107 lines
3.4 KiB
Nix
107 lines
3.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.security.dhparams;
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in
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{
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options = {
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security.dhparams = {
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params = mkOption {
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description =
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''
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Diffie-Hellman parameters to generate.
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The value is the size (in bits) of the DH params to generate. The
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generated DH params path can be found in
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<filename><replaceable>security.dhparams.path</replaceable>/<replaceable>name</replaceable>.pem</filename>.
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Note: The name of the DH params is taken as being the name of the
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service it serves: the params will be generated before the said
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service is started.
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Warning: If you are removing all dhparams from this list, you have
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to leave security.dhparams.enable for at least one activation in
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order to have them be cleaned up. This also means if you rollback to
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a version without any dhparams the existing ones won't be cleaned
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up.
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'';
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type = with types; attrsOf int;
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default = {};
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example = { nginx = 3072; };
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};
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path = mkOption {
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description =
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''
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Path to the directory in which Diffie-Hellman parameters will be
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stored.
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'';
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type = types.str;
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default = "/var/lib/dhparams";
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};
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enable = mkOption {
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description =
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''
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Whether to generate new DH params and clean up old DH params.
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'';
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default = false;
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type = types.bool;
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};
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};
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};
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config = mkIf cfg.enable {
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systemd.services = {
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dhparams-init = {
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description = "Cleanup old Diffie-Hellman parameters";
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wantedBy = [ "multi-user.target" ]; # Clean up even when no DH params is set
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serviceConfig.Type = "oneshot";
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script =
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# Create directory
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''
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if [ ! -d ${cfg.path} ]; then
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mkdir -p ${cfg.path}
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fi
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'' +
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# Remove old dhparams
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''
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for file in ${cfg.path}/*; do
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if [ ! -f "$file" ]; then
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continue
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fi
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'' + concatStrings (mapAttrsToList (name: value:
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''
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if [ "$file" == "${cfg.path}/${name}.pem" ] && \
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${pkgs.openssl}/bin/openssl dhparam -in "$file" -text | head -n 1 | grep "(${toString value} bit)" > /dev/null; then
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continue
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fi
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''
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) cfg.params) +
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''
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rm $file
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done
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# TODO: Ideally this would be removing the *former* cfg.path, though this
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# does not seem really important as changes to it are quite unlikely
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rmdir --ignore-fail-on-non-empty ${cfg.path}
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'';
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};
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} //
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mapAttrs' (name: value: nameValuePair "dhparams-gen-${name}" {
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description = "Generate Diffie-Hellman parameters for ${name} if they don't exist yet";
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after = [ "dhparams-init.service" ];
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before = [ "${name}.service" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig.Type = "oneshot";
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script =
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''
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mkdir -p ${cfg.path}
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if [ ! -f ${cfg.path}/${name}.pem ]; then
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${pkgs.openssl}/bin/openssl dhparam -out ${cfg.path}/${name}.pem ${toString value}
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fi
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'';
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}) cfg.params;
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};
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}
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