fix: move filter into jail settings (NixOS submodule doesn't pass string filters)

AGENTS.md

@@ -5,6 +5,7 @@ This document outlines the development conventions for this NixOS-based infrastr
 ## Build & Deployment
 
 - **Build/Deploy:** Use `nixos-rebuild switch --flake .#<hostname>` to build and deploy the configuration for a specific host.
+- **CRITICAL — Validate before pushing:** Always `nix build --no-link '.#nixosConfigurations.<hostname>.config.system.build.toplevel'` (or `nh os build`) and confirm it succeeds before pushing any changes. Never push untested NixOS configs.
 - **Development Shell:** Activate the development environment with `nix develop`.
 
 ## Linting & Formatting

hosts/lazyworkhorse/configuration.nix

@@ -314,9 +314,9 @@
   
   # Firewall - default deny, explicit allow
   networking.firewall = {
+    # Enable firewall with default deny policy (NixOS firewall denies all by default)
     enable = true;
     allowPing = true;
-    defaultAllow = false;
     
     # Only essential ports exposed to internet
     allowedTCPPorts = [
@@ -356,54 +356,74 @@
   # Fail2ban - automatic IP banning
   services.fail2ban = {
     enable = true;
-    maxRetry = 3;
+    maxretry = 3;
-    findtime = 600;
+    bantime = "1h";
-    bantime = 3600;
     banaction = "iptables-multiport";
     
-    # Ban repeat offenders for 1 week
-    recidive = {
-      enabled = true;
-      filter = "recidive";
-      logpath = "/var/log/fail2ban.log";
-      bantime = 604800;
-      findtime = 86400;
-      maxretry = 3;
-    };
-    
     jails = {
-      # SSH brute force protection
+      # SSH brute force protection (uses systemd journal backend)
       sshd = {
         enabled = true;
-        filter = "sshd";
+        settings = {
-        port = "2424";
+          filter = "sshd";
-        logpath = "/var/log/auth.log";
+          port = "2424";
-        maxretry = 3;
+          maxretry = 3;
-        bantime = 3600;
+          bantime = "1h";
+        };
       };
       
-      # HTTP authentication failures
+      # Recidive - ban repeat offenders for 1 week
+      recidive = {
+        enabled = true;
+        settings = {
+          filter = "recidive";
+          logpath = "/var/log/fail2ban.log";
+          bantime = "1w";
+          findtime = "1d";
+          maxretry = 3;
+        };
+      };
+      
+      # HTTP authentication failures (Traefik)
       http-auth = {
         enabled = true;
-        filter = "apache-auth";
+        settings = {
-        port = "80,443";
+          filter = "traefik-auth";
-        logpath = "/var/log/traefik/access.log";
+          port = "80,443";
-        maxretry = 5;
+          logpath = "/var/log/traefik/access.log";
-        bantime = 3600;
+          maxretry = 5;
+          bantime = "1h";
+        };
       };
       
-      # HTTP scanning/attacks
+      # HTTP scanning/attacks (Traefik)
       http-botsearch = {
         enabled = true;
-        filter = "apache-botsearch";
+        settings = {
-        port = "80,443";
+          filter = "traefik-botsearch";
-        logpath = [ "/var/log/traefik/access.log" ];
+          port = "80,443";
-        maxretry = 2;
+          logpath = "/var/log/traefik/access.log";
-        bantime = 7200;
+          maxretry = 2;
+          bantime = "2h";
+        };
       };
     };
   };
   
+  # Custom fail2ban filters for Traefik
+  environment.etc."fail2ban/filter.d/traefik-auth.conf".text = ''
+    [Definition]
+    failregex = ^<HOST> -.*"(GET|POST|HEAD|PUT|DELETE).*" (401|403) \d+.*$
+    ignoreregex =
+  '';
+  
+  environment.etc."fail2ban/filter.d/traefik-botsearch.conf".text = ''
+    [Definition]
+    failregex = ^<HOST> -.*"(GET|POST|HEAD|PUT|DELETE).*" 404 \d+.*$
+                ^<HOST> -.*"(GET|POST|HEAD|PUT|DELETE).*/(\.|wp-|php|admin|login|xmlrpc|\.env|\.git|\.aws|\.azure).*" \d+.*$
+    ignoreregex =
+  '';
+
   # SSH hardening
   services.openssh.settings = {
     PermitRootLogin = "no";
@@ -470,7 +490,7 @@
   };
 
   # Audit logging
-  services.auditd.enable = true;
+  security.auditd.enable = true;
   
   # Fail2ban log directory
   systemd.tmpfiles.rules = [