NixOS Live Image: convert to a flake
Now `nixpkgs` will be pointing to a specific release, which has a much smaller chance to unexpectedly break. Currently 23.11. The next one will be 24.05, 24.11, etc. NixOS *releases* receive security updates, but packages are upgraded conservatively, thus don't generally break. As a result, we should need to worry about NixOS upgrades every 6-12 months. The upgrade means "bump the version number and try to build it". If it breaks, it will generally break only then. Less reactive, more proactive surprises. `flake.nix` was written by @thomaseizinger in https://github.com/drduh/YubiKey-Guide/issues/406. Changes from the original: - change Gnome to xfce. Now it loads with 384MB of RAM and works well with the simplest graphics (hello qemu). - less nasty workaround for hopenpgp-tools. Fixed upstream (https://github.com/NixOS/nixpkgs/pull/279117). - do not default `copytoram`, user can select this option in the bootloader. Here is how to test it: ``` $ nix run .#nixosConfigurations.yubikeyLive.x86_64-linux.config.system.build.vm ``` *Note for the maintainer*: it would be great if you could occasionally run `nix flake update --commit-lock-file`, *especially* after updating github.com/drduh/config.git. Fixes #406 Co-authored-by: Thomas Eizinger <thomas@eizinger.io>
This commit is contained in:
Motiejus Jakštys
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README.md
233
README.md
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@ -289,219 +289,32 @@ $ sudo yum install -y gnupg2 pinentry-curses pcsc-lite pcsc-lite-libs gnupg2-smi
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## NixOS
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Generate an air-gapped NixOS LiveCD image with the given config:
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```nix
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# yubikey-installer.nix
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let
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configuration = { config, lib, pkgs, ... }:
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with pkgs;
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let
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src = fetchGit "https://github.com/drduh/YubiKey-Guide";
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guide = "${src}/README.md";
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contrib = "${src}/contrib";
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drduhConfig = fetchGit "https://github.com/drduh/config";
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gpg-conf = "${drduhConfig}/gpg.conf";
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xserverCfg = config.services.xserver;
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pinentryFlavour = if xserverCfg.desktopManager.lxqt.enable || xserverCfg.desktopManager.plasma5.enable then
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"qt"
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else if xserverCfg.desktopManager.xfce.enable then
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"gtk2"
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else if xserverCfg.enable || config.programs.sway.enable then
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"gnome3"
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else
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"curses";
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# Instead of hard-coding the pinentry program, chose the appropriate one
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# based on the environment of the image the user has chosen to build.
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gpg-agent-conf = runCommand "gpg-agent.conf" {} ''
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sed '/pinentry-program/d' ${drduhConfig}/gpg-agent.conf > $out
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echo "pinentry-program ${pinentry.${pinentryFlavour}}/bin/pinentry" >> $out
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'';
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view-yubikey-guide = writeShellScriptBin "view-yubikey-guide" ''
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viewer="$(type -P xdg-open || true)"
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if [ -z "$viewer" ]; then
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viewer="${glow}/bin/glow -p"
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fi
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exec $viewer "${guide}"
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'';
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shortcut = makeDesktopItem {
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name = "yubikey-guide";
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icon = "${yubikey-manager-qt}/share/ykman-gui/icons/ykman.png";
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desktopName = "drduh's YubiKey Guide";
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genericName = "Guide to using YubiKey for GPG and SSH";
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comment = "Open the guide in a reader program";
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categories = [ "Documentation" ];
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exec = "${view-yubikey-guide}/bin/view-yubikey-guide";
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};
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yubikey-guide = symlinkJoin {
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name = "yubikey-guide";
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paths = [ view-yubikey-guide shortcut ];
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};
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in {
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nixpkgs.overlays = [
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# hopenpgp-tools in nixpkgs 23.05 is out-of-date and has a broken build
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(final: prev: {
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haskellPackages = prev.haskellPackages.override {
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overrides = hsFinal: hsPrev:
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let
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optparse-applicative =
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final.haskell.lib.overrideCabal hsPrev.optparse-applicative
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(oldAttrs: {
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version = "0.18.1.0";
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sha256 =
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"sha256-Y4EatP0m6Cm4hoNkMlqIvjrMeYGfW7UAWy3TuWHsxJE=";
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libraryHaskellDepends =
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(oldAttrs.libraryHaskellDepends or [ ])
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++ (with hsFinal; [
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text
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prettyprinter
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prettyprinter-ansi-terminal
