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  149. <h1 id="eturnal-turn-server"><a class="header" href="#eturnal-turn-server">eturnal TURN server</a></h1>
  150. <p>The following sections describe how to install <a href="https://github.com/processone/eturnal">eturnal</a>
  151. (which implements the TURN REST API).</p>
  152. <h2 id="eturnal-setup"><a class="header" href="#eturnal-setup"><code>eturnal</code> setup</a></h2>
  153. <h3 id="initial-installation"><a class="header" href="#initial-installation">Initial installation</a></h3>
  154. <p>The <code>eturnal</code> TURN server implementation is available from a variety of sources
  155. such as native package managers, binary packages, installation from source or
  156. <a href="https://eturnal.net/documentation/code/docker.html">container image</a>. They are
  157. all described <a href="https://github.com/processone/eturnal#installation">here</a>.</p>
  158. <p>Quick-Test instructions in a <a href="https://github.com/processone/eturnal/blob/master/QUICK-TEST.md">Linux Shell</a>
  159. or with <a href="https://github.com/processone/eturnal/blob/master/docker-k8s/QUICK-TEST.md">Docker</a>
  160. are available as well.</p>
  161. <h3 id="configuration"><a class="header" href="#configuration">Configuration</a></h3>
  162. <p>After installation, <code>eturnal</code> usually ships a <a href="https://github.com/processone/eturnal/blob/master/config/eturnal.yml">default configuration file</a>
  163. here: <code>/etc/eturnal.yml</code> (and, if not found there, there is a backup file here:
  164. <code>/opt/eturnal/etc/eturnal.yml</code>). It uses the (indentation-sensitive!) <a href="https://en.wikipedia.org/wiki/YAML">YAML</a>
  165. format. The file contains further explanations.</p>
  166. <p>Here are some hints how to configure eturnal on your <a href="https://github.com/processone/eturnal#configuration">host machine</a>
  167. or when using e.g. <a href="https://eturnal.net/documentation/code/docker.html">Docker</a>.
  168. You may also further deep dive into the <a href="https://eturnal.net/documentation/">reference documentation</a>.</p>
  169. <p><code>eturnal</code> runs out of the box with the default configuration. To enable TURN and
  170. to integrate it with your homeserver, some aspects in <code>eturnal</code>'s default configuration file
  171. must be edited:</p>
  172. <ol>
  173. <li>
  174. <p>Homeserver's <a href="../../usage/configuration/config_documentation.html#turn_shared_secret"><code>turn_shared_secret</code></a>
  175. and eturnal's shared <code>secret</code> for authentication</p>
  176. <p>Both need to have the same value. Uncomment and adjust this line in <code>eturnal</code>'s
  177. configuration file:</p>
  178. <pre><code class="language-yaml">secret: &quot;long-and-cryptic&quot; # Shared secret, CHANGE THIS.
  179. </code></pre>
  180. <p>One way to generate a <code>secret</code> is with <code>pwgen</code>:</p>
  181. <pre><code class="language-sh">pwgen -s 64 1
  182. </code></pre>
  183. </li>
  184. <li>
  185. <p>Public IP address</p>
  186. <p>If your TURN server is behind NAT, the NAT gateway must have an external,
  187. publicly-reachable IP address. <code>eturnal</code> tries to autodetect the public IP address,
  188. however, it may also be configured by uncommenting and adjusting this line, so
  189. <code>eturnal</code> advertises that address to connecting clients:</p>
  190. <pre><code class="language-yaml">relay_ipv4_addr: &quot;203.0.113.4&quot; # The server's public IPv4 address.
  191. </code></pre>
  192. <p>If your NAT gateway is reachable over both IPv4 and IPv6, you may
  193. configure <code>eturnal</code> to advertise each available address:</p>
  194. <pre><code class="language-yaml">relay_ipv4_addr: &quot;203.0.113.4&quot; # The server's public IPv4 address.
  195. relay_ipv6_addr: &quot;2001:db8::4&quot; # The server's public IPv6 address (optional).
  196. </code></pre>
  197. <p>When advertising an external IPv6 address, ensure that the firewall and
  198. network settings of the system running your TURN server are configured to
  199. accept IPv6 traffic, and that the TURN server is listening on the local
  200. IPv6 address that is mapped by NAT to the external IPv6 address.</p>
  201. </li>
  202. <li>
  203. <p>Logging</p>
  204. <p>If <code>eturnal</code> was started by systemd, log files are written into the
  205. <code>/var/log/eturnal</code> directory by default. In order to log to the <a href="https://www.freedesktop.org/software/systemd/man/systemd-journald.service.html">journal</a>
  206. instead, the <code>log_dir</code> option can be set to <code>stdout</code> in the configuration file.</p>
  207. </li>
  208. <li>
  209. <p>Security considerations</p>
  210. <p>Consider your security settings. TURN lets users request a relay which will
  211. connect to arbitrary IP addresses and ports. The following configuration is
  212. suggested as a minimum starting point, <a href="https://eturnal.net/documentation/#blacklist">see also the official documentation</a>:</p>
  213. <pre><code class="language-yaml">## Reject TURN relaying from/to the following addresses/networks:
  214. blacklist: # This is the default blacklist.
