diff --git a/modules/services/caddy.nix b/modules/services/caddy.nix
index fdcdbb8..0093a13 100644
--- a/modules/services/caddy.nix
+++ b/modules/services/caddy.nix
@@ -2,6 +2,12 @@
 
 {
   options = {
+    homelab.publicDomain= lib.mkOption {
+      type = lib.types.str;
+    };
+    homelab.authDomain = lib.mkOption {
+      type = lib.types.str;
+    };
     homelab.domain = lib.mkOption {
       type = lib.types.str;
     };
@@ -9,6 +15,9 @@
 
   config = {
     homelab.domain = "${config.networking.hostName}.astolfo.org";
+    homelab.publicDomain = "astolfo.org";
+    homelab.authDomain = lib.mkDefault "sso.${config.homelab.publicDomain}";
+
     networking.firewall.allowedTCPPorts = [ 80 443 ];
     
     services.caddy = {