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https://git.sr.ht/~magic_rb/dotfiles
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283 lines
10 KiB
Nix
283 lines
10 KiB
Nix
{ pkgs, config, lib, ... }:
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with lib;
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let
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lan = "enp7s0f0";
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wan = "enp7s0f1";
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doVPN = "do_vpn0";
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nomad = mapAttrs (const toString) {
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inherit (config.services.hashicorp.nomad.settings.client)
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min_dynamic_port
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max_dynamic_port;
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};
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in
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{
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boot.kernel.sysctl = {
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# Enable forwarding on IPv4 but disable on IPv6
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"net.ipv4.conf.all.forwarding" = true;
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"net.ipv6.conf.all.forwarding" = false;
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# source: https://github.com/mdlayher/homelab/blob/master/nixos/routnerr-2/configuration.nix#L52
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# By default, not automatically configure any IPv6 addresses.
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"net.ipv6.conf.all.accept_ra" = 0;
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"net.ipv6.conf.all.autoconf" = 0;
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"net.ipv6.conf.all.use_tempaddr" = 0;
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# On WAN, allow IPv6 autoconfiguration and tempory address use.
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# "net.ipv6.conf.${name}.accept_ra" = 2;
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# "net.ipv6.conf.${name}.autoconf" = 1;
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};
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services.stubby = {
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enable = true;
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settings = {
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resolution_type = "GETDNS_RESOLUTION_STUB";
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dns_transport_list = [
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"GETDNS_TRANSPORT_TLS"
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];
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tls_authentication = "GETDNS_AUTHENTICATION_REQUIRED";
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tls_query_padding_blocksize = 256;
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edns_client_subnet_private = 1;
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idle_timeout = 10000;
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listen_addresses = [
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"127.0.0.1@5353"
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];
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dnssec_return_status = "GETDNS_EXTENSION_TRUE";
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appdata_dir = "/var/cache/stubby";
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round_robin_upstreams = 1;
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upstream_recursive_servers = [
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{
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address_data = "208.67.220.220";
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tls_auth_name = "dns.opendns.com";
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}
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{
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address_data = "208.67.222.222";
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tls_auth_name = "dns.opendns.com";
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# tls_pubkey_pinset = {
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# digest = "sha384";
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# value = "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEfYvXHQOFDRglszQcKaEn1KwBJUiKoPHqArnYUSwIaqxyVuz6Paagn0kJVY6s/rlzF1wC+3jMJJGUb0MjiQ4dZg==";
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# };
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}
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];
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};
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};
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services.dhcpd4 = {
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enable = true;
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interfaces = [ "${lan}" ];
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extraConfig = ''
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option domain-name-servers 10.64.2.1;
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option subnet-mask 255.255.255.0;
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subnet 10.64.2.0 netmask 255.255.255.0 {
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option broadcast-address 10.64.2.255;
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option routers 10.64.2.1;
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interface ${lan};
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range 10.64.2.128 10.64.2.254;
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}
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'';
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};
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networking = {
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useDHCP = false;
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hostName = "blowhole";
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resolvconf.useLocalResolver = false;
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nameservers = [ "10.64.2.1" ];
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# Disable the in-built iptable based firewall
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firewall.enable = mkForce false;
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interfaces = {
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# Don't do DHCP on the LAN interface
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"${lan}" = {
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useDHCP = false;
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ipv4.addresses = [{
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address = "10.64.2.1";
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prefixLength = 24;
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}];
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};
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# But do DHCP on the WAN interface
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"${wan}".useDHCP = true;
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};
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wireguard = {
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enable = true;
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interfaces."${doVPN}" =
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config.magic_rb.secret.wireguard."${config.networking.hostName}"
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// {
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listenPort = 6666;
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privateKeyFile = "/var/secrets/${doVPN}.key";
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};
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};
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nftables = {
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enable = true;
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ruleset = ''
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table ip nf_filter {
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chain input_out {
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ct state { established, related } accept comment "Allow established traffic"
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icmp type { echo-request, destination-unreachable, time-exceeded } counter accept comment "Allow select ICMP"
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}
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chain input_doVPN {
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tcp dport { 4646, 4647, 4648 } accept comment "Nomad traffic"
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tcp dport { 8600, 8500, 8502, 8300, 8301, 8302 } accept comment "Consul traffic"
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tcp dport { 8200 } accept comment "Vault traffic"
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tcp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept comment "NFS traffic"
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tcp dport ${nomad.min_dynamic_port}-${nomad.max_dynamic_port} accept comment "Consul Connect sidecar traffic"
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udp dport { 8600, 8301, 8302 } comment "Consul traffic"
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udp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept comment "NFS traffic"
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udp dport ${nomad.min_dynamic_port}-${nomad.max_dynamic_port} accept comment "Consul Connect sidecar traffic"
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}
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chain input {
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type filter hook input priority 0; policy drop;
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tcp dport 22 accept comment "Accept SSH traffic always"
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iifname != "lo" tcp dport 5353 drop comment "Drop traffic to stubby always except for localhost to localhost traffic"
