1 files changed, 95 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/networking/knot.nix b/nixpkgs/nixos/modules/services/networking/knot.nix
new file mode 100644
index 000000000000..1cc1dd3f2f62
--- /dev/null
+++ b/nixpkgs/nixos/modules/services/networking/knot.nix
@@ -0,0 +1,95 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.knot;
+
+  configFile = pkgs.writeText "knot.conf" cfg.extraConfig;
+  socketFile = "/run/knot/knot.sock";
+
+  knotConfCheck = file: pkgs.runCommand "knot-config-checked"
+    { buildInputs = [ cfg.package ]; } ''
+    ln -s ${configFile} $out
+    knotc --config=${configFile} conf-check
+  '';
+
+  knot-cli-wrappers = pkgs.stdenv.mkDerivation {
+    name = "knot-cli-wrappers";
+    buildInputs = [ pkgs.makeWrapper ];
+    buildCommand = ''
+      mkdir -p $out/bin
+      makeWrapper ${cfg.package}/bin/knotc "$out/bin/knotc" \
+        --add-flags "--config=${configFile}" \
+        --add-flags "--socket=${socketFile}"
+      makeWrapper ${cfg.package}/bin/keymgr "$out/bin/keymgr" \
+        --add-flags "--config=${configFile}"
+      for executable in kdig khost kjournalprint knsec3hash knsupdate kzonecheck
+      do
+        ln -s "${cfg.package}/bin/$executable" "$out/bin/$executable"
+      done
+      mkdir -p "$out/share"
+      ln -s '${cfg.package}/share/man' "$out/share/"
+    '';
+  };
+in {
+  options = {
+    services.knot = {
+      enable = mkEnableOption "Knot authoritative-only DNS server";
+
+      extraArgs = mkOption {
+        type = types.listOf types.str;
+        default = [];
+        description = ''
+          List of additional command line paramters for knotd
+        '';
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = ''
+          Extra lines to be added verbatim to knot.conf
+        '';
+      };
+
+      package = mkOption {
+        type = types.package;
+        default = pkgs.knot-dns;
+        description = ''
+          Which Knot DNS package to use
+        '';
+      };
+    };
+  };
+
+  config = mkIf config.services.knot.enable {
+    systemd.services.knot = {
+      unitConfig.Documentation = "man:knotd(8) man:knot.conf(5) man:knotc(8) https://www.knot-dns.cz/docs/${cfg.package.version}/html/";
+      description = cfg.package.meta.description;
+      wantedBy = [ "multi-user.target" ];
+      wants = [ "network.target" ];
+      after = ["network.target" ];
+
+      serviceConfig = {
+        Type = "notify";
+        ExecStart = "${cfg.package}/bin/knotd --config=${knotConfCheck configFile} --socket=${socketFile} ${concatStringsSep " " cfg.extraArgs}";
+        ExecReload = "${knot-cli-wrappers}/bin/knotc reload";
+        CapabilityBoundingSet = "CAP_NET_BIND_SERVICE CAP_SETPCAP";
+        AmbientCapabilities = "CAP_NET_BIND_SERVICE CAP_SETPCAP";
+        NoNewPrivileges = true;
+        DynamicUser = "yes";
+        RuntimeDirectory = "knot";
+        StateDirectory = "knot";
+        StateDirectoryMode = "0700";
+        PrivateDevices = true;
+        RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6";
+        SystemCallArchitectures = "native";
+        Restart = "on-abort";
+      };
+    };
+
+    environment.systemPackages = [ knot-cli-wrappers ];
+  };
+}
+