2018-05-06 12:24:45 +00:00
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/* $OpenBSD: serverloop.c,v 1.198 2017/09/12 06:35:32 djm Exp $ */
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2000-02-24 14:29:47 +00:00
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* Server main loop for handling the interactive session.
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2000-09-10 08:31:17 +00:00
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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2000-05-15 04:37:24 +00:00
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* SSH2 support by Markus Friedl.
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2002-03-18 09:55:03 +00:00
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* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
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2000-09-10 08:31:17 +00:00
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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2000-05-15 04:37:24 +00:00
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*/
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2000-02-24 14:29:47 +00:00
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#include "includes.h"
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2006-09-30 13:29:51 +00:00
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#include <netinet/in.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <signal.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include <stdarg.h>
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2000-12-05 02:20:19 +00:00
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2008-07-23 09:33:08 +00:00
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#include "openbsd-compat/sys-queue.h"
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2000-02-24 14:29:47 +00:00
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#include "xmalloc.h"
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#include "packet.h"
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#include "buffer.h"
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2001-05-04 03:57:05 +00:00
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#include "log.h"
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2015-01-05 16:09:55 +00:00
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#include "misc.h"
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2000-02-24 14:29:47 +00:00
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#include "servconf.h"
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2002-10-29 09:43:00 +00:00
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#include "canohost.h"
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2001-05-04 03:57:05 +00:00
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#include "sshpty.h"
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2000-05-15 04:37:24 +00:00
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#include "channels.h"
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#include "compat.h"
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#include "ssh2.h"
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2006-09-30 13:29:51 +00:00
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#include "key.h"
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#include "cipher.h"
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#include "kex.h"
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#include "hostfile.h"
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2001-05-04 03:57:05 +00:00
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#include "auth.h"
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2000-05-15 04:37:24 +00:00
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#include "session.h"
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#include "dispatch.h"
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2000-09-10 08:31:17 +00:00
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#include "auth-options.h"
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2001-05-04 03:57:05 +00:00
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#include "serverloop.h"
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2015-07-02 13:15:34 +00:00
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#include "ssherr.h"
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2000-02-24 14:29:47 +00:00
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2000-12-05 02:20:19 +00:00
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extern ServerOptions options;
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2001-05-04 03:57:05 +00:00
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/* XXX */
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2004-02-26 10:38:49 +00:00
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extern Authctxt *the_authctxt;
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2006-03-22 19:46:12 +00:00
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extern int use_privsep;
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2001-05-04 03:57:05 +00:00
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2008-07-23 09:33:08 +00:00
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static int no_more_sessions = 0; /* Disallow further sessions. */
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2000-02-24 14:29:47 +00:00
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/*
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* This SIGCHLD kludge is used to detect when the child exits. The server
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* will exit after that, as soon as forwarded connections have terminated.
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*/
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2002-03-18 09:55:03 +00:00
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static volatile sig_atomic_t child_terminated = 0; /* The child has terminated. */
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2000-02-24 14:29:47 +00:00
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2006-03-22 19:46:12 +00:00
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/* Cleanup on signals (!use_privsep case only) */
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static volatile sig_atomic_t received_sigterm = 0;
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2002-03-18 09:55:03 +00:00
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/* prototypes */
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static void server_init_dispatch(void);
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2000-05-15 04:37:24 +00:00
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2002-03-18 09:55:03 +00:00
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/*
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* we write to this pipe if a SIGCHLD is caught in order to avoid
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* the race between select() and child_terminated
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*/
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static int notify_pipe[2];
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static void
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notify_setup(void)
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2000-02-24 14:29:47 +00:00
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{
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2002-03-18 09:55:03 +00:00
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if (pipe(notify_pipe) < 0) {
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error("pipe(notify_pipe) failed %s", strerror(errno));
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2011-09-28 08:14:41 +00:00
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} else if ((fcntl(notify_pipe[0], F_SETFD, FD_CLOEXEC) == -1) ||
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(fcntl(notify_pipe[1], F_SETFD, FD_CLOEXEC) == -1)) {
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2002-03-18 09:55:03 +00:00
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error("fcntl(notify_pipe, F_SETFD) failed %s", strerror(errno));
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close(notify_pipe[0]);
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close(notify_pipe[1]);
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} else {
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set_nonblock(notify_pipe[0]);
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set_nonblock(notify_pipe[1]);
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return;
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2000-02-24 14:29:47 +00:00
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}
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2002-03-18 09:55:03 +00:00
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notify_pipe[0] = -1; /* read end */
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notify_pipe[1] = -1; /* write end */
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2000-02-24 14:29:47 +00:00
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}
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2002-03-18 09:55:03 +00:00
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static void
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notify_parent(void)
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{
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if (notify_pipe[1] != -1)
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2013-09-18 17:27:38 +00:00
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(void)write(notify_pipe[1], "", 1);
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2002-03-18 09:55:03 +00:00
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}
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static void
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notify_prepare(fd_set *readset)
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{
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if (notify_pipe[0] != -1)
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FD_SET(notify_pipe[0], readset);
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}
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static void
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notify_done(fd_set *readset)
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{
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char c;
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if (notify_pipe[0] != -1 && FD_ISSET(notify_pipe[0], readset))
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while (read(notify_pipe[0], &c, 1) != -1)
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debug2("notify_done: reading");
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}
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2006-09-30 13:29:51 +00:00
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/*ARGSUSED*/
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2002-03-18 09:55:03 +00:00
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static void
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sigchld_handler(int sig)
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2000-02-24 14:29:47 +00:00
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{
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2000-05-15 04:37:24 +00:00
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int save_errno = errno;
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child_terminated = 1;
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2002-10-29 09:43:00 +00:00
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#ifndef _UNICOS
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2002-06-27 22:31:32 +00:00
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mysignal(SIGCHLD, sigchld_handler);
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2002-10-29 09:43:00 +00:00
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#endif
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2002-03-18 09:55:03 +00:00
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notify_parent();
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2000-05-15 04:37:24 +00:00
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errno = save_errno;
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2000-02-24 14:29:47 +00:00
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}
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2006-09-30 13:29:51 +00:00
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/*ARGSUSED*/
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2006-03-22 19:46:12 +00:00
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static void
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sigterm_handler(int sig)
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{
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received_sigterm = sig;
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}
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2002-03-18 09:55:03 +00:00
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static void
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2018-05-06 12:24:45 +00:00
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client_alive_check(struct ssh *ssh)
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2002-03-18 09:55:03 +00:00
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{
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2004-02-26 10:38:49 +00:00
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int channel_id;
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2002-03-18 09:55:03 +00:00
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/* timeout, check to see how many we have had */
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2009-10-01 15:19:37 +00:00
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if (packet_inc_alive_timeouts() > options.client_alive_count_max) {
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2006-11-10 16:39:21 +00:00
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logit("Timeout, client not responding.");
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cleanup_exit(255);
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}
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2002-03-18 09:55:03 +00:00
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/*
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2004-02-26 10:38:49 +00:00
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* send a bogus global/channel request with "wantreply",
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2002-03-18 09:55:03 +00:00
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* we should get back a failure
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*/
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2018-05-06 12:24:45 +00:00
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if ((channel_id = channel_find_open(ssh)) == -1) {
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2004-02-26 10:38:49 +00:00
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packet_start(SSH2_MSG_GLOBAL_REQUEST);
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packet_put_cstring("keepalive@openssh.com");
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packet_put_char(1); /* boolean: want reply */
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} else {
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2018-05-06 12:24:45 +00:00
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channel_request_start(ssh, channel_id,
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"keepalive@openssh.com", 1);
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2004-02-26 10:38:49 +00:00
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}
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2002-03-18 09:55:03 +00:00
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packet_send();
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}
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2000-02-24 14:29:47 +00:00
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/*
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* Sleep in select() until we can do something. This will initialize the
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* select masks. Upon return, the masks will indicate which descriptors
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* have data or can accept data. Optionally, a maximum time can be specified
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* for the duration of the wait (0 = infinite).
