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IPSec and Firewalls Section 8.6.1, 8.6.2. IPSec Internet Protocol Security –RFC 2401 (4301) –security in the network layer –authentication –secrecy –what.

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Presentation on theme: "IPSec and Firewalls Section 8.6.1, 8.6.2. IPSec Internet Protocol Security –RFC 2401 (4301) –security in the network layer –authentication –secrecy –what."— Presentation transcript:

1 IPSec and Firewalls Section 8.6.1, 8.6.2

2 IPSec Internet Protocol Security –RFC 2401 (4301) –security in the network layer –authentication –secrecy –what is the difference? –build a Security Association between two computers a shared key is setup Internet Key Exchange RFC 4306 (version 2)

3 http://www.xml-dev.com/xml/images/DiffieHellman.png

4 Authentication Header Tanenbaum, p 774, Figure 8-27 When might this cause problems? What does this guarantee?

5 Encapsulating Security Payload Header Tanenbaum, p 775, Figure 8-28

6 Encapsulating Security Payload Header Tanenbaum, p 775, Figure 8-28

7 Firewall/Packet Filter Inspect each packet in the kernel Filter before giving to an application Linux – netfilter/iptables –http://netfilter.org/ –ipchains is obsolete FreeBSD & Max OSX – ipfw –http://www.freebsd-howto.com/HOWTO/Ipfw-HOWTO Windows – built in firewall –many commercial products

8 iptables # Allow HTTP iptables -A tcp_inbound -p TCP -s 0/0 --destination-port 80 -j ACCEPT # Allow HTTP from zeus.cs.pacificu.edu iptables -A tcp_inbound -p TCP -s zeus.cs.pacificu.edu --destination-port 80 -j ACCEPT # DisAllow HTTP iptables -A tcp_inbound -p TCP -s 0/0 --destination-port 80 -j DENY

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