blob: 55cef42c23482367d2502208b0d891f8601f2b89 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * This file contains functions for generic socket connection forwarding.
6 * There is also code for initiating connection forwarding for X11 connections,
7 * arbitrary tcp/ip connections, and the authentication agent connection.
Damien Miller4af51302000-04-16 11:18:38 +10008 *
Damien Millere4340be2000-09-16 13:29:08 +11009 * As far as I am concerned, the code I have written for this software
10 * can be used freely for any purpose. Any derived versions of this
11 * software must be clearly marked as such, and if the derived work is
12 * incompatible with the protocol description in the RFC file, it must be
13 * called by a name other than "ssh" or "Secure Shell".
14 *
15 *
Damien Miller33b13562000-04-04 14:38:59 +100016 * SSH2 support added by Markus Friedl.
Damien Millere4340be2000-09-16 13:29:08 +110017 * Copyright (c) 1999,2000 Markus Friedl. All rights reserved.
18 * 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"
Ben Lindstromb6147ab2001-05-17 03:21:27 +000043RCSID("$OpenBSD: channels.c,v 1.116 2001/05/16 22:09:20 markus Exp $");
Ben Lindstrom226cfa02001-01-22 05:34:40 +000044
45#include <openssl/rsa.h>
46#include <openssl/dsa.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100047
48#include "ssh.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000049#include "ssh1.h"
50#include "ssh2.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100051#include "packet.h"
52#include "xmalloc.h"
53#include "buffer.h"
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +000054#include "bufaux.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100055#include "uidswap.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000056#include "log.h"
57#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100058#include "channels.h"
59#include "nchan.h"
60#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000061#include "canohost.h"
Damien Miller994cf142000-07-21 10:19:44 +100062#include "key.h"
63#include "authfd.h"
64
Damien Millerd4a8b7e1999-10-27 13:42:43 +100065/* Maximum number of fake X11 displays to try. */
66#define MAX_DISPLAYS 1000
67
68/* Max len of agent socket */
69#define MAX_SOCKET_NAME 100
70
Damien Miller5428f641999-11-25 11:54:57 +110071/*
72 * Pointer to an array containing all allocated channels. The array is
73 * dynamically extended as needed.
74 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +000075static Channel **channels = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100076
Damien Miller5428f641999-11-25 11:54:57 +110077/*
78 * Size of the channel array. All slots of the array must always be
Ben Lindstrom99c73b32001-05-05 04:09:47 +000079 * initialized (at least the type field); unused slots set to NULL
Damien Miller5428f641999-11-25 11:54:57 +110080 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100081static int channels_alloc = 0;
82
Damien Miller5428f641999-11-25 11:54:57 +110083/*
84 * Maximum file descriptor value used in any of the channels. This is
Ben Lindstrom99c73b32001-05-05 04:09:47 +000085 * updated in channel_new.
Damien Miller5428f641999-11-25 11:54:57 +110086 */
Damien Miller5e953212001-01-30 09:14:00 +110087static int channel_max_fd = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100088
89/* Name and directory of socket for authentication agent forwarding. */
90static char *channel_forwarded_auth_socket_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +110091static char *channel_forwarded_auth_socket_dir = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100092
93/* Saved X11 authentication protocol name. */
94char *x11_saved_proto = NULL;
95
96/* Saved X11 authentication data. This is the real data. */
97char *x11_saved_data = NULL;
Ben Lindstrom46c16222000-12-22 01:43:59 +000098u_int x11_saved_data_len = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +100099
Damien Miller5428f641999-11-25 11:54:57 +1100100/*
101 * Fake X11 authentication data. This is what the server will be sending us;
102 * we should replace any occurrences of this by the real data.
103 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000104char *x11_fake_data = NULL;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000105u_int x11_fake_data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000106
Damien Miller5428f641999-11-25 11:54:57 +1100107/*
108 * Data structure for storing which hosts are permitted for forward requests.
109 * The local sides of any remote forwards are stored in this array to prevent
110 * a corrupt remote server from accessing arbitrary TCP/IP ports on our local
111 * network (which might be behind a firewall).
112 */
Damien Miller95def091999-11-25 00:26:21 +1100113typedef struct {
Damien Millerb38eff82000-04-01 11:09:21 +1000114 char *host_to_connect; /* Connect to 'host'. */
115 u_short port_to_connect; /* Connect to 'port'. */
116 u_short listen_port; /* Remote side should listen port number. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000117} ForwardPermission;
118
119/* List of all permitted host/port pairs to connect. */
120static ForwardPermission permitted_opens[SSH_MAX_FORWARDS_PER_DIRECTION];
121/* Number of permitted host/port pairs in the array. */
122static int num_permitted_opens = 0;
Damien Miller5428f641999-11-25 11:54:57 +1100123/*
124 * If this is true, all opens are permitted. This is the case on the server
125 * on which we have to trust the client anyway, and the user could do
126 * anything after logging in anyway.
127 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000128static int all_opens_permitted = 0;
129
130/* This is set to true if both sides support SSH_PROTOFLAG_HOST_IN_FWD_OPEN. */
131static int have_hostname_in_open = 0;
132
Ben Lindstrom226cfa02001-01-22 05:34:40 +0000133/* AF_UNSPEC or AF_INET or AF_INET6 */
134extern int IPv4or6;
135
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000136void port_open_helper(Channel *c, char *rtype);
137
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000138/* Sets specific protocol options. */
139
Damien Miller4af51302000-04-16 11:18:38 +1000140void
Damien Miller95def091999-11-25 00:26:21 +1100141channel_set_options(int hostname_in_open)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000142{
Damien Miller95def091999-11-25 00:26:21 +1100143 have_hostname_in_open = hostname_in_open;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000144}
145
Damien Millerb38eff82000-04-01 11:09:21 +1000146/* lookup channel by id */
147
148Channel *
149channel_lookup(int id)
150{
151 Channel *c;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000152
Damien Millerc0fd17f2000-06-26 10:22:53 +1000153 if (id < 0 || id > channels_alloc) {
Damien Millerb38eff82000-04-01 11:09:21 +1000154 log("channel_lookup: %d: bad id", id);
155 return NULL;
156 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000157 c = channels[id];
158 if (c == NULL) {
Damien Millerb38eff82000-04-01 11:09:21 +1000159 log("channel_lookup: %d: bad id: channel free", id);
160 return NULL;
161 }
162 return c;
163}
164
Damien Miller5428f641999-11-25 11:54:57 +1100165/*
Damien Millere247cc42000-05-07 12:03:14 +1000166 * Register filedescriptors for a channel, used when allocating a channel or
Damien Miller6f83b8e2000-05-02 09:23:45 +1000167 * when the channel consumer/producer is ready, e.g. shell exec'd
Damien Miller5428f641999-11-25 11:54:57 +1100168 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000169
Damien Miller6f83b8e2000-05-02 09:23:45 +1000170void
Damien Miller69b69aa2000-10-28 14:19:58 +1100171channel_register_fds(Channel *c, int rfd, int wfd, int efd,
172 int extusage, int nonblock)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000173{
Damien Miller95def091999-11-25 00:26:21 +1100174 /* Update the maximum file descriptor value. */
Damien Miller5e953212001-01-30 09:14:00 +1100175 channel_max_fd = MAX(channel_max_fd, rfd);
176 channel_max_fd = MAX(channel_max_fd, wfd);
177 channel_max_fd = MAX(channel_max_fd, efd);
178
Damien Miller5428f641999-11-25 11:54:57 +1100179 /* XXX set close-on-exec -markus */
Damien Millere247cc42000-05-07 12:03:14 +1000180
Damien Miller6f83b8e2000-05-02 09:23:45 +1000181 c->rfd = rfd;
182 c->wfd = wfd;
183 c->sock = (rfd == wfd) ? rfd : -1;
184 c->efd = efd;
185 c->extended_usage = extusage;
Damien Miller69b69aa2000-10-28 14:19:58 +1100186
Damien Miller79438cc2001-02-16 12:34:57 +1100187 /* XXX ugly hack: nonblock is only set by the server */
188 if (nonblock && isatty(c->rfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000189 debug("channel %d: rfd %d isatty", c->self, c->rfd);
Damien Miller79438cc2001-02-16 12:34:57 +1100190 c->isatty = 1;
191 if (!isatty(c->wfd)) {
Ben Lindstromcc74df72001-03-05 06:20:14 +0000192 error("channel %d: wfd %d is not a tty?",
Damien Miller79438cc2001-02-16 12:34:57 +1100193 c->self, c->wfd);
194 }
195 } else {
196 c->isatty = 0;
197 }
198
Damien Miller69b69aa2000-10-28 14:19:58 +1100199 /* enable nonblocking mode */
200 if (nonblock) {
201 if (rfd != -1)
202 set_nonblock(rfd);
203 if (wfd != -1)
204 set_nonblock(wfd);
205 if (efd != -1)
206 set_nonblock(efd);
207 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000208}
209
210/*
211 * Allocate a new channel object and set its type and socket. This will cause
212 * remote_name to be freed.
213 */
214
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000215Channel *
Damien Miller6f83b8e2000-05-02 09:23:45 +1000216channel_new(char *ctype, int type, int rfd, int wfd, int efd,
Damien Miller69b69aa2000-10-28 14:19:58 +1100217 int window, int maxpack, int extusage, char *remote_name, int nonblock)
Damien Miller6f83b8e2000-05-02 09:23:45 +1000218{
219 int i, found;
220 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000221
Damien Miller95def091999-11-25 00:26:21 +1100222 /* Do initial allocation if this is the first call. */
223 if (channels_alloc == 0) {
Damien Miller33b13562000-04-04 14:38:59 +1000224 chan_init();
Damien Miller95def091999-11-25 00:26:21 +1100225 channels_alloc = 10;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000226 channels = xmalloc(channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100227 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000228 channels[i] = NULL;
Damien Miller5428f641999-11-25 11:54:57 +1100229 /*
230 * Kludge: arrange a call to channel_stop_listening if we
231 * terminate with fatal().
232 */
Damien Miller95def091999-11-25 00:26:21 +1100233 fatal_add_cleanup((void (*) (void *)) channel_stop_listening, NULL);
234 }
235 /* Try to find a free slot where to put the new channel. */
236 for (found = -1, i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000237 if (channels[i] == NULL) {
Damien Miller95def091999-11-25 00:26:21 +1100238 /* Found a free slot. */
239 found = i;
240 break;
241 }
242 if (found == -1) {
Damien Miller5428f641999-11-25 11:54:57 +1100243 /* There are no free slots. Take last+1 slot and expand the array. */
Damien Miller95def091999-11-25 00:26:21 +1100244 found = channels_alloc;
245 channels_alloc += 10;
Damien Millerd3444942000-09-30 14:20:03 +1100246 debug2("channel: expanding %d", channels_alloc);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000247 channels = xrealloc(channels, channels_alloc * sizeof(Channel *));
Damien Miller95def091999-11-25 00:26:21 +1100248 for (i = found; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000249 channels[i] = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100250 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000251 /* Initialize and return new channel. */
252 c = channels[found] = xmalloc(sizeof(Channel));
Damien Miller95def091999-11-25 00:26:21 +1100253 buffer_init(&c->input);
254 buffer_init(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000255 buffer_init(&c->extended);
Damien Miller95def091999-11-25 00:26:21 +1100256 chan_init_iostates(c);
Damien Miller69b69aa2000-10-28 14:19:58 +1100257 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller95def091999-11-25 00:26:21 +1100258 c->self = found;
259 c->type = type;
Damien Millerb38eff82000-04-01 11:09:21 +1000260 c->ctype = ctype;
Damien Millerbd483e72000-04-30 10:00:53 +1000261 c->local_window = window;
262 c->local_window_max = window;
263 c->local_consumed = 0;
264 c->local_maxpacket = maxpack;
Damien Miller95def091999-11-25 00:26:21 +1100265 c->remote_id = -1;
266 c->remote_name = remote_name;
Damien Millerb38eff82000-04-01 11:09:21 +1000267 c->remote_window = 0;
268 c->remote_maxpacket = 0;
269 c->cb_fn = NULL;
270 c->cb_arg = NULL;
271 c->cb_event = 0;
272 c->dettach_user = NULL;
Damien Millerad833b32000-08-23 10:46:23 +1000273 c->input_filter = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100274 debug("channel %d: new [%s]", found, remote_name);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000275 return c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000276}
Damien Miller6f83b8e2000-05-02 09:23:45 +1000277
278/* Close all channel fd/socket. */
279
280void
281channel_close_fds(Channel *c)
282{
283 if (c->sock != -1) {
284 close(c->sock);
285 c->sock = -1;
286 }
287 if (c->rfd != -1) {
288 close(c->rfd);
289 c->rfd = -1;
290 }
291 if (c->wfd != -1) {
292 close(c->wfd);
293 c->wfd = -1;
294 }
295 if (c->efd != -1) {
296 close(c->efd);
297 c->efd = -1;
298 }
299}
300
301/* Free the channel and close its fd/socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000302
Damien Miller4af51302000-04-16 11:18:38 +1000303void
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000304channel_free(Channel *c)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000305{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000306 char *s;
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000307
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000308 s = channel_open_message();
309 debug("channel_free: channel %d: status: %s", c->self, s);
Ben Lindstrom6c3ae2b2000-12-30 03:25:14 +0000310 xfree(s);
311
Damien Miller33b13562000-04-04 14:38:59 +1000312 if (c->dettach_user != NULL) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000313 debug("channel_free: channel %d: dettaching channel user", c->self);
Damien Miller33b13562000-04-04 14:38:59 +1000314 c->dettach_user(c->self, NULL);
315 }
Damien Miller6f83b8e2000-05-02 09:23:45 +1000316 if (c->sock != -1)
Damien Millerb38eff82000-04-01 11:09:21 +1000317 shutdown(c->sock, SHUT_RDWR);
Damien Miller6f83b8e2000-05-02 09:23:45 +1000318 channel_close_fds(c);
Damien Millerb38eff82000-04-01 11:09:21 +1000319 buffer_free(&c->input);
320 buffer_free(&c->output);
321 buffer_free(&c->extended);
Damien Millerb38eff82000-04-01 11:09:21 +1000322 if (c->remote_name) {
323 xfree(c->remote_name);
324 c->remote_name = NULL;
Damien Miller95def091999-11-25 00:26:21 +1100325 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000326 channels[c->self] = NULL;
327 xfree(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000328}
329
Damien Miller5428f641999-11-25 11:54:57 +1100330/*
Damien Millerb38eff82000-04-01 11:09:21 +1000331 * 'channel_pre*' are called just before select() to add any bits relevant to
332 * channels in the select bitmasks.
Damien Miller5428f641999-11-25 11:54:57 +1100333 */
Damien Millerb38eff82000-04-01 11:09:21 +1000334/*
335 * 'channel_post*': perform any appropriate operations for channels which
336 * have events pending.
337 */
338typedef void chan_fn(Channel *c, fd_set * readset, fd_set * writeset);
339chan_fn *channel_pre[SSH_CHANNEL_MAX_TYPE];
340chan_fn *channel_post[SSH_CHANNEL_MAX_TYPE];
341
342void
343channel_pre_listener(Channel *c, fd_set * readset, fd_set * writeset)
344{
345 FD_SET(c->sock, readset);
346}
347
348void
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000349channel_pre_connecting(Channel *c, fd_set * readset, fd_set * writeset)
350{
351 debug3("channel %d: waiting for connection", c->self);
352 FD_SET(c->sock, writeset);
353}
354
355void
Damien Millerb38eff82000-04-01 11:09:21 +1000356channel_pre_open_13(Channel *c, fd_set * readset, fd_set * writeset)
357{
358 if (buffer_len(&c->input) < packet_get_maxsize())
359 FD_SET(c->sock, readset);
360 if (buffer_len(&c->output) > 0)
361 FD_SET(c->sock, writeset);
362}
363
364void
365channel_pre_open_15(Channel *c, fd_set * readset, fd_set * writeset)
366{
367 /* test whether sockets are 'alive' for read/write */
368 if (c->istate == CHAN_INPUT_OPEN)
369 if (buffer_len(&c->input) < packet_get_maxsize())
370 FD_SET(c->sock, readset);
371 if (c->ostate == CHAN_OUTPUT_OPEN ||
372 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
373 if (buffer_len(&c->output) > 0) {
374 FD_SET(c->sock, writeset);
375 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
376 chan_obuf_empty(c);
377 }
378 }
379}
380
381void
Damien Miller33b13562000-04-04 14:38:59 +1000382channel_pre_open_20(Channel *c, fd_set * readset, fd_set * writeset)
383{
384 if (c->istate == CHAN_INPUT_OPEN &&
385 c->remote_window > 0 &&
386 buffer_len(&c->input) < c->remote_window)
387 FD_SET(c->rfd, readset);
388 if (c->ostate == CHAN_OUTPUT_OPEN ||
389 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
390 if (buffer_len(&c->output) > 0) {
391 FD_SET(c->wfd, writeset);
392 } else if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN) {
393 chan_obuf_empty(c);
394 }
395 }
396 /** XXX check close conditions, too */
397 if (c->efd != -1) {
398 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
399 buffer_len(&c->extended) > 0)
400 FD_SET(c->efd, writeset);
401 else if (c->extended_usage == CHAN_EXTENDED_READ &&
402 buffer_len(&c->extended) < c->remote_window)
403 FD_SET(c->efd, readset);
404 }
405}
406
407void
Damien Millerb38eff82000-04-01 11:09:21 +1000408channel_pre_input_draining(Channel *c, fd_set * readset, fd_set * writeset)
409{
410 if (buffer_len(&c->input) == 0) {
411 packet_start(SSH_MSG_CHANNEL_CLOSE);
412 packet_put_int(c->remote_id);
413 packet_send();
414 c->type = SSH_CHANNEL_CLOSED;
Ben Lindstromc486d882001-04-11 16:08:34 +0000415 debug("channel %d: closing after input drain.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000416 }
417}
418
419void
420channel_pre_output_draining(Channel *c, fd_set * readset, fd_set * writeset)
421{
422 if (buffer_len(&c->output) == 0)
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000423 chan_mark_dead(c);
Damien Miller4af51302000-04-16 11:18:38 +1000424 else
Damien Millerb38eff82000-04-01 11:09:21 +1000425 FD_SET(c->sock, writeset);
426}
427
428/*
429 * This is a special state for X11 authentication spoofing. An opened X11
430 * connection (when authentication spoofing is being done) remains in this
431 * state until the first packet has been completely read. The authentication
432 * data in that packet is then substituted by the real data if it matches the
433 * fake data, and the channel is put into normal mode.