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*/
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2002-03-18 09:55:03 +00:00
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static void
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2018-05-06 12:24:45 +00:00
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wait_until_can_do_something(struct ssh *ssh,
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int connection_in, int connection_out,
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2017-01-31 12:33:47 +00:00
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fd_set **readsetp, fd_set **writesetp, int *maxfdp,
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2017-01-31 12:29:48 +00:00
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u_int *nallocp, u_int64_t max_time_ms)
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2000-02-24 14:29:47 +00:00
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{
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struct timeval tv, *tvp;
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int ret;
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2012-08-29 15:55:54 +00:00
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time_t minwait_secs = 0;
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2001-05-04 03:57:05 +00:00
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int client_alive_scheduled = 0;
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2018-05-06 12:24:45 +00:00
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static time_t last_client_time;
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2001-05-04 03:57:05 +00:00
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2012-08-29 15:55:54 +00:00
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/* Allocate and update select() masks for channel descriptors. */
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2018-05-06 12:24:45 +00:00
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channel_prepare_select(ssh, readsetp, writesetp, maxfdp,
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nallocp, &minwait_secs);
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2012-08-29 15:55:54 +00:00
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2017-01-31 12:29:48 +00:00
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/* XXX need proper deadline system for rekey/client alive */
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2012-08-29 15:55:54 +00:00
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if (minwait_secs != 0)
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2017-01-31 12:33:47 +00:00
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max_time_ms = MINIMUM(max_time_ms, (u_int)minwait_secs * 1000);
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2012-08-29 15:55:54 +00:00
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2001-05-04 03:57:05 +00:00
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/*
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2002-03-18 09:55:03 +00:00
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* if using client_alive, set the max timeout accordingly,
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2001-05-04 03:57:05 +00:00
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* and indicate that this particular timeout was for client
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* alive by setting the client_alive_scheduled flag.
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*
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* this could be randomized somewhat to make traffic
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2002-03-18 09:55:03 +00:00
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* analysis more difficult, but we're not doing it yet.
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2001-05-04 03:57:05 +00:00
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*/
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2017-01-31 12:33:47 +00:00
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if (options.client_alive_interval) {
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2017-01-31 12:29:48 +00:00
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uint64_t keepalive_ms =
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(uint64_t)options.client_alive_interval * 1000;
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2002-03-18 09:55:03 +00:00
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client_alive_scheduled = 1;
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2017-01-31 12:29:48 +00:00
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if (max_time_ms == 0 || max_time_ms > keepalive_ms)
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max_time_ms = keepalive_ms;
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2002-03-18 09:55:03 +00:00
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}
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2000-02-24 14:29:47 +00:00
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2002-03-18 09:55:03 +00:00
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#if 0
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2017-01-31 12:33:47 +00:00
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/* wrong: bad condition XXX */
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if (channel_not_very_much_buffered_data())
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2002-03-18 09:55:03 +00:00
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#endif
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2017-01-31 12:33:47 +00:00
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FD_SET(connection_in, *readsetp);
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2002-03-18 09:55:03 +00:00
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notify_prepare(*readsetp);
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2000-02-24 14:29:47 +00:00
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/*
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* If we have buffered packet data going to the client, mark that
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* descriptor.
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*/
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if (packet_have_data_to_write())
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2001-05-04 03:57:05 +00:00
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FD_SET(connection_out, *writesetp);
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2000-02-24 14:29:47 +00:00
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/*
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* If child has terminated and there is enough buffer space to read
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* from it, then read as much as is available and exit.
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*/
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if (child_terminated && packet_not_very_much_data_to_write())
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2017-01-31 12:29:48 +00:00
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if (max_time_ms == 0 || client_alive_scheduled)
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max_time_ms = 100;
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2000-02-24 14:29:47 +00:00
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2017-01-31 12:29:48 +00:00
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if (max_time_ms == 0)
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2000-02-24 14:29:47 +00:00
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tvp = NULL;
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else {
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2017-01-31 12:29:48 +00:00
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tv.tv_sec = max_time_ms / 1000;
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tv.tv_usec = 1000 * (max_time_ms % 1000);
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2000-02-24 14:29:47 +00:00
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tvp = &tv;
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}
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/* Wait for something to happen, or the timeout to expire. */
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2001-05-04 03:57:05 +00:00
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ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
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2000-02-24 14:29:47 +00:00
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2001-05-04 03:57:05 +00:00
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if (ret == -1) {
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2002-03-18 09:55:03 +00:00
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memset(*readsetp, 0, *nallocp);
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memset(*writesetp, 0, *nallocp);
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2000-02-24 14:29:47 +00:00
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if (errno != EINTR)
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error("select: %.100s", strerror(errno));
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2018-05-06 12:24:45 +00:00
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} else if (client_alive_scheduled) {
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time_t now = monotime();
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if (ret == 0) { /* timeout */
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client_alive_check(ssh);
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} else if (FD_ISSET(connection_in, *readsetp)) {
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last_client_time = now;
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|
|
} else if (last_client_time != 0 && last_client_time +
|
|
|
|
options.client_alive_interval <= now) {
|
|
|
|
client_alive_check(ssh);
|
|
|
|
last_client_time = now;
|
|
|
|
}
|
|
|
|
}
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
notify_done(*readsetp);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Processes input from the client and the program. Input data is stored
|
|
|
|
* in buffers and processed later.
