Net_SSH2::_keyboard_interactive_process PHP Method

    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 = '';
                } elseif (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;
                    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, $logged)) {
                    return false;
                }
                if (defined('NET_SSH2_LOGGING') && NET_SSH2_LOGGING == NET_SSH2_LOG_COMPLEX) {
                    $this->message_number_log[count($this->message_number_log) - 1] = str_replace('UNKNOWN', 'NET_SSH2_MSG_USERAUTH_INFO_RESPONSE', $this->message_number_log[count($this->message_number_log) - 1]);
                }
                /*
                   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;
    }