mirror of
https://github.com/friendica/friendica
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2302 lines
No EOL
85 KiB
PHP
2302 lines
No EOL
85 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Pure-PHP implementation of SSHv2.
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*
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* PHP versions 4 and 5
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*
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* Here are some examples of how to use this library:
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* <code>
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* <?php
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* include('Net/SSH2.php');
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*
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* $ssh = new Net_SSH2('www.domain.tld');
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* if (!$ssh->login('username', 'password')) {
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* exit('Login Failed');
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* }
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*
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* echo $ssh->exec('pwd');
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* echo $ssh->exec('ls -la');
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* ?>
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* </code>
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*
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* <code>
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* <?php
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* include('Crypt/RSA.php');
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* include('Net/SSH2.php');
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*
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* $key = new Crypt_RSA();
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* //$key->setPassword('whatever');
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* $key->loadKey(file_get_contents('privatekey'));
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*
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* $ssh = new Net_SSH2('www.domain.tld');
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* if (!$ssh->login('username', $key)) {
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* exit('Login Failed');
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* }
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*
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* echo $ssh->exec('pwd');
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* echo $ssh->exec('ls -la');
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* ?>
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* </code>
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*
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* LICENSE: This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* @category Net
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* @package Net_SSH2
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* @author Jim Wigginton <terrafrost@php.net>
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* @copyright MMVII Jim Wigginton
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* @license http://www.gnu.org/licenses/lgpl.txt
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* @version $Id: SSH2.php,v 1.46 2010/04/27 21:29:36 terrafrost Exp $
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* @link http://phpseclib.sourceforge.net
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*/
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/**
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* Include Math_BigInteger
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*
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* Used to do Diffie-Hellman key exchange and DSA/RSA signature verification.
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*/
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require_once('Math/BigInteger.php');
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/**
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* Include Crypt_Random
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*/
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require_once('Crypt/Random.php');
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/**
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* Include Crypt_Hash
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*/
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require_once('Crypt/Hash.php');
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/**
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* Include Crypt_TripleDES
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*/
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require_once('Crypt/TripleDES.php');
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/**
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* Include Crypt_RC4
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*/
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require_once('Crypt/RC4.php');
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/**
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* Include Crypt_AES
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*/
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require_once('Crypt/AES.php');
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/**#@+
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* Execution Bitmap Masks
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*
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* @see Net_SSH2::bitmap
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* @access private
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*/
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define('NET_SSH2_MASK_CONSTRUCTOR', 0x00000001);
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define('NET_SSH2_MASK_LOGIN', 0x00000002);
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/**#@-*/
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/**#@+
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* Channel constants
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*
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* RFC4254 refers not to client and server channels but rather to sender and recipient channels. we don't refer
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* to them in that way because RFC4254 toggles the meaning. the client sends a SSH_MSG_CHANNEL_OPEN message with
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* a sender channel and the server sends a SSH_MSG_CHANNEL_OPEN_CONFIRMATION in response, with a sender and a
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* recepient channel. at first glance, you might conclude that SSH_MSG_CHANNEL_OPEN_CONFIRMATION's sender channel
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* would be the same thing as SSH_MSG_CHANNEL_OPEN's sender channel, but it's not, per this snipet:
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* The 'recipient channel' is the channel number given in the original
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* open request, and 'sender channel' is the channel number allocated by
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* the other side.
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*
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* @see Net_SSH2::_send_channel_packet()
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* @see Net_SSH2::_get_channel_packet()
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* @access private
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*/
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define('NET_SSH2_CHANNEL_EXEC', 0); // PuTTy uses 0x100
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/**#@-*/
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/**#@+
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* @access public
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* @see Net_SSH2::getLog()
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*/
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/**
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* Returns the message numbers
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*/
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define('NET_SSH2_LOG_SIMPLE', 1);
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/**
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* Returns the message content
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*/
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define('NET_SSH2_LOG_COMPLEX', 2);
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/**#@-*/
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/**
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* Pure-PHP implementation of SSHv2.
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*
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* @author Jim Wigginton <terrafrost@php.net>
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* @version 0.1.0
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* @access public
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* @package Net_SSH2
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*/
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class Net_SSH2 {
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/**
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* The SSH identifier
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*
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* @var String
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* @access private
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*/
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var $identifier = 'SSH-2.0-phpseclib_0.2';
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/**
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* The Socket Object
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*
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* @var Object
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* @access private
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*/
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var $fsock;
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/**
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* Execution Bitmap
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*
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* The bits that are set reprsent functions that have been called already. This is used to determine
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* if a requisite function has been successfully executed. If not, an error should be thrown.
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*
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* @var Integer
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* @access private
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*/
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var $bitmap = 0;
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/**
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* Error information
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*
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* @see Net_SSH2::getErrors()
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* @see Net_SSH2::getLastError()
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* @var String
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* @access private
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*/
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var $errors = array();
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/**
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* Server Identifier
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*
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* @see Net_SSH2::getServerIdentification()
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* @var String
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* @access private
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*/
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var $server_identifier = '';
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/**
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* Key Exchange Algorithms
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*
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* @see Net_SSH2::getKexAlgorithims()
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* @var Array
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* @access private
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*/
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var $kex_algorithms;
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/**
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* Server Host Key Algorithms
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*
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* @see Net_SSH2::getServerHostKeyAlgorithms()
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* @var Array
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* @access private
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*/
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var $server_host_key_algorithms;
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/**
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* Encryption Algorithms: Client to Server
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*
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* @see Net_SSH2::getEncryptionAlgorithmsClient2Server()
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* @var Array
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* @access private
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*/
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var $encryption_algorithms_client_to_server;
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/**
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* Encryption Algorithms: Server to Client
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*
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* @see Net_SSH2::getEncryptionAlgorithmsServer2Client()
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* @var Array
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* @access private
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*/
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var $encryption_algorithms_server_to_client;
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/**
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* MAC Algorithms: Client to Server
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*
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* @see Net_SSH2::getMACAlgorithmsClient2Server()
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* @var Array
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* @access private
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*/
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var $mac_algorithms_client_to_server;
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/**
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* MAC Algorithms: Server to Client
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*
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* @see Net_SSH2::getMACAlgorithmsServer2Client()
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* @var Array
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* @access private
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*/
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var $mac_algorithms_server_to_client;
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/**
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* Compression Algorithms: Client to Server
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*
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* @see Net_SSH2::getCompressionAlgorithmsClient2Server()
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* @var Array
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* @access private
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*/
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var $compression_algorithms_client_to_server;
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/**
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* Compression Algorithms: Server to Client
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*
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* @see Net_SSH2::getCompressionAlgorithmsServer2Client()
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* @var Array
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* @access private
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*/
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var $compression_algorithms_server_to_client;
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/**
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* Languages: Server to Client
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*
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* @see Net_SSH2::getLanguagesServer2Client()
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* @var Array
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* @access private
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*/
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var $languages_server_to_client;
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/**
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* Languages: Client to Server
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*
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* @see Net_SSH2::getLanguagesClient2Server()
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* @var Array
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* @access private
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*/
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var $languages_client_to_server;
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/**
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* Block Size for Server to Client Encryption
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*
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* "Note that the length of the concatenation of 'packet_length',
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* 'padding_length', 'payload', and 'random padding' MUST be a multiple
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* of the cipher block size or 8, whichever is larger. This constraint
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* MUST be enforced, even when using stream ciphers."
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*
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* -- http://tools.ietf.org/html/rfc4253#section-6
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*
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* @see Net_SSH2::Net_SSH2()
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* @see Net_SSH2::_send_binary_packet()
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* @var Integer
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* @access private
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*/
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var $encrypt_block_size = 8;
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/**
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* Block Size for Client to Server Encryption
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*
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* @see Net_SSH2::Net_SSH2()
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* @see Net_SSH2::_get_binary_packet()
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* @var Integer
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* @access private
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*/
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var $decrypt_block_size = 8;
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/**
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* Server to Client Encryption Object
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*
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* @see Net_SSH2::_get_binary_packet()
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* @var Object
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* @access private
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*/
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var $decrypt = false;
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/**
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* Client to Server Encryption Object
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*
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* @see Net_SSH2::_send_binary_packet()
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* @var Object
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* @access private
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*/
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var $encrypt = false;
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/**
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* Client to Server HMAC Object
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*
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* @see Net_SSH2::_send_binary_packet()
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* @var Object
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* @access private
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*/
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var $hmac_create = false;
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/**
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* Server to Client HMAC Object
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*
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* @see Net_SSH2::_get_binary_packet()
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* @var Object
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* @access private
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*/
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var $hmac_check = false;
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/**
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* Size of server to client HMAC
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*
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* We need to know how big the HMAC will be for the server to client direction so that we know how many bytes to read.
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* For the client to server side, the HMAC object will make the HMAC as long as it needs to be. All we need to do is
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* append it.
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*
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* @see Net_SSH2::_get_binary_packet()
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* @var Integer
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* @access private
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*/
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var $hmac_size = false;
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/**
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* Server Public Host Key
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*
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* @see Net_SSH2::getServerPublicHostKey()
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* @var String
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* @access private
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*/
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var $server_public_host_key;
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/**
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* Session identifer
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*
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* "The exchange hash H from the first key exchange is additionally
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* used as the session identifier, which is a unique identifier for
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* this connection."