|
|
|
|
*/
|
2017-01-31 12:33:47 +00:00
|
|
|
static int
|
2018-05-06 12:24:45 +00:00
|
|
|
process_input(struct ssh *ssh, fd_set *readset, int connection_in)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
int len;
|
|
|
|
char buf[16384];
|
|
|
|
|
|
|
|
/* Read and buffer any input data from the client. */
|
|
|
|
if (FD_ISSET(connection_in, readset)) {
|
2016-03-10 20:10:25 +00:00
|
|
|
len = read(connection_in, buf, sizeof(buf));
|
2000-02-24 14:29:47 +00:00
|
|
|
if (len == 0) {
|
2017-01-31 12:29:48 +00:00
|
|
|
verbose("Connection closed by %.100s port %d",
|
|
|
|
ssh_remote_ipaddr(ssh), ssh_remote_port(ssh));
|
2017-01-31 12:33:47 +00:00
|
|
|
return -1;
|
2000-06-03 09:52:37 +00:00
|
|
|
} else if (len < 0) {
|
2008-07-23 09:33:08 +00:00
|
|
|
if (errno != EINTR && errno != EAGAIN &&
|
|
|
|
errno != EWOULDBLOCK) {
|
2002-10-29 09:43:00 +00:00
|
|
|
verbose("Read error from remote host "
|
2017-01-31 12:29:48 +00:00
|
|
|
"%.100s port %d: %.100s",
|
|
|
|
ssh_remote_ipaddr(ssh),
|
|
|
|
ssh_remote_port(ssh), strerror(errno));
|
2004-02-26 10:38:49 +00:00
|
|
|
cleanup_exit(255);
|
2000-06-03 09:52:37 +00:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* Buffer any received data. */
|
|
|
|
packet_process_incoming(buf, len);
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
}
|
2017-01-31 12:33:47 +00:00
|
|
|
return 0;
|
2000-02-24 14:29:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Sends data from internal buffers to client program stdin.
|
|
|
|
*/
|
2002-03-18 09:55:03 +00:00
|
|
|
static void
|
2017-01-31 12:33:47 +00:00
|
|
|
process_output(fd_set *writeset, int connection_out)
|
2000-02-24 14:29:47 +00:00
|
|
|
{
|
|
|
|
/* Send any buffered packet data to the client. */
|
|
|
|
if (FD_ISSET(connection_out, writeset))
|
|
|
|
packet_write_poll();
|
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static void
|
2018-05-06 12:24:45 +00:00
|
|
|
process_buffered_input_packets(struct ssh *ssh)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2018-05-06 12:24:45 +00:00
|
|
|
ssh_dispatch_run_fatal(ssh, DISPATCH_NONBLOCK, NULL);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static void
|
2018-05-06 12:24:45 +00:00
|
|
|
collect_children(struct ssh *ssh)
|
2002-03-18 09:55:03 +00:00
|
|
|
{
|
|
|
|
pid_t pid;
|
|
|
|
sigset_t oset, nset;
|
|
|
|
int status;
|
|
|
|
|
|
|
|
/* block SIGCHLD while we check for dead children */
|
|
|
|
sigemptyset(&nset);
|
|
|
|
sigaddset(&nset, SIGCHLD);
|
|
|
|
sigprocmask(SIG_BLOCK, &nset, &oset);
|
|
|
|
if (child_terminated) {
|
2006-09-30 13:29:51 +00:00
|
|
|
debug("Received SIGCHLD.");
|
2002-06-23 14:01:54 +00:00
|
|
|
while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
|
|
|
|
(pid < 0 && errno == EINTR))
|
|
|
|
if (pid > 0)
|
2018-05-06 12:24:45 +00:00
|
|
|
session_close_by_pid(ssh, pid, status);
|
2002-03-18 09:55:03 +00:00
|
|
|
child_terminated = 0;
|
|
|
|
}
|
|
|
|
sigprocmask(SIG_SETMASK, &oset, NULL);
|
|
|
|
}
|
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
void
|
2018-05-06 12:24:45 +00:00
|
|
|
server_loop2(struct ssh *ssh, Authctxt *authctxt)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2001-05-04 03:57:05 +00:00
|
|
|
fd_set *readset = NULL, *writeset = NULL;
|
2016-03-10 20:10:25 +00:00
|
|
|
int max_fd;
|
2017-01-31 12:33:47 +00:00
|
|
|
u_int nalloc = 0, connection_in, connection_out;
|
2013-09-18 17:27:38 +00:00
|
|
|
u_int64_t rekey_timeout_ms = 0;
|
2000-05-15 04:37:24 +00:00
|
|
|
|
|
|
|
debug("Entering interactive session for SSH2.");
|
|
|
|
|
2002-06-27 22:31:32 +00:00
|
|
|
mysignal(SIGCHLD, sigchld_handler);
|
2000-05-15 04:37:24 +00:00
|
|
|
child_terminated = 0;
|
|
|
|
connection_in = packet_get_connection_in();
|
|
|
|
connection_out = packet_get_connection_out();
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2006-03-22 19:46:12 +00:00
|
|
|
if (!use_privsep) {
|
|
|
|
signal(SIGTERM, sigterm_handler);
|
|
|
|
signal(SIGINT, sigterm_handler);
|
|
|
|
signal(SIGQUIT, sigterm_handler);
|
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
notify_setup();
|
|
|
|
|
2017-01-31 12:33:47 +00:00
|
|
|
max_fd = MAXIMUM(connection_in, connection_out);
|
|
|
|
max_fd = MAXIMUM(max_fd, notify_pipe[0]);
|
2002-03-18 09:55:03 +00:00
|
|
|
|
2000-05-15 04:37:24 +00:00
|
|
|
server_init_dispatch();
|
|
|
|
|
|
|
