217 lines
5.8 KiB
Nix
217 lines
5.8 KiB
Nix
{ config, pkgs, lib, ... }:
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let
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address4 = "172.22.99.253";
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address6 = "fe80::deca:fbad";
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inherit (pkgs) neighbors;
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in {
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networking = {
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domain = "hq.c3d2.de";
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hostName = "dn42";
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useNetworkd = true;
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# No Firewalling!
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firewall.enable = false;
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};
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services.resolved.enable = false;
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c3d2 = {
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hq = {
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interface = "c3d2";
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statistics.enable = true;
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};
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deployment.server = "server10";
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};
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services.collectd.plugins.exec =
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let
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routecount = pkgs.writeScript "run-routecount" ''
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#!${pkgs.bash}/bin/bash
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export PATH=${lib.makeBinPath (with pkgs; [ ruby iproute ] )}
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ruby ${./routecount.rb}
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'';
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in ''
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Exec "collectd" "${routecount}"
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'';
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sops = {
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age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
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defaultSopsFile = ./secrets.yaml;
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secrets = builtins.foldl' (result: name:
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let
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conf = neighbors.${name};
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in result // (
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if conf ? openvpn
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then { "neighbors/${name}/openvpn/key" = {}; }
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else if conf ? wireguard
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then { "neighbors/${name}/wireguard/privateKey" = {}; }
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else {}
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)
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) {} (builtins.attrNames neighbors);
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};
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boot.kernel.sysctl = {
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"net.ipv4.conf.all.forwarding" = true;
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"net.ipv4.conf.default.forwarding" = true;
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"net.ipv6.conf.all.forwarding" = true;
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"net.ipv6.conf.default.forwarding" = true;
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};
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boot.postBootCommands = ''
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if [ ! -c /dev/net/tun ]; then
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mkdir -p /dev/net
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mknod -m 666 /dev/net/tun c 10 200
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fi
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'';
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services.openvpn = let
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openvpnNeighbors = lib.filterAttrs (_: conf: conf ? openvpn) neighbors;
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mkServer = name: conf: {
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config = ''
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dev ${name}
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dev-type tun
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ifconfig ${address4} ${conf.address4}
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user nobody
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group nogroup
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persist-tun
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persist-key
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ping 30
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ping-restart 45
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verb 1
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${conf.openvpn}
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secret ${config.sops.secrets."neighbors/${name}/openvpn/key".path}
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'';
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up = ''
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${pkgs.iproute}/bin/ip addr flush dev $1
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${pkgs.iproute}/bin/ip addr add ${address4} dev ${name} peer ${conf.address4}/32
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${pkgs.iproute}/bin/ip addr add ${address6}/64 dev $1
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'';
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};
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in {
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servers =
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builtins.mapAttrs mkServer openvpnNeighbors;
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};
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networking.wireguard = {
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enable = true;
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interfaces = let
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wireguardNeighbors =
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lib.filterAttrs (_: conf: conf ? wireguard) neighbors;
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in builtins.mapAttrs (name: conf: {
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inherit (conf.wireguard) listenPort;
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privateKeyFile = config.sops.secrets."neighbors/${name}/wireguard/privateKey".path;
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ips = [ "${address4}/32" "${address6}/64" ];
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allowedIPsAsRoutes = false;
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postSetup = ''
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${pkgs.iproute}/bin/ip addr del ${address4}/32 dev ${name}
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${pkgs.iproute}/bin/ip addr add ${address4} dev ${name}${if conf ? address4 then " peer ${conf.address4}/32" else ""}
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'';
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peers = [
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({
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inherit (conf.wireguard) publicKey;
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allowedIPs = [ "0.0.0.0/0" "::0/0" ];
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persistentKeepalive = 30;
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} // (lib.optionalAttrs (conf.wireguard ? endpoint) {
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inherit (conf.wireguard) endpoint;
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}))
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];
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}) wireguardNeighbors;
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};
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services.bird2 = {
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enable = true;
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config = let
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bgpNeighbors = builtins.concatStringsSep "\n" (builtins.attrValues
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(builtins.mapAttrs (name: conf@{ multiprotocol ? false, ... }:
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let
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neighbor4 = if conf ? address4 && multiprotocol != "ipv6" then ''
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protocol bgp ${name}_4 from dnpeers {
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neighbor ${conf.address4} as ${builtins.toString conf.asn};
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}
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'' else
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"";
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neighbor6 = if conf ? address6 && multiprotocol != "ipv4" then ''
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protocol bgp ${name}_6 from dnpeers {
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neighbor ${conf.address6}%${interface} as ${
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builtins.toString conf.asn
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};
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}
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'' else
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"";
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interface = conf.interface or name;
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in "${neighbor4}${neighbor6}") neighbors));
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in ''
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protocol kernel {
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ipv4 {
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export all;
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};
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}
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protocol kernel {
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ipv6 {
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export all;
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};
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}
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protocol device {
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scan time 10;
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}
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protocol static {
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ipv4;
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route 10.0.0.0/8 unreachable;
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route 172.16.0.0/12 unreachable;
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route 192.168.0.0/16 unreachable;
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}
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protocol static {
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ipv6;
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route 2000::/3 via 2a00:8180:2c00:281::c3d2:3;
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route fd00::/8 unreachable;
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}
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protocol static hq4 {
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ipv4;
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route 172.22.99.0/24 via "c3d2";
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}
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protocol static hq6 {
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ipv6;
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route fd23:42:c3d2:500::/56 unreachable;
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}
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template bgp dnpeers {
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local as 64699;
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ipv4 {
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import filter {
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if proto = "hq4" then reject;
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accept;
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};
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export filter {
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if source = RTS_BGP then accept;
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if proto = "hq4" then accept;
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reject;
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};
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};
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ipv6 {
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import filter {
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if proto = "hq6" then reject;
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accept;
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};
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export filter {
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if source = RTS_BGP then accept;
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if proto = "hq6" then accept;
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reject;
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};
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};
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}
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${bgpNeighbors}
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router id ${address4};
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'';
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};
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# This value determines the NixOS release with which your system is to be
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# compatible, in order to avoid breaking some software such as database
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# servers. You should change this only after NixOS release notes say you
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# should.
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system.stateVersion = "19.09"; # Did you read the comment?
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}
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