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*
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* -- http://tools.ietf.org/html/rfc4253#section-7.2
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*
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* @see Net_SSH2::_key_exchange()
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* @var String
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* @access private
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*/
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var $session_id = false;
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/**
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* Message Numbers
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*
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* @see Net_SSH2::Net_SSH2()
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* @var Array
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* @access private
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*/
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var $message_numbers = array();
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/**
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* Disconnection Message 'reason codes' defined in RFC4253
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*
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* @see Net_SSH2::Net_SSH2()
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* @var Array
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* @access private
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*/
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var $disconnect_reasons = array();
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/**
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* SSH_MSG_CHANNEL_OPEN_FAILURE 'reason codes', defined in RFC4254
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*
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* @see Net_SSH2::Net_SSH2()
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* @var Array
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* @access private
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*/
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var $channel_open_failure_reasons = array();
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/**
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* Terminal Modes
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*
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* @link http://tools.ietf.org/html/rfc4254#section-8
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* @see Net_SSH2::Net_SSH2()
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* @var Array
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* @access private
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*/
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var $terminal_modes = array();
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/**
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* SSH_MSG_CHANNEL_EXTENDED_DATA's data_type_codes
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*
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* @link http://tools.ietf.org/html/rfc4254#section-5.2
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* @see Net_SSH2::Net_SSH2()
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* @var Array
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* @access private
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*/
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var $channel_extended_data_type_codes = array();
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/**
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* Send Sequence Number
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*
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* See 'Section 6.4. Data Integrity' of rfc4253 for more info.
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*
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* @see Net_SSH2::_send_binary_packet()
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* @var Integer
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* @access private
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*/
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var $send_seq_no = 0;
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/**
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* Get Sequence Number
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*
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* See 'Section 6.4. Data Integrity' of rfc4253 for more info.
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*
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* @see Net_SSH2::_get_binary_packet()
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* @var Integer
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* @access private
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*/
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var $get_seq_no = 0;
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|
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/**
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* Server Channels
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*
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* Maps client channels to server channels
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*
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* @see Net_SSH2::_get_channel_packet()
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* @see Net_SSH2::exec()
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* @var Array
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* @access private
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*/
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var $server_channels = array();
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/**
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* Channel Buffers
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*
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* If a client requests a packet from one channel but receives two packets from another those packets should
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* be placed in a buffer
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*
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* @see Net_SSH2::_get_channel_packet()
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* @see Net_SSH2::exec()
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* @var Array
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* @access private
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*/
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var $channel_buffers = array();
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|
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/**
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* Channel Status
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*
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* Contains the type of the last sent message
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*
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* @see Net_SSH2::_get_channel_packet()
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* @var Array
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* @access private
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*/
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var $channel_status = array();
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/**
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* Packet Size
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*
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* Maximum packet size indexed by channel
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*
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* @see Net_SSH2::_send_channel_packet()
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* @var Array
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* @access private
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*/
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var $packet_size_client_to_server = array();
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|
|
/**
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* Message Number Log
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|
*
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* @see Net_SSH2::getLog()
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* @var Array
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* @access private
|
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*/
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var $message_number_log = array();
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|
|
|
/**
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* Message Log
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|
*
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|
* @see Net_SSH2::getLog()
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* @var Array
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* @access private
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*/
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var $message_log = array();
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|
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/**
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* The Window Size
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|
*
|
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* Bytes the other party can send before it must wait for the window to be adjusted (0x7FFFFFFF = 4GB)
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*
|
|
* @var Integer
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|
* @see Net_SSH2::_send_channel_packet()
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* @see Net_SSH2::exec()
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* @access private
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*/
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var $window_size = 0x7FFFFFFF;
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|
|
|
/**
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|
* Window size
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|
*
|
|
* Window size indexed by channel
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|
*
|
|
* @see Net_SSH2::_send_channel_packet()
|
|
* @var Array
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|
* @access private
|
|
*/
|
|
var $window_size_client_to_server = array();
|
|
|
|
/**
|
|
* Server signature
|
|
*
|
|
* Verified against $this->session_id
|
|
*
|
|
* @see Net_SSH2::getServerPublicHostKey()
|
|
* @var String
|
|
* @access private
|
|
*/
|
|
var $signature = '';
|
|
|
|
/**
|
|
* Server signature format
|
|
*
|
|
* ssh-rsa or ssh-dss.
|
|
*
|
|
* @see Net_SSH2::getServerPublicHostKey()
|
|
* @var String
|
|
* @access private
|
|
*/
|
|
var $signature_format = '';
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|
|
|
/**
|
|
* Default Constructor.
|
|
*
|
|
* Connects to an SSHv2 server
|
|
*
|
|
* @param String $host
|
|
* @param optional Integer $port
|
|
* @param optional Integer $timeout
|
|
* @return Net_SSH2
|
|
* @access public
|
|
*/
|
|
function Net_SSH2($host, $port = 22, $timeout = 10)
|
|
{
|
|
$this->message_numbers = array(
|
|
1 => 'NET_SSH2_MSG_DISCONNECT',
|
|
2 => 'NET_SSH2_MSG_IGNORE',
|
|
3 => 'NET_SSH2_MSG_UNIMPLEMENTED',
|
|
4 => 'NET_SSH2_MSG_DEBUG',
|
|
5 => 'NET_SSH2_MSG_SERVICE_REQUEST',
|
|
6 => 'NET_SSH2_MSG_SERVICE_ACCEPT',
|
|
20 => 'NET_SSH2_MSG_KEXINIT',
|
|
21 => 'NET_SSH2_MSG_NEWKEYS',
|
|
30 => 'NET_SSH2_MSG_KEXDH_INIT',
|
|
31 => 'NET_SSH2_MSG_KEXDH_REPLY',
|
|
50 => 'NET_SSH2_MSG_USERAUTH_REQUEST',
|
|
51 => 'NET_SSH2_MSG_USERAUTH_FAILURE',
|
|
52 => 'NET_SSH2_MSG_USERAUTH_SUCCESS',
|
|
53 => 'NET_SSH2_MSG_USERAUTH_BANNER',
|
|
|
|
80 => 'NET_SSH2_MSG_GLOBAL_REQUEST',
|
|
81 => 'NET_SSH2_MSG_REQUEST_SUCCESS',
|
|
82 => 'NET_SSH2_MSG_REQUEST_FAILURE',
|
|
90 => 'NET_SSH2_MSG_CHANNEL_OPEN',
|
|
91 => 'NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION',
|
|
92 => 'NET_SSH2_MSG_CHANNEL_OPEN_FAILURE',
|
|
93 => 'NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST',
|
|
94 => 'NET_SSH2_MSG_CHANNEL_DATA',
|
|
95 => 'NET_SSH2_MSG_CHANNEL_EXTENDED_DATA',
|
|
96 => 'NET_SSH2_MSG_CHANNEL_EOF',
|
|
97 => 'NET_SSH2_MSG_CHANNEL_CLOSE',
|
|
98 => 'NET_SSH2_MSG_CHANNEL_REQUEST',
|
|
99 => 'NET_SSH2_MSG_CHANNEL_SUCCESS',
|
|
100 => 'NET_SSH2_MSG_CHANNEL_FAILURE'
|
|
);
|
|
$this->disconnect_reasons = array(
|
|
1 => 'NET_SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT',
|
|
