From cede6c96f08088211341e69c4a20d7d130cf6f79 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Fri, 25 Feb 2022 11:38:55 +0100
Subject: surtr: matrix: turn server

---
 hosts/surtr/matrix/default.nix | 78 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 77 insertions(+), 1 deletion(-)

(limited to 'hosts/surtr/matrix/default.nix')

diff --git a/hosts/surtr/matrix/default.nix b/hosts/surtr/matrix/default.nix
index 6b580bea..2ef78b3d 100644
--- a/hosts/surtr/matrix/default.nix
+++ b/hosts/surtr/matrix/default.nix
@@ -31,12 +31,22 @@
       tls_private_key_path = "/run/credentials/matrix-synapse.service/synapse.li.key.pem";
       tls_dh_params_path = config.security.dhparams.params.matrix-synapse.path;
 
-      extraConfigFiles = ["/run/credentials/matrix-synapse.service/registration.yaml"];
+      turn_uris = ["turns:turn.synapse.li?transport=udp" "turns:turn.synapse.li?transport=tcp"];
+      turn_user_lifetime = "1h";
+
+      extraConfigFiles = [
+        "/run/credentials/matrix-synapse.service/registration.yaml"
+        "/run/credentials/matrix-synapse.service/turn-secret.yaml"
+      ];
     };
     sops.secrets."matrix-synapse-registration.yaml" = {
       format = "binary";
       sopsFile = ./registration.yaml;
     };
+    sops.secrets."matrix-synapse-turn-secret.yaml" = {
+      format = "binary";
+      sopsFile = ./coturn-auth-secret.yaml;
+    };
 
     systemd.services.matrix-synapse = {
       serviceConfig = {
@@ -44,6 +54,7 @@
           "synapse.li.key.pem:${config.security.acme.certs."synapse.li".directory}/key.pem"
           "synapse.li.pem:${config.security.acme.certs."synapse.li".directory}/fullchain.pem"
           "registration.yaml:${config.sops.secrets."matrix-synapse-registration.yaml".path}"
+          "turn-secret.yaml:${config.sops.secrets."matrix-synapse-turn-secret.yaml".path}"
         ];
       };
     };
@@ -110,6 +121,11 @@
       };
       "turn.synapse.li" = {
         zone = "synapse.li";
+        certCfg = {
+          postRun = ''
+            ${pkgs.systemd}/bin/systemctl try-restart coturn.service
+          '';
+        };
       };
       "synapse.li".certCfg = {
         postRun = ''
@@ -131,5 +147,65 @@
         ];
       };
     };
+
+    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.sops.secrets."coturn-auth-secret".path;
+      realm = "turn.synapse.li";
+      cert = "/run/credentials/coturn.service/turn.synapse.li.pem";
+      pkey = "/run/credentials/coturn.service/turn.synapse.li.key.pem";
+      dh-file = config.security.dhparams.params.coturn.path;
+      relay-ips = ["202.61.241.61" "2a03:4000:52:ada::"];
+      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
+
+        denied-peer-ip=2a03:4000:52:ada::1-2a03:4000:52:ada:ffff:ffff:ffff:ffff
+      '';
+    };
+    systemd.services.coturn = {
+      serviceConfig = {
+        LoadCredential = [
+          "turn.synapse.li.key.pem:${config.security.acme.certs."turn.synapse.li".directory}/key.pem"
+          "turn.synapse.li.pem:${config.security.acme.certs."turn.synapse.li".directory}/fullchain.pem"
+        ];
+      };
+    };
+
+    sops.secrets."coturn-auth-secret" = {
+      format = "binary";
+      sopsFile = ./coturn-auth-secret;
+      owner = "turnserver";
+      group = "turnserver";
+    };
   };
 }
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