reverse_proxy.html 30 KB

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  149. <h1 id="using-a-reverse-proxy-with-synapse"><a class="header" href="#using-a-reverse-proxy-with-synapse">Using a reverse proxy with Synapse</a></h1>
  150. <p>It is recommended to put a reverse proxy such as
  151. <a href="https://nginx.org/en/docs/http/ngx_http_proxy_module.html">nginx</a>,
  152. <a href="https://httpd.apache.org/docs/current/mod/mod_proxy_http.html">Apache</a>,
  153. <a href="https://caddyserver.com/docs/quick-starts/reverse-proxy">Caddy</a>,
  154. <a href="https://www.haproxy.org/">HAProxy</a> or
  155. <a href="https://man.openbsd.org/relayd.8">relayd</a> in front of Synapse. One advantage
  156. of doing so is that it means that you can expose the default https port
  157. (443) to Matrix clients without needing to run Synapse with root
  158. privileges.</p>
  159. <p>You should configure your reverse proxy to forward requests to <code>/_matrix</code> or
  160. <code>/_synapse/client</code> to Synapse, and have it set the <code>X-Forwarded-For</code> and
  161. <code>X-Forwarded-Proto</code> request headers.</p>
  162. <p>You should remember that Matrix clients and other Matrix servers do not
  163. necessarily need to connect to your server via the same server name or
  164. port. Indeed, clients will use port 443 by default, whereas servers default to
  165. port 8448. Where these are different, we refer to the 'client port' and the
  166. 'federation port'. See <a href="https://matrix.org/docs/spec/server_server/latest#resolving-server-names">the Matrix
  167. specification</a>
  168. for more details of the algorithm used for federation connections, and
  169. <a href="delegate.html">Delegation</a> for instructions on setting up delegation.</p>
  170. <p><strong>NOTE</strong>: Your reverse proxy must not <code>canonicalise</code> or <code>normalise</code>
  171. the requested URI in any way (for example, by decoding <code>%xx</code> escapes).
  172. Beware that Apache <em>will</em> canonicalise URIs unless you specify
  173. <code>nocanon</code>.</p>
  174. <p>Let's assume that we expect clients to connect to our server at
  175. <code>https://matrix.example.com</code>, and other servers to connect at
  176. <code>https://example.com:8448</code>. The following sections detail the configuration of
  177. the reverse proxy and the homeserver.</p>
  178. <h2 id="homeserver-configuration"><a class="header" href="#homeserver-configuration">Homeserver Configuration</a></h2>
  179. <p>The HTTP configuration will need to be updated for Synapse to correctly record
  180. client IP addresses and generate redirect URLs while behind a reverse proxy. </p>
  181. <p>In <code>homeserver.yaml</code> set <code>x_forwarded: true</code> in the port 8008 section and
  182. consider setting <code>bind_addresses: ['127.0.0.1']</code> so that the server only
  183. listens to traffic on localhost. (Do not change <code>bind_addresses</code> to <code>127.0.0.1</code>
  184. when using a containerized Synapse, as that will prevent it from responding
  185. to proxied traffic.)</p>
  186. <h2 id="reverse-proxy-configuration-examples"><a class="header" href="#reverse-proxy-configuration-examples">Reverse-proxy configuration examples</a></h2>
  187. <p><strong>NOTE</strong>: You only need one of these.</p>
  188. <h3 id="nginx"><a class="header" href="#nginx">nginx</a></h3>
  189. <pre><code class="language-nginx">server {
  190. listen 443 ssl http2;
  191. listen [::]:443 ssl http2;
  192. # For the federation port
  193. listen 8448 ssl http2 default_server;
  194. listen [::]:8448 ssl http2 default_server;
  195. server_name matrix.example.com;
  196. location ~* ^(\/_matrix|\/_synapse\/client) {
  197. # note: do not add a path (even a single /) after the port in `proxy_pass`,
  198. # otherwise nginx will canonicalise the URI and cause signature verification
  199. # errors.
