Initial commit

system/core/boot.nix

@@ -0,0 +1,37 @@
+{ config, pkgs, lib, ... }:
+
+{
+  boot = {
+    bootspec.enable = true;
+
+    initrd.systemd.enable = true;
+
+    supportedFilesystems = [ "ntfs" ];
+
+    kernelPackages = pkgs.linuxPackages_latest;
+
+    consoleLogLevel = 3;
+
+    kernelParams = [
+      "quiet"
+      "systemd.show_status=auto"
+      "rd.udev.log_level=3"
+      "plymouth.use-simpledrm"
+    ];
+
+    plymouth.enable = true;
+
+    tmp = {
+      useTmpfs = true;
+      cleanOnBoot = true;
+    };
+  };
+
+  systemd.services.nix-daemon.environment.TMPDIR = "/var/tmp";
+
+  environment.systemPackages = [
+    config.boot.kernelPackages.cpupower
+    pkgs.brightnessctl
+    pkgs.ddcutil
+  ];
+}

system/core/default.nix

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+{lib, ...}: {
+  imports = [
+    ./security.nix
+    ./users.nix
+    ../nix
+    ../programs/fish.nix
+  ];
+
+  i18n = {
+    defaultLocale = "en_US.UTF-8";
+    extraLocaleSettings = {
+      LC_ADDRESS = "nl_NL.UTF-8";
+      LC_IDENTIFICATION = "nl_NL.UTF-8";
+      LC_MEASUREMENT = "nl_NL.UTF-8";
+      LC_MONETARY = "nl_NL.UTF-8";
+      LC_NAME = "nl_NL.UTF-8";
+      LC_NUMERIC = "nl_NL.UTF-8";
+      LC_PAPER = "nl_NL.UTF-8";
+      LC_TELEPHONE = "nl_NL.UTF-8";
+      LC_TIME = "nl_NL.UTF-8";
+    };
+  };
+
+  console.keyMap = "us";
+
+  # don't touch this
+  system = {
+    switch.enable = true;
+    stateVersion = lib.mkDefault "25.05";
+  };
+
+  time = {
+    timeZone = lib.mkDefault "Europe/Amsterdam";
+    hardwareClockInLocalTime = lib.mkDefault true;
+  };
+
+  # compresses half the ram for use as swap
+  zramSwap = {
+    enable = true;
+    algorithm = "zstd";
+    memoryPercent = 25;
+  };
+}

system/core/limine.nix

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+{ lib, pkgs, ... }:
+
+{
+  boot.loader = {
+    limine = {
+      enable = true;
+      efiSupport = true;
+      biosSupport = true;
+      biosDevice = "/dev/nvme1n1";
+      maxGenerations = 10;
+      style.wallpapers = [
+        pkgs.nixos-artwork.wallpapers.simple-dark-gray-bootloader.gnomeFilePath
+      ];
+    };
+
+    grub.enable = lib.mkForce false;
+    systemd-boot.enable = lib.mkForce false;
+  };
+}

system/core/security.nix

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+# security tweaks borrowed from @hlissner
+{
+  boot.kernel.sysctl = {
+    # The Magic SysRq key is a key combo that allows users connected to the
+    # system console of a Linux kernel to perform some low-level commands.
+
+    ## TCP hardening
+    # Prevent bogus ICMP errors from filling up logs.
+    "net.ipv4.icmp_ignore_bogus_error_responses" = 1;
+    # Reverse path filtering causes the kernel to do source validation of
+    # packets received from all interfaces. This can mitigate IP spoofing.
+    "net.ipv4.conf.default.rp_filter" = 1;
+    "net.ipv4.conf.all.rp_filter" = 1;
+    # Do not accept IP source route packets (we're not a router)
+    "net.ipv4.conf.all.accept_source_route" = 0;
+    "net.ipv6.conf.all.accept_source_route" = 0;
+    # Don't send ICMP redirects (again, we're not a router)
+    "net.ipv4.conf.all.send_redirects" = 0;
+    "net.ipv4.conf.default.send_redirects" = 0;
+    # Refuse ICMP redirects (MITM mitigations)
+    "net.ipv4.conf.all.accept_redirects" = 0;
+    "net.ipv4.conf.default.accept_redirects" = 0;
+    "net.ipv4.conf.all.secure_redirects" = 0;
+    "net.ipv4.conf.default.secure_redirects" = 0;
+    "net.ipv6.conf.all.accept_redirects" = 0;
+    "net.ipv6.conf.default.accept_redirects" = 0;
+    # Protects against SYN flood attacks
+    "net.ipv4.tcp_syncookies" = 1;
+    # Incomplete protection again TIME-WAIT assassination
+    "net.ipv4.tcp_rfc1337" = 1;
+
+    ## TCP optimization
+    # TCP Fast Open is a TCP extension that reduces network latency by packing
+    # data in the sender’s initial TCP SYN. Setting 3 = enable TCP Fast Open for
+    # both incoming and outgoing connections:
+    "net.ipv4.tcp_fastopen" = 3;
+
+    # Enable IPv4 forwarding for VPN/container routing
+    "net.ipv4.ip_forward" = 1;
+    # Bufferbloat mitigations + slight improvement in throughput & latency
+    "net.ipv4.tcp_congestion_control" = "bbr";
+    "net.core.default_qdisc" = "cake";
+
+    ## Network performance optimizations
+    # Increase network buffer sizes
+    "net.core.rmem_default" = 262144;
+    "net.core.rmem_max" = 134217728;
+    "net.core.wmem_default" = 262144;
+    "net.core.wmem_max" = 134217728;
+
+    # TCP buffer sizes
+    "net.ipv4.tcp_rmem" = "4096 131072 134217728";
+    "net.ipv4.tcp_wmem" = "4096 65536 134217728";
+
+    # TCP performance
+    "net.ipv4.tcp_window_scaling" = 1;
+    "net.ipv4.tcp_timestamps" = 1;
+    "net.ipv4.tcp_sack" = 1;
+    "net.ipv4.tcp_fack" = 1;
+    "net.ipv4.tcp_low_latency" = 1;
+    "net.ipv4.tcp_adv_win_scale" = 1;
+
+    # Reduce TIME_WAIT sockets
+    "net.ipv4.tcp_fin_timeout" = 15;
+    "net.ipv4.tcp_tw_reuse" = 1;
+  };
+
+  boot.kernelModules = ["tcp_bbr"];
+
+  security = {
+    # allow wayland lockers to unlock the screen
+    # userland niceness
+    rtkit.enable = true;
+    polkit.enable = true;
+
+    sudo-rs = {
+      enable = true;
+      execWheelOnly = true;
+      wheelNeedsPassword = false;
+    };
+
+    # don't ask for password for wheel group
+    sudo = {
+      wheelNeedsPassword = false;
+    };
+  };
+}

system/core/users.nix

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+{pkgs, ...}: {
+  users.users.someone = {
+    isNormalUser = true;
+    shell = pkgs.fish;
+    ignoreShellProgramCheck = true;
+    initialPassword = "nixos";
+    extraGroups = [
+      "adbusers"
+      "input"
+      "networkmanager"
+      "plugdev"
+      "video"
+      "wheel"
+      "kvm"
+      "i2c"
+      "docker"
+    ];
+  };
+}