2006-10-23 17:01:16 +00:00
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/* $OpenBSD: ssh.c,v 1.294 2006/10/06 02:29:19 djm Exp $ */
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1999-10-27 03:42:43 +00:00
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/*
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1999-11-24 13:26:21 +00:00
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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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* Ssh client program. This program can be used to log into a remote machine.
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* The software supports strong authentication, encryption, and forwarding
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* of X11, TCP/IP, and authentication connections.
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*
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2000-09-16 02:29:08 +00:00
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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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* Copyright (c) 1999 Niels Provos. All rights reserved.
|
2003-10-15 05:54:32 +00:00
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* Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
|
2000-09-16 02:29:08 +00:00
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*
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* Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
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* in Canada (German citizen).
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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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1999-11-24 13:26:21 +00:00
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*/
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1999-10-27 03:42:43 +00:00
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#include "includes.h"
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2006-03-15 00:22:47 +00:00
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2006-03-15 00:45:54 +00:00
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#include <sys/types.h>
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#ifdef HAVE_SYS_STAT_H
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# include <sys/stat.h>
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#endif
|
2006-03-15 00:22:47 +00:00
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#include <sys/resource.h>
|
2006-03-15 00:28:34 +00:00
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#include <sys/ioctl.h>
|
2006-07-10 11:08:03 +00:00
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#include <sys/socket.h>
|
2006-03-15 00:40:10 +00:00
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#include <sys/un.h>
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2006-03-15 00:16:59 +00:00
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2006-03-15 00:53:45 +00:00
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#include <ctype.h>
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2006-07-12 12:24:22 +00:00
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#include <errno.h>
|
2006-07-10 11:13:46 +00:00
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#include <fcntl.h>
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2006-07-24 04:51:00 +00:00
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#include <netdb.h>
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2006-03-15 03:42:54 +00:00
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#ifdef HAVE_PATHS_H
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2006-03-15 00:16:59 +00:00
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#include <paths.h>
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2006-03-15 03:42:54 +00:00
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#endif
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2006-07-10 10:53:08 +00:00
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#include <pwd.h>
|
2006-03-15 00:52:09 +00:00
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#include <signal.h>
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2006-09-01 05:38:36 +00:00
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#include <stdarg.h>
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2006-07-24 03:53:19 +00:00
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#include <stddef.h>
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2006-08-05 01:37:59 +00:00
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#include <stdio.h>
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2006-08-05 01:34:19 +00:00
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#include <stdlib.h>
|
2006-07-24 04:13:33 +00:00
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#include <string.h>
|
2006-07-24 04:01:23 +00:00
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#include <unistd.h>
|
2000-04-29 13:57:08 +00:00
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|
2006-09-02 05:32:40 +00:00
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#include <netinet/in.h>
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#include <arpa/inet.h>
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|
2000-04-29 13:57:08 +00:00
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#include <openssl/evp.h>
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2000-11-13 11:57:25 +00:00
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#include <openssl/err.h>
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1999-10-27 03:42:43 +00:00
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|
2006-08-05 02:39:39 +00:00
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#include "xmalloc.h"
|
1999-10-27 03:42:43 +00:00
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#include "ssh.h"
|
2001-01-22 05:34:40 +00:00
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#include "ssh1.h"
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#include "ssh2.h"
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#include "compat.h"
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#include "cipher.h"
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1999-10-27 03:42:43 +00:00
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#include "packet.h"
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#include "buffer.h"
|
2001-06-09 00:36:26 +00:00
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#include "channels.h"
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2000-04-29 13:57:08 +00:00
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#include "key.h"
|
2000-07-21 00:19:44 +00:00
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#include "authfd.h"
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2000-04-29 13:57:08 +00:00
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#include "authfile.h"
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2001-01-22 05:34:40 +00:00
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#include "pathnames.h"
|
2004-06-15 00:34:08 +00:00
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#include "dispatch.h"
|
2001-01-18 02:04:35 +00:00
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#include "clientloop.h"
|
2001-01-22 05:34:40 +00:00
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#include "log.h"
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#include "readconf.h"
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#include "sshconnect.h"
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#include "misc.h"
|
2001-02-15 03:01:59 +00:00
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#include "kex.h"
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#include "mac.h"
|
2004-05-13 06:06:46 +00:00
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#include "sshpty.h"
|
2004-05-02 12:11:30 +00:00
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#include "match.h"
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2004-06-15 00:34:08 +00:00
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#include "msg.h"
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#include "monitor_fdpass.h"
|
2004-08-15 07:23:34 +00:00
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#include "uidswap.h"
|
2006-07-10 10:23:39 +00:00
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#include "version.h"
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1999-10-27 03:42:43 +00:00
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2001-07-04 04:52:03 +00:00
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#ifdef SMARTCARD
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#include "scard.h"
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2001-08-06 21:59:25 +00:00
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#endif
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2001-07-04 04:52:03 +00:00
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1999-11-15 06:10:57 +00:00
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extern char *__progname;
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1999-11-24 13:26:21 +00:00
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/* Flag indicating whether debug mode is on. This can be set on the command line. */
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1999-10-27 03:42:43 +00:00
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int debug_flag = 0;
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2000-04-12 10:17:38 +00:00
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/* Flag indicating whether a tty should be allocated */
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1999-10-27 03:42:43 +00:00
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int tty_flag = 0;
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2000-12-28 16:40:05 +00:00
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int no_tty_flag = 0;
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int force_tty_flag = 0;
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1999-10-27 03:42:43 +00:00
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2000-04-06 02:32:37 +00:00
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/* don't exec a shell */
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int no_shell_flag = 0;
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1999-11-25 00:54:57 +00:00
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/*
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* Flag indicating that nothing should be read from stdin. This can be set
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* on the command line.
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*/
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1999-10-27 03:42:43 +00:00
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int stdin_null_flag = 0;
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1999-11-25 00:54:57 +00:00
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/*
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* Flag indicating that ssh should fork after authentication. This is useful
|
2002-06-06 19:51:58 +00:00
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* so that the passphrase can be entered manually, and then ssh goes to the
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1999-11-25 00:54:57 +00:00
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* background.
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*/
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1999-10-27 03:42:43 +00:00
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int fork_after_authentication_flag = 0;
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1999-11-25 00:54:57 +00:00
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/*
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* General data structure for command line options and options configurable
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* in configuration files. See readconf.h.
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*/
|
1999-10-27 03:42:43 +00:00
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Options options;
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|
2001-09-12 17:48:04 +00:00
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/* optional user configfile */
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char *config = NULL;
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1999-11-25 00:54:57 +00:00
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/*
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* Name of the host we are connecting to. This is the name given on the
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* command line, or the HostName specified for the user-supplied name in a
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* configuration file.
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*/
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1999-10-27 03:42:43 +00:00
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char *host;
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/* socket address the host resolves to */
|
2000-01-14 04:45:46 +00:00
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struct sockaddr_storage hostaddr;
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1999-10-27 03:42:43 +00:00
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2001-04-12 23:34:34 +00:00
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/* Private host keys. */
|
2002-06-06 19:57:33 +00:00
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Sensitive sensitive_data;
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1999-10-27 03:42:43 +00:00
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/* Original real UID. */
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uid_t original_real_uid;
|
2002-06-11 16:37:51 +00:00
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uid_t original_effective_uid;
|
1999-10-27 03:42:43 +00:00
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2000-04-06 02:32:37 +00:00
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/* command to be executed */
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Buffer command;
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|
2001-01-29 22:30:01 +00:00
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/* Should we execute a command or invoke a subsystem? */
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int subsystem_flag = 0;
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|
2002-04-23 11:09:44 +00:00
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/* # of replies received for global requests */
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static int client_global_request_id = 0;
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|
2002-09-19 02:05:02 +00:00
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/* pid of proxycommand child process */
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pid_t proxy_command_pid = 0;
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|
2004-06-15 00:34:08 +00:00
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/* fd to control socket */
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int control_fd = -1;
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|
2004-11-07 09:06:19 +00:00
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/* Multiplexing control command */
|
2005-06-01 13:08:51 +00:00
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static u_int mux_command = 0;
|
2004-11-07 09:06:19 +00:00
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2004-06-15 00:34:08 +00:00
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/* Only used in control client mode */
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volatile sig_atomic_t control_client_terminate = 0;
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u_int control_server_pid = 0;
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|
1999-10-27 03:42:43 +00:00
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/* Prints a help message to the user. This function never returns. */
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|
2001-06-25 05:01:22 +00:00
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static void
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2001-02-09 02:11:24 +00:00
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usage(void)
|
1999-10-27 03:42:43 +00:00
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{
|
2004-03-21 22:34:58 +00:00
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fprintf(stderr,
|
2004-12-03 03:10:19 +00:00
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"usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
|
2005-10-03 08:18:05 +00:00
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" [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
|
2005-03-02 01:04:32 +00:00
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" [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
|
2005-03-01 10:24:33 +00:00
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" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
|
2005-03-02 01:04:32 +00:00
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" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
|
2006-07-10 10:16:27 +00:00
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" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
|
2004-03-21 22:34:58 +00:00
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);
|
2005-12-20 05:15:51 +00:00
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exit(255);
|
1999-10-27 03:42:43 +00:00
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}
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|
2001-06-25 05:01:22 +00:00
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static int ssh_session(void);
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static int ssh_session2(void);
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static void load_public_identity_files(void);
|
2004-06-15 00:34:08 +00:00
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static void control_client(const char *path);
|
2000-04-06 02:32:37 +00:00
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|
1999-11-24 13:26:21 +00:00
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/*
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* Main program for the ssh client.
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*/
|
1999-10-27 03:42:43 +00:00
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int
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main(int ac, char **av)
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{
|
2002-06-12 16:09:39 +00:00
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int i, opt, exit_status;
|
2003-12-17 05:30:06 +00:00
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char *p, *cp, *line, buf[256];
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1999-11-24 13:26:21 +00:00
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struct stat st;
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2001-03-05 05:56:40 +00:00
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struct passwd *pw;
|
2000-04-06 02:32:37 +00:00
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int dummy;
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2001-09-24 20:00:10 +00:00
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extern int optind, optreset;
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2001-07-14 03:22:53 +00:00
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extern char *optarg;
|
2005-06-25 22:55:25 +00:00
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struct servent *sp;
|
2005-03-01 10:24:33 +00:00
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Forward fwd;
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1999-11-24 13:26:21 +00:00
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|
2005-10-03 08:11:24 +00:00
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/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
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sanitise_stdfd();
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|
2003-08-21 23:34:41 +00:00
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__progname = ssh_get_progname(av[0]);
|
2000-07-09 12:42:32 +00:00
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init_rng();
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|
1999-11-25 00:54:57 +00:00
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/*
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|
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* Save the original real uid. It will be needed later (uid-swapping
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* may clobber the real uid).
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*/
|
1999-11-24 13:26:21 +00:00
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original_real_uid = getuid();
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original_effective_uid = geteuid();
|
2003-11-21 12:48:55 +00:00
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|
2002-09-04 06:50:06 +00:00
|
|
|
/*
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|
|
|
* Use uid-swapping to give up root privileges for the duration of
|
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|
|
* option processing. We will re-instantiate the rights when we are
|
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|
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* ready to create the privileged port, and will permanently drop
|
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* them when the port has been created (actually, when the connection
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* has been made, as we may need to create the port several times).
