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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";
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 "${cfgPkg}/config.toml").include.files;
settingsDefault = recursiveUpdateList (map (path: readTOML path) cfgFiles);
in {
options.services.stalwart-mail = {
enable = mkEnableOption (mdDoc "the Stalwart all-in-one email server");
package = mkPackageOption pkgs "stalwart-mail" { };
loadCredential = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [];
example = [ "dkim.private:/path/to/stalwart.private" ];
description = lib.mdDoc ''
This can be used to pass secrets to the systemd service without adding them to
the nix store.
See the LoadCredential section of systemd.exec manual for more information.
'';
};
settings = mkOption {
inherit (configFormat) type;
default = { };
description = mdDoc ''
Configuration options for the Stalwart email server.
See <https://stalw.art/docs/category/configuration> for available options.
By default, the module is configured to store everything locally.
'';
};
};
config = mkIf cfg.enable {
# set the default upstream settings
# assumptions
# 1. ./config.toml exists and only containts include.files and macros
# 2. no other files containts include.files
services.stalwart-mail.settings = mkOptionDefaultRec
(lib.attrsets.recursiveUpdate settingsDefault {
macros.base_path = dataDir;
server.run-as.user = {};
server.run-as.group = {};
global.tracing.method = "stdout";
# outliers as of v0.6.0
acme."letsencrypt".cache = "${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 ];
};
meta = {
maintainers = with maintainers; [ happysalada pacien ];
};
}
|
