From bf5f01ee527fd7ca512741da0d920b5696309448 Mon Sep 17 00:00:00 2001
From: Yureka <yuka@yuka.dev>
Date: Wed, 10 May 2023 14:28:38 +0200
Subject: nixos/fastnetmon-advanced: init

---
 nixos/doc/manual/release-notes/rl-2311.section.md  |   2 +
 nixos/modules/module-list.nix                      |   1 +
 .../services/networking/fastnetmon-advanced.nix    | 222 +++++++++++++++++++++
 3 files changed, 225 insertions(+)
 create mode 100644 nixos/modules/services/networking/fastnetmon-advanced.nix

(limited to 'nixos')

diff --git a/nixos/doc/manual/release-notes/rl-2311.section.md b/nixos/doc/manual/release-notes/rl-2311.section.md
index be4ce3c27d8..d3ff83afddb 100644
--- a/nixos/doc/manual/release-notes/rl-2311.section.md
+++ b/nixos/doc/manual/release-notes/rl-2311.section.md
@@ -107,6 +107,8 @@
 
 - [NNCP](http://www.nncpgo.org/). Added nncp-daemon and nncp-caller services. Configuration is set with [programs.nncp.settings](#opt-programs.nncp.settings) and the daemons are enabled at [services.nncp](#opt-services.nncp.caller.enable).
 
+- [FastNetMon Advanced](https://fastnetmon.com/product-overview/), a commercial high performance DDoS detector / sensor. Available as [services.fastnetmon-advanced](#opt-services.fastnetmon-advanced.enable).
+
 - [tuxedo-rs](https://github.com/AaronErhardt/tuxedo-rs), Rust utilities for interacting with hardware from TUXEDO Computers.
 
