Manual Firewalls. Jumpstart for Network and Systems Administrators

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Firewall protection from a high-end perspective To ensure good protection, one has to make sure that the system is not breakable using backdoors or security weaknesses.

This means that security must be ensured at all levels, using both IP checks and application proxies. The solution must provide a complete set of protection facilities in order to grant or deny access in accordance with the security policy and prevent information disclosure. This includes strong authentication capabilities to ensure that the users are whom they claim to be and the data encryption capabilities. It must also be able to operate with content security solutions in order to filter viruses, malicious Java applets, or ActiveX controls and complement firewall access control protection with strong encryption to build virtual private networks and extended audit and alert facilities.

Finally, it must be able to operate with other security solutions through a set of open interfaces. This book also provides the fundamental knowledge you need to analyze risks to your system and implement a workable firewall security policy that protects your information assets from potential intrusion, damage, or theft. Through extensive hands-on examples field and trial experiments and case studies, you will gain the knowledge and skills required to master the deployment of firewall security systems to thwart potential attacks.

Scope Throughout the book, extensive hands-on examples provide you with practical experience in firewall security analysis and reporting as well as future directions.

Computer Systems & Network Administration

In addition to advanced firewall security technology considerations in commercial organizations and governments, the book addresses, but is not limited to, the following line items as part of the discovery of electronic evidence: First, you will learn how to analyze your exposure to security threats and protect your organization s systems and data; manage risks emanating from inside the organization and from the Internet and extranets; protect network users from hostile applications and viruses; reduce your susceptibility to an attack by deploying firewalls, data encryption, decryption, and other countermeasures; and identify the security risks that need to be addressed in a security and firewall security policy.

Second, there are chapters on how to gain practical experience in analyzing the security risks and countermeasures that need to be addressed in your organization.

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This includes maintaining strong authentication and authenticity, preventing eavesdropping, retaining integrity of information, evaluating the strength of user passwords, selecting a firewall topology, and evaluating computer and hacker ethics. This book leaves little doubt that the field of firewall security is about to evolve even further. This area of knowledge is now being researched, organized, and taught. No question, this book will. With regard to firewall security, this book is primarily targeted at those in government and law enforcement who require the fundamental skills to develop and implement security schemes designed to protect their organizations information from attacks, including managers, network and systems administrators, technical staff, and support personnel.

This also includes those involved in securing Web sites, including Web developers; Web masters; and systems, network, and security administrators. Organization of this book This book is organized into nine sections, including 12 appendixes including a glossary of firewall security terms and acronyms. Section I: overview of firewall technology Section I discusses firewall security fundamentals, types of firewall security policies, and firewall security types.

Chapter 1, Firewalls: What Are They? Chapter 2, Type of Firewall Security Policy, will help the responsible manager and firewall administrator create useful policy for the firewall. Chapter 3, Firewall Types, is intended to present a brief overview of firewall types available and the relative advantages and disadvantages of each. Section II: firewall topologies The second section of this book discusses how to choose the right firewall and firewall topologies themselves.

Chapter 4, Choosing the Right Firewall, explores, in depth, the aspects of security and exemplifies several existing solutions.

Firewalls: Jumpstart for Network and Systems Administrators

Chapter 6, Installation Preparation, is a discussion on how to install a firewall and the tools that are needed. This chapter also illustrates the need and the methods of hardening a firewall system in order to protect it from exploitation. Chapter 7, Firewall Configuration, assumes that a firewall server has been built, its Operating System OS has been hardened, and firewall software has been installed that will allow further flexibility and management of traffic passing through the firewall.

Section IV: supporting outgoing services through firewall configuration Section IV discusses how to implement a simple policy, the management of complex web services, and content filtering. Chapter 8, Simple Policy Implementation, provides in situ deployment tactics. Chapter 9, Complex Web Services Management, specifically focuses on understanding protocol vulnerabilities, vulnerabilities of wireless access, streaming audio and video, and FTP and Telnet. Chapter 10, Content Filtering, explores the many types of content filtering in order to establish a trailhead, with a map of known routes and avenues.

Section V: secure external services provision Section V discusses the implementation of publicly accessible servers, architecture selection, and protection of external servers. Chapter 11, Publicly Accessible Servers Implementation, introduces types of server environments, remote versus self-hosted, types of web server specific attacks, and servers.


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Section VI: internal IP services protection Chapter 14, Internal IP Security Threats: Beyond the Firewall, recommends tools that will mitigate risks and make management of a layered security program easier and more efficient. Chapter 15, Network Address Translation Deployment, shows you how to set up a Linux-based personal firewall for the small office home office SOHO , broadband-attached network.

It also takes a look at several SOHO firewalls and assesses whether or not they can keep your system safe from intruders. Section VII: firewall remote access configuration Chapter 16, Privacy and Authentication Technology, offers an overview of how to address firewall privacy and authentication in a comprehensive fashion, outlining the key building blocks of a privacy and authentication implementation and offering detailed guidance for each of these areas.

