89 lines
3.7 KiB
Nix
89 lines
3.7 KiB
Nix
{ config, pkgs, lib, ... }: {
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# TODO: Generate coturn secret
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sops.secrets.coturn-secret = {
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owner = "turnserver";
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group = config.services.matrix-tuwunel.group;
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mode = "0440";
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};
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# TODO: patch coturn service to specify user/group
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systemd.services.coturn.serviceConfig.Group = lib.mkForce config.services.caddy.group;
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services.coturn = {
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enable = true;
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realm = "turn.glia.club";
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listening-port = 3478;
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tls-listening-port = 5349;
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min-port = config.services.livekit.settings.rtc.port_range_start+1;
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max-port = 52000;
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use-auth-secret = true;
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static-auth-secret-file = config.sops.secrets.coturn-secret.path;
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cert = "/var/lib/caddy/.local/share/caddy/certificates/acme.zerossl.com-v2-dv90/turn.glia.club/turn.glia.club.crt";
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pkey = "/var/lib/caddy/.local/share/caddy/certificates/acme.zerossl.com-v2-dv90/turn.glia.club/turn.glia.club.key";
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extraConfig = ''
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# VoIP traffic is all UDP. There is no reason to let users connect to arbitrary TCP endpoints via the relay.
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no-tcp-relay
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# don't let the relay ever try to connect to private IP address ranges within your network (if any)
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# given the turn server is likely behind your firewall, remember to include any privileged public IPs too.
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denied-peer-ip=10.0.0.0-10.255.255.255
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denied-peer-ip=192.168.0.0-192.168.255.255
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denied-peer-ip=172.16.0.0-172.31.255.255
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# recommended additional local peers to block, to mitigate external access to internal services.
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# https://www.enablesecurity.com/blog/slack-webrtc-turn-compromise-and-bug-bounty/#how-to-fix-an-open-turn-relay-to-address-this-vulnerability
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# https://www.enablesecurity.com/blog/cve-2020-26262-bypass-of-coturns-access-control-protection/#further-concerns-what-else
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no-multicast-peers
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denied-peer-ip=0.0.0.0-0.255.255.255
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denied-peer-ip=100.64.0.0-100.127.255.255
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denied-peer-ip=127.0.0.0-127.255.255.255
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denied-peer-ip=169.254.0.0-169.254.255.255
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denied-peer-ip=192.0.0.0-192.0.0.255
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denied-peer-ip=192.0.2.0-192.0.2.255
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denied-peer-ip=192.88.99.0-192.88.99.255
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denied-peer-ip=198.18.0.0-198.19.255.255
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denied-peer-ip=198.51.100.0-198.51.100.255
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denied-peer-ip=203.0.113.0-203.0.113.255
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denied-peer-ip=240.0.0.0-255.255.255.255
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denied-peer-ip=::1
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denied-peer-ip=64:ff9b::-64:ff9b::ffff:ffff
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denied-peer-ip=::ffff:0.0.0.0-::ffff:255.255.255.255
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denied-peer-ip=100::-100::ffff:ffff:ffff:ffff
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denied-peer-ip=2001::-2001:1ff:ffff:ffff:ffff:ffff:ffff:ffff
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denied-peer-ip=2002::-2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff
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denied-peer-ip=fc00::-fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
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denied-peer-ip=fe80::-febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff
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# special case the turn server itself so that client->TURN->TURN->client flows work
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# this should be one of the turn server's listening IPs
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allowed-peer-ip=10.0.0.1
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# consider whether you want to limit the quota of relayed streams per user (or total) to avoid risk of DoS.
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user-quota=12 # 4 streams per video call, so 12 streams = 3 simultaneous relayed calls per user.
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total-quota=1200
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'';
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};
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services.matrix-tuwunel.settings = {
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global = {
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turn_uris = [
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"turn:turn.glia.club?transport=udp"
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"turn:turn.glia.club?transport=tcp"
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];
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turn_secret_file = config.sops.secrets.coturn-secret.path;
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};
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};
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services.caddy.virtualHosts = {
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"turn.glia.club" = {
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# Use ZeroSSL
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# as WebRTC clients misbehave with LetsEncrypt:
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# https://github.com/element-hq/element-android/issues/1533
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# https://github.com/element-hq/element-ios/issues/2712
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# https://bugs.chromium.org/p/webrtc/issues/detail?id=11710
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extraConfig = ''
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tls {
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ca https://acme.zerossl.com/v2/DV90
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}
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respond "You ~~spin~~ turn me right round!"
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'';
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};
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};
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}
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