mirror of
https://git.sr.ht/~magic_rb/dotfiles
synced 2024-11-26 10:06:13 +01:00
278 lines
9.9 KiB
Nix
278 lines
9.9 KiB
Nix
{ pkgs, config, lib, ... }:
|
|
with lib;
|
|
let
|
|
lan = "enp7s0f0";
|
|
wan = "enp7s0f1";
|
|
doVPN = "do_vpn0";
|
|
|
|
nomad = mapAttrs (const toString) {
|
|
inherit (config.services.hashicorp.nomad.settings.client)
|
|
min_dynamic_port
|
|
max_dynamic_port;
|
|
};
|
|
in
|
|
{
|
|
boot.kernel.sysctl = {
|
|
# Enable forwarding on IPv4 but disable on IPv6
|
|
"net.ipv4.conf.all.forwarding" = true;
|
|
"net.ipv6.conf.all.forwarding" = false;
|
|
|
|
# source: https://github.com/mdlayher/homelab/blob/master/nixos/routnerr-2/configuration.nix#L52
|
|
# By default, not automatically configure any IPv6 addresses.
|
|
"net.ipv6.conf.all.accept_ra" = 0;
|
|
"net.ipv6.conf.all.autoconf" = 0;
|
|
"net.ipv6.conf.all.use_tempaddr" = 0;
|
|
|
|
# On WAN, allow IPv6 autoconfiguration and tempory address use.
|
|
# "net.ipv6.conf.${name}.accept_ra" = 2;
|
|
# "net.ipv6.conf.${name}.autoconf" = 1;
|
|
};
|
|
|
|
services.stubby = {
|
|
enable = true;
|
|
settings = {
|
|
resolution_type = "GETDNS_RESOLUTION_STUB";
|
|
dns_transport_list = [
|
|
"GETDNS_TRANSPORT_TLS"
|
|
];
|
|
tls_authentication = "GETDNS_AUTHENTICATION_REQUIRED";
|
|
tls_query_padding_blocksize = 256;
|
|
edns_client_subnet_private = 1;
|
|
idle_timeout = 10000;
|
|
listen_addresses = [
|
|
"127.0.0.1@5353"
|
|
];
|
|
dnssec_return_status = "GETDNS_EXTENSION_TRUE";
|
|
appdata_dir = "/var/cache/stubby";
|
|
round_robin_upstreams = 1;
|
|
upstream_recursive_servers = [
|
|
{
|
|
address_data = "9.9.9.9";
|
|
tls_auth_name = "dns9.quad9.net";
|
|
tls_pubkey_pinset = {
|
|
digest = "sha384";
|
|
value = "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEfYvXHQOFDRglszQcKaEn1KwBJUiKoPHqArnYUSwIaqxyVuz6Paagn0kJVY6s/rlzF1wC+3jMJJGUb0MjiQ4dZg==";
|
|
};
|
|
}
|
|
];
|
|
};
|
|
};
|
|
|
|
services.dhcpd4 = {
|
|
enable = true;
|
|
interfaces = [ "${lan}" ];
|
|
extraConfig = ''
|
|
option domain-name-servers 10.64.2.1;
|
|
option subnet-mask 255.255.255.0;
|
|
|
|
subnet 10.64.2.0 netmask 255.255.255.0 {
|
|
option broadcast-address 10.64.2.255;
|
|
option routers 10.64.2.1;
|
|
interface ${lan};
|
|
range 10.64.2.128 10.64.2.254;
|
|
}
|
|
'';
|
|
};
|
|
|
|
networking = {
|
|
useDHCP = false;
|
|
hostName = "blowhole";
|
|
|
|
resolvconf.useLocalResolver = false;
|
|
nameservers = [ "10.64.2.1" ];
|
|
|
|
# Disable the in-built iptable based firewall
|
|
firewall.enable = mkForce false;
|
|
|
|
interfaces = {
|
|
# Don't do DHCP on the LAN interface
|
|
"${lan}" = {
|
|
useDHCP = false;
|
|
ipv4.addresses = [{
|
|
address = "10.64.2.1";
|
|
prefixLength = 24;
|
|
}];
|
|
};
|
|
# But do DHCP on the WAN interface
|
|
"${wan}".useDHCP = true;
|
|
};
|
|
|
|
wireguard = {
|
|
enable = true;
|
|
interfaces."${doVPN}" =
|
|
config.magic_rb.secret.wireguard."${config.networking.hostName}"
|
|
// {
|
|
listenPort = 6666;
|
|
privateKeyFile = "/var/secrets/${doVPN}.key";
|
|
};
|
|
};
|
|
|
|
nftables = {
|
|
enable = true;
|
|
ruleset = ''
|
|
table ip nf_filter {
|
|
chain input_out {
