345 lines
10 KiB
Nix
345 lines
10 KiB
Nix
{ config, options, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.gpg-agent;
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gpgPkg = config.programs.gpg.package;
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homedir = config.programs.gpg.homedir;
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gpgSshSupportStr = ''
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${gpgPkg}/bin/gpg-connect-agent updatestartuptty /bye > /dev/null
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'';
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gpgInitStr = ''
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GPG_TTY="$(tty)"
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export GPG_TTY
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'' + optionalString cfg.enableSshSupport gpgSshSupportStr;
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gpgFishInitStr = ''
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set -gx GPG_TTY (tty)
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'' + optionalString cfg.enableSshSupport gpgSshSupportStr;
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# mimic `gpgconf` output for use in `systemd` unit definitions.
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# we cannot use `gpgconf` directly because it heavily depends on system
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# state, but we need the values at build time. original:
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# https://github.com/gpg/gnupg/blob/c6702d77d936b3e9d91b34d8fdee9599ab94ee1b/common/homedir.c#L672-L681
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gpgconf = dir:
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let
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hash =
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substring 0 24 (hexStringToBase32 (builtins.hashString "sha1" homedir));
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in if homedir == options.programs.gpg.homedir.default then
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"%t/gnupg/${dir}"
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else
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"%t/gnupg/d.${hash}/${dir}";
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# Act like `xxd -r -p | base32` but with z-base-32 alphabet and no trailing padding.
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# Written in Nix for purity.
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hexStringToBase32 = let
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mod = a: b: a - a / b * b;
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pow2 = elemAt [ 1 2 4 8 16 32 64 128 256 ];
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splitChars = s: init (tail (splitString "" s));
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base32Alphabet = splitChars "ybndrfg8ejkmcpqxot1uwisza345h769";
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hexToIntTable = listToAttrs (genList (x: {
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name = toLower (toHexString x);
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value = x;
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}) 16);
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initState = {
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ret = "";
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buf = 0;
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bufBits = 0;
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};
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go = { ret, buf, bufBits }:
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hex:
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let
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buf' = buf * pow2 4 + hexToIntTable.${hex};
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bufBits' = bufBits + 4;
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extraBits = bufBits' - 5;
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in if bufBits >= 5 then {
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ret = ret + elemAt base32Alphabet (buf' / pow2 extraBits);
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buf = mod buf' (pow2 extraBits);
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bufBits = bufBits' - 5;
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} else {
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ret = ret;
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buf = buf';
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bufBits = bufBits';
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};
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in hexString: (foldl' go initState (splitChars hexString)).ret;
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in {
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meta.maintainers = [ maintainers.rycee ];
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options = {
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services.gpg-agent = {
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enable = mkEnableOption "GnuPG private key agent";
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defaultCacheTtl = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Set the time a cache entry is valid to the given number of
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seconds.
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'';
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};
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defaultCacheTtlSsh = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Set the time a cache entry used for SSH keys is valid to the
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given number of seconds.
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'';
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};
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maxCacheTtl = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Set the maximum time a cache entry is valid to n seconds. After this
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time a cache entry will be expired even if it has been accessed
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recently or has been set using gpg-preset-passphrase. The default is
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2 hours (7200 seconds).
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'';
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};
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maxCacheTtlSsh = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = ''
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Set the maximum time a cache entry used for SSH keys is valid to n
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seconds. After this time a cache entry will be expired even if it has
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been accessed recently or has been set using gpg-preset-passphrase.
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The default is 2 hours (7200 seconds).
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'';
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};
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enableSshSupport = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to use the GnuPG key agent for SSH keys.
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'';
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};
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sshKeys = mkOption {
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type = types.nullOr (types.listOf types.str);
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default = null;
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description = ''
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Which GPG keys (by keygrip) to expose as SSH keys.
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'';
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};
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enableExtraSocket = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable extra socket of the GnuPG key agent (useful for GPG
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Agent forwarding).
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'';
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};
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verbose = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to produce verbose output.
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'';
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};
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grabKeyboardAndMouse = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Tell the pinentry to grab the keyboard and mouse. This
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option should in general be used to avoid X-sniffing
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attacks. When disabled, this option passes
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{option}`no-grab` setting to gpg-agent.
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'';
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};
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enableScDaemon = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Make use of the scdaemon tool. This option has the effect of
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enabling the ability to do smartcard operations. When
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disabled, this option passes
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{option}`disable-scdaemon` setting to gpg-agent.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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example = ''
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allow-emacs-pinentry
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allow-loopback-pinentry
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'';
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description = ''
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Extra configuration lines to append to the gpg-agent
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configuration file.
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'';
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};
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pinentryFlavor = mkOption {
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type = types.nullOr (types.enum pkgs.pinentry.flavors);
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example = "gnome3";
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default = "gtk2";
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description = ''
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Which pinentry interface to use. If not
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`null`, it sets
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{option}`pinentry-program` in
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{file}`gpg-agent.conf`. Beware that
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`pinentry-gnome3` may not work on non-Gnome
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systems. You can fix it by adding the following to your
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system configuration:
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```nix
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services.dbus.packages = [ pkgs.gcr ];
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```
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For this reason, the default is `gtk2` for
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now.
