listening_port == port) {
3049 debug2("%s: close channel %d", __func__, i);
3050 channel_free(c);
3051 found = 1;
3052 }
3053 }
Darren Tuckere7066df2004-05-24 10:18:05 +10003054
Damien Millerf6dff7c2011-09-22 21:38:52 +10003055 return (found);
3056}
3057
Damien Miller7acefbb2014-07-18 14:11:24 +10003058static int
3059channel_cancel_rport_listener_streamlocal(const char *path)
Damien Millerf6dff7c2011-09-22 21:38:52 +10003060{
3061 u_int i;
3062 int found = 0;
Damien Miller7acefbb2014-07-18 14:11:24 +10003063
3064 for (i = 0; i < channels_alloc; i++) {
3065 Channel *c = channels[i];
3066 if (c == NULL || c->type != SSH_CHANNEL_RUNIX_LISTENER)
3067 continue;
3068 if (c->path == NULL)
3069 continue;
3070 if (strcmp(c->path, path) == 0) {
3071 debug2("%s: close channel %d", __func__, i);
3072 channel_free(c);
3073 found = 1;
3074 }
3075 }
3076
3077 return (found);
3078}
3079
3080int
3081channel_cancel_rport_listener(struct Forward *fwd)
3082{
3083 if (fwd->listen_path != NULL)
3084 return channel_cancel_rport_listener_streamlocal(fwd->listen_path);
3085 else
3086 return channel_cancel_rport_listener_tcpip(fwd->listen_host, fwd->listen_port);
3087}
3088
3089static int
3090channel_cancel_lport_listener_tcpip(const char *lhost, u_short lport,
3091 int cport, struct ForwardOptions *fwd_opts)
3092{
3093 u_int i;
3094 int found = 0;
3095 const char *addr = channel_fwd_bind_addr(lhost, NULL, 1, fwd_opts);
Damien Millerf6dff7c2011-09-22 21:38:52 +10003096
3097 for (i = 0; i < channels_alloc; i++) {
3098 Channel *c = channels[i];
3099 if (c == NULL || c->type != SSH_CHANNEL_PORT_LISTENER)
3100 continue;
Damien Millerff773642011-09-22 21:39:48 +10003101 if (c->listening_port != lport)
Damien Millerf6dff7c2011-09-22 21:38:52 +10003102 continue;
Damien Millerff773642011-09-22 21:39:48 +10003103 if (cport == CHANNEL_CANCEL_PORT_STATIC) {
3104 /* skip dynamic forwardings */
3105 if (c->host_port == 0)
3106 continue;
3107 } else {
3108 if (c->host_port != cport)
3109 continue;
3110 }
Damien Millerf6dff7c2011-09-22 21:38:52 +10003111 if ((c->listening_addr == NULL && addr != NULL) ||
3112 (c->listening_addr != NULL && addr == NULL))
3113 continue;
3114 if (addr == NULL || strcmp(c->listening_addr, addr) == 0) {
Darren Tuckere6ed8392004-08-29 16:29:44 +10003115 debug2("%s: close channel %d", __func__, i);
Darren Tuckere7066df2004-05-24 10:18:05 +10003116 channel_free(c);
3117 found = 1;
3118 }
3119 }
3120
3121 return (found);
3122}
3123
Damien Miller7acefbb2014-07-18 14:11:24 +10003124static int
3125channel_cancel_lport_listener_streamlocal(const char *path)
3126{
3127 u_int i;
3128 int found = 0;
3129
3130 if (path == NULL) {
3131 error("%s: no path specified.", __func__);
3132 return 0;
3133 }
3134
3135 for (i = 0; i < channels_alloc; i++) {
3136 Channel *c = channels[i];
3137 if (c == NULL || c->type != SSH_CHANNEL_UNIX_LISTENER)
3138 continue;
3139 if (c->listening_addr == NULL)
3140 continue;
3141 if (strcmp(c->listening_addr, path) == 0) {
3142 debug2("%s: close channel %d", __func__, i);
3143 channel_free(c);
3144 found = 1;
3145 }
3146 }
3147
3148 return (found);
3149}
3150
3151int
3152channel_cancel_lport_listener(struct Forward *fwd, int cport, struct ForwardOptions *fwd_opts)
3153{
3154 if (fwd->listen_path != NULL)
3155 return channel_cancel_lport_listener_streamlocal(fwd->listen_path);
3156 else
3157 return channel_cancel_lport_listener_tcpip(fwd->listen_host, fwd->listen_port, cport, fwd_opts);
3158}
3159
Damien Millerb16461c2002-01-22 23:29:22 +11003160/* protocol local port fwd, used by ssh (and sshd in v1) */
3161int
Damien Miller7acefbb2014-07-18 14:11:24 +10003162channel_setup_local_fwd_listener(struct Forward *fwd, struct ForwardOptions *fwd_opts)
Damien Millerb16461c2002-01-22 23:29:22 +11003163{
Damien Miller7acefbb2014-07-18 14:11:24 +10003164 if (fwd->listen_path != NULL) {
3165 return channel_setup_fwd_listener_streamlocal(
3166 SSH_CHANNEL_UNIX_LISTENER, fwd, fwd_opts);
3167 } else {
3168 return channel_setup_fwd_listener_tcpip(SSH_CHANNEL_PORT_LISTENER,
3169 fwd, NULL, fwd_opts);
3170 }
Damien Millerb16461c2002-01-22 23:29:22 +11003171}
3172
3173/* protocol v2 remote port fwd, used by sshd */
3174int
Damien Miller7acefbb2014-07-18 14:11:24 +10003175channel_setup_remote_fwd_listener(struct Forward *fwd,
3176 int *allocated_listen_port, struct ForwardOptions *fwd_opts)
Damien Millerb16461c2002-01-22 23:29:22 +11003177{
Damien Miller7acefbb2014-07-18 14:11:24 +10003178 if (fwd->listen_path != NULL) {
3179 return channel_setup_fwd_listener_streamlocal(
3180 SSH_CHANNEL_RUNIX_LISTENER, fwd, fwd_opts);
3181 } else {
3182 return channel_setup_fwd_listener_tcpip(
3183 SSH_CHANNEL_RPORT_LISTENER, fwd, allocated_listen_port,
3184 fwd_opts);
3185 }
Damien Millerb16461c2002-01-22 23:29:22 +11003186}
3187
Damien Miller5428f641999-11-25 11:54:57 +11003188/*
Damien Millerf6dff7c2011-09-22 21:38:52 +10003189 * Translate the requested rfwd listen host to something usable for
3190 * this server.
3191 */
3192static const char *
3193channel_rfwd_bind_host(const char *listen_host)
3194{
3195 if (listen_host == NULL) {
3196 if (datafellows & SSH_BUG_RFWD_ADDR)
3197 return "127.0.0.1";
3198 else
3199 return "localhost";
3200 } else if (*listen_host == '\0' || strcmp(listen_host, "*") == 0) {
3201 if (datafellows & SSH_BUG_RFWD_ADDR)
3202 return "0.0.0.0";
3203 else
3204 return "";
3205 } else
3206 return listen_host;
3207}
3208
3209/*
Damien Miller5428f641999-11-25 11:54:57 +11003210 * Initiate forwarding of connections to port "port" on remote host through
3211 * the secure channel to host:port from local side.
Darren Tucker68afb8c2011-10-02 18:59:03 +11003212 * Returns handle (index) for updating the dynamic listen port with
3213 * channel_update_permitted_opens().
