mirror of
https://github.com/danog/tgseclib.git
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3466 lines
123 KiB
PHP
3466 lines
123 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 $ssh->read('username@username:~$');
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* $ssh->write("ls -la\n");
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* echo $ssh->read('username@username:~$');
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* ?>
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* </code>
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*
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* LICENSE: Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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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.opensource.org/licenses/mit-license.html MIT License
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* @link http://phpseclib.sourceforge.net
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*/
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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_REQ', 0x00000002);
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define('NET_SSH2_MASK_LOGIN', 0x00000004);
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define('NET_SSH2_MASK_SHELL', 0x00000008);
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define('NET_SSH2_MASK_WINDOW_ADJUST', 0X00000010);
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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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define('NET_SSH2_CHANNEL_SHELL',1);
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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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* Outputs the content real-time
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*/
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define('NET_SSH2_LOG_REALTIME', 3);
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/**
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* Dumps the content real-time to a file
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*/
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define('NET_SSH2_LOG_REALTIME_FILE', 4);
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/**#@-*/
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/**#@+
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* @access public
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* @see Net_SSH2::read()
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*/
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/**
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* Returns when a string matching $expect exactly is found
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*/
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define('NET_SSH2_READ_SIMPLE', 1);
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/**
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* Returns when a string matching the regular expression $expect is found
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*/
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define('NET_SSH2_READ_REGEX', 2);
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/**
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* Make sure that the log never gets larger than this
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*/
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define('NET_SSH2_LOG_MAX_SIZE', 1024 * 1024);
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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_0.3';
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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 represent 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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* Exchange hash
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*
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* The current exchange hash
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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 $exchange_hash = 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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* 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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* 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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/**
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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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/**
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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 = 2GB)
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*
|
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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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/**
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* Window size, server to client
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*
|
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* Window 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 $window_size_server_to_client = array();
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|
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/**
|
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* Window size, client to server
|
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*
|
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* Window size indexed by channel
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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 $window_size_client_to_server = array();
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|
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/**
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* Server signature
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|
*
|
|
* Verified against $this->session_id
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|
*
|
|
* @see Net_SSH2::getServerPublicHostKey()
|
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* @var String
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* @access private
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*/
|
|
var $signature = '';
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|
|
/**
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* Server signature format
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|
*
|
|
* ssh-rsa or ssh-dss.
|
|
*
|
|
* @see Net_SSH2::getServerPublicHostKey()
|
|
* @var String
|
|
* @access private
|
|
*/
|
|
var $signature_format = '';
|
|
|
|
/**
|
|
* Interactive Buffer
|
|
*
|
|
* @see Net_SSH2::read()
|
|
* @var Array
|
|
* @access private
|
|
*/
|
|
var $interactiveBuffer = '';
|
|
|
|
/**
|
|
* Current log size
|
|
*
|
|
* Should never exceed NET_SSH2_LOG_MAX_SIZE
|
|
*
|
|
* @see Net_SSH2::_send_binary_packet()
|
|
* @see Net_SSH2::_get_binary_packet()
|
|
* @var Integer
|
|
* @access private
|
|
*/
|
|
var $log_size;
|
|
|
|
/**
|
|
* Timeout
|
|
*
|
|
* @see Net_SSH2::setTimeout()
|
|
* @access private
|
|
*/
|
|
var $timeout;
|
|
|
|
/**
|
|
* Current Timeout
|
|
*
|
|
* @see Net_SSH2::_get_channel_packet()
|
|
* @access private
|
|
*/
|
|
var $curTimeout;
|
|
|
|
/**
|
|
* Real-time log file pointer
|
|
*
|
|
* @see Net_SSH2::_append_log()
|
|
* @var Resource
|
|
* @access private
|
|
*/
|
|
var $realtime_log_file;
|
|
|
|
/**
|
|
* Real-time log file size
|
|
*
|
|
* @see Net_SSH2::_append_log()
|
|
* @var Integer
|
|
* @access private
|
|
*/
|
|
var $realtime_log_size;
|
|
|
|
/**
|
|
* Has the signature been validated?
|
|
*
|
|
* @see Net_SSH2::getServerPublicHostKey()
|
|
* @var Boolean
|
|
* @access private
|
|
*/
|
|
var $signature_validated = false;
|
|
|
|
/**
|
|
* Real-time log file wrap boolean
|
|
*
|
|
* @see Net_SSH2::_append_log()
|
|
* @access private
|
|
*/
|
|
var $realtime_log_wrap;
|
|
|
|
/**
|
|
* Flag to suppress stderr from output
|
|
*
|
|
* @see Net_SSH2::enableQuietMode()
|
|
* @access private
|
|
*/
|
|
var $quiet_mode = false;
|
|
|
|
/**
|
|
* Time of first network activity
|
|
*
|
|
* @access private
|
|
*/
|
|
var $last_packet;
|
|
|
|
/**
|
|
* Exit status returned from ssh if any
|
|
*
|
|
* @var Integer
|
|
* @access private
|
|
*/
|
|
var $exit_status;
|
|
|
|
/**
|
|
* Flag to request a PTY when using exec()
|
|
*
|
|
* @see Net_SSH2::enablePTY()
|
|
* @access private
|
|
*/
|
|
var $request_pty = false;
|
|
|
|
/**
|
|
* Flag set while exec() is running when using enablePTY()
|
|
*
|
|
* @access private
|
|
*/
|
|
var $in_request_pty_exec = false;
|
|
|
|
/**
|
|
* Contents of stdError
|
|
*
|
|
* @access private
|
|
*/
|
|
var $stdErrorLog;
|
|
|
|
/**
|
|
* The Last Interactive Response
|
|
*
|
|
* @see Net_SSH2::_keyboard_interactive_process()
|
|
* @access private
|
|
*/
|
|
var $last_interactive_response = '';
|
|
|
|
/**
|
|
* Keyboard Interactive Request / Responses
|
|
*
|
|
* @see Net_SSH2::_keyboard_interactive_process()
|
|
* @access private
|
|
*/
|
|
var $keyboard_requests_responses = array();
|
|
|
|
/**
|
|
* Banner Message
|
|
*
|
|
* Quoting from the RFC, "in some jurisdictions, sending a warning message before
|
|
* authentication may be relevant for getting legal protection."
|
|
*
|
|
* @see Net_SSH2::_filter()
|
|
* @see Net_SSH2::getBannerMessage()
|
|
* @access private
|
|
*/
|
|
var $banner_message = '';
|
|
|
|
/**
|
|
* Did read() timeout or return normally?
|
|
*
|
|
* @see Net_SSH2::isTimeout
|
|
* @access private
|
|
*/
|
|
var $is_timeout = false;
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
// Include Math_BigInteger
|
|
// Used to do Diffie-Hellman key exchange and DSA/RSA signature verification.
