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Add notes on SRV and .well-known (#4573)
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Richard van der Hoff
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@ -19,19 +19,9 @@ certificate.** Admins will have 1 month to do so, after which 1.0.0 will be
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released and those servers without a valid certificate will not longer be able
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to federate with >= 1.0.0 servers.
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If you are unable to generate a valid TLS certificate for your server (e.g.
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because you run it on behalf of someone who doesn't want to give you a TLS
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certificate for their domain, or simply because the matrix domain is hosted on
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a different server), then you can now create a /.well-known/matrix/server file
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on the matrix domain in order to delegate Matrix hosting to another domain.
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Admins who currently use SRV records to delegate a domain **which they do not
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control TLS for** will need to switch to using .well-known/matrix/server - though
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they should retain their SRV record while the federation upgrades over the
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course of the month. Other SRV records are unaffected.
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Full upgrade notes can be found in
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[UPGRADE.rst](https://github.com/matrix-org/synapse/blob/master/UPGRADE.rst).
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What follows is a timeline and some frequently asked questions.
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Full details on how to carry out this configuration change is given
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[below](#configuring-certificates-for-compatibility-with-synapse-100). A
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timeline and some frequently asked questions are also given below.
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For more details and context on the release of the r0.1 Server/Server API and
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imminent Matrix 1.0 release, you can also see our
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@ -39,25 +29,26 @@ imminent Matrix 1.0 release, you can also see our
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## Contents
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* Timeline
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* Synapse 0.99.0 has just been released, what do I need to do right now?
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* How do I upgrade?
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* What will happen if I do not set up a valid federation certificate
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immediately?
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* What will happen if I do nothing at all?
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* When do I need a SRV record or .well-known URI?
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* Can I still use an SRV record?
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* I have created a .well-known URI. Do I still need an SRV record?
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* It used to work just fine, why are you breaking everything?
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* Can I manage my own certificates rather than having Synapse renew
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certificates itself?
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* Do you still recommend against using a reverse-proxy on the federation port?
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* Do I still need to give my TLS certificates to Synapse if I am using a
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reverse-proxy?
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* Do I need the same certificate for the client and federation port?
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* How do I tell Synapse to reload my keys/certificates after I replace them?
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* Configuring certificates for compatibility with Synapse 1.0
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* FAQ
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* Synapse 0.99.0 has just been released, what do I need to do right now?
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* How do I upgrade?
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* What will happen if I do not set up a valid federation certificate
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immediately?
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* What will happen if I do nothing at all?
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* When do I need a SRV record or .well-known URI?
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* Can I still use an SRV record?
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* I have created a .well-known URI. Do I still need an SRV record?
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* It used to work just fine, why are you breaking everything?
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* Can I manage my own certificates rather than having Synapse renew
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certificates itself?
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* Do you still recommend against using a reverse-proxy on the federation port?
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* Do I still need to give my TLS certificates to Synapse if I am using a
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reverse-proxy?
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* Do I need the same certificate for the client and federation port?
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* How do I tell Synapse to reload my keys/certificates after I replace them?
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### Timeline
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## Timeline
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**5th Feb 2019 - Synapse 0.99.0 is released.**
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@ -82,10 +73,96 @@ alongside their .well-known record.
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1.0.0 will land no sooner than 1 month after 0.99.0, leaving server admins one
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month after 5th February to upgrade to 0.99.0 and deploy their certificates. In
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accordance with the the [S2S spec](https://matrix.org/docs/spec/server_server/r0.1.0.html)
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1.0.0 will enforce federation checks. This means that any homeserver without a
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1.0.0 will enforce certificate validity. This means that any homeserver without a
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valid certificate after this point will no longer be able to federate with
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1.0.0 servers.
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## Configuring certificates for compatibility with Synapse 1.0.0
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### If you do not currently have an SRV record
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In this case, your `server_name` points to the host where your Synapse is
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running. There is no need to create a `.well-known` URI or an SRV record, but
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you will need to give Synapse a valid, signed, certificate.