 - [audiobookshelf](https://github.com/advplyr/audiobookshelf/), a self-hosted audiobook and podcast server. Available as [services.audiobookshelf](#opt-services.audiobookshelf.enable).
diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 47b262bf4d9..be5ae17e13e 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -907,6 +907,7 @@
   ./services/networking/eternal-terminal.nix
   ./services/networking/expressvpn.nix
   ./services/networking/fakeroute.nix
+  ./services/networking/fastnetmon-advanced.nix
   ./services/networking/ferm.nix
   ./services/networking/firefox-syncserver.nix
   ./services/networking/fireqos.nix
diff --git a/nixos/modules/services/networking/fastnetmon-advanced.nix b/nixos/modules/services/networking/fastnetmon-advanced.nix
new file mode 100644
index 00000000000..26e8ad8b76d
--- /dev/null
+++ b/nixos/modules/services/networking/fastnetmon-advanced.nix
@@ -0,0 +1,222 @@
+{ config, lib, pkgs, ... }:
+
+let
+  # Background information: FastNetMon requires a MongoDB to start. This is because
+  # it uses MongoDB to store its configuration. That is, in a normal setup there is
+  # one collection with one document.
+  # To provide declarative configuration in our NixOS module, this database is
+  # completely emptied and replaced on each boot by the fastnetmon-setup service
+  # using the configuration backup functionality.
+
+  cfg = config.services.fastnetmon-advanced;
+  settingsFormat = pkgs.formats.yaml { };
+
+  # obtain the default configs by starting up ferretdb and fcli in a derivation
+  default_configs = pkgs.runCommand "default-configs" {
+    nativeBuildInputs = [
+      pkgs.ferretdb
+      pkgs.fastnetmon-advanced # for fcli
+      pkgs.proot
+    ];
+  } ''
+    mkdir ferretdb fastnetmon $out
+    FERRETDB_TELEMETRY="disable" FERRETDB_HANDLER="sqlite" FERRETDB_STATE_DIR="$PWD/ferretdb" FERRETDB_SQLITE_URL="file:$PWD/ferretdb/" ferretdb &
+
+    cat << EOF > fastnetmon/fastnetmon.conf
+    ${builtins.toJSON {
+      mongodb_username = "";
+    }}
+    EOF
+    proot -b fastnetmon:/etc/fastnetmon -0 fcli create_configuration
+    proot -b fastnetmon:/etc/fastnetmon -0 fcli set bgp default
+    proot -b fastnetmon:/etc/fastnetmon -0 fcli export_configuration backup.tar
+    tar -C $out --no-same-owner -xvf backup.tar
+  '';
+
+  # merge the user configs into the default configs
+  config_tar = pkgs.runCommand "fastnetmon-config.tar" {
+    nativeBuildInputs = with pkgs; [ jq ];
+  } ''
+    jq -s add ${default_configs}/main.json ${pkgs.writeText "main-add.json" (builtins.toJSON cfg.settings)} > main.json
+    mkdir hostgroup
+    ${lib.concatImapStringsSep "\n" (pos: hostgroup: ''
+      jq -s add ${default_configs}/hostgroup/0.json ${pkgs.writeText "hostgroup-${toString (pos - 1)}-add.json" (builtins.toJSON hostgroup)} > hostgroup/${toString (pos - 1)}.json
+    '') hostgroups}
+    mkdir bgp
+    ${lib.concatImapStringsSep "\n" (pos: bgp: ''
+      jq -s add ${default_configs}/bgp/0.json ${pkgs.writeText "bgp-${toString (pos - 1)}-add.json" (builtins.toJSON bgp)} > bgp/${toString (pos - 1)}.json
+    '') bgpPeers}
+    tar -cf $out main.json ${lib.concatImapStringsSep " " (pos: _: "hostgroup/${toString (pos - 1)}.json") hostgroups} ${lib.concatImapStringsSep " " (pos: _: "bgp/${toString (pos - 1)}.json") bgpPeers}
+  '';
+
+  hostgroups = lib.mapAttrsToList (name: hostgroup: { inherit name; } // hostgroup) cfg.hostgroups;
+  bgpPeers = lib.mapAttrsToList (name: bgpPeer: { inherit name; } // bgpPeer) cfg.bgpPeers;
+
+in {
+  options.services.fastnetmon-advanced = with lib; {
+    enable = mkEnableOption "the fastnetmon-advanced DDoS Protection daemon";
+
+    settings = mkOption {
+      description = ''
+        Extra configuration options to declaratively load into FastNetMon Advanced.
+
+        See the [FastNetMon Advanced Configuration options reference](https://fastnetmon.com/docs-fnm-advanced/fastnetmon-advanced-configuration-options/) for more details.
+      '';
+      type = settingsFormat.type;
+      default = {};
+      example = literalExpression ''
+        {
+          networks_list = [ "192.0.2.0/24" ];
+          gobgp = true;
+          gobgp_flow_spec_announces = true;
+        }
+      '';
+    };
+    hostgroups = mkOption {
+      description = "Hostgroups to declaratively load into FastNetMon Advanced";
+      type = types.attrsOf settingsFormat.type;
+      default = {};
+    };
+    bgpPeers = mkOption {
+      description = "BGP Peers to declaratively load into FastNetMon Advanced";
+      type = types.attrsOf settingsFormat.type;
+      default = {};
+    };
+
+    enableAdvancedTrafficPersistence = mkOption {
+      description = "Store historical flow data in clickhouse";
+      type = types.bool;
+      default = false;
+    };
+
+    traffic_db.settings = mkOption {
+      type = settingsFormat.type;
