2022-12-17

1 files changed, 32 insertions, 0 deletions

diff --git a/modules/nixos/fail2ban.nix b/modules/nixos/fail2ban.nix
new file mode 100644
index 0000000..5ac3c9c
--- /dev/null
+++ b/modules/nixos/fail2ban.nix
@@ -0,0 +1,32 @@
+{
+  config,
+  lib,
+  this,
+  ...
+}:
+with lib; let
+  cfg = config.nixfiles.modules.fail2ban;
+in {
+  options.nixfiles.modules.fail2ban.enable =
+    mkEnableOption "fail2ban";
+
+  config = mkIf cfg.enable {
+    services.fail2ban = {
+      enable = true;
+
+      bantime-increment = {
+        enable = true;
+        maxtime = "24h";
+        rndtime = "8m";
+      };
+
+      ignoreIP =
+        optionals (hasAttr "wireguard" this)
+        (with config.nixfiles.modules.wireguard; [ipv4.subnet ipv6.subnet]);
+
+      jails.DEFAULT = ''
+        blocktype = DROP
+      '';
+    };
+  };
+}