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{ config, lib, pkgs, ... }: with import <stockholm/lib>; let
cfg = config.krebs.exim;
in {
options.krebs.exim = {
enable = mkEnableOption "krebs.exim";
config = mkOption {
type = types.str;
default = "";
description = ''
Verbatim Exim configuration. This should not contain exim_user,
exim_group, exim_path, or spool_directory.
'';
};
user = mkOption {
type = types.user;
default = {
name = "exim";
home = "/var/spool/exim";
};
description = ''
User to use when no root privileges are required.
In particular, this applies when receiving messages and when doing
remote deliveries. (Local deliveries run as various non-root users,
typically as the owner of a local mailbox.) Specifying this value
as root is not supported.
'';
};
group = mkOption {
type = types.group;
default = {
name = "exim";
};
description = ''
Group to use when no root privileges are required.
'';
};
};
config = lib.mkIf cfg.enable {
environment = {
etc."exim.conf".source = pkgs.writeEximConfig "exim.conf" /* exim */ ''
exim_user = ${cfg.user.name}
exim_group = ${cfg.group.name}
exim_path = /run/wrappers/bin/exim
spool_directory = ${cfg.user.home}
# https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html
chunking_advertise_hosts =
${cfg.config}
'';
systemPackages = [ pkgs.exim ];
};
krebs.setuid = {
exim = {
filename = "${pkgs.exim}/bin/exim";
mode = "4111";
};
sendmail = {
filename = "${pkgs.exim}/bin/exim";
mode = "4111";
};
};
systemd.services.exim = {
restartTriggers = [
config.environment.etc."exim.conf".source
];
serviceConfig = {
ExecStart = "${pkgs.exim}/bin/exim -bdf -q30m";
ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
};
wantedBy = [ "multi-user.target" ];
};
users = {
groups.${cfg.group.name} = {
inherit (cfg.group) name gid;
};
users.${cfg.user.name} = {
inherit (cfg.user) home name uid;
createHome = true;
group = cfg.group.name;
};
};
};
}
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