blob: ccbad617d51d094872b40478bf337068cba91768 [file] [log] [blame]
Damien Millerce986542013-07-18 16:12:44 +10001/* $OpenBSD: serverloop.c,v 1.168 2013/07/12 00:19:59 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Server main loop for handling the interactive session.
Damien Millere4340be2000-09-16 13:29:08 +11007 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 *
Damien Millerefb4afe2000-04-12 18:45:05 +100014 * SSH2 support by Markus Friedl.
Ben Lindstrom44697232001-07-04 03:32:30 +000015 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110016 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Millerefb4afe2000-04-12 18:45:05 +100036 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
38#include "includes.h"
Damien Miller9cf6d072006-03-15 11:29:24 +110039
40#include <sys/types.h>
Damien Miller8dbffe72006-08-05 11:02:17 +100041#include <sys/param.h>
Damien Miller9cf6d072006-03-15 11:29:24 +110042#include <sys/wait.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100043#include <sys/socket.h>
Damien Miller9aec9192006-08-05 10:57:45 +100044#ifdef HAVE_SYS_TIME_H
45# include <sys/time.h>
46#endif
Damien Miller8ec8c3e2006-07-10 20:35:38 +100047
48#include <netinet/in.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110049
Darren Tucker39972492006-07-12 22:22:46 +100050#include <errno.h>
Damien Miller57cf6382006-07-10 21:13:46 +100051#include <fcntl.h>
Damien Miller9f2abc42006-07-10 20:53:08 +100052#include <pwd.h>
Damien Miller6ff3cad2006-03-15 11:52:09 +110053#include <signal.h>
Damien Millere3476ed2006-07-24 14:13:33 +100054#include <string.h>
Damien Miller99bd21e2006-03-15 11:11:28 +110055#include <termios.h>
Damien Miller1cdde6f2006-07-24 14:07:35 +100056#include <unistd.h>
Damien Millerd7834352006-08-05 12:39:39 +100057#include <stdarg.h>
Damien Miller69b69aa2000-10-28 14:19:58 +110058
Damien Millerb84886b2008-05-19 15:05:07 +100059#include "openbsd-compat/sys-queue.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100060#include "xmalloc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100061#include "packet.h"
62#include "buffer.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000063#include "log.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100064#include "servconf.h"
Damien Miller16aed052002-09-22 01:26:27 +100065#include "canohost.h"
Ben Lindstromd95c09c2001-02-18 19:13:33 +000066#include "sshpty.h"
Ben Lindstromc7637672001-06-09 00:36:26 +000067#include "channels.h"
Damien Millerb38eff82000-04-01 11:09:21 +100068#include "compat.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000069#include "ssh1.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100070#include "ssh2.h"
Damien Millerd7834352006-08-05 12:39:39 +100071#include "key.h"
72#include "cipher.h"
73#include "kex.h"
74#include "hostfile.h"
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000075#include "auth.h"
Damien Millerefb4afe2000-04-12 18:45:05 +100076#include "session.h"
Damien Millerb38eff82000-04-01 11:09:21 +100077#include "dispatch.h"
Damien Millerf6d9e222000-06-18 14:50:44 +100078#include "auth-options.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000079#include "serverloop.h"
80#include "misc.h"
Darren Tuckerc5564e12009-06-21 18:53:53 +100081#include "roaming.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100082
Damien Miller50a41ed2000-10-16 12:14:42 +110083extern ServerOptions options;
84
Ben Lindstrom8ac91062001-04-04 17:57:54 +000085/* XXX */
86extern Kex *xxx_kex;
Darren Tucker3e33cec2003-10-02 16:12:36 +100087extern Authctxt *the_authctxt;
Damien Miller24ecf612005-11-05 15:16:52 +110088extern int use_privsep;
Ben Lindstrom8ac91062001-04-04 17:57:54 +000089
Damien Millerd4a8b7e1999-10-27 13:42:43 +100090static Buffer stdin_buffer; /* Buffer for stdin data. */
91static Buffer stdout_buffer; /* Buffer for stdout data. */
92static Buffer stderr_buffer; /* Buffer for stderr data. */
93static int fdin; /* Descriptor for stdin (for writing) */
94static int fdout; /* Descriptor for stdout (for reading);
95 May be same number as fdin. */
96static int fderr; /* Descriptor for stderr. May be -1. */
97static long stdin_bytes = 0; /* Number of bytes written to stdin. */
98static long stdout_bytes = 0; /* Number of stdout bytes sent to client. */
99static long stderr_bytes = 0; /* Number of stderr bytes sent to client. */
100static long fdout_bytes = 0; /* Number of stdout bytes read from program. */
101static int stdin_eof = 0; /* EOF message received from client. */
102static int fdout_eof = 0; /* EOF encountered reading from fdout. */
103static int fderr_eof = 0; /* EOF encountered readung from fderr. */
Damien Miller225736c2001-02-19 21:51:08 +1100104static int fdin_is_tty = 0; /* fdin points to a tty. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000105static int connection_in; /* Connection to client (input). */
106static int connection_out; /* Connection to client (output). */
Ben Lindstrome34ab4c2001-04-07 01:12:11 +0000107static int connection_closed = 0; /* Connection to client closed. */
108static u_int buffer_high; /* "Soft" max buffer size. */
Darren Tucker8901fa92008-06-11 09:34:01 +1000109static int no_more_sessions = 0; /* Disallow further sessions. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000110
Damien Miller5428f641999-11-25 11:54:57 +1100111/*
112 * This SIGCHLD kludge is used to detect when the child exits. The server
113 * will exit after that, as soon as forwarded connections have terminated.
114 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000115
Ben Lindstrom5e71c542001-12-06 16:48:14 +0000116static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000117
Damien Miller24ecf612005-11-05 15:16:52 +1100118/* Cleanup on signals (!use_privsep case only) */
119static volatile sig_atomic_t received_sigterm = 0;
120
Ben Lindstrombba81212001-06-25 05:01:22 +0000121/* prototypes */
122static void server_init_dispatch(void);
Damien Millerb38eff82000-04-01 11:09:21 +1000123
Damien Millerf6681a32001-12-21 14:53:11 +1100124/*
125 * we write to this pipe if a SIGCHLD is caught in order to avoid
126 * the race between select() and child_terminated
127 */
128static int notify_pipe[2];
129static void
130notify_setup(void)
131{
132 if (pipe(notify_pipe) < 0) {
133 error("pipe(notify_pipe) failed %s", strerror(errno));
Damien Miller814ace02011-05-20 19:02:47 +1000134 } else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) ||
135 (fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) {
Damien Millerf6681a32001-12-21 14:53:11 +1100136 error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno));
137 close(notify_pipe[0]);
138 close(notify_pipe[1]);
139 } else {
140 set_nonblock(notify_pipe[0]);
141 set_nonblock(notify_pipe[1]);
142 return;
143 }
144 notify_pipe[0] = -1; /* read end */
145 notify_pipe[1] = -1; /* write end */
146}
147static void
148notify_parent(void)
149{
150 if (notify_pipe[1] != -1)
Darren Tuckerdbee3082013-05-16 20:32:29 +1000151 (void)write(notify_pipe[1], "", 1);
Damien Millerf6681a32001-12-21 14:53:11 +1100152}
153static void
154notify_prepare(fd_set *readset)
155{
156 if (notify_pipe[0] != -1)
157 FD_SET(notify_pipe[0], readset);
158}
159static void
160notify_done(fd_set *readset)
161{
162 char c;
163
164 if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset))
165 while (read(notify_pipe[0], &c, 1) != -1)
166 debug2("notify_done: reading");
167}
168
Damien Millerf0b15df2006-03-26 13:59:20 +1100169/*ARGSUSED*/
Ben Lindstrombba81212001-06-25 05:01:22 +0000170static void
Damien Miller95def091999-11-25 00:26:21 +1100171sigchld_handler(int sig)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000172{
Damien Miller95def091999-11-25 00:26:21 +1100173 int save_errno = errno;
Damien Millerefb4afe2000-04-12 18:45:05 +1000174 child_terminated = 1;
Tim Rice81ed5182002-09-25 17:38:46 -0700175#ifndef _UNICOS
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000176 mysignal(SIGCHLD, sigchld_handler);
Tim Rice81ed5182002-09-25 17:38:46 -0700177#endif
Damien Millerf6681a32001-12-21 14:53:11 +1100178 notify_parent();
Damien Millerefb4afe2000-04-12 18:45:05 +1000179 errno = save_errno;
180}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000181
Damien Millerf0b15df2006-03-26 13:59:20 +1100182/*ARGSUSED*/
Damien Miller24ecf612005-11-05 15:16:52 +1100183static void
184sigterm_handler(int sig)
185{
186 received_sigterm = sig;
187}
188
Damien Miller95def091999-11-25 00:26:21 +1100189/*
Damien Miller95def091999-11-25 00:26:21 +1100190 * Make packets from buffered stderr data, and buffer it for sending
191 * to the client.
