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1 files changed, 45 insertions, 37 deletions
diff --git a/docs/delegate.md b/docs/delegate.md index f3f89075d1..ee9cbb3b1c 100644 --- a/docs/delegate.md +++ b/docs/delegate.md @@ -1,4 +1,8 @@ -# Delegation +# Delegation of incoming federation traffic + +In the following documentation, we use the term `server_name` to refer to that setting +in your homeserver configuration file. It appears at the ends of user ids, and tells +other homeservers where they can find your server. By default, other homeservers will expect to be able to reach yours via your `server_name`, on port 8448. For example, if you set your `server_name` @@ -12,13 +16,21 @@ to a different server and/or port (e.g. `synapse.example.com:443`). ## .well-known delegation -To use this method, you need to be able to alter the -`server_name` 's https server to serve the `/.well-known/matrix/server` -URL. Having an active server (with a valid TLS certificate) serving your -`server_name` domain is out of the scope of this documentation. +To use this method, you need to be able to configure the server at +`https://<server_name>` to serve a file at +`https://<server_name>/.well-known/matrix/server`. There are two ways to do this, shown below. + +Note that the `.well-known` file is hosted on the default port for `https` (port 443). + +### External server + +For maximum flexibility, you need to configure an external server such as nginx, Apache +or HAProxy to serve the `https://<server_name>/.well-known/matrix/server` file. Setting +up such a server is out of the scope of this documentation, but note that it is often +possible to configure your [reverse proxy](reverse_proxy.md) for this. -The URL `https://<server_name>/.well-known/matrix/server` should -return a JSON structure containing the key `m.server` like so: +The URL `https://<server_name>/.well-known/matrix/server` should be configured +return a JSON structure containing the key `m.server` like this: ```json { @@ -26,8 +38,9 @@ return a JSON structure containing the key `m.server` like so: } ``` -In our example, this would mean that URL `https://example.com/.well-known/matrix/server` -should return: +In our example (where we want federation traffic to be routed to +`https://synapse.example.com`, on port 443), this would mean that +`https://example.com/.well-known/matrix/server` should return: ```json { @@ -38,16 +51,29 @@ should return: Note, specifying a port is optional. If no port is specified, then it defaults to 8448. -With .well-known delegation, federating servers will check for a valid TLS -certificate for the delegated hostname (in our example: `synapse.example.com`). +### Serving a `.well-known/matrix/server` file with Synapse + +If you are able to set up your domain so that `https://<server_name>` is routed to +Synapse (i.e., the only change needed is to direct federation traffic to port 443 +instead of port 8448), then it is possible to configure Synapse to serve a suitable +`.well-known/matrix/server` file. To do so, add the following to your `homeserver.yaml` +file: + +```yaml +serve_server_wellknown: true +``` + +**Note**: this *only* works if `https://<server_name>` is routed to Synapse, so is +generally not suitable if Synapse is hosted at a subdomain such as +`https://synapse.example.com`. ## SRV DNS record delegation -It is also possible to do delegation using a SRV DNS record. However, that is -considered an advanced topic since it's a bit complex to set up, and `.well-known` -delegation is already enough in most cases. +It is also possible to do delegation using a SRV DNS record. However, that is generally +not recommended, as it can be difficult to configure the TLS certificates correctly in +this case, and it offers little advantage over `.well-known` delegation. -However, if you really need it, you can find some documentation on how such a +However, if you really need it, you can find some documentation on what such a record should look like and how Synapse will use it in [the Matrix specification](https://matrix.org/docs/spec/server_server/latest#resolving-server-names). @@ -68,27 +94,9 @@ wouldn't need any delegation set up. domain `server_name` points to, you will need to let other servers know how to find it using delegation. -### Do you still recommend against using a reverse proxy on the federation port? - -We no longer actively recommend against using a reverse proxy. Many admins will -find it easier to direct federation traffic to a reverse proxy and manage their -own TLS certificates, and this is a supported configuration. +### Should I use a reverse proxy for federation traffic? -See [the reverse proxy documentation](reverse_proxy.md) for information on setting up a +Generally, using a reverse proxy for both the federation and client traffic is a good +idea, since it saves handling TLS traffic in Synapse. See +[the reverse proxy documentation](reverse_proxy.md) for information on setting up a reverse proxy. - -### Do I still need to give my TLS certificates to Synapse if I am using a reverse proxy? - -This is no longer necessary. If you are using a reverse proxy for all of your -TLS traffic, then you can set `no_tls: True` in the Synapse config. - -In that case, the only reason Synapse needs the certificate is to populate a legacy -`tls_fingerprints` field in the federation API. This is ignored by Synapse 0.99.0 -and later, and the only time pre-0.99 Synapses will check it is when attempting to -fetch the server keys - and generally this is delegated via `matrix.org`, which -is running a modern version of Synapse. - -### Do I need the same certificate for the client and federation port? - -No. There is nothing stopping you from using different certificates, -particularly if you are using a reverse proxy. |