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*/
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|
PRIV_END;
|
1999-11-24 13:26:21 +00:00
|
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|
2000-09-30 13:42:48 +00:00
|
|
|
#ifdef HAVE_SETRLIMIT
|
1999-11-24 13:26:21 +00:00
|
|
|
/* If we are installed setuid root be careful to not drop core. */
|
|
|
|
if (original_real_uid != original_effective_uid) {
|
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|
|
struct rlimit rlim;
|
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|
|
rlim.rlim_cur = rlim.rlim_max = 0;
|
|
|
|
if (setrlimit(RLIMIT_CORE, &rlim) < 0)
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|
|
fatal("setrlimit failed: %.100s", strerror(errno));
|
1999-10-27 03:42:43 +00:00
|
|
|
}
|
2000-09-05 05:13:06 +00:00
|
|
|
#endif
|
2001-04-08 18:26:59 +00:00
|
|
|
/* Get user data. */
|
|
|
|
pw = getpwuid(original_real_uid);
|
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|
|
if (!pw) {
|
2003-04-09 10:59:48 +00:00
|
|
|
logit("You don't exist, go away!");
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
2001-04-08 18:26:59 +00:00
|
|
|
}
|
|
|
|
/* Take a copy of the returned structure. */
|
|
|
|
pw = pwcopy(pw);
|
|
|
|
|
1999-11-25 00:54:57 +00:00
|
|
|
/*
|
|
|
|
* Set our umask to something reasonable, as some files are created
|
|
|
|
* with the default umask. This will make them world-readable but
|
|
|
|
* writable only by the owner, which is ok for all files for which we
|
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|
|
* don't set the modes explicitly.
|
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|
*/
|
1999-11-24 13:26:21 +00:00
|
|
|
umask(022);
|
|
|
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|
|
|
/* Initialize option structure to indicate that no values have been set. */
|
|
|
|
initialize_options(&options);
|
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|
|
/* Parse command-line arguments. */
|
|
|
|
host = NULL;
|
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|
2006-03-15 01:03:53 +00:00
|
|
|
again:
|
2001-07-14 02:18:10 +00:00
|
|
|
while ((opt = getopt(ac, av,
|
2005-12-13 08:29:02 +00:00
|
|
|
"1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
|
1999-11-24 13:26:21 +00:00
|
|
|
switch (opt) {
|
2001-02-09 02:36:43 +00:00
|
|
|
case '1':
|
|
|
|
options.protocol = SSH_PROTO_1;
|
|
|
|
break;
|
2000-04-16 01:18:38 +00:00
|
|
|
case '2':
|
|
|
|
options.protocol = SSH_PROTO_2;
|
|
|
|
break;
|
2000-01-14 04:45:46 +00:00
|
|
|
case '4':
|
2003-07-03 10:37:47 +00:00
|
|
|
options.address_family = AF_INET;
|
2000-01-14 04:45:46 +00:00
|
|
|
break;
|
|
|
|
case '6':
|
2003-07-03 10:37:47 +00:00
|
|
|
options.address_family = AF_INET6;
|
2000-01-14 04:45:46 +00:00
|
|
|
break;
|
1999-11-24 13:26:21 +00:00
|
|
|
case 'n':
|
|
|
|
stdin_null_flag = 1;
|
|
|
|
break;
|
|
|
|
case 'f':
|
|
|
|
fork_after_authentication_flag = 1;
|
|
|
|
stdin_null_flag = 1;
|
|
|
|
break;
|
|
|
|
case 'x':
|
|
|
|
options.forward_x11 = 0;
|
|
|
|
break;
|
|
|
|
case 'X':
|
|
|
|
options.forward_x11 = 1;
|
|
|
|
break;
|
2003-10-15 05:54:32 +00:00
|
|
|
case 'Y':
|
|
|
|
options.forward_x11 = 1;
|
|
|
|
options.forward_x11_trusted = 1;
|
|
|
|
break;
|
1999-11-24 13:26:21 +00:00
|
|
|
case 'g':
|
|
|
|
options.gateway_ports = 1;
|
|
|
|
break;
|
2004-11-07 09:06:19 +00:00
|
|
|
case 'O':
|
|
|
|
if (strcmp(optarg, "check") == 0)
|
|
|
|
mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
|
|
|
|
else if (strcmp(optarg, "exit") == 0)
|
|
|
|
mux_command = SSHMUX_COMMAND_TERMINATE;
|
|
|
|
else
|
|
|
|
fatal("Invalid multiplex command.");
|
|
|
|
break;
|
2002-09-04 06:46:06 +00:00
|
|
|
case 'P': /* deprecated */
|
1999-11-24 13:26:21 +00:00
|
|
|
options.use_privileged_port = 0;
|
|
|
|
break;
|
|
|
|
case 'a':
|
|
|
|
options.forward_agent = 0;
|
|
|
|
break;
|
2000-05-30 03:44:51 +00:00
|
|
|
case 'A':
|
|
|
|
options.forward_agent = 1;
|
|
|
|
break;
|
1999-11-24 13:26:21 +00:00
|
|
|
case 'k':
|
2003-11-24 02:10:09 +00:00
|
|
|
options.gss_deleg_creds = 0;
|
1999-11-24 13:26:21 +00:00
|
|
|
break;
|
|
|
|
case 'i':
|
|
|
|
if (stat(optarg, &st) < 0) {
|
2001-07-14 02:18:10 +00:00
|
|
|
fprintf(stderr, "Warning: Identity file %s "
|
2005-03-01 10:15:46 +00:00
|
|
|
"not accessible: %s.\n", optarg,
|
|
|
|
strerror(errno));
|
1999-11-24 13:26:21 +00:00
|
|
|
break;
|
|
|
|
}
|
2001-07-14 02:18:10 +00:00
|
|
|
if (options.num_identity_files >=
|
|
|
|
SSH_MAX_IDENTITY_FILES)
|
|
|
|
fatal("Too many identity files specified "
|
|
|
|
"(max %d)", SSH_MAX_IDENTITY_FILES);
|
|
|
|
options.identity_files[options.num_identity_files++] =
|
|
|
|
xstrdup(optarg);
|
1999-11-24 13:26:21 +00:00
|
|
|
break;
|
2001-07-04 04:52:03 +00:00
|
|
|
case 'I':
|
|
|
|
#ifdef SMARTCARD
|
2001-08-06 21:35:51 +00:00
|
|
|
options.smartcard_device = xstrdup(optarg);
|
2001-08-06 21:59:25 +00:00
|
|
|
#else
|
2001-07-04 04:52:03 +00:00
|
|
|
fprintf(stderr, "no support for smartcards.\n");
|
2001-08-06 21:59:25 +00:00
|
|
|
#endif
|
2001-07-04 04:52:03 +00:00
|
|
|
break;
|
1999-11-24 13:26:21 +00:00
|
|
|
case 't':
|
2000-12-28 16:40:05 +00:00
|
|
|
if (tty_flag)
|
|
|
|
force_tty_flag = 1;
|
1999-11-24 13:26:21 +00:00
|
|
|
tty_flag = 1;
|
|
|
|
break;
|
|
|
|
case 'v':
|
2003-07-19 09:54:31 +00:00
|
|
|
if (debug_flag == 0) {
|
2000-09-16 02:29:08 +00:00
|
|
|
debug_flag = 1;
|
|
|
|
options.log_level = SYSLOG_LEVEL_DEBUG1;
|
2003-07-19 09:54:31 +00:00
|
|
|
} else {
|
|
|
|
if (options.log_level < SYSLOG_LEVEL_DEBUG3)
|
|
|
|
options.log_level++;
|
2000-09-16 02:29:08 +00:00
|
|
|
break;
|
2003-07-19 09:54:31 +00:00
|
|
|
}
|
2004-11-05 09:05:32 +00:00
|
|
|
/* FALLTHROUGH */
|
1999-11-24 13:26:21 +00:00
|
|
|
case 'V':
|
2004-03-21 22:36:00 +00:00
|
|
|
fprintf(stderr, "%s, %s\n",
|
2004-09-12 06:53:04 +00:00
|
|
|
SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
|
1999-11-24 13:26:21 +00:00
|
|
|
if (opt == 'V')
|
|
|
|
exit(0);
|
|
|
|
break;
|
2005-12-13 08:29:02 +00:00
|
|
|
case 'w':
|
2005-12-13 08:33:19 +00:00
|
|
|
if (options.tun_open == -1)
|
|
|
|
options.tun_open = SSH_TUNMODE_DEFAULT;
|
2005-12-13 08:29:02 +00:00
|
|
|
options.tun_local = a2tun(optarg, &options.tun_remote);
|
2005-12-13 08:33:19 +00:00
|
|
|
if (options.tun_local == SSH_TUNID_ERR) {
|
2005-12-13 08:29:02 +00:00
|
|
|
fprintf(stderr, "Bad tun device '%s'\n", optarg);
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
2005-12-13 08:29:02 +00:00
|
|
|
}
|
|
|
|
break;
|
1999-11-24 13:26:21 +00:00
|
|
|
case 'q':
|
|
|
|
options.log_level = SYSLOG_LEVEL_QUIET;
|
|
|
|
break;
|
|
|
|
case 'e':
|
|
|
|
if (optarg[0] == '^' && optarg[2] == 0 &&
|
2001-07-14 02:18:10 +00:00
|
|
|
(u_char) optarg[1] >= 64 &&
|
|
|
|
(u_char) optarg[1] < 128)
|
2000-12-22 01:43:59 +00:00
|
|
|
options.escape_char = (u_char) optarg[1] & 31;
|
1999-11-24 13:26:21 +00:00
|
|
|
else if (strlen(optarg) == 1)
|
2000-12-22 01:43:59 +00:00
|
|
|
options.escape_char = (u_char) optarg[0];
|
1999-11-24 13:26:21 +00:00
|
|
|
else if (strcmp(optarg, "none") == 0)
|
2001-06-05 20:32:21 +00:00
|
|
|
options.escape_char = SSH_ESCAPECHAR_NONE;
|
1999-11-24 13:26:21 +00:00
|
|
|
else {
|
2001-07-14 02:18:10 +00:00
|
|
|
fprintf(stderr, "Bad escape character '%s'.\n",
|
|
|
|
optarg);
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
1999-11-24 13:26:21 +00:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
case 'c':
|
2000-04-29 13:57:08 +00:00
|
|
|
if (ciphers_valid(optarg)) {
|
|
|
|
/* SSH2 only */
|
|
|
|
options.ciphers = xstrdup(optarg);
|
2004-08-12 12:40:24 +00:00
|
|
|
options.cipher = SSH_CIPHER_INVALID;
|
2000-04-29 13:57:08 +00:00
|
|
|
} else {
|
|
|
|
/* SSH1 only */
|
2000-11-29 01:18:44 +00:00
|
|
|
options.cipher = cipher_number(optarg);
|
|
|
|
if (options.cipher == -1) {
|
2001-07-14 02:18:10 +00:00
|
|
|
fprintf(stderr,
|
|
|
|
"Unknown cipher type '%s'\n",
|
|
|
|
optarg);
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
2000-04-29 13:57:08 +00:00
|
|
|
}
|
