diff --git a/configuration.nix b/configuration.nix
index 11706bd..ac975fc 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -11,5 +11,18 @@
   programs.mosh.enable = true;
   boot.zfs.extraPools = ["bold"];
   boot.supportedFilesystems = ["zfs"];
+  boot.kernel.sysctl."kernel.sysrq" = 1;
+
+  services.openssh.enable = true;
+  networking.firewall.rejectPackets = true;
+
+  users.users = {
+    root.openssh.authorizedKeys.keyFiles = [ ./linus.pub ];
+    linus = {
+      isNormalUser = true;
+      extraGroups = ["wheel"];
+      openssh.authorizedKeys.keyFiles = [ ./linus.pub ];
+    };
+  };
   system.stateVersion = "20.09";
 }