From 0cd6576cdfd78103cf97aa7f6a281995846fcb53 Mon Sep 17 00:00:00 2001
From: tux <t@tux.rs>
Date: Sat, 15 Feb 2025 18:44:41 +0530
Subject: [PATCH] feat: add systemd module for cyber tux

---
 .sops.yaml                  |  5 +++
 hosts/homelab/default.nix   | 13 ++++++
 hosts/homelab/secrets.yaml  | 30 +++++++++++++
 modules/nixos/cyber-tux.nix | 86 +++++++++++++++++++++++++++++++++++++
 4 files changed, 134 insertions(+)
 create mode 100644 hosts/homelab/secrets.yaml
 create mode 100644 modules/nixos/cyber-tux.nix

diff --git a/.sops.yaml b/.sops.yaml
index 00b7ddb..c967869 100644
--- a/.sops.yaml
+++ b/.sops.yaml
@@ -48,3 +48,8 @@ creation_rules:
       - age:
           - *tux
           - *capella
+  - path_regex: hosts/homelab/secrets.yaml$
+    key_groups:
+      - age:
+          - *tux
+          - *homelab
diff --git a/hosts/homelab/default.nix b/hosts/homelab/default.nix
index b7326fd..ea01a54 100755
--- a/hosts/homelab/default.nix
+++ b/hosts/homelab/default.nix
@@ -3,6 +3,7 @@
   username,
   pkgs,
   lib,
+  config,
   ...
 }: {
   imports = [
@@ -15,8 +16,20 @@
     ../../modules/nixos/desktop
     ../../modules/nixos/virtualisation/docker.nix
     ../../modules/nixos/open-webui.nix
+    ../../modules/nixos/cyber-tux.nix
   ];
 