2 => 'NET_SSH2_DISCONNECT_PROTOCOL_ERROR',
|
|
3 => 'NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED',
|
|
4 => 'NET_SSH2_DISCONNECT_RESERVED',
|
|
5 => 'NET_SSH2_DISCONNECT_MAC_ERROR',
|
|
6 => 'NET_SSH2_DISCONNECT_COMPRESSION_ERROR',
|
|
7 => 'NET_SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE',
|
|
8 => 'NET_SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED',
|
|
9 => 'NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE',
|
|
10 => 'NET_SSH2_DISCONNECT_CONNECTION_LOST',
|
|
11 => 'NET_SSH2_DISCONNECT_BY_APPLICATION',
|
|
12 => 'NET_SSH2_DISCONNECT_TOO_MANY_CONNECTIONS',
|
|
13 => 'NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER',
|
|
14 => 'NET_SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE',
|
|
15 => 'NET_SSH2_DISCONNECT_ILLEGAL_USER_NAME'
|
|
);
|
|
$this->channel_open_failure_reasons = array(
|
|
1 => 'NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED'
|
|
);
|
|
$this->terminal_modes = array(
|
|
0 => 'NET_SSH2_TTY_OP_END'
|
|
);
|
|
$this->channel_extended_data_type_codes = array(
|
|
1 => 'NET_SSH2_EXTENDED_DATA_STDERR'
|
|
);
|
|
|
|
$this->_define_array(
|
|
$this->message_numbers,
|
|
$this->disconnect_reasons,
|
|
$this->channel_open_failure_reasons,
|
|
$this->terminal_modes,
|
|
$this->channel_extended_data_type_codes,
|
|
array(60 => 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ'),
|
|
array(60 => 'NET_SSH2_MSG_USERAUTH_PK_OK')
|
|
);
|
|
|
|
$this->fsock = @fsockopen($host, $port, $errno, $errstr, $timeout);
|
|
if (!$this->fsock) {
|
|
user_error(rtrim("Cannot connect to $host. Error $errno. $errstr"), E_USER_NOTICE);
|
|
return;
|
|
}
|
|
|
|
/* According to the SSH2 specs,
|
|
|
|
"The server MAY send other lines of data before sending the version
|
|
string. Each line SHOULD be terminated by a Carriage Return and Line
|
|
Feed. Such lines MUST NOT begin with "SSH-", and SHOULD be encoded
|
|
in ISO-10646 UTF-8 [RFC3629] (language is not specified). Clients
|
|
MUST be able to process such lines." */
|
|
$temp = '';
|
|
$extra = '';
|
|
while (!feof($this->fsock) && !preg_match('#^SSH-(\d\.\d+)#', $temp, $matches)) {
|
|
if (substr($temp, -2) == "\r\n") {
|
|
$extra.= $temp;
|
|
$temp = '';
|
|
}
|
|
$temp.= fgets($this->fsock, 255);
|
|
}
|
|
|
|
$ext = array();
|
|
if (extension_loaded('mcrypt')) {
|
|
$ext[] = 'mcrypt';
|
|
}
|
|
if (extension_loaded('gmp')) {
|
|
$ext[] = 'gmp';
|
|
} else if (extension_loaded('bcmath')) {
|
|
$ext[] = 'bcmath';
|
|
}
|
|
|
|
if (!empty($ext)) {
|
|
$this->identifier.= ' (' . implode(', ', $ext) . ')';
|
|
}
|
|
|
|
if (defined('NET_SSH2_LOGGING')) {
|
|
$this->message_number_log[] = '<-';
|
|
$this->message_number_log[] = '->';
|
|
|
|
if (NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) {
|
|
$this->message_log[] = $temp;
|
|
$this->message_log[] = $this->identifier . "\r\n";
|
|
}
|
|
}
|
|
|
|
$this->server_identifier = trim($temp, "\r\n");
|
|
if (!empty($extra)) {
|
|
$this->errors[] = utf8_decode($extra);
|
|
}
|
|
|
|
if ($matches[1] != '1.99' && $matches[1] != '2.0') {
|
|
user_error("Cannot connect to SSH $matches[1] servers", E_USER_NOTICE);
|
|
return;
|
|
}
|
|
|
|
fputs($this->fsock, $this->identifier . "\r\n");
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server', E_USER_NOTICE);
|
|
return;
|
|
}
|
|
|
|
if (ord($response[0]) != NET_SSH2_MSG_KEXINIT) {
|
|
user_error('Expected SSH_MSG_KEXINIT', E_USER_NOTICE);
|
|
return;
|
|
}
|
|
|
|
if (!$this->_key_exchange($response)) {
|
|
return;
|
|
}
|
|
|
|
$this->bitmap = NET_SSH2_MASK_CONSTRUCTOR;
|
|
}
|
|
|
|
/**
|
|
* Key Exchange
|
|
*
|
|
* @param String $kexinit_payload_server
|
|
* @access private
|
|
*/
|
|
function _key_exchange($kexinit_payload_server)
|
|
{
|
|
static $kex_algorithms = array(
|
|
'diffie-hellman-group1-sha1', // REQUIRED
|
|
'diffie-hellman-group14-sha1' // REQUIRED
|
|
);
|
|
|
|
static $server_host_key_algorithms = array(
|
|
'ssh-rsa', // RECOMMENDED sign Raw RSA Key
|
|
'ssh-dss' // REQUIRED sign Raw DSS Key
|
|
);
|
|
|
|
static $encryption_algorithms = array(
|
|
// from <http://tools.ietf.org/html/rfc4345#section-4>:
|
|
'arcfour256',
|
|
'arcfour128',
|
|
|
|
'arcfour', // OPTIONAL the ARCFOUR stream cipher with a 128-bit key
|
|
|
|
'aes128-cbc', // RECOMMENDED AES with a 128-bit key
|
|
'aes192-cbc', // OPTIONAL AES with a 192-bit key
|
|
'aes256-cbc', // OPTIONAL AES in CBC mode, with a 256-bit key
|
|
|
|
// from <http://tools.ietf.org/html/rfc4344#section-4>:
|
|
'aes128-ctr', // RECOMMENDED AES (Rijndael) in SDCTR mode, with 128-bit key
|
|
'aes192-ctr', // RECOMMENDED AES with 192-bit key
|
|
'aes256-ctr', // RECOMMENDED AES with 256-bit key
|
|
'3des-ctr', // RECOMMENDED Three-key 3DES in SDCTR mode
|
|
|
|
'3des-cbc', // REQUIRED three-key 3DES in CBC mode
|
|
'none' // OPTIONAL no encryption; NOT RECOMMENDED
|
|
);
|
|
|
|
static $mac_algorithms = array(
|
|
'hmac-sha1-96', // RECOMMENDED first 96 bits of HMAC-SHA1 (digest length = 12, key length = 20)
|
|
'hmac-sha1', // REQUIRED HMAC-SHA1 (digest length = key length = 20)
|
|
'hmac-md5-96', // OPTIONAL first 96 bits of HMAC-MD5 (digest length = 12, key length = 16)
|
|
'hmac-md5', // OPTIONAL HMAC-MD5 (digest length = key length = 16)
|
|
'none' // OPTIONAL no MAC; NOT RECOMMENDED
|
|
);
|
|
|
|
static $compression_algorithms = array(
|
|
'none' // REQUIRED no compression
|
|
//'zlib' // OPTIONAL ZLIB (LZ77) compression
|
|
);
|
|
|
|
static $str_kex_algorithms, $str_server_host_key_algorithms,
|
|
$encryption_algorithms_server_to_client, $mac_algorithms_server_to_client, $compression_algorithms_server_to_client,
|
|
$encryption_algorithms_client_to_server, $mac_algorithms_client_to_server, $compression_algorithms_client_to_server;
|
|
|
|
if (empty($str_kex_algorithms)) {
|
|
$str_kex_algorithms = implode(',', $kex_algorithms);
|
|
$str_server_host_key_algorithms = implode(',', $server_host_key_algorithms);
|
|
$encryption_algorithms_server_to_client = $encryption_algorithms_client_to_server = implode(',', $encryption_algorithms);
|
|
$mac_algorithms_server_to_client = $mac_algorithms_client_to_server = implode(',', $mac_algorithms);
|
|
$compression_algorithms_server_to_client = $compression_algorithms_client_to_server = implode(',', $compression_algorithms);
|
|
}
|
|
|
|
$client_cookie = '';
|
|
for ($i = 0; $i < 16; $i++) {
|
|
$client_cookie.= chr(crypt_random(0, 255));
|
|
}
|
|
|
|
$response = $kexinit_payload_server;
|
|
$this->_string_shift($response, 1); // skip past the message number (it should be SSH_MSG_KEXINIT)
|
|
$server_cookie = $this->_string_shift($response, 16);
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->kex_algorithms = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->server_host_key_algorithms = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->encryption_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->encryption_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->mac_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->mac_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->compression_algorithms_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->compression_algorithms_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->languages_client_to_server = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->languages_server_to_client = explode(',', $this->_string_shift($response, $temp['length']));
|
|
|
|
extract(unpack('Cfirst_kex_packet_follows', $this->_string_shift($response, 1)));
|
|
$first_kex_packet_follows = $first_kex_packet_follows != 0;
|
|
|
|
// the sending of SSH2_MSG_KEXINIT could go in one of two places. this is the second place.
|
|
$kexinit_payload_client = pack('Ca*Na*Na*Na*Na*Na*Na*Na*Na*Na*Na*CN',
|
|
NET_SSH2_MSG_KEXINIT, $client_cookie, strlen($str_kex_algorithms), $str_kex_algorithms,
|
|
strlen($str_server_host_key_algorithms), $str_server_host_key_algorithms, strlen($encryption_algorithms_client_to_server),
|
|
$encryption_algorithms_client_to_server, strlen($encryption_algorithms_server_to_client), $encryption_algorithms_server_to_client,
|
|
strlen($mac_algorithms_client_to_server), $mac_algorithms_client_to_server, strlen($mac_algorithms_server_to_client),
|
|
$mac_algorithms_server_to_client, strlen($compression_algorithms_client_to_server), $compression_algorithms_client_to_server,
|
|
strlen($compression_algorithms_server_to_client), $compression_algorithms_server_to_client, 0, '', 0, '',
|
|
0, 0
|
|
);
|
|
|
|
if (!$this->_send_binary_packet($kexinit_payload_client)) {
|
|
return false;
|
|
}
|
|
// here ends the second place.
|
|
|
|
// we need to decide upon the symmetric encryption algorithms before we do the diffie-hellman key exchange
|
|
for ($i = 0; $i < count($encryption_algorithms) && !in_array($encryption_algorithms[$i], $this->encryption_algorithms_server_to_client); $i++);
|
|
if ($i == count($encryption_algorithms)) {
|
|
user_error('No compatible server to client encryption algorithms found', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
// we don't initialize any crypto-objects, yet - we do that, later. for now, we need the lengths to make the
|
|
// diffie-hellman key exchange as fast as possible
|
|
$decrypt = $encryption_algorithms[$i];
|
|
switch ($decrypt) {
|
|
case '3des-cbc':
|
|
case '3des-ctr':
|
|
$decryptKeyLength = 24; // eg. 192 / 8
|
|
break;
|
|
case 'aes256-cbc':
|
|
case 'aes256-ctr':
|
|
$decryptKeyLength = 32; // eg. 256 / 8
|
|
break;
|
|
case 'aes192-cbc':
|
|
case 'aes192-ctr':
|
|
$decryptKeyLength = 24; // eg. 192 / 8
|
|
break;
|
|
case 'aes128-cbc':
|
|
case 'aes128-ctr':
|
|
$decryptKeyLength = 16; // eg. 128 / 8
|
|
break;
|
|
case 'arcfour':
|
|
case 'arcfour128':
|
|
$decryptKeyLength = 16; // eg. 128 / 8
|
|
break;
|
|
case 'arcfour256':
|
|
$decryptKeyLength = 32; // eg. 128 / 8
|
|
break;
|
|
case 'none';
|
|
$decryptKeyLength = 0;
|
|
}
|
|
|
|
for ($i = 0; $i < count($encryption_algorithms) && !in_array($encryption_algorithms[$i], $this->encryption_algorithms_client_to_server); $i++);
|
|
if ($i == count($encryption_algorithms)) {
|
|
user_error('No compatible client to server encryption algorithms found', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
$encrypt = $encryption_algorithms[$i];
|
|
switch ($encrypt) {
|
|
case '3des-cbc':
|
|
case '3des-ctr':
|
|
$encryptKeyLength = 24;
|
|
break;
|
|
case 'aes256-cbc':
|
|
case 'aes256-ctr':
|
|
$encryptKeyLength = 32;
|
|
break;
|
|
case 'aes192-cbc':
|
|
case 'aes192-ctr':
|
|
$encryptKeyLength = 24;
|
|
break;
|
|
case 'aes128-cbc':
|
|
case 'aes128-ctr':
|
|
$encryptKeyLength = 16;
|
|
break;
|
|
case 'arcfour':
|
|
case 'arcfour128':
|
|
$encryptKeyLength = 16;
|
|
break;
|
|
case 'arcfour256':
|
|
$encryptKeyLength = 32;
|
|
break;
|
|
case 'none';
|
|
$encryptKeyLength = 0;
|
|
}
|
|
|
|
$keyLength = $decryptKeyLength > $encryptKeyLength ? $decryptKeyLength : $encryptKeyLength;
|
|
|
|
// through diffie-hellman key exchange a symmetric key is obtained
|
|
for ($i = 0; $i < count($kex_algorithms) && !in_array($kex_algorithms[$i], $this->kex_algorithms); $i++);
|
|
if ($i == count($kex_algorithms)) {
|
|
user_error('No compatible key exchange algorithms found', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
switch ($kex_algorithms[$i]) {
|
|
// see http://tools.ietf.org/html/rfc2409#section-6.2 and
|
|
// http://tools.ietf.org/html/rfc2412, appendex E
|
|
case 'diffie-hellman-group1-sha1':
|
|
$p = pack('H256', 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
|
|
'020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
|
|
'4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
|
|
'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF');
|
|
$keyLength = $keyLength < 160 ? $keyLength : 160;
|
|
$hash = 'sha1';
|
|
break;
|
|
// see http://tools.ietf.org/html/rfc3526#section-3
|
|
case 'diffie-hellman-group14-sha1':
|
|
$p = pack('H512', 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
|
|
'020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
|
|
'4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
|
|
'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
|
|
'98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
|
|
'9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
|
|
'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
|
|
'3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF');
|
|
$keyLength = $keyLength < 160 ? $keyLength : 160;
|
|
$hash = 'sha1';
|
|
}
|
|
|
|
$p = new Math_BigInteger($p, 256);
|
|
//$q = $p->bitwise_rightShift(1);
|
|
|
|
/* To increase the speed of the key exchange, both client and server may
|
|
reduce the size of their private exponents. It should be at least
|
|
twice as long as the key material that is generated from the shared
|
|
secret. For more details, see the paper by van Oorschot and Wiener
|
|
[VAN-OORSCHOT].