Damien Miller5428f641999-11-25 11:54:57 +11003214 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10003215int
Damien Miller7acefbb2014-07-18 14:11:24 +10003216channel_request_remote_forwarding(struct Forward *fwd)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003217{
Darren Tucker68afb8c2011-10-02 18:59:03 +11003218 int type, success = 0, idx = -1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11003219
Damien Miller95def091999-11-25 00:26:21 +11003220 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10003221 if (compat20) {
Damien Miller33b13562000-04-04 14:38:59 +10003222 packet_start(SSH2_MSG_GLOBAL_REQUEST);
Damien Miller7acefbb2014-07-18 14:11:24 +10003223 if (fwd->listen_path != NULL) {
3224 packet_put_cstring("streamlocal-forward@openssh.com");
3225 packet_put_char(1); /* boolean: want reply */
3226 packet_put_cstring(fwd->listen_path);
3227 } else {
3228 packet_put_cstring("tcpip-forward");
3229 packet_put_char(1); /* boolean: want reply */
3230 packet_put_cstring(channel_rfwd_bind_host(fwd->listen_host));
3231 packet_put_int(fwd->listen_port);
3232 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11003233 packet_send();
3234 packet_write_wait();
3235 /* Assume that server accepts the request */
3236 success = 1;
Damien Miller7acefbb2014-07-18 14:11:24 +10003237 } else if (fwd->listen_path == NULL) {
Damien Miller33b13562000-04-04 14:38:59 +10003238 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller7acefbb2014-07-18 14:11:24 +10003239 packet_put_int(fwd->listen_port);
3240 packet_put_cstring(fwd->connect_host);
3241 packet_put_int(fwd->connect_port);
Damien Miller33b13562000-04-04 14:38:59 +10003242 packet_send();
3243 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11003244
3245 /* Wait for response from the remote side. */
Damien Millerdff50992002-01-22 23:16:32 +11003246 type = packet_read();
Damien Miller0bc1bd82000-11-13 22:57:25 +11003247 switch (type) {
3248 case SSH_SMSG_SUCCESS:
3249 success = 1;
3250 break;
3251 case SSH_SMSG_FAILURE:
Damien Miller0bc1bd82000-11-13 22:57:25 +11003252 break;
3253 default:
3254 /* Unknown packet */
3255 packet_disconnect("Protocol error for port forward request:"
3256 "received packet type %d.", type);
3257 }
Damien Miller7acefbb2014-07-18 14:11:24 +10003258 } else {
3259 logit("Warning: Server does not support remote stream local forwarding.");
Damien Miller0bc1bd82000-11-13 22:57:25 +11003260 }
3261 if (success) {
Damien Miller232cfb12010-06-26 09:50:30 +10003262 /* Record that connection to this host/port is permitted. */
deraadt@openbsd.org657a5fb2015-04-24 01:36:00 +00003263 permitted_opens = xreallocarray(permitted_opens,
Damien Miller232cfb12010-06-26 09:50:30 +10003264 num_permitted_opens + 1, sizeof(*permitted_opens));
Darren Tucker68afb8c2011-10-02 18:59:03 +11003265 idx = num_permitted_opens++;
Damien Miller7acefbb2014-07-18 14:11:24 +10003266 if (fwd->connect_path != NULL) {
3267 permitted_opens[idx].host_to_connect =
3268 xstrdup(fwd->connect_path);
3269 permitted_opens[idx].port_to_connect =
3270 PORT_STREAMLOCAL;
3271 } else {
3272 permitted_opens[idx].host_to_connect =
3273 xstrdup(fwd->connect_host);
3274 permitted_opens[idx].port_to_connect =
3275 fwd->connect_port;
3276 }
3277 if (fwd->listen_path != NULL) {
3278 permitted_opens[idx].listen_host = NULL;
3279 permitted_opens[idx].listen_path =
3280 xstrdup(fwd->listen_path);
3281 permitted_opens[idx].listen_port = PORT_STREAMLOCAL;
3282 } else {
3283 permitted_opens[idx].listen_host =
3284 fwd->listen_host ? xstrdup(fwd->listen_host) : NULL;
3285 permitted_opens[idx].listen_path = NULL;
3286 permitted_opens[idx].listen_port = fwd->listen_port;
3287 }
Damien Miller33b13562000-04-04 14:38:59 +10003288 }
Darren Tucker68afb8c2011-10-02 18:59:03 +11003289 return (idx);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003290}
3291
Damien Miller4b3ed642014-07-02 15:29:40 +10003292static int
3293open_match(ForwardPermission *allowed_open, const char *requestedhost,
Damien Miller7acefbb2014-07-18 14:11:24 +10003294 int requestedport)
Damien Miller4b3ed642014-07-02 15:29:40 +10003295{
3296 if (allowed_open->host_to_connect == NULL)
3297 return 0;
3298 if (allowed_open->port_to_connect != FWD_PERMIT_ANY_PORT &&
3299 allowed_open->port_to_connect != requestedport)
3300 return 0;
3301 if (strcmp(allowed_open->host_to_connect, requestedhost) != 0)
3302 return 0;
3303 return 1;
3304}
3305
3306/*
Damien Miller7acefbb2014-07-18 14:11:24 +10003307 * Note that in the listen host/port case
Damien Miller4b3ed642014-07-02 15:29:40 +10003308 * we don't support FWD_PERMIT_ANY_PORT and
3309 * need to translate between the configured-host (listen_host)
3310 * and what we've sent to the remote server (channel_rfwd_bind_host)
3311 */
3312static int
Damien Miller7acefbb2014-07-18 14:11:24 +10003313open_listen_match_tcpip(ForwardPermission *allowed_open,
3314 const char *requestedhost, u_short requestedport, int translate)
Damien Miller4b3ed642014-07-02 15:29:40 +10003315{
3316 const char *allowed_host;
3317
3318 if (allowed_open->host_to_connect == NULL)
3319 return 0;
3320 if (allowed_open->listen_port != requestedport)
3321 return 0;
Damien Miller3a48cc02014-07-06 09:32:49 +10003322 if (!translate && allowed_open->listen_host == NULL &&
3323 requestedhost == NULL)
3324 return 1;
Damien Miller4b3ed642014-07-02 15:29:40 +10003325 allowed_host = translate ?
3326 channel_rfwd_bind_host(allowed_open->listen_host) :
3327 allowed_open->listen_host;
3328 if (allowed_host == NULL ||
3329 strcmp(allowed_host, requestedhost) != 0)
3330 return 0;
3331 return 1;
3332}
3333
Damien Miller7acefbb2014-07-18 14:11:24 +10003334static int
3335open_listen_match_streamlocal(ForwardPermission *allowed_open,
3336 const char *requestedpath)
3337{
3338 if (allowed_open->host_to_connect == NULL)
3339 return 0;
3340 if (allowed_open->listen_port != PORT_STREAMLOCAL)
3341 return 0;
3342 if (allowed_open->listen_path == NULL ||
3343 strcmp(allowed_open->listen_path, requestedpath) != 0)
3344 return 0;
3345 return 1;
3346}
3347
Damien Miller5428f641999-11-25 11:54:57 +11003348/*
Darren Tuckerfc959702004-07-17 16:12:08 +10003349 * Request cancellation of remote forwarding of connection host:port from
Darren Tuckere7066df2004-05-24 10:18:05 +10003350 * local side.
3351 */
Damien Miller7acefbb2014-07-18 14:11:24 +10003352static int
3353channel_request_rforward_cancel_tcpip(const char *host, u_short port)
Darren Tuckere7066df2004-05-24 10:18:05 +10003354{
3355 int i;
Darren Tuckere7066df2004-05-24 10:18:05 +10003356
3357 if (!compat20)
Damien Millerf6dff7c2011-09-22 21:38:52 +10003358 return -1;
Darren Tuckere7066df2004-05-24 10:18:05 +10003359
3360 for (i = 0; i < num_permitted_opens; i++) {
Damien Miller7acefbb2014-07-18 14:11:24 +10003361 if (open_listen_match_tcpip(&permitted_opens[i], host, port, 0))
Darren Tuckere7066df2004-05-24 10:18:05 +10003362 break;
3363 }
3364 if (i >= num_permitted_opens) {
3365 debug("%s: requested forward not found", __func__);
Damien Millerf6dff7c2011-09-22 21:38:52 +10003366 return -1;
Darren Tuckere7066df2004-05-24 10:18:05 +10003367 }
3368 packet_start(SSH2_MSG_GLOBAL_REQUEST);
3369 packet_put_cstring("cancel-tcpip-forward");
3370 packet_put_char(0);
Damien Millerf6dff7c2011-09-22 21:38:52 +10003371 packet_put_cstring(channel_rfwd_bind_host(host));
Darren Tuckere7066df2004-05-24 10:18:05 +10003372 packet_put_int(port);
3373 packet_send();
3374
Damien Miller4b3ed642014-07-02 15:29:40 +10003375 permitted_opens[i].listen_port = 0;
Damien Miller7acefbb2014-07-18 14:11:24 +10003376 permitted_opens[i].port_to_connect = 0;
Darren Tuckera627d422013-06-02 07:31:17 +10003377 free(permitted_opens[i].host_to_connect);
Darren Tuckere7066df2004-05-24 10:18:05 +10003378 permitted_opens[i].host_to_connect = NULL;
Damien Miller4b3ed642014-07-02 15:29:40 +10003379 free(permitted_opens[i].listen_host);
3380 permitted_opens[i].listen_host = NULL;
Damien Miller7acefbb2014-07-18 14:11:24 +10003381 permitted_opens[i].listen_path = NULL;
Damien Millerf6dff7c2011-09-22 21:38:52 +10003382
3383 return 0;
Darren Tuckere7066df2004-05-24 10:18:05 +10003384}
3385
3386/*
Damien Miller7acefbb2014-07-18 14:11:24 +10003387 * Request cancellation of remote forwarding of Unix domain socket
3388 * path from local side.
