crowdsec

modules/nixos/orac/crowdsec.nix

@@ -0,0 +1,68 @@
+{ config, pkgs, ... }:
+
+{
+  # 1. Enable the CrowdSec Security Engine
+  services.crowdsec = {
+    enable = true;
+
+    # Automated hub management
+    hub = {
+      collections = [
+        "crowdsecurity/linux"    # Base linux protection
+        "crowdsecurity/sshd"     # SSH brute force
+        "crowdsecurity/traefik"  # Traefik log parsing
+        "crowdsecurity/http-cve" # Generic HTTP attacks
+      ];
+    };
+
+    # 2. Configure log sources (Acquisitions)
+    localConfig.acquisitions = [
+      # Monitor SSH and System Auth via Systemd Journal
+      {
+        source = "journalctl";
+        journalctl_filter = [ "_SYSTEMD_UNIT=sshd.service" ];
+        labels.type = "syslog";
+      }
+      {
+        source = "journalctl";
+        journalctl_filter = [ "SYSLOG_IDENTIFIER=sudo" "SYSLOG_IDENTIFIER=auth" ];
+        labels.type = "syslog";
+      }
+
+      # Monitor Traefik logs from Docker via Journald
+      {
+        source = "journalctl";
+        journalctl_filter = [ "_SYSTEMD_UNIT=docker-traefik.service" ]; # Matches your Traefik service unit
+        labels.type = "traefik";
+      }
+    ];
+
+    # Required for the Local API (LAPI) to function
+    settings = {
+      api.server.enable = true;
+    };
+  };
+
+  # 3. Enable the Firewall Bouncer (Remediation)
+  services.crowdsec-firewall-bouncer = {
+    enable = true;
+    
+    # Automatically register the bouncer with the local CrowdSec engine
+    registerBouncer = true;
+
+    # Using the 'settings' attribute for fine-grained configuration
+    settings = {
+      mode = "nftables"; # Modern NixOS uses nftables by default
+      log_level = "info";
+      update_frequency = "10s";
+      
+      # The API URL for the local engine
+      api_url = "http://127.0.0.1:8080/";
+    };
+  };
+
+  # 4. Permissions: Ensure CrowdSec can read logs from systemd-journal
+  # The crowdsec service runs as its own user. It needs to be in the 'systemd-journal' group 
+  # to read journalctl logs.
+  users.users.crowdsec.extraGroups = [ "systemd-journal" ];
+}

nixos/orac.nix

@@ -9,6 +9,7 @@
     ../modules/nixos/orac/restic.nix
     ../modules/containers/docker/karakeep/docker-compose.nix
     ../modules/nixos/orac/monitoring.nix
+    ../modules/nixos/orac/crowdsec.nix
   ];
 
   networking.firewall = {