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]);
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});
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hopenpgp-tools =
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(final.haskell.lib.overrideCabal hsPrev.hopenpgp-tools
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(oldAttrs: {
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version = "0.23.8";
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sha256 =
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"sha256-FYvlVE0o/LOYk3a2rucAqm7tg5D/uNQRRrCu/wlDNAE=";
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broken = false;
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})).override { inherit optparse-applicative; };
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in { inherit hopenpgp-tools; };
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};
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})
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];
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isoImage.isoBaseName = lib.mkForce "nixos-yubikey";
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# Uncomment this to disable compression and speed up image creation time
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#isoImage.squashfsCompression = "gzip -Xcompression-level 1";
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# Always copytoram so that, if the image is booted from, e.g., a
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# USB stick, nothing is mistakenly written to persistent storage.
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boot.kernelParams = [ "copytoram" ];
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# Secure defaults
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boot.tmp.cleanOnBoot = true;
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boot.kernel.sysctl = { "kernel.unprivileged_bpf_disabled" = 1; };
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services.pcscd.enable = true;
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services.udev.packages = [ yubikey-personalization ];
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programs = {
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ssh.startAgent = false;
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gnupg.agent = {
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enable = true;
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enableSSHSupport = true;
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};
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};
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environment.systemPackages = [
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# Tools for backing up keys
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paperkey
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pgpdump
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parted
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cryptsetup
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# Yubico's official tools
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yubikey-manager
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yubikey-manager-qt
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yubikey-personalization
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yubikey-personalization-gui
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yubico-piv-tool
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yubioath-flutter
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# Testing
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ent
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(haskell.lib.justStaticExecutables haskellPackages.hopenpgp-tools)
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# Password generation tools
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diceware
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pwgen
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# Miscellaneous tools that might be useful beyond the scope of the guide
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cfssl
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pcsctools
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# This guide itself (run `view-yubikey-guide` on the terminal to open it
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# in a non-graphical environment).
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yubikey-guide
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];
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# Disable networking so the system is air-gapped
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# Comment all of these lines out if you'll need internet access
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boot.initrd.network.enable = false;
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networking.dhcpcd.enable = false;
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networking.dhcpcd.allowInterfaces = [];
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networking.interfaces = {};
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networking.firewall.enable = true;
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networking.useDHCP = false;
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networking.useNetworkd = false;
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networking.wireless.enable = false;
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networking.networkmanager.enable = lib.mkForce false;
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# Unset history so it's never stored
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# Set GNUPGHOME to an ephemeral location and configure GPG with the
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# guide's recommended settings.
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environment.interactiveShellInit = ''
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unset HISTFILE
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export GNUPGHOME="/run/user/$(id -u)/gnupg"
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if [ ! -d "$GNUPGHOME" ]; then
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echo "Creating \$GNUPGHOME…"
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install --verbose -m=0700 --directory="$GNUPGHOME"
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fi
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[ ! -f "$GNUPGHOME/gpg.conf" ] && cp --verbose ${gpg-conf} "$GNUPGHOME/gpg.conf"
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[ ! -f "$GNUPGHOME/gpg-agent.conf" ] && cp --verbose ${gpg-agent-conf} "$GNUPGHOME/gpg-agent.conf"
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echo "\$GNUPGHOME is \"$GNUPGHOME\""
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'';
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# Copy the contents of contrib to the home directory, add a shortcut to
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# the guide on the desktop, and link to the whole repo in the documents
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# folder.