|
|
if (!class_exists('Math_BigInteger')) {
|
|
require_once('Math/BigInteger.php');
|
|
}
|
|
|
|
if (!function_exists('crypt_random_string')) {
|
|
require_once('Crypt/Random.php');
|
|
}
|
|
|
|
if (!class_exists('Crypt_Hash')) {
|
|
require_once('Crypt/Hash.php');
|
|
}
|
|
|
|
$this->last_packet = strtok(microtime(), ' ') + strtok(''); // == microtime(true) in PHP5
|
|
$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'),
|
|
array(60 => 'NET_SSH2_MSG_USERAUTH_INFO_REQUEST',
|
|
61 => 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE')
|
|
);
|
|
|
|
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
|
|
$this->fsock = @fsockopen($host, $port, $errno, $errstr, $timeout);
|
|
if (!$this->fsock) {
|
|
user_error(rtrim("Cannot connect to $host. Error $errno. $errstr"));
|
|
return;
|
|
}
|
|
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
|
|
|
|
$timeout-= $elapsed;
|
|
|
|
if ($timeout <= 0) {
|
|
user_error(rtrim("Cannot connect to $host. Timeout error"));
|
|
return;
|
|
}
|
|
|
|
$read = array($this->fsock);
|
|
$write = $except = NULL;
|
|
|
|
$sec = floor($timeout);
|
|
$usec = 1000000 * ($timeout - $sec);
|
|
|
|
// on windows this returns a "Warning: Invalid CRT parameters detected" error
|
|
// the !count() is done as a workaround for <https://bugs.php.net/42682>
|
|
if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
|
|
user_error(rtrim("Cannot connect to $host. Banner timeout"));
|
|
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);
|
|
}
|
|
|
|
if (feof($this->fsock)) {
|
|
user_error('Connection closed by server');
|
|
return false;
|
|
}
|
|
|
|
$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->_append_log('<-', $extra . $temp);
|
|
$this->_append_log('->', $this->identifier . "\r\n");
|
|
}
|
|
|
|
$this->server_identifier = trim($temp, "\r\n");
|
|
if (strlen($extra)) {
|
|
$this->errors[] = utf8_decode($extra);
|
|
}
|
|
|
|
if ($matches[1] != '1.99' && $matches[1] != '2.0') {
|
|
user_error("Cannot connect to SSH $matches[1] servers");
|
|
return;
|
|
}
|
|
|
|
fputs($this->fsock, $this->identifier . "\r\n");
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server');
|
|
return;
|
|
}
|
|
|
|
if (ord($response[0]) != NET_SSH2_MSG_KEXINIT) {
|
|
user_error('Expected SSH_MSG_KEXINIT');
|
|
return;
|
|
}
|
|
|
|
if (!$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 $encryption_algorithms = false;
|
|
if ($encryption_algorithms === false) {
|
|
$encryption_algorithms = array(
|
|
// from <http://tools.ietf.org/html/rfc4345#section-4>:
|
|
'arcfour256',
|
|
'arcfour128',
|
|
|
|
'arcfour', // OPTIONAL the ARCFOUR stream cipher with a 128-bit key
|
|
|
|
// CTR modes from <http://tools.ietf.org/html/rfc4344#section-4>:
|
|
'aes128-ctr', // RECOMMENDED AES (Rijndael) in SDCTR mode, with 128-bit key
|
|
'aes192-ctr', // RECOMMENDED AES with 192-bit key
|
|
'aes256-ctr', // RECOMMENDED AES with 256-bit key
|
|
|
|
'twofish128-ctr', // OPTIONAL Twofish in SDCTR mode, with 128-bit key
|
|
'twofish192-ctr', // OPTIONAL Twofish with 192-bit key
|
|
'twofish256-ctr', // OPTIONAL Twofish with 256-bit key
|
|
|
|
'aes128-cbc', // RECOMMENDED AES with a 128-bit key
|
|
'aes192-cbc', // OPTIONAL AES with a 192-bit key
|
|
'aes256-cbc', // OPTIONAL AES in CBC mode, with a 256-bit key
|
|
|
|
'twofish128-cbc', // OPTIONAL Twofish with a 128-bit key
|
|
'twofish192-cbc', // OPTIONAL Twofish with a 192-bit key
|
|
'twofish256-cbc',
|
|
'twofish-cbc', // OPTIONAL alias for "twofish256-cbc"
|
|
// (this is being retained for historical reasons)
|
|
|
|
'blowfish-ctr', // OPTIONAL Blowfish in SDCTR mode
|
|
|
|
'blowfish-cbc', // OPTIONAL Blowfish in CBC mode
|
|
|
|
'3des-ctr', // RECOMMENDED Three-key 3DES in SDCTR mode
|
|
|
|
'3des-cbc', // REQUIRED three-key 3DES in CBC mode
|
|
'none' // OPTIONAL no encryption; NOT RECOMMENDED
|
|
);
|
|
|
|
if (!$this->_is_includable('Crypt/RC4.php')) {
|
|
$encryption_algorithms = array_diff(
|
|
$encryption_algorithms,
|
|
array('arcfour256', 'arcfour128', 'arcfour')
|
|
);
|
|
}
|
|
if (!$this->_is_includable('Crypt/Rijndael.php')) {
|
|
$encryption_algorithms = array_diff(
|
|
$encryption_algorithms,
|
|
array('aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc')
|
|
);
|
|
}
|
|
if (!$this->_is_includable('Crypt/Twofish.php')) {
|
|
$encryption_algorithms = array_diff(
|
|
$encryption_algorithms,
|
|
array('twofish128-ctr', 'twofish192-ctr', 'twofish256-ctr', 'twofish128-cbc', 'twofish192-cbc', 'twofish256-cbc', 'twofish-cbc')
|
|
);
|
|
}
|
|
if (!$this->_is_includable('Crypt/Blowfish.php')) {
|
|
$encryption_algorithms = array_diff(
|
|
$encryption_algorithms,
|
|
array('blowfish-ctr', 'blowfish-cbc')
|
|
);
|
|
}
|
|
if (!$this->_is_includable('Crypt/TripleDES.php')) {
|
|
$encryption_algorithms = array_diff(
|
|
$encryption_algorithms,
|
|
array('3des-ctr', '3des-cbc')
|
|
);
|
|
}
|
|
$encryption_algorithms = array_values($encryption_algorithms);
|
|
}
|
|
|
|
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 $compression_algorithms = array(
|
|
'none' // REQUIRED no compression
|
|
//'zlib' // OPTIONAL ZLIB (LZ77) compression
|
|
);
|
|
|
|
// some SSH servers have buggy implementations of some of the above algorithms
|
|
switch ($this->server_identifier) {
|
|
case 'SSH-2.0-SSHD':
|
|
$mac_algorithms = array_values(array_diff(
|
|
$mac_algorithms,
|
|
array('hmac-sha1-96', 'hmac-md5-96')
|
|
));
|
|
}
|
|
|
|
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 = crypt_random_string(16);
|
|
|
|
$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');
|
|
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':
|
|
case 'twofish-cbc':
|
|
case 'twofish256-cbc':
|
|
case 'twofish256-ctr':
|
|
$decryptKeyLength = 32; // eg. 256 / 8
|
|
break;
|
|
case 'aes192-cbc':
|
|
case 'aes192-ctr':
|
|
case 'twofish192-cbc':
|
|
case 'twofish192-ctr':
|
|
$decryptKeyLength = 24; // eg. 192 / 8
|
|
break;
|
|
case 'aes128-cbc':
|
|
case 'aes128-ctr':
|
|
case 'twofish128-cbc':
|
|
case 'twofish128-ctr':
|
|
case 'blowfish-cbc':
|
|
case 'blowfish-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');
|
|
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':
|
|
case 'twofish-cbc':
|
|
case 'twofish256-cbc':
|
|
case 'twofish256-ctr':
|
|
$encryptKeyLength = 32;
|
|
break;
|
|
case 'aes192-cbc':
|
|
case 'aes192-ctr':
|
|
case 'twofish192-cbc':
|
|
case 'twofish192-ctr':
|
|
$encryptKeyLength = 24;
|
|
break;
|
|
case 'aes128-cbc':
|
|
case 'aes128-ctr':
|
|
case 'twofish128-cbc':
|
|
case 'twofish128-ctr':
|
|
case 'blowfish-cbc':
|
|
case 'blowfish-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');
|
|
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':
|
|
$prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
|
|
'020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
|
|
'4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
|
|
'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF';
|
|
break;
|
|
// see http://tools.ietf.org/html/rfc3526#section-3
|
|
case 'diffie-hellman-group14-sha1':
|
|
$prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
|
|
'020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
|
|
'4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
|
|
'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
|
|
'98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
|
|
'9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
|
|
'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
|
|
'3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF';
|
|
break;
|
|
}
|
|
|
|
// For both diffie-hellman-group1-sha1 and diffie-hellman-group14-sha1
|
|
// the generator field element is 2 (decimal) and the hash function is sha1.
