56 lines
2.1 KiB
Plaintext
56 lines
2.1 KiB
Plaintext
########
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*filter
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########
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:INPUT {{ 'DROP' if common__iptables__drop_by_default else 'ACCEPT' }} [0:0]
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:FORWARD DROP [0:0]
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:OUTPUT {{ 'DROP' if common__iptables__drop_by_default else 'ACCEPT' }} [0:0]
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# Remove all rules from all chains,
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# delete all user-defined chains.
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-F
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-X
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# Allow all loopback (lo) traffic and reject anything
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# to localhost that does not originate from lo.
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-A INPUT -i lo -j ACCEPT
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-A INPUT ! -i lo -s ::/128 -j REJECT
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-A OUTPUT -o lo -j ACCEPT
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# Allow all outgoing traffic.
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-A OUTPUT -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
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-A INPUT -m conntrack --ctstate ESTABLISHED -j ACCEPT
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# Allow some important ICMP.
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-A INPUT -p icmpv6 --icmpv6-type echo-request -j ACCEPT
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-A OUTPUT -p icmpv6 --icmpv6-type echo-request -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type echo-reply -j ACCEPT
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-A OUTPUT -p icmpv6 --icmpv6-type echo-reply -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type packet-too-big -j ACCEPT
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-A OUTPUT -p icmpv6 --icmpv6-type packet-too-big -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type time-exceeded -j ACCEPT
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-A OUTPUT -p icmpv6 --icmpv6-type time-exceeded -j ACCEPT
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# TODO: maybe it's better to only allow these inside private network?
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-A INPUT -p icmpv6 --icmpv6-type router-solicitation -j ACCEPT
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-A OUTPUT -p icmpv6 --icmpv6-type router-solicitation -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type router-advertisement -j ACCEPT
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-A OUTPUT -p icmpv6 --icmpv6-type router-advertisement -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type neighbour-solicitation -j ACCEPT
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-A OUTPUT -p icmpv6 --icmpv6-type neighbour-solicitation -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type neighbour-advertisement -j ACCEPT
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-A OUTPUT -p icmpv6 --icmpv6-type neighbour-advertisement -j ACCEPT
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-A INPUT -p icmpv6 --icmpv6-type redirect -j ACCEPT
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-A OUTPUT -p icmpv6 --icmpv6-type redirect -j ACCEPT
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# Deny other ICMPv6.
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-A INPUT -p icmpv6 -j DROP
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-A OUTPUT -p icmpv6 -j DROP
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# Allow incoming SSH.
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-A INPUT -p tcp --dport 22 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
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-A OUTPUT -p tcp --sport 22 -m conntrack --ctstate ESTABLISHED -j ACCEPT
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{{ common__iptables__v6_filter }}
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COMMIT
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