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system.activationScripts.yubikeyGuide = let
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homeDir = "/home/nixos/";
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desktopDir = homeDir + "Desktop/";
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documentsDir = homeDir + "Documents/";
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in ''
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mkdir -p ${desktopDir} ${documentsDir}
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chown nixos ${homeDir} ${desktopDir} ${documentsDir}
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cp -R ${contrib}/* ${homeDir}
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ln -sf ${yubikey-guide}/share/applications/yubikey-guide.desktop ${desktopDir}
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ln -sfT ${src} ${documentsDir}/YubiKey-Guide
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'';
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};
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nixos = import <nixpkgs/nixos/release.nix> {
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inherit configuration;
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supportedSystems = [ "x86_64-linux" ];
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};
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# Choose the one you like:
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#nixos-yubikey = nixos.iso_minimal; # No graphical environment
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#nixos-yubikey = nixos.iso_gnome;
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nixos-yubikey = nixos.iso_plasma5;
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in {
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inherit nixos-yubikey;
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}
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```
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Build the installer and copy it to a USB drive.
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Generate an air-gapped NixOS LiveCD image:
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```console
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$ nix-build yubikey-installer.nix --out-link installer --attr nixos-yubikey
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$ ref=$(git ls-remote https://github.com/drduh/Yubikey-Guide refs/heads/master | awk '{print $1}')
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$ nix build --experimental-features "nix-command flakes" github:drduh/YubiKey-Guide/$ref#nixosConfigurations.yubikeyLive.x86_64-linux.config.system.build.isoImage
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```
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$ sudo cp -v installer/iso/*.iso /dev/sdb; sync
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'installer/iso/nixos-yubikey-22.05beta-248980.gfedcba-x86_64-linux.iso' -> '/dev/sdb'
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If you have this repository checked out:
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Recommended, but optional: update `nixpkgs` and `drduh/config`:
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```console
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$ nix flake update --commit-lock-file
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```
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Generate the ISO:
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```console
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$ nix build --experimental-features "nix-command flakes" .#nixosConfigurations.yubikeyLive.x86_64-linux.config.system.build.isoImage
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```
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Copy it to a USB drive:
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```console
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$ sudo cp -v result/iso/yubikeyLive.iso /dev/sdb; sync
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'result/iso/yubikeyLive.iso' -> '/dev/sdb'
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```
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With this image, you won't need to manually create a [temporary working directory](#temporary-working-directory) or [harden the configuration](#harden-configuration), as it was done when creating the image.
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@ -0,0 +1,44 @@
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{
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"nodes": {
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"drduhConfig": {
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"flake": false,
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"locked": {
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"lastModified": 1697417581,
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"narHash": "sha256-R45L/Xv3z0lJhGt781wDbjaq1qc+sGTmsUt+XHwgf4A=",
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"owner": "drduh",
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"repo": "config",
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"rev": "8c21617100795fea2313656abdf25f93b98fdc30",
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"type": "github"
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},
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"original": {
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"owner": "drduh",
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"repo": "config",
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"type": "github"
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}
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},
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"nixpkgs": {
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"locked": {
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"lastModified": 1706826059,
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"narHash": "sha256-N69Oab+cbt3flLvYv8fYnEHlBsWwdKciNZHUbynVEOA=",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "25e3d4c0d3591c99929b1ec07883177f6ea70c9d",
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"type": "github"
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},
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"original": {
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"owner": "NixOS",
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"ref": "nixos-23.11",
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"repo": "nixpkgs",
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"type": "github"
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}
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},
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"root": {
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"inputs": {
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"drduhConfig": "drduhConfig",
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"nixpkgs": "nixpkgs"
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}
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}
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},
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"root": "root",
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"version": 7
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}
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@ -0,0 +1,210 @@
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{
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description = "A Nix Flake for an xfce-based system with YubiKey setup";
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
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drduhConfig.url = "github:drduh/config";
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drduhConfig.flake = false;
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};
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outputs = {
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self,
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nixpkgs,
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drduhConfig,
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}: let
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mkSystem = system:
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nixpkgs.lib.nixosSystem {
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inherit system;
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modules = [
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"${nixpkgs}/nixos/modules/profiles/all-hardware.nix"
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"${nixpkgs}/nixos/modules/installer/cd-dvd/iso-image.nix"
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(
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{
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lib,
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pkgs,
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config,
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...
