diff --git a/nixos/common.nix b/nixos/common.nix
index b4ae10c..e4fd557 100644
--- a/nixos/common.nix
+++ b/nixos/common.nix
@@ -103,7 +103,13 @@ in
   services = {
     openssh = {
       enable = true;
-      settings.ClientAliveInterval = 300;
+
+      settings = {
+        ClientAliveInterval = 300;
+        KbdInteractiveAuthentication = false;
+        PasswordAuthentication = false;
+        PermitRootLogin = "no";
+      };
     };
   };