Damien Millerbd483e72000-04-30 10:00:53 +1000434 * XXX All this happens at the client side.
Damien Millerb38eff82000-04-01 11:09:21 +1000435 */
436int
437x11_open_helper(Channel *c)
438{
Ben Lindstrom46c16222000-12-22 01:43:59 +0000439 u_char *ucp;
440 u_int proto_len, data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000441
442 /* Check if the fixed size part of the packet is in buffer. */
443 if (buffer_len(&c->output) < 12)
444 return 0;
445
446 /* Parse the lengths of variable-length fields. */
Ben Lindstrom46c16222000-12-22 01:43:59 +0000447 ucp = (u_char *) buffer_ptr(&c->output);
Damien Millerb38eff82000-04-01 11:09:21 +1000448 if (ucp[0] == 0x42) { /* Byte order MSB first. */
449 proto_len = 256 * ucp[6] + ucp[7];
450 data_len = 256 * ucp[8] + ucp[9];
451 } else if (ucp[0] == 0x6c) { /* Byte order LSB first. */
452 proto_len = ucp[6] + 256 * ucp[7];
453 data_len = ucp[8] + 256 * ucp[9];
454 } else {
455 debug("Initial X11 packet contains bad byte order byte: 0x%x",
456 ucp[0]);
457 return -1;
458 }
459
460 /* Check if the whole packet is in buffer. */
461 if (buffer_len(&c->output) <
462 12 + ((proto_len + 3) & ~3) + ((data_len + 3) & ~3))
463 return 0;
464
465 /* Check if authentication protocol matches. */
466 if (proto_len != strlen(x11_saved_proto) ||
467 memcmp(ucp + 12, x11_saved_proto, proto_len) != 0) {
468 debug("X11 connection uses different authentication protocol.");
469 return -1;
470 }
471 /* Check if authentication data matches our fake data. */
472 if (data_len != x11_fake_data_len ||
473 memcmp(ucp + 12 + ((proto_len + 3) & ~3),
474 x11_fake_data, x11_fake_data_len) != 0) {
475 debug("X11 auth data does not match fake data.");
476 return -1;
477 }
478 /* Check fake data length */
479 if (x11_fake_data_len != x11_saved_data_len) {
480 error("X11 fake_data_len %d != saved_data_len %d",
481 x11_fake_data_len, x11_saved_data_len);
482 return -1;
483 }
484 /*
485 * Received authentication protocol and data match
486 * our fake data. Substitute the fake data with real
487 * data.
488 */
489 memcpy(ucp + 12 + ((proto_len + 3) & ~3),
490 x11_saved_data, x11_saved_data_len);
491 return 1;
492}
493
494void
495channel_pre_x11_open_13(Channel *c, fd_set * readset, fd_set * writeset)
496{
497 int ret = x11_open_helper(c);
498 if (ret == 1) {
499 /* Start normal processing for the channel. */
500 c->type = SSH_CHANNEL_OPEN;
Damien Miller78928792000-04-12 20:17:38 +1000501 channel_pre_open_13(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000502 } else if (ret == -1) {
503 /*
504 * We have received an X11 connection that has bad
505 * authentication information.
506 */
Ben Lindstrom6df8ef42001-03-05 07:47:23 +0000507 log("X11 connection rejected because of wrong authentication.");
Damien Millerb38eff82000-04-01 11:09:21 +1000508 buffer_clear(&c->input);
509 buffer_clear(&c->output);
510 close(c->sock);
511 c->sock = -1;
512 c->type = SSH_CHANNEL_CLOSED;
513 packet_start(SSH_MSG_CHANNEL_CLOSE);
514 packet_put_int(c->remote_id);
515 packet_send();
516 }
517}
518
519void
Damien Millerbd483e72000-04-30 10:00:53 +1000520channel_pre_x11_open(Channel *c, fd_set * readset, fd_set * writeset)
Damien Millerb38eff82000-04-01 11:09:21 +1000521{
522 int ret = x11_open_helper(c);
523 if (ret == 1) {
524 c->type = SSH_CHANNEL_OPEN;
Damien Miller30c3d422000-05-09 11:02:59 +1000525 if (compat20)
526 channel_pre_open_20(c, readset, writeset);
527 else
528 channel_pre_open_15(c, readset, writeset);
Damien Millerb38eff82000-04-01 11:09:21 +1000529 } else if (ret == -1) {
530 debug("X11 rejected %d i%d/o%d", c->self, c->istate, c->ostate);
Damien Millerbd483e72000-04-30 10:00:53 +1000531 chan_read_failed(c); /** force close? */
Damien Millerb38eff82000-04-01 11:09:21 +1000532 chan_write_failed(c);
533 debug("X11 closed %d i%d/o%d", c->self, c->istate, c->ostate);
534 }
535}
536
Ben Lindstromb3921512001-04-11 15:57:50 +0000537/* try to decode a socks4 header */
538int
539channel_decode_socks4(Channel *c, fd_set * readset, fd_set * writeset)
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000540{
541 u_char *p, *host;
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000542 int len, have, i, found;
Ben Lindstromb3921512001-04-11 15:57:50 +0000543 char username[256];
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000544 struct {
545 u_int8_t version;
546 u_int8_t command;
547 u_int16_t dest_port;
Ben Lindstromb3921512001-04-11 15:57:50 +0000548 struct in_addr dest_addr;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000549 } s4_req, s4_rsp;
550
Ben Lindstromb3921512001-04-11 15:57:50 +0000551 debug2("channel %d: decode socks4", c->self);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000552
553 have = buffer_len(&c->input);
554 len = sizeof(s4_req);
555 if (have < len)
556 return 0;
557 p = buffer_ptr(&c->input);
558 for (found = 0, i = len; i < have; i++) {
559 if (p[i] == '\0') {
560 found = 1;
561 break;
562 }
563 if (i > 1024) {
564 /* the peer is probably sending garbage */
565 debug("channel %d: decode socks4: too long",
566 c->self);
567 return -1;
568 }
569 }
570 if (!found)
571 return 0;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000572 buffer_get(&c->input, (char *)&s4_req.version, 1);
573 buffer_get(&c->input, (char *)&s4_req.command, 1);
574 buffer_get(&c->input, (char *)&s4_req.dest_port, 2);
Ben Lindstromb3921512001-04-11 15:57:50 +0000575 buffer_get(&c->input, (char *)&s4_req.dest_addr, 4);
Ben Lindstrom2b261b92001-04-17 18:14:34 +0000576 have = buffer_len(&c->input);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000577 p = buffer_ptr(&c->input);
578 len = strlen(p);
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000579 debug2("channel %d: decode socks4: user %s/%d", c->self, p, len);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000580 if (len > have)
Ben Lindstromb3921512001-04-11 15:57:50 +0000581 fatal("channel %d: decode socks4: len %d > have %d",
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000582 c->self, len, have);
583 strlcpy(username, p, sizeof(username));
584 buffer_consume(&c->input, len);
585 buffer_consume(&c->input, 1); /* trailing '\0' */
586
Ben Lindstromb3921512001-04-11 15:57:50 +0000587 host = inet_ntoa(s4_req.dest_addr);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000588 strlcpy(c->path, host, sizeof(c->path));
589 c->host_port = ntohs(s4_req.dest_port);
590
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000591 debug("channel %d: dynamic request: socks4 host %s port %u command %u",
592 c->self, host, c->host_port, s4_req.command);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000593
Ben Lindstromb3921512001-04-11 15:57:50 +0000594 if (s4_req.command != 1) {
595 debug("channel %d: cannot handle: socks4 cn %d",
596 c->self, s4_req.command);
597 return -1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000598 }
Ben Lindstromb3921512001-04-11 15:57:50 +0000599 s4_rsp.version = 0; /* vn: 0 for reply */
600 s4_rsp.command = 90; /* cd: req granted */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000601 s4_rsp.dest_port = 0; /* ignored */
Ben Lindstromb3921512001-04-11 15:57:50 +0000602 s4_rsp.dest_addr.s_addr = INADDR_ANY; /* ignored */
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000603 buffer_append(&c->output, (char *)&s4_rsp, sizeof(s4_rsp));
Ben Lindstromb3921512001-04-11 15:57:50 +0000604 return 1;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000605}
606
Ben Lindstromb3921512001-04-11 15:57:50 +0000607/* dynamic port forwarding */
608void
609channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
610{
611 u_char *p;
612 int have, ret;
613
614 have = buffer_len(&c->input);
615
616 debug2("channel %d: pre_dynamic: have %d", c->self, have);
Ben Lindstromc486d882001-04-11 16:08:34 +0000617 /* buffer_dump(&c->input); */
Ben Lindstromb3921512001-04-11 15:57:50 +0000618 /* check if the fixed size part of the packet is in buffer. */
619 if (have < 4) {
620 /* need more */
621 FD_SET(c->sock, readset);
622 return;
623 }
624 /* try to guess the protocol */
625 p = buffer_ptr(&c->input);
626 switch (p[0]) {
Ben Lindstrom6fa9d102001-04-11 23:08:17 +0000627 case 0x04:
628 ret = channel_decode_socks4(c, readset, writeset);
629 break;
Ben Lindstromb3921512001-04-11 15:57:50 +0000630 default:
631 ret = -1;
632 break;
633 }
634 if (ret < 0) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000635 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +0000636 } else if (ret == 0) {
637 debug2("channel %d: pre_dynamic: need more", c->self);
638 /* need more */
639 FD_SET(c->sock, readset);
640 } else {
641 /* switch to the next state */
642 c->type = SSH_CHANNEL_OPENING;
643 port_open_helper(c, "direct-tcpip");
644 }
645}
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000646
Damien Millerb38eff82000-04-01 11:09:21 +1000647/* This is our fake X11 server socket. */
648void
649channel_post_x11_listener(Channel *c, fd_set * readset, fd_set * writeset)
650{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000651 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +1000652 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000653 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +1000654 socklen_t addrlen;
Damien Millerd83ff352001-01-30 09:19:34 +1100655 char buf[16384], *remote_ipaddr;
Damien Millerbd483e72000-04-30 10:00:53 +1000656 int remote_port;
Damien Millerb38eff82000-04-01 11:09:21 +1000657
658 if (FD_ISSET(c->sock, readset)) {
659 debug("X11 connection requested.");
660 addrlen = sizeof(addr);
661 newsock = accept(c->sock, &addr, &addrlen);
662 if (newsock < 0) {
663 error("accept: %.100s", strerror(errno));
664 return;
665 }
Damien Millerd83ff352001-01-30 09:19:34 +1100666 remote_ipaddr = get_peer_ipaddr(newsock);
Damien Millerbd483e72000-04-30 10:00:53 +1000667 remote_port = get_peer_port(newsock);
Damien Millerb38eff82000-04-01 11:09:21 +1000668 snprintf(buf, sizeof buf, "X11 connection from %.200s port %d",
Damien Millerd83ff352001-01-30 09:19:34 +1100669 remote_ipaddr, remote_port);
Damien Millerbd483e72000-04-30 10:00:53 +1000670
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000671 nc = channel_new("accepted x11 socket",
Damien Millerbd483e72000-04-30 10:00:53 +1000672 SSH_CHANNEL_OPENING, newsock, newsock, -1,
673 c->local_window_max, c->local_maxpacket,
Damien Miller69b69aa2000-10-28 14:19:58 +1100674 0, xstrdup(buf), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000675 if (nc == NULL) {
676 close(newsock);
677 xfree(remote_ipaddr);
678 return;
679 }
Damien Millerbd483e72000-04-30 10:00:53 +1000680 if (compat20) {
681 packet_start(SSH2_MSG_CHANNEL_OPEN);
682 packet_put_cstring("x11");
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000683 packet_put_int(nc->self);
Damien Millerbd483e72000-04-30 10:00:53 +1000684 packet_put_int(c->local_window_max);
685 packet_put_int(c->local_maxpacket);
Damien Millerd83ff352001-01-30 09:19:34 +1100686 /* originator ipaddr and port */
687 packet_put_cstring(remote_ipaddr);
Damien Miller30c3d422000-05-09 11:02:59 +1000688 if (datafellows & SSH_BUG_X11FWD) {
689 debug("ssh2 x11 bug compat mode");
690 } else {
691 packet_put_int(remote_port);
692 }
Damien Millerbd483e72000-04-30 10:00:53 +1000693 packet_send();
694 } else {
695 packet_start(SSH_SMSG_X11_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000696 packet_put_int(nc->self);
Damien Millerbd483e72000-04-30 10:00:53 +1000697 if (have_hostname_in_open)
698 packet_put_string(buf, strlen(buf));
699 packet_send();
700 }
Damien Millerd83ff352001-01-30 09:19:34 +1100701 xfree(remote_ipaddr);
Damien Millerb38eff82000-04-01 11:09:21 +1000702 }
703}
704
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000705void
706port_open_helper(Channel *c, char *rtype)
707{
708 int direct;
709 char buf[1024];
710 char *remote_ipaddr = get_peer_ipaddr(c->sock);
711 u_short remote_port = get_peer_port(c->sock);
712
713 direct = (strcmp(rtype, "direct-tcpip") == 0);
714
715 snprintf(buf, sizeof buf,
716 "%s: listening port %d for %.100s port %d, "
717 "connect from %.200s port %d",
718 rtype, c->listening_port, c->path, c->host_port,
719 remote_ipaddr, remote_port);
720
721 xfree(c->remote_name);
722 c->remote_name = xstrdup(buf);
723
724 if (compat20) {
725 packet_start(SSH2_MSG_CHANNEL_OPEN);
726 packet_put_cstring(rtype);
727 packet_put_int(c->self);
728 packet_put_int(c->local_window_max);
729 packet_put_int(c->local_maxpacket);
730 if (direct) {
731 /* target host, port */
732 packet_put_cstring(c->path);
733 packet_put_int(c->host_port);
734 } else {
735 /* listen address, port */
736 packet_put_cstring(c->path);
737 packet_put_int(c->listening_port);
738 }
739 /* originator host and port */
740 packet_put_cstring(remote_ipaddr);
741 packet_put_int(remote_port);
742 packet_send();
743 } else {
744 packet_start(SSH_MSG_PORT_OPEN);
745 packet_put_int(c->self);
746 packet_put_cstring(c->path);
747 packet_put_int(c->host_port);
748 if (have_hostname_in_open)
749 packet_put_cstring(c->remote_name);
750 packet_send();
751 }
752 xfree(remote_ipaddr);
753}
754
Damien Millerb38eff82000-04-01 11:09:21 +1000755/*
756 * This socket is listening for connections to a forwarded TCP/IP port.
757 */
758void
759channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
760{
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000761 Channel *nc;
Damien Millerb38eff82000-04-01 11:09:21 +1000762 struct sockaddr addr;
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000763 int newsock, nextstate;
Damien Millerb38eff82000-04-01 11:09:21 +1000764 socklen_t addrlen;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000765 char *rtype;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100766
Damien Millerb38eff82000-04-01 11:09:21 +1000767 if (FD_ISSET(c->sock, readset)) {
768 debug("Connection to port %d forwarding "
769 "to %.100s port %d requested.",
770 c->listening_port, c->path, c->host_port);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000771
772 rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ?
773 "forwarded-tcpip" : "direct-tcpip";
Ben Lindstrom6d618462001-05-10 23:24:49 +0000774 nextstate = (c->host_port == 0 &&
775 c->type != SSH_CHANNEL_RPORT_LISTENER) ?
