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Update ACME.md to mention ACME v1 deprecation

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Brendan Abolivier 2020-02-12 20:14:16 +00:00
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# ACME
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`). 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. 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.
From version 1.0 (June 2019) onwards, Synapse requires valid TLS
certificates for communication between servers (by default on port
`8448`) in addition to those that are client-facing (port `443`). To
help homeserver admins fulfil this new requirement, Synapse v0.99.0
introduced support for automatically provisioning certificates through
[Let's Encrypt](https://letsencrypt.org/) using the ACME protocol.
## Deprecation of ACME v1
In [March 2019](https://community.letsencrypt.org/t/end-of-life-plan-for-acmev1/88430),
Let's Encrypt announced that they were deprecating version 1 of the ACME
protocol, with the plan to disable the use of it for new accounts in
November 2019, and for existing accounts in June 2020.
Synapse doesn't currently support version 2 of the ACME protocol, which
means that:
* for existing installs, Synapse's built-in ACME support will continue
to work until June 2020.
* for new installs, this feature will not work at all.
Either way, it is recommended to move from Synapse's ACME support
feature to an external automated tool such as [certbot](https://github.com/certbot/certbot)
(or browse [this list](https://letsencrypt.org/fr/docs/client-options/)
for an alternative ACME client).
It's also recommended to use a reverse proxy for the server-facing
communications (mode documentation about this can be found
[here](/docs/reverse_proxy.md)) as well as the client-facing ones and
have it serve the certificates.
In case you can't do that and need Synapse to serve them itself, make
sure to set the `tls_certificate_path` configuration setting to the path
of the certificate (make sure to use the certificate containing the full
certification chain, e.g. `fullchain.pem` if using certbot) and
`tls_private_key_path` to the path of the matching private key.
If you still want to use Synapse's built-in ACME support, the rest of
this document explains how to set it up.
## Initial setup
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