Firewalls and Internet Security: Repelling the Wiley Hacker, 2nd Edition
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The best-selling first edition of Firewalls and Internet Security became
the bible of Internet security by showing readers how to think about threats
and solutions. The completely updated and expanded second edition defines the
security problems companies face in today's Internet, identifies the weaknesses
of the most popular security technologies, and illustrates the ins and outs
of deploying an effective firewall. Readers learn how to plan and execute a
security strategy that allows easy access to Internet services while defeating
even the wiliest of hackers.
Firewalls and Internet Security, Second Edition, draws upon the
authors' experiences as researchers in the forefront of their field since the
beginning of the Internet explosion.
The book begins with an introduction to their philosophy of Internet security.
It progresses quickly to a dissection of possible attacks on hosts and networks
and descriptions of the tools and techniques used to perpetrate these attacks
and to prevent them. The focus then shifts to firewalls and virtual private
networks (VPNs), providing a step-by-step guide to firewall deployment. Readers
are immersed in the real-world practices of Internet security through an examination
of problems and practices on today's intranets and discussions of the deployment
of a hacking-resistant host and of intrusion detection systems (IDS). The authors
scrutinize secure communications over insecure networks and conclude with their
predictions for the future of firewalls and Internet security. Appendices provide
an introduction to cryptography and a list of resources readers can rely on
to track further developments in Internet security. The book's Web site will
update these resources.
Armed with the authors' hard-won knowledge of how to fight off hackers, readers
of Firewalls and Internet Security, Second Edition, can make the
security decisions that will make the Internet--and their computers--safer.
Table of Contents
Preface to the Second Edition.
Preface to the First Edition.
I. GETTING STARTED.
1. Introduction.
Security Truisms.
Picking a Security Policy.
Host-Based Security.
Perimeter Security.
Strategies for a Secure Network.
The Ethics of Computer Security.
WARNING.
2. A Security Review of Protocols: Lower Layers.
Basic Protocols.
Managing Addresses and Names.
IP Version 6.
Network Address Translators.
Wireless Security.
3. Security Review: The Upper Layers.
Messaging.
Internet Telephony.
RPC-Based Protocols.
File Transfer Protocols.
Remote Login.
Simple Network Management Protocol—SNMP.
The Network Time Protocol.
Information Services.
Proprietary protocols.
Peer-to-Peer Networking.
The X11 Window System.
The Small Services.
4. The Web: Threat or Menace?
The Web Protocols.
Risks to the Clients.
Risks to the Server.
Web Servers vs. Firewalls.
The Web and Databases.
Parting Thoughts.
II. THE THREATS.
5. Classes of Attacks.
Stealing Passwords.
Social Engineering.
Bugs and Backdoors.
Authentication Failures.
Protocol Failures.
Information Leakage.
Exponential Attacks—Viruses and Worms.
Denial-of-Service Attacks.
Botnets.
Active Attacks.
6. The Hacker's Workbench, and Other Munitions.
Introduction.
Hacking Goals.
Scanning a Network.
Breaking into the Host.
The Battle for the Host.
Covering Tracks.
Metastasis.
Hacking Tools.
Tiger Teams.
III. SAFER TOOLS AND SERVICES.
7. Authentication.
Remembering Passwords.
Time-Based One-Time Passwords.
Challenge/Response One-Time Passwords.
Lamport's One-Time Password Algorithm.
Smart Cards.
Biometrics.
RADIUS.
SASL: An Authentication Framework.
Host-to-Host Authentication.
PKI.
8. Using Some Tools and Services.
Inetd—Network Services.
Ssh—Terminal and File Access.
Syslog.
Network Administration Tools.
Chroot—Caging Suspect Software.
Jailing the Apache Web Server.
Aftpd—A Simple Anonymous FTP Daemon.
Mail Transfer Agents.
POP3 and IMAP.
Samba: An SMB Implementation.
Taming Named.
Adding SSL Support with sslwrap.
IV. FIREWALLS AND VPNS.
9. Kinds of Firewalls.
Packet Filters.
Application-Level Filtering.
Circuit-Level Gateways.
Dynamic Packet Filters.
Distributed Firewalls.
What Firewalls Cannot Do.
10. Filtering Services.
Reasonable Services to Filter.
Digging for Worms.
Services We Don't Like.
Other Services.
Something New.
11. Firewall Engineering.
Rulesets.
Proxies.
Building a Firewall from Scratch.
Firewall Problems.
Testing Firewalls.
12. Tunneling and VPNs.
Tunnels.
Virtual Private Networks (VPNs).
Software vs. Hardware.
V. PROTECTING AN ORGANIZATION.
13. Network Layout.
Intranet Explorations.
Intranet Routing Tricks.
In Host We Trust.
Belt and Suspenders.
Placement Classes.
14. Safe Hosts in a Hostile Environment.
What Do We Mean by “Secure” ?
Properties of Secure Hosts.
Hardware Configuration.
Field Stripping a Host.
Loading New Software.
Administering a Secure Host.
Skinny-Dipping: Life Without a Firewall.
15. Intrusion Detection.
Where to Monitor.
Types of IDS.
Administering an IDS.
IDS Tools.
VI. LESSONS LEARNED.
16. Une Soirie avec Berferd.
Introduction.
Unfriendly Acts.
An Evening with Berferd.
The Day After.
The Jail.
Tracing Berferd.
Berferd Comes Home.
17. The Taking of Clark.
Prelude.
Clark.
Crude Forensics.
Examining Clark.
The Password File.
How Did They Get In?
Better Forensics.
Lessons Learned.
18. Secure Communications over Insecure Networks.
An Introduction to Cryptography.
The Kerberos Authentication System.
Link-Level Encryption.
Network-Level Encryption.
Application-Level Encryption.
19. Where Do We Go from Here?
IPv6.
DNSsec.
Internet Ubiquity.
Internet Security.
Conclusion.
A. An Introduction to Cryptography.
Introduction.
B. Keeping up.
Bibliography.
List of Bombs.
List of Acronyms.
Index
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