776 SSH_CHANNEL_DYNAMIC : SSH_CHANNEL_OPENING;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000777
Damien Millerb38eff82000-04-01 11:09:21 +1000778 addrlen = sizeof(addr);
779 newsock = accept(c->sock, &addr, &addrlen);
780 if (newsock < 0) {
781 error("accept: %.100s", strerror(errno));
782 return;
783 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000784 nc = channel_new(rtype,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000785 nextstate, newsock, newsock, -1,
Damien Millerb38eff82000-04-01 11:09:21 +1000786 c->local_window_max, c->local_maxpacket,
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000787 0, xstrdup(rtype), 1);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000788 if (nc == NULL) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000789 error("channel_post_port_listener: no new channel:");
790 close(newsock);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000791 return;
Damien Millerb38eff82000-04-01 11:09:21 +1000792 }
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000793 nc->listening_port = c->listening_port;
794 nc->host_port = c->host_port;
795 strlcpy(nc->path, c->path, sizeof(nc->path));
796
797 if (nextstate != SSH_CHANNEL_DYNAMIC)
798 port_open_helper(nc, rtype);
Damien Millerb38eff82000-04-01 11:09:21 +1000799 }
800}
801
802/*
803 * This is the authentication agent socket listening for connections from
804 * clients.
805 */
806void
807channel_post_auth_listener(Channel *c, fd_set * readset, fd_set * writeset)
808{
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000809 Channel *nc;
810 int newsock;
Damien Millerb38eff82000-04-01 11:09:21 +1000811 struct sockaddr addr;
Damien Millerb38eff82000-04-01 11:09:21 +1000812 socklen_t addrlen;
813
814 if (FD_ISSET(c->sock, readset)) {
815 addrlen = sizeof(addr);
816 newsock = accept(c->sock, &addr, &addrlen);
817 if (newsock < 0) {
818 error("accept from auth socket: %.100s", strerror(errno));
819 return;
820 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000821 nc = channel_new("accepted auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +1100822 SSH_CHANNEL_OPENING, newsock, newsock, -1,
823 c->local_window_max, c->local_maxpacket,
824 0, xstrdup("accepted auth socket"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000825 if (nc == NULL) {
826 error("channel_post_auth_listener: channel_new failed");
827 close(newsock);
828 }
Damien Miller0bc1bd82000-11-13 22:57:25 +1100829 if (compat20) {
830 packet_start(SSH2_MSG_CHANNEL_OPEN);
831 packet_put_cstring("auth-agent@openssh.com");
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000832 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100833 packet_put_int(c->local_window_max);
834 packet_put_int(c->local_maxpacket);
835 } else {
836 packet_start(SSH_SMSG_AGENT_OPEN);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000837 packet_put_int(nc->self);
Damien Miller0bc1bd82000-11-13 22:57:25 +1100838 }
Damien Millerb38eff82000-04-01 11:09:21 +1000839 packet_send();
840 }
841}
842
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000843void
844channel_post_connecting(Channel *c, fd_set * readset, fd_set * writeset)
845{
Ben Lindstrom69128662001-05-08 20:07:39 +0000846 int err = 0;
847 int sz = sizeof(err);
848
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000849 if (FD_ISSET(c->sock, writeset)) {
Ben Lindstrom69128662001-05-08 20:07:39 +0000850 if (getsockopt(c->sock, SOL_SOCKET, SO_ERROR, (char *)&err,
851 &sz) < 0) {
852 err = errno;
853 error("getsockopt SO_ERROR failed");
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000854 }
Ben Lindstrom69128662001-05-08 20:07:39 +0000855 if (err == 0) {
856 debug("channel %d: connected", c->self);
857 c->type = SSH_CHANNEL_OPEN;
858 if (compat20) {
859 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
860 packet_put_int(c->remote_id);
861 packet_put_int(c->self);
862 packet_put_int(c->local_window);
863 packet_put_int(c->local_maxpacket);
864 } else {
865 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
866 packet_put_int(c->remote_id);
867 packet_put_int(c->self);
868 }
869 } else {
870 debug("channel %d: not connected: %s",
871 c->self, strerror(err));
872 if (compat20) {
873 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
874 packet_put_int(c->remote_id);
875 packet_put_int(SSH2_OPEN_CONNECT_FAILED);
876 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
877 packet_put_cstring(strerror(err));
878 packet_put_cstring("");
879 }
880 } else {
881 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
882 packet_put_int(c->remote_id);
883 }
884 chan_mark_dead(c);
885 }
886 packet_send();
Ben Lindstrom7ad97102000-12-06 01:42:49 +0000887 }
888}
889
Damien Millerb38eff82000-04-01 11:09:21 +1000890int
891channel_handle_rfd(Channel *c, fd_set * readset, fd_set * writeset)
892{
893 char buf[16*1024];
894 int len;
895
Ben Lindstromb6147ab2001-05-17 03:21:27 +0000896 if (c->istate == CHAN_INPUT_OPEN &&
Damien Millerb38eff82000-04-01 11:09:21 +1000897 FD_ISSET(c->rfd, readset)) {
898 len = read(c->rfd, buf, sizeof(buf));
Damien Miller6f83b8e2000-05-02 09:23:45 +1000899 if (len < 0 && (errno == EINTR || errno == EAGAIN))
900 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +1000901 if (len <= 0) {
Damien Millerbd483e72000-04-30 10:00:53 +1000902 debug("channel %d: read<=0 rfd %d len %d",
Damien Millerb38eff82000-04-01 11:09:21 +1000903 c->self, c->rfd, len);
Ben Lindstromb3921512001-04-11 15:57:50 +0000904 if (c->type != SSH_CHANNEL_OPEN) {
905 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000906 chan_mark_dead(c);
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +0000907 return -1;
Ben Lindstromb3921512001-04-11 15:57:50 +0000908 } else if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +1000909 buffer_consume(&c->output, buffer_len(&c->output));
910 c->type = SSH_CHANNEL_INPUT_DRAINING;
Ben Lindstromc486d882001-04-11 16:08:34 +0000911 debug("channel %d: status set to input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000912 } else {
913 chan_read_failed(c);
914 }
915 return -1;
916 }
Damien Millerad833b32000-08-23 10:46:23 +1000917 if(c->input_filter != NULL) {
918 if (c->input_filter(c, buf, len) == -1) {
Ben Lindstromc486d882001-04-11 16:08:34 +0000919 debug("channel %d: filter stops", c->self);
Damien Millerad833b32000-08-23 10:46:23 +1000920 chan_read_failed(c);
921 }
922 } else {
923 buffer_append(&c->input, buf, len);
924 }
Damien Millerb38eff82000-04-01 11:09:21 +1000925 }
926 return 1;
927}
928int
929channel_handle_wfd(Channel *c, fd_set * readset, fd_set * writeset)
930{
Ben Lindstrome229b252001-03-05 06:28:06 +0000931 struct termios tio;
Damien Millerb38eff82000-04-01 11:09:21 +1000932 int len;
933
934 /* Send buffered output data to the socket. */
Ben Lindstromb6147ab2001-05-17 03:21:27 +0000935 if ((c->ostate == CHAN_OUTPUT_OPEN ||
936 c->ostate == CHAN_OUTPUT_WAIT_DRAIN) &&
Damien Millerb38eff82000-04-01 11:09:21 +1000937 FD_ISSET(c->wfd, writeset) &&
938 buffer_len(&c->output) > 0) {
939 len = write(c->wfd, buffer_ptr(&c->output),
Damien Miller6f83b8e2000-05-02 09:23:45 +1000940 buffer_len(&c->output));
941 if (len < 0 && (errno == EINTR || errno == EAGAIN))
942 return 1;
Damien Millerb38eff82000-04-01 11:09:21 +1000943 if (len <= 0) {
Ben Lindstromb3921512001-04-11 15:57:50 +0000944 if (c->type != SSH_CHANNEL_OPEN) {
945 debug("channel %d: not open", c->self);
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000946 chan_mark_dead(c);
Ben Lindstromb3921512001-04-11 15:57:50 +0000947 return -1;
948 } else if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +1000949 buffer_consume(&c->output, buffer_len(&c->output));
Ben Lindstromc486d882001-04-11 16:08:34 +0000950 debug("channel %d: status set to input draining.", c->self);
Damien Millerb38eff82000-04-01 11:09:21 +1000951 c->type = SSH_CHANNEL_INPUT_DRAINING;
952 } else {
953 chan_write_failed(c);
954 }
955 return -1;
956 }
Damien Miller79438cc2001-02-16 12:34:57 +1100957 if (compat20 && c->isatty) {
Damien Miller79438cc2001-02-16 12:34:57 +1100958 if (tcgetattr(c->wfd, &tio) == 0 &&
959 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
960 /*
961 * Simulate echo to reduce the impact of
Ben Lindstromb40204b2001-03-05 06:29:44 +0000962 * traffic analysis. We need to match the
Ben Lindstrome229b252001-03-05 06:28:06 +0000963 * size of a SSH2_MSG_CHANNEL_DATA message
964 * (4 byte channel id + data)
Damien Miller79438cc2001-02-16 12:34:57 +1100965 */
Ben Lindstrome229b252001-03-05 06:28:06 +0000966 packet_send_ignore(4 + len);
Damien Miller79438cc2001-02-16 12:34:57 +1100967 packet_send();
Damien Miller79438cc2001-02-16 12:34:57 +1100968 }
969 }
Damien Millerb38eff82000-04-01 11:09:21 +1000970 buffer_consume(&c->output, len);
Damien Miller33b13562000-04-04 14:38:59 +1000971 if (compat20 && len > 0) {
972 c->local_consumed += len;
973 }
974 }
975 return 1;
976}
977int
978channel_handle_efd(Channel *c, fd_set * readset, fd_set * writeset)
979{
980 char buf[16*1024];
981 int len;
982
Damien Miller1383bd82000-04-06 12:32:37 +1000983/** XXX handle drain efd, too */
Damien Miller33b13562000-04-04 14:38:59 +1000984 if (c->efd != -1) {
985 if (c->extended_usage == CHAN_EXTENDED_WRITE &&
986 FD_ISSET(c->efd, writeset) &&
987 buffer_len(&c->extended) > 0) {
988 len = write(c->efd, buffer_ptr(&c->extended),
989 buffer_len(&c->extended));
Damien Millerd3444942000-09-30 14:20:03 +1100990 debug2("channel %d: written %d to efd %d",
Damien Miller33b13562000-04-04 14:38:59 +1000991 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +0000992 if (len < 0 && (errno == EINTR || errno == EAGAIN))
993 return 1;
994 if (len <= 0) {
995 debug2("channel %d: closing write-efd %d",
996 c->self, c->efd);
997 close(c->efd);
998 c->efd = -1;
999 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001000 buffer_consume(&c->extended, len);
1001 c->local_consumed += len;
1002 }
1003 } else if (c->extended_usage == CHAN_EXTENDED_READ &&
1004 FD_ISSET(c->efd, readset)) {
1005 len = read(c->efd, buf, sizeof(buf));
Damien Millerd3444942000-09-30 14:20:03 +11001006 debug2("channel %d: read %d from efd %d",
Damien Miller33b13562000-04-04 14:38:59 +10001007 c->self, len, c->efd);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001008 if (len < 0 && (errno == EINTR || errno == EAGAIN))
1009 return 1;
1010 if (len <= 0) {
1011 debug2("channel %d: closing read-efd %d",
Damien Miller1383bd82000-04-06 12:32:37 +10001012 c->self, c->efd);
1013 close(c->efd);
1014 c->efd = -1;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001015 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001016 buffer_append(&c->extended, buf, len);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001017 }
Damien Miller33b13562000-04-04 14:38:59 +10001018 }
1019 }
1020 return 1;
1021}
1022int
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001023channel_check_window(Channel *c)
Damien Miller33b13562000-04-04 14:38:59 +10001024{
Ben Lindstromb3921512001-04-11 15:57:50 +00001025 if (c->type == SSH_CHANNEL_OPEN &&
1026 !(c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD)) &&
Damien Miller33b13562000-04-04 14:38:59 +10001027 c->local_window < c->local_window_max/2 &&
1028 c->local_consumed > 0) {
1029 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
1030 packet_put_int(c->remote_id);
1031 packet_put_int(c->local_consumed);
1032 packet_send();
Damien Millerd3444942000-09-30 14:20:03 +11001033 debug2("channel %d: window %d sent adjust %d",
Damien Miller33b13562000-04-04 14:38:59 +10001034 c->self, c->local_window,
1035 c->local_consumed);
1036 c->local_window += c->local_consumed;
1037 c->local_consumed = 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001038 }
1039 return 1;
1040}
1041
1042void
1043channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
1044{
1045 channel_handle_rfd(c, readset, writeset);
1046 channel_handle_wfd(c, readset, writeset);
1047}
1048
1049void
Damien Miller33b13562000-04-04 14:38:59 +10001050channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
1051{
1052 channel_handle_rfd(c, readset, writeset);
1053 channel_handle_wfd(c, readset, writeset);
1054 channel_handle_efd(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001055
1056 channel_check_window(c);
Damien Miller33b13562000-04-04 14:38:59 +10001057}
1058
1059void
Damien Millerb38eff82000-04-01 11:09:21 +10001060channel_post_output_drain_13(Channel *c, fd_set * readset, fd_set * writeset)
1061{
1062 int len;
1063 /* Send buffered output data to the socket. */
1064 if (FD_ISSET(c->sock, writeset) && buffer_len(&c->output) > 0) {
1065 len = write(c->sock, buffer_ptr(&c->output),
1066 buffer_len(&c->output));
1067 if (len <= 0)
1068 buffer_consume(&c->output, buffer_len(&c->output));
1069 else
1070 buffer_consume(&c->output, len);
1071 }
1072}
1073
1074void
Damien Miller33b13562000-04-04 14:38:59 +10001075channel_handler_init_20(void)
1076{
1077 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_20;
Damien Millerbd483e72000-04-30 10:00:53 +10001078 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Miller33b13562000-04-04 14:38:59 +10001079 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001080 channel_pre[SSH_CHANNEL_RPORT_LISTENER] = &channel_pre_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001081 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001082 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001083 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001084 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Miller33b13562000-04-04 14:38:59 +10001085
1086 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_2;
1087 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001088 channel_post[SSH_CHANNEL_RPORT_LISTENER] = &channel_post_port_listener;
Damien Millerbd483e72000-04-30 10:00:53 +10001089 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001090 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001091 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Ben Lindstromb3921512001-04-11 15:57:50 +00001092 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_2;
Damien Miller33b13562000-04-04 14:38:59 +10001093}
1094
1095void
Damien Millerb38eff82000-04-01 11:09:21 +10001096channel_handler_init_13(void)
1097{
1098 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_13;
1099 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open_13;
1100 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1101 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1102 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
1103 channel_pre[SSH_CHANNEL_INPUT_DRAINING] = &channel_pre_input_draining;
1104 channel_pre[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_pre_output_draining;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001105 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001106 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001107
1108 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
1109 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1110 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1111 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1112 channel_post[SSH_CHANNEL_OUTPUT_DRAINING] = &channel_post_output_drain_13;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001113 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Ben Lindstromb3921512001-04-11 15:57:50 +00001114 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
Damien Millerb38eff82000-04-01 11:09:21 +10001115}
1116
1117void
1118channel_handler_init_15(void)
1119{
1120 channel_pre[SSH_CHANNEL_OPEN] = &channel_pre_open_15;
Damien Millerbd483e72000-04-30 10:00:53 +10001121 channel_pre[SSH_CHANNEL_X11_OPEN] = &channel_pre_x11_open;
Damien Millerb38eff82000-04-01 11:09:21 +10001122 channel_pre[SSH_CHANNEL_X11_LISTENER] = &channel_pre_listener;
1123 channel_pre[SSH_CHANNEL_PORT_LISTENER] = &channel_pre_listener;
1124 channel_pre[SSH_CHANNEL_AUTH_SOCKET] = &channel_pre_listener;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001125 channel_pre[SSH_CHANNEL_CONNECTING] = &channel_pre_connecting;
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001126 channel_pre[SSH_CHANNEL_DYNAMIC] = &channel_pre_dynamic;
Damien Millerb38eff82000-04-01 11:09:21 +10001127
1128 channel_post[SSH_CHANNEL_X11_LISTENER] = &channel_post_x11_listener;
1129 channel_post[SSH_CHANNEL_PORT_LISTENER] = &channel_post_port_listener;
1130 channel_post[SSH_CHANNEL_AUTH_SOCKET] = &channel_post_auth_listener;