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'';
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};
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enableBashIntegration = mkEnableOption "Bash integration" // {
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default = true;
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};
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enableZshIntegration = mkEnableOption "Zsh integration" // {
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default = true;
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};
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enableFishIntegration = mkEnableOption "Fish integration" // {
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default = true;
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};
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};
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};
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config = mkIf cfg.enable (mkMerge [
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{
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home.file."${homedir}/gpg-agent.conf".text = concatStringsSep "\n"
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(optional (cfg.enableSshSupport) "enable-ssh-support"
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++ optional cfg.grabKeyboardAndMouse "grab"
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++ optional (!cfg.enableScDaemon) "disable-scdaemon"
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++ optional (cfg.defaultCacheTtl != null)
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"default-cache-ttl ${toString cfg.defaultCacheTtl}"
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++ optional (cfg.defaultCacheTtlSsh != null)
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"default-cache-ttl-ssh ${toString cfg.defaultCacheTtlSsh}"
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++ optional (cfg.maxCacheTtl != null)
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"max-cache-ttl ${toString cfg.maxCacheTtl}"
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++ optional (cfg.maxCacheTtlSsh != null)
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"max-cache-ttl-ssh ${toString cfg.maxCacheTtlSsh}"
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++ optional (cfg.pinentryFlavor != null)
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"pinentry-program ${pkgs.pinentry.${cfg.pinentryFlavor}}/bin/pinentry"
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++ [ cfg.extraConfig ]);
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home.sessionVariablesExtra = optionalString cfg.enableSshSupport ''
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if [[ -z "$SSH_AUTH_SOCK" ]]; then
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export SSH_AUTH_SOCK="$(${gpgPkg}/bin/gpgconf --list-dirs agent-ssh-socket)"
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fi
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'';
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programs.bash.initExtra = mkIf cfg.enableBashIntegration gpgInitStr;
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programs.zsh.initExtra = mkIf cfg.enableZshIntegration gpgInitStr;
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programs.fish.interactiveShellInit =
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mkIf cfg.enableFishIntegration gpgFishInitStr;
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}
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(mkIf (cfg.sshKeys != null) {
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# Trailing newlines are important
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home.file."${homedir}/sshcontrol".text = concatMapStrings (s: ''
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${s}
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'') cfg.sshKeys;
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})
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# The systemd units below are direct translations of the
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# descriptions in the
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#
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# ${gpgPkg}/share/doc/gnupg/examples/systemd-user
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#
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# directory.
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{
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assertions = [
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(hm.assertions.assertPlatform "services.gpg-agent" pkgs platforms.linux)
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];
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systemd.user.services.gpg-agent = {
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Unit = {
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Description = "GnuPG cryptographic agent and passphrase cache";
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Documentation = "man:gpg-agent(1)";
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Requires = "gpg-agent.socket";
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After = "gpg-agent.socket";
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# This is a socket-activated service:
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RefuseManualStart = true;
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};
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Service = {
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ExecStart = "${gpgPkg}/bin/gpg-agent --supervised"
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+ optionalString cfg.verbose " --verbose";
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ExecReload = "${gpgPkg}/bin/gpgconf --reload gpg-agent";
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Environment = [ "GNUPGHOME=${homedir}" ];
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};
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};
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systemd.user.sockets.gpg-agent = {
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Unit = {
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Description = "GnuPG cryptographic agent and passphrase cache";
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Documentation = "man:gpg-agent(1)";
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};
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Socket = {
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ListenStream = gpgconf "S.gpg-agent";
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FileDescriptorName = "std";
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SocketMode = "0600";
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DirectoryMode = "0700";
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};
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Install = { WantedBy = [ "sockets.target" ]; };
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};
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}
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(mkIf cfg.enableSshSupport {
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systemd.user.sockets.gpg-agent-ssh = {
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Unit = {
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Description = "GnuPG cryptographic agent (ssh-agent emulation)";
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Documentation =
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"man:gpg-agent(1) man:ssh-add(1) man:ssh-agent(1) man:ssh(1)";
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};
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Socket = {
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ListenStream = gpgconf "S.gpg-agent.ssh";
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FileDescriptorName = "ssh";
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Service = "gpg-agent.service";
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SocketMode = "0600";
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DirectoryMode = "0700";
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};
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Install = { WantedBy = [ "sockets.target" ]; };
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};
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})
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(mkIf cfg.enableExtraSocket {
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systemd.user.sockets.gpg-agent-extra = {
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Unit = {
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Description =
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"GnuPG cryptographic agent and passphrase cache (restricted)";
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Documentation = "man:gpg-agent(1) man:ssh(1)";
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};
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Socket = {
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ListenStream = gpgconf "S.gpg-agent.extra";
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FileDescriptorName = "extra";
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Service = "gpg-agent.service";
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SocketMode = "0600";
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DirectoryMode = "0700";
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};
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Install = { WantedBy = [ "sockets.target" ]; };
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};
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})
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]);
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}
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