cakePHP 2.x connecting to a remote database using key

I need to get connected with a mysql database on a different server, i have the RSA key to connect to the server and i also have all the credentials needed to connect to the database, and using this following codes, i am able to get connected perfectly

try {
    $this->db = new PDO("mysql:host=$this->host;port=$this->port;dbname=$this->dbname", $this->sqlUser, $this->sqlPass);
} catch (Exception $e) {
    shell_exec("ssh -i /path/to/rsa/key/the_key myusername@some.ip.address -L3307:localhost:3306 -N");
};

try {
    $this->db = new PDO("mysql:host=$this->host;port=$this->port;dbname=$this->dbname", $this->sqlUser, $this->sqlPass);
} catch (Exception $e) {
    die($e->getMessage() . " (line:" . __LINE__ . ")");
};

however, i am building the application using cakePHP 2.x, how can i connect to that remote server and database using cakePHP's configuration?

Thanks

Okay i manage to do this by creating an extended class called FarAwayMysql.php under app/Model/DataSource/Database

App::uses('DboSource', 'Model/Datasource');

class FarAwayMysql extends DboSource {
public $description = "Faraway MySQL DBO Driver";

protected $_baseConfig = array(
    'persistent' => true,
    'host' => 'localhost',
    'login' => 'root',
    'password' => '',
    'database' => 'cake',
    'port' => '3306',
    'rsa' => '',
    'remote_username' => '',
    'remote_ip' => ''
);
protected $_connection = null;

protected $_useAlias = true;

public function connect() {
    $config = $this->config;
    $this->connected = false;
    try {
        $flags = array(
            PDO::ATTR_PERSISTENT => $config['persistent'],
            PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true,
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
        );
        if (!empty($config['encoding'])) {
            $flags[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET NAMES ' . $config['encoding'];
        }
        if (empty($config['unix_socket'])) {
            $dsn = "mysql:host={$config['host']};port={$config['port']};dbname={$config['database']}";
        } else {
            $dsn = "mysql:unix_socket={$config['unix_socket']};dbname={$config['database']}";
        }
        $this->_connection = new PDO(
            $dsn,
            $config['login'],
            $config['password'],
            $flags
        );
        $this->connected = true;
    } catch (PDOException $e) {
        echo "ssh -i {$config['rsa']} {$config['remote_username']}@{$config['remote_ip']} -L3307:{$config['host']}:3306 -N";
        shell_exec("ssh -i {$config['rsa']} {$config['remote_username']}@{$config['remote_ip']} -L3307:{$config['host']}:3306 -N");
    }


    try {
        $flags = array(
            PDO::ATTR_PERSISTENT => $config['persistent'],
            PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true,
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
        );
        if (!empty($config['encoding'])) {
            $flags[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET NAMES ' . $config['encoding'];
        }
        if (empty($config['unix_socket'])) {
            $dsn = "mysql:host={$config['host']};port={$config['port']};dbname={$config['database']}";
        } else {
            $dsn = "mysql:unix_socket={$config['unix_socket']};dbname={$config['database']}";
        }
        $this->_connection = new PDO(
            $dsn,
            $config['login'],
            $config['password'],
            $flags
        );
        $this->connected = true;
    } catch (PDOException $e) {             
        throw new MissingConnectionException(array(
            'class' => get_class($this),
            'message' => $e->getMessage()
        ));
    }

    $this->_useAlias = (bool)version_compare($this->getVersion(), "4.1", ">=");

    return $this->connected;
}
}

by adding 3 new configs

protected $_baseConfig = array(
    'persistent' => true,
    'host' => 'localhost',
    'login' => 'root',
    'password' => '',
    'database' => 'cake',
    'port' => '3306',
    'rsa' => '',
    'remote_username' => '',
    'remote_ip' => ''
);

and then on your app/Config/database.php, it would be

public $faraway = array(
    'datasource' => 'Database/FarAwayMysql',
    'persistent' => false,
    'host' => 'localhost',
    'login' => 'faraway_username',
    'password' => 'faraway_password',
    'database' => 'faraway_db_name',
    'port' => '',
    'rsa' => 'path/to/rsa/key',
    'remote_username' => 'your_username',
    'remote_ip' => 'your.ip.address'
);