From 5028503d6d2a21d9e4cb3100a2f9b2795cb5d4bd Mon Sep 17 00:00:00 2001
From: tcmal <me@aria.rip>
Date: Fri, 23 Aug 2024 01:03:50 +0100
Subject: basic kiosk module

---
 profiles/common.nix | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 profiles/common.nix

(limited to 'profiles')

diff --git a/profiles/common.nix b/profiles/common.nix
new file mode 100644
index 0000000..0aa496e
--- /dev/null
+++ b/profiles/common.nix
@@ -0,0 +1,139 @@
+{
+  pkgs,
+  lib,
+  inputs,
+  config,
+  ...
+}:
+let
+  inherit (lib) mkDefault;
+in
+{
+  system.stateVersion = "24.05";
+
+  environment.systemPackages = with pkgs; [
+    vim
+    curl
+    dnsutils
+    gitMinimal
+  ];
+
+  nixpkgs.config.allowUnfree = true;
+  nix = {
+    nixPath = [ ];
+
+    gc = {
+      automatic = true;
+      options = "--delete-older-than 7d";
+    };
+
+    registry = {
+      nixpkgs.to = {
+        owner = "nixos";
+        repo = "nixpkgs";
+        type = "github";
+        rev = inputs.nixpkgs.rev;
+      };
+    };
+
+    settings = {
+      # Improve nix store disk usage
+      auto-optimise-store = true;
+
+      # Prevents impurities in builds
+      sandbox = true;
+
+      experimental-features = [
+        "nix-command"
+        "flakes"
+        "ca-derivations"
+      ];
+      flake-registry = "";
+
+      connect-timeout = 20;
+      log-lines = mkDefault 25;
+
+      max-free = mkDefault (3000 * 1024 * 1024);
+      min-free = mkDefault (512 * 1024 * 1024);
+    };
+  };
+
+  # Quieter logs
+  networking.firewall.logRefusedConnections = false;
+
+  # Unnecessary / nonsensical
+  systemd.services.NetworkManager-wait-online.enable = false;
+  systemd.network.wait-online.enable = false;
+
+  # Hardening
+  users = {
+    mutableUsers = false;
+    users.root.hashedPassword = "$y$j9T$5aHaSd9AkFijcpHRJk07q1$hxRPTrwvo3hZqFcOvNIam.iJ7jDR2ZAeZsTmQYphKpA";
+  };
+  boot.tmp.cleanOnBoot = true;
+  systemd.enableEmergencyMode = false;
+
+  # Perl is a default package
+  environment.defaultPackages = [ ];
+
+  # Things that pull in perl
+  programs.less.lessopen = mkDefault null;
+  boot.enableContainers = mkDefault false;
+
+  # Unnecessary programs/services
+  networking.firewall.enable = false;
+  system.disableInstallerTools = true;
+  documentation = {
+    enable = false;
+    nixos.enable = false;
+    man.enable = false;
+  };
+  environment.variables.BROWSER = "echo";
+  programs.vim.defaultEditor = true;
+  programs.command-not-found.enable = mkDefault false;
+  environment.stub-ld.enable = mkDefault false;
+  services.logrotate.enable = mkDefault false;
+
+  xdg.autostart.enable = mkDefault false;
+  xdg.icons.enable = mkDefault false;
+  xdg.mime.enable = mkDefault false;
+  xdg.sounds.enable = mkDefault false;
+  services.udisks2.enable = mkDefault false;
+
+  # use TCP BBR has significantly increased throughput and reduced latency for connections
+  boot.kernel.sysctl = {
+    "net.core.default_qdisc" = "fq";
+    "net.ipv4.tcp_congestion_control" = "bbr";
+  };
+
+  # Show package version changes on switch
+  system.activationScripts.diff = {
+    supportsDryActivation = true;
+    text = ''
+      if [[ -e /run/current-system ]]; then
+        echo "--- diff to current-system"
+        ${pkgs.nvd}/bin/nvd --nix-bin-dir=${config.nix.package}/bin diff /run/current-system "$systemConfig"
+        echo "---"
+      fi
+    '';
+  };
+
+  # SSH
+  services.openssh = {
+    enable = true;
+    settings = {
+      X11Forwarding = false;
+      KbdInteractiveAuthentication = false;
+      PasswordAuthentication = true;
+      UseDns = false;
+      PermitRootLogin = "yes";
+      KexAlgorithms = [
+        "curve25519-sha256"
+        "curve25519-sha256@libssh.org"
+        "diffie-hellman-group16-sha512"
+        "diffie-hellman-group18-sha512"
+        "sntrup761x25519-sha512@openssh.com"
+      ];
+    };
+  };
+}
-- 
cgit v1.2.3