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<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>
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<p>It is recommended to put a reverse proxy such as
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<a href="https://nginx.org/en/docs/http/ngx_http_proxy_module.html">nginx</a>,
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<a href="https://httpd.apache.org/docs/current/mod/mod_proxy_http.html">Apache</a>,
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<a href="https://caddyserver.com/docs/quick-starts/reverse-proxy">Caddy</a>,
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<a href="https://www.haproxy.org/">HAProxy</a> or
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<a href="https://man.openbsd.org/relayd.8">relayd</a> in front of Synapse. One advantage
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of doing so is that it means that you can expose the default https port
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(443) to Matrix clients without needing to run Synapse with root
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privileges.</p>
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<p>You should configure your reverse proxy to forward requests to <code>/_matrix</code> or
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<code>/_synapse/client</code> to Synapse, and have it set the <code>X-Forwarded-For</code> and
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<code>X-Forwarded-Proto</code> request headers.</p>
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<p>You should remember that Matrix clients and other Matrix servers do not
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necessarily need to connect to your server via the same server name or
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port. Indeed, clients will use port 443 by default, whereas servers default to
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port 8448. Where these are different, we refer to the 'client port' and the
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'federation port'. See <a href="https://matrix.org/docs/spec/server_server/latest#resolving-server-names">the Matrix
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specification</a>
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for more details of the algorithm used for federation connections, and
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<a href="delegate.html">Delegation</a> for instructions on setting up delegation.</p>
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<p><strong>NOTE</strong>: Your reverse proxy must not <code>canonicalise</code> or <code>normalise</code>
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the requested URI in any way (for example, by decoding <code>%xx</code> escapes).
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Beware that Apache <em>will</em> canonicalise URIs unless you specify
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<code>nocanon</code>.</p>
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<p>Let's assume that we expect clients to connect to our server at
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<code>https://matrix.example.com</code>, and other servers to connect at
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<code>https://example.com:8448</code>. The following sections detail the configuration of
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the reverse proxy and the homeserver.</p>
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<h2 id="homeserver-configuration"><a class="header" href="#homeserver-configuration">Homeserver Configuration</a></h2>
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<p>The HTTP configuration will need to be updated for Synapse to correctly record
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client IP addresses and generate redirect URLs while behind a reverse proxy. </p>
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<p>In <code>homeserver.yaml</code> set <code>x_forwarded: true</code> in the port 8008 section and
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consider setting <code>bind_addresses: ['127.0.0.1']</code> so that the server only
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listens to traffic on localhost. (Do not change <code>bind_addresses</code> to <code>127.0.0.1</code>
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when using a containerized Synapse, as that will prevent it from responding
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to proxied traffic.)</p>
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<h2 id="reverse-proxy-configuration-examples"><a class="header" href="#reverse-proxy-configuration-examples">Reverse-proxy configuration examples</a></h2>
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<p><strong>NOTE</strong>: You only need one of these.</p>
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<h3 id="nginx"><a class="header" href="#nginx">nginx</a></h3>
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<pre><code class="language-nginx">server {
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listen 443 ssl http2;
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listen [::]:443 ssl http2;
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# For the federation port
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listen 8448 ssl http2 default_server;
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listen [::]:8448 ssl http2 default_server;
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server_name matrix.example.com;
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location ~ ^(/_matrix|/_synapse/client) {
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# note: do not add a path (even a single /) after the port in `proxy_pass`,
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# otherwise nginx will canonicalise the URI and cause signature verification
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# errors.