|
|
$g = new Math_BigInteger(2);
|
|
$prime = new Math_BigInteger($prime, 16);
|
|
$kexHash = new Crypt_Hash('sha1');
|
|
//$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 */
|
|
$one = new Math_BigInteger(1);
|
|
$keyLength = min($keyLength, $kexHash->getLength());
|
|
$max = $one->bitwise_leftShift(16 * $keyLength)->subtract($one); // 2 * 8 * $keyLength
|
|
|
|
$x = $one->random($one, $max);
|
|
$e = $g->modPow($x, $prime);
|
|
|
|
$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');
|
|
return false;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server');
|
|
return false;
|
|
}
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
if ($type != NET_SSH2_MSG_KEXDH_REPLY) {
|
|
user_error('Expected SSH_MSG_KEXDH_REPLY');
|
|
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, $prime);
|
|
$keyBytes = $key->toBytes(true);
|
|
|
|
$this->exchange_hash = pack('Na*Na*Na*Na*Na*Na*Na*Na*',
|
|
strlen($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
|
|
);
|
|
|
|
$this->exchange_hash = $kexHash->hash($this->exchange_hash);
|
|
|
|
if ($this->session_id === false) {
|
|
$this->session_id = $this->exchange_hash;
|
|
}
|
|
|
|
for ($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');
|
|
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('Server Host Key Algorithm Mismatch');
|
|
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');
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
if ($type != NET_SSH2_MSG_NEWKEYS) {
|
|
user_error('Expected SSH_MSG_NEWKEYS');
|
|
return false;
|
|
}
|
|
|
|
switch ($encrypt) {
|
|
case '3des-cbc':
|
|
if (!class_exists('Crypt_TripleDES')) {
|
|
require_once('Crypt/TripleDES.php');
|
|
}
|
|
$this->encrypt = new Crypt_TripleDES();
|
|
// $this->encrypt_block_size = 64 / 8 == the default
|
|
break;
|
|
case '3des-ctr':
|
|
if (!class_exists('Crypt_TripleDES')) {
|
|
require_once('Crypt/TripleDES.php');
|
|
}
|
|
$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':
|
|
if (!class_exists('Crypt_Rijndael')) {
|
|
require_once('Crypt/Rijndael.php');
|
|
}
|
|
$this->encrypt = new Crypt_Rijndael();
|
|
$this->encrypt_block_size = 16; // eg. 128 / 8
|
|
break;
|
|
case 'aes256-ctr':
|
|
case 'aes192-ctr':
|
|
case 'aes128-ctr':
|
|
if (!class_exists('Crypt_Rijndael')) {
|
|
require_once('Crypt/Rijndael.php');
|
|
}
|
|
$this->encrypt = new Crypt_Rijndael(CRYPT_RIJNDAEL_MODE_CTR);
|
|
$this->encrypt_block_size = 16; // eg. 128 / 8
|
|
break;
|
|
case 'blowfish-cbc':
|
|
if (!class_exists('Crypt_Blowfish')) {
|
|
require_once('Crypt/Blowfish.php');
|
|
}
|
|
$this->encrypt = new Crypt_Blowfish();
|
|
$this->encrypt_block_size = 8;
|
|
break;
|
|
case 'blowfish-ctr':
|
|
if (!class_exists('Crypt_Blowfish')) {
|
|
require_once('Crypt/Blowfish.php');
|
|
}
|
|
$this->encrypt = new Crypt_Blowfish(CRYPT_BLOWFISH_MODE_CTR);
|
|
$this->encrypt_block_size = 8;
|
|
break;
|
|
case 'twofish128-cbc':
|
|
case 'twofish192-cbc':
|
|
case 'twofish256-cbc':
|
|
case 'twofish-cbc':
|
|
if (!class_exists('Crypt_Twofish')) {
|
|
require_once('Crypt/Twofish.php');
|
|
}
|
|
$this->encrypt = new Crypt_Twofish();
|
|
$this->encrypt_block_size = 16;
|
|
break;
|
|
case 'twofish128-ctr':
|
|
case 'twofish192-ctr':
|
|
case 'twofish256-ctr':
|
|
if (!class_exists('Crypt_Twofish')) {
|
|
require_once('Crypt/Twofish.php');
|
|
}
|
|
$this->encrypt = new Crypt_Twofish(CRYPT_TWOFISH_MODE_CTR);
|
|
$this->encrypt_block_size = 16;
|
|
break;
|
|
case 'arcfour':
|
|
case 'arcfour128':
|
|
case 'arcfour256':
|
|
if (!class_exists('Crypt_RC4')) {
|
|
require_once('Crypt/RC4.php');
|
|
}
|
|
$this->encrypt = new Crypt_RC4();
|
|
break;
|
|
case 'none';
|
|
//$this->encrypt = new Crypt_Null();
|
|
}
|
|
|
|
switch ($decrypt) {
|
|
case '3des-cbc':
|
|
if (!class_exists('Crypt_TripleDES')) {
|
|
require_once('Crypt/TripleDES.php');
|
|
}
|
|
$this->decrypt = new Crypt_TripleDES();
|
|
break;
|
|
case '3des-ctr':
|
|
if (!class_exists('Crypt_TripleDES')) {
|
|
require_once('Crypt/TripleDES.php');
|
|
}
|
|
$this->decrypt = new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
|
|
break;
|
|
case 'aes256-cbc':
|
|
case 'aes192-cbc':
|
|
case 'aes128-cbc':
|
|
if (!class_exists('Crypt_Rijndael')) {
|
|
require_once('Crypt/Rijndael.php');
|
|
}
|
|
$this->decrypt = new Crypt_Rijndael();
|
|
$this->decrypt_block_size = 16;
|
|
break;
|
|
case 'aes256-ctr':
|
|
case 'aes192-ctr':
|
|
case 'aes128-ctr':
|
|
if (!class_exists('Crypt_Rijndael')) {
|
|
require_once('Crypt/Rijndael.php');
|
|
}
|
|
$this->decrypt = new Crypt_Rijndael(CRYPT_RIJNDAEL_MODE_CTR);
|
|
$this->decrypt_block_size = 16;
|
|
break;
|
|
case 'blowfish-cbc':
|
|
if (!class_exists('Crypt_Blowfish')) {
|
|
require_once('Crypt/Blowfish.php');
|
|
}
|
|
$this->decrypt = new Crypt_Blowfish();
|
|
$this->decrypt_block_size = 8;
|
|
break;
|
|
case 'blowfish-ctr':
|
|
if (!class_exists('Crypt_Blowfish')) {
|
|
require_once('Crypt/Blowfish.php');
|
|
}
|
|
$this->decrypt = new Crypt_Blowfish(CRYPT_BLOWFISH_MODE_CTR);
|
|
$this->decrypt_block_size = 8;
|
|
break;
|
|
case 'twofish128-cbc':
|
|
case 'twofish192-cbc':
|
|
case 'twofish256-cbc':
|
|
case 'twofish-cbc':
|
|
if (!class_exists('Crypt_Twofish')) {
|
|
require_once('Crypt/Twofish.php');
|
|
}
|
|
$this->decrypt = new Crypt_Twofish();
|
|
$this->decrypt_block_size = 16;
|
|
break;
|
|
case 'twofish128-ctr':
|
|
case 'twofish192-ctr':
|
|
case 'twofish256-ctr':
|
|
if (!class_exists('Crypt_Twofish')) {
|
|
require_once('Crypt/Twofish.php');
|
|
}
|
|
$this->decrypt = new Crypt_Twofish(CRYPT_TWOFISH_MODE_CTR);
|
|
$this->decrypt_block_size = 16;
|
|
break;
|
|
case 'arcfour':
|
|
case 'arcfour128':
|
|
case 'arcfour256':
|
|
if (!class_exists('Crypt_RC4')) {
|
|
require_once('Crypt/RC4.php');
|
|
}
|
|
$this->decrypt = new Crypt_RC4();
|
|
break;
|
|
case 'none';
|
|
//$this->decrypt = new Crypt_Null();
|
|
}
|
|
|
|
$keyBytes = pack('Na*', strlen($keyBytes), $keyBytes);
|
|
|
|
if ($this->encrypt) {
|
|
$this->encrypt->enableContinuousBuffer();
|
|
$this->encrypt->disablePadding();
|
|
|
|
$iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'A' . $this->session_id);
|
|
while ($this->encrypt_block_size > strlen($iv)) {
|
|
$iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv);
|
|
}
|
|
$this->encrypt->setIV(substr($iv, 0, $this->encrypt_block_size));
|
|
|
|
$key = $kexHash->hash($keyBytes . $this->exchange_hash . 'C' . $this->session_id);
|
|
while ($encryptKeyLength > strlen($key)) {
|
|
$key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
|
|
}
|
|
$this->encrypt->setKey(substr($key, 0, $encryptKeyLength));
|
|
}
|
|
|
|
if ($this->decrypt) {
|
|
$this->decrypt->enableContinuousBuffer();
|
|
$this->decrypt->disablePadding();
|
|
|
|
$iv = $kexHash->hash($keyBytes . $this->exchange_hash . 'B' . $this->session_id);
|
|
while ($this->decrypt_block_size > strlen($iv)) {
|
|
$iv.= $kexHash->hash($keyBytes . $this->exchange_hash . $iv);
|
|
}
|
|
$this->decrypt->setIV(substr($iv, 0, $this->decrypt_block_size));
|
|
|
|
$key = $kexHash->hash($keyBytes . $this->exchange_hash . 'D' . $this->session_id);
|
|
while ($decryptKeyLength > strlen($key)) {
|
|
$key.= $kexHash->hash($keyBytes . $this->exchange_hash . $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');
|
|
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');
|
|
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 = $kexHash->hash($keyBytes . $this->exchange_hash . 'E' . $this->session_id);
|
|
while ($createKeyLength > strlen($key)) {
|
|
$key.= $kexHash->hash($keyBytes . $this->exchange_hash . $key);
|
|
}
|
|
$this->hmac_create->setKey(substr($key, 0, $createKeyLength));
|
|
|
|
$key = $kexHash->hash($keyBytes . $this->exchange_hash . 'F' . $this->session_id);
|
|
while ($checkKeyLength > strlen($key)) {
|
|
$key.= $kexHash->hash($keyBytes . $this->exchange_hash . $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');
|
|
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');
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
$this->compress = $compression_algorithms[$i] == 'zlib';
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Login
|
|
*
|
|
* The $password parameter can be a plaintext password, a Crypt_RSA object or an array
|
|
*
|
|
* @param String $username
|
|
* @param Mixed $password
|
|
* @param Mixed $...