  200. proxy_pass http://localhost:8008;
  201. proxy_set_header X-Forwarded-For $remote_addr;
  202. proxy_set_header X-Forwarded-Proto $scheme;
  203. proxy_set_header Host $host;
  204. # Nginx by default only allows file uploads up to 1M in size
  205. # Increase client_max_body_size to match max_upload_size defined in homeserver.yaml
  206. client_max_body_size 50M;
  207. }
  208. }
  209. </code></pre>
  210. <h3 id="caddy-v1"><a class="header" href="#caddy-v1">Caddy v1</a></h3>
  211. <pre><code>matrix.example.com {
  212. proxy /_matrix http://localhost:8008 {
  213. transparent
  214. }
  215. proxy /_synapse/client http://localhost:8008 {
  216. transparent
  217. }
  218. }
  219. example.com:8448 {
  220. proxy / http://localhost:8008 {
  221. transparent
  222. }
  223. }
  224. </code></pre>
  225. <h3 id="caddy-v2"><a class="header" href="#caddy-v2">Caddy v2</a></h3>
  226. <pre><code>matrix.example.com {
  227. reverse_proxy /_matrix/* http://localhost:8008
  228. reverse_proxy /_synapse/client/* http://localhost:8008
  229. }
  230. example.com:8448 {
  231. reverse_proxy http://localhost:8008
  232. }
  233. </code></pre>
  234. <p><a href="delegate.html">Delegation</a> example:</p>
  235. <pre><code>(matrix-well-known-header) {
  236. # Headers
  237. header Access-Control-Allow-Origin &quot;*&quot;
  238. header Access-Control-Allow-Methods &quot;GET, POST, PUT, DELETE, OPTIONS&quot;
  239. header Access-Control-Allow-Headers &quot;Origin, X-Requested-With, Content-Type, Accept, Authorization&quot;
  240. header Content-Type &quot;application/json&quot;
  241. }
  242. example.com {
  243. handle /.well-known/matrix/server {
  244. import matrix-well-known-header
  245. respond `{&quot;m.server&quot;:&quot;matrix.example.com:443&quot;}`
  246. }
  247. handle /.well-known/matrix/client {
  248. import matrix-well-known-header
  249. respond `{&quot;m.homeserver&quot;:{&quot;base_url&quot;:&quot;https://matrix.example.com&quot;},&quot;m.identity_server&quot;:{&quot;base_url&quot;:&quot;https://identity.example.com&quot;}}`
  250. }
  251. }
  252. matrix.example.com {
  253. reverse_proxy /_matrix/* http://localhost:8008
  254. reverse_proxy /_synapse/client/* http://localhost:8008
  255. }
  256. </code></pre>
  257. <h3 id="apache"><a class="header" href="#apache">Apache</a></h3>
  258. <pre><code class="language-apache">&lt;VirtualHost *:443&gt;
  259. SSLEngine on
  260. ServerName matrix.example.com
  261. RequestHeader set &quot;X-Forwarded-Proto&quot; expr=%{REQUEST_SCHEME}
  262. AllowEncodedSlashes NoDecode
  263. ProxyPreserveHost on
  264. ProxyPass /_matrix http://127.0.0.1:8008/_matrix nocanon
  265. ProxyPassReverse /_matrix http://127.0.0.1:8008/_matrix
  266. ProxyPass /_synapse/client http://127.0.0.1:8008/_synapse/client nocanon
  267. ProxyPassReverse /_synapse/client http://127.0.0.1:8008/_synapse/client
  268. &lt;/VirtualHost&gt;
  269. &lt;VirtualHost *:8448&gt;
  270. SSLEngine on
  271. ServerName example.com
  272. RequestHeader set &quot;X-Forwarded-Proto&quot; expr=%{REQUEST_SCHEME}
  273. AllowEncodedSlashes NoDecode
  274. ProxyPass /_matrix http://127.0.0.1:8008/_matrix nocanon
  275. ProxyPassReverse /_matrix http://127.0.0.1:8008/_matrix
  276. &lt;/VirtualHost&gt;
  277. </code></pre>
  278. <p><strong>NOTE</strong>: ensure the <code>nocanon</code> options are included.</p>
  279. <p><strong>NOTE 2</strong>: It appears that Synapse is currently incompatible with the ModSecurity module for Apache (<code>mod_security2</code>). If you need it enabled for other services on your web server, you can disable it for Synapse's two VirtualHosts by including the following lines before each of the two <code>&lt;/VirtualHost&gt;</code> above:</p>
  280. <pre><code class="language-apache">&lt;IfModule security2_module&gt;
  281. SecRuleEngine off
  282. &lt;/IfModule&gt;
  283. </code></pre>