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proxy_pass http://localhost:8008;
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proxy_set_header X-Forwarded-For $remote_addr;
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proxy_set_header X-Forwarded-Proto $scheme;
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proxy_set_header Host $host;
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# Nginx by default only allows file uploads up to 1M in size
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# Increase client_max_body_size to match max_upload_size defined in homeserver.yaml
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client_max_body_size 50M;
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}
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}
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</code></pre>
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<h3 id="caddy-v1"><a class="header" href="#caddy-v1">Caddy v1</a></h3>
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<pre><code>matrix.example.com {
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proxy /_matrix http://localhost:8008 {
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transparent
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}
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proxy /_synapse/client http://localhost:8008 {
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transparent
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}
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}
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example.com:8448 {
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proxy / http://localhost:8008 {
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transparent
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}
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}
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</code></pre>
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<h3 id="caddy-v2"><a class="header" href="#caddy-v2">Caddy v2</a></h3>
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<pre><code>matrix.example.com {
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reverse_proxy /_matrix/* http://localhost:8008
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reverse_proxy /_synapse/client/* http://localhost:8008
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}
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example.com:8448 {
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reverse_proxy http://localhost:8008
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}
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</code></pre>
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<p><a href="delegate.html">Delegation</a> example:</p>
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<pre><code>(matrix-well-known-header) {
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# Headers
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header Access-Control-Allow-Origin "*"
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header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS"
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header Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Accept, Authorization"
|
|
header Content-Type "application/json"
|
|
}
|
|
|
|
example.com {
|
|
handle /.well-known/matrix/server {
|
|
import matrix-well-known-header
|
|
respond `{"m.server":"matrix.example.com:443"}`
|
|
}
|
|
|
|
handle /.well-known/matrix/client {
|
|
import matrix-well-known-header
|
|
respond `{"m.homeserver":{"base_url":"https://matrix.example.com"},"m.identity_server":{"base_url":"https://identity.example.com"}}`
|
|
}
|
|
}
|
|
|
|
matrix.example.com {
|
|
reverse_proxy /_matrix/* http://localhost:8008
|
|
reverse_proxy /_synapse/client/* http://localhost:8008
|
|
}
|
|
</code></pre>
|
|
<h3 id="apache"><a class="header" href="#apache">Apache</a></h3>
|
|
<pre><code class="language-apache"><VirtualHost *:443>
|
|
SSLEngine on
|
|
ServerName matrix.example.com
|
|
|
|
RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
|
|
AllowEncodedSlashes NoDecode
|
|
ProxyPreserveHost on
|
|
ProxyPass /_matrix http://127.0.0.1:8008/_matrix nocanon
|
|
ProxyPassReverse /_matrix http://127.0.0.1:8008/_matrix
|
|
ProxyPass /_synapse/client http://127.0.0.1:8008/_synapse/client nocanon
|
|
ProxyPassReverse /_synapse/client http://127.0.0.1:8008/_synapse/client
|
|
</VirtualHost>
|
|
|
|
<VirtualHost *:8448>
|
|
SSLEngine on
|
|
ServerName example.com
|
|
|
|
RequestHeader set "X-Forwarded-Proto" expr=%{REQUEST_SCHEME}
|
|
AllowEncodedSlashes NoDecode
|
|
ProxyPass /_matrix http://127.0.0.1:8008/_matrix nocanon
|
|
ProxyPassReverse /_matrix http://127.0.0.1:8008/_matrix
|
|
</VirtualHost>
|
|
</code></pre>
|
|
<p><strong>NOTE</strong>: ensure the <code>nocanon</code> options are included.</p>
|
|
<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></VirtualHost></code> above:</p>