|
|
* @return Boolean
|
|
* @see _login_helper
|
|
* @access public
|
|
*/
|
|
function login($username)
|
|
{
|
|
$args = array_slice(func_get_args(), 1);
|
|
if (empty($args)) {
|
|
return $this->_login_helper($username);
|
|
}
|
|
|
|
foreach ($args as $arg) {
|
|
if ($this->_login_helper($username, $arg)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Login Helper
|
|
*
|
|
* @param String $username
|
|
* @param optional String $password
|
|
* @return Boolean
|
|
* @access private
|
|
* @internal It might be worthwhile, at some point, to protect against {@link http://tools.ietf.org/html/rfc4251#section-9.3.9 traffic analysis}
|
|
* by sending dummy SSH_MSG_IGNORE messages.
|
|
*/
|
|
function _login_helper($username, $password = null)
|
|
{
|
|
if (!($this->bitmap & NET_SSH2_MASK_CONSTRUCTOR)) {
|
|
return false;
|
|
}
|
|
|
|
if (!($this->bitmap & NET_SSH2_MASK_LOGIN_REQ)) {
|
|
$packet = pack('CNa*',
|
|
NET_SSH2_MSG_SERVICE_REQUEST, strlen('ssh-userauth'), 'ssh-userauth'
|
|
);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server');
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
if ($type != NET_SSH2_MSG_SERVICE_ACCEPT) {
|
|
user_error('Expected SSH_MSG_SERVICE_ACCEPT');
|
|
return false;
|
|
}
|
|
$this->bitmap |= NET_SSH2_MASK_LOGIN_REQ;
|
|
}
|
|
|
|
if (strlen($this->last_interactive_response)) {
|
|
return !is_string($password) && !is_array($password) ? false : $this->_keyboard_interactive_process($password);
|
|
}
|
|
|
|
// 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, $password);
|
|
}
|
|
|
|
if (is_array($password)) {
|
|
if ($this->_keyboard_interactive_login($username, $password)) {
|
|
$this->bitmap |= NET_SSH2_MASK_LOGIN;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
if (!isset($password)) {
|
|
$packet = pack('CNa*Na*Na*',
|
|
NET_SSH2_MSG_USERAUTH_REQUEST, strlen($username), $username, strlen('ssh-connection'), 'ssh-connection',
|
|
strlen('none'), 'none'
|
|
);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server');
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_USERAUTH_SUCCESS:
|
|
$this->bitmap |= NET_SSH2_MASK_LOGIN;
|
|
return true;
|
|
//case NET_SSH2_MSG_USERAUTH_FAILURE:
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
$packet = pack('CNa*Na*Na*CNa*',
|
|
NET_SSH2_MSG_USERAUTH_REQUEST, strlen($username), $username, strlen('ssh-connection'), 'ssh-connection',
|
|
strlen('password'), 'password', 0, strlen($password), $password
|
|
);
|
|
|
|
if (!$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');
|
|
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:
|
|
// can we use keyboard-interactive authentication? if not then either the login is bad or the server employees
|
|
// multi-factor authentication
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
$auth_methods = explode(',', $this->_string_shift($response, $length));
|
|
extract(unpack('Cpartial_success', $this->_string_shift($response, 1)));
|
|
$partial_success = $partial_success != 0;
|
|
|
|
if (!$partial_success && in_array('keyboard-interactive', $auth_methods)) {
|
|
if ($this->_keyboard_interactive_login($username, $password)) {
|
|
$this->bitmap |= NET_SSH2_MASK_LOGIN;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
return false;
|
|
case NET_SSH2_MSG_USERAUTH_SUCCESS:
|
|
$this->bitmap |= NET_SSH2_MASK_LOGIN;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Login via keyboard-interactive authentication
|
|
*
|
|
* See {@link http://tools.ietf.org/html/rfc4256 RFC4256} for details. This is not a full-featured keyboard-interactive authenticator.
|
|
*
|
|
* @param String $username
|
|
* @param String $password
|
|
* @return Boolean
|
|
* @access private
|
|
*/
|
|
function _keyboard_interactive_login($username, $password)
|
|
{
|
|
$packet = pack('CNa*Na*Na*Na*Na*',
|
|
NET_SSH2_MSG_USERAUTH_REQUEST, strlen($username), $username, strlen('ssh-connection'), 'ssh-connection',
|
|
strlen('keyboard-interactive'), 'keyboard-interactive', 0, '', 0, ''
|
|
);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
return $this->_keyboard_interactive_process($password);
|
|
}
|
|
|
|
/**
|
|
* Handle the keyboard-interactive requests / responses.
|
|
*
|
|
* @param String $responses...
