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-ACME
-====
-
-Synapse v1.0 requires that federation TLS certificates are verifiable by a
-trusted root CA. If you do not already have a valid certificate for your domain, the easiest
-way to get one is with Synapse's new ACME support, which will use the ACME
-protocol to provision a certificate automatically. By default, certificates
-will be obtained from the publicly trusted CA Let's Encrypt.
-
-For a sample configuration, please inspect the new ACME section in the example
-generated config by running the ``generate-config`` executable. For example::
-
-  ~/synapse/env3/bin/generate-config
-
-You will need to provide Let's Encrypt (or another ACME provider) access to
-your Synapse ACME challenge responder on port 80, at the domain of your
-homeserver. This requires you to either change the port of the ACME listener
-provided by Synapse to a high port and reverse proxy to it, or use a tool
-like ``authbind`` to allow Synapse to listen on port 80 without root access.
-(Do not run Synapse with root permissions!) Detailed instructions are
-available under "ACME setup" below.
-
-If you are already using self-signed certificates, you will need to back up
-or delete them (files ``example.com.tls.crt`` and ``example.com.tls.key`` in
-Synapse's root directory), Synapse's ACME implementation will not overwrite
-them.
-
-You may wish to use alternate methods such as Certbot to obtain a certificate
-from Let's Encrypt, depending on your server configuration. Of course, if you
-already have a valid certificate for your homeserver's domain, that can be
-placed in Synapse's config directory without the need for any ACME setup.
-
-ACME setup
-----------
-
-Synapse v1.0 will require valid TLS certificates for communication between servers
-(port ``8448`` by default) in addition to those that are client-facing (port
-``443``). In the case that your `server_name` config variable is the same as
-the hostname that the client connects to, then the same certificate can be
-used between client and federation ports without issue. Synapse v0.99.0+
-will provision server-to-server certificates automatically for you for
-free through `Let's Encrypt
-<https://letsencrypt.org/>`_ if you tell it to.
-
-In order for Synapse to complete the ACME challenge to provision a
-certificate, it needs access to port 80. Typically listening on port 80 is
-only granted to applications running as root. There are thus two solutions to
-this problem.
-
-**Using a reverse proxy**
-
-A reverse proxy such as Apache or nginx allows a single process (the web
-server) to listen on port 80 and proxy traffic to the appropriate program
-running on your server. It is the recommended method for setting up ACME as
-it allows you to use your existing webserver while also allowing Synapse to
-provision certificates as needed.
-
-For nginx users, add the following line to your existing ``server`` block::
-
-    location /.well-known/acme-challenge {
-        proxy_pass http://localhost:8009/;
-    }
-
-For Apache, add the following to your existing webserver config::
-
-    ProxyPass /.well-known/acme-challenge http://localhost:8009/.well-known/acme-challenge
-
-Make sure to restart/reload your webserver after making changes.
-
-
-**Authbind**
-
-``authbind`` allows a program which does not run as root to bind to
-low-numbered ports in a controlled way. The setup is simpler, but requires a
-webserver not to already be running on port 80. **This includes every time
-Synapse renews a certificate**, which may be cumbersome if you usually run a
-web server on port 80. Nevertheless, if you're sure port 80 is not being used
-for any other purpose then all that is necessary is the following:
-
-Install ``authbind``. For example, on Debian/Ubuntu::
-
-    sudo apt-get install authbind
-
-Allow ``authbind`` to bind port 80::
-
-    sudo touch /etc/authbind/byport/80
-    sudo chmod 777 /etc/authbind/byport/80
-
-When Synapse is started, use the following syntax::
-
-    authbind --deep <synapse start command>
-
-Finally, once Synapse's is able to listen on port 80 for ACME challenge
-requests, it must be told to perform ACME provisioning by setting ``enabled``
-to true under the ``acme`` section in ``homeserver.yaml``::
-
-    acme:
-        enabled: true