|
for (;;) {
|
2018-05-06 12:24:45 +00:00
|
|
|
process_buffered_input_packets(ssh);
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2018-05-06 12:24:45 +00:00
|
|
|
if (!ssh_packet_is_rekeying(ssh) &&
|
2016-03-10 20:10:25 +00:00
|
|
|
packet_not_very_much_data_to_write())
|
2018-05-06 12:24:45 +00:00
|
|
|
channel_output_poll(ssh);
|
|
|
|
if (options.rekey_interval > 0 && !ssh_packet_is_rekeying(ssh))
|
2013-09-18 17:27:38 +00:00
|
|
|
rekey_timeout_ms = packet_get_rekey_timeout() * 1000;
|
|
|
|
else
|
|
|
|
rekey_timeout_ms = 0;
|
|
|
|
|
2018-05-06 12:24:45 +00:00
|
|
|
wait_until_can_do_something(ssh, connection_in, connection_out,
|
2017-01-31 12:33:47 +00:00
|
|
|
&readset, &writeset, &max_fd, &nalloc, rekey_timeout_ms);
|
2002-03-18 09:55:03 +00:00
|
|
|
|
2006-03-22 19:46:12 +00:00
|
|
|
if (received_sigterm) {
|
2013-03-22 11:19:48 +00:00
|
|
|
logit("Exiting on signal %d", (int)received_sigterm);
|
2006-03-22 19:46:12 +00:00
|
|
|
/* Clean up sessions, utmp, etc. */
|
|
|
|
cleanup_exit(255);
|
|
|
|
}
|
|
|
|
|
2018-05-06 12:24:45 +00:00
|
|
|
collect_children(ssh);
|
|
|
|
if (!ssh_packet_is_rekeying(ssh))
|
|
|
|
channel_after_select(ssh, readset, writeset);
|
|
|
|
if (process_input(ssh, readset, connection_in) < 0)
|
2001-05-04 03:57:05 +00:00
|
|
|
break;
|
2017-01-31 12:33:47 +00:00
|
|
|
process_output(writeset, connection_out);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
2018-05-06 12:24:45 +00:00
|
|
|
collect_children(ssh);
|
2002-03-18 09:55:03 +00:00
|
|
|
|
2013-09-18 17:27:38 +00:00
|
|
|
free(readset);
|
|
|
|
free(writeset);
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
/* free all channels, no more reads and writes */
|
2018-05-06 12:24:45 +00:00
|
|
|
channel_free_all(ssh);
|
2002-03-18 09:55:03 +00:00
|
|
|
|
|
|
|
/* free remaining sessions, e.g. remove wtmp entries */
|
2018-05-06 12:24:45 +00:00
|
|
|
session_destroy_all(ssh, NULL);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
|
2015-07-02 13:15:34 +00:00
|
|
|
static int
|
2018-05-06 12:24:45 +00:00
|
|
|
server_input_keep_alive(int type, u_int32_t seq, struct ssh *ssh)
|
2001-05-04 03:57:05 +00:00
|
|
|
{
|
2004-02-26 10:38:49 +00:00
|
|
|
debug("Got %d/%u for keepalive", type, seq);
|
2002-03-18 09:55:03 +00:00
|
|
|
/*
|
|
|
|
* reset timeout, since we got a sane answer from the client.
|
2001-05-04 03:57:05 +00:00
|
|
|
* even if this was generated by something other than
|
|
|
|
* the bogus CHANNEL_REQUEST we send for keepalives.
|
|
|
|
*/
|
2009-10-01 15:19:37 +00:00
|
|
|
packet_set_alive_timeouts(0);
|
2015-07-02 13:15:34 +00:00
|
|
|
return 0;
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static Channel *
|
2018-05-06 12:24:45 +00:00
|
|
|
server_request_direct_tcpip(struct ssh *ssh, int *reason, const char **errmsg)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2013-03-22 11:19:48 +00:00
|
|
|
Channel *c = NULL;
|
2000-05-15 04:37:24 +00:00
|
|
|
char *target, *originator;
|
2009-02-24 18:49:27 +00:00
|
|
|
u_short target_port, originator_port;
|
2000-05-15 04:37:24 +00:00
|
|
|
|
|
|
|
target = packet_get_string(NULL);
|
|
|
|
target_port = packet_get_int();
|
|
|
|
originator = packet_get_string(NULL);
|
|
|
|
originator_port = packet_get_int();
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_check_eom();
|
2000-06-03 09:52:37 +00:00
|
|
|
|
2008-07-23 09:33:08 +00:00
|
|
|
debug("server_request_direct_tcpip: originator %s port %d, target %s "
|
|
|
|
"port %d", originator, originator_port, target, target_port);
|
2000-09-10 08:31:17 +00:00
|
|
|
|
2013-03-22 11:19:48 +00:00
|
|
|
/* XXX fine grained permissions */
|
|
|
|
if ((options.allow_tcp_forwarding & FORWARD_LOCAL) != 0 &&
|
2017-01-31 12:33:47 +00:00
|
|
|
!no_port_forwarding_flag && !options.disable_forwarding) {
|
2018-05-06 12:24:45 +00:00
|
|
|
c = channel_connect_to_port(ssh, target, target_port,
|
2017-08-03 10:10:20 +00:00
|
|
|
"direct-tcpip", "direct-tcpip", reason, errmsg);
|
2013-03-22 11:19:48 +00:00
|
|
|
} else {
|
|
|
|
logit("refused local port forward: "
|
|
|
|
"originator %s port %d, target %s port %d",
|
|
|
|
originator, originator_port, target, target_port);
|
2017-08-03 10:10:20 +00:00
|
|
|
if (reason != NULL)
|
|
|
|
*reason = SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED;
|
2013-03-22 11:19:48 +00:00
|