192 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000193static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000194make_packets_from_stderr_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000195{
Darren Tucker502d3842003-06-28 12:38:01 +1000196 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000197
Damien Miller95def091999-11-25 00:26:21 +1100198 /* Send buffered stderr data to the client. */
199 while (buffer_len(&stderr_buffer) > 0 &&
Damien Miller037a0dc1999-12-07 15:38:31 +1100200 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100201 len = buffer_len(&stderr_buffer);
202 if (packet_is_interactive()) {
203 if (len > 512)
204 len = 512;
205 } else {
206 /* Keep the packets at reasonable size. */
207 if (len > packet_get_maxsize())
208 len = packet_get_maxsize();
209 }
210 packet_start(SSH_SMSG_STDERR_DATA);
211 packet_put_string(buffer_ptr(&stderr_buffer), len);
212 packet_send();
213 buffer_consume(&stderr_buffer, len);
214 stderr_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000215 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000216}
217
Damien Miller95def091999-11-25 00:26:21 +1100218/*
219 * Make packets from buffered stdout data, and buffer it for sending to the
220 * client.
221 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000222static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000223make_packets_from_stdout_data(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000224{
Darren Tucker502d3842003-06-28 12:38:01 +1000225 u_int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000226
Damien Miller95def091999-11-25 00:26:21 +1100227 /* Send buffered stdout data to the client. */
228 while (buffer_len(&stdout_buffer) > 0 &&
Damien Miller037a0dc1999-12-07 15:38:31 +1100229 packet_not_very_much_data_to_write()) {
Damien Miller95def091999-11-25 00:26:21 +1100230 len = buffer_len(&stdout_buffer);
231 if (packet_is_interactive()) {
232 if (len > 512)
233 len = 512;
234 } else {
235 /* Keep the packets at reasonable size. */
236 if (len > packet_get_maxsize())
Kevin Stevesef4eea92001-02-05 12:42:17 +0000237 len = packet_get_maxsize();
Damien Miller95def091999-11-25 00:26:21 +1100238 }
239 packet_start(SSH_SMSG_STDOUT_DATA);
240 packet_put_string(buffer_ptr(&stdout_buffer), len);
241 packet_send();
242 buffer_consume(&stdout_buffer, len);
243 stdout_bytes += len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000244 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000245}
246
Damien Miller8c3902a2001-10-10 15:01:40 +1000247static void
248client_alive_check(void)
249{
Damien Millerb5820f42003-12-17 16:27:32 +1100250 int channel_id;
Damien Miller056cf732002-01-22 23:21:39 +1100251
Damien Miller8c3902a2001-10-10 15:01:40 +1000252 /* timeout, check to see how many we have had */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000253 if (packet_inc_alive_timeouts() > options.client_alive_count_max) {
Damien Miller985a4482006-10-24 03:02:41 +1000254 logit("Timeout, client not responding.");
255 cleanup_exit(255);
256 }
Damien Miller8c3902a2001-10-10 15:01:40 +1000257
Damien Miller8c3902a2001-10-10 15:01:40 +1000258 /*
Damien Millerb5820f42003-12-17 16:27:32 +1100259 * send a bogus global/channel request with "wantreply",
Damien Miller8c3902a2001-10-10 15:01:40 +1000260 * we should get back a failure
261 */
Damien Millerb5820f42003-12-17 16:27:32 +1100262 if ((channel_id = channel_find_open()) == -1) {
263 packet_start(SSH2_MSG_GLOBAL_REQUEST);
264 packet_put_cstring("keepalive@openssh.com");
265 packet_put_char(1); /* boolean: want reply */
266 } else {
267 channel_request_start(channel_id, "keepalive@openssh.com", 1);
268 }
Damien Miller8c3902a2001-10-10 15:01:40 +1000269 packet_send();
270}
271
Damien Miller95def091999-11-25 00:26:21 +1100272/*
273 * Sleep in select() until we can do something. This will initialize the
274 * select masks. Upon return, the masks will indicate which descriptors
275 * have data or can accept data. Optionally, a maximum time can be specified
276 * for the duration of the wait (0 = infinite).
277 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000278static void
Damien Miller5e953212001-01-30 09:14:00 +1100279wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp, int *maxfdp,
Darren Tucker5f96f3b2013-05-16 20:29:28 +1000280 u_int *nallocp, u_int64_t max_time_milliseconds)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000281{
Damien Miller95def091999-11-25 00:26:21 +1100282 struct timeval tv, *tvp;
283 int ret;
Damien Miller6c6da332012-06-20 22:31:26 +1000284 time_t minwait_secs = 0;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000285 int client_alive_scheduled = 0;
Damien Millere42bd242007-01-29 10:16:28 +1100286 int program_alive_scheduled = 0;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000287
Damien Millera6508752012-04-22 11:21:10 +1000288 /* Allocate and update select() masks for channel descriptors. */
289 channel_prepare_select(readsetp, writesetp, maxfdp, nallocp,
290 &minwait_secs, 0);
291
292 if (minwait_secs != 0)
293 max_time_milliseconds = MIN(max_time_milliseconds,
294 (u_int)minwait_secs * 1000);
295
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000296 /*
Damien Miller9f0f5c62001-12-21 14:45:46 +1100297 * if using client_alive, set the max timeout accordingly,
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000298 * and indicate that this particular timeout was for client
299 * alive by setting the client_alive_scheduled flag.
300 *
301 * this could be randomized somewhat to make traffic
Damien Miller9f0f5c62001-12-21 14:45:46 +1100302 * analysis more difficult, but we're not doing it yet.
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000303 */
Ben Lindstrom36857f62001-07-18 15:48:57 +0000304 if (compat20 &&
305 max_time_milliseconds == 0 && options.client_alive_interval) {
Ben Lindstrom2f0304c2001-04-29 19:49:14 +0000306 client_alive_scheduled = 1;
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000307 max_time_milliseconds = options.client_alive_interval * 1000;
Ben Lindstrom36857f62001-07-18 15:48:57 +0000308 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000309
Damien Millerefb4afe2000-04-12 18:45:05 +1000310 if (compat20) {
Damien Milleraf5f2e62001-10-10 15:01:16 +1000311#if 0
Damien Millere247cc42000-05-07 12:03:14 +1000312 /* wrong: bad condition XXX */
Damien Millerefb4afe2000-04-12 18:45:05 +1000313 if (channel_not_very_much_buffered_data())
Damien Milleraf5f2e62001-10-10 15:01:16 +1000314#endif
315 FD_SET(connection_in, *readsetp);
Damien Millerefb4afe2000-04-12 18:45:05 +1000316 } else {
Damien Millerb1715dc2000-05-30 13:44:51 +1000317 /*
318 * Read packets from the client unless we have too much
319 * buffered stdin or channel data.
320 */
321 if (buffer_len(&stdin_buffer) < buffer_high &&
Damien Millerefb4afe2000-04-12 18:45:05 +1000322 channel_not_very_much_buffered_data())
Damien Miller5e953212001-01-30 09:14:00 +1100323 FD_SET(connection_in, *readsetp);
Damien Millerb1715dc2000-05-30 13:44:51 +1000324 /*
325 * If there is not too much data already buffered going to
326 * the client, try to get some more data from the program.
327 */
328 if (packet_not_very_much_data_to_write()) {
Damien Millere42bd242007-01-29 10:16:28 +1100329 program_alive_scheduled = child_terminated;
Damien Millerb1715dc2000-05-30 13:44:51 +1000330 if (!fdout_eof)
Damien Miller5e953212001-01-30 09:14:00 +1100331 FD_SET(fdout, *readsetp);
Damien Millerb1715dc2000-05-30 13:44:51 +1000332 if (!fderr_eof)
Damien Miller5e953212001-01-30 09:14:00 +1100333 FD_SET(fderr, *readsetp);
Damien Millerb1715dc2000-05-30 13:44:51 +1000334 }
335 /*
336 * If we have buffered data, try to write some of that data
337 * to the program.
338 */
339 if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
Damien Miller5e953212001-01-30 09:14:00 +1100340 FD_SET(fdin, *writesetp);
Damien Millerefb4afe2000-04-12 18:45:05 +1000341 }
Damien Millerf6681a32001-12-21 14:53:11 +1100342 notify_prepare(*readsetp);
Damien Miller95def091999-11-25 00:26:21 +1100343
Damien Miller5428f641999-11-25 11:54:57 +1100344 /*
345 * If we have buffered packet data going to the client, mark that
346 * descriptor.
