91 lines
2.2 KiB
Nix
91 lines
2.2 KiB
Nix
{
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lib,
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pkgs,
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config,
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...
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}:
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let
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inherit (lib) mkOption types concatStringsSep;
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cfg = config.systemConf.security;
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in
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{
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options.systemConf.security = {
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allowedDomains = mkOption {
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type = with types; listOf str;
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description = "Domains that allowed to query dns.";
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default = [ ];
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};
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rules = {
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setName = mkOption {
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type = with types; str;
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default = "allowed_output_ips";
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readOnly = true;
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};
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setNameV6 = mkOption {
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type = with types; str;
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default = "allowed_output_ipv6";
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readOnly = true;
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};
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};
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dnsIPs = mkOption {
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type = with types; listOf str;
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description = "External DNS server to use";
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default = [ "8.8.8.8" ];
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};
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allowedIPs = mkOption {
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type = with types; listOf str;
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description = "IPv4 that allowed to request.";
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default = [ ];
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};
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allowedIPv6 = mkOption {
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type = with types; listOf str;
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description = "IPv6 that allowed to request.";
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default = [ ];
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};
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sourceIPs = mkOption {
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type = with types; listOf str;
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description = "Source IPs to restrict.";
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default = [ ];
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};
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};
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config = {
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environment.systemPackages = with pkgs; [
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ipset
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];
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systemd.timers.fetch-allowed-domains = {
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnBootSec = 10;
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OnUnitActiveSec = 360;
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};
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};
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systemd.services.fetch-allowed-domains = {
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path = with pkgs; [
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nftables
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dig.dnsutils
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];
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after = [ "network.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.writeShellScript "fetch-allowed-domains" ''
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DOMAINS=(${toString (map (x: ''"${x}"'') cfg.allowedDomains)})
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SETNAME="inet filter ${cfg.rules.setName}"
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nft flush set $SETNAME
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nft add element $SETNAME { ${concatStringsSep "," cfg.allowedIPs} }
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for domain in "''${DOMAINS[@]}"; do
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ips=$(dig +short A $domain | grep -E '^[0-9.]+$')
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for ip in $ips; do
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nft add element $SETNAME { $ip }
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echo "Added $ip for $domain"
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done
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done
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''}";
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Type = "oneshot";
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};
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};
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};
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}
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