Download Firewall Design and Analysis (Computer and Network Security) by Alex X. Liu PDF

By Alex X. Liu

This certain booklet represents the 1st rigorous and complete research of firewall coverage layout and research. Firewalls are the main severe and generally deployed intrusion prevention platforms. Designing new firewall guidelines and interpreting current firewall regulations were tricky and error-prone. This ebook provides scientifically sound and essentially worthwhile equipment for designing and studying firewall regulations. This publication comes in handy to a number of readers. First, it may be used as a instruction manual for network/firewall directors and community safeguard execs. moment, it may be used as a sophisticated textbook for graduate scholars and senior undergraduate scholars in desktop technology and engineering. 3rd, it's also compatible for non-experts in community defense who desire to comprehend extra approximately firewalls. The presentation of the booklet is distinctive sufficient to seize the curiosity of curious readers, and whole sufficient to supply the required history fabric had to delve additional into the topic of firewalls and community protection.

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January 13, 2010 36 14:41 World Scientific Book - 9in x 6in BookFirewallDesignAnalysis Firewall Design and Analysis Construction Algorithm Input : A firewall ???? of a sequence of rules ⟨????1 , ⋅ ⋅ ⋅ , ???????? ⟩ Output : An FDD ???? ′ such that ???? and ???? ′ are equivalent Steps: 1. build a decision path with root ???? from rule ????1 ; 2. for ???? := 2 to ???? do APPEND( ????, ???????? ); End APPEND( ????, (???????? ∈ ???????? ) ∧ ⋅ ⋅ ⋅ ∧ (???????? ∈ ???????? ) → ⟨decision⟩ ) /*???? (????) = ???????? and ????(????) = {????1 , ⋅ ⋅ ⋅ , ???????? }*/ 1. if ( ???????? − ( ????(????1 ) ∪ ⋅ ⋅ ⋅ ∪ ????(???????? ) ) ) ∕= ∅ then (a) add an outgoing edge ????????+1 with label ???????? − (????(????1 ) ∪ ⋅ ⋅ ⋅ ∪ ????(???????? )) to ????; (b) build a decision path from rule (????????+1 ∈ ????????+1 ) ∧ ⋅ ⋅ ⋅ ∧ (???????? ∈ ???????? ) → ⟨decision⟩, and make ????????+1 point to the first node in this path; 2.

1) ????1 ∈ [5, 8] ∧ ????2 ∈ [3, 4] → ????, (2) ????1 ∈ [5, 8] ∧ ????2 ∈ [6, 8] → ????, (3) ????1 ∈ [1, 10] ∧ ????2 ∈ [1, 10] → ????, Fig. 13 A simple firewall What we get from Algorithm 5 is a simple firewall. For each rule ????1 ∈ ????1 ∧⋅ ⋅ ⋅∧???????? ∈ ???????? ∧⋅ ⋅ ⋅∧???????? ∈ ???????? → ⟨????????????????????????????????⟩, ???????? is an interval of nonnegative integers. 0 in a binary format. In this chapter we stop the level of discussion at simple rules because an integer interval can be converted to multiple prefixes algorithmically. For example, integer interval [2, 8] can be converted to 3 prefixes: 001∗, 01∗, 1000.

Second, because there is no specification model for stateful firewalls, in existing stateful firewall products, state tracking functionalities have been hard coded and different vendors hard code different state tracking functionalities. For example, the Cisco PIX Firewalls do not track the state for ICMP packets. Consequently, it is hard for the administrator of such a firewall to track the Ping [Postel (1981)] protocol. Last, without a specification model, it is difficult to analyze the properties of stateful firewalls.

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