feat(dns): setup dns over tls module

1 files changed, 60 insertions, 0 deletions

diff --git a/modules/hosts/dns/default.nix b/modules/hosts/dns/default.nix
new file mode 100644
index 0000000..8463367
--- /dev/null
+++ b/modules/hosts/dns/default.nix
@@ -0,0 +1,60 @@
+{
+  config,
+  lib,
+  ...
+}:
+
+let
+  inherit (lib) mkOption types mkIf;
+  cfg = config.nx.dns;
+in
+{
+  options.nx.dns = {
+    enable = mkOption {
+      description = "enable DNS-over-TLS using systemd-resolved";
+      type = types.bool;
+      default = false;
+    };
+    servers = mkOption {
+      description = "list of DNS-over-TLS servers to use";
+      type = types.listOf types.str;
+      default = [
+        "1.1.1.1#cloudflare-dns.com"
+        "1.0.0.1#cloudflare-dns.com"
+        "9.9.9.9#dns.quad9.net"
+        "149.112.112.112#dns.quad9.net"
+      ];
+    };
+    fallbackServers = mkOption {
+      description = "fallback DNS servers";
+      type = types.listOf types.str;
+      default = [
+        "8.8.8.8#dns.google"
+        "8.8.4.4#dns.google"
+      ];
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.resolved = {
+      enable = true;
+      dnssec = "true";
+      dnsovertls = "true";
+      domains = [ "~." ];
+      extraConfig = ''
+        DNSStubListener=yes
+        Cache=yes
+      '';
+    };
+
+    networking = {
+      nameservers = cfg.servers;
+      networkmanager.dns = lib.mkDefault "systemd-resolved";
+    };
+
+    systemd.services.systemd-resolved.environment = {
+      DNS = lib.concatStringsSep " " cfg.servers;
+      FallbackDNS = lib.concatStringsSep " " cfg.fallbackServers;
+    };
+  };
+}