|
|
|
|
-- http://tools.ietf.org/html/rfc4419#section-6.2 */
|
|
$q = new Math_BigInteger(1);
|
|
$q = $q->bitwise_leftShift(2 * $keyLength);
|
|
$q = $q->subtract(new Math_BigInteger(1));
|
|
|
|
$g = new Math_BigInteger(2);
|
|
$x = new Math_BigInteger();
|
|
$x->setRandomGenerator('crypt_random');
|
|
$x = $x->random(new Math_BigInteger(1), $q);
|
|
$e = $g->modPow($x, $p);
|
|
|
|
$eBytes = $e->toBytes(true);
|
|
$data = pack('CNa*', NET_SSH2_MSG_KEXDH_INIT, strlen($eBytes), $eBytes);
|
|
|
|
if (!$this->_send_binary_packet($data)) {
|
|
user_error('Connection closed by server', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
if ($type != NET_SSH2_MSG_KEXDH_REPLY) {
|
|
user_error('Expected SSH_MSG_KEXDH_REPLY', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->server_public_host_key = $server_public_host_key = $this->_string_shift($response, $temp['length']);
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
|
|
$public_key_format = $this->_string_shift($server_public_host_key, $temp['length']);
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$fBytes = $this->_string_shift($response, $temp['length']);
|
|
$f = new Math_BigInteger($fBytes, -256);
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($response, 4));
|
|
$this->signature = $this->_string_shift($response, $temp['length']);
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($this->signature, 4));
|
|
$this->signature_format = $this->_string_shift($this->signature, $temp['length']);
|
|
|
|
$key = $f->modPow($x, $p);
|
|
$keyBytes = $key->toBytes(true);
|
|
|
|
if ($this->session_id === false) {
|
|
$source = pack('Na*Na*Na*Na*Na*Na*Na*Na*',
|
|
strlen($this->identifier), $this->identifier, strlen($this->server_identifier), $this->server_identifier,
|
|
strlen($kexinit_payload_client), $kexinit_payload_client, strlen($kexinit_payload_server),
|
|
$kexinit_payload_server, strlen($this->server_public_host_key), $this->server_public_host_key, strlen($eBytes),
|
|
$eBytes, strlen($fBytes), $fBytes, strlen($keyBytes), $keyBytes
|
|
);
|
|
|
|
$source = pack('H*', $hash($source));
|
|
|
|
$this->session_id = $source;
|
|
}
|
|
|
|
for ($i = 0; $i < count($server_host_key_algorithms) && !in_array($server_host_key_algorithms[$i], $this->server_host_key_algorithms); $i++);
|
|
if ($i == count($server_host_key_algorithms)) {
|
|
user_error('No compatible server host key algorithms found', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
if ($public_key_format != $server_host_key_algorithms[$i] || $this->signature_format != $server_host_key_algorithms[$i]) {
|
|
user_error('Sever Host Key Algorithm Mismatch', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
$packet = pack('C',
|
|
NET_SSH2_MSG_NEWKEYS
|
|
);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
|
|
if ($response === false) {
|
|
user_error('Connection closed by server', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
if ($type != NET_SSH2_MSG_NEWKEYS) {
|
|
user_error('Expected SSH_MSG_NEWKEYS', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
switch ($encrypt) {
|
|
case '3des-cbc':
|
|
$this->encrypt = new Crypt_TripleDES();
|
|
// $this->encrypt_block_size = 64 / 8 == the default
|
|
break;
|
|
case '3des-ctr':
|
|
$this->encrypt = new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
|
|
// $this->encrypt_block_size = 64 / 8 == the default
|
|
break;
|
|
case 'aes256-cbc':
|
|
case 'aes192-cbc':
|
|
case 'aes128-cbc':
|
|
$this->encrypt = new Crypt_AES();
|
|
$this->encrypt_block_size = 16; // eg. 128 / 8
|
|
break;
|
|
case 'aes256-ctr':
|
|
case 'aes192-ctr':
|
|
case 'aes128-ctr':
|
|
$this->encrypt = new Crypt_AES(CRYPT_AES_MODE_CTR);
|
|
$this->encrypt_block_size = 16; // eg. 128 / 8
|
|
break;
|
|
case 'arcfour':
|
|
case 'arcfour128':
|
|
case 'arcfour256':
|
|
$this->encrypt = new Crypt_RC4();
|
|
break;
|
|
case 'none';
|
|
//$this->encrypt = new Crypt_Null();
|
|
}
|
|
|
|
switch ($decrypt) {
|
|
case '3des-cbc':
|
|
$this->decrypt = new Crypt_TripleDES();
|
|
break;
|
|
case '3des-ctr':
|
|
$this->decrypt = new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
|
|
break;
|
|
case 'aes256-cbc':
|
|
case 'aes192-cbc':
|
|
case 'aes128-cbc':
|
|
$this->decrypt = new Crypt_AES();
|
|
$this->decrypt_block_size = 16;
|
|
break;
|
|
case 'aes256-ctr':
|
|
case 'aes192-ctr':
|
|
case 'aes128-ctr':
|
|
$this->decrypt = new Crypt_AES(CRYPT_AES_MODE_CTR);
|
|
$this->decrypt_block_size = 16;
|
|
break;
|
|
case 'arcfour':
|
|
case 'arcfour128':
|
|
case 'arcfour256':
|
|
$this->decrypt = new Crypt_RC4();
|
|
break;
|
|
case 'none';
|
|
//$this->decrypt = new Crypt_Null();
|
|
}
|
|
|
|
$keyBytes = pack('Na*', strlen($keyBytes), $keyBytes);
|
|
|
|
if ($this->encrypt) {
|
|
$this->encrypt->enableContinuousBuffer();
|
|
$this->encrypt->disablePadding();
|
|
|
|
$iv = pack('H*', $hash($keyBytes . $this->session_id . 'A' . $this->session_id));
|
|
while ($this->encrypt_block_size > strlen($iv)) {
|
|
$iv.= pack('H*', $hash($keyBytes . $this->session_id . $iv));
|
|
}
|
|
$this->encrypt->setIV(substr($iv, 0, $this->encrypt_block_size));
|
|
|
|
$key = pack('H*', $hash($keyBytes . $this->session_id . 'C' . $this->session_id));
|
|
while ($encryptKeyLength > strlen($key)) {
|
|
$key.= pack('H*', $hash($keyBytes . $this->session_id . $key));
|
|
}
|
|
$this->encrypt->setKey(substr($key, 0, $encryptKeyLength));
|
|
}
|
|
|
|
if ($this->decrypt) {
|
|
$this->decrypt->enableContinuousBuffer();
|
|
$this->decrypt->disablePadding();
|
|
|
|
$iv = pack('H*', $hash($keyBytes . $this->session_id . 'B' . $this->session_id));
|
|
while ($this->decrypt_block_size > strlen($iv)) {
|
|
$iv.= pack('H*', $hash($keyBytes . $this->session_id . $iv));
|
|
}
|
|
$this->decrypt->setIV(substr($iv, 0, $this->decrypt_block_size));
|
|
|
|
$key = pack('H*', $hash($keyBytes . $this->session_id . 'D' . $this->session_id));
|
|
while ($decryptKeyLength > strlen($key)) {
|
|
$key.= pack('H*', $hash($keyBytes . $this->session_id . $key));
|
|
}
|
|
$this->decrypt->setKey(substr($key, 0, $decryptKeyLength));
|
|
}
|
|
|
|
/* The "arcfour128" algorithm is the RC4 cipher, as described in
|
|
[SCHNEIER], using a 128-bit key. The first 1536 bytes of keystream
|
|
generated by the cipher MUST be discarded, and the first byte of the
|
|
first encrypted packet MUST be encrypted using the 1537th byte of
|
|
keystream.
