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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.stalwart-mail;
configFormat = pkgs.formats.toml { };
configFile = configFormat.generate "stalwart-mail.toml" cfg.settings;
dataDir = "/var/lib/stalwart-mail";
in {
options.services.stalwart-mail = {
enable = mkEnableOption (mdDoc "the Stalwart all-in-one email server");
package = mkPackageOptionMD pkgs "stalwart-mail" { };
settings = mkOption {
inherit (configFormat) type;
default = { };
description = mdDoc ''
Configuration options for the Stalwart email server.
See <https://stalw.art/docs/> for available options.
By default, the module is configured to store everything locally.
'';
};
};
config = mkIf cfg.enable {
# Default config: all local
services.stalwart-mail.settings = {
global.tracing.method = mkDefault "stdout";
global.tracing.level = mkDefault "info";
queue.path = mkDefault "${dataDir}/queue";
report.path = mkDefault "${dataDir}/reports";
store.db.path = mkDefault "${dataDir}/data/index.sqlite3";
store.blob.type = mkDefault "local";
store.blob.local.path = mkDefault "${dataDir}/data/blobs";
resolver.type = mkDefault "system";
};
systemd.services.stalwart-mail = {
wantedBy = [ "multi-user.target" ];
after = [ "local-fs.target" "network.target" ];
preStart = ''
mkdir -p ${dataDir}/{queue,reports,data/blobs}
'';
serviceConfig = {
ExecStart =
"${cfg.package}/bin/stalwart-mail --config=${configFile}";
# Base from template resources/systemd/stalwart-mail.service
Type = "simple";
LimitNOFILE = 65536;
KillMode = "process";
KillSignal = "SIGINT";
Restart = "on-failure";
RestartSec = 5;
StandardOutput = "syslog";
StandardError = "syslog";
SyslogIdentifier = "stalwart-mail";
DynamicUser = true;
User = "stalwart-mail";
StateDirectory = "stalwart-mail";
# Bind standard privileged ports
AmbientCapabilities = [ "CAP_NET_BIND_SERVICE" ];
CapabilityBoundingSet = [ "CAP_NET_BIND_SERVICE" ];
# Hardening
DeviceAllow = [ "" ];
LockPersonality = true;
MemoryDenyWriteExecute = true;
PrivateDevices = true;
PrivateUsers = false; # incompatible with CAP_NET_BIND_SERVICE
ProcSubset = "pid";
PrivateTmp = true;
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProtectSystem = "strict";
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = [ "@system-service" "~@privileged" ];
UMask = "0077";
};
};
# Make admin commands available in the shell
environment.systemPackages = [ cfg.package ];
};
meta = {
maintainers = with maintainers; [ happysalada pacien ];
};
}
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