|
|
}
|
2008-07-23 09:33:08 +00:00
|
|
|
|
2013-09-18 17:27:38 +00:00
|
|
|
free(originator);
|
|
|
|
free(target);
|
2008-07-23 09:33:08 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
return c;
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
|
|
|
|
2015-01-05 16:09:55 +00:00
|
|
|
static Channel *
|
2018-05-06 12:24:45 +00:00
|
|
|
server_request_direct_streamlocal(struct ssh *ssh)
|
2015-01-05 16:09:55 +00:00
|
|
|
{
|
|
|
|
Channel *c = NULL;
|
|
|
|
char *target, *originator;
|
|
|
|
u_short originator_port;
|
2017-08-03 10:10:20 +00:00
|
|
|
struct passwd *pw = the_authctxt->pw;
|
|
|
|
|
|
|
|
if (pw == NULL || !the_authctxt->valid)
|
|
|
|
fatal("server_input_global_request: no/invalid user");
|
2015-01-05 16:09:55 +00:00
|
|
|
|
|
|
|
target = packet_get_string(NULL);
|
|
|
|
originator = packet_get_string(NULL);
|
|
|
|
originator_port = packet_get_int();
|
|
|
|
packet_check_eom();
|
|
|
|
|
|
|
|
debug("server_request_direct_streamlocal: originator %s port %d, target %s",
|
|
|
|
originator, originator_port, target);
|
|
|
|
|
|
|
|
/* XXX fine grained permissions */
|
|
|
|
if ((options.allow_streamlocal_forwarding & FORWARD_LOCAL) != 0 &&
|
2017-01-31 12:33:47 +00:00
|
|
|
!no_port_forwarding_flag && !options.disable_forwarding &&
|
2017-08-03 10:10:20 +00:00
|
|
|
(pw->pw_uid == 0 || use_privsep)) {
|
2018-05-06 12:24:45 +00:00
|
|
|
c = channel_connect_to_path(ssh, target,
|
2015-01-05 16:09:55 +00:00
|
|
|
"direct-streamlocal@openssh.com", "direct-streamlocal");
|
|
|
|
} else {
|
|
|
|
logit("refused streamlocal port forward: "
|
|
|
|
"originator %s port %d, target %s",
|
|
|
|
originator, originator_port, target);
|
|
|
|
}
|
|
|
|
|
|
|
|
free(originator);
|
|
|
|
free(target);
|
|
|
|
|
|
|
|
return c;
|
|
|
|
}
|
|
|
|
|
2006-03-22 19:46:12 +00:00
|
|
|
static Channel *
|
2018-05-06 12:24:45 +00:00
|
|
|
server_request_tun(struct ssh *ssh)
|
2006-03-22 19:46:12 +00:00
|
|
|
{
|
|
|
|
Channel *c = NULL;
|
|
|
|
int mode, tun;
|
|
|
|
int sock;
|
|
|
|
|
|
|
|
mode = packet_get_int();
|
|
|
|
switch (mode) {
|
|
|
|
case SSH_TUNMODE_POINTOPOINT:
|
|
|
|
case SSH_TUNMODE_ETHERNET:
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
packet_send_debug("Unsupported tunnel device mode.");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
if ((options.permit_tun & mode) == 0) {
|
|
|
|
packet_send_debug("Server has rejected tunnel device "
|
|
|
|
"forwarding");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
tun = packet_get_int();
|
|
|
|
if (forced_tun_device != -1) {
|
2006-09-30 13:29:51 +00:00
|
|
|
if (tun != SSH_TUNID_ANY && forced_tun_device != tun)
|
2006-03-22 19:46:12 +00:00
|
|
|
goto done;
|
|
|
|
tun = forced_tun_device;
|
|
|
|
}
|
|
|
|
sock = tun_open(tun, mode);
|
|
|
|
if (sock < 0)
|
|
|
|
goto done;
|
2018-05-06 12:24:45 +00:00
|
|
|
c = channel_new(ssh, "tun", SSH_CHANNEL_OPEN, sock, sock, -1,
|
2006-03-22 19:46:12 +00:00
|
|
|
CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
|
|
|
|
c->datagram = 1;
|
|
|
|
#if defined(SSH_TUN_FILTER)
|
|
|
|
if (mode == SSH_TUNMODE_POINTOPOINT)
|
2018-05-06 12:24:45 +00:00
|
|
|
channel_register_filter(ssh, c->self, sys_tun_infilter,
|
2008-07-23 09:33:08 +00:00
|
|
|
sys_tun_outfilter, NULL, NULL);
|
2006-03-22 19:46:12 +00:00
|
|
|
#endif
|
|
|
|
|
|
|
|
done:
|
|
|
|
if (c == NULL)
|
|
|
|
packet_send_debug("Failed to open the tunnel device.");
|
|
|
|
return c;
|
|
|
|
}
|
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
static Channel *
|
2018-05-06 12:24:45 +00:00
|
|
|
server_request_session(struct ssh *ssh)
|
2001-05-04 03:57:05 +00:00
|
|
|
{
|
2002-03-18 09:55:03 +00:00
|
|
|
Channel *c;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
|
|
|
debug("input_session_request");
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_check_eom();
|
2008-07-23 09:33:08 +00:00
|
|
|
|
|
|
|
if (no_more_sessions) {
|
|
|
|
packet_disconnect("Possible attack: attempt to open a session "
|
|
|
|
"after additional sessions disabled");
|
|
|
|
}
|
|
|
|
|
2001-05-04 03:57:05 +00:00
|
|
|
/*
|
|
|
|
* A server session has no fd to read or write until a
|
|
|
|
* CHANNEL_REQUEST for a shell is made, so we set the type to
|
|
|
|
* SSH_CHANNEL_LARVAL. Additionally, a callback for handling all
|
|
|
|
* CHANNEL_REQUEST messages is registered.