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}: let
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gpgAgentConf = pkgs.runCommand "gpg-agent.conf" {} ''
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sed '/pinentry-program/d' ${drduhConfig}/gpg-agent.conf > $out
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echo "pinentry-program ${pkgs.pinentry.curses}/bin/pinentry" >> $out
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'';
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viewYubikeyGuide = pkgs.writeShellScriptBin "view-yubikey-guide" ''
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viewer="$(type -P xdg-open || true)"
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if [ -z "$viewer" ]; then
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viewer="${pkgs.glow}/bin/glow -p"
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fi
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exec $viewer "${self}/README.md"
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'';
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shortcut = pkgs.makeDesktopItem {
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name = "yubikey-guide";
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icon = "${pkgs.yubikey-manager-qt}/share/ykman-gui/icons/ykman.png";
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desktopName = "drduh's YubiKey Guide";
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genericName = "Guide to using YubiKey for GPG and SSH";
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comment = "Open the guide in a reader program";
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categories = ["Documentation"];
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exec = "${viewYubikeyGuide}/bin/view-yubikey-guide";
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};
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yubikeyGuide = pkgs.symlinkJoin {
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name = "yubikey-guide";
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paths = [viewYubikeyGuide shortcut];
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};
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in {
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isoImage = {
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isoName = "yubikeyLive.iso";
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# As of writing, zstd-based iso is 1542M, takes ~2mins to
|
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# compress. If you prefer a smaller image and are happy to
|
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# wait, delete the line below, it will default to a
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# slower-but-smaller xz (1375M in 8mins as of writing).
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squashfsCompression = "zstd";
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appendToMenuLabel = " YubiKey Live ${self.lastModifiedDate}";
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makeEfiBootable = true; # EFI booting
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makeUsbBootable = true; # USB booting
|
||||
};
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||||
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||||
swapDevices = [];
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||||
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boot = {
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tmp.cleanOnBoot = true;
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kernel.sysctl = {"kernel.unprivileged_bpf_disabled" = 1;};
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||||
};
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||||
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services = {
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pcscd.enable = true;
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udev.packages = [pkgs.yubikey-personalization];
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# Automatically log in at the virtual consoles.
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||||
getty.autologinUser = "nixos";
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# Comment out to run in a console for a smaller iso and less RAM.
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xserver = {
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enable = true;
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desktopManager.xfce.enable = true;
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||||
displayManager = {
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lightdm.enable = true;
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||||
autoLogin = {
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||||
enable = true;
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user = "nixos";
|
||||
};
|
||||
};
|
||||
};
|
||||
};
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||||
|
||||
programs = {
|
||||
ssh.startAgent = false;
|
||||
gnupg.agent = {
|
||||
enable = true;
|
||||
enableSSHSupport = true;
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||||
};
|
||||
};
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||||
|
||||
# Use less privileged nixos user
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||||
users.users = {
|
||||
nixos = {
|
||||
isNormalUser = true;
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||||
extraGroups = ["wheel" "video"];
|
||||
initialHashedPassword = "";
|
||||
};
|
||||
root.initialHashedPassword = "";
|
||||
};
|
||||
|
||||
security = {
|
||||
pam.services.lightdm.text = ''
|
||||
auth sufficient pam_succeed_if.so user ingroup wheel
|
||||
'';
|
||||
sudo = {
|
||||
enable = true;
|
||||
wheelNeedsPassword = false;
|
||||
};
|
||||
};
