76 lines
2.6 KiB
Nix
76 lines
2.6 KiB
Nix
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{ config, pkgs, ... }:
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{
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#
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# iptables
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#
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networking.firewall.enable = false;
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system.activationScripts.iptables =
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let
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log = false;
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when = c: f: if c then f else "";
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in
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''
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ip4tables() { ${pkgs.iptables}/sbin/iptables "$@"; }
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ip6tables() { ${pkgs.iptables}/sbin/ip6tables "$@"; }
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ipXtables() { ip4tables "$@" && ip6tables "$@"; }
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# XXX This fails with the original CAC CentOS 7 kernel.
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if ipXtables -vL >/dev/null; then
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#
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# nat
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#
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# reset tables
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ipXtables -t nat -F
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ipXtables -t nat -X
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#
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ipXtables -t nat -A PREROUTING -j REDIRECT ! -i retiolum -p tcp --dport ssh --to-ports 0
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ipXtables -t nat -A PREROUTING -j REDIRECT -p tcp --dport 11423 --to-ports ssh
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#
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# filter
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#
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# reset tables
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ipXtables -P INPUT DROP
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ipXtables -P FORWARD DROP
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ipXtables -F
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ipXtables -X
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# create custom chains
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ipXtables -N Retiolum
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# INPUT
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ipXtables -A INPUT -j ACCEPT -m conntrack --ctstate RELATED,ESTABLISHED
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ipXtables -A INPUT -j ACCEPT -i lo
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ipXtables -A INPUT -j ACCEPT -p tcp --dport ssh -m conntrack --ctstate NEW
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#ipXtables -A INPUT -j ACCEPT -p tcp --dport http -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport tinc -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport smtp -m conntrack --ctstate NEW
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#ipXtables -A INPUT -j ACCEPT -p tcp --dport xmpp-client -m conntrack --ctstate NEW
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#ipXtables -A INPUT -j ACCEPT -p tcp --dport xmpp-server -m conntrack --ctstate NEW
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ipXtables -A INPUT -j Retiolum -i retiolum
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${when log "ipXtables -A INPUT -j LOG --log-level info --log-prefix 'INPUT DROP '"}
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# FORWARD
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${when log "ipXtables -A FORWARD -j LOG --log-level info --log-prefix 'FORWARD DROP '"}
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# Retiolum
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ip4tables -A Retiolum -j ACCEPT -p icmp --icmp-type echo-request
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ip6tables -A Retiolum -j ACCEPT -p ipv6-icmp -m icmp6 --icmpv6-type echo-request
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${when log "ipXtables -A Retiolum -j LOG --log-level info --log-prefix 'REJECT '"}
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ipXtables -A Retiolum -j REJECT -p tcp --reject-with tcp-reset
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ip4tables -A Retiolum -j REJECT -p udp --reject-with icmp-port-unreachable
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ip4tables -A Retiolum -j REJECT --reject-with icmp-proto-unreachable
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ip6tables -A Retiolum -j REJECT -p udp --reject-with icmp6-port-unreachable
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ip6tables -A Retiolum -j REJECT
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fi
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'';
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}
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