Built-in policy installer in Firewall Builder GUI uses ssh client to connect to the firewall. While ssh client is standard on all Linux and BSD systems, as well as Mac OS X, it does not come with Windows. In order to be able to use Firewall Builder GUI to install policy on Windows, you need to download ssh client PuTTY and configure fwbuilder to use it. Note: PuTTY is free software.

Starting with version 4.0.2, Firewall Builder includes putty ssh client utilities plink.exe and pscp.exe in Windows package. You do not need to do any additional configuration if you use fwbuilder v4.0.2 on Windows and can skip this section. However if you already have putty on your machine or want to use different ssh client, then follow instructions in this section to see how you can configure fwbuilder to use it.


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Before you try to use fwbuilder installer with plink.exe and pscp.exe, test it from the command line to make sure you can log in to your firewall. If this is the first time you've tried to log into the firewall machine using putty.exe, plink.exe or pscp.exe, then the program will discover a new host key, ask you if it is correct and ask if you want to save it in cache. There are lots of resources on the Internet that explain what this means and how you should verify key accuracy before you accept it. If the key is already known to the program it will not ask you about it and will just proceed to the part where it asks you to enter a password. Enter the password and press Enter to see if you can log in.

You could also get very granular with the command line tool iptables. Of course most administrators do not have the time or inclination to deal with such heavy-hitting tools as iptables (if you do have the time, however, iptables is incredibly powerful). So where do you go to get something user-friendly AND powerful? One such option is fwbuilder.

Fwbuilder is a powerful firewall creation tool that works by adding objects to build a customized firewall. An object can be just about anything from a firewall, a library, a host, interface, address, DNS name, etc. The idea is you piece objects together to form a cohesive whole that works together to form a complete firewall. The only problem most run into is, when you fire up fwbuilder, where do you start? It may seem a bit confusing at first, but you know where the first step is, the rest of the journey is pretty clear.

I will touch briefly on installing fwbuilder, because it will not be found on your default system. And although you will find fwbuilder in your respository, it will be an outdated version. So to install the latest version first open up your /etc/apt/sources.list file and add the following (Note: I am installing this on Ubuntu 9.04.):

When you start up fwbuilder the main window (see Figure 1) will not seem very intuitive. The first thing you need to do is create a new firewall. To create a new firewall click the Object drop-down which is the icon to the immediate left of the User drop-down. Or you click the Object menu and select New Object (which will open the Object drop-down menu). From this drop-down select New Firewall.

Once you have completed building your firewall right click the firewall name (in my example it would be Desktop from the upper left pane) and click "Compile". This will open up a compilation wizard that is simple to walk through. The compilation will create a file with the same name as the firewall and an extension of .fw. After the compilation is complete right click the firewall name and select Install. The installation wizard is also a simple walkthrough of steps. You will have to give a user for the firewall to run under as well as the password for that user. Also you will have to select if you are going to run in test mode or not. If you are install the firewall in test mode it will not be permanent. If you install in regular mode fwbuilder will ask you how soon you want to reboot your machine (so the firewall can take effect.) I suggest running in test most first. If this works then go back through the Install process and allow for full installation (including reboot).

Now start fwbuilder.exe. Choose "Create new project file". Right click on "Firewalls" and choose "New Firewall". Enter the name of the new opject below: something like "my firewall". Choose firewall software is running "iptables". Choose OS the new firewall runs on: "Linksys/Sveasoft". Check "Use preconfigured tamplate firewall objects". Choose template "linksys firewall" and press Finish.

fwbuilder works with files created using iptables-save - which is NOT part of DD-WRT.If you download the ipkg iptables-utils which contains iptables-save & iptables-restore, you will find they do not work, and give you error messages such as these :

article continues the series of articles on Fireall Builder, a graphical firewall configuration and management tool that supports many Open Source firewall platforms as well as Cisco IOS access lists and Cisco ASA (PIX). Firewall Builder was introduced on this site earlier with articles Getting Started With Firewall Builder, more information on Firewall Builder, pre-built binary packages and source code, documentation and Firewall Builder Cookbook can be found on the project web site at www.fwbuilder.org. Watch Project Blog for announcements and articles on all aspects of using Firewall Builder.

chmod g+w fwadmin /etc/fwConfigure sudo to permit user fwadmin execute firewall script and a couple of other commands used by fwbuilder policy installer. Runvisudo on the firewall to edit file/etc/sudoers as follows:Defaults:%fwbadmin !lecture , passwd_timeout=1 , timestamp_timeout=1# User alias specification

First of all, the .fwb file is portable and can be copied back and forth between Linux/BSD and windows machines. Even omments and object names entered in local language should be preserved since the GUI uses UTF-8 internally.

Installer only recognizes ssh client warning message about unknown public host keys. If you rebuld your firewall machine, which means its host key changes, ssh will print different warning message which fwbuilder installer does not recognise. In this case you will see this message in the installer progress window, but installation process will get stuck. You need to use ssh client (ssh on Unix or putty.exe on Windows) to update host key before you can use fwbuilder policy installer with this firewall again.

Downloading Firewall Builder 5.1.0.3599 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The default filename for the program's installer is fwbuilder.exe.

Have you ever wanted to configure a personal firewall for your GNU/Linux box, but were scared of the complexity of iptables? Well, I might not be able to make you a security expert, but I can show you a tool that will help you to configure your personal firewall the easy way. The secret? Firewall Builder (also known as fwbuilder for short).

Firestarter, fireshark, fwbuilder, shorewall are some of the firewall builders available. firestarter is gtk based, and might be the lightest of these. They are available through Synaptic Package Manager if not in Software Center. There is also the option of building iptables using ufw without the gui. Information about firestarter is available at . For a bit of information on firewalls and the GUI's to build them, see .

Firewall Builder is more complex than many basic firewall configuration GUIs such as Firestarter, but on the other hand, one can build very complex policies with it and fully use the flexibility and power of iptables and other supported firewalls. Firewall Builder works well both as a configuration tool for the local firewall protecting machine where fwbuilder is running and as a firewall configuration UI that manages configuration on several remote dedicated firewalls and routers.

Firewall Builder, abbreviated fwbuilder, is a universal GUI-based firewall configuration and management tool that supports the extended access lists of iptables (Netfilter), ipfilter, pf, ipfw, Cisco PIX, and CISCO routers, allowing network and sysadmins managing larger networks or hobbyists managing home-based networks to simplify management tasks. Firewall Builder is compatible with a wide range of common operating systems, including Red Hat, Mandrake, SUSE, FreeBSD, MacOS X, and Windows. e24fc04721

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