+  sops.secrets = {
+    discord_token = {
+      sopsFile = ./secrets.yaml;
+    };
+  };
+
+  tux.services.cyber-tux = {
+    enable = true;
+    environmentFile = config.sops.secrets.discord_token.path;
+  };
+
   networking = {
     hostName = "homelab";
     networkmanager = {
diff --git a/hosts/homelab/secrets.yaml b/hosts/homelab/secrets.yaml
new file mode 100644
index 0000000..89be44f
--- /dev/null
+++ b/hosts/homelab/secrets.yaml
@@ -0,0 +1,30 @@
+discord_token: ENC[AES256_GCM,data:fZqz6LD3+Svtton5gNCXO5ddWAqW1IyxP3M2DAIXZEIYRHUfAq8h9LES2IHWepjl5qKimxB35zacE/TYK2fitngWtRGVoMDBzzU6VTKNulNV3yFWrPA=,iv:YOplYld+c9vHVC0Srfm89qrh4yUygDiW67X2TdwHKMc=,tag:Ioc2wNLX818fRQ/2PSO7Sw==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age14vktfes95f33vuefwnmuvryas7az04u76dsgyhfvsx73czkvmp2q7njkl4
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSB2YktFRE9KS0h0T0hDTlpF
+            ZEk0VzNTcVE0ampsWVRtSzJ3UHBXL2NlUUh3Cjk5ZnFKVENmTTJHQjgrVWlyOUE1
+            THUrTUFzdWhKejNUNXpsNVpvZVdJWm8KLS0tIDZ5bmYzSVBUVlVORHAzSGtCQmVo
+            a2JuSWVtMi9FMkova3BCd2F0U2VCRzQKonG/AkEn2X2l3vyr0UlJprGW2ZSwrczq
+            xHafyGiU/I1AO/HoB3BXyP8t/Sgn/dy42lspqZ3MoLLlmx7dQeTd+g==
+            -----END AGE ENCRYPTED FILE-----
+        - recipient: age1jg642q775gmnmxeu29gcf3lph8vem4xr8t84cxe809dpd0myrussh49h60
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBxWUowUlB2cWVOclpRMENn
+            TU5za0Y2UHZ5eFNZMEdQWm9xdTZFYkVwS2hNCnRBUU1ndFdiQ09sQjBDb1greC93
+            ejl2OVZTTEtIcWpxUk5RRngrbjRWREEKLS0tIDVrSHhxbmJFdWwyQS9xeWlFZitJ
+            Y1RHaFdXaE9DODJtSTFCSVZWb0xVeUEK4qeBKg3u+vhBIM1dQ7BaOWi/C7Q8hk60
+            vu9Zr075n0+kb5Ab+RH24ZmEoP5PJXjwEfbAnmRTjn0reYn1nfcNYA==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2025-02-15T12:45:59Z"
+    mac: ENC[AES256_GCM,data:NLGe7L/oiG62x4PmQ6FobnuisFmMxYoGhxfqQ4qZdy9emYL/+FnrtFsKTKqZ9IHjrNnCmbk7y+Cds/azC1xGVcaj50jEox87vtqIZ3z0XsD1mJjCAdHkBVzzpQGwHas/5y0Inyj+oKsvQrqVacqYHVA/ES+zMvou8nD+EWIH2LE=,iv:fBVOnwih+QFkYZ8IfMBpQiT1XwSZtzo3VYaBOL3I5o4=,tag:p+ePQsrmcLcnLr2fgWQXQg==,type:str]
+    pgp: []
+    unencrypted_suffix: _unencrypted
+    version: 3.9.4
diff --git a/modules/nixos/cyber-tux.nix b/modules/nixos/cyber-tux.nix
new file mode 100644
index 0000000..5f3ebc2
--- /dev/null
+++ b/modules/nixos/cyber-tux.nix
@@ -0,0 +1,86 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.tux.services.cyber-tux;
+in {
+  options.tux.services.cyber-tux = {
+    enable = mkEnableOption "Enable CyberTux Discord bot";
+
+    user = mkOption {
+      type = types.str;
+      default = "cyber-tux";
+      description = "User under which the CyberTux service runs.";
+    };
+
+    group = mkOption {
+      type = types.str;
+      default = "cyber-tux";
+      description = "Group under which the CyberTux service runs.";
+    };
+
+    environmentFile = mkOption {
+      type = types.path;
+      description = "Environment file containing DISCORD_TOKEN";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services = {
+      cyber-tux = {
+        description = "A discord bot for my server";
+        after = ["network.target"];
+        wantedBy = ["multi-user.target"];
+
+        serviceConfig = {
+          Type = "simple";
+          User = "cyber-tux";
+          Group = "cyber-tux";
+          EnvironmentFile = cfg.environmentFile;
+          ExecStart = getExe pkgs.cyber-tux;
+          Restart = "always";
+
+          LockPersonality = true;
+          MemoryDenyWriteExecute = true;
+          NoNewPrivileges = true;
+          PrivateDevices = true;
+          PrivateIPC = true;
+          PrivateTmp = true;
+          PrivateUsers = true;
+          ProtectClock = true;
+          ProtectControlGroups = true;
+          ProtectHome = true;
+          ProtectHostname = true;
+          ProtectKernelLogs = true;
+          ProtectKernelModules = true;
+          ProtectKernelTunables = true;
+          ProtectProc = "invisible";
+          ProtectSystem = "strict";
+          RestrictNamespaces = "uts ipc pid user cgroup";
+          RestrictRealtime = true;
+          RestrictSUIDSGID = true;
+          SystemCallArchitectures = "native";
+          SystemCallFilter = ["@system-service"];
+          UMask = "0077";
+        };
+      };
+    };
+    # Ensure the user and group exist
+    users.users = mkIf (cfg.user == "cyber-tux") {
+      ${cfg.user} = {
+        isSystemUser = true;
+        group = cfg.group;
+        description = "CyberTux service user";
+        home = "/var/lib/cyber-tux";
+        createHome = true;
+      };
+    };
+
+    users.groups = mkIf (cfg.group == "cyber-tux") {
+      ${cfg.group} = {};
+    };
+  };
+}