|
|
* @return Boolean
|
|
* @access private
|
|
*/
|
|
function _keyboard_interactive_process()
|
|
{
|
|
$responses = func_get_args();
|
|
|
|
if (strlen($this->last_interactive_response)) {
|
|
$response = $this->last_interactive_response;
|
|
} else {
|
|
$orig = $response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server');
|
|
return false;
|
|
}
|
|
}
|
|
|
|
extract(unpack('Ctype', $this->_string_shift($response, 1)));
|
|
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_USERAUTH_INFO_REQUEST:
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
$this->_string_shift($response, $length); // name; may be empty
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
$this->_string_shift($response, $length); // instruction; may be empty
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
$this->_string_shift($response, $length); // language tag; may be empty
|
|
extract(unpack('Nnum_prompts', $this->_string_shift($response, 4)));
|
|
|
|
for ($i = 0; $i < count($responses); $i++) {
|
|
if (is_array($responses[$i])) {
|
|
foreach ($responses[$i] as $key => $value) {
|
|
$this->keyboard_requests_responses[$key] = $value;
|
|
}
|
|
unset($responses[$i]);
|
|
}
|
|
}
|
|
$responses = array_values($responses);
|
|
|
|
if (isset($this->keyboard_requests_responses)) {
|
|
for ($i = 0; $i < $num_prompts; $i++) {
|
|
extract(unpack('Nlength', $this->_string_shift($response, 4)));
|
|
// prompt - ie. "Password: "; must not be empty
|
|
$prompt = $this->_string_shift($response, $length);
|
|
//$echo = $this->_string_shift($response) != chr(0);
|
|
foreach ($this->keyboard_requests_responses as $key => $value) {
|
|
if (substr($prompt, 0, strlen($key)) == $key) {
|
|
$responses[] = $value;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// see http://tools.ietf.org/html/rfc4256#section-3.2
|
|
if (strlen($this->last_interactive_response)) {
|
|
$this->last_interactive_response = '';
|
|
} else if (defined('NET_SSH2_LOGGING')) {
|
|
$this->message_number_log[count($this->message_number_log) - 1] = str_replace(
|
|
'UNKNOWN',
|
|
'NET_SSH2_MSG_USERAUTH_INFO_REQUEST',
|
|
$this->message_number_log[count($this->message_number_log) - 1]
|
|
);
|
|
}
|
|
|
|
if (!count($responses) && $num_prompts) {
|
|
$this->last_interactive_response = $orig;
|
|
$this->bitmap |= NET_SSH_MASK_LOGIN_INTERACTIVE;
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
After obtaining the requested information from the user, the client
|
|
MUST respond with an SSH_MSG_USERAUTH_INFO_RESPONSE message.
|
|
*/
|
|
// see http://tools.ietf.org/html/rfc4256#section-3.4
|
|
$packet = $logged = pack('CN', NET_SSH2_MSG_USERAUTH_INFO_RESPONSE, count($responses));
|
|
for ($i = 0; $i < count($responses); $i++) {
|
|
$packet.= pack('Na*', strlen($responses[$i]), $responses[$i]);
|
|
$logged.= pack('Na*', strlen('dummy-answer'), 'dummy-answer');
|
|
}
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
if (defined('NET_SSH2_LOGGING')) {
|
|
$this->message_number_log[count($this->message_number_log) - 1] = str_replace(
|
|
'UNKNOWN',
|
|
'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE',
|
|
$this->message_number_log[count($this->message_number_log) - 1]
|
|
);
|
|
$this->message_log[count($this->message_log) - 1] = $logged;
|
|
}
|
|
|
|
/*
|
|
After receiving the response, the server MUST send either an
|
|
SSH_MSG_USERAUTH_SUCCESS, SSH_MSG_USERAUTH_FAILURE, or another
|
|
SSH_MSG_USERAUTH_INFO_REQUEST message.
|
|
*/
|
|
// maybe phpseclib should force close the connection after x request / responses? unless something like that is done
|
|
// there could be an infinite loop of request / responses.
|
|
return $this->_keyboard_interactive_process();
|
|
case NET_SSH2_MSG_USERAUTH_SUCCESS:
|
|
return true;
|
|
case NET_SSH2_MSG_USERAUTH_FAILURE:
|
|
return false;
|
|
}
|
|
|
|
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');
|
|
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 false;
|
|
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] = str_replace(
|
|
'UNKNOWN',
|
|
'NET_SSH2_MSG_USERAUTH_PK_OK',
|
|
$this->message_number_log[count($this->message_number_log) - 1]
|
|
);
|
|
}
|
|
}
|
|
|
|
$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');
|
|
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 employs multi-factor authentication
|
|
return false;
|
|
case NET_SSH2_MSG_USERAUTH_SUCCESS:
|
|
$this->bitmap |= NET_SSH2_MASK_LOGIN;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Set Timeout
|
|
*
|
|
* $ssh->exec('ping 127.0.0.1'); on a Linux host will never return and will run indefinitely. setTimeout() makes it so it'll timeout.
|
|
* Setting $timeout to false or 0 will mean there is no timeout.
|
|
*
|
|
* @param Mixed $timeout
|
|
* @access public
|
|
*/
|
|
function setTimeout($timeout)
|
|
{
|
|
$this->timeout = $this->curTimeout = $timeout;
|
|
}
|
|
|
|
/**
|
|
* Get the output from stdError
|
|
*
|
|
* @access public
|
|
*/
|
|
function getStdError()
|
|
{
|
|
return $this->stdErrorLog;
|
|
}
|
|
|
|
/**
|
|
* Execute Command
|
|
*
|
|
* If $block is set to false then Net_SSH2::_get_channel_packet(NET_SSH2_CHANNEL_EXEC) will need to be called manually.
|
|
* In all likelihood, this is not a feature you want to be taking advantage of.
|
|
*
|
|
* @param String $command
|
|
* @param optional Boolean $block
|
|
* @return String
|
|
* @access public
|
|
*/
|
|
function exec($command, $callback = NULL)
|
|
{
|
|
$this->curTimeout = $this->timeout;
|
|
$this->is_timeout = false;
|
|
$this->stdErrorLog = '';
|
|
|
|
if (!($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 2GB, the max size. technically, it should probably be decremented, but,
|
|
// honestly, if you're transfering more than 2GB, you probably shouldn't be using phpseclib, anyway.
|
|
// see http://tools.ietf.org/html/rfc4254#section-5.2 for more info
|
|
$this->window_size_server_to_client[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_server_to_client[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;
|
|
}
|
|
|
|
if ($this->request_pty === true) {
|
|
$terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
|
|
$packet = pack('CNNa*CNa*N5a*',
|
|
NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SSH2_CHANNEL_EXEC], strlen('pty-req'), 'pty-req', 1, strlen('vt100'), 'vt100',
|
|
80, 24, 0, 0, strlen($terminal_modes), $terminal_modes);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server');
|
|
return false;
|
|
}
|
|
|
|
list(, $type) = unpack('C', $this->_string_shift($response, 1));
|
|
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_CHANNEL_SUCCESS:
|
|
break;
|
|
case NET_SSH2_MSG_CHANNEL_FAILURE:
|
|
default:
|
|
user_error('Unable to request pseudo-terminal');
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
}
|
|
$this->in_request_pty_exec = true;
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
|
|
$this->channel_status[NET_SSH2_CHANNEL_EXEC] = NET_SSH2_MSG_CHANNEL_DATA;
|
|
|
|
if ($callback === false || $this->in_request_pty_exec) {
|
|
return true;
|
|
}
|
|
|
|
$output = '';
|
|
while (true) {
|
|
$temp = $this->_get_channel_packet(NET_SSH2_CHANNEL_EXEC);
|
|
switch (true) {
|
|
case $temp === true:
|
|
return is_callable($callback) ? true : $output;
|
|
case $temp === false:
|
|
return false;
|
|
default:
|
|
if (is_callable($callback)) {
|
|
$callback($temp);
|
|
} else {
|
|
$output.= $temp;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Creates an interactive shell
|
|
*
|
|
* @see Net_SSH2::read()
|
|
* @see Net_SSH2::write()
|
|
* @return Boolean
|
|
* @access private
|
|
*/
|
|
function _initShell()
|
|
{
|
|
if ($this->in_request_pty_exec === true) {
|
|
return true;
|
|
}
|
|
|
|
$this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL] = 0x7FFFFFFF;
|
|
$packet_size = 0x4000;
|
|
|
|
$packet = pack('CNa*N3',
|
|
NET_SSH2_MSG_CHANNEL_OPEN, strlen('session'), 'session', NET_SSH2_CHANNEL_SHELL, $this->window_size_server_to_client[NET_SSH2_CHANNEL_SHELL], $packet_size);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_OPEN;
|
|
|
|
$response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL);
|
|
if ($response === false) {
|
|
return false;
|
|
}
|
|
|
|
$terminal_modes = pack('C', NET_SSH2_TTY_OP_END);
|
|
$packet = pack('CNNa*CNa*N5a*',
|
|
NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SSH2_CHANNEL_SHELL], strlen('pty-req'), 'pty-req', 1, strlen('vt100'), 'vt100',
|
|
80, 24, 0, 0, strlen($terminal_modes), $terminal_modes);
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server');
|
|
return false;
|
|
}
|
|
|
|
list(, $type) = unpack('C', $this->_string_shift($response, 1));
|
|
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_CHANNEL_SUCCESS:
|
|
break;
|
|
case NET_SSH2_MSG_CHANNEL_FAILURE:
|
|
default:
|
|
user_error('Unable to request pseudo-terminal');
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
}
|
|
|
|
$packet = pack('CNNa*C',
|
|
NET_SSH2_MSG_CHANNEL_REQUEST, $this->server_channels[NET_SSH2_CHANNEL_SHELL], strlen('shell'), 'shell', 1);
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
$this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_REQUEST;
|
|
|
|
$response = $this->_get_channel_packet(NET_SSH2_CHANNEL_SHELL);
|
|
if ($response === false) {
|
|
return false;
|
|
}
|
|
|
|
$this->channel_status[NET_SSH2_CHANNEL_SHELL] = NET_SSH2_MSG_CHANNEL_DATA;
|
|
|
|
$this->bitmap |= NET_SSH2_MASK_SHELL;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns the output of an interactive shell
|
|
*
|
|
* Returns when there's a match for $expect, which can take the form of a string literal or,
|
|
* if $mode == NET_SSH2_READ_REGEX, a regular expression.
