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|
{ config, lib, pkgs, ... }: let
cfg = config.services.stalwart-mail;
configFormat = pkgs.formats.toml { };
configFile = configFormat.generate "stalwart-mail.toml" cfg.settings;
dataDir = "/var/lib/stalwart-mail";
readTOML =
path:
builtins.fromTOML (builtins.unsafeDiscardStringContext (lib.readFile path));
recursiveUpdateList =
attrList:
lib.lists.foldr (a1: a2: lib.attrsets.recursiveUpdate a1 a2) {} attrList;
mkOverrideRec =
priority:
content:
if lib.isAttrs content then
lib.mapAttrs (_: v: mkOverrideRec priority v) content
else
lib.mkOverride priority content;
mkOptionDefaultRec = mkOverrideRec 1500;
cfgPkg = pkgs.callPackage ../pkgs/stalwart-mail-config.nix {};
cfgFiles = (readTOML "${cfgPkg}/config.toml").include.files;
settingsDefault = recursiveUpdateList (map (path: readTOML path) cfgFiles);
in {
options.services.stalwart-mail = {
enable = lib.mkEnableOption "the Stalwart all-in-one email server";
package = lib.mkPackageOption pkgs "stalwart-mail" { };
loadCredential = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [];
example = [ "dkim.private:/path/to/stalwart.private" ];
description = ''
This can be used to pass secrets to the systemd service without adding them to
the nix store.
See the LoadCredential section of systemd.exec manual for more information.
'';
};
settings = lib.mkOption {
inherit (configFormat) type;
default = { };
description = ''
Configuration options for the Stalwart email server.
See <https://stalw.art/docs/category/configuration> for available options.
By default, the module is configured to store everything locally.
'';
};
};
config = lib.mkIf cfg.enable {
# set the default upstream settings
# assumptions
# 1. ./config.toml exists and only containts include.files and macros
# 2. no other files containts include.files
services.stalwart-mail.settings = mkOptionDefaultRec
(lib.attrsets.recursiveUpdate settingsDefault {
macros.base_path = dataDir;
server.run-as.user = {};
server.run-as.group = {};
global.tracing.method = "stdout";
# outliers as of v0.6.0
acme."letsencrypt".cache = "${cfg.settings.macros.base_path}/acme";
});
assertions = let
m = cfg.settings.macros;
mkMacroMessage =
opt:
"config.stalwart-mail.settings.macros.${opt} can not be empty";
in [
{
assertion = m ? host
&& m.host != ""
&& m.host != null;
message = mkMacroMessage "host";
}
{
assertion = m ? default_domain
&& m.default_domain != ""
&& m.default_domain != null;
message = mkMacroMessage "default_domain";
}
{
assertion = m ? default_directory
&& m.default_directory != ""
&& m.default_directory != null;
message = mkMacroMessage "default_directory";
}
{
assertion = m ? default_store &&
m.default_store != ""
&& m.default_store != null;
message = mkMacroMessage "default_store";
}
];
systemd.services.stalwart-mail = {
wantedBy = [ "multi-user.target" ];
after = [ "local-fs.target" "network.target" ];
serviceConfig = {
ExecStart =
"${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 = "journal";
StandardError = "journal";
SyslogIdentifier = "stalwart-mail";
DynamicUser = true;
User = "stalwart-mail";
StateDirectory = "stalwart-mail";
LoadCredential = cfg.loadCredential;
# 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 cfgPkg ];
};
meta = {
maintainers = with lib.maintainers; [ happysalada pacien ];
};
}
|
