Chapter 1 Why Internet Firewalls?
1.1 What Are You Trying to Protect?
1.2 What Are You Trying to Protect Against?
1.3 Who Do You Trust?
1.4 How Can You Protect Your Site?
1.5 What Is an Internet Firewall?
1.6 Religious Arguments
Chapter 2 Internet Services
2.1 Secure Services and Safe Services
2.2 The World Wide Web
2.3 Electronic Mail and News
2.4 File Transfer, File Sharing, and Printing
2.5 Remote Access
2.6 Real-Time Conferencing Services
2.7 Naming and Directory Services
2.8 Authentication and Auditing Services
2.9 Administrative Services
2.10 Databases
2.11 Games
3 Security Strategies
3.1 Least Privilege
3.2 Defense in Depth
3.3 Choke Point
3.4 Weakest Link
3.5 Fail-Safe Stance
3.6 Universal Participation
3.7 Diversity of Defense
3.8 Simplicity
3.9 Security Through Obscurity
Part II : Building Firewalls
Chapter 4 Packets and Protocols
4.1 What Does a Packet Look Like?
4.2 IP
4.3 Protocols Above IP
4.4 Protocols Below IP
4.5 Application Layer Protocols
4.6 IP Version 6
4.7 Non-IP Protocols
4.8 Attacks Based on Low-Level Protocol Details
Chapter 5 Firewall Technologies
5.1 Some Firewall Definitions
5.2 Packet Filtering
5.3 Proxy Services
5.4 Network Address Translation
5.5 Virtual Private Networks
Chapter 6 Firewall Architectures
6.1 Single-Box Architectures
6.2 Screened Host Architectures
6.3 Screened Subnet Architectures
6.4 Architectures with Multiple Screened Subnets
6.5 Variations on Firewall Architectures
6.6 Terminal Servers and Modem Pools
6.7 Internal Firewalls
Chapter 7 Firewall Design
7.1 Define Your Needs
7.2 Evaluate the Available Products
7.3 Put Everything Together
Chapter 8 Packet Filtering
8.1 What Can You Do with Packet Filtering?
8.2 Configuring a Packet Filtering Router
8.3 What Does the Router Do with Packets?
8.4 Packet Filtering Tips and Tricks
8.5 Conventions for Packet Filtering Rules
8.6 Filtering by Address
8.7 Filtering by Service
8.8 Choosing a Packet Filtering Router
8.9 Packet Filtering Implementations for General-Purpose Computers
8.10 Where to Do Packet Filtering
8.11 What Rules Should You Use?
8.12 Putting It All Together
Chapter 9 Proxy Systems
9.1 Why Proxying?
9.2 How Proxying Works
9.3 Proxy Server Terminology
9.4 Proxying Without a Proxy Server
9.5 Using SOCKS for Proxying
9.6 Using the TIS Internet Firewall Toolkit for Proxying
9.7 Using Microsoft Proxy Server
9.8 What If You Can't Proxy?
Chapter 10 Bastion Hosts
10.1 General Principles
10.2 Special Kinds of Bastion Hosts
10.3 Choosing a Machine
10.4 Choosing a Physical Location
10.5 Locating Bastion Hosts on the Network
10.6 Selecting Services Provided by a Bastion Host
10.7 Disabling User Accounts on Bastion Hosts
10.8 Building a Bastion Host
10.9 Securing the Machine
10.10 Disabling Nonrequired Services
10.11 Operating the Bastion Host
10.12 Protecting the Machine and Backups
Chapter 11 Unix and Linux Bastion Hosts
11.1 Which Version of Unix?
11.2 Securing Unix
11.3 Disabling Nonrequired Services
11.4 Installing and Modifying Services
11.5 Reconfiguring for Production
11.6 Running a Security Audit
Chapter 12 Windows NT and Windows 2000 Bastion Hosts
12.1 Approaches to Building Windows NT Bastion Hosts
12.2 Which Version of Windows NT?
12.3 Securing Windows NT
12.4 Disabling Nonrequired Services
12.5 Installing and Modifying Services
Part III Internet Services
13 Internet Services and Firewalls
13.1 Attacks Against Internet Services
13.2 Evaluating the Risks of a Service
13.3 Analyzing Other Protocols
13.4 What Makes a Good Firewalled Service?
13.5 Choosing Security-Critical Programs
13.6 Controlling Unsafe Configurations
Chapter 14 Intermediary Protocols
14.1 Remote Procedure Call (RPC)
14.2 Distributed Component Object Model (DCOM)
14.3 NetBIOS over TCP/IP (NetBT)
14.4 Common Internet File System (CIFS) and Server Message Block (SMB)