|
|
*
|
|
* @see Net_SSH2::read()
|
|
* @param String $expect
|
|
* @param Integer $mode
|
|
* @return String
|
|
* @access public
|
|
*/
|
|
function read($expect = '', $mode = NET_SSH2_READ_SIMPLE)
|
|
{
|
|
$this->curTimeout = $this->timeout;
|
|
$this->is_timeout = false;
|
|
|
|
if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
|
|
user_error('Operation disallowed prior to login()');
|
|
return false;
|
|
}
|
|
|
|
if (!($this->bitmap & NET_SSH2_MASK_SHELL) && !$this->_initShell()) {
|
|
user_error('Unable to initiate an interactive shell session');
|
|
return false;
|
|
}
|
|
|
|
$channel = $this->in_request_pty_exec ? NET_SSH2_CHANNEL_EXEC : NET_SSH2_CHANNEL_SHELL;
|
|
|
|
$match = $expect;
|
|
while (true) {
|
|
if ($mode == NET_SSH2_READ_REGEX) {
|
|
preg_match($expect, $this->interactiveBuffer, $matches);
|
|
$match = isset($matches[0]) ? $matches[0] : '';
|
|
}
|
|
$pos = strlen($match) ? strpos($this->interactiveBuffer, $match) : false;
|
|
if ($pos !== false) {
|
|
return $this->_string_shift($this->interactiveBuffer, $pos + strlen($match));
|
|
}
|
|
$response = $this->_get_channel_packet($channel);
|
|
if (is_bool($response)) {
|
|
$this->in_request_pty_exec = false;
|
|
return $response ? $this->_string_shift($this->interactiveBuffer, strlen($this->interactiveBuffer)) : false;
|
|
}
|
|
|
|
$this->interactiveBuffer.= $response;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Inputs a command into an interactive shell.
|
|
*
|
|
* @see Net_SSH1::interactiveWrite()
|
|
* @param String $cmd
|
|
* @return Boolean
|
|
* @access public
|
|
*/
|
|
function write($cmd)
|
|
{
|
|
if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
|
|
user_error('Operation disallowed prior to login()');
|
|
return false;
|
|
}
|
|
|
|
if (!($this->bitmap & NET_SSH2_MASK_SHELL) && !$this->_initShell()) {
|
|
user_error('Unable to initiate an interactive shell session');
|
|
return false;
|
|
}
|
|
|
|
$channel = $this->in_request_pty_exec ? NET_SSH2_CHANNEL_EXEC : NET_SSH2_CHANNEL_SHELL;
|
|
return $this->_send_channel_packet($channel, $cmd);
|
|
}
|
|
|
|
/**
|
|
* Closes a channel
|
|
*
|
|
* If read() timed out you might want to just close the channel and have it auto-restart on the next read() call
|
|
*
|
|
* @access public
|
|
*/
|
|
function reset()
|
|
{
|
|
$channel = $this->in_request_pty_exec ? NET_SSH2_CHANNEL_EXEC : NET_SSH2_CHANNEL_SHELL;
|
|
$this->_close_channel($channel);
|
|
}
|
|
|
|
/**
|
|
* Is timeout?
|
|
*
|
|
* Did exec() or read() return because they timed out or because they encountered the end?
|
|
*
|
|
* @access public
|
|
*/
|
|
function isTimeout()
|
|
{
|
|
return $this->is_timeout;
|
|
}
|
|
|
|
/**
|
|
* Disconnect
|
|
*
|
|
* @access public
|
|
*/
|
|
function disconnect()
|
|
{
|
|
$this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
if (isset($this->realtime_log_file) && is_resource($this->realtime_log_file)) {
|
|
fclose($this->realtime_log_file);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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();
|
|
}
|
|
|
|
/**
|
|
* Is the connection still active?
|
|
*
|
|
* @access public
|
|
*/
|
|
function isConnected()
|
|
{
|
|
return $this->bitmap & NET_SSH2_MASK_LOGIN;
|
|
}
|
|
|
|
/**
|
|
* Gets Binary Packets
|
|
*
|
|
* See '6. Binary Packet Protocol' of rfc4253 for more info.
|
|
*
|
|
* @see Net_SSH2::_send_binary_packet()
|
|
* @return String
|
|
* @access private
|
|
*/
|
|
function _get_binary_packet()
|
|
{
|
|
if (!is_resource($this->fsock) || feof($this->fsock)) {
|
|
user_error('Connection closed prematurely');
|
|
$this->bitmask = 0;
|
|
return false;
|
|
}
|
|
|
|
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
|
|
$raw = fread($this->fsock, $this->decrypt_block_size);
|
|
|
|
if (!strlen($raw)) {
|
|
return '';
|
|
}
|
|
|
|
if ($this->decrypt !== false) {
|
|
$raw = $this->decrypt->decrypt($raw);
|
|
}
|
|
if ($raw === false) {
|
|
user_error('Unable to decrypt content');
|
|
return false;
|
|
}
|
|
|
|
extract(unpack('Npacket_length/Cpadding_length', $this->_string_shift($raw, 5)));
|
|
|
|
$remaining_length = $packet_length + 4 - $this->decrypt_block_size;
|
|
|
|
// quoting <http://tools.ietf.org/html/rfc4253#section-6.1>,
|
|
// "implementations SHOULD check that the packet length is reasonable"
|
|
// PuTTY uses 0x9000 as the actual max packet size and so to shall we
|
|
if ($remaining_length < -$this->decrypt_block_size || $remaining_length > 0x9000 || $remaining_length % $this->decrypt_block_size != 0) {
|
|
user_error('Invalid size');
|
|
return false;
|
|
}
|
|
|
|
$buffer = '';
|
|
while ($remaining_length > 0) {
|
|
$temp = fread($this->fsock, $remaining_length);
|
|
$buffer.= $temp;
|
|
$remaining_length-= strlen($temp);
|
|
}
|
|
$stop = strtok(microtime(), ' ') + strtok('');
|
|
if (strlen($buffer)) {
|
|
$raw.= $this->decrypt !== false ? $this->decrypt->decrypt($buffer) : $buffer;
|
|
}
|
|
|
|
$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 . $padding))) {
|
|
user_error('Invalid HMAC');
|
|
return false;
|
|
}
|
|
}
|
|
|
|
//if ($this->decompress) {
|
|
// $payload = gzinflate(substr($payload, 2));
|
|
//}
|
|
|
|
$this->get_seq_no++;
|
|
|
|
if (defined('NET_SSH2_LOGGING')) {
|
|
$current = strtok(microtime(), ' ') + strtok('');
|
|
$message_number = isset($this->message_numbers[ord($payload[0])]) ? $this->message_numbers[ord($payload[0])] : 'UNKNOWN (' . ord($payload[0]) . ')';
|
|
$message_number = '<- ' . $message_number .