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iifname "nomad" oifname "nomad" accept comment "Allow Nomad to do whatever it wants in its interface"
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iifname { "${lan}", "lo" } accept comment "Allow local network to access the router"
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iifname { "${wan}", "${doVPN}", "nomad", "docker0" } jump input_out
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iifname { "${doVPN}" } jump input_doVPN
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# Allow containers to reach the DNS server
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iifname { "nomad", "docker0" } tcp dport 53 accept
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iifname { "nomad", "docker0" } udp dport 53 accept
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# Allow containers to reach the NFS server
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iifname { "docker0" } tcp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept comment "NFS traffic"
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iifname { "docker0" } udp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept comment "NFS traffic"
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meta nftrace set 1
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}
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chain output {
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type filter hook input priority 0; policy accept;
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# Drop all DNS traffic if leaving through "wan"
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oifname { "${wan}" } tcp dport 53 drop
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oifname { "${wan}" } udp dport 53 drop
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# Allow DoT traffic to leave through "wan" if it comes from "lo"
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iifname != { "lo" } oifname { "${wan}" } tcp dport 853 drop
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}
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chain forward {
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type filter hook forward priority 10; policy drop;
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# Enable flow offloading for better throughput
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# ip protocol { tcp, udp } flow offload @f
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# Drop all DNS or DoT traffic if forwarded through "wan"
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oifname { "${wan}" } tcp dport 853 drop
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oifname { "${wan}" } tcp dport 53 drop
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oifname { "${wan}" } udp dport 53 drop
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# Allow trusted LAN to WAN"
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iifname { "${lan}" } oifname { "${wan}" } accept
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iifname { "${wan}" } oifname { "${lan}" } ct state established, related accept
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iifname { "nomad" } oifname { "${doVPN}", "${lan}" } accept
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iifname { "${doVPN}", "${lan}" } oifname { "nomad" } accept
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iifname { "${doVPN}" } oifname { "${lan}" } accept
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iifname { "${lan}" } oifname { "${doVPN}" } accept
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# Allow containers to reach WAN
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iifname { "nomad", "docker0" } oifname { "${wan}" } accept
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iifname { "${wan}" } oifname { "nomad", "docker0" } ct state established, related accept
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# Allow containers to reach the DNS and NFS server
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iifname { "nomad", "docker0" } oifname { "${lan}" } ip daddr 10.64.2.1 tcp dport { 53 } accept
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iifname { "nomad", "docker0" } oifname { "${lan}" } ip saddr 10.64.2.1 tcp sport { 53 } accept
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iifname { "nomad", "docker0" } oifname { "${lan}" } ip daddr 10.64.2.1 tcp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept
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iifname { "nomad", "docker0" } oifname { "${lan}" } ip saddr 10.64.2.1 tcp sport { 111, 2049, 4000, 4001, 4002, 20048 } accept
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iifname { "nomad", "docker0" } oifname { "${lan}" } ip daddr 10.64.2.1 udp dport { 53 } accept
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iifname { "nomad", "docker0" } oifname { "${lan}" } ip saddr 10.64.2.1 udp sport { 53 } accept
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iifname { "nomad", "docker0" } oifname { "${lan}" } ip daddr 10.64.2.1 udp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept
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iifname { "nomad", "docker0" } oifname { "${lan}" } ip saddr 10.64.2.1 udp sport { 111, 2049, 4000, 4001, 4002, 20048 } accept
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# Rules to make CNI happy
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meta mark and 0x01 == 0x01 accept
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meta nftrace set 1
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}
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}
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table ip nf_nat {
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chain postrouting {
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type nat hook postrouting priority 100; policy accept;
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oifname "${wan}" masquerade
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}
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chain prerouting {
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type nat hook prerouting priority 100; policy accept;
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}
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}
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table ip6 nf_filter {
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chain input {
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type filter hook input priority 0; policy drop;
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}
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chain forward {
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type filter hook forward priority 0; policy drop;
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}
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}
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'';
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};
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};
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systemd.services.nftables = {
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serviceConfig =
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let
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rulesScript = pkgs.writeShellScript "nftables-rules" ''
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set -ex
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export PATH=${pkgs.nftables}/bin:${pkgs.iptables}/bin:${pkgs.bash}/bin:$PATH
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tmpfile="$(mktemp)"
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iptables-save -t filter >> $tmpfile
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iptables-save -t nat >> $tmpfile
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nft flush ruleset
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cat $tmpfile | iptables-restore
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nft -f "${config.networking.nftables.rulesetFile}"
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rm $tmpfile
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iptables -D FORWARD -j MARK --set-mark 0x01 || true
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iptables -D FORWARD -j MARK --set-mark 0x00 || true
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iptables -I FORWARD -j MARK --set-mark 0x01
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iptables -A FORWARD -j MARK --set-mark 0x00
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'';
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in {
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ExecStart = mkForce rulesScript;
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ExecReload = mkForce rulesScript;
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ExecStop = mkForce (pkgs.writeShellScript "nftables-flush" ''
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set -ex
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export PATH=${pkgs.nftables}/bin:${pkgs.iptables}/bin:${pkgs.bash}/bin:$PATH
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tmpfile="$(mktemp)"
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iptables-save -t filter >> $tmpfile
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iptables-save -t nat >> $tmpfile
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nft flush ruleset
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cat $tmpfile | iptables-restore
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rm $tmpfile
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iptables -D FORWARD -j MARK --set-mark 0x01 || true
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iptables -D FORWARD -j MARK --set-mark 0x00 || true
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iptables -I FORWARD -j MARK --set-mark 0x01
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iptables -A FORWARD -j MARK --set-mark 0x00
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'');
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};
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};
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}
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