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Our documentation has a history of using a document's name as a way to link to it, such as "See [workers.md]() for details". This makes sense when you're traversing a directory of files, but less sense when the files are abstracted away - as they are on the documentation website. This PR changes the links to various documentation pages to something that fits better into the surrounding sentence, as you would when making any hyperlink on the web.
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3.8 KiB
Markdown
94 lines
No EOL
3.8 KiB
Markdown
# Delegation
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By default, other homeservers will expect to be able to reach yours via
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your `server_name`, on port 8448. For example, if you set your `server_name`
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to `example.com` (so that your user names look like `@user:example.com`),
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other servers will try to connect to yours at `https://example.com:8448/`.
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Delegation is a Matrix feature allowing a homeserver admin to retain a
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`server_name` of `example.com` so that user IDs, room aliases, etc continue
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to look like `*:example.com`, whilst having federation traffic routed
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to a different server and/or port (e.g. `synapse.example.com:443`).
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## .well-known delegation
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To use this method, you need to be able to alter the
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`server_name` 's https server to serve the `/.well-known/matrix/server`
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URL. Having an active server (with a valid TLS certificate) serving your
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`server_name` domain is out of the scope of this documentation.
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The URL `https://<server_name>/.well-known/matrix/server` should
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return a JSON structure containing the key `m.server` like so:
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```json
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{
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"m.server": "<synapse.server.name>[:<yourport>]"
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}
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```
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In our example, this would mean that URL `https://example.com/.well-known/matrix/server`
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should return:
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```json
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{
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"m.server": "synapse.example.com:443"
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}
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```
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Note, specifying a port is optional. If no port is specified, then it defaults
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to 8448.
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With .well-known delegation, federating servers will check for a valid TLS
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certificate for the delegated hostname (in our example: `synapse.example.com`).
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## SRV DNS record delegation
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It is also possible to do delegation using a SRV DNS record. However, that is
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considered an advanced topic since it's a bit complex to set up, and `.well-known`
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delegation is already enough in most cases.
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However, if you really need it, you can find some documentation on how such a
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record should look like and how Synapse will use it in [the Matrix
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specification](https://matrix.org/docs/spec/server_server/latest#resolving-server-names).
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## Delegation FAQ
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### When do I need delegation?
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If your homeserver's APIs are accessible on the default federation port (8448)
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and the domain your `server_name` points to, you do not need any delegation.
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For instance, if you registered `example.com` and pointed its DNS A record at a
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fresh server, you could install Synapse on that host, giving it a `server_name`
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of `example.com`, and once a reverse proxy has been set up to proxy all requests
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sent to the port `8448` and serve TLS certificates for `example.com`, you
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wouldn't need any delegation set up.
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**However**, if your homeserver's APIs aren't accessible on port 8448 and on the
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domain `server_name` points to, you will need to let other servers know how to
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find it using delegation.
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### Do you still recommend against using a reverse proxy on the federation port?
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We no longer actively recommend against using a reverse proxy. Many admins will
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find it easier to direct federation traffic to a reverse proxy and manage their
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own TLS certificates, and this is a supported configuration.
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See [the reverse proxy documentation](reverse_proxy.md) for information on setting up a
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reverse proxy.
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### Do I still need to give my TLS certificates to Synapse if I am using a reverse proxy?
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This is no longer necessary. If you are using a reverse proxy for all of your
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TLS traffic, then you can set `no_tls: True` in the Synapse config.
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In that case, the only reason Synapse needs the certificate is to populate a legacy
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`tls_fingerprints` field in the federation API. This is ignored by Synapse 0.99.0
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and later, and the only time pre-0.99 Synapses will check it is when attempting to
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fetch the server keys - and generally this is delegated via `matrix.org`, which
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is running a modern version of Synapse.
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### Do I need the same certificate for the client and federation port?
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No. There is nothing stopping you from using different certificates,
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particularly if you are using a reverse proxy. |