|
|
ct state { established, related } accept comment "Allow established traffic"
|
|
icmp type { echo-request, destination-unreachable, time-exceeded } counter accept comment "Allow select ICMP"
|
|
}
|
|
|
|
chain input_doVPN {
|
|
tcp dport { 4646, 4647, 4648 } accept comment "Nomad traffic"
|
|
tcp dport { 8600, 8500, 8502, 8300, 8301, 8302 } accept comment "Consul traffic"
|
|
tcp dport { 8200 } accept comment "Vault traffic"
|
|
tcp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept comment "NFS traffic"
|
|
tcp dport ${nomad.min_dynamic_port}-${nomad.max_dynamic_port} accept comment "Consul Connect sidecar traffic"
|
|
|
|
udp dport { 8600, 8301, 8302 } comment "Consul traffic"
|
|
udp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept comment "NFS traffic"
|
|
udp dport ${nomad.min_dynamic_port}-${nomad.max_dynamic_port} accept comment "Consul Connect sidecar traffic"
|
|
}
|
|
|
|
chain input {
|
|
type filter hook input priority 0; policy drop;
|
|
|
|
tcp dport 22 accept comment "Accept SSH traffic always"
|
|
iifname != "lo" tcp dport 5353 drop comment "Drop traffic to stubby always except for localhost to localhost traffic"
|
|
|
|
iifname "nomad" oifname "nomad" accept comment "Allow Nomad to do whatever it wants in its interface"
|
|
iifname { "${lan}", "lo" } accept comment "Allow local network to access the router"
|
|
iifname { "${wan}", "${doVPN}", "nomad", "docker0" } jump input_out
|
|
iifname { "${doVPN}" } jump input_doVPN
|
|
|
|
# Allow containers to reach the DNS server
|
|
iifname { "nomad", "docker0" } tcp dport 53 accept
|
|
iifname { "nomad", "docker0" } udp dport 53 accept
|
|
|
|
# Allow containers to reach the NFS server
|
|
iifname { "docker0" } tcp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept comment "NFS traffic"
|
|
iifname { "docker0" } udp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept comment "NFS traffic"
|
|
|
|
meta nftrace set 1
|
|
}
|
|
|
|
chain output {
|
|
type filter hook input priority 0; policy accept;
|
|
|
|
# Drop all DNS traffic if leaving through "wan"
|
|
oifname { "${wan}" } tcp dport 53 drop
|
|
oifname { "${wan}" } udp dport 53 drop
|
|
# Allow DoT traffic to leave through "wan" if it comes from "lo"
|
|
iifname != { "lo" } oifname { "${wan}" } tcp dport 853 drop
|
|
}
|
|
|
|
chain forward {
|
|
type filter hook forward priority 10; policy drop;
|
|
|
|
# Enable flow offloading for better throughput
|
|
# ip protocol { tcp, udp } flow offload @f
|
|
|
|
# Drop all DNS or DoT traffic if forwarded through "wan"
|
|
oifname { "${wan}" } tcp dport 853 drop
|
|
oifname { "${wan}" } tcp dport 53 drop
|
|
oifname { "${wan}" } udp dport 53 drop
|
|
|
|
# Allow trusted LAN to WAN"
|
|
iifname { "${lan}" } oifname { "${wan}" } accept
|
|
iifname { "${wan}" } oifname { "${lan}" } ct state established, related accept
|
|
|
|
|
|
iifname { "nomad" } oifname { "${doVPN}", "${lan}" } accept
|
|
iifname { "${doVPN}", "${lan}" } oifname { "nomad" } accept
|
|
iifname { "${doVPN}" } oifname { "${lan}" } accept
|
|
iifname { "${lan}" } oifname { "${doVPN}" } accept
|
|
|
|