347 */
Damien Miller95def091999-11-25 00:26:21 +1100348 if (packet_have_data_to_write())
Damien Miller5e953212001-01-30 09:14:00 +1100349 FD_SET(connection_out, *writesetp);
Damien Miller95def091999-11-25 00:26:21 +1100350
Damien Miller5428f641999-11-25 11:54:57 +1100351 /*
352 * If child has terminated and there is enough buffer space to read
353 * from it, then read as much as is available and exit.
354 */
Damien Miller95def091999-11-25 00:26:21 +1100355 if (child_terminated && packet_not_very_much_data_to_write())
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000356 if (max_time_milliseconds == 0 || client_alive_scheduled)
Damien Miller95def091999-11-25 00:26:21 +1100357 max_time_milliseconds = 100;
358
359 if (max_time_milliseconds == 0)
360 tvp = NULL;
361 else {
362 tv.tv_sec = max_time_milliseconds / 1000;
363 tv.tv_usec = 1000 * (max_time_milliseconds % 1000);
364 tvp = &tv;
365 }
366
367 /* Wait for something to happen, or the timeout to expire. */
Damien Miller5e953212001-01-30 09:14:00 +1100368 ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
Damien Miller95def091999-11-25 00:26:21 +1100369
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000370 if (ret == -1) {
Damien Miller79faeff2001-11-12 11:06:32 +1100371 memset(*readsetp, 0, *nallocp);
372 memset(*writesetp, 0, *nallocp);
Damien Miller95def091999-11-25 00:26:21 +1100373 if (errno != EINTR)
374 error("select: %.100s", strerror(errno));
Damien Millere42bd242007-01-29 10:16:28 +1100375 } else {
376 if (ret == 0 && client_alive_scheduled)
377 client_alive_check();
378 if (!compat20 && program_alive_scheduled && fdin_is_tty) {
379 if (!fdout_eof)
380 FD_SET(fdout, *readsetp);
381 if (!fderr_eof)
382 FD_SET(fderr, *readsetp);
383 }
384 }
Damien Millerf6681a32001-12-21 14:53:11 +1100385
386 notify_done(*readsetp);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000387}
388
Damien Miller95def091999-11-25 00:26:21 +1100389/*
390 * Processes input from the client and the program. Input data is stored
391 * in buffers and processed later.
392 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000393static void
Damien Miller90fdfaf2006-03-26 14:25:37 +1100394process_input(fd_set *readset)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000395{
Damien Miller95def091999-11-25 00:26:21 +1100396 int len;
397 char buf[16384];
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000398
Damien Miller95def091999-11-25 00:26:21 +1100399 /* Read and buffer any input data from the client. */
400 if (FD_ISSET(connection_in, readset)) {
Darren Tuckerc5564e12009-06-21 18:53:53 +1000401 int cont = 0;
402 len = roaming_read(connection_in, buf, sizeof(buf), &cont);
Damien Miller95def091999-11-25 00:26:21 +1100403 if (len == 0) {
Darren Tuckerc5564e12009-06-21 18:53:53 +1000404 if (cont)
405 return;
Damien Miller16aed052002-09-22 01:26:27 +1000406 verbose("Connection closed by %.100s",
407 get_remote_ipaddr());
Ben Lindstrome34ab4c2001-04-07 01:12:11 +0000408 connection_closed = 1;
409 if (compat20)
410 return;
Darren Tucker3e33cec2003-10-02 16:12:36 +1000411 cleanup_exit(255);
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000412 } else if (len < 0) {
Damien Millerd8968ad2008-07-04 23:10:49 +1000413 if (errno != EINTR && errno != EAGAIN &&
414 errno != EWOULDBLOCK) {
Damien Miller16aed052002-09-22 01:26:27 +1000415 verbose("Read error from remote host "
416 "%.100s: %.100s",
417 get_remote_ipaddr(), strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +1000418 cleanup_exit(255);
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000419 }
420 } else {
421 /* Buffer any received data. */
422 packet_process_incoming(buf, len);
Damien Miller95def091999-11-25 00:26:21 +1100423 }
Damien Miller95def091999-11-25 00:26:21 +1100424 }
Damien Millerefb4afe2000-04-12 18:45:05 +1000425 if (compat20)
426 return;
427
Damien Miller95def091999-11-25 00:26:21 +1100428 /* Read and buffer any available stdout data from the program. */
429 if (!fdout_eof && FD_ISSET(fdout, readset)) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000430 errno = 0;
Damien Miller95def091999-11-25 00:26:21 +1100431 len = read(fdout, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +1000432 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
433 errno == EWOULDBLOCK) && !child_terminated))) {
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000434 /* do nothing */
Darren Tucker03890e42006-06-24 16:58:45 +1000435#ifndef PTY_ZEROREAD
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000436 } else if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000437#else
Darren Tucker144e8d62006-06-25 08:25:25 +1000438 } else if ((!isatty(fdout) && len <= 0) ||
439 (isatty(fdout) && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000440#endif
Damien Miller95def091999-11-25 00:26:21 +1100441 fdout_eof = 1;
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000442 } else {
Damien Miller95def091999-11-25 00:26:21 +1100443 buffer_append(&stdout_buffer, buf, len);
444 fdout_bytes += len;
445 }
446 }
447 /* Read and buffer any available stderr data from the program. */
448 if (!fderr_eof && FD_ISSET(fderr, readset)) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000449 errno = 0;
Damien Miller95def091999-11-25 00:26:21 +1100450 len = read(fderr, buf, sizeof(buf));
Damien Millerd8968ad2008-07-04 23:10:49 +1000451 if (len < 0 && (errno == EINTR || ((errno == EAGAIN ||
452 errno == EWOULDBLOCK) && !child_terminated))) {
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000453 /* do nothing */
Darren Tucker03890e42006-06-24 16:58:45 +1000454#ifndef PTY_ZEROREAD
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000455 } else if (len <= 0) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000456#else
Darren Tucker144e8d62006-06-25 08:25:25 +1000457 } else if ((!isatty(fderr) && len <= 0) ||
458 (isatty(fderr) && (len < 0 || (len == 0 && errno != 0)))) {
Darren Tucker9afe1152006-06-23 21:24:12 +1000459#endif
Damien Miller95def091999-11-25 00:26:21 +1100460 fderr_eof = 1;
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000461 } else {
Damien Miller95def091999-11-25 00:26:21 +1100462 buffer_append(&stderr_buffer, buf, len);
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000463 }
Damien Miller95def091999-11-25 00:26:21 +1100464 }
465}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000466
Damien Miller95def091999-11-25 00:26:21 +1100467/*
468 * Sends data from internal buffers to client program stdin.
469 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000470static void
Damien Miller90fdfaf2006-03-26 14:25:37 +1100471process_output(fd_set *writeset)
Damien Miller95def091999-11-25 00:26:21 +1100472{
Ben Lindstromaa630de2001-02-10 23:44:47 +0000473 struct termios tio;
Ben Lindstrom6d218f42001-09-18 05:53:12 +0000474 u_char *data;
475 u_int dlen;
Damien Miller95def091999-11-25 00:26:21 +1100476 int len;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000477
Damien Miller95def091999-11-25 00:26:21 +1100478 /* Write buffered data to program stdin. */
Damien Millerefb4afe2000-04-12 18:45:05 +1000479 if (!compat20 && fdin != -1 && FD_ISSET(fdin, writeset)) {
Ben Lindstrom6d218f42001-09-18 05:53:12 +0000480 data = buffer_ptr(&stdin_buffer);
481 dlen = buffer_len(&stdin_buffer);
482 len = write(fdin, data, dlen);
Damien Millerd8968ad2008-07-04 23:10:49 +1000483 if (len < 0 &&
484 (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)) {
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000485 /* do nothing */
486 } else if (len <= 0) {
Damien Millerb38eff82000-04-01 11:09:21 +1000487 if (fdin != fdout)
Damien Miller95def091999-11-25 00:26:21 +1100488 close(fdin);
489 else
490 shutdown(fdin, SHUT_WR); /* We will no longer send. */
Damien Miller95def091999-11-25 00:26:21 +1100491 fdin = -1;
492 } else {
Ben Lindstromaa630de2001-02-10 23:44:47 +0000493 /* Successful write. */
Ben Lindstrom6d218f42001-09-18 05:53:12 +0000494 if (fdin_is_tty && dlen >= 1 && data[0] != '\r' &&
495 tcgetattr(fdin, &tio) == 0 &&
Damien Miller79438cc2001-02-16 12:34:57 +1100496 !(tio.c_lflag & ECHO) && (tio.c_lflag & ICANON)) {
Kevin Stevesb7f036f2001-02-15 17:27:15 +0000497 /*
498 * Simulate echo to reduce the impact of
499 * traffic analysis
500 */
Ben Lindstrome229b252001-03-05 06:28:06 +0000501 packet_send_ignore(len);
Ben Lindstromaa630de2001-02-10 23:44:47 +0000502 packet_send();
503 }
504 /* Consume the data from the buffer. */
Damien Miller95def091999-11-25 00:26:21 +1100505 buffer_consume(&stdin_buffer, len);
506 /* Update the count of bytes written to the program. */
507 stdin_bytes += len;
508 }
509 }
510 /* Send any buffered packet data to the client. */
511 if (FD_ISSET(connection_out, writeset))
512 packet_write_poll();
513}
514
515/*
516 * Wait until all buffered output has been sent to the client.