14.5 Common Object Request Broker Architecture (CORBA) and Internet Inter-Orb Protocol (IIOP)
14.6 ToolTalk
14.7 Transport Layer Security (TLS) and Secure Socket Layer (SSL)
14.8 The Generic Security Services API (GSSAPI)
14.9 IPsec
14.10 Remote Access Service (RAS)
14.11 Point-to-Point Tunneling Protocol (PPTP)
14.12 Layer 2 Transport Protocol (L2TP)
Chapter 15 The World Wide Web
15.1 HTTP Server Security
15.2 HTTP Client Security
15.3 HTTP
15.4 Mobile Code and Web-Related Languages
15.5 Cache Communication Protocols
15.6 Push Technologies
15.7 RealAudio and RealVideo
15.8 Gopher and WAIS
Chapter 16 Electronic Mail and News
16.1 Electronic Mail
16.2 Simple Mail Transfer Protocol (SMTP)
16.3 Other Mail Transfer Protocols
16.4 Microsoft Exchange
16.5 Lotus Notes and Domino
16.6 Post Office Protocol (POP)
16.7 Internet Message Access Protocol (IMAP)
16.8 Microsoft Messaging API (MAPI)
16.9 Network News Transfer Protocol (NNTP)
Chapter 17. File Transfer, File Sharing, and Printing
17.1 File Transfer Protocol (FTP)
17.2 Trivial File Transfer Protocol (TFTP)
17.3 Network File System (NFS)
17.4 File Sharing for Microsoft Networks
17.5 Summary of Recommendations for File Sharing
17.6 Printing Protocols
17.7 Related Protocols
Chapter 18 Remote Access to Hosts
18.1 Terminal Access (Telnet)
18.2 Remote Command Execution
18.3 Remote Graphical Interfaces
Chapter 19 Real-Time Conferencing Services
19.1 Internet Relay Chat (IRC)
19.2 ICQ
19.3 talk
19.4 Multimedia Protocols
19.5 NetMeeting
19.6 Multicast and the Multicast Backbone (MBONE)
Chapter 20. Naming and Directory Services
20.1 Domain Name System (DNS)
20.2 Network Information Service (NIS)
20.3 NetBIOS for TCP/IP Name Service and Windows Internet Name Service
20.4 The Windows Browser
20.5 Lightweight Directory Access Protocol (LDAP)
20.6 Active Directory
20.7 Information Lookup Services
Chapter 21 Authentication and Auditing Services
21.1 What Is Authentication?
21.2 Passwords
21.3 Authentication Mechanisms
21.4 Modular Authentication for Unix
21.5 Kerberos
21.6 NTLM Domains
21.7 Remote Authentication Dial-in User Service (RADIUS)
21.8 TACACS and Friends
21.9 Auth and identd
Chapter 22 Administrative Services
22.1 System Management Protocols
22.2 Routing Protocols
22.3 Protocols for Booting and Boot-Time Configuration
22.4 ICMP and Network Diagnostics
22.5 Network Time Protocol (NTP)
22.6 File Synchronization
22.7 Mostly Harmless Protocols
23 Databases and Games
23.1 Databases
23.2 Games
Chapter 24 Two Sample Firewalls
24.1 Screened Subnet Architecture
24.2 Merged Routers and Bastion Host Using General-Purpose Hardware
Part IV : Keeping Your Site Secure
Chapter 25 Security Policies
25.1 Your Security Policy
25.2 Putting Together a Security Policy
25.3 Getting Strategic and Policy Decisions Made
25.4 What If You Can't Get a Security Policy?
Chapter 26 Maintaining Firewalls
26.1 Housekeeping
26.2 Monitoring Your System
26.3 Keeping up to Date
26.4 How Long Does It Take?
26.5 When Should You Start Over?
27 Responding to Security Incidents 481
27.1 Responding to an Incident
27.2 What to Do After an Incident
27.3 Pursuing and Capturing the Intruder
27.4 Planning Your Response
27.5 Being Prepared
V Appendixes
A Resources
A.1 Web Pages
A.2 FTP Sites
A.3 Mailing Lists
A.4 Newsgroups
A.5 Response Teams
A.6 Other Organizations
A.7 Conferences
A.8 Papers
A.9 Books
B Tools
B.1 Authentication Tools
B.2 Analysis Tools
B.3 Packet Filtering Tools
B.4 Proxy Systems Tools
B.5 Daemons
B.6 Utilities
C Cryptography
C.1 What Are You Protecting and Why?
C.2 Key Components of Cryptographic Systems
C.3 Combined Cryptography
C.4 What Makes a Protocol Secure?
C.5 Information About Algorithms
Colophon
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