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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.tang;
in
{
options.services.tang = {
enable = mkEnableOption "tang";
package = mkOption {
type = types.package;
default = pkgs.tang;
defaultText = literalExpression "pkgs.tang";
description = mdDoc "The tang package to use.";
};
listenStream = mkOption {
type = with types; listOf str;
default = [ "7654" ];
example = [ "198.168.100.1:7654" "[2001:db8::1]:7654" "7654" ];
description = mdDoc ''
Addresses and/or ports on which tang should listen.
For detailed syntax see ListenStream in {manpage}`systemd.socket(5)`.
'';
};
ipAddressAllow = mkOption {
example = [ "192.168.1.0/24" ];
type = types.listOf types.str;
description = ''
Whitelist a list of address prefixes.
Preferably, internal addresses should be used.
'';
};
};
config = mkIf cfg.enable {
environment.systemPackages = [ cfg.package ];
systemd.services."tangd@" = {
description = "Tang server";
path = [ cfg.package ];
serviceConfig = {
StandardInput = "socket";
StandardOutput = "socket";
StandardError = "journal";
DynamicUser = true;
StateDirectory = "tang";
RuntimeDirectory = "tang";
StateDirectoryMode = "700";
UMask = "0077";
CapabilityBoundingSet = [ "" ];
ExecStart = "${cfg.package}/libexec/tangd %S/tang";
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
DeviceAllow = [ "/dev/stdin" ];
RestrictAddressFamilies = [ "AF_UNIX" ];
DevicePolicy = "strict";
PrivateDevices = true;
PrivateTmp = true;
PrivateUsers = true;
ProcSubset = "pid";
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProtectSystem = "strict";
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = [ "@system-service" "~@privileged" "~@resources" ];
IPAddressDeny = "any";
IPAddressAllow = cfg.ipAddressAllow;
};
};
systemd.sockets.tangd = {
description = "Tang server";
wantedBy = [ "sockets.target" ];
socketConfig = {
ListenStream = cfg.listenStream;
Accept = "yes";
IPAddressDeny = "any";
IPAddressAllow = cfg.ipAddressAllow;
};
};
};
meta.maintainers = with lib.maintainers; [ jfroche julienmalka ];
}
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