Network Security - ISA 656 Intro to Firewalls
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1 Network Security - ISA 656 Intro to s Angelos Stavrou August 28, 2007
2 What s a Intro to s What s a Why Use s? Traditional s Advantages Philosophies Devices examining traffic making access control decisions Divide the world between trusted and not Only authorized traffic is allowed to pass Act as Barrier between us and them. Limits communication from the outside world. The outside world can be another part of the same organization. Only a very few machines exposed to attack. 2 / 17
3 Why Use s? Intro to s What s a Why Use s? Traditional s Advantages Philosophies Most hosts have security holes. Proof: Most software is buggy. Therefore, most security software has security bugs. s run much less code, and hence have few bugs (and holes). s can be professionally (and hence better) administered. 3 / 17
4 Why Use s? Intro to s What s a Why Use s? Traditional s Advantages Philosophies s run less software, with more logging and monitoring. They enforce the partition of a network into separate security domains. Without such a partition, a network acts as a giant virtual machine, with an unknown set of privileged and ordinary users. 4 / 17
5 Traditional s Intro to s What s a Why Use s? Traditional s Advantages Philosophies Passports are (generally) checked at the border. My office doesn t have a door direct to the outside. My bedroom doesn t have a real lock. But a bank still has a vault... 5 / 17
6 Intro to s What s a Why Use s? Traditional s Advantages Philosophies Network Protocols Network security is not the problem. s are not a solution to network problems. They are a network response to a host security problem. More precisely, they are a response to the dismal state of software engineering; taken as a whole, the profession does not know how to produce software that is secure, correct, and easy to administer. Consequently, better network protocols will not obviate the need for firewalls. The best cryptography in the world will not guard against buggy code. 6 / 17
7 Advantages Intro to s What s a Why Use s? Traditional s Advantages Philosophies If you don t need it, get rid of it. No ordinary users, and hence no passwords for them Run as few servers as possible Install conservative software, don t get the latest fancy servers, etc.) Log everything, and monitor the log files. Keep copious backups, including a Day 0 backup. Ordinary machines cannot be run that way. 7 / 17
8 Advantages Intro to s What s a Why Use s? Traditional s Advantages Philosophies Can operate at various levels in the stack Link, network, application Examines packet headers of the appropriate layer Transparent vs. proxy Stateful vs. stateless 8 / 17
9 Intro to s What s a Why Use s? Traditional s Advantages Philosophies Inside Filter Gateway(s) DMZ Filter Outside 9 / 17
10 Intro to s What s a Why Use s? Traditional s Advantages Philosophies An inside everyone on the inside is presumed to be a good guy An outside bad guys live there A DMZ (Demilitarized Zone) put necessary but potentially dangerous servers there 10 / 17
11 Intro to s What s a Why Use s? Traditional s Advantages Philosophies Good spot for things like mail and web servers Outsiders can send , retrieve web pages Insiders can retrieve , update web pages Must monitor such machines very carefully! 11 / 17
12 Intro to s What s a Why Use s? Traditional s Advantages Philosophies s protect administrative divisions. 12 / 17
13 Intro to s What s a Why Use s? Traditional s Advantages Philosophies s enforce policy Policy follows administrative boundaries, not physical ones Example: separate protection domains for Legal, HR, Research, etc. 13 / 17
14 Intro to s What s a Why Use s? Traditional s Advantages Philosophies 14 / 17
15 Philosophies Intro to s What s a Why Use s? Traditional s Advantages Philosophies 1. Block all dangerous destinations. 2. Block everything; unblock things known to be both safe and necessary. Option 1 gets you into an arms race with the attackers; you have to know everything that is dangerous, in all parts of your network. Option 2 is much safer. 15 / 17
16 Intro to s What s a Why Use s? Traditional s Advantages Philosophies Many sites permit arbitrary outbound traffic, but... Internal bad guys? Extrusion detection? Regulatory requirements? Other corporate policy? 16 / 17
17 Intro to s What s a Why Use s? Traditional s Advantages Philosophies Read the Readings list posted online Ask questions Are firewalls a full-proof solution? 17 / 17
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