517 * This is used when the program terminates.
518 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000519static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000520drain_output(void)
Damien Miller95def091999-11-25 00:26:21 +1100521{
522 /* Send any buffered stdout data to the client. */
523 if (buffer_len(&stdout_buffer) > 0) {
524 packet_start(SSH_SMSG_STDOUT_DATA);
525 packet_put_string(buffer_ptr(&stdout_buffer),
526 buffer_len(&stdout_buffer));
527 packet_send();
528 /* Update the count of sent bytes. */
529 stdout_bytes += buffer_len(&stdout_buffer);
530 }
531 /* Send any buffered stderr data to the client. */
532 if (buffer_len(&stderr_buffer) > 0) {
533 packet_start(SSH_SMSG_STDERR_DATA);
534 packet_put_string(buffer_ptr(&stderr_buffer),
535 buffer_len(&stderr_buffer));
536 packet_send();
537 /* Update the count of sent bytes. */
538 stderr_bytes += buffer_len(&stderr_buffer);
539 }
540 /* Wait until all buffered data has been written to the client. */
541 packet_write_wait();
542}
543
Ben Lindstrombba81212001-06-25 05:01:22 +0000544static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +0000545process_buffered_input_packets(void)
Damien Millerb38eff82000-04-01 11:09:21 +1000546{
Ben Lindstrom8ac91062001-04-04 17:57:54 +0000547 dispatch_run(DISPATCH_NONBLOCK, NULL, compat20 ? xxx_kex : NULL);
Damien Millerb38eff82000-04-01 11:09:21 +1000548}
549
Damien Miller95def091999-11-25 00:26:21 +1100550/*
551 * Performs the interactive session. This handles data transmission between
552 * the client and the program. Note that the notion of stdin, stdout, and
553 * stderr in this function is sort of reversed: this function writes to
554 * stdin (of the child program), and reads from stdout and stderr (of the
555 * child program).
556 */
Damien Miller4af51302000-04-16 11:18:38 +1000557void
Damien Miller166fca82000-04-20 07:42:21 +1000558server_loop(pid_t pid, int fdin_arg, int fdout_arg, int fderr_arg)
Damien Miller95def091999-11-25 00:26:21 +1100559{
Damien Miller5e953212001-01-30 09:14:00 +1100560 fd_set *readset = NULL, *writeset = NULL;
Darren Tuckerc7a6fc42004-08-13 21:18:00 +1000561 int max_fd = 0;
562 u_int nalloc = 0;
Damien Miller166fca82000-04-20 07:42:21 +1000563 int wait_status; /* Status returned by wait(). */
564 pid_t wait_pid; /* pid returned by wait(). */
Damien Miller95def091999-11-25 00:26:21 +1100565 int waiting_termination = 0; /* Have displayed waiting close message. */
Darren Tucker5f96f3b2013-05-16 20:29:28 +1000566 u_int64_t max_time_milliseconds;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000567 u_int previous_stdout_buffer_bytes;
568 u_int stdout_buffer_bytes;
Damien Miller95def091999-11-25 00:26:21 +1100569 int type;
570
571 debug("Entering interactive session.");
572
573 /* Initialize the SIGCHLD kludge. */
Damien Miller95def091999-11-25 00:26:21 +1100574 child_terminated = 0;
Kevin Stevese26a1552001-07-26 17:51:49 +0000575 mysignal(SIGCHLD, sigchld_handler);
Damien Miller95def091999-11-25 00:26:21 +1100576
Damien Miller24ecf612005-11-05 15:16:52 +1100577 if (!use_privsep) {
578 signal(SIGTERM, sigterm_handler);
579 signal(SIGINT, sigterm_handler);
580 signal(SIGQUIT, sigterm_handler);
581 }
582
Damien Miller95def091999-11-25 00:26:21 +1100583 /* Initialize our global variables. */
584 fdin = fdin_arg;
585 fdout = fdout_arg;
586 fderr = fderr_arg;
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000587
588 /* nonblocking IO */
589 set_nonblock(fdin);
590 set_nonblock(fdout);
Damien Miller7d6656c2000-05-20 15:22:36 +1000591 /* we don't have stderr for interactive terminal sessions, see below */
592 if (fderr != -1)
593 set_nonblock(fderr);
Damien Millerdcb6ecd2000-05-17 22:34:22 +1000594
Damien Miller225736c2001-02-19 21:51:08 +1100595 if (!(datafellows & SSH_BUG_IGNOREMSG) && isatty(fdin))
596 fdin_is_tty = 1;
597
Damien Miller95def091999-11-25 00:26:21 +1100598 connection_in = packet_get_connection_in();
599 connection_out = packet_get_connection_out();
600
Damien Millerf6681a32001-12-21 14:53:11 +1100601 notify_setup();
602
Damien Miller95def091999-11-25 00:26:21 +1100603 previous_stdout_buffer_bytes = 0;
604
605 /* Set approximate I/O buffer size. */
606 if (packet_is_interactive())
607 buffer_high = 4096;
608 else
609 buffer_high = 64 * 1024;
610
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000611#if 0
Damien Miller95def091999-11-25 00:26:21 +1100612 /* Initialize max_fd to the maximum of the known file descriptors. */
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000613 max_fd = MAX(connection_in, connection_out);
614 max_fd = MAX(max_fd, fdin);
615 max_fd = MAX(max_fd, fdout);
Damien Miller5e953212001-01-30 09:14:00 +1100616 if (fderr != -1)
617 max_fd = MAX(max_fd, fderr);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000618#endif
Damien Miller95def091999-11-25 00:26:21 +1100619
620 /* Initialize Initialize buffers. */
621 buffer_init(&stdin_buffer);
622 buffer_init(&stdout_buffer);
623 buffer_init(&stderr_buffer);
624
Damien Miller5428f641999-11-25 11:54:57 +1100625 /*
626 * If we have no separate fderr (which is the case when we have a pty
627 * - there we cannot make difference between data sent to stdout and
628 * stderr), indicate that we have seen an EOF from stderr. This way
Damien Miller788f2122005-11-05 15:14:59 +1100629 * we don't need to check the descriptor everywhere.
Damien Miller5428f641999-11-25 11:54:57 +1100630 */
Damien Miller95def091999-11-25 00:26:21 +1100631 if (fderr == -1)
632 fderr_eof = 1;
633
Damien Millerb38eff82000-04-01 11:09:21 +1000634 server_init_dispatch();
635
Damien Miller95def091999-11-25 00:26:21 +1100636 /* Main loop of the server for the interactive session mode. */
637 for (;;) {
Damien Miller95def091999-11-25 00:26:21 +1100638
639 /* Process buffered packets from the client. */
640 process_buffered_input_packets();
641
Damien Miller5428f641999-11-25 11:54:57 +1100642 /*
643 * If we have received eof, and there is no more pending
644 * input data, cause a real eof by closing fdin.
645 */
Damien Miller95def091999-11-25 00:26:21 +1100646 if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) {
Damien Millerb38eff82000-04-01 11:09:21 +1000647 if (fdin != fdout)
Damien Miller95def091999-11-25 00:26:21 +1100648 close(fdin);
649 else
650 shutdown(fdin, SHUT_WR); /* We will no longer send. */
Damien Miller95def091999-11-25 00:26:21 +1100651 fdin = -1;
652 }
Damien Miller5428f641999-11-25 11:54:57 +1100653 /* Make packets from buffered stderr data to send to the client. */
Damien Miller95def091999-11-25 00:26:21 +1100654 make_packets_from_stderr_data();
655
Damien Miller5428f641999-11-25 11:54:57 +1100656 /*
657 * Make packets from buffered stdout data to send to the
658 * client. If there is very little to send, this arranges to
659 * not send them now, but to wait a short while to see if we
660 * are getting more data. This is necessary, as some systems
661 * wake up readers from a pty after each separate character.