|
|
' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';
|
|
$this->_append_log($message_number, $payload);
|
|
$this->last_packet = $current;
|
|
}
|
|
|
|
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)));
|
|
$this->banner_message = utf8_decode($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('Nlength', $this->_string_shift($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:
|
|
$this->_string_shift($payload, 1);
|
|
extract(unpack('Nchannel', $this->_string_shift($payload, 4)));
|
|
extract(unpack('Nwindow_size', $this->_string_shift($payload, 4)));
|
|
$this->window_size_client_to_server[$channel] = $window_size;
|
|
|
|
$payload = ($this->bitmap & NET_SSH2_MASK_WINDOW_ADJUST) ? true : $this->_get_binary_packet();
|
|
|
|
}
|
|
}
|
|
|
|
return $payload;
|
|
}
|
|
|
|
/**
|
|
* Enable Quiet Mode
|
|
*
|
|
* Suppress stderr from output
|
|
*
|
|
* @access public
|
|
*/
|
|
function enableQuietMode()
|
|
{
|
|
$this->quiet_mode = true;
|
|
}
|
|
|
|
/**
|
|
* Disable Quiet Mode
|
|
*
|
|
* Show stderr in output
|
|
*
|
|
* @access public
|
|
*/
|
|
function disableQuietMode()
|
|
{
|
|
$this->quiet_mode = false;
|
|
}
|
|
|
|
/**
|
|
* Enable request-pty when using exec()
|
|
*
|
|
* @access public
|
|
*/
|
|
function enablePTY()
|
|
{
|
|
$this->request_pty = true;
|
|
}
|
|
|
|
/**
|
|
* Disable request-pty when using exec()
|
|
*
|
|
* @access public
|
|
*/
|
|
function disablePTY()
|
|
{
|
|
$this->request_pty = false;
|
|
}
|
|
|
|
/**
|
|
* 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, $skip_extended = false)
|
|
{
|
|
if (!empty($this->channel_buffers[$client_channel])) {
|
|
return array_shift($this->channel_buffers[$client_channel]);
|
|
}
|
|
|
|
while (true) {
|
|
if ($this->curTimeout) {
|
|
if ($this->curTimeout < 0) {
|
|
$this->is_timeout = true;
|
|
return true;
|
|
}
|
|
|
|
$read = array($this->fsock);
|
|
$write = $except = NULL;
|
|
|
|
$start = strtok(microtime(), ' ') + strtok(''); // http://php.net/microtime#61838
|
|
$sec = floor($this->curTimeout);
|
|
$usec = 1000000 * ($this->curTimeout - $sec);
|
|
// on windows this returns a "Warning: Invalid CRT parameters detected" error
|
|
if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
|
|
$this->is_timeout = true;
|
|
return true;
|
|
}
|
|
$elapsed = strtok(microtime(), ' ') + strtok('') - $start;
|
|
$this->curTimeout-= $elapsed;
|
|
}
|
|
|
|
$response = $this->_get_binary_packet();
|
|
if ($response === false) {
|
|
user_error('Connection closed by server');
|
|
return false;
|
|
}
|
|
if ($client_channel == -1 && $response === true) {
|
|
return true;
|
|
}
|
|
if (!strlen($response)) {
|
|
return '';
|
|
}
|
|
|
|
extract(unpack('Ctype/Nchannel', $this->_string_shift($response, 5)));
|
|
|
|
// resize the window, if appropriate
|
|
$this->window_size_server_to_client[$channel]-= strlen($response);
|
|
if ($this->window_size_server_to_client[$channel] < 0) {
|
|
$packet = pack('CNN', NET_SSH2_MSG_CHANNEL_WINDOW_ADJUST, $this->server_channels[$channel], $this->window_size);
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
$this->window_size_server_to_client[$channel]+= $this->window_size;
|
|
}
|
|
|
|
switch ($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)));
|
|
$this->server_channels[$channel] = $server_channel;
|
|
extract(unpack('Nwindow_size', $this->_string_shift($response, 4)));
|
|
$this->window_size_client_to_server[$channel] = $window_size;
|
|
$temp = unpack('Npacket_size_client_to_server', $this->_string_shift($response, 4));
|
|
$this->packet_size_client_to_server[$channel] = $temp['packet_size_client_to_server'];
|
|
return $client_channel == $channel ? true : $this->_get_channel_packet($client_channel, $skip_extended);
|
|
//case NET_SSH2_MSG_CHANNEL_OPEN_FAILURE:
|
|
default:
|
|
user_error('Unable to open channel');
|
|
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:
|
|
return false;
|
|
default:
|
|
user_error('Unable to fulfill channel request');
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_BY_APPLICATION);
|
|
}
|
|
case NET_SSH2_MSG_CHANNEL_CLOSE:
|
|
return $type == NET_SSH2_MSG_CHANNEL_CLOSE ? true : $this->_get_channel_packet($client_channel, $skip_extended);
|
|
}
|
|
|
|
// ie. $this->channel_status[$channel] == NET_SSH2_MSG_CHANNEL_DATA
|
|
|
|
switch ($type) {
|
|
case NET_SSH2_MSG_CHANNEL_DATA:
|
|
/*
|
|
if ($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.
|
|
$this->_send_channel_packet($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[$channel])) {
|
|
$this->channel_buffers[$channel] = array();
|
|
}
|
|
$this->channel_buffers[$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);
|
|
$this->stdErrorLog .= $data;
|
|
if ($skip_extended || $this->quiet_mode) {
|
|
break;
|
|
}
|
|
if ($client_channel == $channel) {
|
|
return $data;
|
|
}
|
|
if (!isset($this->channel_buffers[$channel])) {
|
|
$this->channel_buffers[$channel] = array();
|
|
}
|
|
$this->channel_buffers[$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);
|
|
}
|
|
|
|
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel]));
|
|
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));
|
|
|
|
$this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_EOF;
|
|
|
|
break;
|
|
case 'exit-status':
|
|
extract(unpack('Cfalse/Nexit_status', $this->_string_shift($response, 5)));
|
|
$this->exit_status = $exit_status;
|
|
// "The channel needs to be closed with SSH_MSG_CHANNEL_CLOSE after this message."
|
|
// -- http://tools.ietf.org/html/rfc4254#section-6.10
|
|
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel]));
|
|
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));
|
|
|
|
$this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_EOF;
|
|
|
|
break;
|
|
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:
|
|
$this->curTimeout = 0;
|
|
|
|
if ($this->bitmap & NET_SSH2_MASK_SHELL) {
|
|
$this->bitmap&= ~NET_SSH2_MASK_SHELL;
|
|
}
|
|
if ($this->channel_status[$channel] != NET_SSH2_MSG_CHANNEL_EOF) {
|
|
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$channel]));
|
|
}
|
|
|
|
$this->channel_status[$channel] = NET_SSH2_MSG_CHANNEL_CLOSE;
|
|
return true;
|
|
case NET_SSH2_MSG_CHANNEL_EOF:
|
|
break;
|
|
default:
|
|
user_error('Error reading channel data');
|
|
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 (!is_resource($this->fsock) || feof($this->fsock)) {
|
|
user_error('Connection closed prematurely');
|
|
$this->bitmask = 0;
|
|
return false;
|
|
}
|
|
|
|
//if ($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;
|
|
$padding = crypt_random_string($padding_length);
|
|
|
|
// 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')) {
|
|
$current = strtok(microtime(), ' ') + strtok('');
|
|
$message_number = isset($this->message_numbers[ord($data[0])]) ? $this->message_numbers[ord($data[0])] : 'UNKNOWN (' . ord($data[0]) . ')';
|
|
$message_number = '-> ' . $message_number .
