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https://github.com/nmasur/dotfiles
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82 lines
2.5 KiB
Nix
82 lines
2.5 KiB
Nix
# This is a tool for blocking IPs of anyone who attempts to scan all of my
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# ports.
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# Currently has some issues that don't make this viable.
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{
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config,
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lib,
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pkgs,
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...
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}:
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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 = [
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25545
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25565
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25570
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];
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portsString = 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) (rules "blocked")
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++ builtins.map (rule: "ip6tables -C " + rule + " || ip6tables -A " + rule) (rules "blocked6")
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);
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delete-rules = lib.concatStringsSep "\n" (
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builtins.map (rule: "iptables -C " + rule + " && iptables -D " + rule) (rules "blocked")
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++ builtins.map (rule: "ip6tables -C " + rule + " && ip6tables -D " + rule) (rules "blocked6")
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);
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in
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{
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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 ${if expire > 0 then "timeout ${toString expire}" else ""}
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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 ${if expire > 0 then "timeout ${toString expire}" else ""}
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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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