662 */
Damien Miller95def091999-11-25 00:26:21 +1100663 max_time_milliseconds = 0;
664 stdout_buffer_bytes = buffer_len(&stdout_buffer);
665 if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 &&
666 stdout_buffer_bytes != previous_stdout_buffer_bytes) {
667 /* try again after a while */
668 max_time_milliseconds = 10;
669 } else {
670 /* Send it now. */
671 make_packets_from_stdout_data();
672 }
673 previous_stdout_buffer_bytes = buffer_len(&stdout_buffer);
674
675 /* Send channel data to the client. */
676 if (packet_not_very_much_data_to_write())
677 channel_output_poll();
678
Damien Miller5428f641999-11-25 11:54:57 +1100679 /*
680 * Bail out of the loop if the program has closed its output
681 * descriptors, and we have no more data to send to the
682 * client, and there is no pending buffered data.
683 */
Damien Miller43dc8da2000-11-29 15:55:17 +1100684 if (fdout_eof && fderr_eof && !packet_have_data_to_write() &&
685 buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) {
Damien Miller95def091999-11-25 00:26:21 +1100686 if (!channel_still_open())
Damien Millerb38eff82000-04-01 11:09:21 +1000687 break;
Damien Miller95def091999-11-25 00:26:21 +1100688 if (!waiting_termination) {
689 const char *s = "Waiting for forwarded connections to terminate...\r\n";
690 char *cp;
691 waiting_termination = 1;
692 buffer_append(&stderr_buffer, s, strlen(s));
693
694 /* Display list of open channels. */
695 cp = channel_open_message();
696 buffer_append(&stderr_buffer, cp, strlen(cp));
Darren Tuckera627d422013-06-02 07:31:17 +1000697 free(cp);
Damien Miller95def091999-11-25 00:26:21 +1100698 }
699 }
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000700 max_fd = MAX(connection_in, connection_out);
701 max_fd = MAX(max_fd, fdin);
702 max_fd = MAX(max_fd, fdout);
703 max_fd = MAX(max_fd, fderr);
Damien Millerf6681a32001-12-21 14:53:11 +1100704 max_fd = MAX(max_fd, notify_pipe[0]);
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000705
Damien Miller95def091999-11-25 00:26:21 +1100706 /* Sleep in select() until we can do something. */
Damien Miller5e953212001-01-30 09:14:00 +1100707 wait_until_can_do_something(&readset, &writeset, &max_fd,
Ben Lindstrom16d29d52001-07-18 16:01:46 +0000708 &nalloc, max_time_milliseconds);
Damien Miller95def091999-11-25 00:26:21 +1100709
Damien Miller24ecf612005-11-05 15:16:52 +1100710 if (received_sigterm) {
Darren Tucker3e1027c2012-12-07 13:07:46 +1100711 logit("Exiting on signal %d", (int)received_sigterm);
Damien Miller24ecf612005-11-05 15:16:52 +1100712 /* Clean up sessions, utmp, etc. */
713 cleanup_exit(255);
714 }
715
Damien Miller95def091999-11-25 00:26:21 +1100716 /* Process any channel events. */
Damien Miller5e953212001-01-30 09:14:00 +1100717 channel_after_select(readset, writeset);
Damien Miller95def091999-11-25 00:26:21 +1100718
719 /* Process input from the client and from program stdout/stderr. */
Damien Miller5e953212001-01-30 09:14:00 +1100720 process_input(readset);
Damien Miller95def091999-11-25 00:26:21 +1100721
722 /* Process output to the client and to program stdin. */
Damien Miller5e953212001-01-30 09:14:00 +1100723 process_output(writeset);
Damien Miller95def091999-11-25 00:26:21 +1100724 }
Darren Tuckera627d422013-06-02 07:31:17 +1000725 free(readset);
726 free(writeset);
Damien Miller95def091999-11-25 00:26:21 +1100727
Damien Miller95def091999-11-25 00:26:21 +1100728 /* Cleanup and termination code. */
729
730 /* Wait until all output has been sent to the client. */
731 drain_output();
732
733 debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.",
Damien Miller9f0f5c62001-12-21 14:45:46 +1100734 stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes);
Damien Miller95def091999-11-25 00:26:21 +1100735
736 /* Free and clear the buffers. */
737 buffer_free(&stdin_buffer);
738 buffer_free(&stdout_buffer);
739 buffer_free(&stderr_buffer);
740
741 /* Close the file descriptors. */
742 if (fdout != -1)
743 close(fdout);
744 fdout = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000745 fdout_eof = 1;
Damien Miller95def091999-11-25 00:26:21 +1100746 if (fderr != -1)
747 close(fderr);
748 fderr = -1;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000749 fderr_eof = 1;
Damien Miller95def091999-11-25 00:26:21 +1100750 if (fdin != -1)
751 close(fdin);
752 fdin = -1;
753
Ben Lindstrom601e4362001-06-21 03:19:23 +0000754 channel_free_all();
Damien Miller95def091999-11-25 00:26:21 +1100755
Damien Miller95def091999-11-25 00:26:21 +1100756 /* We no longer want our SIGCHLD handler to be called. */
Kevin Stevese26a1552001-07-26 17:51:49 +0000757 mysignal(SIGCHLD, SIG_DFL);
Damien Miller95def091999-11-25 00:26:21 +1100758
Ben Lindstrom47fd8112002-04-02 20:48:19 +0000759 while ((wait_pid = waitpid(-1, &wait_status, 0)) < 0)
760 if (errno != EINTR)
761 packet_disconnect("wait: %.100s", strerror(errno));
762 if (wait_pid != pid)
Ben Lindstromce0f6342002-06-11 16:42:49 +0000763 error("Strange, wait returned pid %ld, expected %ld",
764 (long)wait_pid, (long)pid);
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000765
Damien Miller95def091999-11-25 00:26:21 +1100766 /* Check if it exited normally. */
767 if (WIFEXITED(wait_status)) {
768 /* Yes, normal exit. Get exit status and send it to the client. */
769 debug("Command exited with status %d.", WEXITSTATUS(wait_status));
770 packet_start(SSH_SMSG_EXITSTATUS);
771 packet_put_int(WEXITSTATUS(wait_status));
772 packet_send();
773 packet_write_wait();
774
Damien Miller5428f641999-11-25 11:54:57 +1100775 /*
776 * Wait for exit confirmation. Note that there might be
777 * other packets coming before it; however, the program has
778 * already died so we just ignore them. The client is
779 * supposed to respond with the confirmation when it receives
780 * the exit status.