2001-07-14 02:18:10 +00:00
|
|
|
if (options.cipher == SSH_CIPHER_3DES)
|
2000-11-29 01:18:44 +00:00
|
|
|
options.ciphers = "3des-cbc";
|
2001-07-14 02:18:10 +00:00
|
|
|
else if (options.cipher == SSH_CIPHER_BLOWFISH)
|
2000-11-29 01:18:44 +00:00
|
|
|
options.ciphers = "blowfish-cbc";
|
2001-07-14 02:18:10 +00:00
|
|
|
else
|
2000-11-29 01:18:44 +00:00
|
|
|
options.ciphers = (char *)-1;
|
1999-11-24 13:26:21 +00:00
|
|
|
}
|
|
|
|
break;
|
2001-02-15 03:01:59 +00:00
|
|
|
case 'm':
|
|
|
|
if (mac_valid(optarg))
|
|
|
|
options.macs = xstrdup(optarg);
|
|
|
|
else {
|
2001-07-14 02:18:10 +00:00
|
|
|
fprintf(stderr, "Unknown mac type '%s'\n",
|
|
|
|
optarg);
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
2001-02-15 03:01:59 +00:00
|
|
|
}
|
|
|
|
break;
|
2004-06-15 00:34:08 +00:00
|
|
|
case 'M':
|
2005-06-16 03:19:41 +00:00
|
|
|
if (options.control_master == SSHCTL_MASTER_YES)
|
|
|
|
options.control_master = SSHCTL_MASTER_ASK;
|
|
|
|
else
|
|
|
|
options.control_master = SSHCTL_MASTER_YES;
|
2004-06-15 00:34:08 +00:00
|
|
|
break;
|
1999-11-24 13:26:21 +00:00
|
|
|
case 'p':
|
2001-04-12 23:39:26 +00:00
|
|
|
options.port = a2port(optarg);
|
|
|
|
if (options.port == 0) {
|
2001-04-11 23:06:28 +00:00
|
|
|
fprintf(stderr, "Bad port '%s'\n", optarg);
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
2001-04-11 23:06:28 +00:00
|
|
|
}
|
1999-11-24 13:26:21 +00:00
|
|
|
break;
|
|
|
|
case 'l':
|
|
|
|
options.user = optarg;
|
|
|
|
break;
|
2001-09-12 17:56:15 +00:00
|
|
|
|
|
|
|
case 'L':
|
2005-03-01 10:24:33 +00:00
|
|
|
if (parse_forward(&fwd, optarg))
|
|
|
|
add_local_forward(&options, &fwd);
|
|
|
|
else {
|
2001-07-14 02:18:10 +00:00
|
|
|
fprintf(stderr,
|
2005-03-01 10:24:33 +00:00
|
|
|
"Bad local forwarding specification '%s'\n",
|
2001-07-14 02:18:10 +00:00
|
|
|
optarg);
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
1999-11-24 13:26:21 +00:00
|
|
|
}
|
2005-03-01 10:24:33 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case 'R':
|
|
|
|
if (parse_forward(&fwd, optarg)) {
|
|
|
|
add_remote_forward(&options, &fwd);
|
|
|
|
} else {
|
2001-07-14 02:18:10 +00:00
|
|
|
fprintf(stderr,
|
2005-03-01 10:24:33 +00:00
|
|
|
"Bad remote forwarding specification "
|
|
|
|
"'%s'\n", optarg);
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
1999-11-24 13:26:21 +00:00
|
|
|
}
|
|
|
|
break;
|
2001-04-08 18:30:26 +00:00
|
|
|
|
|
|
|
case 'D':
|
2005-03-01 10:24:33 +00:00
|
|
|
cp = p = xstrdup(optarg);
|
|
|
|
memset(&fwd, '\0', sizeof(fwd));
|
|
|
|
fwd.connect_host = "socks";
|
|
|
|
if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
|
|
|
|
fprintf(stderr, "Bad dynamic forwarding "
|
|
|
|
"specification '%.100s'\n", optarg);
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
2005-03-01 10:24:33 +00:00
|
|
|
}
|
|
|
|
if (cp != NULL) {
|
|
|
|
fwd.listen_port = a2port(cp);
|
|
|
|
fwd.listen_host = cleanhostname(fwd.listen_host);
|
|
|
|
} else {
|
|
|
|
fwd.listen_port = a2port(fwd.listen_host);
|
2005-08-12 12:10:56 +00:00
|
|
|
fwd.listen_host = NULL;
|
2005-03-01 10:24:33 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if (fwd.listen_port == 0) {
|
2001-07-14 02:18:10 +00:00
|
|
|
fprintf(stderr, "Bad dynamic port '%s'\n",
|
|
|
|
optarg);
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
2001-04-11 23:06:28 +00:00
|
|
|
}
|
2005-03-01 10:24:33 +00:00
|
|
|
add_local_forward(&options, &fwd);
|
|
|
|
xfree(p);
|
2001-04-08 18:30:26 +00:00
|
|
|
break;
|
|
|
|
|
1999-11-24 13:26:21 +00:00
|
|
|
case 'C':
|
|
|
|
options.compression = 1;
|
|
|
|
break;
|
2000-04-06 02:32:37 +00:00
|
|
|
case 'N':
|
|
|
|
no_shell_flag = 1;
|
|
|
|
no_tty_flag = 1;
|
|
|
|
break;
|
|
|
|
case 'T':
|
|
|
|
no_tty_flag = 1;
|
|
|
|
break;
|
1999-11-24 13:26:21 +00:00
|
|
|
case 'o':
|
|
|
|
dummy = 1;
|
2003-12-17 05:30:06 +00:00
|
|
|
line = xstrdup(optarg);
|
2001-07-14 02:18:10 +00:00
|
|
|
if (process_config_line(&options, host ? host : "",
|
2003-12-17 05:30:06 +00:00
|
|
|
line, "command-line", 0, &dummy) != 0)
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
2003-12-17 05:30:06 +00:00
|
|
|
xfree(line);
|
1999-11-24 13:26:21 +00:00
|
|
|
break;
|
2001-01-29 22:30:01 +00:00
|
|
|
case 's':
|
|
|
|
subsystem_flag = 1;
|
|
|
|
break;
|
2004-06-15 00:34:08 +00:00
|
|
|
case 'S':
|
|
|
|
if (options.control_path != NULL)
|
|
|
|
free(options.control_path);
|
|
|
|
options.control_path = xstrdup(optarg);
|
|
|
|
break;
|
2001-04-30 13:06:24 +00:00
|
|
|
case 'b':
|
|
|
|
options.bind_address = optarg;
|
|
|
|
break;
|
2001-09-12 17:48:04 +00:00
|
|
|
case 'F':
|
|
|
|
config = optarg;
|
|
|
|
break;
|
1999-11-24 13:26:21 +00:00
|
|
|
default:
|
|
|
|
usage();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2001-07-14 02:18:10 +00:00
|
|
|
ac -= optind;
|
|
|
|
av += optind;
|
|
|
|
|
|
|
|
if (ac > 0 && !host && **av != '-') {
|
2002-12-23 02:14:51 +00:00
|
|
|
if (strrchr(*av, '@')) {
|
2001-07-14 02:18:10 +00:00
|
|
|
p = xstrdup(*av);
|
2002-12-23 02:14:51 +00:00
|
|
|
cp = strrchr(p, '@');
|
2001-07-14 02:18:10 +00:00
|
|
|
if (cp == NULL || cp == p)
|
|
|
|
usage();
|
|
|
|
options.user = p;
|
|
|
|
*cp = '\0';
|
|
|
|
host = ++cp;
|
|
|
|
} else
|
|
|
|
host = *av;
|
2002-12-23 02:24:54 +00:00
|
|
|
if (ac > 1) {
|
|
|
|
optind = optreset = 1;
|
2001-07-14 02:18:10 +00:00
|
|
|
goto again;
|
|
|
|
}
|
2002-12-23 02:24:54 +00:00
|
|
|
ac--, av++;
|
2001-07-14 02:18:10 +00:00
|
|
|
}
|
|
|
|
|
1999-11-24 13:26:21 +00:00
|
|
|
/* Check that we got a host name. */
|
|
|
|
if (!host)
|
1999-10-27 03:42:43 +00:00
|
|
|
usage();
|
1999-11-24 13:26:21 +00:00
|
|
|
|
2000-09-29 01:12:36 +00:00
|
|
|
SSLeay_add_all_algorithms();
|
2000-11-13 11:57:25 +00:00
|
|
|
ERR_load_crypto_strings();
|
2000-09-29 01:12:36 +00:00
|
|
|
|
1999-11-24 13:26:21 +00:00
|
|
|
/* Initialize the command to execute on remote host. */
|
|
|
|
buffer_init(&command);
|
|
|
|
|
1999-11-25 00:54:57 +00:00
|
|
|
/*
|
|
|
|
* Save the command to execute on the remote host in a buffer. There
|
|
|
|
* is no limit on the length of the command, except by the maximum
|
|
|
|
* packet size. Also sets the tty flag if there is no command.
|
|
|
|
*/
|
2001-07-14 02:18:10 +00:00
|
|
|
if (!ac) {
|
1999-11-24 13:26:21 +00:00
|
|
|
/* No command specified - execute shell on a tty. */
|
|
|
|
tty_flag = 1;
|
2001-01-29 22:30:01 +00:00
|
|
|
if (subsystem_flag) {
|
2001-07-14 02:18:10 +00:00
|
|
|
fprintf(stderr,
|
|
|
|
"You must specify a subsystem to invoke.\n");
|
2001-01-29 22:30:01 +00:00
|
|
|
usage();
|
|
|
|
}
|
1999-11-24 13:26:21 +00:00
|
|
|
} else {
|
2001-07-14 02:18:10 +00:00
|
|
|
/* A command has been specified. Store it into the buffer. */
|
|
|
|
for (i = 0; i < ac; i++) {
|
|
|
|
if (i)
|
1999-11-24 13:26:21 +00:00
|
|
|
buffer_append(&command, " ", 1);
|
|
|
|
buffer_append(&command, av[i], strlen(av[i]));
|
|
|
|
}
|
1999-10-27 03:42:43 +00:00
|
|
|
}
|
1999-11-24 13:26:21 +00:00
|
|
|
|
|
|
|
/* Cannot fork to background if no command. */
|
2000-08-29 00:33:50 +00:00
|
|
|
if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
|
1999-11-24 13:26:21 +00:00
|
|
|
fatal("Cannot fork into background without a command to execute.");
|
|
|
|
|
|
|
|
/* Allocate a tty by default if no command specified. */
|
|
|
|
if (buffer_len(&command) == 0)
|
|
|
|
tty_flag = 1;
|
|
|
|
|
2002-07-04 00:14:17 +00:00
|
|
|
/* Force no tty */
|
2000-12-02 19:03:54 +00:00
|
|
|
if (no_tty_flag)
|
|
|
|
tty_flag = 0;
|
1999-11-24 13:26:21 +00:00
|
|
|
/* Do not allocate a tty if stdin is not a tty. */
|
2005-05-26 02:05:05 +00:00
|
|
|
if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
|
1999-11-24 13:26:21 +00:00
|
|
|
if (tty_flag)
|
2003-04-09 10:59:48 +00:00
|
|
|
logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
|
1999-11-24 13:26:21 +00:00
|
|
|
tty_flag = 0;
|
|
|
|
}
|
2000-04-06 02:32:37 +00:00
|
|
|
|
2001-03-05 07:24:46 +00:00
|
|
|
/*
|
|
|
|
* Initialize "log" output. Since we are the client all output
|
|
|
|
* actually goes to stderr.