|
|
|
|
-- http://tools.ietf.org/html/rfc4345#section-4 */
|
|
if ($encrypt == 'arcfour128' || $encrypt == 'arcfour256') {
|
|
$this->encrypt->encrypt(str_repeat("\0", 1536));
|
|
}
|
|
if ($decrypt == 'arcfour128' || $decrypt == 'arcfour256') {
|
|
$this->decrypt->decrypt(str_repeat("\0", 1536));
|
|
}
|
|
|
|
for ($i = 0; $i < count($mac_algorithms) && !in_array($mac_algorithms[$i], $this->mac_algorithms_client_to_server); $i++);
|
|
if ($i == count($mac_algorithms)) {
|
|
user_error('No compatible client to server message authentication algorithms found', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
$createKeyLength = 0; // ie. $mac_algorithms[$i] == 'none'
|
|
switch ($mac_algorithms[$i]) {
|
|
case 'hmac-sha1':
|
|
$this->hmac_create = new Crypt_Hash('sha1');
|
|
$createKeyLength = 20;
|
|
break;
|
|
case 'hmac-sha1-96':
|
|
$this->hmac_create = new Crypt_Hash('sha1-96');
|
|
$createKeyLength = 20;
|
|
break;
|
|
case 'hmac-md5':
|
|
$this->hmac_create = new Crypt_Hash('md5');
|
|
$createKeyLength = 16;
|
|
break;
|
|
case 'hmac-md5-96':
|
|
$this->hmac_create = new Crypt_Hash('md5-96');
|
|
$createKeyLength = 16;
|
|
}
|
|
|
|
for ($i = 0; $i < count($mac_algorithms) && !in_array($mac_algorithms[$i], $this->mac_algorithms_server_to_client); $i++);
|
|
if ($i == count($mac_algorithms)) {
|
|
user_error('No compatible server to client message authentication algorithms found', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
$checkKeyLength = 0;
|
|
$this->hmac_size = 0;
|
|
switch ($mac_algorithms[$i]) {
|
|
case 'hmac-sha1':
|
|
$this->hmac_check = new Crypt_Hash('sha1');
|
|
$checkKeyLength = 20;
|
|
$this->hmac_size = 20;
|
|
break;
|
|
case 'hmac-sha1-96':
|
|
$this->hmac_check = new Crypt_Hash('sha1-96');
|
|
$checkKeyLength = 20;
|
|
$this->hmac_size = 12;
|
|
break;
|
|
case 'hmac-md5':
|
|
$this->hmac_check = new Crypt_Hash('md5');
|
|
$checkKeyLength = 16;
|
|
$this->hmac_size = 16;
|
|
break;
|
|
case 'hmac-md5-96':
|
|
$this->hmac_check = new Crypt_Hash('md5-96');
|
|
$checkKeyLength = 16;
|
|
$this->hmac_size = 12;
|
|
}
|
|
|
|
$key = pack('H*', $hash($keyBytes . $this->session_id . 'E' . $this->session_id));
|
|
while ($createKeyLength > strlen($key)) {
|
|
$key.= pack('H*', $hash($keyBytes . $this->session_id . $key));
|
|
}
|
|
$this->hmac_create->setKey(substr($key, 0, $createKeyLength));
|
|
|
|
$key = pack('H*', $hash($keyBytes . $this->session_id . 'F' . $this->session_id));
|
|
while ($checkKeyLength > strlen($key)) {
|
|
$key.= pack('H*', $hash($keyBytes . $this->session_id . $key));
|
|
}
|
|
$this->hmac_check->setKey(substr($key, 0, $checkKeyLength));
|
|
|
|
for ($i = 0; $i < count($compression_algorithms) && !in_array($compression_algorithms[$i], $this->compression_algorithms_server_to_client); $i++);
|
|
if ($i == count($compression_algorithms)) {
|
|
user_error('No compatible server to client compression algorithms found', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
$this->decompress = $compression_algorithms[$i] == 'zlib';
|
|
|
|
for ($i = 0; $i < count($compression_algorithms) && !in_array($compression_algorithms[$i], $this->compression_algorithms_client_to_server); $i++);
|
|
if ($i == count($compression_algorithms)) {
|
|
user_error('No compatible client to server compression algorithms found', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
$this->compress = $compression_algorithms[$i] == 'zlib';
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Login
|
|
*
|
|
* @param String $username
|
|
* @param optional String $password
|
|
* @return Boolean
|
|
* @access public
|
|
* @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis}
|
|
* by sending dummy SSH_MSG_IGNORE messages.
|
|
*/
|
|
function login($username, $password = '')
|
|
{
|
|
if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) {
|
|
return false;
|
|
}
|
|
|
|
$packet = pack('CNa*',
|
|
NET_SSH2_MSG_SERVICE_REQUEST, strlen('ssh-userauth'), 'ssh-userauth'
|
|
);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
if ($type != NET_SSH2_MSG_SERVICE_ACCEPT) {
|
|
user_error('Expected SSH_MSG_SERVICE_ACCEPT', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
// although PHP5's get_class() preserves the case, PHP4's does not
|
|
if (is_object($password) && strtolower(get_class($password)) == 'crypt_rsa') {
|
|
return $this->_privatekey_login($username, $password);
|
|
}
|
|
|
|
$utf8_password = utf8_encode($password);
|
|
$packet = pack('CNa*Na*Na*CNa*',
|
|
NET_SSH2_MSG_USERAUTH_REQUEST, strlen($username), $username, strlen('ssh-connection'), 'ssh-connection',
|
|
strlen('password'), 'password', 0, strlen($utf8_password), $utf8_password
|
|
);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
// remove the username and password from the last logged packet
|
|
if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) {
|
|
$packet = pack('CNa*Na*Na*CNa*',
|
|
NET_SSH2_MSG_USERAUTH_REQUEST, strlen('username'), 'username', strlen('ssh-connection'), 'ssh-connection',
|
|
strlen('password'), 'password', 0, strlen('password'), 'password'
|
|
);
|
|
$this->message_log[count($this->message_log) - 1] = $packet;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ: // in theory, the password can be changed
|
|
if (defined('NET_SSH2_LOGGING')) {
|
|
$this->message_number_log[count($this->message_number_log) - 1] = 'NET_SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ';
|
|
}
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
$this->errors[] = 'SSH_MSG_USERAUTH_PASSWD_CHANGEREQ: ' . utf8_decode($this->_string_shift($response, $length));
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER);
|
|
case NET_SSH2_MSG_USERAUTH_FAILURE:
|
|
// either the login is bad or the server employees multi-factor authentication
|
|
return false;
|
|
case NET_SSH2_MSG_USERAUTH_SUCCESS:
|
|
$this->bitmap |= NET_SSH2_MASK_LOGIN;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Login with an RSA private key
|
|
*
|
|
* @param String $username
|
|
* @param Crypt_RSA $password
|
|
* @return Boolean
|
|
* @access private
|
|
* @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis}
|
|
* by sending dummy SSH_MSG_IGNORE messages.
|
|
*/
|
|
function _privatekey_login($username, $privatekey)
|
|
{
|
|
// see http://tools.ietf.org/html/rfc4253#page-15
|
|
$publickey = $privatekey->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_RAW);
|
|
if ($publickey === false) {
|
|
return false;
|
|
}
|
|
|
|
$publickey = array(
|
|
'e' => $publickey['e']->toBytes(true),
|
|
'n' => $publickey['n']->toBytes(true)
|
|
);
|
|
$publickey = pack('Na*Na*Na*',
|
|
strlen('ssh-rsa'), 'ssh-rsa', strlen($publickey['e']), $publickey['e'], strlen($publickey['n']), $publickey['n']
|
|
);
|
|
|
|
$part1 = pack('CNa*Na*Na*',
|
|
NET_SSH2_MSG_USERAUTH_REQUEST, strlen($username), $username, strlen('ssh-connection'), 'ssh-connection',
|
|
strlen('publickey'), 'publickey'
|
|
);
|
|
$part2 = pack('Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publickey), $publickey);
|
|
|
|
$packet = $part1 . chr(0) . $part2;
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_USERAUTH_FAILURE:
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
$this->errors[] = 'SSH_MSG_USERAUTH_FAILURE: ' . $this->_string_shift($response, $length);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER);
|
|
case NET_SSH2_MSG_USERAUTH_PK_OK:
|
|
// we'll just take it on faith that the public key blob and the public key algorithm name are as
|
|
// they should be
|
|
if (defined('NET_SSH2_LOGGING')) {
|
|
$this->message_number_log[count($this->message_number_log) - 1] = 'NET_SSH2_MSG_USERAUTH_PK_OK';
|
|
}
|
|
}
|
|
|
|
$packet = $part1 . chr(1) . $part2;
|
|
$privatekey->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
|
|
$signature = $privatekey->sign(pack('Na*a*', strlen($this->session_id), $this->session_id, $packet));
|
|
$signature = pack('Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($signature), $signature);
|
|
$packet.= pack('Na*', strlen($signature), $signature);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_USERAUTH_FAILURE:
|
|
// either the login is bad or the server employees multi-factor authentication
|
|
return false;
|
|
case NET_SSH2_MSG_USERAUTH_SUCCESS:
|
|
$this->bitmap |= NET_SSH2_MASK_LOGIN;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Execute Command
|
|
*
|
|
* @param String $command
|
|
* @return String
|
|
* @access public
|
|
*/
|
|
function exec($command)
|
|
{
|
|
if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
|
|
return false;
|
|
}
|
|
|
|
// RFC4254 defines the (client) window size as "bytes the other party can send before it must wait for the window to
|
|
// be adjusted". 0x7FFFFFFF is, at 4GB, the max size. technically, it should probably be decremented, but,
|
|
// honestly, if you're transfering more than 4GB, you probably shouldn't be using phpseclib, anyway.
