ip6tables testing ip6tables Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 1 von 12
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1 testing ip6tables Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 1 von 12
2 ip6tables Setup Abbildung : Network Setup Linux grml grml-amd64 Debian grml.1 x86_64 ip6tables ft6 SVN-Revision Python Scapy Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 2 von 12
3 ip6tables Results Test Basic Rules Advanced Rules ICMPv6 Filtering Routing Header Header Chain 1 Overlapping Fragments Tiny IPv6 Fragments A Tiny IPv6 Fragments B Excessive HBH Options 1 PadN Covert Channel Address Scope 1 not very elegant Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 3 von 12
4 ip6tables Results Test Basic Rules Advanced Rules ICMPv6 Filtering Routing Header Header Chain 1 Overlapping Fragments Tiny IPv6 Fragments A Tiny IPv6 Fragments B Excessive HBH Options 1 PadN Covert Channel Address Scope 1 not very elegant Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 4 von 12
5 ip6tables Configuration ip6tables -A FORWARD -p tcp --dport 80 -j ACCEPT ip6tables -A FORWARD -p udp --dport 80 -j ACCEPT ip6tables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT ip6tables -P FORWARD DROP Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 5 von 12
6 ip6tables Routing Header Check whether the firewall correctly forwards or discards packets containing a routing header. default config Type = 0, segments-left = 0: forwarded Type = 0, segments-left 0: forwarded Type = 2, segments-left 1: forwarded!! Type = 2, segments-left = 1: forwarded!! Type = 200, segments-left = 0: forwarded Type = 200, segments-left 0: forwarded Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 6 von 12
7 ip6tables Routing Header Problem: Packets are targeted at port 80, ip6tables doesn t check for routing headers by default. Solution: Use the rt module. But not like this: ip6tables -A FORWARD -m rt --rt-type 0 -j ACCEPT ip6tables would accept all packets with routing headers without checking the port! Rather: inspect routing headers in a separate chain. Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 7 von 12
8 ip6tables Routing Header advanced configuration: ip6tables -N routinghdr ip6tables -A routinghdr -m rt --rt-type 0! --rt-segsleft 0 -j DROP ip6tables -A routinghdr -m rt --rt-type 2! --rt-segsleft 1 -j DROP ip6tables -A routinghdr -m rt --rt-type 0 --rt-segsleft 0 -j RETURN ip6tables -A routinghdr -m rt --rt-type 2 --rt-segsleft 1 -j RETURN ip6tables -A routinghdr -m rt! --rt-segsleft 0 --j DROP ip6tables -A FORWARD -m ipv6header --header ipv6-route --soft \ -j routinghdr Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 8 von 12
9 ip6tables Routing Header advanced config Type = 0, segments-left = 0: forwarded Type = 0, segments-left 0: dropped Type = 2, segments-left 1: dropped!! Type = 2, segments-left = 1: forwarded!! Type = 200, segments-left = 0: forwarded Type = 200, segments-left 0: dropped Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 9 von 12
10 ip6tables Extension Header Chain Check whether the firewall correctly filters packets based on number and order of header chains present. default config HBH: dropped HBH-HBH: dropped HBH-DSTOPT-RH-HBH: dropped DSTOPT: forwarded DSTOPT-HBH: forwarded DSTOPT-DSTOPT: forwarded DSTOPT-RH-DSTOPT: forwarded Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 10 von 12
11 ip6tables Extension Header Chain Problem: Packets are targeted at port 80, ip6tables doesn t check for extension headers by default. Solution: Use modules ipv6header or ipv6headerorder and check for extension headers in separate chain. But: you would have to enumerate all possible combinations and write one rule for each of them. This wasn t performed in our test. We tested the modules for basic functionality though. So, no advanced config. Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 11 von 12
12 ip6tables Results Test Basic Rules Advanced Rules ICMPv6 Filtering Routing Header Header Chain 1 Overlapping Fragments Tiny IPv6 Fragments A (dropped) Tiny IPv6 Fragments B (dropped) Excessive HBH Options (see header chain) 1 PadN Covert Channel Address Scope 1 not very elegant Oliver Eggert (Universität Potsdam) ft6: firewall tester for IPv6 Folie 12 von 12
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