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