  284. <p><strong>NOTE 3</strong>: Missing <code>ProxyPreserveHost on</code> can lead to a redirect loop.</p>
  285. <h3 id="haproxy"><a class="header" href="#haproxy">HAProxy</a></h3>
  286. <pre><code>frontend https
  287. bind :::443 v4v6 ssl crt /etc/ssl/haproxy/ strict-sni alpn h2,http/1.1
  288. http-request set-header X-Forwarded-Proto https if { ssl_fc }
  289. http-request set-header X-Forwarded-Proto http if !{ ssl_fc }
  290. http-request set-header X-Forwarded-For %[src]
  291. # Matrix client traffic
  292. acl matrix-host hdr(host) -i matrix.example.com matrix.example.com:443
  293. acl matrix-path path_beg /_matrix
  294. acl matrix-path path_beg /_synapse/client
  295. use_backend matrix if matrix-host matrix-path
  296. frontend matrix-federation
  297. bind :::8448 v4v6 ssl crt /etc/ssl/haproxy/synapse.pem alpn h2,http/1.1
  298. http-request set-header X-Forwarded-Proto https if { ssl_fc }
  299. http-request set-header X-Forwarded-Proto http if !{ ssl_fc }
  300. http-request set-header X-Forwarded-For %[src]
  301. default_backend matrix
  302. backend matrix
  303. server matrix 127.0.0.1:8008
  304. </code></pre>
  305. <h3 id="relayd"><a class="header" href="#relayd">Relayd</a></h3>
  306. <pre><code>table &lt;webserver&gt; { 127.0.0.1 }
  307. table &lt;matrixserver&gt; { 127.0.0.1 }
  308. http protocol &quot;https&quot; {
  309. tls { no tlsv1.0, ciphers &quot;HIGH&quot; }
  310. tls keypair &quot;example.com&quot;
  311. match header set &quot;X-Forwarded-For&quot; value &quot;$REMOTE_ADDR&quot;
  312. match header set &quot;X-Forwarded-Proto&quot; value &quot;https&quot;
  313. # set CORS header for .well-known/matrix/server, .well-known/matrix/client
  314. # httpd does not support setting headers, so do it here
  315. match request path &quot;/.well-known/matrix/*&quot; tag &quot;matrix-cors&quot;
  316. match response tagged &quot;matrix-cors&quot; header set &quot;Access-Control-Allow-Origin&quot; value &quot;*&quot;
  317. pass quick path &quot;/_matrix/*&quot; forward to &lt;matrixserver&gt;
  318. pass quick path &quot;/_synapse/client/*&quot; forward to &lt;matrixserver&gt;
  319. # pass on non-matrix traffic to webserver
  320. pass forward to &lt;webserver&gt;
  321. }
  322. relay &quot;https_traffic&quot; {
  323. listen on egress port 443 tls
  324. protocol &quot;https&quot;
  325. forward to &lt;matrixserver&gt; port 8008 check tcp
  326. forward to &lt;webserver&gt; port 8080 check tcp
  327. }
  328. http protocol &quot;matrix&quot; {
  329. tls { no tlsv1.0, ciphers &quot;HIGH&quot; }
  330. tls keypair &quot;example.com&quot;
  331. block
  332. pass quick path &quot;/_matrix/*&quot; forward to &lt;matrixserver&gt;
  333. pass quick path &quot;/_synapse/client/*&quot; forward to &lt;matrixserver&gt;
  334. }
  335. relay &quot;matrix_federation&quot; {
  336. listen on egress port 8448 tls
  337. protocol &quot;matrix&quot;
  338. forward to &lt;matrixserver&gt; port 8008 check tcp
  339. }
  340. </code></pre>
  341. <h2 id="health-check-endpoint"><a class="header" href="#health-check-endpoint">Health check endpoint</a></h2>
  342. <p>Synapse exposes a health check endpoint for use by reverse proxies.
  343. Each configured HTTP listener has a <code>/health</code> endpoint which always returns
  344. 200 OK (and doesn't get logged).</p>
  345. <h2 id="synapse-administration-endpoints"><a class="header" href="#synapse-administration-endpoints">Synapse administration endpoints</a></h2>
  346. <p>Endpoints for administering your Synapse instance are placed under
  347. <code>/_synapse/admin</code>. These require authentication through an access token of an
  348. admin user. However as access to these endpoints grants the caller a lot of power,
  349. we do not recommend exposing them to the public internet without good reason.</p>
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