3389 */
3390static int
3391channel_request_rforward_cancel_streamlocal(const char *path)
3392{
3393 int i;
3394
3395 if (!compat20)
3396 return -1;
3397
3398 for (i = 0; i < num_permitted_opens; i++) {
3399 if (open_listen_match_streamlocal(&permitted_opens[i], path))
3400 break;
3401 }
3402 if (i >= num_permitted_opens) {
3403 debug("%s: requested forward not found", __func__);
3404 return -1;
3405 }
3406 packet_start(SSH2_MSG_GLOBAL_REQUEST);
3407 packet_put_cstring("cancel-streamlocal-forward@openssh.com");
3408 packet_put_char(0);
3409 packet_put_cstring(path);
3410 packet_send();
3411
3412 permitted_opens[i].listen_port = 0;
3413 permitted_opens[i].port_to_connect = 0;
3414 free(permitted_opens[i].host_to_connect);
3415 permitted_opens[i].host_to_connect = NULL;
3416 permitted_opens[i].listen_host = NULL;
3417 free(permitted_opens[i].listen_path);
3418 permitted_opens[i].listen_path = NULL;
3419
3420 return 0;
3421}
3422
3423/*
3424 * Request cancellation of remote forwarding of a connection from local side.
3425 */
3426int
3427channel_request_rforward_cancel(struct Forward *fwd)
3428{
3429 if (fwd->listen_path != NULL) {
3430 return (channel_request_rforward_cancel_streamlocal(
3431 fwd->listen_path));
3432 } else {
3433 return (channel_request_rforward_cancel_tcpip(fwd->listen_host,
3434 fwd->listen_port ? fwd->listen_port : fwd->allocated_port));
3435 }
3436}
3437
3438/*
Damien Miller5428f641999-11-25 11:54:57 +11003439 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
3440 * listening for the port, and sends back a success reply (or disconnect
Darren Tuckere7d4b192006-07-12 22:17:10 +10003441 * message if there was an error).
Damien Miller5428f641999-11-25 11:54:57 +11003442 */
Darren Tuckere7d4b192006-07-12 22:17:10 +10003443int
Damien Miller7acefbb2014-07-18 14:11:24 +10003444channel_input_port_forward_request(int is_root, struct ForwardOptions *fwd_opts)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003445{
Darren Tuckere7d4b192006-07-12 22:17:10 +10003446 int success = 0;
Damien Miller7acefbb2014-07-18 14:11:24 +10003447 struct Forward fwd;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003448
Damien Miller95def091999-11-25 00:26:21 +11003449 /* Get arguments from the packet. */
Damien Miller7acefbb2014-07-18 14:11:24 +10003450 memset(&fwd, 0, sizeof(fwd));
3451 fwd.listen_port = packet_get_int();
3452 fwd.connect_host = packet_get_string(NULL);
3453 fwd.connect_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003454
Damien Millerbac2d8a2000-09-05 16:13:06 +11003455#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11003456 /*
3457 * Check that an unprivileged user is not trying to forward a
3458 * privileged port.
3459 */
Damien Miller7acefbb2014-07-18 14:11:24 +10003460 if (fwd.listen_port < IPPORT_RESERVED && !is_root)
Darren Tucker9189ff82003-07-03 13:52:04 +10003461 packet_disconnect(
3462 "Requested forwarding of port %d but user is not root.",
Damien Miller7acefbb2014-07-18 14:11:24 +10003463 fwd.listen_port);
3464 if (fwd.connect_port == 0)
Darren Tucker9189ff82003-07-03 13:52:04 +10003465 packet_disconnect("Dynamic forwarding denied.");
Damien Millerbac2d8a2000-09-05 16:13:06 +11003466#endif
Darren Tucker9189ff82003-07-03 13:52:04 +10003467
Damien Miller0bc1bd82000-11-13 22:57:25 +11003468 /* Initiate forwarding */
Damien Miller7acefbb2014-07-18 14:11:24 +10003469 success = channel_setup_local_fwd_listener(&fwd, fwd_opts);
Damien Miller95def091999-11-25 00:26:21 +11003470
3471 /* Free the argument string. */
Damien Miller7acefbb2014-07-18 14:11:24 +10003472 free(fwd.connect_host);
Darren Tuckere7d4b192006-07-12 22:17:10 +10003473
3474 return (success ? 0 : -1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003475}
3476
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003477/*
3478 * Permits opening to any host/port if permitted_opens[] is empty. This is
3479 * usually called by the server, because the user could connect to any port
3480 * anyway, and the server has no way to know but to trust the client anyway.
3481 */
3482void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00003483channel_permit_all_opens(void)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003484{
3485 if (num_permitted_opens == 0)
3486 all_opens_permitted = 1;
3487}
3488
Ben Lindstroma3700052001-04-05 23:26:32 +00003489void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003490channel_add_permitted_opens(char *host, int port)
3491{
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003492 debug("allow port forwarding to host %s port %d", host, port);
3493
deraadt@openbsd.org657a5fb2015-04-24 01:36:00 +00003494 permitted_opens = xreallocarray(permitted_opens,
Damien Miller232cfb12010-06-26 09:50:30 +10003495 num_permitted_opens + 1, sizeof(*permitted_opens));
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003496 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
3497 permitted_opens[num_permitted_opens].port_to_connect = port;
Damien Miller4b3ed642014-07-02 15:29:40 +10003498 permitted_opens[num_permitted_opens].listen_host = NULL;
Damien Miller7acefbb2014-07-18 14:11:24 +10003499 permitted_opens[num_permitted_opens].listen_path = NULL;
Damien Miller4b3ed642014-07-02 15:29:40 +10003500 permitted_opens[num_permitted_opens].listen_port = 0;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003501 num_permitted_opens++;
3502
3503 all_opens_permitted = 0;
3504}
3505
Darren Tucker68afb8c2011-10-02 18:59:03 +11003506/*
3507 * Update the listen port for a dynamic remote forward, after
3508 * the actual 'newport' has been allocated. If 'newport' < 0 is
3509 * passed then they entry will be invalidated.
