nixos-config/machines/renge/services/coturn.nix

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{ config, lib, pkgs, ... }:
let
cfg = config.services.coturn;
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fqdn = "turn.sbruder.de";
in
{
sops.secrets.turn-static-auth-secret = {
owner = "turnserver";
sopsFile = ../secrets.yaml;
};
services.coturn = {
enable = true;
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# config adapted from synapses turn howto:
# https://github.com/matrix-org/synapse/blob/develop/docs/turn-howto.md
use-auth-secret = true;
realm = fqdn;
# the NixOS module does not support loading the secret from a dedicated file
static-auth-secret-file = config.sops.secrets.turn-static-auth-secret.path;
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no-tcp-relay = true;
cert = "/run/turnserver/fullchain.pem";
pkey = "/run/turnserver/key.pem";
min-port = 49160;
max-port = 49200;
no-cli = true;
extraConfig = ''
denied-peer-ip=10.0.0.0-10.255.255.255
denied-peer-ip=192.168.0.0-192.168.255.255
denied-peer-ip=172.16.0.0-172.31.255.255
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# https://www.rtcsec.com/article/cve-2020-26262-bypass-of-coturns-access-control-protection/
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
user-quota=12
total-quota=1200
'';
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};
systemd.services.coturn = {
after = [ "acme-finished-${fqdn}.target" ];
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serviceConfig = {
ExecStartPre = lib.singleton "!${pkgs.writeShellScript "coturn-setup-tls" ''
cp ${config.security.acme.certs."${fqdn}".directory}/{fullchain,key}.pem /run/turnserver/
chgrp turnserver /run/turnserver/{fullchain,key}.pem
''}";
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};
};
security.acme.certs."${fqdn}".postRun = ''
if systemctl is-active coturn; then
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systemctl --no-block restart coturn
fi
'';
services.nginx.virtualHosts."${fqdn}" = {
enableACME = true;
forceSSL = true;
};
networking.firewall = {
allowedTCPPorts = with cfg; [ listening-port alt-listening-port tls-listening-port ];
allowedUDPPorts = with cfg; [ listening-port alt-listening-port tls-listening-port ];
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allowedUDPPortRanges = lib.singleton {
from = cfg.min-port;
to = cfg.min-port;
};
};
}