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 transcript:

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 is the difference? –build a Security Association between two computers a shared key is setup Internet Key Exchange RFC 4306 (version 2)

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

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

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

Firewall/Packet Filter Inspect each packet in the kernel Filter before giving to an application Linux – netfilter/iptables – –ipchains is obsolete FreeBSD & Max OSX – ipfw – Windows – built in firewall –many commercial products

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