services: add coturn with secret

modules/services/server/coturn.nix

@@ -0,0 +1,75 @@
+{config, pkgs, lib, ...}: {
+  # enable coturn
+  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 = config.age.secrets."services/coturn/static-auth".path;
+    realm = "turn.kabtop.de";
+    cert = "${config.security.acme.certs.${realm}.directory}/full.pem";
+    pkey = "${config.security.acme.certs.${realm}.directory}/key.pem";
+    extraConfig = ''
+      # for debugging
+      verbose
+      # 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
+    '';
+  };
+  # open the firewall
+  networking.firewall = {
+    interfaces.ens18 = let
+      range = with config.services.coturn; [ {
+      from = min-port;
+      to = max-port;
+    } ];
+    in
+    {
+      allowedUDPPortRanges = range;
+      allowedUDPPorts = [ 3478 ];
+      allowedTCPPortRanges = range;
+      allowedTCPPorts = [ 3478 ];
+    };
+  };
+  # get a certificate
+  security.acme.certs.${config.services.coturn.realm} = {
+    /* insert here the right configuration to obtain a certificate */
+    postRun = "systemctl restart coturn.service";
+    group = "turnserver";
+  };
+  # configure synapse to point users to coturn
+  services.matrix-synapse = with config.services.coturn; {
+    turn_uris = ["turn:${realm}:3478?transport=udp" "turn:${realm}:3478?transport=tcp"];
+    turn_shared_secret = static-auth-secret;
+    turn_user_lifetime = "1h";
+  };
+
+  age.secrets."services/coturn/static-auth" = {
+      file = ../../../secrets/services/coturn/static-auth.age;
+      owner = "turnserver";
+  }
+}

modules/services/server/default.nix

@@ -15,6 +15,7 @@
   #./gitea.nix
   #./nextcloud.nix
   #./matrix.nix
+  ./coturn.nix
   ./jitsi.nix
 ]