Hi,
I want to ask about FWaaS iptables rule implementation.
firewall rule are deployed as iptables rules in network node , and ACCEPT
target is set at second rule(*).
----
Chain neutron-l3-agent-iv431d7bfbc (1 references)
pkts bytes target prot opt in out source destination
0 0 DROP all -- * * 0.0.0.0/0 0.0.0.0/0
state INVALID
0 0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0
state RELATED,ESTABLISHED (*)
0 0 neutron-l3-agent-liA31d7bfbc tcp -- * * 172.16.2.0/23
1.2.3.4 tcp spts:1025:65535 dpt:80
0 0 neutron-l3-agent-liA31d7bfbc tcp -- * * 172.16.6.0/24
1.2.3.4 tcp spts:1025:65535 dpt:80
0 0 neutron-l3-agent-liA31d7bfbc tcp -- * * 1.2.3.4
172.16.14.0/24 tcp spts:1025:65535 dpt:11051
0 0 neutron-l3-agent-liA31d7bfbc tcp -- * * 10.3.0.0/24
1.2.3.4 tcp spts:1025:65535 dpt:22
0 0 neutron-l3-agent-liD31d7bfbc all -- * * 0.0.0.0/0
0.0.0.0/0
----
Why is ACCEPT rule set at second in iptables rule. Performance reason(ICMP or
other protocol such as UDP/TCP)?
This causes some wrong scenario for example...
[outside openstack cloud] ---> Firewall(FWaaS) --> [inside openstack cloud]
1) admin create Firewall and create Filrewall rule accepting ICMP request from
outside openstack cloud, and
2) ICMP request packets incoming from outside to inside, and
3) someday, admin detects that ICMP rule is security vulnerability and create
Firewall rule blocking ICMP request from outside.
but ICMP request packets still incoming due to ACCEPT rule(*), because ICMP
connection still hit rule at second(*).
Thanks.
kazuhiro MIYASHITA
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