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The easiest way to do that is with Synapse's built-in ACME (Let's Encrypt)
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support. Full details are in [ACME.md](./ACME.md) but, in a nutshell:
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1. Allow Synapse to listen on port 80 with `authbind`, or forward it from a
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reverse proxy.
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2. Enable acme support in `homeserver.yaml`.
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3. Move your old certificates out of the way.
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4. Restart Synapse.
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### If you do have an SRV record currently
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If you are using an SRV record, your matrix domain (`server_name`) may not
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point to the same host that your Synapse is running on (the 'target
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domain'). (If it does, you can follow the recommendation above; otherwise, read
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on.)
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Let's assume that your `server_name` is `example.com`, and your Synapse is
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hosted at a target domain of `customer.example.net`. Currently you should have
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an SRV record which looks like:
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```
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_matrix._tcp.example.com. IN SRV 10 5 443 customer.example.net.
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```
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In this situation, you have two choices for how to proceed:
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#### Option 1: give Synapse a certificate for your matrix domain
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Synapse 1.0 will expect your server to present a TLS certificate for your
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`server_name` (`example.com` in the above example). You can achieve this by
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doing one of the following:
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* Acquire a certificate for the `server_name` yourself (for example, using
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`certbot`), and give it and the key to Synapse via `tls_certificate_path`
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and `tls_private_key_path`, or:
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* Use Synapse's [ACME support](./ACME.md), and forward port 80 on the
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`server_name` domain to your Synapse instance, or:
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* Set up a reverse-proxy on port 8448 on the `server_name` domain, which
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forwards to Synapse. Once it is set up, you can remove the SRV record.
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#### Option 2: add a .well-known file to delegate your matrix traffic
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This will allow you to keep Synapse on a separate domain, without having to
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give it a certificate for the matrix domain.
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You can do this with a `.well-known` file as follows:
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1. Keep the SRV record in place - it is needed for backwards compatibility
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with Synapse 0.34 and earlier.
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2. Give synapse a certificate corresponding to the target domain
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(`customer.example.net` in the above example). Currently Synapse's ACME
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support [does not support
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this](https://github.com/matrix-org/synapse/issues/4552), so you will have
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to acquire a certificate yourself and give it to Synapse via
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`tls_certificate_path` and `tls_private_key_path`.
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3. Restart Synapse to ensure the new certificate is loaded.
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4. Arrange for a `.well-known` file at
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`https://<server_name>/.well-known/matrix/server` with contents:
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```json
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{"m.server": "<target domain>:<port>"}
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```
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In the above example, `https://example.com/.well-known/matrix/server`
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should have the contents:
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```json
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{"m.server": "customer.example.net:443"}
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```
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## FAQ
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### Synapse 0.99.0 has just been released, what do I need to do right now?
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Upgrade as soon as you can in preparation for Synapse 1.0.0.
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@ -126,14 +203,13 @@ other servers know how to find it.
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The easiest way to do this is with a .well-known/matrix/server URI on the
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webroot of the domain to advertise your server. For instance, if you ran
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"matrixhosting.com" and you were hosting a Matrix server for example.com, you
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would ask example.com to create a file at:
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"matrixhosting.com" and you were hosting a Matrix server for `example.com`, you
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would ask `example.com` to create a file at
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`https://example.com/.well-known/matrix/server` with contents:
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`https://example.com/.well-known/matrix/server`
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with contents:
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`{"m.server": "example.matrixhosting.com:8448"}`
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```json
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{"m.server": "example.matrixhosting.com:8448"}
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```
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...which would tell servers trying to connect to example.com to instead connect
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to example.matrixhosting.com on port 8448. You would then configure Synapse
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@ -231,7 +307,7 @@ 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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### Do I still need to give my TLS certificates to Synapse if I am using a 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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Practically speaking, this is no longer necessary.
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