Network Security Management with Firewalls
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1 Network Security Management with Firewalls Stephen P. Cooper Advanced Security Projects Computer Security Technology Center Lawrence Livermore National Laboratory Computer Security Practitioners Conference February 7, 1996 UCRL-MI Work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract W-7405-ENG-48. Reference to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the U.S. Department of Energy or the University of California.
2 This is your network... Proprietary Data Personnel Data Sensitive Data
3 This is your network on the Internet Sensitive Data VIRUS Trojan Horse Personnel Data Proprietary Data
4 Unless you have a Firewall Proprietary Data Personnel Data Sensitive Data Computer Security Technology Center 4
5 Why a firewall? You have information and resources that need protection. You have a need to connect to a network that has a different view of the world. Strong host-based security is too costly or difficult. Computer Security Technology Center 5
6 On the WWW, everyone is a neighbor Computer Security Technology Center 6
7 A Firewall is... A gateway between a trusted network and a less trusted one. An enforcer of security policy. A system designed to: Control external access to company data and resources. Control internal access to Internet systems and services. Provide a security and monitoring choke point. Computer Security Technology Center 7
8 ... or in a nutshell A firewall is a tool for managing and controlling traffic that crosses a network boundary. Computer Security Technology Center 8
9 Reality Check! The purpose of a business is to provide some product or service. The purpose of security is to reduce some of the risks associated with operating and maintaining a business. The purpose of a firewall is to support some aspects of the security policy. Computer Security Technology Center 9
10 Reality Check, Part 2! A firewall, as a chokepoint, may also be a single point-of-failure. Reliability, performance become issues. Therefore, the firewall s status may quickly be elevated to a mission critical one. Computer Security Technology Center 10
11 How do you set up a firewall? Products Services Policies Magic Requirements Resources Our goal is to try and reduce the magic. Computer Security Technology Center 11
12 Develop a policy and requirements Need to understand the assets to be protected and the threats to those assets. Need to understand the user requirements. The target is probably somewhere between the two. Security Too Weak Too Strong Computer Security Technology Center 12
13 Assess the threats vs. assets High Threat External Internal Low Computer Security Technology Center 13
14 What about protocols? The good... Telnet...the bad... Any UDP, finger...and the ugly. FTP, X11 Actually depends on your point of view. Computer Security Technology Center 14
15 Understand your resources Financial. Time. Technical expertise. Systems used. Computer Security Technology Center 15
16 To build your own... It takes a certain level of expertise in computer network security, UNIX system administration, and programming. The FWTK is meant for individuals who: know C know TCP/IP know UNIX as a system manager have built C software packages on UNIX systems. Frederick Avolio, Trusted Information Systems Computer Security Technology Center 16
17 Products and Services There are over 40 commercial firewalls offering a wide range of configurations and capabilities. There is a wide range of services available. Computer Security Technology Center 17
18 Configurations range from simple to complex Application Gateway Router Application Gateway Dual-homed Gateway Screened Host Gateway Router Application Gateway(s) Router Screened Subnet Gateway Computer Security Technology Center 18
19 Here is a physical sample... External Network Screening Router Internal Network Bastion Host Computer Security Technology Center 19
20 ...and here is the logical view Remote User? Internal Services Secure Authentication Bastion Host Proxy Services Screening Router Remote Services Internal User Computer Security Technology Center 20
21 White House Firewall* DEC SEAL, Gauntlet based. 9 months and $275K. 2 full-time Secret Service agents for administration K mail messages per day, filtered for content. * From a presentation by Bill Hancock to the DECUS Bay LUG, 7/10/95. Computer Security Technology Center 21
22 Build your own? There is ample software available: TIS Firewall Toolkit (FWTK) Freestone from SOS Corp. Socks Screend KarlBridge (demo and commercial), DrawBridge S/Key Others Computer Security Technology Center 22
23 Other Sources: Commercial Services Internet Providers Consultants Commercial Products Screening Routers Software Operating Systems Hardware Services Computer Security Technology Center 23
24 How to select Start with the go/no-go decisions: Will a particular product or service support your security policy? Do you have the necessary resources? Are there other show stoppers? Performance (T1, Ethernet, FDDI, etc.) Protocols supported (Appletalk, DECnet) Encryption Computer Security Technology Center 24
25 How to select (cont.) For the rest, balance your priorities against the offerings of the target products. Priorities Support Reliability Cost Flexibility User Interface Offerings GUI Reboot for changes 24h phone support $20, /year 2 year MTBF, 1 day MTTR Computer Security Technology Center 25
26 Some Selection Criteria Protocols Hardware and Operating Systems Management Interfaces User Authentication Encryption Firewall Validation Services Computer Security Technology Center 26
27 A Sampling of Products Sidewinder Gauntlet Digital s Firewall Service (formerly SEAL) Firewall-1 Internet Site Patrol Firewall-Plus SunScreen Computer Security Technology Center 27
28 Future directions Better integration of security components. Management, host-based security, intrusion detection. CSTC and partners have several research projects on the table. Standards Firewall management, cooperative firewalls. Performance Computer Security Technology Center 28
29 References: Cheswick, William R. and Steven M. Bellovin. Firewalls and Internet Security: Repelling the Wily Hacker, Addison-Wesley, Chapman, Brent and Elizabeth Zwicky. Building Internet Firewalls, O Reilly & Associates, Hare, R. Christopher and Karanjit Siyan. Internet Firewalls and Network Security, New Riders Publishing, Computer Security Technology Center 29
30 On the WWW: The Firewall Report, by Outlink Market Research ( contains over 600 pages reviewing over 40 firewall products. Catherine Fulmer maintains a list of firewall products at: The Firewalls Mailing List: Send to firewalls-request@greatcircle.com with subscribe firewalls as the message body. Computer Security Technology Center 30
31 Crossing the finish line There are many good products out there, with more emerging. Avoid analysis paralysis. Don t fall into a false sense of security. We (the CSTC) are here to help you reach your security goals through our various services and projects, but... Computer Security Technology Center 31
32 ...We need your help! Feedback on commercial products and services. Information on what products and services you are using so that we may serve as an information broker. Visit: cstc/cstchome.html CSTC CONTACTS Computer Security Technology Center 32
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