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<?php
/*
* Looking Glass - An easy to deploy Looking Glass
* Copyright (C) 2014-2017 Guillaume Mazoyer <gmazoyer@gravitons.in>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
ini_set('include_path', ini_get('include_path').':./libs/phpseclib-1.0.8');
require_once('ssh.php');
require_once('telnet.php');
/**
* This class needs to be extended by every class implementing an
* authentication mecanism.
*
* It provides the basis to interact with an authentication mecanism.
*
* When implementing an authentication mecanism, the subclass will need to
* override several methods that define if the configuration is correct and
* how to connect, disconnect and send a command to the host.
*/
abstract class Authentication {
/**
* The configuration array containing information needed by the
* authentication mecanism.
*/
protected $config;
/**
* Build a new object to manipulate the authentication mecanism.
*
* It will also check if the configuration is correct before doing the
* instanciation.
*
* @param array $config the configuration for the authentication mecanism.
*/
public function __construct($config) {
$this->config = $config;
$this->check_config();
}
/**
* Method that check if the configuration is correct.
*
* If the validation does not pass, this method must throw an Exception.
*/
protected abstract function check_config();
/**
* Method that provides the needed logic to connect to a host.
*/
public abstract function connect();
/**
* Method that provides the needed logic to disconnect from a host.
*/
public abstract function disconnect();
/**
* Method that provides the needed logic to send a given command to a host.
*
* @param string $command the command to be sent to the host.
*/
public abstract function send_command($command);
/**
* Method called when the object is destructed.
*
* It will ensure that the disconnection has been done before destructing
* the object.
*/
public function __destruct() {
$this->disconnect();
}
/**
* Method that decides which authentication method to instanciate based on a
* given configuration.
*
* Note: no instanciation of authentication mecanism class should be done
* elsewhere than here.
*
* @param array $config the configuration for the authentication
* mecanism.
* @return Authentication the authentication mecanism to be used.
*/
public static final function instance($config) {
switch ($config['auth']) {
case 'ssh-password':
case 'ssh-key':
return new SSH($config);
case 'telnet':
return new Telnet($config);
default:
print('Unknown authentication mecanism "'.$config['auth'].'"."');
return null;
}
}
}
// End of authentication.php
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