+      description = "Additional settings for /etc/fastnetmon/traffic_db.conf";
+    };
+  };
+
+  config = lib.mkMerge [ (lib.mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [
+      fastnetmon-advanced # for fcli
+    ];
+
+    environment.etc."fastnetmon/license.lic".source = "/var/lib/fastnetmon/license.lic";
+    environment.etc."fastnetmon/gobgpd.conf".source = "/run/fastnetmon/gobgpd.conf";
+    environment.etc."fastnetmon/fastnetmon.conf".source = pkgs.writeText "fastnetmon.conf" (builtins.toJSON {
+      mongodb_username = "";
+    });
+
+    services.ferretdb.enable = true;
+
+    systemd.services.fastnetmon-setup = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "ferretdb.service" ];
+      path = with pkgs; [ fastnetmon-advanced config.systemd.package ];
+      script = ''
+        fcli create_configuration
+        fcli delete hostgroup global
+        fcli import_configuration ${config_tar}
+        systemctl --no-block try-restart fastnetmon
+      '';
+      serviceConfig.Type = "oneshot";
+    };
+
+    systemd.services.fastnetmon = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "ferretdb.service" "fastnetmon-setup.service" "polkit.service" ];
+      path = with pkgs; [ iproute2 ];
+      unitConfig = {
+        # Disable logic which shuts service when we do too many restarts
+        # We do restarts from sudo fcli commit and it's expected that we may have many restarts
+        # Details: https://github.com/systemd/systemd/issues/2416
+        StartLimitInterval = 0;
+      };
+      serviceConfig = {
+        ExecStart = "${pkgs.fastnetmon-advanced}/bin/fastnetmon --log_to_console";
+
+        LimitNOFILE = 65535;
+        # Restart service when it fails due to any reasons, we need to keep processing traffic no matter what happened
+        Restart= "on-failure";
+        RestartSec= "5s";
+
+        DynamicUser = true;
+        CacheDirectory = "fastnetmon";
+        RuntimeDirectory = "fastnetmon"; # for gobgpd config
+        StateDirectory = "fastnetmon"; # for license file
+      };
+    };
+
+    security.polkit.enable = true;
+    security.polkit.extraConfig = ''
+      polkit.addRule(function(action, subject) {
+        if (action.id == "org.freedesktop.systemd1.manage-units" &&
+          subject.isInGroup("fastnetmon")) {
+          if (action.lookup("unit") == "gobgp.service") {
+            var verb = action.lookup("verb");
+            if (verb == "start" || verb == "stop" || verb == "restart") {
+              return polkit.Result.YES;
+            }
+          }
+        }
+      });
+    '';
+
+    # We don't use the existing gobgp NixOS module and package, because the gobgp
+    # version might not be compatible with fastnetmon. Also, the service name
+    # _must_ be 'gobgp' and not 'gobgpd', so that fastnetmon can reload the config.
+    systemd.services.gobgp = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      description = "GoBGP Routing Daemon";
+      unitConfig = {
+        ConditionPathExists = "/run/fastnetmon/gobgpd.conf";
+      };
+      serviceConfig = {
+        Type = "notify";
+        ExecStartPre = "${pkgs.fastnetmon-advanced}/bin/fnm-gobgpd -f /run/fastnetmon/gobgpd.conf -d";
+        SupplementaryGroups = [ "fastnetmon" ];
+        ExecStart = "${pkgs.fastnetmon-advanced}/bin/fnm-gobgpd -f /run/fastnetmon/gobgpd.conf --sdnotify";
+        ExecReload = "${pkgs.fastnetmon-advanced}/bin/fnm-gobgpd -r";
+        DynamicUser = true;
+        AmbientCapabilities = "cap_net_bind_service";
+      };
+    };
+  })
+
+  (lib.mkIf (cfg.enable && cfg.enableAdvancedTrafficPersistence) {
+    ## Advanced Traffic persistence
+    ## https://fastnetmon.com/docs-fnm-advanced/fastnetmon-advanced-traffic-persistency/
+
+    services.clickhouse.enable = true;
+
+    services.fastnetmon-advanced.settings.traffic_db = true;
+
+    services.fastnetmon-advanced.traffic_db.settings = {
+      clickhouse_batch_size = lib.mkDefault 1000;
+      clickhouse_batch_delay = lib.mkDefault 1;
+      traffic_db_host = lib.mkDefault "127.0.0.1";
+      traffic_db_port = lib.mkDefault 8100;
+      clickhouse_host = lib.mkDefault "127.0.0.1";
+      clickhouse_port = lib.mkDefault 9000;
+      clickhouse_user = lib.mkDefault "default";
+      clickhouse_password = lib.mkDefault "";
+    };
+    environment.etc."fastnetmon/traffic_db.conf".text = builtins.toJSON cfg.traffic_db.settings;
+
+    systemd.services.traffic_db = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      serviceConfig = {
+        ExecStart = "${pkgs.fastnetmon-advanced}/bin/traffic_db";
+        # Restart service when it fails due to any reasons, we need to keep processing traffic no matter what happened
+        Restart= "on-failure";
+        RestartSec= "5s";
+
+        DynamicUser = true;
+      };
+    };
+
+  }) ];
+
+  meta.maintainers = lib.teams.wdz.members;
+}
-- 
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