|
|
<pre><code class="language-apache"><IfModule security2_module>
|
|
SecRuleEngine off
|
|
</IfModule>
|
|
</code></pre>
|
|
<p><strong>NOTE 3</strong>: Missing <code>ProxyPreserveHost on</code> can lead to a redirect loop.</p>
|
|
<h3 id="haproxy"><a class="header" href="#haproxy">HAProxy</a></h3>
|
|
<pre><code>frontend https
|
|
bind *:443,[::]:443 ssl crt /etc/ssl/haproxy/ strict-sni alpn h2,http/1.1
|
|
http-request set-header X-Forwarded-Proto https if { ssl_fc }
|
|
http-request set-header X-Forwarded-Proto http if !{ ssl_fc }
|
|
http-request set-header X-Forwarded-For %[src]
|
|
|
|
# Matrix client traffic
|
|
acl matrix-host hdr(host) -i matrix.example.com matrix.example.com:443
|
|
acl matrix-path path_beg /_matrix
|
|
acl matrix-path path_beg /_synapse/client
|
|
|
|
use_backend matrix if matrix-host matrix-path
|
|
|
|
frontend matrix-federation
|
|
bind *:8448,[::]:8448 ssl crt /etc/ssl/haproxy/synapse.pem alpn h2,http/1.1
|
|
http-request set-header X-Forwarded-Proto https if { ssl_fc }
|
|
http-request set-header X-Forwarded-Proto http if !{ ssl_fc }
|
|
http-request set-header X-Forwarded-For %[src]
|
|
|
|
default_backend matrix
|
|
|
|
backend matrix
|
|
server matrix 127.0.0.1:8008
|
|
</code></pre>
|
|
<p><a href="delegate.html">Delegation</a> example:</p>
|
|
<pre><code>frontend https
|
|
acl matrix-well-known-client-path path /.well-known/matrix/client
|
|
acl matrix-well-known-server-path path /.well-known/matrix/server
|
|
use_backend matrix-well-known-client if matrix-well-known-client-path
|
|
use_backend matrix-well-known-server if matrix-well-known-server-path
|
|
|
|
backend matrix-well-known-client
|
|
http-after-response set-header Access-Control-Allow-Origin "*"
|
|
http-after-response set-header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS"
|
|
http-after-response set-header Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Accept, Authorization"
|
|
http-request return status 200 content-type application/json string '{"m.homeserver":{"base_url":"https://matrix.example.com"},"m.identity_server":{"base_url":"https://identity.example.com"}}'
|
|
|
|
backend matrix-well-known-server
|
|
http-after-response set-header Access-Control-Allow-Origin "*"
|
|
http-after-response set-header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS"
|
|
http-after-response set-header Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Accept, Authorization"
|
|
http-request return status 200 content-type application/json string '{"m.server":"matrix.example.com:443"}'
|
|
</code></pre>
|
|
<h3 id="relayd"><a class="header" href="#relayd">Relayd</a></h3>
|
|
<pre><code>table <webserver> { 127.0.0.1 }
|
|
table <matrixserver> { 127.0.0.1 }
|
|
|
|
http protocol "https" {
|
|
tls { no tlsv1.0, ciphers "HIGH" }
|
|
tls keypair "example.com"
|
|
match header set "X-Forwarded-For" value "$REMOTE_ADDR"
|
|
match header set "X-Forwarded-Proto" value "https"
|
|
|
|
# set CORS header for .well-known/matrix/server, .well-known/matrix/client
|
|
# httpd does not support setting headers, so do it here
|
|
match request path "/.well-known/matrix/*" tag "matrix-cors"
|
|
match response tagged "matrix-cors" header set "Access-Control-Allow-Origin" value "*"
|
|
|
|
pass quick path "/_matrix/*" forward to <matrixserver>
|
|
pass quick path "/_synapse/client/*" forward to <matrixserver>
|
|
|
|
# pass on non-matrix traffic to webserver
|
|
pass forward to <webserver>
|
|
}
|
|
|
|
relay "https_traffic" {
|
|
listen on egress port 443 tls
|
|
protocol "https"
|
|
forward to <matrixserver> port 8008 check tcp
|
|
forward to <webserver> port 8080 check tcp
|
|
}
|
|
|
|
http protocol "matrix" {
|
|
tls { no tlsv1.0, ciphers "HIGH" }
|
|
tls keypair "example.com"
|
|
block
|
|
pass quick path "/_matrix/*" forward to <matrixserver>
|
|
pass quick path "/_synapse/client/*" forward to <matrixserver>
|
|
}
|
|
|
|
relay "matrix_federation" {
|
|
listen on egress port 8448 tls
|
|
protocol "matrix"
|
|
forward to <matrixserver> port 8008 check tcp
|
|
}
|
|
</code></pre>
|
|
<h2 id="health-check-endpoint"><a class="header" href="#health-check-endpoint">Health check endpoint</a></h2>
|
|
<p>Synapse exposes a health check endpoint for use by reverse proxies.
|
|
Each configured HTTP listener has a <code>/health</code> endpoint which always returns
|
|
200 OK (and doesn't get logged).</p>
|
|
<h2 id="synapse-administration-endpoints"><a class="header" href="#synapse-administration-endpoints">Synapse administration endpoints</a></h2>
|
|
<p>Endpoints for administering your Synapse instance are placed under
|
|
<code>/_synapse/admin</code>. These require authentication through an access token of an
|
|
admin user. However as access to these endpoints grants the caller a lot of power,
|
|
we do not recommend exposing them to the public internet without good reason.</p>
|
|
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|
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