|
|
' (since last: ' . round($current - $this->last_packet, 4) . ', network: ' . round($stop - $start, 4) . 's)';
|
|
$this->_append_log($message_number, $data);
|
|
$this->last_packet = $current;
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Logs data packets
|
|
*
|
|
* Makes sure that only the last 1MB worth of packets will be logged
|
|
*
|
|
* @param String $data
|
|
* @access private
|
|
*/
|
|
function _append_log($message_number, $message)
|
|
{
|
|
switch (NET_SSH2_LOGGING) {
|
|
// useful for benchmarks
|
|
case NET_SSH2_LOG_SIMPLE:
|
|
$this->message_number_log[] = $message_number;
|
|
break;
|
|
// the most useful log for SSH2
|
|
case NET_SSH2_LOG_COMPLEX:
|
|
$this->message_number_log[] = $message_number;
|
|
$this->_string_shift($message);
|
|
$this->log_size+= strlen($message);
|
|
$this->message_log[] = $message;
|
|
while ($this->log_size > NET_SSH2_LOG_MAX_SIZE) {
|
|
$this->log_size-= strlen(array_shift($this->message_log));
|
|
array_shift($this->message_number_log);
|
|
}
|
|
break;
|
|
// dump the output out realtime; packets may be interspersed with non packets,
|
|
// passwords won't be filtered out and select other packets may not be correctly
|
|
// identified
|
|
case NET_SSH2_LOG_REALTIME:
|
|
echo "<pre>\r\n" . $this->_format_log(array($message), array($message_number)) . "\r\n</pre>\r\n";
|
|
@flush();
|
|
@ob_flush();
|
|
break;
|
|
// basically the same thing as NET_SSH2_LOG_REALTIME with the caveat that NET_SSH2_LOG_REALTIME_FILE
|
|
// needs to be defined and that the resultant log file will be capped out at NET_SSH2_LOG_MAX_SIZE.
|
|
// the earliest part of the log file is denoted by the first <<< START >>> and is not going to necessarily
|
|
// at the beginning of the file
|
|
case NET_SSH2_LOG_REALTIME_FILE:
|
|
if (!isset($this->realtime_log_file)) {
|
|
// PHP doesn't seem to like using constants in fopen()
|
|
$filename = NET_SSH2_LOG_REALTIME_FILENAME;
|
|
$fp = fopen($filename, 'w');
|
|
$this->realtime_log_file = $fp;
|
|
}
|
|
if (!is_resource($this->realtime_log_file)) {
|
|
break;
|
|
}
|
|
$entry = $this->_format_log(array($message), array($message_number));
|
|
if ($this->realtime_log_wrap) {
|
|
$temp = "<<< START >>>\r\n";
|
|
$entry.= $temp;
|
|
fseek($this->realtime_log_file, ftell($this->realtime_log_file) - strlen($temp));
|
|
}
|
|
$this->realtime_log_size+= strlen($entry);
|
|
if ($this->realtime_log_size > NET_SSH2_LOG_MAX_SIZE) {
|
|
fseek($this->realtime_log_file, 0);
|
|
$this->realtime_log_size = strlen($entry);
|
|
$this->realtime_log_wrap = true;
|
|
}
|
|
fputs($this->realtime_log_file, $entry);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
$max_size = min(
|
|
$this->packet_size_client_to_server[$client_channel],
|
|
$this->window_size_client_to_server[$client_channel]
|
|
);
|
|
while (strlen($data) > $max_size) {
|
|
$packet = pack('CN2a*',
|
|
NET_SSH2_MSG_CHANNEL_DATA,
|
|
$this->server_channels[$client_channel],
|
|
$max_size,
|
|
$this->_string_shift($data, $max_size)
|
|
);
|
|
|
|
$this->window_size_client_to_server[$client_channel]-= $max_size;
|
|
|
|
if (!$this->_send_binary_packet($packet)) {
|
|
return false;
|
|
}
|
|
|
|
if ($max_size == $this->window_size_client_to_server[$client_channel]) {
|
|
$this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
|
|
// using an invalid channel will let the buffers be built up for the valid channels
|
|
$this->_get_channel_packet(-1);
|
|
$this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
|
|
$max_size = min(
|
|
$this->packet_size_client_to_server[$client_channel],
|
|
$this->window_size_client_to_server[$client_channel]
|
|
);
|
|
}
|
|
}
|
|
|
|
if (strlen($data) >= $this->window_size_client_to_server[$client_channel]) {
|
|
$this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
|
|
$this->_get_channel_packet(-1);
|
|
$this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
|
|
}
|
|
|
|
$this->window_size_client_to_server[$client_channel]-= strlen($data);
|
|
|
|
return $this->_send_binary_packet(pack('CN2a*',
|
|
NET_SSH2_MSG_CHANNEL_DATA,
|
|
$this->server_channels[$client_channel],
|
|
strlen($data),
|
|
$data));
|
|
}
|
|
|
|
/**
|
|
* Closes and flushes a channel
|
|
*
|
|
* Net_SSH2 doesn't properly close most channels. For exec() channels are normally closed by the server
|
|
* and for SFTP channels are presumably closed when the client disconnects. This functions is intended
|
|
* for SCP more than anything.
|
|
*
|
|
* @param Integer $client_channel
|
|
* @return Boolean
|
|
* @access private
|
|
*/
|
|
function _close_channel($client_channel)
|
|
{
|
|
// see http://tools.ietf.org/html/rfc4254#section-5.3
|
|
|
|
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_EOF, $this->server_channels[$client_channel]));
|
|
|
|
$this->_send_binary_packet(pack('CN', NET_SSH2_MSG_CHANNEL_CLOSE, $this->server_channels[$client_channel]));
|
|
|
|
$this->channel_status[$client_channel] = NET_SSH2_MSG_CHANNEL_CLOSE;
|
|
|
|
$this->curTimeout = 0;
|
|
|
|
while (!is_bool($this->_get_channel_packet($client_channel)));
|
|
|
|
if ($this->bitmap & NET_SSH2_MASK_SHELL) {
|
|
$this->bitmap&= ~NET_SSH2_MASK_SHELL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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];
|
|
$j = 0;
|
|
do {
|
|
if (strlen($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";
|
|
$j++;
|
|
} while (strlen($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 banner message.
|
|
*
|
|
* Quoting from the RFC, "in some jurisdictions, sending a warning message before
|
|
* authentication may be relevant for getting legal protection."
|
|
*
|
|
* @return String
|
|
* @access public
|
|
*/
|
|
function getBannerMessage()
|
|
{
|
|
return $this->banner_message;
|
|
}
|
|
|
|
/**
|
|
* 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, $length);
|
|
|
|
if ($this->signature_validated) {
|
|
return $this->bitmap ?
|
|
$this->signature_format . ' ' . base64_encode($this->server_public_host_key) :
|
|
false;
|
|
}
|
|
|
|
$this->signature_validated = true;
|
|
|
|
switch ($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');
|
|
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');
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_KEY_EXCHANGE_FAILED);
|
|
}
|
|
|
|
$w = $s->modInverse($q);
|
|
|
|
$u1 = $w->multiply(new Math_BigInteger(sha1($this->exchange_hash), 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');
|
|
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->exchange_hash, $signature)) {
|
|
user_error('Bad server signature');
|
|
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');
|
|
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->exchange_hash));
|
|
$h = chr(0x01) . str_repeat(chr(0xFF), $nLength - 3 - strlen($h)) . $h;
|
|
|
|
if ($s != $h) {
|
|
user_error('Bad server signature');
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
|
|
}
|
|
break;
|
|
default:
|
|
user_error('Unsupported signature format');
|
|
return $this->_disconnect(NET_SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE);
|
|
}
|
|
|
|
return $this->signature_format . ' ' . base64_encode($this->server_public_host_key);
|
|
}
|
|
|
|
/**
|
|
* Returns the exit status of an SSH command or false.
|
|
*
|
|
* @return Integer or false
|
|
* @access public
|
|
*/
|
|
function getExitStatus()
|
|
{
|
|
if (is_null($this->exit_status)) {
|
|
return false;
|
|
}
|
|
return $this->exit_status;
|
|
}
|
|
|
|
/**
|
|
* Is a path includable?
|
|
*
|
|
* @return Boolean
|
|
* @access private
|
|
*/
|
|
function _is_includable($suffix)
|
|
{
|
|
foreach (explode(PATH_SEPARATOR, get_include_path()) as $prefix) {
|
|
$ds = substr($prefix, -1) == DIRECTORY_SEPARATOR ? '' : DIRECTORY_SEPARATOR;
|
|
$file = $prefix . $ds . $suffix;
|
|
|
|
if (file_exists($file)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
}
|