|
|
// see http://tools.ietf.org/html/rfc4254#section-5.2 for more info
|
|
$this->window_size_client_to_server[NET_SSH2_CHANNEL_EXEC] = 0x7FFFFFFF;
|
|
// 0x8000 is the maximum max packet size, per http://tools.ietf.org/html/rfc4253#section-6.1, although since PuTTy
|
|
// uses 0x4000, that's what will be used here, as well.
|
|
$packet_size = 0x4000;
|
|
|
|
$packet = pack('CNa*N3',
|
|
NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SSH2_CHANNEL_EXEC, $this->window_size_client_to_server[NET_SSH2_CHANNEL_EXEC], $packet_size);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_OPEN;
|
|
|
|
$response = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
|
|
if ($response === false) {
|
|
return false;
|
|
}
|
|
|
|
// sending a pty-req SSH_MSG_CHANNEL_REQUEST message is unnecessary and, in fact, in most cases, slows things
|
|
// down. the one place where it might be desirable is if you're doing something like Net_SSH2::exec('ping localhost &').
|
|
// with a pty-req SSH_MSG_cHANNEL_REQUEST, exec() will return immediately and the ping process will then
|
|
// then immediately terminate. without such a request exec() will loop indefinitely. the ping process won't end but
|
|
// neither will your script.
|
|
|
|
// although, in theory, the size of SSH_MSG_CHANNEL_REQUEST could exceed the maximum packet size established by
|
|
// SSH_MSG_CHANNEL_OPEN_CONFIRMATION, RFC4254#section-5.1 states that the "maximum packet size" refers to the
|
|
// "maximum size of an individual data packet". ie. SSH_MSG_CHANNEL_DATA. RFC4254#section-5.2 corroborates.
|
|
$packet = pack('CNNa*CNa*',
|
|
NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SSH2_CHANNEL_EXEC], strlen('exec'), 'exec', 1, strlen($command), $command);
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_REQUEST;
|
|
|
|
$response = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
|
|
if ($response === false) {
|
|
return false;
|
|
}
|
|
|
|
$this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_DATA;
|
|
|
|
$output = '';
|
|
while (true) {
|
|
$temp = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
|
|
switch (true) {
|
|
case $temp === true:
|
|
return $output;
|
|
case $temp === false:
|
|
return false;
|
|
default:
|
|
$output.= $temp;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Disconnect
|
|
*
|
|
* @access public
|
|
*/
|
|
function disconnect()
|
|
{
|
|
$this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
}
|
|
|
|
/**
|
|
* Destructor.
|
|
*
|
|
* Will be called, automatically, if you're supporting just PHP5. If you're supporting PHP4, you'll need to call
|
|
* disconnect().
|
|
*
|
|
* @access public
|
|
*/
|
|
function __destruct()
|
|
{
|
|
$this->disconnect();
|
|
}
|
|
|
|
/**
|
|
* Gets Binary Packets
|
|
*
|
|
* See '6. Binary Packet Protocol' of rfc4253 for more info.
|
|
*
|
|
* @see Net_SSH2::_send_binary_packet()
|
|
* @return String
|
|
* @access private
|
|
*/
|
|
function _get_binary_packet()
|
|
{
|
|
if (feof($this->fsock)) {
|
|
user_error('Connection closed prematurely', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
|
|
$raw = fread($this->fsock, $this->decrypt_block_size);
|
|
$stop = strtok(microtime(), ' ') + strtok('');
|
|
|
|
if ($this->decrypt !== false) {
|
|
$raw = $this->decrypt->decrypt($raw);
|
|
}
|
|
|
|
extract(unpack('Npacket_length/Cpadding_length', $this->_string_shift($raw, 5)));
|
|
|
|
$remaining_length = $packet_length + 4 - $this->decrypt_block_size;
|
|
$buffer = '';
|
|
while ($remaining_length > 0) {
|
|
$temp = fread($this->fsock, $remaining_length);
|
|
$buffer.= $temp;
|
|
$remaining_length-= strlen($temp);
|
|
}
|
|
if (!empty($buffer)) {
|
|
$raw.= $this->decrypt !== false ? $this->decrypt->decrypt($buffer) : $buffer;
|
|
$buffer = $temp = '';
|
|
}
|
|
|
|
$payload = $this->_string_shift($raw, $packet_length - $padding_length - 1);
|
|
$padding = $this->_string_shift($raw, $padding_length); // should leave $raw empty
|
|
|
|
if ($this->hmac_check !== false) {
|
|
$hmac = fread($this->fsock, $this->hmac_size);
|
|
if ($hmac != $this->hmac_check->hash(pack('NNCa*', $this->get_seq_no, $packet_length, $padding_length, $payload . $padding))) {
|
|
user_error('Invalid HMAC', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
//if ($this->decompress) {
|
|
// $payload = gzinflate(substr($payload, 2));
|
|
//}
|
|
|
|
$this->get_seq_no++;
|
|
|
|
if (defined('NET_SSH2_LOGGING')) {
|
|
$temp = isset($this->message_numbers[ord($payload[0])]) ? $this->message_numbers[ord($payload[0])] : 'UNKNOWN';
|
|
$this->message_number_log[] = '<- ' . $temp .
|
|
' (' . round($stop - $start, 4) . 's)';
|
|
if (NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) {
|
|
$this->message_log[] = substr($payload, 1);
|
|
}
|
|
}
|
|
|
|
return $this->_filter($payload);
|
|
}
|
|
|
|
/**
|
|
* Filter Binary Packets
|
|
*
|
|
* Because some binary packets need to be ignored...
|
|
*
|
|
* @see Net_SSH2::_get_binary_packet()
|
|
* @return String
|
|
* @access private
|
|
*/
|
|
function _filter($payload)
|
|
{
|
|
switch (ord($payload[0])) {
|
|
case NET_SSH2_MSG_DISCONNECT:
|
|
$this->_string_shift($payload, 1);
|
|
extract(unpack('Nreason_code/Nlength', $this->_string_shift($payload, 8)));
|
|
$this->errors[] = 'SSH_MSG_DISCONNECT: ' . $this->disconnect_reasons[$reason_code] . "\r\n" . utf8_decode($this->_string_shift($payload, $length));
|
|
$this->bitmask = 0;
|
|
return false;
|
|
case NET_SSH2_MSG_IGNORE:
|
|
$payload = $this->_get_binary_packet();
|
|
break;
|
|
case NET_SSH2_MSG_DEBUG:
|
|
$this->_string_shift($payload, 2);
|
|
extract(unpack('Nlength', $this->_string_shift($payload, 4)));
|
|
$this->errors[] = 'SSH_MSG_DEBUG: ' . utf8_decode($this->_string_shift($payload, $length));
|
|
$payload = $this->_get_binary_packet();
|
|
break;
|
|
case NET_SSH2_MSG_UNIMPLEMENTED:
|
|
return false;
|
|
case NET_SSH2_MSG_KEXINIT:
|
|
if ($this->session_id !== false) {
|
|
if (!$this->_key_exchange($payload)) {
|
|
$this->bitmask = 0;
|
|
return false;
|
|
}
|
|
$payload = $this->_get_binary_packet();
|
|
}
|
|
}
|
|
|
|
// see http://tools.ietf.org/html/rfc4252#section-5.4; only called when the encryption has been activated and when we haven't already logged in
|
|
if (($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR) && !($this->bitmap & NET_SSH2_MASK_LOGIN) && ord($payload[0]) == NET_SSH2_MSG_USERAUTH_BANNER) {
|
|
$this->_string_shift($payload, 1);
|
|
extract(unpack('Nlength', $this->_string_shift($payload, 4)));
|
|
$this->errors[] = 'SSH_MSG_USERAUTH_BANNER: ' . utf8_decode($this->_string_shift($payload, $length));
|
|
$payload = $this->_get_binary_packet();
|
|
}
|
|
|
|
// only called when we've already logged in
|
|
if (($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR) && ($this->bitmap & NET_SSH2_MASK_LOGIN)) {
|
|
switch (ord($payload[0])) {
|
|
case NET_SSH2_MSG_GLOBAL_REQUEST: // see http://tools.ietf.org/html/rfc4254#section-4
|
|
$this->_string_shift($payload, 1);
|
|
extract(unpack('Nlength', $this->_string_shift($payload)));
|
|
$this->errors[] = 'SSH_MSG_GLOBAL_REQUEST: ' . utf8_decode($this->_string_shift($payload, $length));
|
|
|
|
if (!$this->_send_binary_packet(pack('C', NET_SSH2_MSG_REQUEST_FAILURE))) {
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
}
|
|
|
|
$payload = $this->_get_binary_packet();
|
|
break;
|
|
case NET_SSH2_MSG_CHANNEL_OPEN: // see http://tools.ietf.org/html/rfc4254#section-5.1
|
|
$this->_string_shift($payload, 1);
|
|
extract(unpack('N', $this->_string_shift($payload, 4)));
|
|
$this->errors[] = 'SSH_MSG_CHANNEL_OPEN: ' . utf8_decode($this->_string_shift($payload, $length));
|
|
|
|
$this->_string_shift($payload, 4); // skip over client channel
|
|
extract(unpack('Nserver_channel', $this->_string_shift($payload, 4)));
|
|
|
|
$packet = pack('CN3a*Na*',
|
|
NET_SSH2_MSG_REQUEST_FAILURE, $server_channel, NET_SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED, 0, '', 0, '');
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
}
|
|
|
|
$payload = $this->_get_binary_packet();
|
|
break;
|
|
case NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST:
|
|
$payload = $this->_get_binary_packet();
|
|
}
|
|
}
|
|
|
|
return $payload;
|
|
}
|
|
|
|
/**
|
|
* Gets channel data
|
|
*
|
|
* Returns the data as a string if it's available and false if not.