|
|
|
|
*/
|
2001-04-12 16:16:57 +00:00
|
|
|
log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
|
|
|
|
SYSLOG_FACILITY_USER, 1);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
2001-09-12 17:48:04 +00:00
|
|
|
/*
|
|
|
|
* Read per-user configuration file. Ignore the system wide config
|
|
|
|
* file if the user specifies a config file on the command line.
|
|
|
|
*/
|
|
|
|
if (config != NULL) {
|
2004-04-20 10:14:07 +00:00
|
|
|
if (!read_config_file(config, host, &options, 0))
|
2001-09-12 18:32:20 +00:00
|
|
|
fatal("Can't open user config file %.100s: "
|
|
|
|
"%.100s", config, strerror(errno));
|
2001-09-12 17:48:04 +00:00
|
|
|
} else {
|
|
|
|
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
|
|
|
|
_PATH_SSH_USER_CONFFILE);
|
2004-04-20 10:11:57 +00:00
|
|
|
(void)read_config_file(buf, host, &options, 1);
|
2001-09-12 17:48:04 +00:00
|
|
|
|
2001-10-03 17:22:29 +00:00
|
|
|
/* Read systemwide configuration file after use config. */
|
2004-07-17 06:12:08 +00:00
|
|
|
(void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
|
2004-04-20 10:11:57 +00:00
|
|
|
&options, 0);
|
2001-09-12 17:48:04 +00:00
|
|
|
}
|
1999-11-24 13:26:21 +00:00
|
|
|
|
|
|
|
/* Fill configuration defaults. */
|
|
|
|
fill_default_options(&options);
|
|
|
|
|
2003-07-03 10:37:47 +00:00
|
|
|
channel_set_af(options.address_family);
|
|
|
|
|
1999-11-24 13:26:21 +00:00
|
|
|
/* reinit */
|
2001-03-05 07:24:46 +00:00
|
|
|
log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
2001-03-18 22:38:15 +00:00
|
|
|
seed_rng();
|
|
|
|
|
1999-11-24 13:26:21 +00:00
|
|
|
if (options.user == NULL)
|
|
|
|
options.user = xstrdup(pw->pw_name);
|
|
|
|
|
|
|
|
if (options.hostname != NULL)
|
|
|
|
host = options.hostname;
|
|
|
|
|
2003-07-03 06:20:42 +00:00
|
|
|
/* force lowercase for hostkey matching */
|
|
|
|
if (options.host_key_alias != NULL) {
|
|
|
|
for (p = options.host_key_alias; *p; p++)
|
|
|
|
if (isupper(*p))
|
2006-03-26 03:09:54 +00:00
|
|
|
*p = (char)tolower(*p);
|
2003-07-03 06:20:42 +00:00
|
|
|
}
|
|
|
|
|
2005-06-25 22:56:31 +00:00
|
|
|
/* Get default port if port has not been set. */
|
|
|
|
if (options.port == 0) {
|
|
|
|
sp = getservbyname(SSH_SERVICE_NAME, "tcp");
|
|
|
|
options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
|
|
|
|
}
|
|
|
|
|
2003-02-24 00:57:32 +00:00
|
|
|
if (options.proxy_command != NULL &&
|
|
|
|
strcmp(options.proxy_command, "none") == 0)
|
|
|
|
options.proxy_command = NULL;
|
2005-06-25 22:56:03 +00:00
|
|
|
if (options.control_path != NULL &&
|
|
|
|
strcmp(options.control_path, "none") == 0)
|
|
|
|
options.control_path = NULL;
|
2003-02-24 00:57:32 +00:00
|
|
|
|
2004-06-15 00:34:08 +00:00
|
|
|
if (options.control_path != NULL) {
|
2006-03-31 12:13:21 +00:00
|
|
|
char thishost[NI_MAXHOST];
|
2006-03-15 00:30:13 +00:00
|
|
|
|
2006-03-31 12:13:21 +00:00
|
|
|
if (gethostname(thishost, sizeof(thishost)) == -1)
|
2006-03-15 00:30:13 +00:00
|
|
|
fatal("gethostname: %s", strerror(errno));
|
2005-06-16 03:18:34 +00:00
|
|
|
snprintf(buf, sizeof(buf), "%d", options.port);
|
|
|
|
cp = tilde_expand_filename(options.control_path,
|
|
|
|
original_real_uid);
|
|
|
|
options.control_path = percent_expand(cp, "p", buf, "h", host,
|
2006-03-31 12:13:21 +00:00
|
|
|
"r", options.user, "l", thishost, (char *)NULL);
|
2005-06-16 03:18:34 +00:00
|
|
|
xfree(cp);
|
2004-06-15 00:34:08 +00:00
|
|
|
}
|
2005-06-01 13:08:51 +00:00
|
|
|
if (mux_command != 0 && options.control_path == NULL)
|
|
|
|
fatal("No ControlPath specified for \"-O\" command");
|
2005-06-16 03:19:41 +00:00
|
|
|
if (options.control_path != NULL)
|
2005-05-26 02:07:13 +00:00
|
|
|
control_client(options.control_path);
|
2004-06-15 00:34:08 +00:00
|
|
|
|
2000-12-15 19:55:48 +00:00
|
|
|
/* Open a connection to the remote host. */
|
2003-07-03 10:37:47 +00:00
|
|
|
if (ssh_connect(host, &hostaddr, options.port,
|
|
|
|
options.address_family, options.connection_attempts,
|
2002-06-11 20:28:05 +00:00
|
|
|
#ifdef HAVE_CYGWIN
|
|
|
|
options.use_privileged_port,
|
|
|
|
#else
|
2002-06-11 16:37:51 +00:00
|
|
|
original_effective_uid == 0 && options.use_privileged_port,
|
2002-06-11 20:28:05 +00:00
|
|
|
#endif
|
2002-06-12 16:11:12 +00:00
|
|
|
options.proxy_command) != 0)
|
2005-12-20 05:15:51 +00:00
|
|
|
exit(255);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
1999-11-25 00:54:57 +00:00
|
|
|
/*
|
|
|
|
* If we successfully made the connection, load the host private key
|
|
|
|
* in case we will need it later for combined rsa-rhosts
|
|
|
|
* authentication. This must be done before releasing extra
|
|
|
|
* privileges, because the file is only readable by root.
|
2002-06-06 19:58:27 +00:00
|
|
|
* If we cannot access the private keys, load the public keys
|
|
|
|
* instead and try to execute the ssh-keysign helper instead.
|
1999-11-25 00:54:57 +00:00
|
|
|
*/
|
2001-04-12 23:34:34 +00:00
|
|
|
sensitive_data.nkeys = 0;
|
|
|
|
sensitive_data.keys = NULL;
|
2002-06-06 19:57:33 +00:00
|
|
|
sensitive_data.external_keysign = 0;
|
2002-06-12 16:09:39 +00:00
|
|
|
if (options.rhosts_rsa_authentication ||
|
|
|
|
options.hostbased_authentication) {
|
2001-04-12 23:34:34 +00:00
|
|
|
sensitive_data.nkeys = 3;
|
2006-03-31 12:10:51 +00:00
|
|
|
sensitive_data.keys = xcalloc(sensitive_data.nkeys,
|
2002-07-04 00:14:17 +00:00
|
|
|
sizeof(Key));
|
2002-06-11 16:37:51 +00:00
|
|
|
|
|
|
|
PRIV_START;
|
2001-04-12 23:34:34 +00:00
|
|
|
sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
|
2006-05-06 07:41:51 +00:00
|
|
|
_PATH_HOST_KEY_FILE, "", NULL, NULL);
|
2001-04-12 23:34:34 +00:00
|
|
|
sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
|
2006-05-06 07:41:51 +00:00
|
|
|
_PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
|
2001-04-12 23:34:34 +00:00
|
|
|
sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
|
2006-05-06 07:41:51 +00:00
|
|
|
_PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
|
2002-06-11 16:37:51 +00:00
|
|
|
PRIV_END;
|
2002-06-06 19:57:33 +00:00
|
|
|
|
2002-07-04 00:19:40 +00:00
|
|
|
if (options.hostbased_authentication == 1 &&
|
|
|
|
sensitive_data.keys[0] == NULL &&
|
2002-06-06 19:57:33 +00:00
|
|
|
sensitive_data.keys[1] == NULL &&
|
|
|
|
sensitive_data.keys[2] == NULL) {
|
|
|
|
sensitive_data.keys[1] = key_load_public(
|
|
|
|
_PATH_HOST_DSA_KEY_FILE, NULL);
|
|
|
|
sensitive_data.keys[2] = key_load_public(
|
|
|
|
_PATH_HOST_RSA_KEY_FILE, NULL);
|
|
|
|
sensitive_data.external_keysign = 1;
|
|
|
|
}
|
1999-11-24 13:26:21 +00:00
|
|
|
}
|
1999-11-25 00:54:57 +00:00
|
|
|
/*
|
|
|
|
* Get rid of any extra privileges that we may have. We will no
|
|
|
|
* longer need them. Also, extra privileges could make it very hard
|
|
|
|
* to read identity files and other non-world-readable files from the
|
|
|
|
* user's home directory if it happens to be on a NFS volume where
|
|
|
|
* root is mapped to nobody.
|
|
|
|
*/
|
2004-08-15 07:23:34 +00:00
|
|
|
if (original_effective_uid == 0) {
|
|
|
|
PRIV_START;
|
|
|
|
permanently_set_uid(pw);
|
|
|
|
}
|
1999-11-24 13:26:21 +00:00
|
|
|
|
1999-11-25 00:54:57 +00:00
|
|
|
/*
|
|
|
|
* Now that we are back to our own permissions, create ~/.ssh
|
2005-11-05 04:14:59 +00:00
|
|
|
* directory if it doesn't already exist.