781 */
Damien Miller95def091999-11-25 00:26:21 +1100782 do {
Damien Millerdff50992002-01-22 23:16:32 +1100783 type = packet_read();
Damien Miller95def091999-11-25 00:26:21 +1100784 }
785 while (type != SSH_CMSG_EXIT_CONFIRMATION);
786
787 debug("Received exit confirmation.");
788 return;
789 }
790 /* Check if the program terminated due to a signal. */
791 if (WIFSIGNALED(wait_status))
792 packet_disconnect("Command terminated on signal %d.",
793 WTERMSIG(wait_status));
794
795 /* Some weird exit cause. Just exit. */
796 packet_disconnect("wait returned status %04x.", wait_status);
797 /* NOTREACHED */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000798}
Damien Millerb38eff82000-04-01 11:09:21 +1000799
Damien Miller3ec27592001-10-12 11:35:04 +1000800static void
801collect_children(void)
802{
803 pid_t pid;
804 sigset_t oset, nset;
805 int status;
806
807 /* block SIGCHLD while we check for dead children */
808 sigemptyset(&nset);
809 sigaddset(&nset, SIGCHLD);
810 sigprocmask(SIG_BLOCK, &nset, &oset);
811 if (child_terminated) {
Damien Millerec04f362006-03-15 12:01:34 +1100812 debug("Received SIGCHLD.");
Ben Lindstrom47fd8112002-04-02 20:48:19 +0000813 while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
814 (pid < 0 && errno == EINTR))
815 if (pid > 0)
816 session_close_by_pid(pid, status);
Damien Miller3ec27592001-10-12 11:35:04 +1000817 child_terminated = 0;
818 }
819 sigprocmask(SIG_SETMASK, &oset, NULL);
820}
821
Damien Miller4af51302000-04-16 11:18:38 +1000822void
Ben Lindstrombddd5512001-07-04 04:53:53 +0000823server_loop2(Authctxt *authctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +1000824{
Damien Miller5e953212001-01-30 09:14:00 +1100825 fd_set *readset = NULL, *writeset = NULL;
Damien Millerce986542013-07-18 16:12:44 +1000826 int rekeying = 0, max_fd;
827 u_int nalloc = 0;
Darren Tucker5f96f3b2013-05-16 20:29:28 +1000828 u_int64_t rekey_timeout_ms = 0;
Damien Millerefb4afe2000-04-12 18:45:05 +1000829
830 debug("Entering interactive session for SSH2.");
831
Ben Lindstromec46e0b2001-06-09 01:27:31 +0000832 mysignal(SIGCHLD, sigchld_handler);
Damien Millerefb4afe2000-04-12 18:45:05 +1000833 child_terminated = 0;
834 connection_in = packet_get_connection_in();
835 connection_out = packet_get_connection_out();
Damien Miller5e953212001-01-30 09:14:00 +1100836
Damien Miller24ecf612005-11-05 15:16:52 +1100837 if (!use_privsep) {
838 signal(SIGTERM, sigterm_handler);
839 signal(SIGINT, sigterm_handler);
840 signal(SIGQUIT, sigterm_handler);
841 }
842
Damien Millerf6681a32001-12-21 14:53:11 +1100843 notify_setup();
844
Damien Miller5e953212001-01-30 09:14:00 +1100845 max_fd = MAX(connection_in, connection_out);
Damien Millerf6681a32001-12-21 14:53:11 +1100846 max_fd = MAX(max_fd, notify_pipe[0]);
847
Damien Millerefb4afe2000-04-12 18:45:05 +1000848 server_init_dispatch();
849
850 for (;;) {
851 process_buffered_input_packets();
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000852
Ben Lindstroma3700052001-04-05 23:26:32 +0000853 rekeying = (xxx_kex != NULL && !xxx_kex->done);
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000854
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000855 if (!rekeying && packet_not_very_much_data_to_write())
Damien Millerefb4afe2000-04-12 18:45:05 +1000856 channel_output_poll();
Darren Tucker5f96f3b2013-05-16 20:29:28 +1000857 if (options.rekey_interval > 0 && compat20 && !rekeying)
858 rekey_timeout_ms = packet_get_rekey_timeout() * 1000;
859 else
860 rekey_timeout_ms = 0;
861
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000862 wait_until_can_do_something(&readset, &writeset, &max_fd,
Darren Tucker5f96f3b2013-05-16 20:29:28 +1000863 &nalloc, rekey_timeout_ms);
Damien Miller52b77be2001-10-10 15:14:37 +1000864
Damien Miller24ecf612005-11-05 15:16:52 +1100865 if (received_sigterm) {
Darren Tucker3e1027c2012-12-07 13:07:46 +1100866 logit("Exiting on signal %d", (int)received_sigterm);
Damien Miller24ecf612005-11-05 15:16:52 +1100867 /* Clean up sessions, utmp, etc. */
868 cleanup_exit(255);
869 }
870
Damien Miller3ec27592001-10-12 11:35:04 +1000871 collect_children();
Damien Millera5539d22003-04-09 20:50:06 +1000872 if (!rekeying) {
Ben Lindstrom8e312f32001-04-04 23:50:21 +0000873 channel_after_select(readset, writeset);
Damien Millera5539d22003-04-09 20:50:06 +1000874 if (packet_need_rekeying()) {
875 debug("need rekeying");
876 xxx_kex->done = 0;
877 kex_send_kexinit(xxx_kex);
878 }
879 }
Damien Miller5e953212001-01-30 09:14:00 +1100880 process_input(readset);
Ben Lindstrome34ab4c2001-04-07 01:12:11 +0000881 if (connection_closed)
882 break;
Damien Miller5e953212001-01-30 09:14:00 +1100883 process_output(writeset);
Damien Millerefb4afe2000-04-12 18:45:05 +1000884 }
Damien Miller3ec27592001-10-12 11:35:04 +1000885 collect_children();
886
Darren Tuckera627d422013-06-02 07:31:17 +1000887 free(readset);
888 free(writeset);
Damien Miller5e953212001-01-30 09:14:00 +1100889
Damien Miller52b77be2001-10-10 15:14:37 +1000890 /* free all channels, no more reads and writes */
891 channel_free_all();
Ben Lindstrom4983d5e2001-07-04 05:17:40 +0000892
Damien Miller3ec27592001-10-12 11:35:04 +1000893 /* free remaining sessions, e.g. remove wtmp entries */
Ben Lindstrom7a2073c2002-03-22 02:30:41 +0000894 session_destroy_all(NULL);
Damien Millerefb4afe2000-04-12 18:45:05 +1000895}
896
Ben Lindstrombba81212001-06-25 05:01:22 +0000897static void
Damien Millerb5820f42003-12-17 16:27:32 +1100898server_input_keep_alive(int type, u_int32_t seq, void *ctxt)
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000899{
Damien Millerb5820f42003-12-17 16:27:32 +1100900 debug("Got %d/%u for keepalive", type, seq);
Damien Miller9f0f5c62001-12-21 14:45:46 +1100901 /*
Ben Lindstrom2f0304c2001-04-29 19:49:14 +0000902 * reset timeout, since we got a sane answer from the client.
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000903 * even if this was generated by something other than
904 * the bogus CHANNEL_REQUEST we send for keepalives.
905 */
Darren Tuckerf7288d72009-06-21 18:12:20 +1000906 packet_set_alive_timeouts(0);
Ben Lindstrom5744dc42001-04-13 23:28:01 +0000907}
908
Ben Lindstrombba81212001-06-25 05:01:22 +0000909static void
Damien Miller630d6f42002-01-22 23:17:30 +1100910server_input_stdin_data(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000911{
912 char *data;
Ben Lindstrom46c16222000-12-22 01:43:59 +0000913 u_int data_len;
Damien Millerb38eff82000-04-01 11:09:21 +1000914
915 /* Stdin data from the client. Append it to the buffer. */
916 /* Ignore any data if the client has closed stdin. */
917 if (fdin == -1)
918 return;
919 data = packet_get_string(&data_len);
Damien Miller48b03fc2002-01-22 23:11:40 +1100920 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000921 buffer_append(&stdin_buffer, data, data_len);
922 memset(data, 0, data_len);
Darren Tuckera627d422013-06-02 07:31:17 +1000923 free(data);
Damien Millerb38eff82000-04-01 11:09:21 +1000924}
925
Ben Lindstrombba81212001-06-25 05:01:22 +0000926static void
Damien Miller630d6f42002-01-22 23:17:30 +1100927server_input_eof(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000928{
929 /*
930 * Eof from the client. The stdin descriptor to the
931 * program will be closed when all buffered data has
932 * drained.
