add yubikey-installer.nix
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yubikey-installer.nix
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177
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.config = { allowBroken = true; };
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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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boot.kernelPackages = linuxPackages_latest;
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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.cleanTmpDir = 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-desktop
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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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# motiejus addons
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rage
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sops
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tmux
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ssh-to-age
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age-plugin-yubikey
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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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