|
1999-11-25 00:54:57 +00:00
|
|
|
*/
|
2001-08-15 23:19:21 +00:00
|
|
|
snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
|
1999-11-24 13:26:21 +00:00
|
|
|
if (stat(buf, &st) < 0)
|
2000-07-15 04:14:16 +00:00
|
|
|
if (mkdir(buf, 0700) < 0)
|
1999-11-24 13:26:21 +00:00
|
|
|
error("Could not create directory '%.200s'.", buf);
|
|
|
|
|
2001-03-09 00:12:22 +00:00
|
|
|
/* load options.identity_files */
|
|
|
|
load_public_identity_files();
|
|
|
|
|
|
|
|
/* Expand ~ in known host file names. */
|
|
|
|
/* XXX mem-leaks: */
|
2000-11-13 11:57:25 +00:00
|
|
|
options.system_hostfile =
|
|
|
|
tilde_expand_filename(options.system_hostfile, original_real_uid);
|
|
|
|
options.user_hostfile =
|
|
|
|
tilde_expand_filename(options.user_hostfile, original_real_uid);
|
|
|
|
options.system_hostfile2 =
|
|
|
|
tilde_expand_filename(options.system_hostfile2, original_real_uid);
|
|
|
|
options.user_hostfile2 =
|
|
|
|
tilde_expand_filename(options.user_hostfile2, original_real_uid);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
2001-11-11 23:52:03 +00:00
|
|
|
signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
|
|
|
|
|
1999-11-24 13:26:21 +00:00
|
|
|
/* Log into the remote system. This never returns if the login fails. */
|
2002-06-06 19:57:33 +00:00
|
|
|
ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
|
2001-04-12 23:34:34 +00:00
|
|
|
|
|
|
|
/* We no longer need the private host keys. Clear them now. */
|
|
|
|
if (sensitive_data.nkeys != 0) {
|
|
|
|
for (i = 0; i < sensitive_data.nkeys; i++) {
|
|
|
|
if (sensitive_data.keys[i] != NULL) {
|
|
|
|
/* Destroys contents safely */
|
|
|
|
debug3("clear hostkey %d", i);
|
|
|
|
key_free(sensitive_data.keys[i]);
|
|
|
|
sensitive_data.keys[i] = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
xfree(sensitive_data.keys);
|
|
|
|
}
|
2001-08-06 21:42:00 +00:00
|
|
|
for (i = 0; i < options.num_identity_files; i++) {
|
|
|
|
if (options.identity_files[i]) {
|
|
|
|
xfree(options.identity_files[i]);
|
|
|
|
options.identity_files[i] = NULL;
|
|
|
|
}
|
|
|
|
if (options.identity_keys[i]) {
|
|
|
|
key_free(options.identity_keys[i]);
|
|
|
|
options.identity_keys[i] = NULL;
|
|
|
|
}
|
|
|
|
}
|
1999-11-24 13:26:21 +00:00
|
|
|
|
2000-04-06 02:32:37 +00:00
|
|
|
exit_status = compat20 ? ssh_session2() : ssh_session();
|
|
|
|
packet_close();
|
2002-09-19 02:05:02 +00:00
|
|
|
|
2004-06-15 00:34:08 +00:00
|
|
|
if (options.control_path != NULL && control_fd != -1)
|
|
|
|
unlink(options.control_path);
|
|
|
|
|
2002-09-19 02:05:02 +00:00
|
|
|
/*
|
2003-11-21 12:48:55 +00:00
|
|
|
* Send SIGHUP to proxy command if used. We don't wait() in
|
2002-09-19 02:05:02 +00:00
|
|
|
* case it hangs and instead rely on init to reap the child
|
|
|
|
*/
|
|
|
|
if (proxy_command_pid > 1)
|
|
|
|
kill(proxy_command_pid, SIGHUP);
|
|
|
|
|
2000-04-06 02:32:37 +00:00
|
|
|
return exit_status;
|
|
|
|
}
|
|
|
|
|
2001-06-25 05:01:22 +00:00
|
|
|
static void
|
2000-11-13 11:57:25 +00:00
|
|
|
ssh_init_forwarding(void)
|
|
|
|
{
|
2001-02-05 14:54:34 +00:00
|
|
|
int success = 0;
|
2000-11-13 11:57:25 +00:00
|
|
|
int i;
|
2001-02-05 14:54:34 +00:00
|
|
|
|
2000-11-13 11:57:25 +00:00
|
|
|
/* Initiate local TCP/IP port forwardings. */
|
|
|
|
for (i = 0; i < options.num_local_forwards; i++) {
|
2005-03-01 10:24:33 +00:00
|
|
|
debug("Local connections to %.200s:%d forwarded to remote "
|
|
|
|
"address %.200s:%d",
|
2005-03-14 12:08:12 +00:00
|
|
|
(options.local_forwards[i].listen_host == NULL) ?
|
|
|
|
(options.gateway_ports ? "*" : "LOCALHOST") :
|
2005-03-01 10:24:33 +00:00
|
|
|
options.local_forwards[i].listen_host,
|
|
|
|
options.local_forwards[i].listen_port,
|
|
|
|
options.local_forwards[i].connect_host,
|
|
|
|
options.local_forwards[i].connect_port);
|
2002-01-22 12:29:22 +00:00
|
|
|
success += channel_setup_local_fwd_listener(
|
2005-03-01 10:24:33 +00:00
|
|
|
options.local_forwards[i].listen_host,
|
|
|
|
options.local_forwards[i].listen_port,
|
|
|
|
options.local_forwards[i].connect_host,
|
|
|
|
options.local_forwards[i].connect_port,
|
2000-11-13 11:57:25 +00:00
|
|
|
options.gateway_ports);
|
|
|
|
}
|
2006-07-12 12:17:10 +00:00
|
|
|
if (i > 0 && success != i && options.exit_on_forward_failure)
|
|
|
|
fatal("Could not request local forwarding.");
|
2001-02-05 14:54:34 +00:00
|
|
|
if (i > 0 && success == 0)
|
|
|
|
error("Could not request local forwarding.");
|
2000-11-13 11:57:25 +00:00
|
|
|
|
|
|
|
/* Initiate remote TCP/IP port forwardings. */
|
|
|
|
for (i = 0; i < options.num_remote_forwards; i++) {
|
2005-03-01 10:24:33 +00:00
|
|
|
debug("Remote connections from %.200s:%d forwarded to "
|
|
|
|
"local address %.200s:%d",
|
2005-07-17 07:02:09 +00:00
|
|
|
(options.remote_forwards[i].listen_host == NULL) ?
|
2005-11-05 04:12:59 +00:00
|
|
|
"LOCALHOST" : options.remote_forwards[i].listen_host,
|
2005-03-01 10:24:33 +00:00
|
|
|
options.remote_forwards[i].listen_port,
|
|
|
|
options.remote_forwards[i].connect_host,
|
|
|
|
options.remote_forwards[i].connect_port);
|
2006-07-12 12:17:10 +00:00
|
|
|
if (channel_request_remote_forwarding(
|
2005-03-01 10:24:33 +00:00
|
|
|
options.remote_forwards[i].listen_host,
|
|
|
|
options.remote_forwards[i].listen_port,
|
|
|
|
options.remote_forwards[i].connect_host,
|
2006-07-12 12:17:10 +00:00
|
|
|
options.remote_forwards[i].connect_port) < 0) {
|
|
|
|
if (options.exit_on_forward_failure)
|
|
|
|
fatal("Could not request remote forwarding.");
|
|
|
|
else
|
|
|
|
logit("Warning: Could not request remote "
|
|
|
|
"forwarding.");
|
|
|
|
}
|
2000-11-13 11:57:25 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2001-06-25 05:01:22 +00:00
|
|
|
static void
|
2000-11-13 11:57:25 +00:00
|
|
|
check_agent_present(void)
|
|
|
|
{
|
|
|
|
if (options.forward_agent) {
|
2005-11-05 04:14:59 +00:00
|
|
|
/* Clear agent forwarding if we don't have an agent. */
|
2002-09-11 23:52:46 +00:00
|
|
|
if (!ssh_agent_present())
|
2000-11-13 11:57:25 +00:00
|
|
|
options.forward_agent = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2001-06-25 05:01:22 +00:00
|
|
|
static int
|
2000-04-06 02:32:37 +00:00
|
|
|
ssh_session(void)
|
|
|
|
{
|
|
|
|
int type;
|
|
|
|
int interactive = 0;
|
|
|
|
int have_tty = 0;
|
|
|
|
struct winsize ws;
|
|
|
|
char *cp;
|
2005-06-17 02:54:33 +00:00
|
|
|
const char *display;
|
2000-04-06 02:32:37 +00:00
|
|
|
|
1999-11-24 13:26:21 +00:00
|
|
|
/* Enable compression if requested. */
|
|
|
|
if (options.compression) {
|
|
|
|
debug("Requesting compression at level %d.", options.compression_level);
|
|
|
|
|
|
|
|
if (options.compression_level < 1 || options.compression_level > 9)
|
|
|
|
fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
|
|
|
|
|
|
|
|
/* Send the request. */
|
|
|
|
packet_start(SSH_CMSG_REQUEST_COMPRESSION);
|
|
|
|
packet_put_int(options.compression_level);
|
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
2002-01-22 12:16:32 +00:00
|
|
|
type = packet_read();
|
1999-11-24 13:26:21 +00:00
|
|
|
if (type == SSH_SMSG_SUCCESS)
|
|
|
|
packet_start_compression(options.compression_level);
|
|
|
|
else if (type == SSH_SMSG_FAILURE)
|
2003-04-09 10:59:48 +00:00
|
|
|
logit("Warning: Remote host refused compression.");
|
1999-11-24 13:26:21 +00:00
|
|
|
else
|
|
|
|
packet_disconnect("Protocol error waiting for compression response.");
|
|
|
|
}
|
|
|
|
/* Allocate a pseudo tty if appropriate. */
|
|
|
|
if (tty_flag) {
|
|
|
|
debug("Requesting pty.");
|
|
|
|
|
|
|
|
/* Start the packet. */
|
|
|
|
packet_start(SSH_CMSG_REQUEST_PTY);
|
|
|
|
|
|
|
|
/* Store TERM in the packet. There is no limit on the
|
|
|
|
length of the string. */
|
|
|
|
cp = getenv("TERM");
|
|
|
|
if (!cp)
|
|
|
|
cp = "";
|
2001-06-09 01:42:01 +00:00
|
|
|
packet_put_cstring(cp);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
|
|
|
/* Store window size in the packet. */
|
|
|
|
if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
|
|
|
|
memset(&ws, 0, sizeof(ws));
|
2006-03-26 03:04:36 +00:00
|
|
|
packet_put_int((u_int)ws.ws_row);
|
|
|
|
packet_put_int((u_int)ws.ws_col);
|
|
|
|
packet_put_int((u_int)ws.ws_xpixel);
|
|
|
|
packet_put_int((u_int)ws.ws_ypixel);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
|
|
|
/* Store tty modes in the packet. */
|
2001-04-14 23:13:02 +00:00
|
|
|
tty_make_modes(fileno(stdin), NULL);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
|
|
|
/* Send the packet, and wait for it to leave. */
|
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
|
|
|
|
/* Read response from the server. */
|
2002-01-22 12:16:32 +00:00
|
|
|
type = packet_read();
|
2000-03-26 03:04:51 +00:00
|
|
|
if (type == SSH_SMSG_SUCCESS) {
|
1999-11-24 13:26:21 +00:00
|
|
|
interactive = 1;
|
2000-04-06 02:32:37 +00:00
|
|
|
have_tty = 1;
|
2000-03-26 03:04:51 +00:00
|
|
|
} else if (type == SSH_SMSG_FAILURE)
|
2003-04-09 10:59:48 +00:00
|
|
|
logit("Warning: Remote host failed or refused to allocate a pseudo tty.");
|
1999-11-24 13:26:21 +00:00
|
|
|
else
|
|
|
|
packet_disconnect("Protocol error waiting for pty request response.");
|
|
|
|
}
|
|
|
|
/* Request X11 forwarding if enabled and DISPLAY is set. */
|
2005-06-17 02:54:33 +00:00
|
|
|
display = getenv("DISPLAY");
|
|
|
|
if (options.forward_x11 && display != NULL) {
|
2001-12-06 17:45:19 +00:00
|
|
|
char *proto, *data;
|
2000-04-30 00:00:53 +00:00
|
|
|
/* Get reasonable local authentication information. */
|
2005-06-17 02:54:33 +00:00
|
|
|
client_x11_get_proto(display, options.xauth_location,
|
|
|
|
options.forward_x11_trusted, &proto, &data);
|
2000-04-30 00:00:53 +00:00
|
|
|
/* Request forwarding with authentication spoofing. */
|
1999-11-24 13:26:21 +00:00
|
|
|
debug("Requesting X11 forwarding with authentication spoofing.");
|
2005-06-17 02:54:33 +00:00
|
|
|
x11_request_forwarding_with_spoofing(0, display, proto, data);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
|
|
|
/* Read response from the server. */
|
2002-01-22 12:16:32 +00:00
|
|
|
type = packet_read();
|
1999-11-24 13:26:21 +00:00
|
|
|
if (type == SSH_SMSG_SUCCESS) {
|
|
|
|
interactive = 1;
|
2000-04-30 00:00:53 +00:00
|
|
|
} else if (type == SSH_SMSG_FAILURE) {
|
2003-04-09 10:59:48 +00:00
|
|
|
logit("Warning: Remote host denied X11 forwarding.");
|
2000-04-30 00:00:53 +00:00
|
|
|
} else {
|
1999-11-24 13:26:21 +00:00
|
|
|
packet_disconnect("Protocol error waiting for X11 forwarding");
|
2000-04-30 00:00:53 +00:00
|
|
|
}
|
1999-11-24 13:26:21 +00:00
|
|
|
}
|
|
|
|
/* Tell the packet module whether this is an interactive session. */
|
2001-01-18 02:04:35 +00:00
|
|
|
packet_set_interactive(interactive);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
|
|
|
/* Request authentication agent forwarding if appropriate. */
|
2000-11-13 11:57:25 +00:00
|
|
|
check_agent_present();
|
|
|
|
|
1999-11-24 13:26:21 +00:00
|
|
|
if (options.forward_agent) {
|
|
|
|
debug("Requesting authentication agent forwarding.");
|
|
|
|
auth_request_forwarding();
|
|
|
|
|
|
|
|
/* Read response from the server. */
|
2002-01-22 12:16:32 +00:00
|
|
|
type = packet_read();
|
2002-01-22 12:11:40 +00:00
|
|
|
packet_check_eom();
|
1999-11-24 13:26:21 +00:00
|
|
|
if (type != SSH_SMSG_SUCCESS)
|
2003-04-09 10:59:48 +00:00
|
|
|
logit("Warning: Remote host denied authentication agent forwarding.");
|
1999-11-24 13:26:21 +00:00
|
|
|
}
|
1999-10-27 03:42:43 +00:00
|
|
|
|
2000-11-13 11:57:25 +00:00
|
|
|
/* Initiate port forwardings. */
|
|
|
|
ssh_init_forwarding();
|
1999-11-24 13:26:21 +00:00
|
|
|
|
1999-11-25 00:54:57 +00:00
|
|
|
/* If requested, let ssh continue in the background. */
|
2000-04-16 01:18:38 +00:00
|
|
|
if (fork_after_authentication_flag)
|
1999-11-25 00:54:57 +00:00
|
|
|
if (daemon(1, 1) < 0)
|
|
|
|
fatal("daemon() failed: %.200s", strerror(errno));
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If a command was specified on the command line, execute the
|
|
|
|
* command now. Otherwise request the server to start a shell.