|
|
*
|
|
* @param $client_channel
|
|
* @return Mixed
|
|
* @access private
|
|
*/
|
|
function _get_channel_packet($client_channel)
|
|
{
|
|
if (!empty($this->channel_buffers[$client_channel])) {
|
|
return array_shift($this->channel_buffers[$client_channel]);
|
|
}
|
|
|
|
while (true) {
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Ctype/Nchannel', $this->_string_shift($response, 5)));
|
|
|
|
switch ($this->channel_status[$channel]) {
|
|
case NET_SSH2_MSG_CHANNEL_OPEN:
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
|
|
extract(unpack('Nserver_channel', $this->_string_shift($response, 4)));
|
|
$this->server_channels[$client_channel] = $server_channel;
|
|
$this->_string_shift($response, 4); // skip over (server) window size
|
|
$temp = unpack('Npacket_size_client_to_server', $this->_string_shift($response, 4));
|
|
$this->packet_size_client_to_server[$client_channel] = $temp['packet_size_client_to_server'];
|
|
return true;
|
|
//case NET_SSH2_MSG_CHANNEL_OPEN_FAILURE:
|
|
default:
|
|
user_error('Unable to open channel', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
}
|
|
break;
|
|
case NET_SSH2_MSG_CHANNEL_REQUEST:
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_CHANNEL_SUCCESS:
|
|
return true;
|
|
//case NET_SSH2_MSG_CHANNEL_FAILURE:
|
|
default:
|
|
user_error('Unable to request pseudo-terminal', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
}
|
|
|
|
}
|
|
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_CHANNEL_DATA:
|
|
if ($client_channel == NET_SSH2_CHANNEL_EXEC) {
|
|
// SCP requires null packets, such as this, be sent. further, in the case of the ssh.com SSH server
|
|
// this actually seems to make things twice as fast. more to the point, the message right after
|
|
// SSH_MSG_CHANNEL_DATA (usually SSH_MSG_IGNORE) won't block for as long as it would have otherwise.
|
|
// in OpenSSH it slows things down but only by a couple thousandths of a second.
|
|
$this->_send_channel_packet($client_channel, chr(0));
|
|
}
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
$data = $this->_string_shift($response, $length);
|
|
if ($client_channel == $channel) {
|
|
return $data;
|
|
}
|
|
if (!isset($this->channel_buffers[$client_channel])) {
|
|
$this->channel_buffers[$client_channel] = array();
|
|
}
|
|
$this->channel_buffers[$client_channel][] = $data;
|
|
break;
|
|
case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA:
|
|
if ($client_channel == NET_SSH2_CHANNEL_EXEC) {
|
|
$this->_send_channel_packet($client_channel, chr(0));
|
|
}
|
|
// currently, there's only one possible value for $data_type_code: NET_SSH2_EXTENDED_DATA_STDERR
|
|
extract(unpack('Ndata_type_code/Nlength', $this->_string_shift($response, 8)));
|
|
$data = $this->_string_shift($response, $length);
|
|
if ($client_channel == $channel) {
|
|
return $data;
|
|
}
|
|
if (!isset($this->channel_buffers[$client_channel])) {
|
|
$this->channel_buffers[$client_channel] = array();
|
|
}
|
|
$this->channel_buffers[$client_channel][] = $data;
|
|
break;
|
|
case NET_SSH2_MSG_CHANNEL_REQUEST:
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
$value = $this->_string_shift($response, $length);
|
|
switch ($value) {
|
|
case 'exit-signal':
|
|
$this->_string_shift($response, 1);
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
$this->errors[] = 'SSH_MSG_CHANNEL_REQUEST (exit-signal): ' . $this->_string_shift($response, $length);
|
|
$this->_string_shift($response, 1);
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
if ($length) {
|
|
$this->errors[count($this->errors)].= "\r\n" . $this->_string_shift($response, $length);
|
|
}
|
|
//case 'exit-status':
|
|
default:
|
|
// "Some systems may not implement signals, in which case they SHOULD ignore this message."
|
|
// -- http://tools.ietf.org/html/rfc4254#section-6.9
|
|
break;
|
|
}
|
|
break;
|
|
case NET_SSH2_MSG_CHANNEL_CLOSE:
|
|
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));
|
|
return true;
|
|
case NET_SSH2_MSG_CHANNEL_EOF:
|
|
break;
|
|
default:
|
|
user_error('Error reading channel data', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sends Binary Packets
|
|
*
|
|
* See '6. Binary Packet Protocol' of rfc4253 for more info.
|
|
*
|
|
* @param String $data
|
|
* @see Net_SSH2::_get_binary_packet()
|
|
* @return Boolean
|
|
* @access private
|
|
*/
|
|
function _send_binary_packet($data)
|
|
{
|
|
if (feof($this->fsock)) {
|
|
user_error('Connection closed prematurely', E_USER_NOTICE);
|
|
return false;
|
|
}
|
|
|
|
//if ($this->compress) {
|
|
// // the -4 removes the checksum:
|
|
// // http://php.net/function.gzcompress#57710
|
|
// $data = substr(gzcompress($data), 0, -4);
|
|
//}
|
|
|
|
// 4 (packet length) + 1 (padding length) + 4 (minimal padding amount) == 9
|
|
$packet_length = strlen($data) + 9;
|
|
// round up to the nearest $this->encrypt_block_size
|
|
$packet_length+= (($this->encrypt_block_size - 1) * $packet_length) % $this->encrypt_block_size;
|
|
// subtracting strlen($data) is obvious - subtracting 5 is necessary because of packet_length and padding_length
|
|
$padding_length = $packet_length - strlen($data) - 5;
|
|
|
|
$padding = '';
|
|
for ($i = 0; $i < $padding_length; $i++) {
|
|
$padding.= chr(crypt_random(0, 255));
|
|
}
|
|
|
|
// we subtract 4 from packet_length because the packet_length field isn't supposed to include itself
|
|
$packet = pack('NCa*', $packet_length - 4, $padding_length, $data . $padding);
|
|
|
|
$hmac = $this->hmac_create !== false ? $this->hmac_create->hash(pack('Na*', $this->send_seq_no, $packet)) : '';
|
|
$this->send_seq_no++;
|
|
|
|
if ($this->encrypt !== false) {
|
|
$packet = $this->encrypt->encrypt($packet);
|
|
}
|
|
|
|
$packet.= $hmac;
|
|
|
|
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
|
|
$result = strlen($packet) == fputs($this->fsock, $packet);
|
|
$stop = strtok(microtime(), ' ') + strtok('');
|
|
|
|
if (defined('NET_SSH2_LOGGING')) {
|
|
$temp = isset($this->message_numbers[ord($data[0])]) ? $this->message_numbers[ord($data[0])] : 'UNKNOWN';
|
|
$this->message_number_log[] = '-> ' . $temp .
|
|
' (' . round($stop - $start, 4) . 's)';
|
|
if (NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) {
|
|
$this->message_log[] = substr($data, 1);
|
|
}
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Sends channel data
|
|
*
|
|
* Spans multiple SSH_MSG_CHANNEL_DATAs if appropriate
|
|
*
|
|
* @param Integer $client_channel
|
|
* @param String $data
|
|
* @return Boolean
|
|
* @access private
|
|
*/
|
|
function _send_channel_packet($client_channel, $data)
|
|
{
|
|
while (strlen($data) > $this->packet_size_client_to_server[$client_channel]) {
|
|
// resize the window, if appropriate
|
|
$this->window_size_client_to_server[$client_channel]-= $this->packet_size_client_to_server[$client_channel];
|
|
if ($this->window_size_client_to_server[$client_channel] < 0) {
|
|
$packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$client_channel], $this->window_size);
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
$this->window_size_client_to_server[$client_channel]+= $this->window_size;
|
|
}
|
|
|
|
$packet = pack('CN2a*',
|
|
NET_SSH2_MSG_CHANNEL_DATA,
|
|
$this->server_channels[$client_channel],
|
|
$this->packet_size_client_to_server[$client_channel],
|
|
$this->_string_shift($data, $this->packet_size_client_to_server[$client_channel])
|
|
);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// resize the window, if appropriate
|
|
$this->window_size_client_to_server[$client_channel]-= strlen($data);
|
|
if ($this->window_size_client_to_server[$client_channel] < 0) {
|
|
$packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$client_channel], $this->window_size);
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
$this->window_size_client_to_server[$client_channel]+= $this->window_size;
|
|
}
|
|
|
|
return $this->_send_binary_packet(pack('CN2a*',
|
|
NET_SSH2_MSG_CHANNEL_DATA,
|
|
$this->server_channels[$client_channel],
|
|
strlen($data),
|
|
$data));
|
|
}
|
|
|
|
/**
|
|
* Disconnect
|
|
*
|
|
* @param Integer $reason
|
|
* @return Boolean
|
|
* @access private
|
|
*/
|
|
function _disconnect($reason)
|
|
{
|
|
if ($this->bitmap) {
|
|
$data = pack('CNNa*Na*', NET_SSH2_MSG_DISCONNECT, $reason, 0, '', 0, '');
|
|
$this->_send_binary_packet($data);
|
|
$this->bitmap = 0;
|
|
fclose($this->fsock);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* String Shift
|
|
*
|
|
* Inspired by array_shift
|
|
*
|
|
* @param String $string
|
|
* @param optional Integer $index
|
|
* @return String
|
|
* @access private
|
|
*/
|
|
function _string_shift(&$string, $index = 1)
|
|
{
|
|
$substr = substr($string, 0, $index);
|
|
$string = substr($string, $index);
|
|
return $substr;
|
|
}
|
|
|
|
/**
|
|
* Define Array
|
|
*
|
|
* Takes any number of arrays whose indices are integers and whose values are strings and defines a bunch of
|
|
* named constants from it, using the value as the name of the constant and the index as the value of the constant.