  215. - &quot;127.0.0.0/8&quot; # IPv4 loopback.
  216. - &quot;::1&quot; # IPv6 loopback.
  217. - recommended # Expands to a number of networks recommended to be
  218. # blocked, but includes private networks. Those
  219. # would have to be 'whitelist'ed if eturnal serves
  220. # local clients/peers within such networks.
  221. </code></pre>
  222. <p>To whitelist IP addresses or specific (private) networks, you need to <strong>add</strong> a
  223. whitelist part into the configuration file, e.g.:</p>
  224. <pre><code class="language-yaml">whitelist:
  225. - &quot;192.168.0.0/16&quot;
  226. - &quot;203.0.113.113&quot;
  227. - &quot;2001:db8::/64&quot;
  228. </code></pre>
  229. <p>The more specific, the better.</p>
  230. </li>
  231. <li>
  232. <p>TURNS (TURN via TLS/DTLS)</p>
  233. <p>Also consider supporting TLS/DTLS. To do this, adjust the following settings
  234. in the <code>eturnal.yml</code> configuration file (TLS parts should not be commented anymore):</p>
  235. <pre><code class="language-yaml">listen:
  236. - ip: &quot;::&quot;
  237. port: 3478
  238. transport: udp
  239. - ip: &quot;::&quot;
  240. port: 3478
  241. transport: tcp
  242. - ip: &quot;::&quot;
  243. port: 5349
  244. transport: tls
  245. ## TLS certificate/key files (must be readable by 'eturnal' user!):
  246. tls_crt_file: /etc/eturnal/tls/crt.pem
  247. tls_key_file: /etc/eturnal/tls/key.pem
  248. </code></pre>
  249. <p>In this case, replace the <code>turn:</code> schemes in homeserver's <code>turn_uris</code> settings
  250. with <code>turns:</code>. More is described <a href="../../usage/configuration/config_documentation.html#turn_uris">here</a>.</p>
  251. <p>We recommend that you only try to set up TLS/DTLS once you have set up a
  252. basic installation and got it working.</p>
  253. <p>NB: If your TLS certificate was provided by Let's Encrypt, TLS/DTLS will
  254. not work with any Matrix client that uses Chromium's WebRTC library. This
  255. currently includes Element Android &amp; iOS; for more details, see their
  256. <a href="https://github.com/vector-im/element-android/issues/1533">respective</a>
  257. <a href="https://github.com/vector-im/element-ios/issues/2712">issues</a> as well as the underlying
  258. <a href="https://bugs.chromium.org/p/webrtc/issues/detail?id=11710">WebRTC issue</a>.
  259. Consider using a ZeroSSL certificate for your TURN server as a working alternative.</p>
  260. </li>
  261. <li>
  262. <p>Firewall</p>
  263. <p>Ensure your firewall allows traffic into the TURN server on the ports
  264. you've configured it to listen on (By default: 3478 and 5349 for TURN
  265. traffic (remember to allow both TCP and UDP traffic), and ports 49152-65535
  266. for the UDP relay.)</p>
  267. </li>
  268. <li>
  269. <p>Reload/ restarting <code>eturnal</code></p>
  270. <p>Changes in the configuration file require <code>eturnal</code> to reload/ restart, this
  271. can be achieved by:</p>
  272. <pre><code class="language-sh">eturnalctl reload
  273. </code></pre>
  274. <p><code>eturnal</code> performs a configuration check before actually reloading/ restarting
  275. and provides hints, if something is not correctly configured.</p>
  276. </li>
  277. </ol>
  278. <h3 id="eturnalctl-opterations-script"><a class="header" href="#eturnalctl-opterations-script">eturnalctl opterations script</a></h3>
  279. <p><code>eturnal</code> offers a handy <a href="https://eturnal.net/documentation/#Operation">operations script</a>
  280. which can be called e.g. to check, whether the service is up, to restart the service,
  281. to query how many active sessions exist, to change logging behaviour and so on.</p>
  282. <p>Hint: If <code>eturnalctl</code> is not part of your <code>$PATH</code>, consider either sym-linking it (e.g. ´ln -s /opt/eturnal/bin/eturnalctl /usr/local/bin/eturnalctl´) or call it from the default <code>eturnal</code> directory directly: e.g. <code>/opt/eturnal/bin/eturnalctl info</code></p>
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