|
|
|
|
*/
|
2018-05-06 12:24:45 +00:00
|
|
|
c = channel_new(ssh, "session", SSH_CHANNEL_LARVAL,
|
2002-03-18 09:55:03 +00:00
|
|
|
-1, -1, -1, /*window size*/0, CHAN_SES_PACKET_DEFAULT,
|
2004-01-07 11:10:17 +00:00
|
|
|
0, "server-session", 1);
|
2004-02-26 10:38:49 +00:00
|
|
|
if (session_open(the_authctxt, c->self) != 1) {
|
2002-03-18 09:55:03 +00:00
|
|
|
debug("session open failed, free channel %d", c->self);
|
2018-05-06 12:24:45 +00:00
|
|
|
channel_free(ssh, c);
|
2002-03-18 09:55:03 +00:00
|
|
|
return NULL;
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2018-05-06 12:24:45 +00:00
|
|
|
channel_register_cleanup(ssh, c->self, session_close_by_channel, 0);
|
2002-03-18 09:55:03 +00:00
|
|
|
return c;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
|
2015-07-02 13:15:34 +00:00
|
|
|
static int
|
2018-05-06 12:24:45 +00:00
|
|
|
server_input_channel_open(int type, u_int32_t seq, struct ssh *ssh)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
|
|
|
Channel *c = NULL;
|
|
|
|
char *ctype;
|
2017-08-03 10:10:20 +00:00
|
|
|
const char *errmsg = NULL;
|
|
|
|
int rchan, reason = SSH2_OPEN_CONNECT_FAILED;
|
2002-06-29 11:34:13 +00:00
|
|
|
u_int rmaxpack, rwindow, len;
|
2000-05-15 04:37:24 +00:00
|
|
|
|
|
|
|
ctype = packet_get_string(&len);
|
|
|
|
rchan = packet_get_int();
|
|
|
|
rwindow = packet_get_int();
|
|
|
|
rmaxpack = packet_get_int();
|
|
|
|
|
2000-12-05 02:20:19 +00:00
|
|
|
debug("server_input_channel_open: ctype %s rchan %d win %d max %d",
|
2000-05-15 04:37:24 +00:00
|
|
|
ctype, rchan, rwindow, rmaxpack);
|
|
|
|
|
|
|
|
if (strcmp(ctype, "session") == 0) {
|
2018-05-06 12:24:45 +00:00
|
|
|
c = server_request_session(ssh);
|
2000-05-15 04:37:24 +00:00
|
|
|
} else if (strcmp(ctype, "direct-tcpip") == 0) {
|
2018-05-06 12:24:45 +00:00
|
|
|
c = server_request_direct_tcpip(ssh, &reason, &errmsg);
|
2015-01-05 16:09:55 +00:00
|
|
|
} else if (strcmp(ctype, "direct-streamlocal@openssh.com") == 0) {
|
2018-05-06 12:24:45 +00:00
|
|
|
c = server_request_direct_streamlocal(ssh);
|
2006-03-22 19:46:12 +00:00
|
|
|
} else if (strcmp(ctype, "tun@openssh.com") == 0) {
|
2018-05-06 12:24:45 +00:00
|
|
|
c = server_request_tun(ssh);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
if (c != NULL) {
|
2001-05-04 03:57:05 +00:00
|
|
|
debug("server_input_channel_open: confirm %s", ctype);
|
2000-05-15 04:37:24 +00:00
|
|
|
c->remote_id = rchan;
|
2018-05-06 12:24:45 +00:00
|
|
|
c->have_remote_id = 1;
|
2000-05-15 04:37:24 +00:00
|
|
|
c->remote_window = rwindow;
|
|
|
|
c->remote_maxpacket = rmaxpack;
|
2002-03-18 09:55:03 +00:00
|
|
|
if (c->type != SSH_CHANNEL_CONNECTING) {
|
|
|
|
packet_start(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION);
|
|
|
|
packet_put_int(c->remote_id);
|
|
|
|
packet_put_int(c->self);
|
|
|
|
packet_put_int(c->local_window);
|
|
|
|
packet_put_int(c->local_maxpacket);
|
|
|
|
packet_send();
|
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
} else {
|
2001-05-04 03:57:05 +00:00
|
|
|
debug("server_input_channel_open: failure %s", ctype);
|
2000-05-15 04:37:24 +00:00
|
|
|
packet_start(SSH2_MSG_CHANNEL_OPEN_FAILURE);
|
|
|
|
packet_put_int(rchan);
|
2017-08-03 10:10:20 +00:00
|
|
|
packet_put_int(reason);
|
2002-03-18 09:55:03 +00:00
|
|
|
if (!(datafellows & SSH_BUG_OPENFAILURE)) {
|
2017-08-03 10:10:20 +00:00
|
|
|
packet_put_cstring(errmsg ? errmsg : "open failed");
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_put_cstring("");
|
|
|
|
}
|
2000-05-15 04:37:24 +00:00
|
|
|
packet_send();
|
|
|
|
}
|
2013-09-18 17:27:38 +00:00
|
|
|
free(ctype);
|
2015-07-02 13:15:34 +00:00
|
|
|
return 0;
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|
|
|
|
|
2015-07-02 13:15:34 +00:00
|
|
|
static int
|
2018-05-06 12:24:45 +00:00
|
|
|
server_input_hostkeys_prove(struct ssh *ssh, struct sshbuf **respp)
|
2015-07-02 13:15:34 +00:00
|
|
|
{
|
|
|
|
struct sshbuf *resp = NULL;
|
|
|
|
struct sshbuf *sigbuf = NULL;
|
|
|
|
struct sshkey *key = NULL, *key_pub = NULL, *key_prv = NULL;
|
|
|
|
int r, ndx, success = 0;
|
|
|
|
const u_char *blob;
|
|
|
|
u_char *sig = 0;
|
|
|
|
size_t blen, slen;
|
|
|
|
|
|
|
|
if ((resp = sshbuf_new()) == NULL || (sigbuf = sshbuf_new()) == NULL)
|
|
|
|
fatal("%s: sshbuf_new", __func__);
|
|
|
|
|
|
|
|
while (ssh_packet_remaining(ssh) > 0) {
|
|
|
|
sshkey_free(key);
|
|
|
|
key = NULL;
|
|
|
|
if ((r = sshpkt_get_string_direct(ssh, &blob, &blen)) != 0 ||
|
|
|
|
(r = sshkey_from_blob(blob, blen, &key)) != 0) {
|
|
|
|
error("%s: couldn't parse key: %s",
|
|
|
|
__func__, ssh_err(r));
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Better check that this is actually one of our hostkeys
|
|
|
|
* before attempting to sign anything with it.
