132 lines
3.4 KiB
Nix
132 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.services.opendkim;
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defaultSock = "local:/run/opendkim/opendkim.sock";
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keyFile = "${cfg.keyPath}/${cfg.selector}.private";
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args = [ "-f" "-l"
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"-p" cfg.socket
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"-d" cfg.domains
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"-k" keyFile
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"-s" cfg.selector
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] ++ optionals (cfg.configFile != null) [ "-x" cfg.configFile ];
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in {
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###### interface
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options = {
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services.opendkim = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = "Whether to enable the OpenDKIM sender authentication system.";
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};
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socket = mkOption {
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type = types.str;
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default = defaultSock;
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description = "Socket which is used for communication with OpenDKIM.";
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};
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user = mkOption {
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type = types.str;
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default = "opendkim";
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description = "User for the daemon.";
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};
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group = mkOption {
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type = types.str;
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default = "opendkim";
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description = "Group for the daemon.";
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};
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domains = mkOption {
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type = types.str;
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default = "csl:${config.networking.hostName}";
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example = "csl:example.com,mydomain.net";
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description = ''
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Local domains set (see <literal>opendkim(8)</literal> for more information on datasets).
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Messages from them are signed, not verified.
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'';
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};
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keyPath = mkOption {
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type = types.path;
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description = ''
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The path that opendkim should put its generated private keys into.
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The DNS settings will be found in this directory with the name selector.txt.
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'';
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default = "/var/lib/opendkim/keys";
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};
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selector = mkOption {
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type = types.str;
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description = "Selector to use when signing.";
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};
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configFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = "Additional opendkim configuration.";
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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users.users = optionalAttrs (cfg.user == "opendkim") (singleton
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{ name = "opendkim";
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group = cfg.group;
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uid = config.ids.uids.opendkim;
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});
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users.groups = optionalAttrs (cfg.group == "opendkim") (singleton
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{ name = "opendkim";
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gid = config.ids.gids.opendkim;
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});
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environment.systemPackages = [ pkgs.opendkim ];
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systemd.services.opendkim = {
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description = "OpenDKIM signing and verification daemon";
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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preStart = ''
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mkdir -p "${cfg.keyPath}"
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cd "${cfg.keyPath}"
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if ! test -f ${cfg.selector}.private; then
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${pkgs.opendkim}/bin/opendkim-genkey -s ${cfg.selector} -d all-domains-generic-key
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echo "Generated OpenDKIM key! Please update your DNS settings:\n"
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echo "-------------------------------------------------------------"
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cat ${cfg.selector}.txt
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echo "-------------------------------------------------------------"
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fi
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chown ${cfg.user}:${cfg.group} ${cfg.selector}.private
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'';
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serviceConfig = {
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ExecStart = "${pkgs.opendkim}/bin/opendkim ${escapeShellArgs args}";
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User = cfg.user;
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Group = cfg.group;
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RuntimeDirectory = optional (cfg.socket == defaultSock) "opendkim";
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PermissionsStartOnly = true;
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};
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};
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};
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}
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