99 lines
3 KiB
Nix
99 lines
3 KiB
Nix
{lib, pkgs, config, ...}: {
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# using https://github.com/greaka/ops/blob/818be4c4dea9129abe0f086d738df4cb0bb38288/apps/restic/options.nix as a base
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options = {
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skynet_firewall = {
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enable = lib.mkEnableOption {
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default = false;
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example = true;
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description = "Skynet Firewall";
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type = lib.types.bool;
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};
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forward = lib.mkOption {
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default = [ ];
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type = lib.types.listOf lib.types.str;
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description = ''
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A list of routes to forward
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'';
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};
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};
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};
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config = lib.mkIf config.skynet_firewall.enable {
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# disable default firewall to enable nftables
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networking.firewall.enable = false;
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networking.nftables.enable = true;
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# fules for the firewall
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# beware of EOL conversion.
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networking.nftables.ruleset =
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''
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# Check out https://wiki.nftables.org/ for better documentation.
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# Table for both IPv4 and IPv6.
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table ip nat {
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chain prerouting {
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type nat hook prerouting priority dstnat; policy accept;
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# forward anything with port 2222 to this specific ip
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# tcp dport 2222 counter packets 0 bytes 0 dnat to 193.1.99.76:22
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# forward http/s traffic from 76 to 123
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# ip daddr 193.1.99.76 tcp dport 80 counter packets 0 bytes 0 dnat to 193.1.99.123:80
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# ip daddr 193.1.99.76 tcp dport 443 counter packets 0 bytes 0 dnat to 193.1.99.123:443
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}
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chain postrouting {
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type nat hook postrouting priority srcnat; policy accept;
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# the internal network
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ip saddr 172.20.20.0/23 counter packets 0 bytes 0 masquerade
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}
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chain output {
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type nat hook output priority -100; policy accept;
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}
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}
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table ip filter {
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chain input {
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type filter hook input priority filter; policy accept;
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tcp dport 22 counter packets 0 bytes 0 jump fail2ban-ssh
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tcp dport 22 counter packets 0 bytes 0 accept
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}
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chain forward {
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type filter hook forward priority filter; policy drop;
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counter packets 0 bytes 0 jump rejects
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# accept these ip/ports
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# ip saddr 193.1.99.123 tcp dport 443 counter packets 0 bytes 0 accept
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# can basically make each machiene responsibile for their own forwarding (in config at least)
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${lib.strings.concatMapStrings (x: x + "\n") config.skynet_firewall.forward}
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counter packets 0 bytes 0 reject with icmp type admin-prohibited
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}
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chain output {
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type filter hook output priority filter; policy accept;
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# no outgoing limits (for now)
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}
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chain fail2ban-ssh {
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# ban these
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# ip saddr 104.236.151.120 counter packets 0 bytes 0 drop
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counter packets 0 bytes 0 return
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}
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chain rejects {
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# Reject all these
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# ip saddr 220.119.33.251 counter packets 0 bytes 0 reject with icmp type admin-prohibited
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}
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}
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'';
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};
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}
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