infra/modules/coturn/default.nix

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{ flake, config, lib, ... }:
{
age.secrets."coturn-static-auth-secret" = {
file = "${flake.self}/secrets/coturn-static-auth-secret.age";
mode = "400";
owner = "turnserver";
};
services.coturn = rec {
enable = true;
no-cli = true;
no-tcp-relay = true;
min-port = 49000;
max-port = 50000;
use-auth-secret = true;
static-auth-secret-file = "/run/agenix/coturn-static-auth-secret";
realm = "turn.${config.pub-solar-os.networking.domain}";
cert = "${config.security.acme.certs.${realm}.directory}/full.pem";
pkey = "${config.security.acme.certs.${realm}.directory}/key.pem";
extraConfig =
let
externalIPv4s = lib.strings.concatMapStringsSep "\n" ({ address, ... }: "external-ip=${address}") config.networking.interfaces.enp35s0.ipv4.addresses;
externalIPv6s = lib.strings.concatMapStringsSep "\n" ({ address, ... }: "external-ip=${address}") config.networking.interfaces.enp35s0.ipv6.addresses;
in
''
${externalIPv4s}
${externalIPv6s}
no-tlsv1
no-tlsv1_1
no-rfc5780
response-origin-only-with-rfc5780
prod
no-stun-backward-compatibility
# ban private IP ranges
no-multicast-peers
denied-peer-ip=0.0.0.0-0.255.255.255
denied-peer-ip=10.0.0.0-10.255.255.255
denied-peer-ip=100.64.0.0-100.127.255.255
denied-peer-ip=127.0.0.0-127.255.255.255
denied-peer-ip=169.254.0.0-169.254.255.255
denied-peer-ip=172.16.0.0-172.31.255.255
denied-peer-ip=192.0.0.0-192.0.0.255
denied-peer-ip=192.0.2.0-192.0.2.255
denied-peer-ip=192.88.99.0-192.88.99.255
denied-peer-ip=192.168.0.0-192.168.255.255
denied-peer-ip=198.18.0.0-198.19.255.255
denied-peer-ip=198.51.100.0-198.51.100.255
denied-peer-ip=203.0.113.0-203.0.113.255
denied-peer-ip=240.0.0.0-255.255.255.255
denied-peer-ip=::1
denied-peer-ip=64:ff9b::-64:ff9b::ffff:ffff
denied-peer-ip=::ffff:0.0.0.0-::ffff:255.255.255.255
denied-peer-ip=100::-100::ffff:ffff:ffff:ffff
denied-peer-ip=2001::-2001:1ff:ffff:ffff:ffff:ffff:ffff:ffff
denied-peer-ip=2002::-2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff
denied-peer-ip=fc00::-fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
denied-peer-ip=fe80::-febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff
'';
};
networking.firewall = {
interfaces.enp35s0 =
let
range = with config.services.coturn; [{
from = min-port;
to = max-port;
}];
in
{
allowedUDPPortRanges = range;
allowedUDPPorts = [ 3478 5349 ];
allowedTCPPortRanges = [ ];
allowedTCPPorts = [ 3478 5349 ];
};
};
# get a certificate
security.acme.certs.${config.services.coturn.realm} = {
/* insert here the right configuration to obtain a certificate */
postRun = "systemctl restart coturn.service";
group = "turnserver";
};
services.nginx.virtualHosts.${config.services.coturn.realm} = {
enableACME = true;
addSSL = true;
globalRedirect = "${config.pub-solar-os.networking.domain}";
};
users.users.nginx.extraGroups = [ "turnserver" ];
}