3510 */
3511void
3512channel_update_permitted_opens(int idx, int newport)
3513{
3514 if (idx < 0 || idx >= num_permitted_opens) {
3515 debug("channel_update_permitted_opens: index out of range:"
3516 " %d num_permitted_opens %d", idx, num_permitted_opens);
3517 return;
3518 }
3519 debug("%s allowed port %d for forwarding to host %s port %d",
3520 newport > 0 ? "Updating" : "Removing",
3521 newport,
3522 permitted_opens[idx].host_to_connect,
3523 permitted_opens[idx].port_to_connect);
3524 if (newport >= 0) {
3525 permitted_opens[idx].listen_port =
3526 (datafellows & SSH_BUG_DYNAMIC_RPORT) ? 0 : newport;
3527 } else {
3528 permitted_opens[idx].listen_port = 0;
3529 permitted_opens[idx].port_to_connect = 0;
Darren Tuckera627d422013-06-02 07:31:17 +10003530 free(permitted_opens[idx].host_to_connect);
Darren Tucker68afb8c2011-10-02 18:59:03 +11003531 permitted_opens[idx].host_to_connect = NULL;
Damien Miller4b3ed642014-07-02 15:29:40 +10003532 free(permitted_opens[idx].listen_host);
3533 permitted_opens[idx].listen_host = NULL;
Damien Miller7acefbb2014-07-18 14:11:24 +10003534 free(permitted_opens[idx].listen_path);
3535 permitted_opens[idx].listen_path = NULL;
Darren Tucker68afb8c2011-10-02 18:59:03 +11003536 }
3537}
3538
Damien Millera765cf42006-07-24 14:08:13 +10003539int
Damien Miller9b439df2006-07-24 14:04:00 +10003540channel_add_adm_permitted_opens(char *host, int port)
3541{
Damien Millera765cf42006-07-24 14:08:13 +10003542 debug("config allows port forwarding to host %s port %d", host, port);
Damien Miller9b439df2006-07-24 14:04:00 +10003543
deraadt@openbsd.org657a5fb2015-04-24 01:36:00 +00003544 permitted_adm_opens = xreallocarray(permitted_adm_opens,
Damien Miller232cfb12010-06-26 09:50:30 +10003545 num_adm_permitted_opens + 1, sizeof(*permitted_adm_opens));
Damien Miller9b439df2006-07-24 14:04:00 +10003546 permitted_adm_opens[num_adm_permitted_opens].host_to_connect
3547 = xstrdup(host);
3548 permitted_adm_opens[num_adm_permitted_opens].port_to_connect = port;
Damien Miller4b3ed642014-07-02 15:29:40 +10003549 permitted_adm_opens[num_adm_permitted_opens].listen_host = NULL;
Damien Miller7acefbb2014-07-18 14:11:24 +10003550 permitted_adm_opens[num_adm_permitted_opens].listen_path = NULL;
Damien Miller4b3ed642014-07-02 15:29:40 +10003551 permitted_adm_opens[num_adm_permitted_opens].listen_port = 0;
Damien Millera765cf42006-07-24 14:08:13 +10003552 return ++num_adm_permitted_opens;
Damien Miller9b439df2006-07-24 14:04:00 +10003553}
3554
3555void
Damien Millerc6081482012-04-22 11:18:53 +10003556channel_disable_adm_local_opens(void)
3557{
Damien Milleraa5b3f82012-12-03 09:50:54 +11003558 channel_clear_adm_permitted_opens();
dtucker@openbsd.org297060f2015-05-08 03:25:07 +00003559 permitted_adm_opens = xcalloc(sizeof(*permitted_adm_opens), 1);
Damien Milleraa5b3f82012-12-03 09:50:54 +11003560 permitted_adm_opens[num_adm_permitted_opens].host_to_connect = NULL;
3561 num_adm_permitted_opens = 1;
Damien Millerc6081482012-04-22 11:18:53 +10003562}
3563
3564void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003565channel_clear_permitted_opens(void)
3566{
3567 int i;
3568
Damien Miller4b3ed642014-07-02 15:29:40 +10003569 for (i = 0; i < num_permitted_opens; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10003570 free(permitted_opens[i].host_to_connect);
Damien Miller4b3ed642014-07-02 15:29:40 +10003571 free(permitted_opens[i].listen_host);
Damien Miller7acefbb2014-07-18 14:11:24 +10003572 free(permitted_opens[i].listen_path);
Damien Miller4b3ed642014-07-02 15:29:40 +10003573 }
Darren Tuckera627d422013-06-02 07:31:17 +10003574 free(permitted_opens);
3575 permitted_opens = NULL;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003576 num_permitted_opens = 0;
Damien Miller9b439df2006-07-24 14:04:00 +10003577}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003578
Damien Miller9b439df2006-07-24 14:04:00 +10003579void
3580channel_clear_adm_permitted_opens(void)
3581{
3582 int i;
3583
Damien Miller4b3ed642014-07-02 15:29:40 +10003584 for (i = 0; i < num_adm_permitted_opens; i++) {
Darren Tuckera627d422013-06-02 07:31:17 +10003585 free(permitted_adm_opens[i].host_to_connect);
Damien Miller4b3ed642014-07-02 15:29:40 +10003586 free(permitted_adm_opens[i].listen_host);
Damien Miller7acefbb2014-07-18 14:11:24 +10003587 free(permitted_adm_opens[i].listen_path);
Damien Miller4b3ed642014-07-02 15:29:40 +10003588 }
Darren Tuckera627d422013-06-02 07:31:17 +10003589 free(permitted_adm_opens);
3590 permitted_adm_opens = NULL;
Damien Miller9b439df2006-07-24 14:04:00 +10003591 num_adm_permitted_opens = 0;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003592}
3593
Darren Tuckere7140f22008-06-10 23:01:51 +10003594void
3595channel_print_adm_permitted_opens(void)
3596{
Damien Miller6ef17492008-07-16 22:42:06 +10003597 int i;
Darren Tuckere7140f22008-06-10 23:01:51 +10003598
Damien Millerb53d8a12009-01-28 16:13:04 +11003599 printf("permitopen");
Darren Tucker22662e82008-11-11 16:40:22 +11003600 if (num_adm_permitted_opens == 0) {
Damien Millerb53d8a12009-01-28 16:13:04 +11003601 printf(" any\n");
Darren Tucker22662e82008-11-11 16:40:22 +11003602 return;
3603 }
Darren Tuckere7140f22008-06-10 23:01:51 +10003604 for (i = 0; i < num_adm_permitted_opens; i++)
Damien Millerc6081482012-04-22 11:18:53 +10003605 if (permitted_adm_opens[i].host_to_connect == NULL)
3606 printf(" none");
3607 else
Darren Tuckere7140f22008-06-10 23:01:51 +10003608 printf(" %s:%d", permitted_adm_opens[i].host_to_connect,
3609 permitted_adm_opens[i].port_to_connect);
Damien Millerb53d8a12009-01-28 16:13:04 +11003610 printf("\n");
Darren Tuckere7140f22008-06-10 23:01:51 +10003611}
3612
Darren Tucker1338b9e2011-10-02 18:57:35 +11003613/* returns port number, FWD_PERMIT_ANY_PORT or -1 on error */
3614int
3615permitopen_port(const char *p)
3616{
3617 int port;
3618
3619 if (strcmp(p, "*") == 0)
3620 return FWD_PERMIT_ANY_PORT;
3621 if ((port = a2port(p)) > 0)
3622 return port;
3623 return -1;
3624}
3625
Damien Millerbd740252008-05-19 15:37:09 +10003626/* Try to start non-blocking connect to next host in cctx list */
Ben Lindstrombba81212001-06-25 05:01:22 +00003627static int
Damien Millerbd740252008-05-19 15:37:09 +10003628connect_next(struct channel_connect *cctx)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003629{
Damien Millerbd740252008-05-19 15:37:09 +10003630 int sock, saved_errno;
Damien Miller7acefbb2014-07-18 14:11:24 +10003631 struct sockaddr_un *sunaddr;
3632 char ntop[NI_MAXHOST], strport[MAX(NI_MAXSERV,sizeof(sunaddr->sun_path))];
Damien Miller95def091999-11-25 00:26:21 +11003633
Damien Millerbd740252008-05-19 15:37:09 +10003634 for (; cctx->ai; cctx->ai = cctx->ai->ai_next) {
Damien Miller7acefbb2014-07-18 14:11:24 +10003635 switch (cctx->ai->ai_family) {
3636 case AF_UNIX:
3637 /* unix:pathname instead of host:port */
3638 sunaddr = (struct sockaddr_un *)cctx->ai->ai_addr;
3639 strlcpy(ntop, "unix", sizeof(ntop));
3640 strlcpy(strport, sunaddr->sun_path, sizeof(strport));
3641 break;
3642 case AF_INET:
3643 case AF_INET6:
3644 if (getnameinfo(cctx->ai->ai_addr, cctx->ai->ai_addrlen,
3645 ntop, sizeof(ntop), strport, sizeof(strport),
3646 NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
3647 error("connect_next: getnameinfo failed");
3648 continue;
3649 }
3650 break;
3651 default:
Damien Miller34132e52000-01-14 15:45:46 +11003652 continue;
3653 }
Darren Tucker7bd98e72010-01-10 10:31:12 +11003654 if ((sock = socket(cctx->ai->ai_family, cctx->ai->ai_socktype,
3655 cctx->ai->ai_protocol)) == -1) {
Damien Millerbd740252008-05-19 15:37:09 +10003656 if (cctx->ai->ai_next == NULL)
Damien Millerb46b9f32003-01-10 21:45:12 +11003657 error("socket: %.100s", strerror(errno));
3658 else
