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-rw-r--r--krebs/3modules/exim.nix80
1 files changed, 80 insertions, 0 deletions
diff --git a/krebs/3modules/exim.nix b/krebs/3modules/exim.nix
new file mode 100644
index 000000000..7b18c72c1
--- /dev/null
+++ b/krebs/3modules/exim.nix
@@ -0,0 +1,80 @@
+{ config, lib, pkgs, ... }: with config.krebs.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_user = ${cfg.user.name}
+ exim_group = ${cfg.group.name}
+ exim_path = /var/setuid-wrappers/exim
+ spool_directory = ${cfg.user.home}
+ ${cfg.config}
+ '';
+ systemPackages = [ pkgs.exim ];
+ };
+ krebs.setuid = {
+ exim = {
+ filename = "${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;
+ };
+ };
+ };
+}