nixos-config/machines/fuuko/services/router.nix

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# Home network configuration
#
# +----------+ +------+
# | | | | ( clients )
# | | | +|-|-|-|-|+
# +---+----+ +-+-+-+ |5 4 3 2 1|
# |upstream| |fuuko| |TL-SG105 |
# +--------+ +-----+ +---------+
#
# It consists of fuuko as a router (this configuration),
# connected to a TP-LINK TL-SG105E “smart managed” (i.e., it can do VLANs) 5-port switch.
# The upstream comes from some plasic Huawei router/AP I dont control.
#
# fuuko has two physical network interfaces,
# because remote unlocking (which requires network in initrd) is hard with VLANs.
#
# Wireless is configured by providing the whole hostapd configuration file as a secret.
# Once nixpkgs PR 222536 is merged, I will migrate to using the NixOS module.
# Thanks to Intels wisdom, its not possible to use 5GHz in AP mode.
{ config, lib, pkgs, ... }:
let
domain = "home.sbruder.de";
in
{
sops.secrets.wg-mullvad-private-key = {
owner = config.users.users.systemd-network.name;
sopsFile = ../secrets.yaml;
};
sops.secrets.hostapd-config = {
sopsFile = ../secrets.yaml;
};
boot.kernel.sysctl = {
"net.ipv4.conf.all.forwarding" = true;
};
networking = {
# networkd handles this
useDHCP = false;
# networkd didnt work that well for this
nat = {
enable = true;
enableIPv6 = true;
externalInterface = "wg-mullvad";
internalInterfaces = [ "br-lan" ];
internalIPv6s = [ "fd00:80:1::/64" ];
};
};
systemd.network = {
enable = true;
netdevs = {
br-lan = {
netdevConfig = {
Name = "br-lan";
Kind = "bridge";
};
};
wg-mullvad = {
netdevConfig = {
Kind = "wireguard";
Name = "wg-mullvad";
};
wireguardConfig = {
PrivateKeyFile = config.sops.secrets.wg-mullvad-private-key.path;
FirewallMark = 51820;
};
wireguardPeers = lib.singleton {
wireguardPeerConfig = {
Endpoint = "185.65.134.86:51820";
PublicKey = "xpZ3ZDEukbqKQvdHwaqKMUhsYhcYD3uLPUh1ACsVr1s=";
AllowedIPs = [ "0.0.0.0/0" "::0/0" ];
PersistentKeepalive = 25;
};
};
};
};
networks = {
wan = {
name = "enp8s0";
networkConfig = {
# Upstream provides no IPv6 :(
# If this is not set, it waits and fails systemd-networkd-wait-online
LinkLocalAddressing = "no";
IPv6AcceptRA = "no";
};
DHCP = "ipv4";
dhcpV4Config = {
UseDNS = "no";
};
};
lan = {
name = "enp9s0";
bridge = [ "br-lan" ];
};
br-lan = {
name = "br-lan";
domains = [ domain ];
address = [ "10.80.1.1/24" "fd00:80:1::1/64" ];
};
wg-mullvad = {
name = "wg-mullvad";
address = [ "10.66.208.88/32" "fc00:bbbb:bbbb:bb01::3:d057/128" ];
dns = [ "10.64.0.1" ];
routingPolicyRules = [
{
routingPolicyRuleConfig = {
FirewallMark = 51820;
InvertRule = "yes";
Table = 51820;
Priority = 10;
#SuppressPrefixLength = 0; # cant be used here (forwarding does not work with it)
};
}
# FIXME: those two shouldnt be necessary
# It should automatically detect those routes existing and prioritise them
{
routingPolicyRuleConfig = {
To = "10.80.0.0/24";
Priority = 9;
};
}
{
routingPolicyRuleConfig = {
To = "10.80.1.0/24";
Priority = 9;
};
}
];
routes = [
{
routeConfig = {
Gateway = "0.0.0.0"; # point-to-point connection
Table = 51820;
};
}
{
routeConfig = {
Gateway = "::";
};
}
];
};
};
};
services.resolved.enable = false;
services.dnsmasq = {
enable = true;
settings = {
bogus-priv = true; # do not forward revese lookups of internal addresses
domain-needed = true; # do not forward names without domain
interface = "br-lan"; # only respond to queries from lan
no-hosts = true; # do not resolve hosts from /etc/hosts
no-resolv = true; # only use explicitly configured resolvers
cache-size = 10000;
inherit domain;
# Allow resolving the router
interface-name = [
"${config.networking.hostName}.${domain},br-lan"
"${config.networking.hostName},br-lan"
];
# DHCPv4
dhcp-range = [
"10.80.1.20,10.80.1.150,12h" # DHCPv4
"fd00:80:1::,ra-stateless,ra-names" # SLAAC (for addresses) / DHCPv6 (for DNS)
];
dhcp-option = [
"option:router,10.80.1.1"
"option6:dns-server,fd00:80:1::1"
];
# Despite its name, the switch does not have a “smart” configuration,
# that would allow me to tell it not to get DHCP from wan,
# but from lan instead.
# So it has to use static configuration.
host-record = "switchviech,switchviech.${domain},10.80.1.19";
server = [
"10.64.0.1" # mullvad DNS, should be fastest overall
#"9.9.9.9" # dns.quad9.net
#"2620:fe::fe"
];
};
};
systemd.services.dnsmasq.after = [ "systemd-networkd.service" ];
services.prometheus.exporters.dnsmasq = {
enable = true;
listenAddress = config.sbruder.wireguard.home.address;
leasesPath = "/var/lib/dnsmasq/dnsmasq.leases";
};
networking.firewall.allowedUDPPorts = [ 53 67 ];
networking.firewall.allowedTCPPorts = [ 53 ];
# Wireless
boot.kernelModules = [ "nl80211" ];
environment.systemPackages = with pkgs; [
iw
wirelesstools
];
# The service is mostly taken from nixpkgs pr 222536.
systemd.services.hostapd = {
path = with pkgs; [ hostapd ];
after = [ "sys-subsystem-net-devices-wlp7s0.device" ];
bindsTo = [ "sys-subsystem-net-devices-wlp7s0.device" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
ExecStart = "${pkgs.hostapd}/bin/hostapd ${config.sops.secrets.hostapd-config.path}";
Restart = "always";
ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
RuntimeDirectory = "hostapd";
# Hardening
LockPersonality = true;
MemoryDenyWriteExecute = true;
DevicePolicy = "closed";
DeviceAllow = "/dev/rfkill rw";
NoNewPrivileges = true;
PrivateUsers = false; # hostapd requires true root access.
PrivateTmp = true;
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProcSubset = "pid";
ProtectSystem = "strict";
RestrictAddressFamilies = [
"AF_INET"
"AF_INET6"
"AF_NETLINK"
"AF_UNIX"
];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = [
"@system-service"
"~@privileged"
"@chown"
];
UMask = "0077";
};
};
}