3659 verbose("socket: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003660 continue;
3661 }
Damien Miller232711f2004-06-15 10:35:30 +10003662 if (set_nonblock(sock) == -1)
3663 fatal("%s: set_nonblock(%d)", __func__, sock);
Damien Millerbd740252008-05-19 15:37:09 +10003664 if (connect(sock, cctx->ai->ai_addr,
3665 cctx->ai->ai_addrlen) == -1 && errno != EINPROGRESS) {
3666 debug("connect_next: host %.100s ([%.100s]:%s): "
3667 "%.100s", cctx->host, ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11003668 strerror(errno));
Damien Millerbd740252008-05-19 15:37:09 +10003669 saved_errno = errno;
Damien Miller34132e52000-01-14 15:45:46 +11003670 close(sock);
Damien Millerbd740252008-05-19 15:37:09 +10003671 errno = saved_errno;
Kevin Stevesef4eea92001-02-05 12:42:17 +00003672 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11003673 }
Damien Miller7acefbb2014-07-18 14:11:24 +10003674 if (cctx->ai->ai_family != AF_UNIX)
3675 set_nodelay(sock);
Damien Millerbd740252008-05-19 15:37:09 +10003676 debug("connect_next: host %.100s ([%.100s]:%s) "
3677 "in progress, fd=%d", cctx->host, ntop, strport, sock);
3678 cctx->ai = cctx->ai->ai_next;
Damien Millerbd740252008-05-19 15:37:09 +10003679 return sock;
Damien Miller34132e52000-01-14 15:45:46 +11003680 }
Damien Miller0bc1bd82000-11-13 22:57:25 +11003681 return -1;
3682}
Damien Millerb38eff82000-04-01 11:09:21 +10003683
Damien Millerbd740252008-05-19 15:37:09 +10003684static void
3685channel_connect_ctx_free(struct channel_connect *cctx)
3686{
Darren Tuckera627d422013-06-02 07:31:17 +10003687 free(cctx->host);
Damien Miller7acefbb2014-07-18 14:11:24 +10003688 if (cctx->aitop) {
3689 if (cctx->aitop->ai_family == AF_UNIX)
3690 free(cctx->aitop);
3691 else
3692 freeaddrinfo(cctx->aitop);
3693 }
Damien Miller1d2c4562014-02-04 11:18:20 +11003694 memset(cctx, 0, sizeof(*cctx));
Damien Millerbd740252008-05-19 15:37:09 +10003695}
3696
Damien Miller7acefbb2014-07-18 14:11:24 +10003697/* Return CONNECTING channel to remote host:port or local socket path */
Damien Millerbd740252008-05-19 15:37:09 +10003698static Channel *
Damien Miller7acefbb2014-07-18 14:11:24 +10003699connect_to(const char *name, int port, char *ctype, char *rname)
Damien Millerbd740252008-05-19 15:37:09 +10003700{
3701 struct addrinfo hints;
3702 int gaierr;
3703 int sock = -1;
3704 char strport[NI_MAXSERV];
3705 struct channel_connect cctx;
3706 Channel *c;
3707
Damien Miller2bcb8662008-07-12 17:12:29 +10003708 memset(&cctx, 0, sizeof(cctx));
Damien Miller7acefbb2014-07-18 14:11:24 +10003709
3710 if (port == PORT_STREAMLOCAL) {
3711 struct sockaddr_un *sunaddr;
3712 struct addrinfo *ai;
3713
3714 if (strlen(name) > sizeof(sunaddr->sun_path)) {
3715 error("%.100s: %.100s", name, strerror(ENAMETOOLONG));
3716 return (NULL);
3717 }
3718
3719 /*
3720 * Fake up a struct addrinfo for AF_UNIX connections.
3721 * channel_connect_ctx_free() must check ai_family
3722 * and use free() not freeaddirinfo() for AF_UNIX.
3723 */
3724 ai = xmalloc(sizeof(*ai) + sizeof(*sunaddr));
3725 memset(ai, 0, sizeof(*ai) + sizeof(*sunaddr));
3726 ai->ai_addr = (struct sockaddr *)(ai + 1);
3727 ai->ai_addrlen = sizeof(*sunaddr);
3728 ai->ai_family = AF_UNIX;
3729 ai->ai_socktype = SOCK_STREAM;
3730 ai->ai_protocol = PF_UNSPEC;
3731 sunaddr = (struct sockaddr_un *)ai->ai_addr;
3732 sunaddr->sun_family = AF_UNIX;
3733 strlcpy(sunaddr->sun_path, name, sizeof(sunaddr->sun_path));
3734 cctx.aitop = ai;
3735 } else {
3736 memset(&hints, 0, sizeof(hints));
3737 hints.ai_family = IPv4or6;
3738 hints.ai_socktype = SOCK_STREAM;
3739 snprintf(strport, sizeof strport, "%d", port);
3740 if ((gaierr = getaddrinfo(name, strport, &hints, &cctx.aitop)) != 0) {
3741 error("connect_to %.100s: unknown host (%s)", name,
3742 ssh_gai_strerror(gaierr));
3743 return NULL;
3744 }
Damien Millerbd740252008-05-19 15:37:09 +10003745 }
3746
Damien Miller7acefbb2014-07-18 14:11:24 +10003747 cctx.host = xstrdup(name);
Damien Millerbd740252008-05-19 15:37:09 +10003748 cctx.port = port;
3749 cctx.ai = cctx.aitop;
3750
3751 if ((sock = connect_next(&cctx)) == -1) {
3752 error("connect to %.100s port %d failed: %s",
Damien Miller7acefbb2014-07-18 14:11:24 +10003753 name, port, strerror(errno));
Damien Millerbd740252008-05-19 15:37:09 +10003754 channel_connect_ctx_free(&cctx);
3755 return NULL;
3756 }
3757 c = channel_new(ctype, SSH_CHANNEL_CONNECTING, sock, sock, -1,
3758 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, rname, 1);
3759 c->connect_ctx = cctx;
3760 return c;
3761}
3762
3763Channel *
Damien Miller4b3ed642014-07-02 15:29:40 +10003764channel_connect_by_listen_address(const char *listen_host,
3765 u_short listen_port, char *ctype, char *rname)
Damien Millerbd740252008-05-19 15:37:09 +10003766{
3767 int i;
3768
3769 for (i = 0; i < num_permitted_opens; i++) {
Damien Miller7acefbb2014-07-18 14:11:24 +10003770 if (open_listen_match_tcpip(&permitted_opens[i], listen_host,
Damien Miller4b3ed642014-07-02 15:29:40 +10003771 listen_port, 1)) {
Damien Millerbd740252008-05-19 15:37:09 +10003772 return connect_to(
3773 permitted_opens[i].host_to_connect,
3774 permitted_opens[i].port_to_connect, ctype, rname);
3775 }
3776 }
3777 error("WARNING: Server requests forwarding for unknown listen_port %d",
3778 listen_port);
3779 return NULL;
3780}
3781
Damien Miller7acefbb2014-07-18 14:11:24 +10003782Channel *
3783channel_connect_by_listen_path(const char *path, char *ctype, char *rname)
3784{
3785 int i;
3786
3787 for (i = 0; i < num_permitted_opens; i++) {
3788 if (open_listen_match_streamlocal(&permitted_opens[i], path)) {
3789 return connect_to(
3790 permitted_opens[i].host_to_connect,
3791 permitted_opens[i].port_to_connect, ctype, rname);
3792 }
3793 }
3794 error("WARNING: Server requests forwarding for unknown path %.100s",
3795 path);
3796 return NULL;
3797}
3798
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003799/* Check if connecting to that port is permitted and connect. */
Damien Millerbd740252008-05-19 15:37:09 +10003800Channel *
Damien Miller7acefbb2014-07-18 14:11:24 +10003801channel_connect_to_port(const char *host, u_short port, char *ctype, char *rname)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003802{
Damien Miller9b439df2006-07-24 14:04:00 +10003803 int i, permit, permit_adm = 1;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003804
3805 permit = all_opens_permitted;
3806 if (!permit) {
3807 for (i = 0; i < num_permitted_opens; i++)
Damien Miller4b3ed642014-07-02 15:29:40 +10003808 if (open_match(&permitted_opens[i], host, port)) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003809 permit = 1;
Damien Miller4b3ed642014-07-02 15:29:40 +10003810 break;
3811 }
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003812 }
Damien Miller9b439df2006-07-24 14:04:00 +10003813
3814 if (num_adm_permitted_opens > 0) {
3815 permit_adm = 0;
3816 for (i = 0; i < num_adm_permitted_opens; i++)
Damien Miller4b3ed642014-07-02 15:29:40 +10003817 if (open_match(&permitted_adm_opens[i], host, port)) {
Damien Miller9b439df2006-07-24 14:04:00 +10003818 permit_adm = 1;
Damien Miller4b3ed642014-07-02 15:29:40 +10003819 break;
3820 }
Damien Miller9b439df2006-07-24 14:04:00 +10003821 }
3822
3823 if (!permit || !permit_adm) {
Damien Miller996acd22003-04-09 20:59:48 +10003824 logit("Received request to connect to host %.100s port %d, "
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003825 "but the request was denied.", host, port);
Damien Millerbd740252008-05-19 15:37:09 +10003826 return NULL;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003827 }
Damien Millerbd740252008-05-19 15:37:09 +10003828 return connect_to(host, port, ctype, rname);
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00003829}
3830
Damien Miller7acefbb2014-07-18 14:11:24 +10003831/* Check if connecting to that path is permitted and connect. */
