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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.tayga;
# Converts an address set to a string
strAddr = addr: "${addr.address}/${toString addr.prefixLength}";
configFile = pkgs.writeText "tayga.conf" ''
tun-device ${cfg.tunDevice}
ipv4-addr ${cfg.ipv4.address}
${optionalString (cfg.ipv6.address != null) "ipv6-addr ${cfg.ipv6.address}"}
prefix ${strAddr cfg.ipv6.pool}
dynamic-pool ${strAddr cfg.ipv4.pool}
data-dir ${cfg.dataDir}
'';
addrOpts = v:
assert v == 4 || v == 6;
{
options = {
address = mkOption {
type = types.str;
description = "IPv${toString v} address.";
};
prefixLength = mkOption {
type = types.addCheck types.int (n: n >= 0 && n <= (if v == 4 then 32 else 128));
description = ''
Subnet mask of the interface, specified as the number of
bits in the prefix ("${if v == 4 then "24" else "64"}").
'';
};
};
};
versionOpts = v: {
options = {
router = {
address = mkOption {
type = types.str;
description = "The IPv${toString v} address of the router.";
};
};
address = mkOption {
type = types.nullOr types.str;
default = null;
description = "The source IPv${toString v} address of the TAYGA server.";
};
pool = mkOption {
type = with types; nullOr (submodule (addrOpts v));
description = "The pool of IPv${toString v} addresses which are used for translation.";
};
};
};
in
{
options = {
services.tayga = {
enable = mkEnableOption "Tayga";
package = mkPackageOption pkgs "tayga" { };
ipv4 = mkOption {
type = types.submodule (versionOpts 4);
description = "IPv4-specific configuration.";
example = literalExpression ''
{
address = "192.0.2.0";
router = {
address = "192.0.2.1";
};
pool = {
address = "192.0.2.1";
prefixLength = 24;
};
}
'';
};
ipv6 = mkOption {
type = types.submodule (versionOpts 6);
description = "IPv6-specific configuration.";
example = literalExpression ''
{
address = "2001:db8::1";
router = {
address = "64:ff9b::1";
};
pool = {
address = "64:ff9b::";
prefixLength = 96;
};
}
'';
};
dataDir = mkOption {
type = types.path;
default = "/var/lib/tayga";
description = "Directory for persistent data";
};
tunDevice = mkOption {
type = types.str;
default = "nat64";
description = "Name of the nat64 tun device";
};
};
};
config = mkIf cfg.enable {
networking.interfaces."${cfg.tunDevice}" = {
virtual = true;
virtualType = "tun";
virtualOwner = mkIf config.networking.useNetworkd "";
ipv4 = {
addresses = [
{ address = cfg.ipv4.router.address; prefixLength = 32; }
];
routes = [
cfg.ipv4.pool
];
};
ipv6 = {
addresses = [
{ address = cfg.ipv6.router.address; prefixLength = 128; }
];
routes = [
cfg.ipv6.pool
];
};
};
systemd.services.tayga = {
description = "Stateless NAT64 implementation";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = {
ExecStart = "${cfg.package}/bin/tayga -d --nodetach --config ${configFile}";
ExecReload = "${pkgs.coreutils}/bin/kill -SIGHUP $MAINPID";
Restart = "always";
# Hardening Score:
# - nixos-scripts: 2.1
# - systemd-networkd: 1.6
ProtectHome = true;
SystemCallFilter = [
"@network-io"
"@system-service"
"~@privileged"
"~@resources"
];
ProtectKernelLogs = true;
AmbientCapabilities = [
"CAP_NET_ADMIN"
];
CapabilityBoundingSet = "";
RestrictAddressFamilies = [
"AF_INET"
"AF_INET6"
"AF_NETLINK"
];
StateDirectory = "tayga";
DynamicUser = mkIf config.networking.useNetworkd true;
MemoryDenyWriteExecute = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
ProtectHostname = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
RestrictNamespaces = true;
NoNewPrivileges = true;
ProtectControlGroups = true;
SystemCallArchitectures = "native";
PrivateTmp = true;
LockPersonality = true;
ProtectSystem = true;
PrivateUsers = true;
ProtectProc = "invisible";
};
};
};
}
|
