{ config, lib, pkgs, ... }: with lib; let cfg = config.services.postgrey; natural = with types; addCheck int (x: x >= 0); natural' = with types; addCheck int (x: x > 0); socket = with types; addCheck (either (submodule unixSocket) (submodule inetSocket)) (x: x ? "path" || x ? "port"); inetSocket = with types; { options = { addr = mkOption { type = nullOr string; default = null; example = "127.0.0.1"; description = "The address to bind to. Localhost if null"; }; port = mkOption { type = natural'; default = 10030; description = "Tcp port to bind to"; }; }; }; unixSocket = with types; { options = { path = mkOption { type = path; default = "/var/run/postgrey.sock"; description = "Path of the unix socket"; }; mode = mkOption { type = string; default = "0777"; description = "Mode of the unix socket"; }; }; }; in { options = { services.postgrey = with types; { enable = mkOption { type = bool; default = false; description = "Whether to run the Postgrey daemon"; }; socket = mkOption { type = socket; default = { path = "/var/run/postgrey.sock"; }; example = { addr = "127.0.0.1"; port = 10030; }; description = "Socket to bind to"; }; greylistText = mkOption { type = string; default = "Greylisted for %%s seconds"; description = "Response status text for greylisted messages; use %%s for seconds left until greylisting is over and %%r for mail domain of recipient"; }; greylistAction = mkOption { type = string; default = "DEFER_IF_PERMIT"; description = "Response status for greylisted messages (see access(5))"; }; greylistHeader = mkOption { type = string; default = "X-Greylist: delayed %%t seconds by postgrey-%%v at %%h; %%d"; description = "Prepend header to greylisted mails; use %%t for seconds delayed due to greylisting, %%v for the version of postgrey, %%d for the date, and %%h for the host"; }; delay = mkOption { type = natural; default = 300; description = "Greylist for N seconds"; }; maxAge = mkOption { type = natural; default = 35; description = "Delete entries from whitelist if they haven't been seen for N days"; }; retryWindow = mkOption { type = either string natural; default = 2; example = "12h"; description = "Allow N days for the first retry. Use string with appended 'h' to specify time in hours"; }; lookupBySubnet = mkOption { type = bool; default = true; description = "Strip the last N bits from IP addresses, determined by IPv4CIDR and IPv6CIDR"; }; IPv4CIDR = mkOption { type = natural; default = 24; description = "Strip N bits from IPv4 addresses if lookupBySubnet is true"; }; IPv6CIDR = mkOption { type = natural; default = 64; description = "Strip N bits from IPv6 addresses if lookupBySubnet is true"; }; privacy = mkOption { type = bool; default = true; description = "Store data using one-way hash functions (SHA1)"; }; autoWhitelist = mkOption { type = nullOr natural'; default = 5; description = "Whitelist clients after successful delivery of N messages"; }; }; }; config = mkIf cfg.enable { environment.systemPackages = [ pkgs.postgrey ]; users = { extraUsers = { postgrey = { description = "Postgrey Daemon"; uid = config.ids.uids.postgrey; group = "postgrey"; }; }; extraGroups = { postgrey = { gid = config.ids.gids.postgrey; }; }; }; systemd.services.postgrey = let bind-flag = if cfg.socket ? "path" then ''--unix=${cfg.socket.path} --socketmode=${cfg.socket.mode}'' else ''--inet=${optionalString (cfg.socket.addr != null) (cfg.socket.addr + ":")}${cfg.socket.port}''; in { description = "Postfix Greylisting Service"; wantedBy = [ "multi-user.target" ]; before = [ "postfix.service" ]; preStart = '' mkdir -p /var/postgrey chown postgrey:postgrey /var/postgrey chmod 0770 /var/postgrey ''; serviceConfig = { Type = "simple"; ExecStart = ''${pkgs.postgrey}/bin/postgrey ${bind-flag} --group=postgrey --user=postgrey --dbdir=/var/postgrey --delay=${cfg.delay} --max-age=${cfg.maxAge} --retry-window=${cfg.retryWindow} ${if cfg.lookupBySubnet then "--lookup-by-subnet" else "--lookup-by-host"} --ipv4cidr=${cfg.IPv4CIDR} --ipv6cidr=${cfg.IPv6CIDR} ${optionalString cfg.privacy "--privacy"} --auto-whitelist-clients=${if cfg.autoWhitelist == null then "0" else cfg.autoWhitelist} --greylist-text="${cfg.greylistText}" --x-greylist-header="${cfg.greylistHeader}" --greylist-action=${cfg.greylistAction}''; Restart = "always"; RestartSec = 5; TimeoutSec = 10; }; }; }; }