myputer specific changes

homes/modules/server/fail2ban.nix

@@ -0,0 +1,17 @@
+{...}: {
+  # simple fail2ban config (not production ready or anything though)
+  # refer to: https://nixos.wiki/wiki/Fail2Ban
+  services.fail2ban = {
+    enable = true;
+
+    maxretry = 5;
+    bantime = "10m"; # 10 minute ban
+    bantime-increment = {
+      enable = true;
+      formula = "ban.Time * math.exp(float(ban.Count+1)*banFactor)/math.exp(1*banFactor)";
+      multipliers = "1 2 4 8 16 32 64";
+      maxtime = "168h"; # dont ban for more than 1 week
+      overalljails = true;
+    };
+  };
+}