Install and configure crowdsec on cirrus

flake.lock

@@ -16,6 +16,27 @@
         "type": "github"
       }
     },
+    "crowdsec": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1742920128,
+        "narHash": "sha256-VPjnjtAksihLezhc+ZmnqGu18mHr4QVKa1kSZQ8rJL4=",
+        "ref": "refs/heads/main",
+        "rev": "40e937689d318ee85b1d9763189a65e6f0b4028d",
+        "revCount": 40,
+        "type": "git",
+        "url": "https://codeberg.org/kampka/nix-flake-crowdsec.git"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://codeberg.org/kampka/nix-flake-crowdsec.git"
+      }
+    },
     "deploy-rs": {
       "inputs": {
         "flake-compat": "flake-compat",
@@ -133,7 +154,24 @@
     },
     "flake-utils": {
       "inputs": {
-        "systems": "systems_2"
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "id": "flake-utils",
+        "type": "indirect"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_3"
       },
       "locked": {
         "lastModified": 1731533236,
@@ -248,7 +286,7 @@
     },
     "nix-vscode-extensions": {
       "inputs": {
-        "flake-utils": "flake-utils",
+        "flake-utils": "flake-utils_2",
         "nixpkgs": [
           "nixpkgs"
         ]
@@ -373,6 +411,7 @@
     "root": {
       "inputs": {
         "betterfox": "betterfox",
+        "crowdsec": "crowdsec",
         "deploy-rs": "deploy-rs",
         "disko": "disko",
         "firefox-addons": "firefox-addons",
@@ -439,6 +478,21 @@
         "type": "github"
       }
     },
+    "systems_3": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "treefmt-nix": {
       "inputs": {
         "nixpkgs": [
@@ -461,7 +515,7 @@
     },
     "utils": {
       "inputs": {
-        "systems": "systems"
+        "systems": "systems_2"
       },
       "locked": {
         "lastModified": 1701680307,

flake.nix

@@ -43,6 +43,11 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
+    crowdsec = {
+      url = "git+https://codeberg.org/kampka/nix-flake-crowdsec.git";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
     nix-vscode-extensions = {
       url = "github:nix-community/nix-vscode-extensions";
       inputs.nixpkgs.follows = "nixpkgs";

hosts/cirrus/default.nix

@@ -17,6 +17,15 @@
       subdomain = "docs";
       backups.enable = true;
     };
+
+    crowdsec = {
+      enable = true;
+      firewallBouncer.enable = true;
+      sources = [
+        "iptables"
+        "caddy"
+      ];
+    };
   };
 
   services.caddy = {

hosts/cirrus/secrets.yaml

@@ -7,6 +7,8 @@ restic:
   environment: ENC[AES256_GCM,data:oPgJ20N7eO0W+SnRPA/uaGDbYBpKX3jWixuVIG0+eBRRlaPWBFpJKA7CK9oVvwuqQUtGiRnoR2gqO42C22WRSiHXqe1zoarhvQMcXy8CTQd6Y+k5iMspSzMZynfkMapooK4=,iv:Ub1ONOcoEZ52E8W1qK93xpmYXMUiVszFbHoO/pUa/Mo=,tag:2yTJZmirhPIN01cB5F0Lsw==,type:str]
   password: ENC[AES256_GCM,data:gMd4G8o83r3sTZEH1kRkn05Mye96sHV2mdRWNbbS,iv:E2hBYbvpCMDul81lgUBNVr5Fm7x0u1f9cEkma9jKwYE=,tag:CeFrP3pO1VmGxcvj7b7pYA==,type:str]
 healthchecks-ping-key: ENC[AES256_GCM,data:HT6bEtZ4ii3na8VDRA59GHtRuaOV+w==,iv:ZZlnpDPoPUYgq/jHOfCqHMUmKpPUTpXmZp3GWxYAL3I=,tag:Lg97lItvoGzXqoz6Pwadfw==,type:str]
+crowdsec:
+  enrollment-key: ENC[AES256_GCM,data:gcoLmZGUqH0brtvcXiZwXr7CSc9GfEWkvA==,iv:ZLz/3LXSYVXQtcyPZ62qOuslexdXh7jvX0MzoXjlRgM=,tag:V/SwXnNDQkiRQEu90ZTnTg==,type:str]
 sops:
   age:
     - recipient: age1mpq8m4p7dnxh5ze3fh7etd2k6sp85zdnmp9te3e9chcw4pw07pcq960zh5
@@ -27,7 +29,7 @@ sops:
         aHNody9YR2ZKTDNINmNvbGNHb0dCRVkKXcUQxU0Craqkze0l0mH75MKTnkf7a/ae
         XeqWVJRO1WpG+UhF3QB3yMq9uy0vlc3JnD3LsE0inWUSl0s6AgDZOg==
         -----END AGE ENCRYPTED FILE-----
-  lastmodified: "2025-05-24T12:58:09Z"
-  mac: ENC[AES256_GCM,data:V9bfym3Qm6Rf11UJY3VeWXfeA6wg/nFqroz9SMOSJHs6G8+QQ9NrOs6/5JP9mEZE9d6pR4Sqi/5WOFboi24dbAwx/0LVWDiWOMKzIDnOEB6FPYACefSBafrW7OAd5M9xacNTsLAHZMZytGpH0P+WW3EgQz2HuSJl/L42TunmyZo=,iv:KhoDvgOOOKu/RkDOE9DgGZdVB0TibAWjPLJBFNvPNuw=,tag:q3F8PdSDP1ORDpOiy8W+4Q==,type:str]
+  lastmodified: "2025-05-24T18:15:52Z"
+  mac: ENC[AES256_GCM,data:FIDuoiN8YmRCDHvl0SYN+HZKP+zgE1ZDEBSD8mePkLd6WfBtKQOS7bXr0GS5lfdui0H2e8tWDz1pMENlI69S3ZimAc8AYCJwyw0cyzRCjUNvicgJaxVP70faOhXTKXQnCu5Dxul/bYpzqvhhVUzhRfhoPxLLCSU7Hh05kqt3OJw=,iv:fWy6mXq0AQTjpWs1jyzqzwKA/hjd0Pvig9j1ZbdDDng=,tag:iHYPmJn6x6HJj3Q6LbEC/A==,type:str]
   unencrypted_suffix: _unencrypted
   version: 3.10.2