|
|
|
|
*/
|
|
|
|
if ((ndx = ssh->kex->host_key_index(key, 1, ssh)) == -1) {
|
|
|
|
error("%s: unknown host %s key",
|
|
|
|
__func__, sshkey_type(key));
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* XXX refactor: make kex->sign just use an index rather
|
|
|
|
* than passing in public and private keys
|
|
|
|
*/
|
|
|
|
if ((key_prv = get_hostkey_by_index(ndx)) == NULL &&
|
|
|
|
(key_pub = get_hostkey_public_by_index(ndx, ssh)) == NULL) {
|
|
|
|
error("%s: can't retrieve hostkey %d", __func__, ndx);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
sshbuf_reset(sigbuf);
|
|
|
|
free(sig);
|
|
|
|
sig = NULL;
|
|
|
|
if ((r = sshbuf_put_cstring(sigbuf,
|
|
|
|
"hostkeys-prove-00@openssh.com")) != 0 ||
|
|
|
|
(r = sshbuf_put_string(sigbuf,
|
|
|
|
ssh->kex->session_id, ssh->kex->session_id_len)) != 0 ||
|
|
|
|
(r = sshkey_puts(key, sigbuf)) != 0 ||
|
|
|
|
(r = ssh->kex->sign(key_prv, key_pub, &sig, &slen,
|
2016-03-10 20:10:25 +00:00
|
|
|
sshbuf_ptr(sigbuf), sshbuf_len(sigbuf), NULL, 0)) != 0 ||
|
2015-07-02 13:15:34 +00:00
|
|
|
(r = sshbuf_put_string(resp, sig, slen)) != 0) {
|
|
|
|
error("%s: couldn't prepare signature: %s",
|
|
|
|
__func__, ssh_err(r));
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* Success */
|
|
|
|
*respp = resp;
|
|
|
|
resp = NULL; /* don't free it */
|
|
|
|
success = 1;
|
|
|
|
out:
|
|
|
|
free(sig);
|
|
|
|
sshbuf_free(resp);
|
|
|
|
sshbuf_free(sigbuf);
|
|
|
|
sshkey_free(key);
|
|
|
|
return success;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
2018-05-06 12:24:45 +00:00
|
|
|
server_input_global_request(int type, u_int32_t seq, struct ssh *ssh)
|
2001-05-04 03:57:05 +00:00
|
|
|
{
|
|
|
|
char *rtype;
|
|
|
|
int want_reply;
|
2015-07-02 13:15:34 +00:00
|
|
|
int r, success = 0, allocated_listen_port = 0;
|
|
|
|
struct sshbuf *resp = NULL;
|
2017-08-03 10:10:20 +00:00
|
|
|
struct passwd *pw = the_authctxt->pw;
|
|
|
|
|
|
|
|
if (pw == NULL || !the_authctxt->valid)
|
|
|
|
fatal("server_input_global_request: no/invalid user");
|
2001-05-04 03:57:05 +00:00
|
|
|
|
|
|
|
rtype = packet_get_string(NULL);
|
|
|
|
want_reply = packet_get_char();
|
|
|
|
debug("server_input_global_request: rtype %s want_reply %d", rtype, want_reply);
|
|
|
|
|
|
|
|
/* -R style forwarding */
|
|
|
|
if (strcmp(rtype, "tcpip-forward") == 0) {
|
2015-01-05 16:09:55 +00:00
|
|
|
struct Forward fwd;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2015-01-05 16:09:55 +00:00
|
|
|
memset(&fwd, 0, sizeof(fwd));
|
|
|
|
fwd.listen_host = packet_get_string(NULL);
|
|
|
|
fwd.listen_port = (u_short)packet_get_int();
|
2001-05-04 03:57:05 +00:00
|
|
|
debug("server_input_global_request: tcpip-forward listen %s port %d",
|
2015-01-05 16:09:55 +00:00
|
|
|
fwd.listen_host, fwd.listen_port);
|
2001-05-04 03:57:05 +00:00
|
|
|
|
|
|
|
/* check permissions */
|
2013-03-22 11:19:48 +00:00
|
|
|
if ((options.allow_tcp_forwarding & FORWARD_REMOTE) == 0 ||
|
2017-01-31 12:33:47 +00:00
|
|
|
no_port_forwarding_flag || options.disable_forwarding ||
|
2017-01-31 12:29:48 +00:00
|
|
|
(!want_reply && fwd.listen_port == 0) ||
|
2017-01-31 12:33:47 +00:00
|
|
|
(fwd.listen_port != 0 &&
|
|
|
|
!bind_permitted(fwd.listen_port, pw->pw_uid))) {
|
2001-05-04 03:57:05 +00:00
|
|
|
success = 0;
|
|
|
|
packet_send_debug("Server has disabled port forwarding.");
|
|
|
|
} else {
|
|
|
|
/* Start listening on the port */
|
2018-05-06 12:24:45 +00:00
|
|
|
success = channel_setup_remote_fwd_listener(ssh, &fwd,
|
2015-01-05 16:09:55 +00:00
|
|
|
&allocated_listen_port, &options.fwd_opts);
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2015-01-05 16:09:55 +00:00
|
|
|
free(fwd.listen_host);
|
2015-07-02 13:15:34 +00:00
|
|
|
if ((resp = sshbuf_new()) == NULL)
|
|
|
|
fatal("%s: sshbuf_new", __func__);
|
2016-03-10 20:10:25 +00:00
|
|
|
if (allocated_listen_port != 0 &&
|
|
|
|
(r = sshbuf_put_u32(resp, allocated_listen_port)) != 0)
|
2015-07-02 13:15:34 +00:00
|
|
|
fatal("%s: sshbuf_put_u32: %s", __func__, ssh_err(r));
|
2004-10-28 16:03:53 +00:00
|
|
|
} else if (strcmp(rtype, "cancel-tcpip-forward") == 0) {
|
2015-01-05 16:09:55 +00:00
|
|
|
struct Forward fwd;
|
2004-10-28 16:03:53 +00:00
|
|
|
|
2015-01-05 16:09:55 +00:00
|
|
|
memset(&fwd, 0, sizeof(fwd));
|
|
|
|
fwd.listen_host = packet_get_string(NULL);
|
|
|
|
fwd.listen_port = (u_short)packet_get_int();
|
2004-10-28 16:03:53 +00:00
|
|
|
debug("%s: cancel-tcpip-forward addr %s port %d", __func__,
|
2015-01-05 16:09:55 +00:00
|
|
|
fwd.listen_host, fwd.listen_port);
|
|
|
|
|
2018-05-06 12:24:45 +00:00
|
|
|
success = channel_cancel_rport_listener(ssh, &fwd);
|
2015-01-05 16:09:55 +00:00
|
|
|
free(fwd.listen_host);
|
|
|
|
} else if (strcmp(rtype, "streamlocal-forward@openssh.com") == 0) {
|
|
|
|
struct Forward fwd;
|
|
|
|
|
|
|
|
memset(&fwd, 0, sizeof(fwd));
|
|
|
|
fwd.listen_path = packet_get_string(NULL);
|
|
|
|
debug("server_input_global_request: streamlocal-forward listen path %s",
|
|
|
|
fwd.listen_path);
|
|
|
|
|
|
|
|
/* check permissions */
|
|
|
|
if ((options.allow_streamlocal_forwarding & FORWARD_REMOTE) == 0
|
2017-01-31 12:33:47 +00:00
|
|
|
|| no_port_forwarding_flag || options.disable_forwarding ||
|
2017-08-03 10:10:20 +00:00
|
|
|
(pw->pw_uid != 0 && !use_privsep)) {
|
2015-01-05 16:09:55 +00:00
|
|
|
success = 0;
|
2017-08-03 10:10:20 +00:00
|
|
|
packet_send_debug("Server has disabled "
|
|
|
|
"streamlocal forwarding.");
|
2015-01-05 16:09:55 +00:00
|
|
|
} else {
|
|
|
|
/* Start listening on the socket */
|
2018-05-06 12:24:45 +00:00
|
|
|
success = channel_setup_remote_fwd_listener(ssh,
|
2015-01-05 16:09:55 +00:00
|
|
|
&fwd, NULL, &options.fwd_opts);
|
|
|
|
}
|
|
|
|
free(fwd.listen_path);
|
|
|
|
} else if (strcmp(rtype, "cancel-streamlocal-forward@openssh.com") == 0) {
|
|
|
|
struct Forward fwd;
|
|
|
|
|
|
|
|
memset(&fwd, 0, sizeof(fwd));
|
|
|
|
fwd.listen_path = packet_get_string(NULL);
|
|
|
|
debug("%s: cancel-streamlocal-forward path %s", __func__,
|
|
|
|
fwd.listen_path);
|
2004-10-28 16:03:53 +00:00
|
|
|
|
2018-05-06 12:24:45 +00:00
|
|
|
success = channel_cancel_rport_listener(ssh, &fwd);
|
2015-01-05 16:09:55 +00:00
|
|
|
free(fwd.listen_path);
|
2008-07-23 09:33:08 +00:00
|
|
|
} else if (strcmp(rtype, "no-more-sessions@openssh.com") == 0) {
|
|
|
|
no_more_sessions = 1;
|
|
|
|
success = 1;
|
2015-07-02 13:15:34 +00:00
|
|
|
} else if (strcmp(rtype, "hostkeys-prove-00@openssh.com") == 0) {
|
2018-05-06 12:24:45 +00:00
|
|
|
success = server_input_hostkeys_prove(ssh, &resp);
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
|
|
|
if (want_reply) {
|
|
|
|
packet_start(success ?