|
|
|
|
*/
|
1999-11-24 13:26:21 +00:00
|
|
|
if (buffer_len(&command) > 0) {
|
|
|
|
int len = buffer_len(&command);
|
|
|
|
if (len > 900)
|
|
|
|
len = 900;
|
2001-12-21 03:56:54 +00:00
|
|
|
debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
|
1999-11-24 13:26:21 +00:00
|
|
|
packet_start(SSH_CMSG_EXEC_CMD);
|
|
|
|
packet_put_string(buffer_ptr(&command), buffer_len(&command));
|
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
} else {
|
|
|
|
debug("Requesting shell.");
|
|
|
|
packet_start(SSH_CMSG_EXEC_SHELL);
|
|
|
|
packet_send();
|
|
|
|
packet_write_wait();
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Enter the interactive session. */
|
2001-06-05 20:32:21 +00:00
|
|
|
return client_loop(have_tty, tty_flag ?
|
|
|
|
options.escape_char : SSH_ESCAPECHAR_NONE, 0);
|
2000-04-06 02:32:37 +00:00
|
|
|
}
|
1999-11-24 13:26:21 +00:00
|
|
|
|
2001-06-25 05:01:22 +00:00
|
|
|
static void
|
2004-06-15 00:34:08 +00:00
|
|
|
ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
|
2001-02-09 02:36:43 +00:00
|
|
|
{
|
|
|
|
int id, len;
|
|
|
|
|
|
|
|
id = packet_get_int();
|
|
|
|
len = buffer_len(&command);
|
2001-03-05 06:52:57 +00:00
|
|
|
if (len > 900)
|
|
|
|
len = 900;
|
2002-01-22 12:11:40 +00:00
|
|
|
packet_check_eom();
|
2001-02-09 02:36:43 +00:00
|
|
|
if (type == SSH2_MSG_CHANNEL_FAILURE)
|
|
|
|
fatal("Request for subsystem '%.*s' failed on channel %d",
|
2001-12-21 03:56:54 +00:00
|
|
|
len, (u_char *)buffer_ptr(&command), id);
|
2001-02-09 02:36:43 +00:00
|
|
|
}
|
|
|
|
|
2002-04-23 11:09:44 +00:00
|
|
|
void
|
2003-12-17 05:33:10 +00:00
|
|
|
client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
|
2002-04-23 11:09:44 +00:00
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
i = client_global_request_id++;
|
2003-12-17 05:33:10 +00:00
|
|
|
if (i >= options.num_remote_forwards)
|
2002-04-23 11:09:44 +00:00
|
|
|
return;
|
|
|
|
debug("remote forward %s for: listen %d, connect %s:%d",
|
|
|
|
type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
|
2005-03-01 10:24:33 +00:00
|
|
|
options.remote_forwards[i].listen_port,
|
|
|
|
options.remote_forwards[i].connect_host,
|
|
|
|
options.remote_forwards[i].connect_port);
|
2006-07-12 12:17:10 +00:00
|
|
|
if (type == SSH2_MSG_REQUEST_FAILURE) {
|
|
|
|
if (options.exit_on_forward_failure)
|
|
|
|
fatal("Error: remote port forwarding failed for "
|
|
|
|
"listen port %d",
|
|
|
|
options.remote_forwards[i].listen_port);
|
|
|
|
else
|
|
|
|
logit("Warning: remote port forwarding failed for "
|
|
|
|
"listen port %d",
|
|
|
|
options.remote_forwards[i].listen_port);
|
|
|
|
}
|
2002-04-23 11:09:44 +00:00
|
|
|
}
|
|
|
|
|
2001-06-25 05:01:22 +00:00
|
|
|
static void
|
2004-06-15 00:34:08 +00:00
|
|
|
ssh_control_listener(void)
|
2000-04-06 02:32:37 +00:00
|
|
|
{
|
2004-06-15 00:34:08 +00:00
|
|
|
struct sockaddr_un addr;
|
|
|
|
mode_t old_umask;
|
2004-06-15 01:14:45 +00:00
|
|
|
int addr_len;
|
|
|
|
|
2005-06-16 03:19:41 +00:00
|
|
|
if (options.control_path == NULL ||
|
|
|
|
options.control_master == SSHCTL_MASTER_NO)
|
2004-06-15 00:34:08 +00:00
|
|
|
return;
|
2001-01-18 02:04:35 +00:00
|
|
|
|
2005-06-16 03:19:41 +00:00
|
|
|
debug("setting up multiplex master socket");
|
|
|
|
|
2004-06-15 00:34:08 +00:00
|
|
|
memset(&addr, '\0', sizeof(addr));
|
|
|
|
addr.sun_family = AF_UNIX;
|
2004-06-15 01:14:45 +00:00
|
|
|
addr_len = offsetof(struct sockaddr_un, sun_path) +
|
2004-06-15 00:34:08 +00:00
|
|
|
strlen(options.control_path) + 1;
|
2000-04-06 02:32:37 +00:00
|
|
|
|
2004-06-15 00:34:08 +00:00
|
|
|
if (strlcpy(addr.sun_path, options.control_path,
|
|
|
|
sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
|
|
|
|
fatal("ControlPath too long");
|
2000-04-06 02:32:37 +00:00
|
|
|
|
2004-06-15 00:34:08 +00:00
|
|
|
if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
|
2005-11-05 04:07:33 +00:00
|
|
|
fatal("%s socket(): %s", __func__, strerror(errno));
|
2004-06-15 00:34:08 +00:00
|
|
|
|
|
|
|
old_umask = umask(0177);
|
2006-03-26 03:07:26 +00:00
|
|
|
if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) {
|
2004-06-15 00:34:08 +00:00
|
|
|
control_fd = -1;
|
2005-05-04 05:33:09 +00:00
|
|
|
if (errno == EINVAL || errno == EADDRINUSE)
|
2004-06-15 00:34:08 +00:00
|
|
|
fatal("ControlSocket %s already exists",
|
|
|
|
options.control_path);
|
|
|
|
else
|
2005-11-05 04:07:33 +00:00
|
|
|
fatal("%s bind(): %s", __func__, strerror(errno));
|
2000-04-06 02:32:37 +00:00
|
|
|
}
|
2004-06-15 00:34:08 +00:00
|
|
|
umask(old_umask);
|
|
|
|
|
|
|
|
if (listen(control_fd, 64) == -1)
|
2005-11-05 04:07:33 +00:00
|
|
|
fatal("%s listen(): %s", __func__, strerror(errno));
|
2004-06-15 00:34:08 +00:00
|
|
|
|
|
|
|
set_nonblock(control_fd);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* request pty/x11/agent/tcpfwd/shell for channel */
|
|
|
|
static void
|
|
|
|
ssh_session2_setup(int id, void *arg)
|
|
|
|
{
|
2004-06-17 15:17:29 +00:00
|
|
|
extern char **environ;
|
2005-06-17 02:54:33 +00:00
|
|
|
const char *display;
|
2004-06-15 00:34:08 +00:00
|
|
|
int interactive = tty_flag;
|
2005-06-17 02:54:33 +00:00
|
|
|
|
2005-07-17 07:02:09 +00:00
|
|
|
display = getenv("DISPLAY");
|
2005-06-17 02:54:33 +00:00
|
|
|
if (options.forward_x11 && display != NULL) {
|
2001-12-06 17:45:19 +00:00
|
|
|
char *proto, *data;
|
2000-04-30 00:00:53 +00:00
|
|
|
/* Get reasonable local authentication information. */
|
2005-06-17 02:54:33 +00:00
|
|
|
client_x11_get_proto(display, options.xauth_location,
|
|
|
|
options.forward_x11_trusted, &proto, &data);
|
2000-04-30 00:00:53 +00:00
|
|
|
/* Request forwarding with authentication spoofing. */
|
|
|
|
debug("Requesting X11 forwarding with authentication spoofing.");
|
2005-06-17 02:54:33 +00:00
|
|
|
x11_request_forwarding_with_spoofing(id, display, proto, data);
|
2001-01-18 02:04:35 +00:00
|
|
|
interactive = 1;
|
2000-04-30 00:00:53 +00:00
|
|
|
/* XXX wait for reply */
|
|
|
|
}
|
|
|
|
|
2000-11-13 11:57:25 +00:00
|
|
|
check_agent_present();
|
|
|
|
if (options.forward_agent) {
|
|
|
|
debug("Requesting authentication agent forwarding.");
|
|
|
|
channel_request_start(id, "auth-agent-req@openssh.com", 0);
|
|
|
|
packet_send();
|
|
|
|
}
|
|
|
|
|
2005-12-13 08:33:19 +00:00
|
|
|
if (options.tun_open != SSH_TUNMODE_NO) {
|
2005-12-13 08:29:02 +00:00
|
|
|
Channel *c;
|
|
|
|
int fd;
|
|
|
|
|
|
|
|
debug("Requesting tun.");
|
2005-12-13 08:33:19 +00:00
|
|
|
if ((fd = tun_open(options.tun_local,
|
|
|
|
options.tun_open)) >= 0) {
|
2005-12-13 08:29:02 +00:00
|
|
|
c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
|
|
|
|
CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
|
|
|
|
0, "tun", 1);
|
|
|
|
c->datagram = 1;
|
2005-12-31 05:33:36 +00:00
|
|
|
#if defined(SSH_TUN_FILTER)
|
|
|
|
if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
|
|
|
|
channel_register_filter(c->self, sys_tun_infilter,
|
|
|
|
sys_tun_outfilter);
|
|
|
|
#endif
|
2005-12-13 08:29:02 +00:00
|
|
|
packet_start(SSH2_MSG_CHANNEL_OPEN);
|
|
|
|
packet_put_cstring("tun@openssh.com");
|
|
|
|
packet_put_int(c->self);
|
|
|
|
packet_put_int(c->local_window_max);
|
|
|
|
packet_put_int(c->local_maxpacket);
|
2005-12-13 08:33:19 +00:00
|
|
|
packet_put_int(options.tun_open);
|
2005-12-13 08:29:02 +00:00
|
|
|
packet_put_int(options.tun_remote);
|
|
|
|