modules/system/crowdsec/default.nix

@@ -0,0 +1,74 @@
+{
+  config,
+  inputs,
+  pkgs,
+  lib,
+  ...
+}:
+let
+  cfg = config.myConfig.crowdsec;
+in
+{
+  imports = [ inputs.crowdsec.nixosModules.crowdsec ];
+
+  options.myConfig.crowdsec = {
+    enable = lib.mkEnableOption "";
+    apiPort = lib.mkOption {
+      type = lib.types.port;
+      default = 8080;
+    };
+    sources = lib.mkOption {
+      type = lib.types.listOf (
+        lib.types.enum [
+          "iptables"
+          "caddy"
+        ]
+      );
+      default = [ ];
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    nixpkgs.overlays = [ inputs.crowdsec.overlays.default ];
+
+    sops.secrets."crowdsec/enrollment-key".owner = config.users.users.crowdsec.name;
+
+    services.crowdsec = {
+      enable = true;
+      package = inputs.crowdsec.packages.${pkgs.system}.crowdsec;
+      enrollKeyFile = config.sops.secrets."crowdsec/enrollment-key".path;
+      settings = {
+        api.server.listen_uri = "127.0.0.1:${toString cfg.apiPort}";
+        prometheus.enabled = false;
+      };
+
+      acquisitions = [
+        (lib.mkIf (lib.elem "iptables" cfg.sources) {
+          source = "journalctl";
+          journalctl_filter = [ "-k" ];
+          labels.type = "syslog";
+        })
+        (lib.mkIf (lib.elem "caddy" cfg.sources) {
+          source = "journalctl";
+          journalctl_filter = [ "_SYSTEMD_UNIT=caddy.service" ];
+          labels.type = "syslog";
+        })
+      ];
+    };
+
+    systemd.services.crowdsec.preStart =
+      let
+        collections = lib.flatten [
+          "crowdsecurity/linux"
+          (lib.optional (lib.elem "iptables" cfg.sources) "crowdsecurity/iptables")
+          (lib.optional (lib.elem "caddy" cfg.sources) "crowdsecurity/caddy")
+        ];
+        addCollection = collection: ''
+          if ! cscli collections list | grep -q "${collection}"; then
+            cscli collections install ${collection}
+          fi
+        '';
+      in
+      collections |> lib.map addCollection |> lib.concatLines;
+  };
+}

modules/system/crowdsec/firewall-bouncer.nix

@@ -0,0 +1,32 @@
+{
+  config,
+  inputs,
+  pkgs,
+  lib,
+  ...
+}:
+let
+  cfg = config.myConfig.crowdsec;
+in
+{
+  imports = [ inputs.crowdsec.nixosModules.crowdsec-firewall-bouncer ];
+
+  options.myConfig.crowdsec.firewallBouncer.enable = lib.mkEnableOption "";
+
+  config = lib.mkIf cfg.firewallBouncer.enable {
+    services.crowdsec-firewall-bouncer = {
+      enable = true;
+      package = inputs.crowdsec.packages.${pkgs.system}.crowdsec-firewall-bouncer;
+      settings = {
+        api_key = "cs-firewall-bouncer";
+        api_url = "http://127.0.0.1:${toString cfg.apiPort}";
+      };
+    };
+
+    systemd.services.crowdsec.preStart = ''
+      if ! cscli bouncers list | grep -q "firewall-bouncer"; then
+        cscli bouncers add "firewall-bouncer" --key "cs-firewall-bouncer"
+      fi
+    '';
+  };
+}