933 */
934 debug("EOF received for stdin.");
Damien Miller48b03fc2002-01-22 23:11:40 +1100935 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000936 stdin_eof = 1;
937}
938
Ben Lindstrombba81212001-06-25 05:01:22 +0000939static void
Damien Miller630d6f42002-01-22 23:17:30 +1100940server_input_window_size(int type, u_int32_t seq, void *ctxt)
Damien Millerb38eff82000-04-01 11:09:21 +1000941{
Damien Miller71a73672006-03-26 14:04:36 +1100942 u_int row = packet_get_int();
943 u_int col = packet_get_int();
944 u_int xpixel = packet_get_int();
945 u_int ypixel = packet_get_int();
Damien Millerb38eff82000-04-01 11:09:21 +1000946
947 debug("Window change received.");
Damien Miller48b03fc2002-01-22 23:11:40 +1100948 packet_check_eom();
Damien Millerb38eff82000-04-01 11:09:21 +1000949 if (fdin != -1)
950 pty_change_window_size(fdin, row, col, xpixel, ypixel);
951}
952
Ben Lindstrombba81212001-06-25 05:01:22 +0000953static Channel *
Damien Millerfb1310e2004-01-21 11:02:50 +1100954server_request_direct_tcpip(void)
Damien Millerefb4afe2000-04-12 18:45:05 +1000955{
Damien Milleraa5b3f82012-12-03 09:50:54 +1100956 Channel *c = NULL;
Damien Miller4af51302000-04-16 11:18:38 +1000957 char *target, *originator;
Damien Miller3dc71ad2009-01-28 16:31:22 +1100958 u_short target_port, originator_port;
Damien Millerefb4afe2000-04-12 18:45:05 +1000959
Damien Miller4af51302000-04-16 11:18:38 +1000960 target = packet_get_string(NULL);
961 target_port = packet_get_int();
Damien Millerefb4afe2000-04-12 18:45:05 +1000962 originator = packet_get_string(NULL);
963 originator_port = packet_get_int();
Damien Miller48b03fc2002-01-22 23:11:40 +1100964 packet_check_eom();
Damien Millerb1715dc2000-05-30 13:44:51 +1000965
Damien Millerbd740252008-05-19 15:37:09 +1000966 debug("server_request_direct_tcpip: originator %s port %d, target %s "
967 "port %d", originator, originator_port, target, target_port);
Damien Millerf6d9e222000-06-18 14:50:44 +1000968
Damien Milleraa5b3f82012-12-03 09:50:54 +1100969 /* XXX fine grained permissions */
970 if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 &&
971 !no_port_forwarding_flag) {
972 c = channel_connect_to(target, target_port,
973 "direct-tcpip", "direct-tcpip");
974 } else {
975 logit("refused local port forward: "
976 "originator %s port %d, target %s port %d",
977 originator, originator_port, target, target_port);
978 }
Damien Millerbd740252008-05-19 15:37:09 +1000979
Darren Tuckera627d422013-06-02 07:31:17 +1000980 free(originator);
981 free(target);
Damien Millerbd740252008-05-19 15:37:09 +1000982
Ben Lindstrom99c73b32001-05-05 04:09:47 +0000983 return c;
Damien Miller0bc1bd82000-11-13 22:57:25 +1100984}
985
Ben Lindstrombba81212001-06-25 05:01:22 +0000986static Channel *
Damien Millerd27b9472005-12-13 19:29:02 +1100987server_request_tun(void)
988{
989 Channel *c = NULL;
Damien Miller7b58e802005-12-13 19:33:19 +1100990 int mode, tun;
991 int sock;
Damien Millerd27b9472005-12-13 19:29:02 +1100992
Damien Miller7b58e802005-12-13 19:33:19 +1100993 mode = packet_get_int();
994 switch (mode) {
995 case SSH_TUNMODE_POINTOPOINT:
996 case SSH_TUNMODE_ETHERNET:
997 break;
998 default:
999 packet_send_debug("Unsupported tunnel device mode.");
1000 return NULL;
1001 }
1002 if ((options.permit_tun & mode) == 0) {
1003 packet_send_debug("Server has rejected tunnel device "
1004 "forwarding");
Damien Millerd27b9472005-12-13 19:29:02 +11001005 return NULL;
1006 }
1007
1008 tun = packet_get_int();
Darren Tucker0d0e8f02005-12-20 16:08:42 +11001009 if (forced_tun_device != -1) {
Damien Millerf0b15df2006-03-26 13:59:20 +11001010 if (tun != SSH_TUNID_ANY && forced_tun_device != tun)
Damien Millerd27b9472005-12-13 19:29:02 +11001011 goto done;
1012 tun = forced_tun_device;
1013 }
Damien Miller7b58e802005-12-13 19:33:19 +11001014 sock = tun_open(tun, mode);
Damien Millerd27b9472005-12-13 19:29:02 +11001015 if (sock < 0)
1016 goto done;
1017 c = channel_new("tun", SSH_CHANNEL_OPEN, sock, sock, -1,
1018 CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
1019 c->datagram = 1;
Damien Miller598bbc22005-12-31 16:33:36 +11001020#if defined(SSH_TUN_FILTER)
1021 if (mode == SSH_TUNMODE_POINTOPOINT)
1022 channel_register_filter(c->self, sys_tun_infilter,
Darren Tucker1cf65ae2008-06-13 05:09:18 +10001023 sys_tun_outfilter, NULL, NULL);
Damien Miller598bbc22005-12-31 16:33:36 +11001024#endif
Damien Millerd27b9472005-12-13 19:29:02 +11001025
1026 done:
1027 if (c == NULL)
1028 packet_send_debug("Failed to open the tunnel device.");
1029 return c;
1030}
1031
1032static Channel *
Damien Millerfb1310e2004-01-21 11:02:50 +11001033server_request_session(void)
Damien Miller0bc1bd82000-11-13 22:57:25 +11001034{
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001035 Channel *c;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001036
1037 debug("input_session_request");
Damien Miller48b03fc2002-01-22 23:11:40 +11001038 packet_check_eom();
Darren Tucker8901fa92008-06-11 09:34:01 +10001039
1040 if (no_more_sessions) {
1041 packet_disconnect("Possible attack: attempt to open a session "
1042 "after additional sessions disabled");
1043 }
1044
Damien Miller0bc1bd82000-11-13 22:57:25 +11001045 /*
1046 * A server session has no fd to read or write until a
1047 * CHANNEL_REQUEST for a shell is made, so we set the type to
1048 * SSH_CHANNEL_LARVAL. Additionally, a callback for handling all
1049 * CHANNEL_REQUEST messages is registered.
1050 */
Damien Millerfb1310e2004-01-21 11:02:50 +11001051 c = channel_new("session", SSH_CHANNEL_LARVAL,
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001052 -1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT,
Damien Millerb1ca8bb2003-05-14 13:45:42 +10001053 0, "server-session", 1);
Darren Tucker3e33cec2003-10-02 16:12:36 +10001054 if (session_open(the_authctxt, c->self) != 1) {
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001055 debug("session open failed, free channel %d", c->self);
1056 channel_free(c);
1057 return NULL;
1058 }
Damien Miller39eda6e2005-11-05 14:52:50 +11001059 channel_register_cleanup(c->self, session_close_by_channel, 0);
Ben Lindstrom99c73b32001-05-05 04:09:47 +00001060 return c;
Damien Millerefb4afe2000-04-12 18:45:05 +10001061}
1062
Ben Lindstrombba81212001-06-25 05:01:22 +00001063static void
Damien Miller630d6f42002-01-22 23:17:30 +11001064server_input_channel_open(int type, u_int32_t seq, void *ctxt)
Damien Millerefb4afe2000-04-12 18:45:05 +10001065{
1066 Channel *c = NULL;
1067 char *ctype;
Damien Millerefb4afe2000-04-12 18:45:05 +10001068 int rchan;
Ben Lindstrom4fed2be2002-06-25 23:17:36 +00001069 u_int rmaxpack, rwindow, len;
Damien Millerefb4afe2000-04-12 18:45:05 +10001070
1071 ctype = packet_get_string(&len);
1072 rchan = packet_get_int();
1073 rwindow = packet_get_int();
1074 rmaxpack = packet_get_int();
1075
Damien Miller62cee002000-09-23 17:15:56 +11001076 debug("server_input_channel_open: ctype %s rchan %d win %d max %d",
Damien Millerefb4afe2000-04-12 18:45:05 +10001077 ctype, rchan, rwindow, rmaxpack);
1078
1079 if (strcmp(ctype, "session") == 0) {
Damien Millerfb1310e2004-01-21 11:02:50 +11001080 c = server_request_session();
Damien Millerefb4afe2000-04-12 18:45:05 +10001081 } else if (strcmp(ctype, "direct-tcpip") == 0) {
Damien Millerfb1310e2004-01-21 11:02:50 +11001082 c = server_request_direct_tcpip();
Damien Millerd27b9472005-12-13 19:29:02 +11001083 } else if (strcmp(ctype, "tun@openssh.com") == 0) {
1084 c = server_request_tun();
Damien Millerefb4afe2000-04-12 18:45:05 +10001085 }
1086 if (c != NULL) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001087 debug("server_input_channel_open: confirm %s", ctype);
Damien Millerefb4afe2000-04-12 18:45:05 +10001088 c->remote_id = rchan;
1089 c->remote_window = rwindow;
1090 c->remote_maxpacket = rmaxpack;
Ben Lindstrom69128662001-05-08 20:07:39 +00001091 if (c->type != SSH_CHANNEL_CONNECTING) {
1092 packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
1093 packet_put_int(c->remote_id);
1094 packet_put_int(c->self);
1095 packet_put_int(c->local_window);
1096 packet_put_int(c->local_maxpacket);
1097 packet_send();
1098 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001099 } else {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001100 debug("server_input_channel_open: failure %s", ctype);
Damien Millerefb4afe2000-04-12 18:45:05 +10001101 packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
1102 packet_put_int(rchan);
1103 packet_put_int(SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED);
Ben Lindstromf3436742001-04-29 19:52:00 +00001104 if (!(datafellows & SSH_BUG_OPENFAILURE)) {
Ben Lindstrom69128662001-05-08 20:07:39 +00001105 packet_put_cstring("open failed");