1131 channel_post[SSH_CHANNEL_OPEN] = &channel_post_open_1;
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001132 channel_post[SSH_CHANNEL_CONNECTING] = &channel_post_connecting;
Ben Lindstromb3921512001-04-11 15:57:50 +00001133 channel_post[SSH_CHANNEL_DYNAMIC] = &channel_post_open_1;
Damien Millerb38eff82000-04-01 11:09:21 +10001134}
1135
1136void
1137channel_handler_init(void)
1138{
1139 int i;
1140 for(i = 0; i < SSH_CHANNEL_MAX_TYPE; i++) {
1141 channel_pre[i] = NULL;
1142 channel_post[i] = NULL;
1143 }
Damien Miller33b13562000-04-04 14:38:59 +10001144 if (compat20)
1145 channel_handler_init_20();
1146 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001147 channel_handler_init_13();
1148 else
1149 channel_handler_init_15();
1150}
1151
Damien Miller4af51302000-04-16 11:18:38 +10001152void
Damien Millerb38eff82000-04-01 11:09:21 +10001153channel_handler(chan_fn *ftab[], fd_set * readset, fd_set * writeset)
1154{
1155 static int did_init = 0;
1156 int i;
1157 Channel *c;
1158
1159 if (!did_init) {
1160 channel_handler_init();
1161 did_init = 1;
1162 }
1163 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001164 c = channels[i];
1165 if (c == NULL)
Damien Millerb38eff82000-04-01 11:09:21 +10001166 continue;
1167 if (ftab[c->type] == NULL)
1168 continue;
1169 (*ftab[c->type])(c, readset, writeset);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001170 if (chan_is_dead(c)) {
1171 /*
1172 * we have to remove the fd's from the select mask
1173 * before the channels are free'd and the fd's are
1174 * closed
1175 */
1176 if (c->wfd != -1)
1177 FD_CLR(c->wfd, writeset);
1178 if (c->rfd != -1)
1179 FD_CLR(c->rfd, readset);
1180 if (c->efd != -1) {
1181 if (c->extended_usage == CHAN_EXTENDED_READ)
1182 FD_CLR(c->efd, readset);
1183 if (c->extended_usage == CHAN_EXTENDED_WRITE)
1184 FD_CLR(c->efd, writeset);
1185 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001186 channel_free(c);
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001187 }
Damien Millerb38eff82000-04-01 11:09:21 +10001188 }
1189}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001190
Damien Miller4af51302000-04-16 11:18:38 +10001191void
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001192channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
1193 int rekeying)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001194{
Damien Miller5e953212001-01-30 09:14:00 +11001195 int n;
1196 u_int sz;
1197
1198 n = MAX(*maxfdp, channel_max_fd);
1199
1200 sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1201 if (*readsetp == NULL || n > *maxfdp) {
1202 if (*readsetp)
1203 xfree(*readsetp);
1204 if (*writesetp)
1205 xfree(*writesetp);
1206 *readsetp = xmalloc(sz);
1207 *writesetp = xmalloc(sz);
1208 *maxfdp = n;
1209 }
1210 memset(*readsetp, 0, sz);
1211 memset(*writesetp, 0, sz);
1212
Ben Lindstrombe2cc432001-04-04 23:46:07 +00001213 if (!rekeying)
1214 channel_handler(channel_pre, *readsetp, *writesetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001215}
1216
Damien Miller4af51302000-04-16 11:18:38 +10001217void
Damien Miller95def091999-11-25 00:26:21 +11001218channel_after_select(fd_set * readset, fd_set * writeset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001219{
Damien Millerb38eff82000-04-01 11:09:21 +10001220 channel_handler(channel_post, readset, writeset);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001221}
1222
Damien Miller5e953212001-01-30 09:14:00 +11001223/* If there is data to send to the connection, enqueue some of it now. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001224
Damien Miller4af51302000-04-16 11:18:38 +10001225void
Damien Miller95def091999-11-25 00:26:21 +11001226channel_output_poll()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001227{
Damien Miller95def091999-11-25 00:26:21 +11001228 int len, i;
Damien Millerb38eff82000-04-01 11:09:21 +10001229 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001230
Damien Miller95def091999-11-25 00:26:21 +11001231 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001232
1233 c = channels[i];
1234 if (c == NULL)
1235 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001236
Damien Miller5428f641999-11-25 11:54:57 +11001237 /* We are only interested in channels that can have buffered incoming data. */
Damien Miller34132e52000-01-14 15:45:46 +11001238 if (compat13) {
Damien Millerb38eff82000-04-01 11:09:21 +10001239 if (c->type != SSH_CHANNEL_OPEN &&
1240 c->type != SSH_CHANNEL_INPUT_DRAINING)
Damien Miller34132e52000-01-14 15:45:46 +11001241 continue;
1242 } else {
Damien Millerb38eff82000-04-01 11:09:21 +10001243 if (c->type != SSH_CHANNEL_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001244 continue;
Damien Miller34132e52000-01-14 15:45:46 +11001245 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001246 if (compat20 &&
1247 (c->flags & (CHAN_CLOSE_SENT|CHAN_CLOSE_RCVD))) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001248 /* XXX is this true? */
Ben Lindstromb1131e92001-03-05 07:27:13 +00001249 debug2("channel %d: no data after CLOSE", c->self);
Damien Miller33b13562000-04-04 14:38:59 +10001250 continue;
1251 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001252
Damien Miller95def091999-11-25 00:26:21 +11001253 /* Get the amount of buffered data for this channel. */
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001254 if ((c->istate == CHAN_INPUT_OPEN ||
1255 c->istate == CHAN_INPUT_WAIT_DRAIN) &&
1256 (len = buffer_len(&c->input)) > 0) {
Damien Miller5428f641999-11-25 11:54:57 +11001257 /* Send some data for the other side over the secure connection. */
Damien Miller33b13562000-04-04 14:38:59 +10001258 if (compat20) {
1259 if (len > c->remote_window)
1260 len = c->remote_window;
1261 if (len > c->remote_maxpacket)
1262 len = c->remote_maxpacket;
Damien Miller95def091999-11-25 00:26:21 +11001263 } else {
Damien Miller33b13562000-04-04 14:38:59 +10001264 if (packet_is_interactive()) {
1265 if (len > 1024)
1266 len = 512;
1267 } else {
1268 /* Keep the packets at reasonable size. */
1269 if (len > packet_get_maxsize()/2)
1270 len = packet_get_maxsize()/2;
1271 }
Damien Miller95def091999-11-25 00:26:21 +11001272 }
Damien Millerb38eff82000-04-01 11:09:21 +10001273 if (len > 0) {
Damien Miller33b13562000-04-04 14:38:59 +10001274 packet_start(compat20 ?
1275 SSH2_MSG_CHANNEL_DATA : SSH_MSG_CHANNEL_DATA);
Damien Millerb38eff82000-04-01 11:09:21 +10001276 packet_put_int(c->remote_id);
1277 packet_put_string(buffer_ptr(&c->input), len);
1278 packet_send();
1279 buffer_consume(&c->input, len);
1280 c->remote_window -= len;
Damien Millerb38eff82000-04-01 11:09:21 +10001281 }
1282 } else if (c->istate == CHAN_INPUT_WAIT_DRAIN) {
Damien Miller95def091999-11-25 00:26:21 +11001283 if (compat13)
1284 fatal("cannot happen: istate == INPUT_WAIT_DRAIN for proto 1.3");
Damien Miller5428f641999-11-25 11:54:57 +11001285 /*
1286 * input-buffer is empty and read-socket shutdown:
1287 * tell peer, that we will not send more data: send IEOF
1288 */
Damien Millerb38eff82000-04-01 11:09:21 +10001289 chan_ibuf_empty(c);
Damien Miller95def091999-11-25 00:26:21 +11001290 }
Damien Miller33b13562000-04-04 14:38:59 +10001291 /* Send extended data, i.e. stderr */
1292 if (compat20 &&
1293 c->remote_window > 0 &&
1294 (len = buffer_len(&c->extended)) > 0 &&
1295 c->extended_usage == CHAN_EXTENDED_READ) {
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001296 debug2("channel %d: rwin %d elen %d euse %d",
1297 c->self, c->remote_window, buffer_len(&c->extended),
1298 c->extended_usage);
Damien Miller33b13562000-04-04 14:38:59 +10001299 if (len > c->remote_window)
1300 len = c->remote_window;
1301 if (len > c->remote_maxpacket)
1302 len = c->remote_maxpacket;
1303 packet_start(SSH2_MSG_CHANNEL_EXTENDED_DATA);
1304 packet_put_int(c->remote_id);
1305 packet_put_int(SSH2_EXTENDED_DATA_STDERR);
1306 packet_put_string(buffer_ptr(&c->extended), len);
1307 packet_send();
1308 buffer_consume(&c->extended, len);
1309 c->remote_window -= len;
Ben Lindstrom7fbd4552001-03-05 06:16:11 +00001310 debug2("channel %d: sent ext data %d", c->self, len);
Damien Miller33b13562000-04-04 14:38:59 +10001311 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001312 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001313}
1314
Damien Miller5428f641999-11-25 11:54:57 +11001315/*
1316 * This is called when a packet of type CHANNEL_DATA has just been received.
1317 * The message type has already been consumed, but channel number and data is
1318 * still there.
1319 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001320
Damien Miller4af51302000-04-16 11:18:38 +10001321void
Damien Miller62cee002000-09-23 17:15:56 +11001322channel_input_data(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001323{
Damien Miller34132e52000-01-14 15:45:46 +11001324 int id;
Damien Miller95def091999-11-25 00:26:21 +11001325 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001326 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +10001327 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001328
Damien Miller95def091999-11-25 00:26:21 +11001329 /* Get the channel number and verify it. */
Damien Miller34132e52000-01-14 15:45:46 +11001330 id = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +10001331 c = channel_lookup(id);
1332 if (c == NULL)
Damien Miller34132e52000-01-14 15:45:46 +11001333 packet_disconnect("Received data for nonexistent channel %d.", id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001334
Damien Miller95def091999-11-25 00:26:21 +11001335 /* Ignore any data for non-open channels (might happen on close) */
Damien Millerb38eff82000-04-01 11:09:21 +10001336 if (c->type != SSH_CHANNEL_OPEN &&
1337 c->type != SSH_CHANNEL_X11_OPEN)
Damien Miller34132e52000-01-14 15:45:46 +11001338 return;
1339
1340 /* same for protocol 1.5 if output end is no longer open */
Damien Millerb38eff82000-04-01 11:09:21 +10001341 if (!compat13 && c->ostate != CHAN_OUTPUT_OPEN)
Damien Miller95def091999-11-25 00:26:21 +11001342 return;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001343
Damien Miller95def091999-11-25 00:26:21 +11001344 /* Get the data. */
1345 data = packet_get_string(&data_len);
Damien Miller4af51302000-04-16 11:18:38 +10001346 packet_done();
Damien Millerb38eff82000-04-01 11:09:21 +10001347
Damien Miller33b13562000-04-04 14:38:59 +10001348 if (compat20){
1349 if (data_len > c->local_maxpacket) {
1350 log("channel %d: rcvd big packet %d, maxpack %d",
1351 c->self, data_len, c->local_maxpacket);
1352 }
1353 if (data_len > c->local_window) {
1354 log("channel %d: rcvd too much data %d, win %d",
1355 c->self, data_len, c->local_window);
1356 xfree(data);
1357 return;
1358 }
1359 c->local_window -= data_len;
1360 }else{
1361 packet_integrity_check(plen, 4 + 4 + data_len, type);
1362 }
Damien Millerb38eff82000-04-01 11:09:21 +10001363 buffer_append(&c->output, data, data_len);
Damien Miller95def091999-11-25 00:26:21 +11001364 xfree(data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001365}
Damien Miller4af51302000-04-16 11:18:38 +10001366void
Damien Miller62cee002000-09-23 17:15:56 +11001367channel_input_extended_data(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001368{
1369 int id;
1370 int tcode;
1371 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +00001372 u_int data_len;
Damien Miller33b13562000-04-04 14:38:59 +10001373 Channel *c;
1374
1375 /* Get the channel number and verify it. */
1376 id = packet_get_int();
1377 c = channel_lookup(id);
1378
1379 if (c == NULL)
1380 packet_disconnect("Received extended_data for bad channel %d.", id);
1381 if (c->type != SSH_CHANNEL_OPEN) {
1382 log("channel %d: ext data for non open", id);
1383 return;
1384 }
1385 tcode = packet_get_int();
1386 if (c->efd == -1 ||
1387 c->extended_usage != CHAN_EXTENDED_WRITE ||
1388 tcode != SSH2_EXTENDED_DATA_STDERR) {
1389 log("channel %d: bad ext data", c->self);
1390 return;
1391 }
1392 data = packet_get_string(&data_len);
Damien Miller4af51302000-04-16 11:18:38 +10001393 packet_done();
Damien Miller33b13562000-04-04 14:38:59 +10001394 if (data_len > c->local_window) {
1395 log("channel %d: rcvd too much extended_data %d, win %d",
1396 c->self, data_len, c->local_window);
1397 xfree(data);
1398 return;
1399 }
Damien Millerd3444942000-09-30 14:20:03 +11001400 debug2("channel %d: rcvd ext data %d", c->self, data_len);
Damien Miller33b13562000-04-04 14:38:59 +10001401 c->local_window -= data_len;
1402 buffer_append(&c->extended, data, data_len);
1403 xfree(data);
1404}
1405
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001406
Damien Miller5428f641999-11-25 11:54:57 +11001407/*
1408 * Returns true if no channel has too much buffered data, and false if one or
1409 * more channel is overfull.
1410 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001411
Damien Miller4af51302000-04-16 11:18:38 +10001412int
Damien Miller95def091999-11-25 00:26:21 +11001413channel_not_very_much_buffered_data()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001414{
Ben Lindstrom46c16222000-12-22 01:43:59 +00001415 u_int i;
Damien Millerb38eff82000-04-01 11:09:21 +10001416 Channel *c;
Damien Miller95def091999-11-25 00:26:21 +11001417
1418 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001419 c = channels[i];
1420 if (c != NULL && c->type == SSH_CHANNEL_OPEN) {
Damien Miller33b13562000-04-04 14:38:59 +10001421 if (!compat20 && buffer_len(&c->input) > packet_get_maxsize()) {
Damien Millerb38eff82000-04-01 11:09:21 +10001422 debug("channel %d: big input buffer %d",
1423 c->self, buffer_len(&c->input));
Damien Miller95def091999-11-25 00:26:21 +11001424 return 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001425 }
1426 if (buffer_len(&c->output) > packet_get_maxsize()) {
1427 debug("channel %d: big output buffer %d",
1428 c->self, buffer_len(&c->output));
Damien Miller95def091999-11-25 00:26:21 +11001429 return 0;
Damien Millerb38eff82000-04-01 11:09:21 +10001430 }
Damien Miller95def091999-11-25 00:26:21 +11001431 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001432 }
Damien Miller95def091999-11-25 00:26:21 +11001433 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001434}
1435
Damien Miller4af51302000-04-16 11:18:38 +10001436void
Damien Miller62cee002000-09-23 17:15:56 +11001437channel_input_ieof(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001438{
1439 int id;
1440 Channel *c;
1441
1442 packet_integrity_check(plen, 4, type);
1443
1444 id = packet_get_int();
1445 c = channel_lookup(id);
1446 if (c == NULL)
1447 packet_disconnect("Received ieof for nonexistent channel %d.", id);
1448 chan_rcvd_ieof(c);
1449}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001450
Damien Miller4af51302000-04-16 11:18:38 +10001451void
Damien Miller62cee002000-09-23 17:15:56 +11001452channel_input_close(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001453{
Damien Millerb38eff82000-04-01 11:09:21 +10001454 int id;
1455 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001456
Damien Millerb38eff82000-04-01 11:09:21 +10001457 packet_integrity_check(plen, 4, type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001458
Damien Millerb38eff82000-04-01 11:09:21 +10001459 id = packet_get_int();
1460 c = channel_lookup(id);
1461 if (c == NULL)
1462 packet_disconnect("Received close for nonexistent channel %d.", id);
Damien Miller5428f641999-11-25 11:54:57 +11001463
1464 /*
1465 * Send a confirmation that we have closed the channel and no more
1466 * data is coming for it.
1467 */
Damien Miller95def091999-11-25 00:26:21 +11001468 packet_start(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION);
Damien Millerb38eff82000-04-01 11:09:21 +10001469 packet_put_int(c->remote_id);
Damien Miller95def091999-11-25 00:26:21 +11001470 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001471
Damien Miller5428f641999-11-25 11:54:57 +11001472 /*
1473 * If the channel is in closed state, we have sent a close request,
1474 * and the other side will eventually respond with a confirmation.
1475 * Thus, we cannot free the channel here, because then there would be
1476 * no-one to receive the confirmation. The channel gets freed when
1477 * the confirmation arrives.
1478 */
Damien Millerb38eff82000-04-01 11:09:21 +10001479 if (c->type != SSH_CHANNEL_CLOSED) {
Damien Miller5428f641999-11-25 11:54:57 +11001480 /*
1481 * Not a closed channel - mark it as draining, which will
1482 * cause it to be freed later.