3832Channel *
3833channel_connect_to_path(const char *path, char *ctype, char *rname)
3834{
3835 int i, permit, permit_adm = 1;
3836
3837 permit = all_opens_permitted;
3838 if (!permit) {
3839 for (i = 0; i < num_permitted_opens; i++)
3840 if (open_match(&permitted_opens[i], path, PORT_STREAMLOCAL)) {
3841 permit = 1;
3842 break;
3843 }
3844 }
3845
3846 if (num_adm_permitted_opens > 0) {
3847 permit_adm = 0;
3848 for (i = 0; i < num_adm_permitted_opens; i++)
3849 if (open_match(&permitted_adm_opens[i], path, PORT_STREAMLOCAL)) {
3850 permit_adm = 1;
3851 break;
3852 }
3853 }
3854
3855 if (!permit || !permit_adm) {
3856 logit("Received request to connect to path %.100s, "
3857 "but the request was denied.", path);
3858 return NULL;
3859 }
3860 return connect_to(path, PORT_STREAMLOCAL, ctype, rname);
3861}
3862
Damien Miller0e220db2004-06-15 10:34:08 +10003863void
3864channel_send_window_changes(void)
3865{
Darren Tuckerc7a6fc42004-08-13 21:18:00 +10003866 u_int i;
Damien Miller0e220db2004-06-15 10:34:08 +10003867 struct winsize ws;
3868
3869 for (i = 0; i < channels_alloc; i++) {
Darren Tucker47eede72005-03-14 23:08:12 +11003870 if (channels[i] == NULL || !channels[i]->client_tty ||
Damien Miller0e220db2004-06-15 10:34:08 +10003871 channels[i]->type != SSH_CHANNEL_OPEN)
3872 continue;
3873 if (ioctl(channels[i]->rfd, TIOCGWINSZ, &ws) < 0)
3874 continue;
3875 channel_request_start(i, "window-change", 0);
Damien Miller71a73672006-03-26 14:04:36 +11003876 packet_put_int((u_int)ws.ws_col);
3877 packet_put_int((u_int)ws.ws_row);
3878 packet_put_int((u_int)ws.ws_xpixel);
3879 packet_put_int((u_int)ws.ws_ypixel);
Damien Miller0e220db2004-06-15 10:34:08 +10003880 packet_send();
3881 }
3882}
3883
Ben Lindstrome9c99912001-06-09 00:41:05 +00003884/* -- X11 forwarding */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003885
Damien Miller5428f641999-11-25 11:54:57 +11003886/*
3887 * Creates an internet domain socket for listening for X11 connections.
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003888 * Returns 0 and a suitable display number for the DISPLAY variable
3889 * stored in display_numberp , or -1 if an error occurs.
Damien Miller5428f641999-11-25 11:54:57 +11003890 */
Kevin Steves366298c2001-12-19 17:58:01 +00003891int
Damien Miller95c249f2002-02-05 12:11:34 +11003892x11_create_display_inet(int x11_display_offset, int x11_use_localhost,
Damien Miller2b9b0452005-07-17 17:19:24 +10003893 int single_connection, u_int *display_numberp, int **chanids)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003894{
Damien Millere7378562001-12-21 14:58:35 +11003895 Channel *nc = NULL;
Damien Milleraae6c611999-12-06 11:47:28 +11003896 int display_number, sock;
3897 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11003898 struct addrinfo hints, *ai, *aitop;
3899 char strport[NI_MAXSERV];
3900 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003901
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003902 if (chanids == NULL)
3903 return -1;
3904
Damien Millera34a28b1999-12-14 10:47:15 +11003905 for (display_number = x11_display_offset;
Damien Miller9f0f5c62001-12-21 14:45:46 +11003906 display_number < MAX_DISPLAYS;
3907 display_number++) {
Damien Miller95def091999-11-25 00:26:21 +11003908 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11003909 memset(&hints, 0, sizeof(hints));
3910 hints.ai_family = IPv4or6;
Damien Miller95c249f2002-02-05 12:11:34 +11003911 hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
Damien Miller34132e52000-01-14 15:45:46 +11003912 hints.ai_socktype = SOCK_STREAM;
3913 snprintf(strport, sizeof strport, "%d", port);
3914 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11003915 error("getaddrinfo: %.100s", ssh_gai_strerror(gaierr));
Kevin Steves366298c2001-12-19 17:58:01 +00003916 return -1;
Damien Miller95def091999-11-25 00:26:21 +11003917 }
Damien Miller34132e52000-01-14 15:45:46 +11003918 for (ai = aitop; ai; ai = ai->ai_next) {
3919 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
3920 continue;
Darren Tucker7bd98e72010-01-10 10:31:12 +11003921 sock = socket(ai->ai_family, ai->ai_socktype,
3922 ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11003923 if (sock < 0) {
Damien Miller6480c632010-03-26 11:09:44 +11003924 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)
3925#ifdef EPFNOSUPPORT
3926 && (errno != EPFNOSUPPORT)
3927#endif
3928 ) {
Damien Millere2192732000-01-17 13:22:55 +11003929 error("socket: %.100s", strerror(errno));
Damien Miller3e4dffb2004-06-15 10:27:15 +10003930 freeaddrinfo(aitop);
Kevin Steves366298c2001-12-19 17:58:01 +00003931 return -1;
Damien Millere2192732000-01-17 13:22:55 +11003932 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11003933 debug("x11_create_display_inet: Socket family %d not supported",
3934 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11003935 continue;
3936 }
Damien Miller34132e52000-01-14 15:45:46 +11003937 }
Damien Miller04ee0f82009-11-18 17:48:30 +11003938 if (ai->ai_family == AF_INET6)
3939 sock_set_v6only(sock);
Damien Miller4401e452008-06-12 06:05:12 +10003940 if (x11_use_localhost)
3941 channel_set_reuseaddr(sock);
Damien Miller34132e52000-01-14 15:45:46 +11003942 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10003943 debug2("bind port %d: %.100s", port, strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003944 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11003945
Damien Miller34132e52000-01-14 15:45:46 +11003946 for (n = 0; n < num_socks; n++) {
Damien Miller34132e52000-01-14 15:45:46 +11003947 close(socks[n]);
3948 }
3949 num_socks = 0;
3950 break;
3951 }
3952 socks[num_socks++] = sock;
3953 if (num_socks == NUM_SOCKS)
3954 break;
Damien Miller95def091999-11-25 00:26:21 +11003955 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00003956 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11003957 if (num_socks > 0)
3958 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003959 }
Damien Miller95def091999-11-25 00:26:21 +11003960 if (display_number >= MAX_DISPLAYS) {
3961 error("Failed to allocate internet-domain X11 display socket.");
Kevin Steves366298c2001-12-19 17:58:01 +00003962 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003963 }
Damien Miller95def091999-11-25 00:26:21 +11003964 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11003965 for (n = 0; n < num_socks; n++) {
3966 sock = socks[n];
Darren Tucker3175eb92003-12-09 19:15:11 +11003967 if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +11003968 error("listen: %.100s", strerror(errno));
Damien Miller34132e52000-01-14 15:45:46 +11003969 close(sock);
Kevin Steves366298c2001-12-19 17:58:01 +00003970 return -1;
Damien Miller34132e52000-01-14 15:45:46 +11003971 }
Damien Miller95def091999-11-25 00:26:21 +11003972 }
Damien Miller34132e52000-01-14 15:45:46 +11003973
Damien Miller34132e52000-01-14 15:45:46 +11003974 /* Allocate a channel for each socket. */
Damien Miller07d86be2006-03-26 14:19:21 +11003975 *chanids = xcalloc(num_socks + 1, sizeof(**chanids));
Damien Miller34132e52000-01-14 15:45:46 +11003976 for (n = 0; n < num_socks; n++) {
3977 sock = socks[n];
Damien Millere7378562001-12-21 14:58:35 +11003978 nc = channel_new("x11 listener",
Damien Millerbd483e72000-04-30 10:00:53 +10003979 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
3980 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10003981 0, "X11 inet listener", 1);
Damien Miller699d0032002-02-08 22:07:16 +11003982 nc->single_connection = single_connection;
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003983 (*chanids)[n] = nc->self;
Damien Miller34132e52000-01-14 15:45:46 +11003984 }
Darren Tuckerd3d0fa12005-10-03 18:03:05 +10003985 (*chanids)[n] = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003986
