3 files changed, 104 insertions, 0 deletions
diff --git a/modules/nessus-daemon/default.nix b/modules/nessus-daemon/default.nix
new file mode 100644
index 0000000..57ec584
--- /dev/null
+++ b/modules/nessus-daemon/default.nix
@@ -0,0 +1,7 @@
+{ pkgs, ... }:
+{
+  imports = [ ./module.nix ];
+  environment.systemPackages = [
+    (pkgs.callPackage ./fhs.nix {})
+  ];
+}
diff --git a/modules/nessus-daemon/fhs.nix b/modules/nessus-daemon/fhs.nix
new file mode 100644
index 0000000..97f5016
--- /dev/null
+++ b/modules/nessus-daemon/fhs.nix
@@ -0,0 +1,59 @@
+{ pkgs ? import <nixpkgs> {}, ... }:
+let
+  debUrl = "https://www.tenable.com/downloads/api/v1/public/pages/nessus-agents/downloads/26786/download?i_agree_to_tenable_license_agreement=true";
+
+  setupNessusAgentDir = pkgs.writeShellScriptBin "setup-nessus-agent-dir" ''
+    set -eu -o pipefail
+    outdir=/opt/nessus_agent
+    if ! [ -f "$outdir/.installed" ]; then
+      echo "First install setup"
+      mkdir -p "$outdir"
+      cp -rf ${nessus-files}/nessus/* "$outdir"
+      chmod -R 755 "$outdir"
+      touch "$outdir/.installed"
+    fi
+  '';
+
+  nessus-files = pkgs.stdenv.mkDerivation {
+    pname = "nessus-files";
+    version = "11.0.2";
+    nativeBuildInputs = [ pkgs.dpkg ];
+    src = pkgs.fetchurl {
+      url = debUrl;
+      sha256 = "sha256-TlO7l50sqILcF/xga+RifvzptcSBk/PGqunhJYzUFYA=";
+    };
+    dontConfigure = true;
+    dontBuild = true;
+    unpackPhase = ''dpkg-deb -x $src .'';
+    installPhase = ''
+      mkdir -p $out/nessus
+      mv opt/nessus_agent/* $out/nessus
+    '';
+  };
+in
+pkgs.buildFHSEnv {
+  name = "nessus-agent-fhs";
+
+  targetPkgs = pkgs: with pkgs; [
+    coreutils
+    openssl_3
+    nettools
+    iproute2
+    procps
+    util-linux
+    glibc
+    zlib
+    sqlite
+  ];
+
+  profile = ''
+    export NESSUS_TZ_DIR=/etc/zoneinfo;
+    export PATH="$PATH:/opt/nessus_agent/bin:/opt/nessus_agent/sbin"
+  '';
+
+  runScript = ''bash -c '
+    echo "Starting service with args: $@";
+    ${setupNessusAgentDir}/bin/setup-nessus-agent-dir;
+    "$@";
+  ' -- '';
+}
diff --git a/modules/nessus-daemon/module.nix b/modules/nessus-daemon/module.nix
new file mode 100644
index 0000000..f33cf0c
--- /dev/null
+++ b/modules/nessus-daemon/module.nix
@@ -0,0 +1,38 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  cfg = config.services.nessus-agent;
+  nessus-agent-fhs = (pkgs.callPackage ./fhs.nix {});
+in {
+  options.services.nessus-agent = {
+    enable = mkEnableOption "nessus agent";
+    openFirewall = mkEnableOption "open firewall for nessus";
+    port = mkOption { type = types.int; default = 8834; };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.tmpfiles.rules = [
+      "d /opt/nessus_agent 0755 root root -"
+    ];
+
+    networking.firewall.allowedTCPPorts = mkIf cfg.openFirewall [ cfg.port ];
+
+    systemd.services.nessus-agent = {
+      description = "Tenable Nessus Agent Service";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      path = [ pkgs.coreutils ];
+      serviceConfig = {
+        Type = "simple";
+        Restart = "on-abort";
+        User = "root";
+        Group = "root";
+        PIDFile = "/opt/nessus_agent/var/nessus/nessus-service.pid";
+        ExecStart = "${nessus-agent-fhs}/bin/nessus-agent-fhs /opt/nessus_agent/sbin/nessus-service -q --port ${toString cfg.port}";
+        ExecReload = "/usr/bin/pkill nessusd";
+        EnvironmentFile = "-/etc/sysconfig/nessusagent";
+        PrivateNetwork = false;
+      };
+    };
+  };
+}