1483 */
Damien Millerb38eff82000-04-01 11:09:21 +10001484 buffer_consume(&c->input, buffer_len(&c->input));
1485 c->type = SSH_CHANNEL_OUTPUT_DRAINING;
Damien Miller95def091999-11-25 00:26:21 +11001486 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001487}
1488
Damien Millerb38eff82000-04-01 11:09:21 +10001489/* proto version 1.5 overloads CLOSE_CONFIRMATION with OCLOSE */
Damien Miller4af51302000-04-16 11:18:38 +10001490void
Damien Miller62cee002000-09-23 17:15:56 +11001491channel_input_oclose(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001492{
Damien Millerb38eff82000-04-01 11:09:21 +10001493 int id = packet_get_int();
1494 Channel *c = channel_lookup(id);
1495 packet_integrity_check(plen, 4, type);
1496 if (c == NULL)
1497 packet_disconnect("Received oclose for nonexistent channel %d.", id);
1498 chan_rcvd_oclose(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001499}
1500
Damien Miller4af51302000-04-16 11:18:38 +10001501void
Damien Miller62cee002000-09-23 17:15:56 +11001502channel_input_close_confirmation(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10001503{
1504 int id = packet_get_int();
1505 Channel *c = channel_lookup(id);
1506
Damien Miller4af51302000-04-16 11:18:38 +10001507 packet_done();
Damien Millerb38eff82000-04-01 11:09:21 +10001508 if (c == NULL)
1509 packet_disconnect("Received close confirmation for "
1510 "out-of-range channel %d.", id);
1511 if (c->type != SSH_CHANNEL_CLOSED)
1512 packet_disconnect("Received close confirmation for "
1513 "non-closed channel %d (type %d).", id, c->type);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001514 channel_free(c);
Damien Millerb38eff82000-04-01 11:09:21 +10001515}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001516
Damien Miller4af51302000-04-16 11:18:38 +10001517void
Damien Miller62cee002000-09-23 17:15:56 +11001518channel_input_open_confirmation(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001519{
Damien Millerb38eff82000-04-01 11:09:21 +10001520 int id, remote_id;
1521 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001522
Damien Miller33b13562000-04-04 14:38:59 +10001523 if (!compat20)
1524 packet_integrity_check(plen, 4 + 4, type);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001525
Damien Millerb38eff82000-04-01 11:09:21 +10001526 id = packet_get_int();
1527 c = channel_lookup(id);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001528
Damien Millerb38eff82000-04-01 11:09:21 +10001529 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1530 packet_disconnect("Received open confirmation for "
1531 "non-opening channel %d.", id);
1532 remote_id = packet_get_int();
Damien Miller5428f641999-11-25 11:54:57 +11001533 /* Record the remote channel number and mark that the channel is now open. */
Damien Millerb38eff82000-04-01 11:09:21 +10001534 c->remote_id = remote_id;
1535 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10001536
1537 if (compat20) {
1538 c->remote_window = packet_get_int();
1539 c->remote_maxpacket = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10001540 packet_done();
Damien Miller33b13562000-04-04 14:38:59 +10001541 if (c->cb_fn != NULL && c->cb_event == type) {
Damien Millerd3444942000-09-30 14:20:03 +11001542 debug2("callback start");
Damien Miller33b13562000-04-04 14:38:59 +10001543 c->cb_fn(c->self, c->cb_arg);
Damien Millerd3444942000-09-30 14:20:03 +11001544 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001545 }
1546 debug("channel %d: open confirm rwindow %d rmax %d", c->self,
1547 c->remote_window, c->remote_maxpacket);
1548 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001549}
1550
Ben Lindstrom69128662001-05-08 20:07:39 +00001551char *
1552reason2txt(int reason)
1553{
1554 switch(reason) {
1555 case SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED:
1556 return "administratively prohibited";
1557 case SSH2_OPEN_CONNECT_FAILED:
1558 return "connect failed";
1559 case SSH2_OPEN_UNKNOWN_CHANNEL_TYPE:
1560 return "unknown channel type";
1561 case SSH2_OPEN_RESOURCE_SHORTAGE:
1562 return "resource shortage";
1563 }
1564 return "unkown reason";
1565}
1566
Damien Miller4af51302000-04-16 11:18:38 +10001567void
Damien Miller62cee002000-09-23 17:15:56 +11001568channel_input_open_failure(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001569{
Kevin Steves12057502001-02-05 14:54:34 +00001570 int id, reason;
1571 char *msg = NULL, *lang = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10001572 Channel *c;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001573
Damien Miller33b13562000-04-04 14:38:59 +10001574 if (!compat20)
1575 packet_integrity_check(plen, 4, type);
Damien Millerb38eff82000-04-01 11:09:21 +10001576
1577 id = packet_get_int();
1578 c = channel_lookup(id);
1579
1580 if (c==NULL || c->type != SSH_CHANNEL_OPENING)
1581 packet_disconnect("Received open failure for "
1582 "non-opening channel %d.", id);
Damien Miller33b13562000-04-04 14:38:59 +10001583 if (compat20) {
Kevin Steves12057502001-02-05 14:54:34 +00001584 reason = packet_get_int();
Ben Lindstromf3436742001-04-29 19:52:00 +00001585 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Kevin Steves12057502001-02-05 14:54:34 +00001586 msg = packet_get_string(NULL);
1587 lang = packet_get_string(NULL);
1588 }
Damien Miller4af51302000-04-16 11:18:38 +10001589 packet_done();
Ben Lindstrom69128662001-05-08 20:07:39 +00001590 log("channel %d: open failed: %s%s%s", id,
1591 reason2txt(reason), msg ? ": ": "", msg ? msg : "");
Kevin Steves12057502001-02-05 14:54:34 +00001592 if (msg != NULL)
1593 xfree(msg);
1594 if (lang != NULL)
1595 xfree(lang);
Damien Miller33b13562000-04-04 14:38:59 +10001596 }
Damien Miller95def091999-11-25 00:26:21 +11001597 /* Free the channel. This will also close the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001598 channel_free(c);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001599}
1600
Damien Miller33b13562000-04-04 14:38:59 +10001601void
Damien Miller62cee002000-09-23 17:15:56 +11001602channel_input_channel_request(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001603{
1604 int id;
1605 Channel *c;
1606
1607 id = packet_get_int();
1608 c = channel_lookup(id);
1609
1610 if (c == NULL ||
1611 (c->type != SSH_CHANNEL_OPEN && c->type != SSH_CHANNEL_LARVAL))
1612 packet_disconnect("Received request for "
1613 "non-open channel %d.", id);
1614 if (c->cb_fn != NULL && c->cb_event == type) {
Damien Millerd3444942000-09-30 14:20:03 +11001615 debug2("callback start");
Damien Miller33b13562000-04-04 14:38:59 +10001616 c->cb_fn(c->self, c->cb_arg);
Damien Millerd3444942000-09-30 14:20:03 +11001617 debug2("callback done");
Damien Miller33b13562000-04-04 14:38:59 +10001618 } else {
1619 char *service = packet_get_string(NULL);
Ben Lindstromcc74df72001-03-05 06:20:14 +00001620 debug("channel %d: rcvd request for %s", c->self, service);
Damien Millerd3444942000-09-30 14:20:03 +11001621 debug("cb_fn %p cb_event %d", c->cb_fn , c->cb_event);
Damien Miller33b13562000-04-04 14:38:59 +10001622 xfree(service);
1623 }
1624}
1625
Damien Miller4af51302000-04-16 11:18:38 +10001626void
Damien Miller62cee002000-09-23 17:15:56 +11001627channel_input_window_adjust(int type, int plen, void *ctxt)
Damien Miller33b13562000-04-04 14:38:59 +10001628{
1629 Channel *c;
1630 int id, adjust;
1631
1632 if (!compat20)
1633 return;
1634
1635 /* Get the channel number and verify it. */
1636 id = packet_get_int();
1637 c = channel_lookup(id);
1638
1639 if (c == NULL || c->type != SSH_CHANNEL_OPEN) {
1640 log("Received window adjust for "
1641 "non-open channel %d.", id);
1642 return;
1643 }
1644 adjust = packet_get_int();
Damien Miller4af51302000-04-16 11:18:38 +10001645 packet_done();
Damien Millerd3444942000-09-30 14:20:03 +11001646 debug2("channel %d: rcvd adjust %d", id, adjust);
Damien Miller33b13562000-04-04 14:38:59 +10001647 c->remote_window += adjust;
1648}
1649
Damien Miller5428f641999-11-25 11:54:57 +11001650/*
1651 * Stops listening for channels, and removes any unix domain sockets that we
1652 * might have.
1653 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001654
Damien Miller4af51302000-04-16 11:18:38 +10001655void
Damien Miller95def091999-11-25 00:26:21 +11001656channel_stop_listening()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001657{
Damien Miller95def091999-11-25 00:26:21 +11001658 int i;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001659 Channel *c;
1660
Damien Miller95def091999-11-25 00:26:21 +11001661 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001662 c = channels[i];
1663 if (c != NULL) {
1664 switch (c->type) {
1665 case SSH_CHANNEL_AUTH_SOCKET:
1666 close(c->sock);
1667 unlink(c->path);
1668 channel_free(c);
1669 break;
1670 case SSH_CHANNEL_PORT_LISTENER:
1671 case SSH_CHANNEL_RPORT_LISTENER:
1672 case SSH_CHANNEL_X11_LISTENER:
1673 close(c->sock);
1674 channel_free(c);
1675 break;
1676 default:
1677 break;
1678 }
Damien Miller95def091999-11-25 00:26:21 +11001679 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001680 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001681}
1682
Damien Miller5428f641999-11-25 11:54:57 +11001683/*
Damien Miller6f83b8e2000-05-02 09:23:45 +10001684 * Closes the sockets/fds of all channels. This is used to close extra file
Damien Miller5428f641999-11-25 11:54:57 +11001685 * descriptors after a fork.
1686 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001687
Damien Miller4af51302000-04-16 11:18:38 +10001688void
Damien Miller95def091999-11-25 00:26:21 +11001689channel_close_all()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001690{
Damien Miller95def091999-11-25 00:26:21 +11001691 int i;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001692
Damien Miller6f83b8e2000-05-02 09:23:45 +10001693 for (i = 0; i < channels_alloc; i++)
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001694 if (channels[i] != NULL)
1695 channel_close_fds(channels[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001696}
1697
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001698/* Returns true if any channel is still open. */
1699
Damien Miller4af51302000-04-16 11:18:38 +10001700int
Damien Miller95def091999-11-25 00:26:21 +11001701channel_still_open()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001702{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001703 int i;
1704 Channel *c;
1705
1706 for (i = 0; i < channels_alloc; i++) {
1707 c = channels[i];
1708 if (c == NULL)
1709 continue;
1710 switch (c->type) {
Damien Miller95def091999-11-25 00:26:21 +11001711 case SSH_CHANNEL_X11_LISTENER:
1712 case SSH_CHANNEL_PORT_LISTENER:
Damien Miller0bc1bd82000-11-13 22:57:25 +11001713 case SSH_CHANNEL_RPORT_LISTENER:
Damien Miller95def091999-11-25 00:26:21 +11001714 case SSH_CHANNEL_CLOSED:
1715 case SSH_CHANNEL_AUTH_SOCKET:
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001716 case SSH_CHANNEL_DYNAMIC:
Ben Lindstrom69128662001-05-08 20:07:39 +00001717 case SSH_CHANNEL_CONNECTING:
Damien Miller95def091999-11-25 00:26:21 +11001718 continue;
Damien Miller33b13562000-04-04 14:38:59 +10001719 case SSH_CHANNEL_LARVAL:
1720 if (!compat20)
1721 fatal("cannot happen: SSH_CHANNEL_LARVAL");
1722 continue;
Damien Miller95def091999-11-25 00:26:21 +11001723 case SSH_CHANNEL_OPENING:
1724 case SSH_CHANNEL_OPEN:
1725 case SSH_CHANNEL_X11_OPEN:
1726 return 1;
1727 case SSH_CHANNEL_INPUT_DRAINING:
1728 case SSH_CHANNEL_OUTPUT_DRAINING:
1729 if (!compat13)
1730 fatal("cannot happen: OUT_DRAIN");
1731 return 1;
1732 default:
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001733 fatal("channel_still_open: bad channel type %d", c->type);
Damien Miller95def091999-11-25 00:26:21 +11001734 /* NOTREACHED */
1735 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001736 }
Damien Miller95def091999-11-25 00:26:21 +11001737 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001738}
1739
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001740/* Returns the id of an open channel suitable for keepaliving */
1741
1742int
1743channel_find_open()
1744{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001745 int i;
1746 Channel *c;
1747
1748 for (i = 0; i < channels_alloc; i++) {
1749 c = channels[i];
1750 if (c == NULL)
1751 continue;
1752 switch (c->type) {
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001753 case SSH_CHANNEL_CLOSED:
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001754 case SSH_CHANNEL_DYNAMIC:
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001755 case SSH_CHANNEL_X11_LISTENER:
1756 case SSH_CHANNEL_PORT_LISTENER:
1757 case SSH_CHANNEL_RPORT_LISTENER:
1758 case SSH_CHANNEL_OPENING:
Ben Lindstrom69128662001-05-08 20:07:39 +00001759 case SSH_CHANNEL_CONNECTING:
Ben Lindstromd334b272001-04-14 23:08:36 +00001760 continue;
1761 case SSH_CHANNEL_LARVAL:
1762 case SSH_CHANNEL_AUTH_SOCKET:
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001763 case SSH_CHANNEL_OPEN:
1764 case SSH_CHANNEL_X11_OPEN:
1765 return i;
1766 case SSH_CHANNEL_INPUT_DRAINING:
1767 case SSH_CHANNEL_OUTPUT_DRAINING:
1768 if (!compat13)
1769 fatal("cannot happen: OUT_DRAIN");
1770 return i;
1771 default:
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001772 fatal("channel_find_open: bad channel type %d", c->type);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001773 /* NOTREACHED */
1774 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001775 }
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001776 return -1;
1777}
1778
1779
Damien Miller5428f641999-11-25 11:54:57 +11001780/*
1781 * Returns a message describing the currently open forwarded connections,
1782 * suitable for sending to the client. The message contains crlf pairs for
1783 * newlines.
1784 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001785
Damien Miller95def091999-11-25 00:26:21 +11001786char *
1787channel_open_message()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001788{
Damien Miller95def091999-11-25 00:26:21 +11001789 Buffer buffer;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001790 Channel *c;
1791 char buf[1024], *cp;
Damien Miller95def091999-11-25 00:26:21 +11001792 int i;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001793
Damien Miller95def091999-11-25 00:26:21 +11001794 buffer_init(&buffer);
1795 snprintf(buf, sizeof buf, "The following connections are open:\r\n");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001796 buffer_append(&buffer, buf, strlen(buf));
Damien Miller95def091999-11-25 00:26:21 +11001797 for (i = 0; i < channels_alloc; i++) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001798 c = channels[i];
1799 if (c == NULL)
1800 continue;
Damien Miller95def091999-11-25 00:26:21 +11001801 switch (c->type) {
Damien Miller95def091999-11-25 00:26:21 +11001802 case SSH_CHANNEL_X11_LISTENER:
1803 case SSH_CHANNEL_PORT_LISTENER:
Damien Miller0bc1bd82000-11-13 22:57:25 +11001804 case SSH_CHANNEL_RPORT_LISTENER:
Damien Miller95def091999-11-25 00:26:21 +11001805 case SSH_CHANNEL_CLOSED:
1806 case SSH_CHANNEL_AUTH_SOCKET:
1807 continue;
Damien Miller33b13562000-04-04 14:38:59 +10001808 case SSH_CHANNEL_LARVAL:
Damien Miller95def091999-11-25 00:26:21 +11001809 case SSH_CHANNEL_OPENING:
Ben Lindstrom7ad97102000-12-06 01:42:49 +00001810 case SSH_CHANNEL_CONNECTING:
Ben Lindstrom3bb4f9d2001-04-08 18:30:26 +00001811 case SSH_CHANNEL_DYNAMIC:
Damien Miller95def091999-11-25 00:26:21 +11001812 case SSH_CHANNEL_OPEN:
1813 case SSH_CHANNEL_X11_OPEN:
1814 case SSH_CHANNEL_INPUT_DRAINING:
1815 case SSH_CHANNEL_OUTPUT_DRAINING:
Damien Millerb38eff82000-04-01 11:09:21 +10001816 snprintf(buf, sizeof buf, " #%d %.300s (t%d r%d i%d/%d o%d/%d fd %d/%d)\r\n",
Damien Miller34132e52000-01-14 15:45:46 +11001817 c->self, c->remote_name,
1818 c->type, c->remote_id,
1819 c->istate, buffer_len(&c->input),
Damien Millerb38eff82000-04-01 11:09:21 +10001820 c->ostate, buffer_len(&c->output),
1821 c->rfd, c->wfd);
Damien Miller95def091999-11-25 00:26:21 +11001822 buffer_append(&buffer, buf, strlen(buf));
1823 continue;
1824 default:
Damien Millerb38eff82000-04-01 11:09:21 +10001825 fatal("channel_open_message: bad channel type %d", c->type);
Damien Miller95def091999-11-25 00:26:21 +11001826 /* NOTREACHED */
1827 }
1828 }
1829 buffer_append(&buffer, "\0", 1);
1830 cp = xstrdup(buffer_ptr(&buffer));
1831 buffer_free(&buffer);
1832 return cp;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001833}
1834
Damien Miller5428f641999-11-25 11:54:57 +11001835/*
1836 * Initiate forwarding of connections to local port "port" through the secure
1837 * channel to host:port from remote side.
