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https://github.com/nmasur/dotfiles
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78 lines
2.5 KiB
Nix
78 lines
2.5 KiB
Nix
{ config, lib, pkgs, ... }:
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# Currently has some issues that don't make this viable.
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# Taken from:
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# https://dataswamp.org/~solene/2022-09-29-iblock-implemented-in-nixos.html
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# You will need to flush all rules when removing:
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# https://serverfault.com/questions/200635/best-way-to-clear-all-iptables-rules
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let
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portsToBlock = [ 25545 25565 25570 ];
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portsString =
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builtins.concatStringsSep "," (builtins.map builtins.toString portsToBlock);
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# Block IPs for 20 days
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expire = 60 * 60 * 24 * 20;
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rules = table: [
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"INPUT -i eth0 -p tcp -m multiport --dports ${portsString} -m state --state NEW -m recent --set"
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"INPUT -i eth0 -p tcp -m multiport --dports ${portsString} -m state --state NEW -m recent --update --seconds 10 --hitcount 1 -j SET --add-set ${table} src"
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"INPUT -i eth0 -p tcp -m set --match-set ${table} src -j nixos-fw-refuse"
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"INPUT -i eth0 -p udp -m set --match-set ${table} src -j nixos-fw-refuse"
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];
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create-rules = lib.concatStringsSep "\n"
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(builtins.map (rule: "iptables -C " + rule + " || iptables -A " + rule)
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(rules "blocked") ++ builtins.map
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(rule: "ip6tables -C " + rule + " || ip6tables -A " + rule)
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(rules "blocked6"));
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delete-rules = lib.concatStringsSep "\n"
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(builtins.map (rule: "iptables -C " + rule + " && iptables -D " + rule)
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(rules "blocked") ++ builtins.map
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(rule: "ip6tables -C " + rule + " && ip6tables -D " + rule)
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(rules "blocked6"));
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in {
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options.honeypot.enable = lib.mkEnableOption "Honeypot fail2ban system.";
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config.networking.firewall = lib.mkIf config.honeypot.enable {
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extraPackages = [ pkgs.ipset ];
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# allowedTCPPorts = portsToBlock;
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# Restore ban list when starting up
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extraCommands = ''
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if test -f /var/lib/ipset.conf
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then
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ipset restore -! < /var/lib/ipset.conf
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else
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ipset -exist create blocked hash:ip ${
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if expire > 0 then "timeout ${toString expire}" else ""
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}
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ipset -exist create blocked6 hash:ip family inet6 ${
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if expire > 0 then "timeout ${toString expire}" else ""
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}
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fi
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${create-rules}
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'';
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# Save list when shutting down
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extraStopCommands = ''
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ipset -exist create blocked hash:ip ${
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if expire > 0 then "timeout ${toString expire}" else ""
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}
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ipset -exist create blocked6 hash:ip family inet6 ${
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if expire > 0 then "timeout ${toString expire}" else ""
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}
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ipset save > /var/lib/ipset.conf
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${delete-rules}
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'';
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};
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}
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