Ben Lindstromf3436742001-04-29 19:52:00 +00001106 packet_put_cstring("");
1107 }
Damien Millerefb4afe2000-04-12 18:45:05 +10001108 packet_send();
1109 }
Darren Tuckera627d422013-06-02 07:31:17 +10001110 free(ctype);
Damien Millerefb4afe2000-04-12 18:45:05 +10001111}
1112
Ben Lindstrombba81212001-06-25 05:01:22 +00001113static void
Damien Miller630d6f42002-01-22 23:17:30 +11001114server_input_global_request(int type, u_int32_t seq, void *ctxt)
Damien Miller0bc1bd82000-11-13 22:57:25 +11001115{
1116 char *rtype;
1117 int want_reply;
Damien Miller4bf648f2009-02-14 16:28:21 +11001118 int success = 0, allocated_listen_port = 0;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001119
1120 rtype = packet_get_string(NULL);
1121 want_reply = packet_get_char();
1122 debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply);
Kevin Stevesef4eea92001-02-05 12:42:17 +00001123
Ben Lindstrom7bb8b492001-03-17 00:47:54 +00001124 /* -R style forwarding */
Damien Miller0bc1bd82000-11-13 22:57:25 +11001125 if (strcmp(rtype, "tcpip-forward") == 0) {
1126 struct passwd *pw;
1127 char *listen_address;
1128 u_short listen_port;
1129
Darren Tucker3e33cec2003-10-02 16:12:36 +10001130 pw = the_authctxt->pw;
Damien Miller4bb1dd32003-11-18 22:01:25 +11001131 if (pw == NULL || !the_authctxt->valid)
Damien Miller3e3b5142003-11-17 21:13:40 +11001132 fatal("server_input_global_request: no/invalid user");
Damien Miller9fc7c692003-06-04 22:50:54 +10001133 listen_address = packet_get_string(NULL);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001134 listen_port = (u_short)packet_get_int();
1135 debug("server_input_global_request: tcpip-forward listen %s port %d",
1136 listen_address, listen_port);
1137
1138 /* check permissions */
Damien Milleraa5b3f82012-12-03 09:50:54 +11001139 if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 ||
Damien Miller330d5852009-02-14 16:33:09 +11001140 no_port_forwarding_flag ||
1141 (!want_reply && listen_port == 0)
Ben Lindstrom99a4e142002-07-09 14:06:40 +00001142#ifndef NO_IPPORT_RESERVED_CONCEPT
Damien Millere5d5a172009-09-09 11:07:28 +10001143 || (listen_port != 0 && listen_port < IPPORT_RESERVED &&
1144 pw->pw_uid != 0)
Ben Lindstrom99a4e142002-07-09 14:06:40 +00001145#endif
Damien Millerb6f72f52005-07-17 17:26:43 +10001146 ) {
Damien Miller0bc1bd82000-11-13 22:57:25 +11001147 success = 0;
1148 packet_send_debug("Server has disabled port forwarding.");
1149 } else {
1150 /* Start listening on the port */
Damien Millerb16461c2002-01-22 23:29:22 +11001151 success = channel_setup_remote_fwd_listener(
Damien Miller330d5852009-02-14 16:33:09 +11001152 listen_address, listen_port,
1153 &allocated_listen_port, options.gateway_ports);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001154 }
Darren Tuckera627d422013-06-02 07:31:17 +10001155 free(listen_address);
Darren Tuckere7066df2004-05-24 10:18:05 +10001156 } else if (strcmp(rtype, "cancel-tcpip-forward") == 0) {
1157 char *cancel_address;
1158 u_short cancel_port;
1159
1160 cancel_address = packet_get_string(NULL);
1161 cancel_port = (u_short)packet_get_int();
1162 debug("%s: cancel-tcpip-forward addr %s port %d", __func__,
1163 cancel_address, cancel_port);
1164
1165 success = channel_cancel_rport_listener(cancel_address,
1166 cancel_port);
Darren Tuckera627d422013-06-02 07:31:17 +10001167 free(cancel_address);
Darren Tucker8901fa92008-06-11 09:34:01 +10001168 } else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) {
1169 no_more_sessions = 1;
1170 success = 1;
Damien Miller0bc1bd82000-11-13 22:57:25 +11001171 }
1172 if (want_reply) {
1173 packet_start(success ?
1174 SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
Damien Miller4bf648f2009-02-14 16:28:21 +11001175 if (success && allocated_listen_port > 0)
1176 packet_put_int(allocated_listen_port);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001177 packet_send();
1178 packet_write_wait();
1179 }
Darren Tuckera627d422013-06-02 07:31:17 +10001180 free(rtype);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001181}
Damien Miller4f7becb2006-03-26 14:10:14 +11001182
Damien Millerc7ef63d2002-02-05 12:21:42 +11001183static void
1184server_input_channel_req(int type, u_int32_t seq, void *ctxt)
1185{
1186 Channel *c;
1187 int id, reply, success = 0;
1188 char *rtype;
1189
1190 id = packet_get_int();
1191 rtype = packet_get_string(NULL);
1192 reply = packet_get_char();
1193
1194 debug("server_input_channel_req: channel %d request %s reply %d",
1195 id, rtype, reply);
1196
1197 if ((c = channel_lookup(id)) == NULL)
1198 packet_disconnect("server_input_channel_req: "
1199 "unknown channel %d", id);
Damien Millerbab9bd42008-05-19 16:06:47 +10001200 if (!strcmp(rtype, "eow@openssh.com")) {
1201 packet_check_eom();
1202 chan_rcvd_eow(c);
Darren Tucker8810dd42008-07-02 22:32:14 +10001203 } else if ((c->type == SSH_CHANNEL_LARVAL ||
1204 c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0)
Damien Millerc7ef63d2002-02-05 12:21:42 +11001205 success = session_input_channel_req(c, rtype);
1206 if (reply) {
1207 packet_start(success ?
1208 SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
1209 packet_put_int(c->remote_id);
1210 packet_send();
1211 }
Darren Tuckera627d422013-06-02 07:31:17 +10001212 free(rtype);
Damien Millerc7ef63d2002-02-05 12:21:42 +11001213}
Damien Miller0bc1bd82000-11-13 22:57:25 +11001214
Ben Lindstrombba81212001-06-25 05:01:22 +00001215static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001216server_init_dispatch_20(void)
Damien Millerefb4afe2000-04-12 18:45:05 +10001217{
1218 debug("server_init_dispatch_20");
1219 dispatch_init(&dispatch_protocol_error);
1220 dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
1221 dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
1222 dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
1223 dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
1224 dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);
1225 dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1226 dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
Damien Millerc7ef63d2002-02-05 12:21:42 +11001227 dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req);
Damien Millerefb4afe2000-04-12 18:45:05 +10001228 dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
Damien Miller0bc1bd82000-11-13 22:57:25 +11001229 dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request);
Ben Lindstrom5744dc42001-04-13 23:28:01 +00001230 /* client_alive */
Damien Miller5a33ec62008-12-08 09:55:02 +11001231 dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive);
1232 dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive);
Damien Millerb5820f42003-12-17 16:27:32 +11001233 dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive);
1234 dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive);
Ben Lindstrom8ac91062001-04-04 17:57:54 +00001235 /* rekeying */
1236 dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
Damien Millerefb4afe2000-04-12 18:45:05 +10001237}
Ben Lindstrombba81212001-06-25 05:01:22 +00001238static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001239server_init_dispatch_13(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001240{
1241 debug("server_init_dispatch_13");
1242 dispatch_init(NULL);
1243 dispatch_set(SSH_CMSG_EOF, &server_input_eof);
1244 dispatch_set(SSH_CMSG_STDIN_DATA, &server_input_stdin_data);
1245 dispatch_set(SSH_CMSG_WINDOW_SIZE, &server_input_window_size);
1246 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_close);
1247 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_close_confirmation);
1248 dispatch_set(SSH_MSG_CHANNEL_DATA, &channel_input_data);
1249 dispatch_set(SSH_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
1250 dispatch_set(SSH_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
1251 dispatch_set(SSH_MSG_PORT_OPEN, &channel_input_port_open);
1252}
Ben Lindstrombba81212001-06-25 05:01:22 +00001253static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001254server_init_dispatch_15(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001255{
1256 server_init_dispatch_13();
1257 debug("server_init_dispatch_15");
1258 dispatch_set(SSH_MSG_CHANNEL_CLOSE, &channel_input_ieof);
1259 dispatch_set(SSH_MSG_CHANNEL_CLOSE_CONFIRMATION, &channel_input_oclose);
1260}
Ben Lindstrombba81212001-06-25 05:01:22 +00001261static void
Ben Lindstrom31ca54a2001-02-09 02:11:24 +00001262server_init_dispatch(void)
Damien Millerb38eff82000-04-01 11:09:21 +10001263{
Damien Millerefb4afe2000-04-12 18:45:05 +10001264 if (compat20)
1265 server_init_dispatch_20();
1266 else if (compat13)
Damien Millerb38eff82000-04-01 11:09:21 +10001267 server_init_dispatch_13();
1268 else
1269 server_init_dispatch_15();
1270}