os/modules/paranoia/default.nix

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{ config, lib, ... }:
with lib;
let
psCfg = config.pub-solar;
cfg = config.pub-solar.paranoia;
in
{
options.pub-solar.paranoia = {
enable = mkOption {
description = ''
Only offer hibernation instead of screen locking and sleeping. This only makes sense
if your hard drive is encrypted, and ensures that the contents of your drive are
encrypted if you are not actively using the device.
'';
default = false;
type = types.bool;
};
};
config = mkIf cfg.enable {
pub-solar.core.hibernation.enable = true;
services.logind.lidSwitch = "hibernate";
# The options below are directly taken from or inspired by
# https://xeiaso.net/blog/paranoid-nixos-2021-07-18
# Don't set this if you need sftp
services.openssh.allowSFTP = false;
services.openssh.openFirewall = false; # Lock yourself out
# Limit the use of sudo to the group wheel
security.sudo.execWheelOnly = true;
# Remove the complete default environment of packages like
# nano, perl and rsync
environment.defaultPackages = lib.mkForce [ ];
# fileSystems."/".options = [ "noexec" ];
services.openssh = {
kbdInteractiveAuthentication = false;
extraConfig = ''
AllowTcpForwarding yes
X11Forwarding no
AllowAgentForwarding no
AllowStreamLocalForwarding no
AuthenticationMethods publickey
'';
};
};
}