|
|
* If any of the constants that would be defined already exists, none of the constants will be defined.
|
|
*
|
|
* @param Array $array
|
|
* @access private
|
|
*/
|
|
function _define_array()
|
|
{
|
|
$args = func_get_args();
|
|
foreach ($args as $arg) {
|
|
foreach ($arg as $key=>$value) {
|
|
if (!defined($value)) {
|
|
define($value, $key);
|
|
} else {
|
|
break 2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns a log of the packets that have been sent and received.
|
|
*
|
|
* Returns a string if NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX, an array if NET_SSH2_LOGGING == NET_SSH2_LOG_SIMPLE and false if !defined('NET_SSH2_LOGGING')
|
|
*
|
|
* @access public
|
|
* @return String or Array
|
|
*/
|
|
function getLog()
|
|
{
|
|
if (!defined('NET_SSH2_LOGGING')) {
|
|
return false;
|
|
}
|
|
|
|
switch (NET_SSH2_LOGGING) {
|
|
case NET_SSH2_LOG_SIMPLE:
|
|
return $this->message_number_log;
|
|
break;
|
|
case NET_SSH2_LOG_COMPLEX:
|
|
return $this->_format_log($this->message_log, $this->message_number_log);
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Formats a log for printing
|
|
*
|
|
* @param Array $message_log
|
|
* @param Array $message_number_log
|
|
* @access private
|
|
* @return String
|
|
*/
|
|
function _format_log($message_log, $message_number_log)
|
|
{
|
|
static $boundary = ':', $long_width = 65, $short_width = 16;
|
|
|
|
$output = '';
|
|
for ($i = 0; $i < count($message_log); $i++) {
|
|
$output.= $message_number_log[$i] . "\r\n";
|
|
$current_log = $message_log[$i];
|
|
$j = 0;
|
|
do {
|
|
if (!empty($current_log)) {
|
|
$output.= str_pad(dechex($j), 7, '0', STR_PAD_LEFT) . '0 ';
|
|
}
|
|
$fragment = $this->_string_shift($current_log, $short_width);
|
|
$hex = substr(
|
|
preg_replace(
|
|
'#(.)#es',
|
|
'"' . $boundary . '" . str_pad(dechex(ord(substr("\\1", -1))), 2, "0", STR_PAD_LEFT)',
|
|
$fragment),
|
|
strlen($boundary)
|
|
);
|
|
// replace non ASCII printable characters with dots
|
|
// http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters
|
|
// also replace < with a . since < messes up the output on web browsers
|
|
$raw = preg_replace('#[^\x20-\x7E]|<#', '.', $fragment);
|
|
$output.= str_pad($hex, $long_width - $short_width, ' ') . $raw . "\r\n";
|
|
$j++;
|
|
} while (!empty($current_log));
|
|
$output.= "\r\n";
|
|
}
|
|
|
|
return $output;
|
|
}
|
|
|
|
/**
|
|
* Returns all errors
|
|
*
|
|
* @return String
|
|
* @access public
|
|
*/
|
|
function getErrors()
|
|
{
|
|
return $this->errors;
|
|
}
|
|
|
|
/**
|
|
* Returns the last error
|
|
*
|
|
* @return String
|
|
* @access public
|
|
*/
|
|
function getLastError()
|
|
{
|
|
return $this->errors[count($this->errors) - 1];
|
|
}
|
|
|
|
/**
|
|
* Return the server identification.
|
|
*
|
|
* @return String
|
|
* @access public
|
|
*/
|
|
function getServerIdentification()
|
|
{
|
|
return $this->server_identifier;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the key exchange algorithms the server supports.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getKexAlgorithms()
|
|
{
|
|
return $this->kex_algorithms;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the host key (public key) algorithms the server supports.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getServerHostKeyAlgorithms()
|
|
{
|
|
return $this->server_host_key_algorithms;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the (symmetric key) encryption algorithms the server supports, when receiving stuff from the client.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getEncryptionAlgorithmsClient2Server()
|
|
{
|
|
return $this->encryption_algorithms_client_to_server;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the (symmetric key) encryption algorithms the server supports, when sending stuff to the client.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getEncryptionAlgorithmsServer2Client()
|
|
{
|
|
return $this->encryption_algorithms_server_to_client;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the MAC algorithms the server supports, when receiving stuff from the client.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getMACAlgorithmsClient2Server()
|
|
{
|
|
return $this->mac_algorithms_client_to_server;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the MAC algorithms the server supports, when sending stuff to the client.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getMACAlgorithmsServer2Client()
|
|
{
|
|
return $this->mac_algorithms_server_to_client;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the compression algorithms the server supports, when receiving stuff from the client.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getCompressionAlgorithmsClient2Server()
|
|
{
|
|
return $this->compression_algorithms_client_to_server;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the compression algorithms the server supports, when sending stuff to the client.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getCompressionAlgorithmsServer2Client()
|
|
{
|
|
return $this->compression_algorithms_server_to_client;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the languages the server supports, when sending stuff to the client.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getLanguagesServer2Client()
|
|
{
|
|
return $this->languages_server_to_client;
|
|
}
|
|
|
|
/**
|
|
* Return a list of the languages the server supports, when receiving stuff from the client.
|
|
*
|
|
* @return Array
|
|
* @access public
|
|
*/
|
|
function getLanguagesClient2Server()
|
|
{
|
|
return $this->languages_client_to_server;
|
|
}
|
|
|
|
/**
|
|
* Returns the server public host key.
|
|
*
|
|
* Caching this the first time you connect to a server and checking the result on subsequent connections
|
|
* is recommended. Returns false if the server signature is not signed correctly with the public host key.
|
|
*
|
|
* @return Mixed
|
|
* @access public
|
|
*/
|
|
function getServerPublicHostKey()
|
|
{
|
|
$signature = $this->signature;
|
|
$server_public_host_key = $this->server_public_host_key;
|
|
|
|
extract(unpack('Nlength', $this->_string_shift($server_public_host_key, 4)));
|
|
$this->_string_shift($server_public_host_key, $length);
|
|
|
|
switch ($this->signature_format) {
|
|
case 'ssh-dss':
|
|
$temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
|
|
$p = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
|
|
$q = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
|
|
$g = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
|
|
$y = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
|
|
|
|
/* The value for 'dss_signature_blob' is encoded as a string containing
|
|
r, followed by s (which are 160-bit integers, without lengths or
|
|
padding, unsigned, and in network byte order). */
|
|
$temp = unpack('Nlength', $this->_string_shift($signature, 4));
|
|
if ($temp['length'] != 40) {
|
|
user_error('Invalid signature', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
$r = new Math_BigInteger($this->_string_shift($signature, 20), 256);
|
|
$s = new Math_BigInteger($this->_string_shift($signature, 20), 256);
|
|
|
|
if ($r->compare($q) >= 0 || $s->compare($q) >= 0) {
|
|
user_error('Invalid signature', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
$w = $s->modInverse($q);
|
|
|
|
$u1 = $w->multiply(new Math_BigInteger(sha1($this->session_id), 16));
|
|
list(, $u1) = $u1->divide($q);
|
|
|
|
$u2 = $w->multiply($r);
|
|
list(, $u2) = $u2->divide($q);
|
|
|
|
$g = $g->modPow($u1, $p);
|
|
$y = $y->modPow($u2, $p);
|
|
|
|
$v = $g->multiply($y);
|
|
list(, $v) = $v->divide($p);
|
|
list(, $v) = $v->divide($q);
|
|
|
|
if (!$v->equals($r)) {
|
|
user_error('Bad server signature', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
|
|
}
|
|
|
|
break;
|
|
case 'ssh-rsa':
|
|
$temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
|
|
$e = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($server_public_host_key, 4));
|
|
$n = new Math_BigInteger($this->_string_shift($server_public_host_key, $temp['length']), -256);
|
|
$nLength = $temp['length'];
|
|
|
|
/*
|
|
$temp = unpack('Nlength', $this->_string_shift($signature, 4));
|
|
$signature = $this->_string_shift($signature, $temp['length']);
|
|
|
|
if (!class_exists('Crypt_RSA')) {
|
|
require_once('Crypt/RSA.php');
|
|
}
|
|
|
|
$rsa = new Crypt_RSA();
|
|
$rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1);
|
|
$rsa->loadKey(array('e' => $e, 'n' => $n), CRYPT_RSA_PUBLIC_FORMAT_RAW);
|
|
if (!$rsa->verify($this->session_id, $signature)) {
|
|
user_error('Bad server signature', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
|
|
}
|
|
*/
|
|
|
|
$temp = unpack('Nlength', $this->_string_shift($signature, 4));
|
|
$s = new Math_BigInteger($this->_string_shift($signature, $temp['length']), 256);
|
|
|
|
// validate an RSA signature per "8.2 RSASSA-PKCS1-v1_5", "5.2.2 RSAVP1", and "9.1 EMSA-PSS" in the
|
|
// following URL:
|
|
// ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1.pdf
|
|
|
|
// also, see SSHRSA.c (rsa2_verifysig) in PuTTy's source.
|
|
|
|
if ($s->compare(new Math_BigInteger()) < 0 || $s->compare($n->subtract(new Math_BigInteger(1))) > 0) {
|
|
user_error('Invalid signature', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
$s = $s->modPow($e, $n);
|
|
$s = $s->toBytes();
|
|
|
|
$h = pack('N4H*', 0x00302130, 0x0906052B, 0x0E03021A, 0x05000414, sha1($this->session_id));
|
|
$h = chr(0x01) . str_repeat(chr(0xFF), $nLength - 3 - strlen($h)) . $h;
|
|
|
|
if ($s != $h) {
|
|
user_error('Bad server signature', E_USER_NOTICE);
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
|
|
}
|
|
}
|
|
|
|
return $this->server_public_host_key;
|
|
}
|
|
} |