Kevin Steves366298c2001-12-19 17:58:01 +00003987 /* Return the display number for the DISPLAY environment variable. */
Ben Lindstroma9d2c892002-06-23 21:48:28 +00003988 *display_numberp = display_number;
3989 return (0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003990}
3991
Ben Lindstrombba81212001-06-25 05:01:22 +00003992static int
Damien Miller819dbb62009-01-21 16:46:26 +11003993connect_local_xsocket_path(const char *pathname)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003994{
Damien Miller95def091999-11-25 00:26:21 +11003995 int sock;
3996 struct sockaddr_un addr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10003997
Damien Miller3afe3752001-12-21 12:39:51 +11003998 sock = socket(AF_UNIX, SOCK_STREAM, 0);
3999 if (sock < 0)
4000 error("socket: %.100s", strerror(errno));
4001 memset(&addr, 0, sizeof(addr));
4002 addr.sun_family = AF_UNIX;
Damien Miller819dbb62009-01-21 16:46:26 +11004003 strlcpy(addr.sun_path, pathname, sizeof addr.sun_path);
Damien Miller90967402006-03-26 14:07:26 +11004004 if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == 0)
Damien Miller3afe3752001-12-21 12:39:51 +11004005 return sock;
4006 close(sock);
Damien Miller95def091999-11-25 00:26:21 +11004007 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
4008 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004009}
4010
Damien Miller819dbb62009-01-21 16:46:26 +11004011static int
4012connect_local_xsocket(u_int dnr)
4013{
4014 char buf[1024];
4015 snprintf(buf, sizeof buf, _PATH_UNIX_X, dnr);
4016 return connect_local_xsocket_path(buf);
4017}
4018
Damien Millerbd483e72000-04-30 10:00:53 +10004019int
4020x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004021{
Damien Miller57c4e872006-03-31 23:11:07 +11004022 u_int display_number;
Damien Miller95def091999-11-25 00:26:21 +11004023 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10004024 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11004025 struct addrinfo hints, *ai, *aitop;
4026 char strport[NI_MAXSERV];
Damien Miller57c4e872006-03-31 23:11:07 +11004027 int gaierr, sock = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004028
Damien Miller95def091999-11-25 00:26:21 +11004029 /* Try to open a socket for the local X server. */
4030 display = getenv("DISPLAY");
4031 if (!display) {
4032 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10004033 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004034 }
Damien Miller5428f641999-11-25 11:54:57 +11004035 /*
4036 * Now we decode the value of the DISPLAY variable and make a
4037 * connection to the real X server.
4038 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004039
Damien Miller819dbb62009-01-21 16:46:26 +11004040 /* Check if the display is from launchd. */
4041#ifdef __APPLE__
4042 if (strncmp(display, "/tmp/launch", 11) == 0) {
4043 sock = connect_local_xsocket_path(display);
4044 if (sock < 0)
4045 return -1;
4046
4047 /* OK, we now have a connection to the display. */
4048 return sock;
4049 }
4050#endif
Damien Miller5428f641999-11-25 11:54:57 +11004051 /*
4052 * Check if it is a unix domain socket. Unix domain displays are in
4053 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
4054 */
Damien Miller95def091999-11-25 00:26:21 +11004055 if (strncmp(display, "unix:", 5) == 0 ||
4056 display[0] == ':') {
4057 /* Connect to the unix domain socket. */
Damien Miller57c4e872006-03-31 23:11:07 +11004058 if (sscanf(strrchr(display, ':') + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11004059 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11004060 display);
Damien Millerbd483e72000-04-30 10:00:53 +10004061 return -1;
Damien Miller95def091999-11-25 00:26:21 +11004062 }
4063 /* Create a socket. */
4064 sock = connect_local_xsocket(display_number);
4065 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10004066 return -1;
Damien Miller95def091999-11-25 00:26:21 +11004067
4068 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10004069 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004070 }
Damien Miller5428f641999-11-25 11:54:57 +11004071 /*
4072 * Connect to an inet socket. The DISPLAY value is supposedly
4073 * hostname:d[.s], where hostname may also be numeric IP address.
4074 */
Ben Lindstromccd8d072001-12-07 17:26:48 +00004075 strlcpy(buf, display, sizeof(buf));
Damien Miller95def091999-11-25 00:26:21 +11004076 cp = strchr(buf, ':');
4077 if (!cp) {
4078 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10004079 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004080 }
Damien Miller95def091999-11-25 00:26:21 +11004081 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11004082 /* buf now contains the host name. But first we parse the display number. */
Damien Miller57c4e872006-03-31 23:11:07 +11004083 if (sscanf(cp + 1, "%u", &display_number) != 1) {
Damien Miller95def091999-11-25 00:26:21 +11004084 error("Could not parse display number from DISPLAY: %.100s",
Damien Miller9f0f5c62001-12-21 14:45:46 +11004085 display);
Damien Millerbd483e72000-04-30 10:00:53 +10004086 return -1;
Damien Miller95def091999-11-25 00:26:21 +11004087 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004088
Damien Miller34132e52000-01-14 15:45:46 +11004089 /* Look up the host address */
4090 memset(&hints, 0, sizeof(hints));
4091 hints.ai_family = IPv4or6;
4092 hints.ai_socktype = SOCK_STREAM;
Damien Miller57c4e872006-03-31 23:11:07 +11004093 snprintf(strport, sizeof strport, "%u", 6000 + display_number);
Damien Miller34132e52000-01-14 15:45:46 +11004094 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
Darren Tucker4abde772007-12-29 02:43:51 +11004095 error("%.100s: unknown host. (%s)", buf,
4096 ssh_gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10004097 return -1;
Damien Miller95def091999-11-25 00:26:21 +11004098 }
Damien Miller34132e52000-01-14 15:45:46 +11004099 for (ai = aitop; ai; ai = ai->ai_next) {
4100 /* Create a socket. */
Darren Tucker7bd98e72010-01-10 10:31:12 +11004101 sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
Damien Miller34132e52000-01-14 15:45:46 +11004102 if (sock < 0) {
Damien Millerfbdeece2003-09-02 22:52:31 +10004103 debug2("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10004104 continue;
4105 }
4106 /* Connect it to the display. */
4107 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
Damien Miller57c4e872006-03-31 23:11:07 +11004108 debug2("connect %.100s port %u: %.100s", buf,
Damien Millerb38eff82000-04-01 11:09:21 +10004109 6000 + display_number, strerror(errno));
4110 close(sock);
4111 continue;
4112 }
4113 /* Success */
4114 break;
Damien Miller34132e52000-01-14 15:45:46 +11004115 }
Damien Miller34132e52000-01-14 15:45:46 +11004116 freeaddrinfo(aitop);
4117 if (!ai) {
Damien Miller57c4e872006-03-31 23:11:07 +11004118 error("connect %.100s port %u: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11004119 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10004120 return -1;
Damien Miller95def091999-11-25 00:26:21 +11004121 }
Damien Miller398e1cf2002-02-05 11:52:13 +11004122 set_nodelay(sock);
Damien Millerbd483e72000-04-30 10:00:53 +10004123 return sock;
4124}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004125
Damien Millerbd483e72000-04-30 10:00:53 +10004126/*
4127 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
4128 * the remote channel number. We should do whatever we want, and respond
4129 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
4130 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004131
Damien Miller8473dd82006-07-24 14:08:32 +10004132/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00004133int