Chapter 17, Tunneling: Firewall-to-Firewall, discusses how to exploit VPNs, exchange keys between firewalls, implement the IPsec tunnel mode, focus on DMZ, and keep the firewall tunneling security rules up-to-date. Section VIII: firewall management Chapter 18, Auditing and Logging, makes recommendations on how to audit your firewall and set up your firewall log activities and your firewall rulebase.

Firewalls Jumpstart for Network and Systems Administrators

Chapter 19, Firewall Administration, looks at how to report and manage incidents for firewalls. This chapter also looks at the keys to unlocking your firewall s secrets. Appendix A is a list of contributors of firewall software. Appendix B is a worldwide survey of firewall products. Appendix C is a list of firewall companies. Appendix D lists commercial products or consultants who sell or service firewalls.

Appendix E discusses how to establish your organization s security. Appendix F discusses how network interconnections are a major point of vulnerability. Appendix G discusses how to deter masqueraders and ensure authenticity. Appendix H discusses how to prevent eavesdropping to protect your privacy. Appendix I discusses how to thwart counterfeiters and forgery to retain integrity. Appendix J discusses how to avoid disruption of service to maintain availability. Appendix K discusses how to develop your security policy.

References :

The book ends with a glossary of firewall-security related terms and acronyms. This book uses several conventions to help you find your way around and to help you find important sidebars, facts, tips, notes, cautions, and warnings.


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  8. I owe each a debt of gratitude and want to take this opportunity to offer my sincere thanks. A very special thanks to my editor and publisher Theron Shreve, without whose continued interest and support this book would not have been possible. Henriquez, whose fine editorial work has been invaluable. Thanks also to my marketing manager, Georgina Edwards, whose efforts on this book have been greatly appreciated.

    Finally, thanks to all of the other people at Elsevier Digital Press whose many talents and skills are essential to a finished book. Thanks to my wife, Bee Vacca, for her love, her help, and her understanding of my long work hours. Finally, a very, very special thanks to Michael Erbschloe for writing the foreword.

    Firewalls: Jumpstart for Network and Systems Administrators by John R. Vacca

    Vacca I would like to extend thanks to the many people who have asked me to support their technology over the years. I enjoy working with each and every one of them, learning about them, exploring new possibilities, and helping them create new opportunities. Without them, my contributions would not have been possible; this is a book about them. I would like to thank my son, Ethan Ellis, for the calm and quiet nights and for his laughter and his smiles, which are worth a dozen pots of coffee. Additional thanks to Keith Roberts and his team for his hard work and for being such a great listener.

    And of course, I would like to thank my coauthor, John Vacca, and publisher, Theron Shreve, for the opportunity to write and to work with them on this project over the past three years. Chapter objectives Showing the components of a firewall Showing what firewalls can and cannot do Comparing firewall types Using application proxies Showing the four-way security model Today, when an organization connects its private network to the Internet, security has to be a primary concern.

    In the past, before the widespread interest in the Internet, most network administrators were concerned about attacks on their networks from within, perhaps from disgruntled workers. But for most organizations now connecting to the Internet and big business and big money moving toward electronic commerce at warp speed, the motive for mischief from outside is growing rapidly and creating a major security risk to enterprise networks. Reacting to this threat, an increasing number of network administrators are installing the latest firewall technology as a first line of defense in the form of a barrier against outside attacks.

    These firewall gateways provide a choke point at which security and auditing can be imposed. They allow access to resources on the Internet from within the organization while providing controlled access from the Internet to hosts inside the virtual private network VPN. It comes bundled with many of today s firewall devices. In other words, a VPN is ideal for businesses with multiple offices or remote workers who need access to resources within the corporate network.

    Rather than maintaining separate and expensive private network and remote access servers to provide access to remote workers and offices, a VPN allows a company to leverage the Internet to provide secure access to employees anywhere and anytime while protecting corporate data from unauthorized access via firewall devices.

    For example, a number of systems enable you to create networks using the Internet as the medium for transporting data. These systems use encryption and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted. With that in mind, this chapter sets the stage for the rest of the book by showing the importance of firewalls as a method of protection for corporate networks. With the continued exponential growth of the Internet, the threat of attack on your network increases proportionally.

    If it is necessary for you to connect your network to the Internet, an appropriate security protocol should be chosen and implemented. This book illustrates many reasons why this is necessary, as well as a large number of different techniques to consider for your firewall solution. The bottom line is that you do not connect your network to the Internet without some sort of protection.

    Also, do not put sensitive information in a place where it can be accessed over the Internet. The firewall you decide to use will prevent most of the attacks on your network; however, firewalls will not protect against dial-in modem attacks, virus attacks, or attacks from within your company.

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    Nevertheless, a number of the security problems with the Internet can be remedied or made less serious through the use of existing and well-known techniques and controls for host security. For example, say you ve ordered a new firewall, and you want to get it running on your network ASAP. Your first reaction is probably to put every client and server behind it.