nachtigall: Deploy coturn and configure matrix to use it

hosts/nachtigall/apps/coturn.nix

@@ -0,0 +1,94 @@
+{flake, config, lib, ...}:
+{
+  age.secrets."coturn-static-auth-secret" = {
+    file = "${flake.self}/secrets/coturn-static-auth-secret.age";
+    mode = "400";
+    owner = "turnserver";
+  };
+
+  services.coturn = rec {
+    enable = true;
+    no-cli = true;
+    no-tcp-relay = true;
+    min-port = 49000;
+    max-port = 50000;
+    use-auth-secret = true;
+    static-auth-secret-file = "/run/agenix/coturn-static-auth-secret";
+    realm = "turn.test.pub.solar";
+    cert = "${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 = "pub.solar";
+  };
+
+  users.users.nginx.extraGroups = [ "turnserver" ];
+}

hosts/nachtigall/apps/matrix/synapse.nix

@@ -169,11 +169,14 @@ in {
 
       stream_writers = {};
       trusted_key_servers = [{ server_name = "matrix.org";}];
+
       turn_allow_guests = false;
       turn_uris = [
-        "turn:matrix.pub.solar?transport=udp"
-        "turn:matrix.pub.solar?transport=tcp"
+        "turn:${config.services.coturn.realm}:3478?transport=udp"
+        "turn:${config.services.coturn.realm}:3478?transport=tcp"
       ];
+      turn_user_lifetime = "1h";
+
       url_preview_accept_language = [
         "en-US"
         "en"

hosts/nachtigall/default.nix

@@ -11,6 +11,7 @@
       ./apps/nginx.nix
 
       ./apps/collabora.nix
+      ./apps/coturn.nix
       ./apps/forgejo.nix
       ./apps/keycloak.nix
       ./apps/mailman.nix

secrets/coturn-static-auth-secret.age

@@ -0,0 +1,28 @@
+age-encryption.org/v1
+-> ssh-ed25519 iDKjwg FkQYu4K7yxWuKQChw28kOJrZqXDelVmzExig/cEmxjI
+apgJOiOv/gLcSRTcAkhzDZyLdiKbnsipnNt6okrZ6os
+-> ssh-ed25519 uYcDNw wfyuSGgrFXRAcNSZoBTCz8kJOMeocD1BFwQ1hhO6dD0
+J5hhkK/S+RXjDp/kFGOXP1dDxTyKQx5MqhohgKTP8PQ
+-> ssh-rsa kFDS0A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+-> ssh-ed25519 YFSOsg 5H/taWUdjZcoYSFndLcYZPX8JUtK6BJs2ou1oJnT6k0
+dTOUWXMuaERYbfHo6AaiM4NfPWKxTk95YFpRkxq06jQ
+-> ssh-ed25519 iHV63A KFTTfUVH8bb+ebLc3WefjyFt2YGdfD8cQiK+VURRplI
+d75sa9BchGJl1NdVHCZ5s4f/RqV5TE7jBtC02OnOt2E
+-> ssh-ed25519 BVsyTA 8BbKlmlVJvPSoZuVazuOyR2YXncwTHAP80hDYpshjz4
+I+u3zwtSecaLeOOR1WJ5+fwWTgn31PvW38kkPgGQ4sM
+-> X}64s-grease V7
+U9Gkb6Sn+PV3lgb6Kzl0ATgibtLzSm//Z60gct7j8F2wVosjicXaWpv+LVfdBo86
+JlXZuA
+--- zjT2F/dHJX8rxVXgbjZMsToMSPUXPLwbeAhGiNawKlc
+­†ÝˆÉ©õÖ‘èËŽ{´–ýÍHª™©kÂ0Z•Yê*¯ÿð“òb;—ÕX#æˆ-•Å¸æé£Í®¸´£Ýé&n<>/mxl
9ò<39>|œc	K$åÐú&‹þâ*Š$zÿ‹1÷zÐ

secrets/secrets.nix

@@ -60,4 +60,6 @@ in {
   "mediawiki-admin-password.age".publicKeys = nachtigallKeys ++ baseKeys;
   "mediawiki-oidc-client-secret.age".publicKeys = nachtigallKeys ++ baseKeys;
   "mediawiki-secret-key.age".publicKeys = nachtigallKeys ++ baseKeys;
+
+  "coturn-static-auth-secret.age".publicKeys = nachtigallKeys ++ baseKeys;
 }

terraform/dns.tf

@@ -196,6 +196,12 @@ resource "namecheap_domain_records" "pub-solar" {
     type = "CNAME"
     address = "nachtigall.pub.solar."
   }
+  record {
+    hostname = "turn.test"
+    type = "CNAME"
+    address = "nachtigall.pub.solar."
+    ttl = "300"
+  }
   # SRV records can only be changed via NameCheap Web UI
   # add comment
 }