# Allow containers to reach WAN
|
|
iifname { "nomad", "docker0" } oifname { "${wan}" } accept
|
|
iifname { "${wan}" } oifname { "nomad", "docker0" } ct state established, related accept
|
|
|
|
# Allow containers to reach the DNS and NFS server
|
|
iifname { "nomad", "docker0" } oifname { "${lan}" } ip daddr 10.64.2.1 tcp dport { 53 } accept
|
|
iifname { "nomad", "docker0" } oifname { "${lan}" } ip saddr 10.64.2.1 tcp sport { 53 } accept
|
|
iifname { "nomad", "docker0" } oifname { "${lan}" } ip daddr 10.64.2.1 tcp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept
|
|
iifname { "nomad", "docker0" } oifname { "${lan}" } ip saddr 10.64.2.1 tcp sport { 111, 2049, 4000, 4001, 4002, 20048 } accept
|
|
iifname { "nomad", "docker0" } oifname { "${lan}" } ip daddr 10.64.2.1 udp dport { 53 } accept
|
|
iifname { "nomad", "docker0" } oifname { "${lan}" } ip saddr 10.64.2.1 udp sport { 53 } accept
|
|
iifname { "nomad", "docker0" } oifname { "${lan}" } ip daddr 10.64.2.1 udp dport { 111, 2049, 4000, 4001, 4002, 20048 } accept
|
|
iifname { "nomad", "docker0" } oifname { "${lan}" } ip saddr 10.64.2.1 udp sport { 111, 2049, 4000, 4001, 4002, 20048 } accept
|
|
|
|
|
|
# Rules to make CNI happy
|
|
meta mark and 0x01 == 0x01 accept
|
|
|
|
meta nftrace set 1
|
|
}
|
|
}
|
|
|
|
table ip nf_nat {
|
|
chain postrouting {
|
|
type nat hook postrouting priority 100; policy accept;
|
|
oifname "${wan}" masquerade
|
|
}
|
|
|
|
chain prerouting {
|
|
type nat hook prerouting priority 100; policy accept;
|
|
}
|
|
}
|
|
|
|
table ip6 nf_filter {
|
|
chain input {
|
|
type filter hook input priority 0; policy drop;
|
|
}
|
|
chain forward {
|
|
type filter hook forward priority 0; policy drop;
|
|
}
|
|
}
|
|
'';
|
|
};
|
|
};
|
|
|
|
systemd.services.nftables = {
|
|
serviceConfig =
|
|
let
|
|
rulesScript = pkgs.writeShellScript "nftables-rules" ''
|
|
set -ex
|
|
export PATH=${pkgs.nftables}/bin:${pkgs.iptables}/bin:${pkgs.bash}/bin:$PATH
|
|
|
|
tmpfile="$(mktemp)"
|
|
iptables-save -t filter >> $tmpfile
|
|
iptables-save -t nat >> $tmpfile
|
|
|
|
nft flush ruleset
|
|
|
|
cat $tmpfile | iptables-restore
|
|
nft -f "${config.networking.nftables.rulesetFile}"
|
|
rm $tmpfile
|
|
|
|
iptables -D FORWARD -j MARK --set-mark 0x01 || true
|
|
iptables -D FORWARD -j MARK --set-mark 0x00 || true
|
|
|
|
iptables -I FORWARD -j MARK --set-mark 0x01
|
|
iptables -A FORWARD -j MARK --set-mark 0x00
|
|
'';
|
|
in {
|
|
ExecStart = mkForce rulesScript;
|
|
ExecReload = mkForce rulesScript;
|
|
ExecStop = mkForce (pkgs.writeShellScript "nftables-flush" ''
|
|
set -ex
|
|
export PATH=${pkgs.nftables}/bin:${pkgs.iptables}/bin:${pkgs.bash}/bin:$PATH
|
|
|
|
tmpfile="$(mktemp)"
|
|
iptables-save -t filter >> $tmpfile
|
|
iptables-save -t nat >> $tmpfile
|
|
|
|
nft flush ruleset
|
|
|
|
cat $tmpfile | iptables-restore
|
|
rm $tmpfile
|
|
|
|
iptables -D FORWARD -j MARK --set-mark 0x01 || true
|
|
iptables -D FORWARD -j MARK --set-mark 0x00 || true
|
|
|
|
iptables -I FORWARD -j MARK --set-mark 0x01
|
|
iptables -A FORWARD -j MARK --set-mark 0x00
|
|
'');
|
|
};
|
|
};
|
|
}
|
|
|