1838 */
Kevin Steves12057502001-02-05 14:54:34 +00001839int
Damien Miller0bc1bd82000-11-13 22:57:25 +11001840channel_request_local_forwarding(u_short listen_port, const char *host_to_connect,
1841 u_short port_to_connect, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001842{
Kevin Steves12057502001-02-05 14:54:34 +00001843 return channel_request_forwarding(
Damien Miller0bc1bd82000-11-13 22:57:25 +11001844 NULL, listen_port,
1845 host_to_connect, port_to_connect,
1846 gateway_ports, /*remote_fwd*/ 0);
1847}
1848
1849/*
1850 * If 'remote_fwd' is true we have a '-R style' listener for protocol 2
1851 * (SSH_CHANNEL_RPORT_LISTENER).
1852 */
Kevin Steves12057502001-02-05 14:54:34 +00001853int
Damien Miller0bc1bd82000-11-13 22:57:25 +11001854channel_request_forwarding(
1855 const char *listen_address, u_short listen_port,
1856 const char *host_to_connect, u_short port_to_connect,
1857 int gateway_ports, int remote_fwd)
1858{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001859 Channel *c;
1860 int success, sock, on = 1, ctype;
Damien Miller34132e52000-01-14 15:45:46 +11001861 struct addrinfo hints, *ai, *aitop;
1862 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
Damien Miller0bc1bd82000-11-13 22:57:25 +11001863 const char *host;
Damien Miller5428f641999-11-25 11:54:57 +11001864 struct linger linger;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001865
Kevin Steves12057502001-02-05 14:54:34 +00001866 success = 0;
1867
Damien Miller0bc1bd82000-11-13 22:57:25 +11001868 if (remote_fwd) {
1869 host = listen_address;
Kevin Stevesef4eea92001-02-05 12:42:17 +00001870 ctype = SSH_CHANNEL_RPORT_LISTENER;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001871 } else {
1872 host = host_to_connect;
1873 ctype =SSH_CHANNEL_PORT_LISTENER;
1874 }
1875
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001876 if (strlen(host) > SSH_CHANNEL_PATH_LEN - 1) {
Kevin Steves12057502001-02-05 14:54:34 +00001877 error("Forward host name too long.");
1878 return success;
1879 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001880
Damien Miller0bc1bd82000-11-13 22:57:25 +11001881 /* XXX listen_address is currently ignored */
Damien Miller5428f641999-11-25 11:54:57 +11001882 /*
Damien Miller34132e52000-01-14 15:45:46 +11001883 * getaddrinfo returns a loopback address if the hostname is
1884 * set to NULL and hints.ai_flags is not AI_PASSIVE
Damien Miller5428f641999-11-25 11:54:57 +11001885 */
Damien Miller34132e52000-01-14 15:45:46 +11001886 memset(&hints, 0, sizeof(hints));
1887 hints.ai_family = IPv4or6;
1888 hints.ai_flags = gateway_ports ? AI_PASSIVE : 0;
1889 hints.ai_socktype = SOCK_STREAM;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001890 snprintf(strport, sizeof strport, "%d", listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11001891 if (getaddrinfo(NULL, strport, &hints, &aitop) != 0)
1892 packet_disconnect("getaddrinfo: fatal error");
Damien Miller5428f641999-11-25 11:54:57 +11001893
Damien Miller34132e52000-01-14 15:45:46 +11001894 for (ai = aitop; ai; ai = ai->ai_next) {
1895 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
1896 continue;
1897 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
1898 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001899 error("channel_request_forwarding: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11001900 continue;
1901 }
1902 /* Create a port to listen for the host. */
1903 sock = socket(ai->ai_family, SOCK_STREAM, 0);
1904 if (sock < 0) {
1905 /* this is no error since kernel may not support ipv6 */
1906 verbose("socket: %.100s", strerror(errno));
1907 continue;
1908 }
1909 /*
1910 * Set socket options. We would like the socket to disappear
1911 * as soon as it has been closed for whatever reason.
1912 */
1913 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
1914 linger.l_onoff = 1;
1915 linger.l_linger = 5;
1916 setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger));
1917 debug("Local forwarding listening on %s port %s.", ntop, strport);
Damien Miller95def091999-11-25 00:26:21 +11001918
Damien Miller34132e52000-01-14 15:45:46 +11001919 /* Bind the socket to the address. */
1920 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
1921 /* address can be in use ipv6 address is already bound */
Damien Miller3c7eeb22000-03-03 22:35:33 +11001922 if (!ai->ai_next)
1923 error("bind: %.100s", strerror(errno));
1924 else
1925 verbose("bind: %.100s", strerror(errno));
Kevin Stevesef4eea92001-02-05 12:42:17 +00001926
Damien Miller34132e52000-01-14 15:45:46 +11001927 close(sock);
1928 continue;
1929 }
1930 /* Start listening for connections on the socket. */
1931 if (listen(sock, 5) < 0) {
1932 error("listen: %.100s", strerror(errno));
1933 close(sock);
1934 continue;
1935 }
1936 /* Allocate a channel number for the socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001937 c = channel_new("port listener", ctype, sock, sock, -1,
Damien Millerbd483e72000-04-30 10:00:53 +10001938 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11001939 0, xstrdup("port listener"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001940 if (c == NULL) {
1941 error("channel_request_forwarding: channel_new failed");
1942 close(sock);
1943 continue;
1944 }
1945 strlcpy(c->path, host, sizeof(c->path));
1946 c->host_port = port_to_connect;
1947 c->listening_port = listen_port;
Damien Miller34132e52000-01-14 15:45:46 +11001948 success = 1;
1949 }
1950 if (success == 0)
Kevin Steves12057502001-02-05 14:54:34 +00001951 error("channel_request_forwarding: cannot listen to port: %d",
1952 listen_port);
Damien Miller34132e52000-01-14 15:45:46 +11001953 freeaddrinfo(aitop);
Kevin Steves12057502001-02-05 14:54:34 +00001954 return success;
Damien Miller95def091999-11-25 00:26:21 +11001955}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001956
Damien Miller5428f641999-11-25 11:54:57 +11001957/*
1958 * Initiate forwarding of connections to port "port" on remote host through
1959 * the secure channel to host:port from local side.
1960 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001961
Damien Miller4af51302000-04-16 11:18:38 +10001962void
Damien Miller0bc1bd82000-11-13 22:57:25 +11001963channel_request_remote_forwarding(u_short listen_port,
1964 const char *host_to_connect, u_short port_to_connect)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001965{
Damien Miller0bc1bd82000-11-13 22:57:25 +11001966 int payload_len, type, success = 0;
1967
Damien Miller95def091999-11-25 00:26:21 +11001968 /* Record locally that connection to this host/port is permitted. */
1969 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
1970 fatal("channel_request_remote_forwarding: too many forwards");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001971
Damien Miller95def091999-11-25 00:26:21 +11001972 /* Send the forward request to the remote side. */
Damien Miller33b13562000-04-04 14:38:59 +10001973 if (compat20) {
1974 const char *address_to_bind = "0.0.0.0";
1975 packet_start(SSH2_MSG_GLOBAL_REQUEST);
1976 packet_put_cstring("tcpip-forward");
1977 packet_put_char(0); /* boolean: want reply */
1978 packet_put_cstring(address_to_bind);
1979 packet_put_int(listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001980 packet_send();
1981 packet_write_wait();
1982 /* Assume that server accepts the request */
1983 success = 1;
Damien Miller33b13562000-04-04 14:38:59 +10001984 } else {
1985 packet_start(SSH_CMSG_PORT_FORWARD_REQUEST);
Damien Miller33b13562000-04-04 14:38:59 +10001986 packet_put_int(listen_port);
Damien Miller8bb73be2000-04-19 16:26:12 +10001987 packet_put_cstring(host_to_connect);
1988 packet_put_int(port_to_connect);
Damien Miller33b13562000-04-04 14:38:59 +10001989 packet_send();
1990 packet_write_wait();
Damien Miller0bc1bd82000-11-13 22:57:25 +11001991
1992 /* Wait for response from the remote side. */
1993 type = packet_read(&payload_len);
1994 switch (type) {
1995 case SSH_SMSG_SUCCESS:
1996 success = 1;
1997 break;
1998 case SSH_SMSG_FAILURE:
1999 log("Warning: Server denied remote port forwarding.");
2000 break;
2001 default:
2002 /* Unknown packet */
2003 packet_disconnect("Protocol error for port forward request:"
2004 "received packet type %d.", type);
2005 }
2006 }
2007 if (success) {
2008 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host_to_connect);
2009 permitted_opens[num_permitted_opens].port_to_connect = port_to_connect;
2010 permitted_opens[num_permitted_opens].listen_port = listen_port;
2011 num_permitted_opens++;
Damien Miller33b13562000-04-04 14:38:59 +10002012 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002013}
2014
Damien Miller5428f641999-11-25 11:54:57 +11002015/*
2016 * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates
2017 * listening for the port, and sends back a success reply (or disconnect
2018 * message if there was an error). This never returns if there was an error.
2019 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002020
Damien Miller4af51302000-04-16 11:18:38 +10002021void
Damien Millere247cc42000-05-07 12:03:14 +10002022channel_input_port_forward_request(int is_root, int gateway_ports)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002023{
Damien Milleraae6c611999-12-06 11:47:28 +11002024 u_short port, host_port;
Damien Miller95def091999-11-25 00:26:21 +11002025 char *hostname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002026
Damien Miller95def091999-11-25 00:26:21 +11002027 /* Get arguments from the packet. */
2028 port = packet_get_int();
2029 hostname = packet_get_string(NULL);
2030 host_port = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002031
Damien Millerbac2d8a2000-09-05 16:13:06 +11002032#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +11002033 /*
2034 * Check that an unprivileged user is not trying to forward a
2035 * privileged port.
2036 */
Damien Miller95def091999-11-25 00:26:21 +11002037 if (port < IPPORT_RESERVED && !is_root)
2038 packet_disconnect("Requested forwarding of port %d but user is not root.",
2039 port);
Damien Millerbac2d8a2000-09-05 16:13:06 +11002040#endif
Damien Miller0bc1bd82000-11-13 22:57:25 +11002041 /* Initiate forwarding */
Damien Millere247cc42000-05-07 12:03:14 +10002042 channel_request_local_forwarding(port, hostname, host_port, gateway_ports);
Damien Miller95def091999-11-25 00:26:21 +11002043
2044 /* Free the argument string. */
2045 xfree(hostname);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002046}
2047
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002048/*
2049 * Permits opening to any host/port if permitted_opens[] is empty. This is
2050 * usually called by the server, because the user could connect to any port
2051 * anyway, and the server has no way to know but to trust the client anyway.
2052 */
2053void
2054channel_permit_all_opens()
2055{
2056 if (num_permitted_opens == 0)
2057 all_opens_permitted = 1;
2058}
2059
Ben Lindstroma3700052001-04-05 23:26:32 +00002060void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002061channel_add_permitted_opens(char *host, int port)
2062{
2063 if (num_permitted_opens >= SSH_MAX_FORWARDS_PER_DIRECTION)
2064 fatal("channel_request_remote_forwarding: too many forwards");
2065 debug("allow port forwarding to host %s port %d", host, port);
2066
2067 permitted_opens[num_permitted_opens].host_to_connect = xstrdup(host);
2068 permitted_opens[num_permitted_opens].port_to_connect = port;
2069 num_permitted_opens++;
2070
2071 all_opens_permitted = 0;
2072}
2073
Ben Lindstroma3700052001-04-05 23:26:32 +00002074void
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002075channel_clear_permitted_opens(void)
2076{
2077 int i;
2078
2079 for (i = 0; i < num_permitted_opens; i++)
2080 xfree(permitted_opens[i].host_to_connect);
2081 num_permitted_opens = 0;
2082
2083}
2084
2085
2086/* return socket to remote host, port */
Damien Millerb38eff82000-04-01 11:09:21 +10002087int
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002088connect_to(const char *host, u_short port)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002089{
Damien Miller34132e52000-01-14 15:45:46 +11002090 struct addrinfo hints, *ai, *aitop;
2091 char ntop[NI_MAXHOST], strport[NI_MAXSERV];
2092 int gaierr;
Damien Millerb38eff82000-04-01 11:09:21 +10002093 int sock = -1;
Damien Miller95def091999-11-25 00:26:21 +11002094
Damien Miller34132e52000-01-14 15:45:46 +11002095 memset(&hints, 0, sizeof(hints));
2096 hints.ai_family = IPv4or6;
2097 hints.ai_socktype = SOCK_STREAM;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002098 snprintf(strport, sizeof strport, "%d", port);
Damien Miller34132e52000-01-14 15:45:46 +11002099 if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002100 error("connect_to %.100s: unknown host (%s)", host,
2101 gai_strerror(gaierr));
Damien Millerb38eff82000-04-01 11:09:21 +10002102 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002103 }
Damien Miller34132e52000-01-14 15:45:46 +11002104 for (ai = aitop; ai; ai = ai->ai_next) {
2105 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2106 continue;
2107 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop, sizeof(ntop),
2108 strport, sizeof(strport), NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002109 error("connect_to: getnameinfo failed");
Damien Miller34132e52000-01-14 15:45:46 +11002110 continue;
2111 }
Damien Miller34132e52000-01-14 15:45:46 +11002112 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2113 if (sock < 0) {
2114 error("socket: %.100s", strerror(errno));
2115 continue;
2116 }
Ben Lindstrom48bd7c12001-01-09 00:35:42 +00002117 if (fcntl(sock, F_SETFL, O_NONBLOCK) < 0)
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002118 fatal("connect_to: F_SETFL: %s", strerror(errno));
Ben Lindstrom7ad97102000-12-06 01:42:49 +00002119 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
2120 errno != EINPROGRESS) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002121 error("connect_to %.100s port %s: %.100s", ntop, strport,
Damien Miller34132e52000-01-14 15:45:46 +11002122 strerror(errno));
2123 close(sock);
Kevin Stevesef4eea92001-02-05 12:42:17 +00002124 continue; /* fail -- try next */
Damien Miller34132e52000-01-14 15:45:46 +11002125 }
2126 break; /* success */
2127
2128 }
2129 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002130 if (!ai) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002131 error("connect_to %.100s port %d: failed.", host, port);
Damien Millerb38eff82000-04-01 11:09:21 +10002132 return -1;
2133 }
2134 /* success */
2135 return sock;
2136}
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002137
Damien Miller0bc1bd82000-11-13 22:57:25 +11002138int
2139channel_connect_by_listen_adress(u_short listen_port)
2140{
2141 int i;
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002142
Damien Miller0bc1bd82000-11-13 22:57:25 +11002143 for (i = 0; i < num_permitted_opens; i++)
2144 if (permitted_opens[i].listen_port == listen_port)
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002145 return connect_to(
Damien Miller0bc1bd82000-11-13 22:57:25 +11002146 permitted_opens[i].host_to_connect,
2147 permitted_opens[i].port_to_connect);
Ben Lindstromc72745a2000-12-02 19:03:54 +00002148 error("WARNING: Server requests forwarding for unknown listen_port %d",
2149 listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11002150 return -1;
2151}
Damien Millerb38eff82000-04-01 11:09:21 +10002152
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002153/* Check if connecting to that port is permitted and connect. */
2154int
2155channel_connect_to(const char *host, u_short port)
2156{
2157 int i, permit;
2158
2159 permit = all_opens_permitted;
2160 if (!permit) {
2161 for (i = 0; i < num_permitted_opens; i++)
2162 if (permitted_opens[i].port_to_connect == port &&
2163 strcmp(permitted_opens[i].host_to_connect, host) == 0)
2164 permit = 1;
2165
2166 }
2167 if (!permit) {
2168 log("Received request to connect to host %.100s port %d, "
2169 "but the request was denied.", host, port);
2170 return -1;
2171 }
2172 return connect_to(host, port);
2173}
2174
Damien Millerb38eff82000-04-01 11:09:21 +10002175/*
2176 * This is called after receiving PORT_OPEN message. This attempts to
2177 * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION
2178 * or CHANNEL_OPEN_FAILURE.