Damien Miller630d6f42002-01-22 23:17:30 +11004134x11_input_open(int type, u_int32_t seq, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10004135{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00004136 Channel *c = NULL;
4137 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10004138 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10004139
4140 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00004141
4142 remote_id = packet_get_int();
Ben Lindstrome9c99912001-06-09 00:41:05 +00004143
4144 if (packet_get_protocol_flags() & SSH_PROTOFLAG_HOST_IN_FWD_OPEN) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00004145 remote_host = packet_get_string(NULL);
4146 } else {
4147 remote_host = xstrdup("unknown (remote did not supply name)");
4148 }
Damien Miller48b03fc2002-01-22 23:11:40 +11004149 packet_check_eom();
Damien Millerbd483e72000-04-30 10:00:53 +10004150
4151 /* Obtain a connection to the real X display. */
4152 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00004153 if (sock != -1) {
4154 /* Allocate a channel for this connection. */
4155 c = channel_new("connected x11 socket",
4156 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
4157 remote_host, 1);
Damien Miller699d0032002-02-08 22:07:16 +11004158 c->remote_id = remote_id;
4159 c->force_drain = 1;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00004160 }
Darren Tuckera627d422013-06-02 07:31:17 +10004161 free(remote_host);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00004162 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10004163 /* Send refusal to the remote host. */
4164 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00004165 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10004166 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10004167 /* Send a confirmation to the remote host. */
4168 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00004169 packet_put_int(remote_id);
4170 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10004171 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00004172 packet_send();
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00004173 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004174}
4175
Damien Miller69b69aa2000-10-28 14:19:58 +11004176/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
Damien Miller8473dd82006-07-24 14:08:32 +10004177/* ARGSUSED */
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00004178int
Damien Miller630d6f42002-01-22 23:17:30 +11004179deny_input_open(int type, u_int32_t seq, void *ctxt)
Damien Miller69b69aa2000-10-28 14:19:58 +11004180{
4181 int rchan = packet_get_int();
Ben Lindstrom8b2eecd2002-07-07 22:11:51 +00004182
Ben Lindstrom1c37c6a2001-12-06 18:00:18 +00004183 switch (type) {
Damien Miller69b69aa2000-10-28 14:19:58 +11004184 case SSH_SMSG_AGENT_OPEN:
4185 error("Warning: ssh server tried agent forwarding.");
4186 break;
4187 case SSH_SMSG_X11_OPEN:
4188 error("Warning: ssh server tried X11 forwarding.");
4189 break;
4190 default:
Damien Miller630d6f42002-01-22 23:17:30 +11004191 error("deny_input_open: type %d", type);
Damien Miller69b69aa2000-10-28 14:19:58 +11004192 break;
4193 }
Damien Miller5eb137c2005-12-31 16:19:53 +11004194 error("Warning: this is probably a break-in attempt by a malicious server.");
Damien Miller69b69aa2000-10-28 14:19:58 +11004195 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
4196 packet_put_int(rchan);
4197 packet_send();
markus@openbsd.org3fdc88a2015-01-19 20:07:45 +00004198 return 0;
Damien Miller69b69aa2000-10-28 14:19:58 +11004199}
4200
Damien Miller5428f641999-11-25 11:54:57 +11004201/*
4202 * Requests forwarding of X11 connections, generates fake authentication
4203 * data, and enables authentication spoofing.
Ben Lindstrome9c99912001-06-09 00:41:05 +00004204 * This should be called in the client only.
Damien Miller5428f641999-11-25 11:54:57 +11004205 */
Damien Miller4af51302000-04-16 11:18:38 +10004206void
Damien Miller17e7ed02005-06-17 12:54:33 +10004207x11_request_forwarding_with_spoofing(int client_session_id, const char *disp,
Damien Miller6d7b4372011-06-23 08:31:57 +10004208 const char *proto, const char *data, int want_reply)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004209{
Ben Lindstrom46c16222000-12-22 01:43:59 +00004210 u_int data_len = (u_int) strlen(data) / 2;
Damien Miller13390022005-07-06 09:44:19 +10004211 u_int i, value;
Damien Miller95def091999-11-25 00:26:21 +11004212 char *new_data;
4213 int screen_number;
4214 const char *cp;
Darren Tucker3f9fdc72004-06-22 12:56:01 +10004215 u_int32_t rnd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004216
Damien Millerf92c0792005-07-06 09:45:26 +10004217 if (x11_saved_display == NULL)
4218 x11_saved_display = xstrdup(disp);
4219 else if (strcmp(disp, x11_saved_display) != 0) {
Damien Miller13390022005-07-06 09:44:19 +10004220 error("x11_request_forwarding_with_spoofing: different "
4221 "$DISPLAY already forwarded");
4222 return;
4223 }
4224
Damien Millerd5fe0ba2006-08-30 11:07:39 +10004225 cp = strchr(disp, ':');
Damien Miller95def091999-11-25 00:26:21 +11004226 if (cp)
4227 cp = strchr(cp, '.');
4228 if (cp)
Damien Miller08d61502006-03-26 14:28:32 +11004229 screen_number = (u_int)strtonum(cp + 1, 0, 400, NULL);
Damien Miller95def091999-11-25 00:26:21 +11004230 else
4231 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004232
Damien Miller13390022005-07-06 09:44:19 +10004233 if (x11_saved_proto == NULL) {
4234 /* Save protocol name. */
4235 x11_saved_proto = xstrdup(proto);
4236 /*
Damien Miller46d38de2005-07-17 17:02:09 +10004237 * Extract real authentication data and generate fake data
Damien Miller13390022005-07-06 09:44:19 +10004238 * of the same length.
4239 */
4240 x11_saved_data = xmalloc(data_len);
4241 x11_fake_data = xmalloc(data_len);
4242 for (i = 0; i < data_len; i++) {
4243 if (sscanf(data + 2 * i, "%2x", &value) != 1)
4244 fatal("x11_request_forwarding: bad "
4245 "authentication data: %.100s", data);
4246 if (i % 4 == 0)
4247 rnd = arc4random();
4248 x11_saved_data[i] = value;
4249 x11_fake_data[i] = rnd & 0xff;
4250 rnd >>= 8;
4251 }
4252 x11_saved_data_len = data_len;
4253 x11_fake_data_len = data_len;
Damien Miller95def091999-11-25 00:26:21 +11004254 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004255
Damien Miller95def091999-11-25 00:26:21 +11004256 /* Convert the fake data into hex. */
Damien Miller13390022005-07-06 09:44:19 +10004257 new_data = tohex(x11_fake_data, data_len);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004258
Damien Miller95def091999-11-25 00:26:21 +11004259 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10004260 if (compat20) {
Damien Miller6d7b4372011-06-23 08:31:57 +10004261 channel_request_start(client_session_id, "x11-req", want_reply);
Damien Millerbd483e72000-04-30 10:00:53 +10004262 packet_put_char(0); /* XXX bool single connection */
4263 } else {
4264 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
4265 }
4266 packet_put_cstring(proto);
4267 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11004268 packet_put_int(screen_number);
4269 packet_send();
4270 packet_write_wait();
Darren Tuckera627d422013-06-02 07:31:17 +10004271 free(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004272}
4273
Ben Lindstrome9c99912001-06-09 00:41:05 +00004274
4275/* -- agent forwarding */
4276
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004277/* Sends a message to the server to request authentication fd forwarding. */
4278
Damien Miller4af51302000-04-16 11:18:38 +10004279void
Ben Lindstrom3c36bb22001-12-06 17:55:26 +00004280auth_request_forwarding(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004281{
Damien Miller95def091999-11-25 00:26:21 +11004282 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
4283 packet_send();
4284 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10004285}