packet_send();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2004-06-15 00:34:08 +00:00
|
|
|
client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
|
2004-06-17 15:17:29 +00:00
|
|
|
NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
|
2001-02-09 02:36:43 +00:00
|
|
|
|
2001-01-18 02:04:35 +00:00
|
|
|
packet_set_interactive(interactive);
|
2000-04-06 02:32:37 +00:00
|
|
|
}
|
|
|
|
|
2001-09-20 23:13:49 +00:00
|
|
|
/* open new channel for a session */
|
2001-06-25 05:01:22 +00:00
|
|
|
static int
|
2001-09-20 23:13:49 +00:00
|
|
|
ssh_session2_open(void)
|
2000-04-06 02:32:37 +00:00
|
|
|
{
|
2001-05-05 04:09:47 +00:00
|
|
|
Channel *c;
|
|
|
|
int window, packetmax, in, out, err;
|
2000-08-23 00:46:23 +00:00
|
|
|
|
2000-08-29 00:33:50 +00:00
|
|
|
if (stdin_null_flag) {
|
2001-02-09 02:11:24 +00:00
|
|
|
in = open(_PATH_DEVNULL, O_RDONLY);
|
2000-08-29 00:33:50 +00:00
|
|
|
} else {
|
|
|
|
in = dup(STDIN_FILENO);
|
|
|
|
}
|
2000-08-23 00:46:23 +00:00
|
|
|
out = dup(STDOUT_FILENO);
|
|
|
|
err = dup(STDERR_FILENO);
|
2000-04-06 02:32:37 +00:00
|
|
|
|
|
|
|
if (in < 0 || out < 0 || err < 0)
|
2000-08-29 00:33:50 +00:00
|
|
|
fatal("dup() in/out/err failed");
|
2000-04-06 02:32:37 +00:00
|
|
|
|
2000-10-28 03:19:58 +00:00
|
|
|
/* enable nonblocking unless tty */
|
|
|
|
if (!isatty(in))
|
|
|
|
set_nonblock(in);
|
|
|
|
if (!isatty(out))
|
|
|
|
set_nonblock(out);
|
|
|
|
if (!isatty(err))
|
|
|
|
set_nonblock(err);
|
|
|
|
|
2000-09-16 02:29:08 +00:00
|
|
|
window = CHAN_SES_WINDOW_DEFAULT;
|
|
|
|
packetmax = CHAN_SES_PACKET_DEFAULT;
|
2002-02-19 04:20:57 +00:00
|
|
|
if (tty_flag) {
|
|
|
|
window >>= 1;
|
|
|
|
packetmax >>= 1;
|
2000-04-06 02:32:37 +00:00
|
|
|
}
|
2001-05-05 04:09:47 +00:00
|
|
|
c = channel_new(
|
2000-04-06 02:32:37 +00:00
|
|
|
"session", SSH_CHANNEL_OPENING, in, out, err,
|
2000-09-16 02:29:08 +00:00
|
|
|
window, packetmax, CHAN_EXTENDED_WRITE,
|
2003-05-14 03:45:42 +00:00
|
|
|
"client-session", /*nonblock*/0);
|
2000-04-06 02:32:37 +00:00
|
|
|
|
2001-09-20 23:13:49 +00:00
|
|
|
debug3("ssh_session2_open: channel_new: %d", c->self);
|
2001-04-05 23:37:36 +00:00
|
|
|
|
2001-06-09 00:18:51 +00:00
|
|
|
channel_send_open(c->self);
|
2001-09-20 23:13:49 +00:00
|
|
|
if (!no_shell_flag)
|
2004-06-15 00:34:08 +00:00
|
|
|
channel_register_confirm(c->self, ssh_session2_setup, NULL);
|
1999-11-24 13:26:21 +00:00
|
|
|
|
2001-05-05 04:09:47 +00:00
|
|
|
return c->self;
|
2001-04-05 23:37:36 +00:00
|
|
|
}
|
|
|
|
|
2001-06-25 05:01:22 +00:00
|
|
|
static int
|
2001-04-05 23:37:36 +00:00
|
|
|
ssh_session2(void)
|
|
|
|
{
|
2001-09-20 23:13:49 +00:00
|
|
|
int id = -1;
|
2001-04-05 23:37:36 +00:00
|
|
|
|
|
|
|
/* XXX should be pre-session */
|
|
|
|
ssh_init_forwarding();
|
2004-06-15 00:34:08 +00:00
|
|
|
ssh_control_listener();
|
2001-04-05 23:37:36 +00:00
|
|
|
|
2001-09-20 23:13:49 +00:00
|
|
|
if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
|
|
|
|
id = ssh_session2_open();
|
2001-04-05 23:37:36 +00:00
|
|
|
|
2005-12-13 08:29:02 +00:00
|
|
|
/* Execute a local command */
|
|
|
|
if (options.local_command != NULL &&
|
|
|
|
options.permit_local_command)
|
|
|
|
ssh_local_cmd(options.local_command);
|
|
|
|
|
2001-04-05 23:37:36 +00:00
|
|
|
/* If requested, let ssh continue in the background. */
|
|
|
|
if (fork_after_authentication_flag)
|
|
|
|
if (daemon(1, 1) < 0)
|
|
|
|
fatal("daemon() failed: %.200s", strerror(errno));
|
|
|
|
|
2001-06-05 20:32:21 +00:00
|
|
|
return client_loop(tty_flag, tty_flag ?
|
|
|
|
options.escape_char : SSH_ESCAPECHAR_NONE, id);
|
1999-10-27 03:42:43 +00:00
|
|
|
}
|
2000-11-13 11:57:25 +00:00
|
|
|
|
2001-06-25 05:01:22 +00:00
|
|
|
static void
|
2001-03-09 00:12:22 +00:00
|
|
|
load_public_identity_files(void)
|
|
|
|
{
|
2006-03-31 12:13:21 +00:00
|
|
|
char *filename, *cp, thishost[NI_MAXHOST];
|
2001-08-06 21:12:42 +00:00
|
|
|
int i = 0;
|
2002-03-26 03:17:42 +00:00
|
|
|
Key *public;
|
2006-03-31 12:13:21 +00:00
|
|
|
struct passwd *pw;
|
2001-07-04 04:52:03 +00:00
|
|
|
#ifdef SMARTCARD
|
2002-03-26 03:17:42 +00:00
|
|
|
Key **keys;
|
|
|
|
|
2001-08-06 21:35:51 +00:00
|
|
|
if (options.smartcard_device != NULL &&
|
2002-03-26 03:17:42 +00:00
|
|
|
options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
|
2006-08-05 01:38:40 +00:00
|
|
|
(keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
|
2002-03-26 03:17:42 +00:00
|
|
|
int count = 0;
|
|
|
|
for (i = 0; keys[i] != NULL; i++) {
|
|
|
|
count++;
|
|
|
|
memmove(&options.identity_files[1], &options.identity_files[0],
|
|
|
|
sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
|
|
|
|
memmove(&options.identity_keys[1], &options.identity_keys[0],
|
|
|
|
sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
|
|
|
|
options.num_identity_files++;
|
|
|
|
options.identity_keys[0] = keys[i];
|
2003-06-18 10:28:40 +00:00
|
|
|
options.identity_files[0] = sc_get_key_label(keys[i]);
|
2002-03-26 03:17:42 +00:00
|
|
|
}
|
2002-03-26 03:23:00 +00:00
|
|
|
if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
|
|
|
|
options.num_identity_files = SSH_MAX_IDENTITY_FILES;
|
2002-03-26 03:17:42 +00:00
|
|
|
i = count;
|
|
|
|
xfree(keys);
|
2001-07-04 04:52:03 +00:00
|
|
|
}
|
2001-08-06 21:57:31 +00:00
|
|
|
#endif /* SMARTCARD */
|
2006-03-31 12:13:21 +00:00
|
|
|
if ((pw = getpwuid(original_real_uid)) == NULL)
|
|
|
|
fatal("load_public_identity_files: getpwuid failed");
|
|
|
|
if (gethostname(thishost, sizeof(thishost)) == -1)
|
|
|
|
fatal("load_public_identity_files: gethostname: %s",
|
|
|
|
strerror(errno));
|
2001-08-06 21:12:42 +00:00
|
|
|
for (; i < options.num_identity_files; i++) {
|
2006-03-31 12:13:21 +00:00
|
|
|
cp = tilde_expand_filename(options.identity_files[i],
|
2001-08-06 21:12:42 +00:00
|
|
|
original_real_uid);
|
2006-03-31 12:13:21 +00:00
|
|
|
filename = percent_expand(cp, "d", pw->pw_dir,
|
2006-08-05 02:39:39 +00:00
|
|
|
"u", pw->pw_name, "l", thishost, "h", host,
|
2006-03-31 12:13:21 +00:00
|
|
|
"r", options.user, (char *)NULL);
|
|
|
|
xfree(cp);
|
2001-08-06 21:12:42 +00:00
|
|
|
public = key_load_public(filename, NULL);
|
|
|
|
debug("identity file %s type %d", filename,
|
|
|
|
public ? public->type : -1);
|
|
|
|
xfree(options.identity_files[i]);
|
|
|
|
options.identity_files[i] = filename;
|
|
|
|
options.identity_keys[i] = public;
|
|
|
|
}
|
2001-03-09 00:12:22 +00:00
|
|
|
}
|
2004-06-15 00:34:08 +00:00
|
|
|
|
|
|
|
static void
|
|
|
|
control_client_sighandler(int signo)
|
|
|
|
{
|
|
|
|
control_client_terminate = signo;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
control_client_sigrelay(int signo)
|
|
|
|
{
|
|
|
|
if (control_server_pid > 1)
|
|
|
|
kill(control_server_pid, signo);
|
|
|
|
}
|
|
|
|
|
2004-06-22 02:29:23 +00:00
|
|
|
static int
|
|
|
|
env_permitted(char *env)
|
|
|
|
{
|
2006-07-12 12:16:23 +00:00
|
|
|
int i, ret;
|
2004-06-22 02:29:23 +00:00
|
|
|
char name[1024], *cp;
|
|
|
|
|
2006-07-12 12:16:23 +00:00
|
|
|
if ((cp = strchr(env, '=')) == NULL || cp == env)
|
2004-06-22 02:29:23 +00:00
|
|
|
return (0);
|
2006-07-12 12:23:35 +00:00
|
|
|
ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env);
|
2006-07-12 12:16:23 +00:00
|
|
|
if (ret <= 0 || (size_t)ret >= sizeof(name))
|
|
|
|
fatal("env_permitted: name '%.100s...' too long", env);
|
2004-06-22 02:29:23 +00:00
|
|
|
|
|
|
|
for (i = 0; i < options.num_send_env; i++)