2179 */
2180
Damien Miller4af51302000-04-16 11:18:38 +10002181void
Damien Miller62cee002000-09-23 17:15:56 +11002182channel_input_port_open(int type, int plen, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +10002183{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002184 Channel *c = NULL;
Damien Millerb38eff82000-04-01 11:09:21 +10002185 u_short host_port;
2186 char *host, *originator_string;
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002187 int remote_id, sock = -1;
Damien Millerb38eff82000-04-01 11:09:21 +10002188
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002189 remote_id = packet_get_int();
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002190 host = packet_get_string(NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10002191 host_port = packet_get_int();
2192
Damien Millerb38eff82000-04-01 11:09:21 +10002193 if (have_hostname_in_open) {
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002194 originator_string = packet_get_string(NULL);
Damien Millerb38eff82000-04-01 11:09:21 +10002195 } else {
2196 originator_string = xstrdup("unknown (remote did not supply name)");
Damien Miller95def091999-11-25 00:26:21 +11002197 }
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00002198 packet_done();
2199 sock = channel_connect_to(host, host_port);
2200 if (sock != -1) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002201 c = channel_new("connected socket",
2202 SSH_CHANNEL_CONNECTING, sock, sock, -1, 0, 0, 0,
2203 originator_string, 1);
2204 if (c == NULL) {
2205 error("channel_input_port_open: channel_new failed");
2206 close(sock);
2207 } else {
2208 c->remote_id = remote_id;
2209 }
2210 }
2211 if (c == NULL) {
2212 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2213 packet_put_int(remote_id);
Ben Lindstrom69128662001-05-08 20:07:39 +00002214 packet_send();
Damien Millerb38eff82000-04-01 11:09:21 +10002215 }
Damien Miller95def091999-11-25 00:26:21 +11002216 xfree(host);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002217}
2218
Damien Miller5428f641999-11-25 11:54:57 +11002219/*
2220 * Creates an internet domain socket for listening for X11 connections.
2221 * Returns a suitable value for the DISPLAY variable, or NULL if an error
2222 * occurs.
2223 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002224
Damien Miller34132e52000-01-14 15:45:46 +11002225#define NUM_SOCKS 10
2226
Damien Miller95def091999-11-25 00:26:21 +11002227char *
Damien Millera34a28b1999-12-14 10:47:15 +11002228x11_create_display_inet(int screen_number, int x11_display_offset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002229{
Damien Milleraae6c611999-12-06 11:47:28 +11002230 int display_number, sock;
2231 u_short port;
Damien Miller34132e52000-01-14 15:45:46 +11002232 struct addrinfo hints, *ai, *aitop;
2233 char strport[NI_MAXSERV];
2234 int gaierr, n, num_socks = 0, socks[NUM_SOCKS];
2235 char display[512];
Damien Miller95def091999-11-25 00:26:21 +11002236 char hostname[MAXHOSTNAMELEN];
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002237
Damien Millera34a28b1999-12-14 10:47:15 +11002238 for (display_number = x11_display_offset;
Damien Miller95def091999-11-25 00:26:21 +11002239 display_number < MAX_DISPLAYS;
2240 display_number++) {
2241 port = 6000 + display_number;
Damien Miller34132e52000-01-14 15:45:46 +11002242 memset(&hints, 0, sizeof(hints));
2243 hints.ai_family = IPv4or6;
2244 hints.ai_flags = AI_PASSIVE; /* XXX loopback only ? */
2245 hints.ai_socktype = SOCK_STREAM;
2246 snprintf(strport, sizeof strport, "%d", port);
2247 if ((gaierr = getaddrinfo(NULL, strport, &hints, &aitop)) != 0) {
2248 error("getaddrinfo: %.100s", gai_strerror(gaierr));
Damien Miller95def091999-11-25 00:26:21 +11002249 return NULL;
2250 }
Damien Miller34132e52000-01-14 15:45:46 +11002251 for (ai = aitop; ai; ai = ai->ai_next) {
2252 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
2253 continue;
2254 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2255 if (sock < 0) {
Damien Miller89d97962000-10-14 12:37:19 +11002256 if ((errno != EINVAL) && (errno != EAFNOSUPPORT)) {
Damien Millere2192732000-01-17 13:22:55 +11002257 error("socket: %.100s", strerror(errno));
2258 return NULL;
2259 } else {
Damien Millercb5e44a2000-09-29 12:12:36 +11002260 debug("x11_create_display_inet: Socket family %d not supported",
2261 ai->ai_family);
Damien Millere2192732000-01-17 13:22:55 +11002262 continue;
2263 }
Damien Miller34132e52000-01-14 15:45:46 +11002264 }
2265 if (bind(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2266 debug("bind port %d: %.100s", port, strerror(errno));
2267 shutdown(sock, SHUT_RDWR);
2268 close(sock);
Damien Miller3c7eeb22000-03-03 22:35:33 +11002269
2270 if (ai->ai_next)
2271 continue;
2272
Damien Miller34132e52000-01-14 15:45:46 +11002273 for (n = 0; n < num_socks; n++) {
2274 shutdown(socks[n], SHUT_RDWR);
2275 close(socks[n]);
2276 }
2277 num_socks = 0;
2278 break;
2279 }
2280 socks[num_socks++] = sock;
Damien Miller7bcb0892000-03-11 20:45:40 +11002281#ifndef DONT_TRY_OTHER_AF
Damien Miller34132e52000-01-14 15:45:46 +11002282 if (num_socks == NUM_SOCKS)
2283 break;
Damien Miller7bcb0892000-03-11 20:45:40 +11002284#else
2285 break;
2286#endif
Damien Miller95def091999-11-25 00:26:21 +11002287 }
Ben Lindstrom87b147f2001-01-25 00:41:12 +00002288 freeaddrinfo(aitop);
Damien Miller34132e52000-01-14 15:45:46 +11002289 if (num_socks > 0)
2290 break;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002291 }
Damien Miller95def091999-11-25 00:26:21 +11002292 if (display_number >= MAX_DISPLAYS) {
2293 error("Failed to allocate internet-domain X11 display socket.");
2294 return NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002295 }
Damien Miller95def091999-11-25 00:26:21 +11002296 /* Start listening for connections on the socket. */
Damien Miller34132e52000-01-14 15:45:46 +11002297 for (n = 0; n < num_socks; n++) {
2298 sock = socks[n];
2299 if (listen(sock, 5) < 0) {
2300 error("listen: %.100s", strerror(errno));
2301 shutdown(sock, SHUT_RDWR);
2302 close(sock);
2303 return NULL;
2304 }
Damien Miller95def091999-11-25 00:26:21 +11002305 }
Damien Miller34132e52000-01-14 15:45:46 +11002306
Damien Miller95def091999-11-25 00:26:21 +11002307 /* Set up a suitable value for the DISPLAY variable. */
2308 if (gethostname(hostname, sizeof(hostname)) < 0)
2309 fatal("gethostname: %.100s", strerror(errno));
Damien Miller76112de1999-12-21 11:18:08 +11002310
2311#ifdef IPADDR_IN_DISPLAY
Kevin Stevesef4eea92001-02-05 12:42:17 +00002312 /*
Damien Miller76112de1999-12-21 11:18:08 +11002313 * HPUX detects the local hostname in the DISPLAY variable and tries
2314 * to set up a shared memory connection to the server, which it
2315 * incorrectly supposes to be local.
2316 *
2317 * The workaround - as used in later $$H and other programs - is
2318 * is to set display to the host's IP address.
2319 */
2320 {
2321 struct hostent *he;
2322 struct in_addr my_addr;
2323
2324 he = gethostbyname(hostname);
2325 if (he == NULL) {
2326 error("[X11-broken-fwd-hostname-workaround] Could not get "
2327 "IP address for hostname %s.", hostname);
2328
2329 packet_send_debug("[X11-broken-fwd-hostname-workaround]"
2330 "Could not get IP address for hostname %s.", hostname);
2331
2332 shutdown(sock, SHUT_RDWR);
2333 close(sock);
2334
2335 return NULL;
2336 }
2337
2338 memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
2339
2340 /* Set DISPLAY to <ip address>:screen.display */
Kevin Stevesef4eea92001-02-05 12:42:17 +00002341 snprintf(display, sizeof(display), "%.50s:%d.%d", inet_ntoa(my_addr),
Kevin Stevesda6cd592000-12-29 18:41:21 +00002342 display_number, screen_number);
Damien Miller76112de1999-12-21 11:18:08 +11002343 }
2344#else /* IPADDR_IN_DISPLAY */
2345 /* Just set DISPLAY to hostname:screen.display */
Damien Miller34132e52000-01-14 15:45:46 +11002346 snprintf(display, sizeof display, "%.400s:%d.%d", hostname,
Kevin Stevesda6cd592000-12-29 18:41:21 +00002347 display_number, screen_number);
Damien Miller76112de1999-12-21 11:18:08 +11002348#endif /* IPADDR_IN_DISPLAY */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002349
Damien Miller34132e52000-01-14 15:45:46 +11002350 /* Allocate a channel for each socket. */
2351 for (n = 0; n < num_socks; n++) {
2352 sock = socks[n];
Damien Millerbd483e72000-04-30 10:00:53 +10002353 (void) channel_new("x11 listener",
2354 SSH_CHANNEL_X11_LISTENER, sock, sock, -1,
2355 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
Damien Miller69b69aa2000-10-28 14:19:58 +11002356 0, xstrdup("X11 inet listener"), 1);
Damien Miller34132e52000-01-14 15:45:46 +11002357 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002358
Damien Miller95def091999-11-25 00:26:21 +11002359 /* Return a suitable value for the DISPLAY environment variable. */
Damien Miller34132e52000-01-14 15:45:46 +11002360 return xstrdup(display);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002361}
2362
2363#ifndef X_UNIX_PATH
2364#define X_UNIX_PATH "/tmp/.X11-unix/X"
2365#endif
2366
2367static
2368int
Ben Lindstrom46c16222000-12-22 01:43:59 +00002369connect_local_xsocket(u_int dnr)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002370{
Damien Miller95def091999-11-25 00:26:21 +11002371 static const char *const x_sockets[] = {
2372 X_UNIX_PATH "%u",
2373 "/var/X/.X11-unix/X" "%u",
2374 "/usr/spool/sockets/X11/" "%u",
2375 NULL
2376 };
2377 int sock;
2378 struct sockaddr_un addr;
2379 const char *const * path;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002380
Damien Miller95def091999-11-25 00:26:21 +11002381 for (path = x_sockets; *path; ++path) {
2382 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2383 if (sock < 0)
2384 error("socket: %.100s", strerror(errno));
2385 memset(&addr, 0, sizeof(addr));
2386 addr.sun_family = AF_UNIX;
2387 snprintf(addr.sun_path, sizeof addr.sun_path, *path, dnr);
2388 if (connect(sock, (struct sockaddr *) & addr, sizeof(addr)) == 0)
2389 return sock;
2390 close(sock);
2391 }
2392 error("connect %.100s: %.100s", addr.sun_path, strerror(errno));
2393 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002394}
2395
Damien Millerbd483e72000-04-30 10:00:53 +10002396int
2397x11_connect_display(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002398{
Damien Millerbd483e72000-04-30 10:00:53 +10002399 int display_number, sock = 0;
Damien Miller95def091999-11-25 00:26:21 +11002400 const char *display;
Damien Millerbd483e72000-04-30 10:00:53 +10002401 char buf[1024], *cp;
Damien Miller34132e52000-01-14 15:45:46 +11002402 struct addrinfo hints, *ai, *aitop;
2403 char strport[NI_MAXSERV];
2404 int gaierr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002405
Damien Miller95def091999-11-25 00:26:21 +11002406 /* Try to open a socket for the local X server. */
2407 display = getenv("DISPLAY");
2408 if (!display) {
2409 error("DISPLAY not set.");
Damien Millerbd483e72000-04-30 10:00:53 +10002410 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002411 }
Damien Miller5428f641999-11-25 11:54:57 +11002412 /*
2413 * Now we decode the value of the DISPLAY variable and make a
2414 * connection to the real X server.
2415 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002416
Damien Miller5428f641999-11-25 11:54:57 +11002417 /*
2418 * Check if it is a unix domain socket. Unix domain displays are in
2419 * one of the following formats: unix:d[.s], :d[.s], ::d[.s]
2420 */
Damien Miller95def091999-11-25 00:26:21 +11002421 if (strncmp(display, "unix:", 5) == 0 ||
2422 display[0] == ':') {
2423 /* Connect to the unix domain socket. */
2424 if (sscanf(strrchr(display, ':') + 1, "%d", &display_number) != 1) {
2425 error("Could not parse display number from DISPLAY: %.100s",
2426 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002427 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002428 }
2429 /* Create a socket. */
2430 sock = connect_local_xsocket(display_number);
2431 if (sock < 0)
Damien Millerbd483e72000-04-30 10:00:53 +10002432 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002433
2434 /* OK, we now have a connection to the display. */
Damien Millerbd483e72000-04-30 10:00:53 +10002435 return sock;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002436 }
Damien Miller5428f641999-11-25 11:54:57 +11002437 /*
2438 * Connect to an inet socket. The DISPLAY value is supposedly
2439 * hostname:d[.s], where hostname may also be numeric IP address.
2440 */
Damien Miller95def091999-11-25 00:26:21 +11002441 strncpy(buf, display, sizeof(buf));
2442 buf[sizeof(buf) - 1] = 0;
2443 cp = strchr(buf, ':');
2444 if (!cp) {
2445 error("Could not find ':' in DISPLAY: %.100s", display);
Damien Millerbd483e72000-04-30 10:00:53 +10002446 return -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002447 }
Damien Miller95def091999-11-25 00:26:21 +11002448 *cp = 0;
Damien Miller5428f641999-11-25 11:54:57 +11002449 /* buf now contains the host name. But first we parse the display number. */
Damien Miller95def091999-11-25 00:26:21 +11002450 if (sscanf(cp + 1, "%d", &display_number) != 1) {
2451 error("Could not parse display number from DISPLAY: %.100s",
2452 display);
Damien Millerbd483e72000-04-30 10:00:53 +10002453 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002454 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002455
Damien Miller34132e52000-01-14 15:45:46 +11002456 /* Look up the host address */
2457 memset(&hints, 0, sizeof(hints));
2458 hints.ai_family = IPv4or6;
2459 hints.ai_socktype = SOCK_STREAM;
2460 snprintf(strport, sizeof strport, "%d", 6000 + display_number);
2461 if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
2462 error("%.100s: unknown host. (%s)", buf, gai_strerror(gaierr));
Damien Millerbd483e72000-04-30 10:00:53 +10002463 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002464 }
Damien Miller34132e52000-01-14 15:45:46 +11002465 for (ai = aitop; ai; ai = ai->ai_next) {
2466 /* Create a socket. */
2467 sock = socket(ai->ai_family, SOCK_STREAM, 0);
2468 if (sock < 0) {
2469 debug("socket: %.100s", strerror(errno));
Damien Millerb38eff82000-04-01 11:09:21 +10002470 continue;
2471 }
2472 /* Connect it to the display. */
2473 if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0) {
2474 debug("connect %.100s port %d: %.100s", buf,
2475 6000 + display_number, strerror(errno));
2476 close(sock);
2477 continue;
2478 }
2479 /* Success */
2480 break;
Damien Miller34132e52000-01-14 15:45:46 +11002481 }
Damien Miller34132e52000-01-14 15:45:46 +11002482 freeaddrinfo(aitop);
2483 if (!ai) {
Damien Miller4af51302000-04-16 11:18:38 +10002484 error("connect %.100s port %d: %.100s", buf, 6000 + display_number,
Damien Miller34132e52000-01-14 15:45:46 +11002485 strerror(errno));
Damien Millerbd483e72000-04-30 10:00:53 +10002486 return -1;
Damien Miller95def091999-11-25 00:26:21 +11002487 }
Damien Millerbd483e72000-04-30 10:00:53 +10002488 return sock;
2489}
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002490
Damien Millerbd483e72000-04-30 10:00:53 +10002491/*
2492 * This is called when SSH_SMSG_X11_OPEN is received. The packet contains
2493 * the remote channel number. We should do whatever we want, and respond
2494 * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.
