119 lines
3.3 KiB
Nix
119 lines
3.3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.dkimproxy-out;
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keydir = "/var/lib/dkimproxy-out";
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privkey = "${keydir}/private.key";
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pubkey = "${keydir}/public.key";
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in
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{
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##### interface
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options = {
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services.dkimproxy-out = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description =
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''
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Whether to enable dkimproxy_out.
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Note that a key will be auto-generated, and can be found in
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${keydir}.
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'';
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};
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listen = mkOption {
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type = types.str;
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example = "127.0.0.1:10027";
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description = "Address:port DKIMproxy should listen on.";
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};
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relay = mkOption {
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type = types.str;
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example = "127.0.0.1:10028";
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description = "Address:port DKIMproxy should forward mail to.";
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};
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domains = mkOption {
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type = with types; listOf str;
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example = [ "example.org" "example.com" ];
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description = "List of domains DKIMproxy can sign for.";
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};
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selector = mkOption {
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type = types.str;
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example = "selector1";
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description =
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''
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The selector to use for DKIM key identification.
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For example, if 'selector1' is used here, then for each domain
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'example.org' given in `domain`, 'selector1._domainkey.example.org'
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should contain the TXT record indicating the public key is the one
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in ${pubkey}: "v=DKIM1; t=s; p=[THE PUBLIC KEY]".
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'';
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};
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keySize = mkOption {
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type = types.int;
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default = 2048;
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description =
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''
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Size of the RSA key to use to sign outgoing emails. Note that the
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maximum mandatorily verified as per RFC6376 is 2048.
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'';
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};
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# TODO: allow signature for other schemes than dkim(c=relaxed/relaxed)?
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# This being the scheme used by gmail, maybe nothing more is needed for
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# reasonable use.
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};
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};
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##### implementation
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config = let
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configfile = pkgs.writeText "dkimproxy_out.conf"
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''
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listen ${cfg.listen}
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relay ${cfg.relay}
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domain ${concatStringsSep "," cfg.domains}
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selector ${cfg.selector}
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signature dkim(c=relaxed/relaxed)
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keyfile ${privkey}
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'';
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in
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mkIf cfg.enable {
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users.groups.dkimproxy-out = {};
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users.users.dkimproxy-out = {
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description = "DKIMproxy_out daemon";
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group = "dkimproxy-out";
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isSystemUser = true;
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};
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systemd.services.dkimproxy-out = {
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description = "DKIMproxy_out";
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wantedBy = [ "multi-user.target" ];
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preStart = ''
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if [ ! -d "${keydir}" ]; then
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mkdir -p "${keydir}"
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chmod 0700 "${keydir}"
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${pkgs.openssl}/bin/openssl genrsa -out "${privkey}" ${toString cfg.keySize}
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${pkgs.openssl}/bin/openssl rsa -in "${privkey}" -pubout -out "${pubkey}"
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chown -R dkimproxy-out:dkimproxy-out "${keydir}"
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fi
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'';
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script = ''
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exec ${pkgs.dkimproxy}/bin/dkimproxy.out --conf_file=${configfile}
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'';
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serviceConfig = {
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User = "dkimproxy-out";
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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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