|
||||
|
||||
environment.systemPackages = with pkgs; [
|
||||
# Tools for backing up keys
|
||||
paperkey
|
||||
pgpdump
|
||||
parted
|
||||
cryptsetup
|
||||
|
||||
# Yubico's official tools
|
||||
yubikey-manager
|
||||
yubikey-manager-qt
|
||||
yubikey-personalization
|
||||
yubikey-personalization-gui
|
||||
yubico-piv-tool
|
||||
yubioath-flutter
|
||||
|
||||
# Testing
|
||||
ent
|
||||
haskellPackages.hopenpgp-tools
|
||||
|
||||
# Password generation tools
|
||||
diceware
|
||||
pwgen
|
||||
|
||||
# Might be useful beyond the scope of the guide
|
||||
cfssl
|
||||
pcsctools
|
||||
tmux
|
||||
htop
|
||||
|
||||
# This guide itself (run `view-yubikey-guide` on the terminal
|
||||
# to open it in a non-graphical environment).
|
||||
yubikeyGuide
|
||||
];
|
||||
|
||||
# Disable networking so the system is air-gapped
|
||||
# Comment all of these lines out if you'll need internet access
|
||||
boot.initrd.network.enable = false;
|
||||
networking = {
|
||||
resolvconf.enable = false;
|
||||
dhcpcd.enable = false;
|
||||
dhcpcd.allowInterfaces = [];
|
||||
interfaces = {};
|
||||
firewall.enable = true;
|
||||
useDHCP = false;
|
||||
useNetworkd = false;
|
||||
wireless.enable = false;
|
||||
networkmanager.enable = lib.mkForce false;
|
||||
};
|
||||
|
||||
# Unset history so it's never stored Set GNUPGHOME to an
|
||||
# ephemeral location and configure GPG with the guide's
|
||||
|
||||
environment.interactiveShellInit = ''
|
||||
unset HISTFILE
|
||||
export GNUPGHOME="/run/user/$(id -u)/gnupg"
|
||||
if [ ! -d "$GNUPGHOME" ]; then
|
||||
echo "Creating \$GNUPGHOME…"
|
||||
install --verbose -m=0700 --directory="$GNUPGHOME"
|
||||
fi
|
||||
[ ! -f "$GNUPGHOME/gpg.conf" ] && cp --verbose "${drduhConfig}/gpg.conf" "$GNUPGHOME/gpg.conf"
|
||||
[ ! -f "$GNUPGHOME/gpg-agent.conf" ] && cp --verbose ${gpgAgentConf} "$GNUPGHOME/gpg-agent.conf"
|
||||
echo "\$GNUPGHOME is \"$GNUPGHOME\""
|
||||
'';
|
||||
|
||||
# Copy the contents of contrib to the home directory, add a
|
||||
# shortcut to the guide on the desktop, and link to the whole
|
||||
# repo in the documents folder.
|
||||
system.activationScripts.yubikeyGuide = let
|
||||
homeDir = "/home/nixos/";
|
||||
desktopDir = homeDir + "Desktop/";
|
||||
documentsDir = homeDir + "Documents/";
|
||||
in ''
|
||||
mkdir -p ${desktopDir} ${documentsDir}
|
||||
chown nixos ${homeDir} ${desktopDir} ${documentsDir}
|
||||
|
||||
cp -R ${self}/contrib/* ${homeDir}
|
||||
ln -sf ${yubikeyGuide}/share/applications/yubikey-guide.desktop ${desktopDir}
|
||||
ln -sfT ${self} ${documentsDir}/YubiKey-Guide
|
||||
'';
|
||||
system.stateVersion = "23.11";
|
||||
}
|
||||
)
|
||||
];
|
||||
};
|
||||
in {
|
||||
nixosConfigurations.yubikeyLive.x86_64-linux = mkSystem "x86_64-linux";
|
||||
nixosConfigurations.yubikeyLive.aarch64-linux = mkSystem "aarch64-linux";
|
||||
formatter.x86_64-linux = (import nixpkgs {system = "x86_64-linux";}).alejandra;
|
||||
formatter.aarch64-linux = (import nixpkgs {system = "aarch64-linux";}).alejandra;
|
||||
};
|
||||
}
|
||||
Loading…
Reference in New Issue