2495 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002496
Damien Millerbd483e72000-04-30 10:00:53 +10002497void
Damien Miller62cee002000-09-23 17:15:56 +11002498x11_input_open(int type, int plen, void *ctxt)
Damien Millerbd483e72000-04-30 10:00:53 +10002499{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002500 Channel *c = NULL;
2501 int remote_id, sock = 0;
Damien Millerbd483e72000-04-30 10:00:53 +10002502 char *remote_host;
Damien Millerbd483e72000-04-30 10:00:53 +10002503
2504 debug("Received X11 open request.");
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002505
2506 remote_id = packet_get_int();
2507 if (have_hostname_in_open) {
2508 remote_host = packet_get_string(NULL);
2509 } else {
2510 remote_host = xstrdup("unknown (remote did not supply name)");
2511 }
2512 packet_done();
Damien Millerbd483e72000-04-30 10:00:53 +10002513
2514 /* Obtain a connection to the real X display. */
2515 sock = x11_connect_display();
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002516 if (sock != -1) {
2517 /* Allocate a channel for this connection. */
2518 c = channel_new("connected x11 socket",
2519 SSH_CHANNEL_X11_OPEN, sock, sock, -1, 0, 0, 0,
2520 remote_host, 1);
2521 if (c == NULL) {
2522 error("x11_input_open: channel_new failed");
2523 close(sock);
2524 } else {
2525 c->remote_id = remote_id;
2526 }
2527 }
2528 if (c == NULL) {
Damien Millerbd483e72000-04-30 10:00:53 +10002529 /* Send refusal to the remote host. */
2530 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002531 packet_put_int(remote_id);
Damien Millerbd483e72000-04-30 10:00:53 +10002532 } else {
Damien Millerbd483e72000-04-30 10:00:53 +10002533 /* Send a confirmation to the remote host. */
2534 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002535 packet_put_int(remote_id);
2536 packet_put_int(c->self);
Damien Millerbd483e72000-04-30 10:00:53 +10002537 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002538 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002539}
2540
Damien Miller69b69aa2000-10-28 14:19:58 +11002541/* dummy protocol handler that denies SSH-1 requests (agent/x11) */
2542void
2543deny_input_open(int type, int plen, void *ctxt)
2544{
2545 int rchan = packet_get_int();
2546 switch(type){
2547 case SSH_SMSG_AGENT_OPEN:
2548 error("Warning: ssh server tried agent forwarding.");
2549 break;
2550 case SSH_SMSG_X11_OPEN:
2551 error("Warning: ssh server tried X11 forwarding.");
2552 break;
2553 default:
2554 error("deny_input_open: type %d plen %d", type, plen);
2555 break;
2556 }
2557 error("Warning: this is probably a break in attempt by a malicious server.");
2558 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2559 packet_put_int(rchan);
2560 packet_send();
2561}
2562
Damien Miller5428f641999-11-25 11:54:57 +11002563/*
2564 * Requests forwarding of X11 connections, generates fake authentication
2565 * data, and enables authentication spoofing.
2566 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002567
Damien Miller4af51302000-04-16 11:18:38 +10002568void
Damien Millerbd483e72000-04-30 10:00:53 +10002569x11_request_forwarding_with_spoofing(int client_session_id,
2570 const char *proto, const char *data)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002571{
Ben Lindstrom46c16222000-12-22 01:43:59 +00002572 u_int data_len = (u_int) strlen(data) / 2;
Ben Lindstromb3211a82001-02-10 22:33:19 +00002573 u_int i, value, len;
Damien Miller95def091999-11-25 00:26:21 +11002574 char *new_data;
2575 int screen_number;
2576 const char *cp;
2577 u_int32_t rand = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002578
Damien Miller95def091999-11-25 00:26:21 +11002579 cp = getenv("DISPLAY");
2580 if (cp)
2581 cp = strchr(cp, ':');
2582 if (cp)
2583 cp = strchr(cp, '.');
2584 if (cp)
2585 screen_number = atoi(cp + 1);
2586 else
2587 screen_number = 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002588
Damien Miller95def091999-11-25 00:26:21 +11002589 /* Save protocol name. */
2590 x11_saved_proto = xstrdup(proto);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002591
Damien Miller5428f641999-11-25 11:54:57 +11002592 /*
2593 * Extract real authentication data and generate fake data of the
2594 * same length.
2595 */
Damien Miller95def091999-11-25 00:26:21 +11002596 x11_saved_data = xmalloc(data_len);
2597 x11_fake_data = xmalloc(data_len);
2598 for (i = 0; i < data_len; i++) {
2599 if (sscanf(data + 2 * i, "%2x", &value) != 1)
2600 fatal("x11_request_forwarding: bad authentication data: %.100s", data);
2601 if (i % 4 == 0)
2602 rand = arc4random();
2603 x11_saved_data[i] = value;
2604 x11_fake_data[i] = rand & 0xff;
2605 rand >>= 8;
2606 }
2607 x11_saved_data_len = data_len;
2608 x11_fake_data_len = data_len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002609
Damien Miller95def091999-11-25 00:26:21 +11002610 /* Convert the fake data into hex. */
Ben Lindstromb3211a82001-02-10 22:33:19 +00002611 len = 2 * data_len + 1;
2612 new_data = xmalloc(len);
Damien Miller95def091999-11-25 00:26:21 +11002613 for (i = 0; i < data_len; i++)
Ben Lindstromb3211a82001-02-10 22:33:19 +00002614 snprintf(new_data + 2 * i, len - 2 * i,
2615 "%02x", (u_char) x11_fake_data[i]);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002616
Damien Miller95def091999-11-25 00:26:21 +11002617 /* Send the request packet. */
Damien Millerbd483e72000-04-30 10:00:53 +10002618 if (compat20) {
2619 channel_request_start(client_session_id, "x11-req", 0);
2620 packet_put_char(0); /* XXX bool single connection */
2621 } else {
2622 packet_start(SSH_CMSG_X11_REQUEST_FORWARDING);
2623 }
2624 packet_put_cstring(proto);
2625 packet_put_cstring(new_data);
Damien Miller95def091999-11-25 00:26:21 +11002626 packet_put_int(screen_number);
2627 packet_send();
2628 packet_write_wait();
2629 xfree(new_data);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002630}
2631
2632/* Sends a message to the server to request authentication fd forwarding. */
2633
Damien Miller4af51302000-04-16 11:18:38 +10002634void
Damien Miller95def091999-11-25 00:26:21 +11002635auth_request_forwarding()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002636{
Damien Miller95def091999-11-25 00:26:21 +11002637 packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
2638 packet_send();
2639 packet_write_wait();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002640}
2641
Damien Miller5428f641999-11-25 11:54:57 +11002642/*
2643 * Returns the name of the forwarded authentication socket. Returns NULL if
2644 * there is no forwarded authentication socket. The returned value points to
2645 * a static buffer.
2646 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002647
Damien Miller95def091999-11-25 00:26:21 +11002648char *
2649auth_get_socket_name()
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002650{
Damien Miller95def091999-11-25 00:26:21 +11002651 return channel_forwarded_auth_socket_name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002652}
2653
2654/* removes the agent forwarding socket */
2655
Damien Miller4af51302000-04-16 11:18:38 +10002656void
Damien Miller95def091999-11-25 00:26:21 +11002657cleanup_socket(void)
2658{
Damien Miller78315eb2000-09-29 23:01:36 +11002659 unlink(channel_forwarded_auth_socket_name);
Damien Miller95def091999-11-25 00:26:21 +11002660 rmdir(channel_forwarded_auth_socket_dir);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002661}
2662
Damien Miller5428f641999-11-25 11:54:57 +11002663/*
Damien Millerd3a18572000-06-07 19:55:44 +10002664 * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.
Damien Miller5428f641999-11-25 11:54:57 +11002665 * This starts forwarding authentication requests.
2666 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002667
Damien Millerd3a18572000-06-07 19:55:44 +10002668int
Damien Miller95def091999-11-25 00:26:21 +11002669auth_input_request_forwarding(struct passwd * pw)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002670{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002671 Channel *nc;
2672 int sock;
Damien Miller95def091999-11-25 00:26:21 +11002673 struct sockaddr_un sunaddr;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002674
Damien Miller95def091999-11-25 00:26:21 +11002675 if (auth_get_socket_name() != NULL)
2676 fatal("Protocol error: authentication forwarding requested twice.");
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002677
Damien Miller95def091999-11-25 00:26:21 +11002678 /* Temporarily drop privileged uid for mkdir/bind. */
Ben Lindstrom3fcf1a22001-04-08 18:26:59 +00002679 temporarily_use_uid(pw);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002680
Damien Miller95def091999-11-25 00:26:21 +11002681 /* Allocate a buffer for the socket name, and format the name. */
2682 channel_forwarded_auth_socket_name = xmalloc(MAX_SOCKET_NAME);
2683 channel_forwarded_auth_socket_dir = xmalloc(MAX_SOCKET_NAME);
2684 strlcpy(channel_forwarded_auth_socket_dir, "/tmp/ssh-XXXXXXXX", MAX_SOCKET_NAME);
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002685
Damien Miller95def091999-11-25 00:26:21 +11002686 /* Create private directory for socket */
Damien Millerd3a18572000-06-07 19:55:44 +10002687 if (mkdtemp(channel_forwarded_auth_socket_dir) == NULL) {
2688 packet_send_debug("Agent forwarding disabled: mkdtemp() failed: %.100s",
2689 strerror(errno));
2690 restore_uid();
2691 xfree(channel_forwarded_auth_socket_name);
2692 xfree(channel_forwarded_auth_socket_dir);
2693 channel_forwarded_auth_socket_name = NULL;
2694 channel_forwarded_auth_socket_dir = NULL;
2695 return 0;
2696 }
Damien Miller95def091999-11-25 00:26:21 +11002697 snprintf(channel_forwarded_auth_socket_name, MAX_SOCKET_NAME, "%s/agent.%d",
2698 channel_forwarded_auth_socket_dir, (int) getpid());
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002699
Damien Miller95def091999-11-25 00:26:21 +11002700 if (atexit(cleanup_socket) < 0) {
2701 int saved = errno;
2702 cleanup_socket();
2703 packet_disconnect("socket: %.100s", strerror(saved));
2704 }
2705 /* Create the socket. */
2706 sock = socket(AF_UNIX, SOCK_STREAM, 0);
2707 if (sock < 0)
2708 packet_disconnect("socket: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002709
Damien Miller95def091999-11-25 00:26:21 +11002710 /* Bind it to the name. */
2711 memset(&sunaddr, 0, sizeof(sunaddr));
2712 sunaddr.sun_family = AF_UNIX;
2713 strncpy(sunaddr.sun_path, channel_forwarded_auth_socket_name,
2714 sizeof(sunaddr.sun_path));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002715
Damien Miller95def091999-11-25 00:26:21 +11002716 if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
2717 packet_disconnect("bind: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002718
Damien Miller95def091999-11-25 00:26:21 +11002719 /* Restore the privileged uid. */
2720 restore_uid();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002721
Damien Miller95def091999-11-25 00:26:21 +11002722 /* Start listening on the socket. */
2723 if (listen(sock, 5) < 0)
2724 packet_disconnect("listen: %.100s", strerror(errno));
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002725
Damien Miller95def091999-11-25 00:26:21 +11002726 /* Allocate a channel for the authentication agent socket. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002727 nc = channel_new("auth socket",
Damien Miller0bc1bd82000-11-13 22:57:25 +11002728 SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
2729 CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
2730 0, xstrdup("auth socket"), 1);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002731 if (nc == NULL) {
2732 error("auth_input_request_forwarding: channel_new failed");
2733 close(sock);
2734 return 0;
2735 }
2736 strlcpy(nc->path, channel_forwarded_auth_socket_name, sizeof(nc->path));
Damien Millerd3a18572000-06-07 19:55:44 +10002737 return 1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002738}
2739
2740/* This is called to process an SSH_SMSG_AGENT_OPEN message. */
2741
Damien Miller4af51302000-04-16 11:18:38 +10002742void
Damien Miller62cee002000-09-23 17:15:56 +11002743auth_input_open_request(int type, int plen, void *ctxt)
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002744{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002745 Channel *c = NULL;
2746 int remote_id, sock;
Damien Miller95def091999-11-25 00:26:21 +11002747 char *dummyname;
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002748
Damien Millerb38eff82000-04-01 11:09:21 +10002749 packet_integrity_check(plen, 4, type);
2750
Damien Miller95def091999-11-25 00:26:21 +11002751 /* Read the remote channel number from the message. */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002752 remote_id = packet_get_int();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002753
Damien Miller5428f641999-11-25 11:54:57 +11002754 /*
2755 * Get a connection to the local authentication agent (this may again
2756 * get forwarded).
2757 */
Damien Miller95def091999-11-25 00:26:21 +11002758 sock = ssh_get_authentication_socket();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002759
Damien Miller5428f641999-11-25 11:54:57 +11002760 /*
2761 * If we could not connect the agent, send an error message back to
2762 * the server. This should never happen unless the agent dies,
2763 * because authentication forwarding is only enabled if we have an
2764 * agent.
2765 */
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002766 if (sock >= 0) {
2767 dummyname = xstrdup("authentication agent connection");
2768 c = channel_new("", SSH_CHANNEL_OPEN, sock, sock, -1, 0, 0, 0, dummyname, 1);
2769 if (c == NULL) {
2770 error("auth_input_open_request: channel_new failed");
2771 close(sock);
2772 } else {
2773 c->remote_id = remote_id;
2774 }
Damien Miller95def091999-11-25 00:26:21 +11002775 }
Ben Lindstrom99c73b32001-05-05 04:09:47 +00002776 if (c == NULL) {
2777 packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
2778 packet_put_int(remote_id);
2779 } else {
2780 /* Send a confirmation to the remote host. */
2781 debug("Forwarding authentication connection.");
2782 packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
2783 packet_put_int(remote_id);
2784 packet_put_int(c->self);
2785 }
Damien Miller95def091999-11-25 00:26:21 +11002786 packet_send();
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002787}
Damien Miller33b13562000-04-04 14:38:59 +10002788
2789void
Damien Millerbd483e72000-04-30 10:00:53 +10002790channel_start_open(int id)
Damien Miller33b13562000-04-04 14:38:59 +10002791{
2792 Channel *c = channel_lookup(id);
2793 if (c == NULL) {
2794 log("channel_open: %d: bad id", id);
2795 return;
2796 }
Damien Millerbd483e72000-04-30 10:00:53 +10002797 debug("send channel open %d", id);
Damien Miller33b13562000-04-04 14:38:59 +10002798 packet_start(SSH2_MSG_CHANNEL_OPEN);
2799 packet_put_cstring(c->ctype);
2800 packet_put_int(c->self);
2801 packet_put_int(c->local_window);
2802 packet_put_int(c->local_maxpacket);
Damien Millerbd483e72000-04-30 10:00:53 +10002803}
2804void
2805channel_open(int id)
2806{
2807 /* XXX REMOVE ME */
2808 channel_start_open(id);
Damien Miller33b13562000-04-04 14:38:59 +10002809 packet_send();
Damien Miller33b13562000-04-04 14:38:59 +10002810}
2811void
2812channel_request(int id, char *service, int wantconfirm)
2813{
2814 channel_request_start(id, service, wantconfirm);
2815 packet_send();
2816 debug("channel request %d: %s", id, service) ;
2817}
2818void
2819channel_request_start(int id, char *service, int wantconfirm)
2820{
2821 Channel *c = channel_lookup(id);
2822 if (c == NULL) {
2823 log("channel_request: %d: bad id", id);
2824 return;
2825 }
2826 packet_start(SSH2_MSG_CHANNEL_REQUEST);
2827 packet_put_int(c->remote_id);
2828 packet_put_cstring(service);
2829 packet_put_char(wantconfirm);
2830}
2831void
2832channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg)
2833{
2834 Channel *c = channel_lookup(id);
2835 if (c == NULL) {
2836 log("channel_register_callback: %d: bad id", id);
2837 return;
2838 }
2839 c->cb_event = mtype;
2840 c->cb_fn = fn;
2841 c->cb_arg = arg;
2842}
2843void
2844channel_register_cleanup(int id, channel_callback_fn *fn)
2845{
2846 Channel *c = channel_lookup(id);
2847 if (c == NULL) {
2848 log("channel_register_cleanup: %d: bad id", id);
2849 return;
2850 }
2851 c->dettach_user = fn;
2852}
2853void
2854channel_cancel_cleanup(int id)
2855{
2856 Channel *c = channel_lookup(id);
2857 if (c == NULL) {
2858 log("channel_cancel_cleanup: %d: bad id", id);
2859 return;
2860 }
2861 c->dettach_user = NULL;
2862}
Kevin Stevesef4eea92001-02-05 12:42:17 +00002863void
Damien Millerad833b32000-08-23 10:46:23 +10002864channel_register_filter(int id, channel_filter_fn *fn)
2865{
2866 Channel *c = channel_lookup(id);
2867 if (c == NULL) {
2868 log("channel_register_filter: %d: bad id", id);
2869 return;
2870 }
2871 c->input_filter = fn;
2872}
Damien Miller33b13562000-04-04 14:38:59 +10002873
2874void
Damien Miller69b69aa2000-10-28 14:19:58 +11002875channel_set_fds(int id, int rfd, int wfd, int efd,
2876 int extusage, int nonblock)
Damien Miller33b13562000-04-04 14:38:59 +10002877{
2878 Channel *c = channel_lookup(id);
2879 if (c == NULL || c->type != SSH_CHANNEL_LARVAL)
2880 fatal("channel_activate for non-larval channel %d.", id);
Damien Miller69b69aa2000-10-28 14:19:58 +11002881 channel_register_fds(c, rfd, wfd, efd, extusage, nonblock);
Damien Miller33b13562000-04-04 14:38:59 +10002882 c->type = SSH_CHANNEL_OPEN;
Damien Miller33b13562000-04-04 14:38:59 +10002883 /* XXX window size? */
Damien Millere4340be2000-09-16 13:29:08 +11002884 c->local_window = c->local_window_max = c->local_maxpacket * 2;
Damien Miller33b13562000-04-04 14:38:59 +10002885 packet_start(SSH2_MSG_CHANNEL_WINDOW_ADJUST);
2886 packet_put_int(c->remote_id);
2887 packet_put_int(c->local_window);
2888 packet_send();
2889}