|
|
|
|
if (match_pattern(name, options.send_env[i]))
|
|
|
|
return (1);
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
2004-06-15 00:34:08 +00:00
|
|
|
static void
|
|
|
|
control_client(const char *path)
|
|
|
|
{
|
|
|
|
struct sockaddr_un addr;
|
2004-11-05 09:19:51 +00:00
|
|
|
int i, r, fd, sock, exitval, num_env, addr_len;
|
2004-06-15 00:34:08 +00:00
|
|
|
Buffer m;
|
2004-11-07 09:06:19 +00:00
|
|
|
char *term;
|
2004-06-17 15:17:29 +00:00
|
|
|
extern char **environ;
|
2004-11-07 09:06:19 +00:00
|
|
|
u_int flags;
|
2004-07-17 06:12:08 +00:00
|
|
|
|
2005-06-16 03:19:41 +00:00
|
|
|
if (mux_command == 0)
|
|
|
|
mux_command = SSHMUX_COMMAND_OPEN;
|
|
|
|
|
|
|
|
switch (options.control_master) {
|
|
|
|
case SSHCTL_MASTER_AUTO:
|
|
|
|
case SSHCTL_MASTER_AUTO_ASK:
|
|
|
|
debug("auto-mux: Trying existing master");
|
|
|
|
/* FALLTHROUGH */
|
|
|
|
case SSHCTL_MASTER_NO:
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2004-06-15 00:34:08 +00:00
|
|
|
memset(&addr, '\0', sizeof(addr));
|
|
|
|
addr.sun_family = AF_UNIX;
|
2004-06-15 01:14:45 +00:00
|
|
|
addr_len = offsetof(struct sockaddr_un, sun_path) +
|
2004-06-15 00:34:08 +00:00
|
|
|
strlen(path) + 1;
|
|
|
|
|
|
|
|
if (strlcpy(addr.sun_path, path,
|
|
|
|
sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
|
|
|
|
fatal("ControlPath too long");
|
|
|
|
|
|
|
|
if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
|
|
|
|
fatal("%s socket(): %s", __func__, strerror(errno));
|
|
|
|
|
2006-03-26 03:07:26 +00:00
|
|
|
if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) {
|
2005-06-01 13:08:51 +00:00
|
|
|
if (mux_command != SSHMUX_COMMAND_OPEN) {
|
|
|
|
fatal("Control socket connect(%.100s): %s", path,
|
|
|
|
strerror(errno));
|
|
|
|
}
|
2005-05-26 02:11:28 +00:00
|
|
|
if (errno == ENOENT)
|
2006-03-26 02:59:59 +00:00
|
|
|
debug("Control socket \"%.100s\" does not exist", path);
|
2005-05-26 02:11:28 +00:00
|
|
|
else {
|
2006-03-26 02:59:59 +00:00
|
|
|
error("Control socket connect(%.100s): %s", path,
|
2005-05-26 02:11:28 +00:00
|
|
|
strerror(errno));
|
|
|
|
}
|
2006-03-26 02:59:59 +00:00
|
|
|
close(sock);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (stdin_null_flag) {
|
|
|
|
if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
|
|
|
|
fatal("open(/dev/null): %s", strerror(errno));
|
|
|
|
if (dup2(fd, STDIN_FILENO) == -1)
|
|
|
|
fatal("dup2: %s", strerror(errno));
|
|
|
|
if (fd > STDERR_FILENO)
|
|
|
|
close(fd);
|
|
|
|
}
|
2005-07-17 07:02:09 +00:00
|
|
|
|
2005-07-05 23:44:19 +00:00
|
|
|
term = getenv("TERM");
|
2004-11-07 09:06:19 +00:00
|
|
|
|
|
|
|
flags = 0;
|
|
|
|
if (tty_flag)
|
|
|
|
flags |= SSHMUX_FLAG_TTY;
|
|
|
|
if (subsystem_flag)
|
|
|
|
flags |= SSHMUX_FLAG_SUBSYS;
|
2005-07-05 23:44:19 +00:00
|
|
|
if (options.forward_x11)
|
|
|
|
flags |= SSHMUX_FLAG_X11_FWD;
|
|
|
|
if (options.forward_agent)
|
|
|
|
flags |= SSHMUX_FLAG_AGENT_FWD;
|
2004-06-15 00:34:08 +00:00
|
|
|
|
|
|
|
buffer_init(&m);
|
|
|
|
|
2004-11-07 09:06:19 +00:00
|
|
|
/* Send our command to server */
|
|
|
|
buffer_put_int(&m, mux_command);
|
|
|
|
buffer_put_int(&m, flags);
|
2005-07-05 23:44:19 +00:00
|
|
|
if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
|
2004-11-07 09:06:19 +00:00
|
|
|
fatal("%s: msg_send", __func__);
|
|
|
|
buffer_clear(&m);
|
|
|
|
|
|
|
|
/* Get authorisation status and PID of controlee */
|
2004-06-15 00:34:08 +00:00
|
|
|
if (ssh_msg_recv(sock, &m) == -1)
|
|
|
|
fatal("%s: msg_recv", __func__);
|
2005-07-05 23:44:19 +00:00
|
|
|
if (buffer_get_char(&m) != SSHMUX_VER)
|
2004-06-15 00:34:08 +00:00
|
|
|
fatal("%s: wrong version", __func__);
|
2004-06-17 15:19:03 +00:00
|
|
|
if (buffer_get_int(&m) != 1)
|
|
|
|
fatal("Connection to master denied");
|
2004-06-15 00:34:08 +00:00
|
|
|
control_server_pid = buffer_get_int(&m);
|
|
|
|
|
|
|
|
buffer_clear(&m);
|
|
|
|
|
2004-11-07 09:06:19 +00:00
|
|
|
switch (mux_command) {
|
|
|
|
case SSHMUX_COMMAND_ALIVE_CHECK:
|
2005-03-14 12:08:12 +00:00
|
|
|
fprintf(stderr, "Master running (pid=%d)\r\n",
|
2004-11-07 09:06:19 +00:00
|
|
|
control_server_pid);
|
|
|
|
exit(0);
|
|
|
|
case SSHMUX_COMMAND_TERMINATE:
|
|
|
|
fprintf(stderr, "Exit request sent.\r\n");
|
|
|
|
exit(0);
|
|
|
|
case SSHMUX_COMMAND_OPEN:
|
|
|
|
/* continue below */
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
fatal("silly mux_command %d", mux_command);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* SSHMUX_COMMAND_OPEN */
|
2005-07-05 23:44:19 +00:00
|
|
|
buffer_put_cstring(&m, term ? term : "");
|
2004-06-15 00:34:08 +00:00
|
|
|
buffer_append(&command, "\0", 1);
|
|
|
|
buffer_put_cstring(&m, buffer_ptr(&command));
|
|
|
|
|
2004-06-22 02:29:23 +00:00
|
|
|
if (options.num_send_env == 0 || environ == NULL) {
|
|
|
|
buffer_put_int(&m, 0);
|
2004-07-17 06:12:08 +00:00
|
|
|
} else {
|
2004-06-22 02:29:23 +00:00
|
|
|
/* Pass environment */
|
|
|
|
num_env = 0;
|
|
|
|
for (i = 0; environ[i] != NULL; i++)
|
|
|
|
if (env_permitted(environ[i]))
|
|
|
|
num_env++; /* Count */
|
2004-07-17 06:12:08 +00:00
|
|
|
|
2004-06-22 02:29:23 +00:00
|
|
|
buffer_put_int(&m, num_env);
|
|
|
|
|
2004-06-23 14:34:53 +00:00
|
|
|
for (i = 0; environ[i] != NULL && num_env >= 0; i++)
|
|
|
|
if (env_permitted(environ[i])) {
|
|
|
|
num_env--;
|
2004-06-22 02:29:23 +00:00
|
|
|
buffer_put_cstring(&m, environ[i]);
|
2004-06-23 14:34:53 +00:00
|
|
|
}
|
2004-06-22 02:29:23 +00:00
|
|
|
}
|
2004-06-17 15:17:29 +00:00
|
|
|
|
2005-07-05 23:44:19 +00:00
|
|
|
if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
|
2004-06-15 00:34:08 +00:00
|
|
|
fatal("%s: msg_send", __func__);
|
|
|
|
|
|
|
|
mm_send_fd(sock, STDIN_FILENO);
|
|
|
|
mm_send_fd(sock, STDOUT_FILENO);
|
|
|
|
mm_send_fd(sock, STDERR_FILENO);
|
|
|
|
|
|
|
|
/* Wait for reply, so master has a chance to gather ttymodes */
|
|
|
|
buffer_clear(&m);
|
|
|
|
if (ssh_msg_recv(sock, &m) == -1)
|
|
|
|
fatal("%s: msg_recv", __func__);
|
2005-07-05 23:44:19 +00:00
|
|
|
if (buffer_get_char(&m) != SSHMUX_VER)
|
2004-11-07 09:06:19 +00:00
|
|
|
fatal("%s: wrong version", __func__);
|
2004-06-15 00:34:08 +00:00
|
|
|
buffer_free(&m);
|
|
|
|
|
2004-11-05 09:02:16 +00:00
|
|
|
signal(SIGHUP, control_client_sighandler);
|
2004-06-18 12:20:57 +00:00
|
|
|
signal(SIGINT, control_client_sighandler);
|
|
|
|
signal(SIGTERM, control_client_sighandler);
|
|
|
|
signal(SIGWINCH, control_client_sigrelay);
|
|
|
|
|
2004-06-15 00:34:08 +00:00
|
|
|
if (tty_flag)
|
|
|
|
enter_raw_mode();
|
|
|
|
|
|
|
|
/* Stick around until the controlee closes the client_fd */
|
|
|
|
exitval = 0;
|
|
|
|
for (;!control_client_terminate;) {
|
|
|
|
r = read(sock, &exitval, sizeof(exitval));
|
|
|
|
if (r == 0) {
|
|
|
|
debug2("Received EOF from master");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (r > 0)
|
|
|
|
debug2("Received exit status from master %d", exitval);
|
|
|
|
if (r == -1 && errno != EINTR)
|
|
|
|
fatal("%s: read %s", __func__, strerror(errno));
|
|
|
|
}
|
|
|
|
|
|
|
|
if (control_client_terminate)
|
|
|
|
debug2("Exiting on signal %d", control_client_terminate);
|
|
|
|
|
|
|
|
close(sock);
|
|
|
|
|
|
|
|
leave_raw_mode();
|
|
|
|
|
|
|
|
if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
|
|
|
|
fprintf(stderr, "Connection to master closed.\r\n");
|
|
|
|
|
|
|
|
exit(exitval);
|
|
|
|
}
|