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junjuew/docker-firewall.sh

Last active August 19, 2019 05:12
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Set up firewalls for docker container to allow internal/CMU IPs only
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docker-firewall.sh
# in Docker >v17, DOCKER-USER chain is introduced. It is a
# iptable chain in FILTER table, called before DOCKER chain.
# By default, it accepts all connections.
# delete default return rule
sudo iptables -D DOCKER-USER -j RETURN
# allow default container and private subnet
sudo iptables -C DOCKER-USER -s 172.16.0.0/12 -j ACCEPT || sudo iptables -I DOCKER-USER 1 -s 172.16.0.0/12 -j ACCEPT
sudo iptables -C DOCKER-USER -s 192.168.0.0/16 -j ACCEPT || sudo iptables -I DOCKER-USER 1 -s 192.168.0.0/16 -j ACCEPT
sudo iptables -C DOCKER-USER -s 10.0.0.0/8 -j ACCEPT || sudo iptables -I DOCKER-USER 1 -s 10.0.0.0/8 -j ACCEPT
# allow CMU ips
sudo iptables -C DOCKER-USER -s 128.2.0.0/16 -j ACCEPT || sudo iptables -I DOCKER-USER 1 -s 128.2.0.0/16 -j ACCEPT
sudo iptables -C DOCKER-USER -s 128.237.0.0/16 -j ACCEPT || sudo iptables -I DOCKER-USER 1 -s 128.237.0.0/16 -j ACCEPT
# allow established connections
sudo iptables -C DOCKER-USER -m state --state ESTABLISHED,RELATED -j ACCEPT || sudo iptables -A DOCKER-USER -m state --state ESTABLISHED,RELATED -j ACCEPT
# reject all other ips
sudo iptables -C DOCKER-USER -j DROP || sudo iptables -A DOCKER-USER -j DROP
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