|
|
|
|
SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
|
2015-07-02 13:15:34 +00:00
|
|
|
if (success && resp != NULL)
|
2018-05-06 12:24:45 +00:00
|
|
|
ssh_packet_put_raw(ssh, sshbuf_ptr(resp),
|
2015-07-02 13:15:34 +00:00
|
|
|
sshbuf_len(resp));
|
2001-05-04 03:57:05 +00:00
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
}
|
2013-09-18 17:27:38 +00:00
|
|
|
free(rtype);
|
2015-07-02 13:15:34 +00:00
|
|
|
sshbuf_free(resp);
|
|
|
|
return 0;
|
2001-05-04 03:57:05 +00:00
|
|
|
}
|
2006-09-30 13:29:51 +00:00
|
|
|
|
2015-07-02 13:15:34 +00:00
|
|
|
static int
|
2018-05-06 12:24:45 +00:00
|
|
|
server_input_channel_req(int type, u_int32_t seq, struct ssh *ssh)
|
2002-03-18 09:55:03 +00:00
|
|
|
{
|
|
|
|
Channel *c;
|
|
|
|
int id, reply, success = 0;
|
|
|
|
char *rtype;
|
2001-05-04 03:57:05 +00:00
|
|
|
|
2002-03-18 09:55:03 +00:00
|
|
|
id = packet_get_int();
|
|
|
|
rtype = packet_get_string(NULL);
|
|
|
|
reply = packet_get_char();
|
|
|
|
|
|
|
|
debug("server_input_channel_req: channel %d request %s reply %d",
|
|
|
|
id, rtype, reply);
|
|
|
|
|
2018-05-06 12:24:45 +00:00
|
|
|
if ((c = channel_lookup(ssh, id)) == NULL)
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_disconnect("server_input_channel_req: "
|
|
|
|
"unknown channel %d", id);
|
2008-07-23 09:33:08 +00:00
|
|
|
if (!strcmp(rtype, "eow@openssh.com")) {
|
|
|
|
packet_check_eom();
|
2018-05-06 12:24:45 +00:00
|
|
|
chan_rcvd_eow(ssh, c);
|
2008-07-23 09:33:08 +00:00
|
|
|
} else if ((c->type == SSH_CHANNEL_LARVAL ||
|
|
|
|
c->type == SSH_CHANNEL_OPEN) && strcmp(c->ctype, "session") == 0)
|
2018-05-06 12:24:45 +00:00
|
|
|
success = session_input_channel_req(ssh, c, rtype);
|
2015-01-05 16:09:55 +00:00
|
|
|
if (reply && !(c->flags & CHAN_CLOSE_SENT)) {
|
2018-05-06 12:24:45 +00:00
|
|
|
if (!c->have_remote_id)
|
|
|
|
fatal("%s: channel %d: no remote_id",
|
|
|
|
__func__, c->self);
|
2002-03-18 09:55:03 +00:00
|
|
|
packet_start(success ?
|
|
|
|
SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
|
|
|
|
packet_put_int(c->remote_id);
|
|
|
|
packet_send();
|
|
|
|
}
|
2013-09-18 17:27:38 +00:00
|
|
|
free(rtype);
|
2015-07-02 13:15:34 +00:00
|
|
|
return 0;
|
2002-03-18 09:55:03 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
2017-01-31 12:33:47 +00:00
|
|
|
server_init_dispatch(void)
|
2000-05-15 04:37:24 +00:00
|
|
|
{
|
2017-01-31 12:33:47 +00:00
|
|
|
debug("server_init_dispatch");
|
2000-05-15 04:37:24 +00:00
|
|
|
dispatch_init(&dispatch_protocol_error);
|
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_CLOSE, &channel_input_oclose);
|
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_DATA, &channel_input_data);
|
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_EOF, &channel_input_ieof);
|
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_EXTENDED_DATA, &channel_input_extended_data);
|
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_OPEN, &server_input_channel_open);
|
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, &channel_input_open_confirmation);
|
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_OPEN_FAILURE, &channel_input_open_failure);
|
2002-03-18 09:55:03 +00:00
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_REQUEST, &server_input_channel_req);
|
2000-05-15 04:37:24 +00:00
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_WINDOW_ADJUST, &channel_input_window_adjust);
|
2001-05-04 03:57:05 +00:00
|
|
|
dispatch_set(SSH2_MSG_GLOBAL_REQUEST, &server_input_global_request);
|
|
|
|
/* client_alive */
|
2009-02-24 18:49:27 +00:00
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &server_input_keep_alive);
|
|
|
|
dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &server_input_keep_alive);
|
2004-02-26 10:38:49 +00:00
|
|
|
dispatch_set(SSH2_MSG_REQUEST_SUCCESS, &server_input_keep_alive);
|
|
|
|
dispatch_set(SSH2_MSG_REQUEST_FAILURE, &server_input_keep_alive);
|
2001-05-04 03:57:05 +00:00
|
|
|
/* rekeying */
|
|
|
|
dispatch_set(SSH2_MSG_KEXINIT, &kex_input_kexinit);
|
2000-05-15 04:37:24 +00:00
|
|
|
}
|