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Clean up portions of docs that talk about reversing fed port
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Andrew Morgan
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1 changed files with 24 additions and 97 deletions
121
README.rst
121
README.rst
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@ -212,27 +212,26 @@ key in the ``<server name>.signing.key`` file (the second word) to something
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different. See `the spec`__ for more information on key management.)
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.. __: `key_management`_
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The default configuration exposes two HTTP ports: 8008 and 8448. Port 8008 is
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configured without TLS; it should be behind a reverse proxy for TLS/SSL
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termination on port 443 which in turn should be used for clients. Port 8448
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is configured to use TLS with a self-signed certificate. If you would like
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to do initial test with a client without having to setup a reverse proxy,
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you can temporarly use another certificate. (Note that a self-signed
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certificate is fine for `Federation`_). You can do so by changing
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``tls_certificate_path`` and ``tls_private_key_path``
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in ``homeserver.yaml``; alternatively, you can use a reverse-proxy, but be sure
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to read `Using a reverse proxy with Synapse`_ when doing so.
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is configured to use TLS for `Federation`_ with a self-signed or verified
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certificate, but please be aware that a valid certificate will be required in
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Synapse v1.0.
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Apart from port 8448 using TLS, both ports are the same in the default
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configuration.
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If you would like to do initial testing with a client without having to setup
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a reverse proxy, you can temporarly use another certificate. You can do so by
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changing ``tls_certificate_path`` and ``tls_private_key_path`` in
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``homeserver.yaml``; alternatively, you can use a reverse-proxy, but be sure
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to read `Using a reverse proxy with Synapse`_ when doing so. Apart from port
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8448 using TLS, both ports are the same in the default configuration.
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ACME setup
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----------
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Synapse requires valid TLS certificates for communication between servers
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Synapse v1.0 requires valid TLS certificates for communication between servers
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(port ``8448`` by default) in addition to those that are client-facing (port
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``443``). Synapse **will provision server-to-server certificates
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``443``). Synapse v0.99.0+ **will provision server-to-server certificates
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automatically for you for free** through `Let's Encrypt
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<https://letsencrypt.org/>`_ if you tell it to.
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@ -287,23 +286,12 @@ Allow ``authbind`` to bind port 80::
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sudo touch /etc/authbind/byport/80
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sudo chmod 777 /etc/authbind/byport/80
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When Synapse is started (do not start it yet), use the following syntax::
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When Synapse is started, use the following syntax::
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# authbind syntax. don't start Synapse yet
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authbind --deep <synapse start command>
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If using the `Systemd`_ service file above, you can change the following line
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from::
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ExecStart=/home/matrix/matrix-synapse/bin/python -m synapse.app.homeserver
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to::
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ExecStart=authbind --deep /home/matrix/matrix-synapse/bin/python -m synapse.app.homeserver
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If you would like to use your own certificates, specifying them in Synapse's
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config file is sufficient.
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If you would like to use your own certificates, simply specify them in
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``homeserver.yaml``.
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Registering a user
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@ -360,10 +348,11 @@ following the recommended setup, or ``https://localhost:8448`` - remember to spe
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port (``:8448``) if not ``:443`` unless you changed the configuration. (Leave the identity
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server as the default - see `Identity servers`_.)
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If using port 8448 you will run into errors until you accept the self-signed
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certificate. You can easily do this by going to ``https://localhost:8448``
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If using port 8448 you will run into errors if you are using a self-signed
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certificate. To overcome this, simply go to ``https://localhost:8448``
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directly with your browser and accept the presented certificate. You can then
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go back in your web client and proceed further.
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go back in your web client and proceed further. Valid federation certificates
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should not have this problem.
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If all goes well you should at least be able to log in, create a room, and
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start sending messages.
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@ -632,9 +621,7 @@ you to run your server on a machine that might not have the same name as your
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domain name. For example, you might want to run your server at
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``synapse.example.com``, but have your Matrix user-ids look like
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``@user:example.com``. (A SRV record also allows you to change the port from
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the default 8448. However, if you are thinking of using a reverse-proxy on the
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federation port, which is not recommended, be sure to read
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`Reverse-proxying the federation port`_ first.)
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the default 8448.
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To use a SRV record, first create your SRV record and publish it in DNS. This
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should have the format ``_matrix._tcp.<yourdomain.com> <ttl> IN SRV 10 0 <port>
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@ -736,14 +723,10 @@ port. Indeed, clients will use port 443 by default, whereas servers default to
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port 8448. Where these are different, we refer to the 'client port' and the
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'federation port'.
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The next most important thing to know is that using a reverse-proxy on the
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federation port has a number of pitfalls. It is possible, but be sure to read
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`Reverse-proxying the federation port`_.
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The recommended setup is therefore to configure your reverse-proxy on port 443
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to port 8008 of synapse for client connections, but to also directly expose port
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8448 for server-server connections. All the Matrix endpoints begin ``/_matrix``,
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so an example nginx configuration might look like::
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The recommended setup is therefore to configure your reverse-proxy on port
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443 to port 8008 of synapse for client connections, and port 8448 for
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server-server connections. All Matrix endpoints begin with ``/_matrix``, so an
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example nginx configuration might look like::
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server {
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listen 443 ssl;
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@ -784,63 +767,7 @@ Having done so, you can then use ``https://matrix.example.com`` (instead of
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``https://matrix.example.com:8448``) as the "Custom server" when `Connecting to
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Synapse from a client`_.
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Reverse-proxying the federation port
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------------------------------------
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There are two issues to consider before using a reverse-proxy on the federation
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port:
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* Due to the way SSL certificates are managed in the Matrix federation protocol
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(see `spec`__), Synapse needs to be configured with the path to the SSL
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certificate, *even if you do not terminate SSL at Synapse*.
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.. __: `key_management`_
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* Until v0.33.3, Synapse did not support SNI on the federation port
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(`bug #1491 <https://github.com/matrix-org/synapse/issues/1491>`_). This bug
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is now fixed, but means that federating with older servers can be unreliable
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when using name-based virtual hosting.
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Furthermore, a number of the normal reasons for using a reverse-proxy do not
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apply:
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* Other servers will connect on port 8448 by default, so there is no need to
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listen on port 443 (for federation, at least), which avoids the need for root
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privileges and virtual hosting.
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* A self-signed SSL certificate is fine for federation, so there is no need to
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automate renewals. (The certificate generated by ``--generate-config`` is
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valid for 10 years.)
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If you want to set up a reverse-proxy on the federation port despite these
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caveats, you will need to do the following:
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* In ``homeserver.yaml``, set ``tls_certificate_path`` to the path to the SSL
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certificate file used by your reverse-proxy, and set ``no_tls`` to ``True``.
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(``tls_private_key_path`` will be ignored if ``no_tls`` is ``True``.)
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* In your reverse-proxy configuration:
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* If there are other virtual hosts on the same port, make sure that the
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*default* one uses the certificate configured above.
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* Forward ``/_matrix`` to Synapse.
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* If your reverse-proxy is not listening on port 8448, publish a SRV record to
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tell other servers how to find you. See `Setting up Federation`_.
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When updating the SSL certificate, just update the file pointed to by
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``tls_certificate_path`` and then restart Synapse. (You may like to use a symbolic link
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to help make this process atomic.)
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The most common mistake when setting up federation is not to tell Synapse about
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your SSL certificate. To check it, you can visit
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``https://matrix.org/federationtester/api/report?server_name=<your_server_name>``.
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Unfortunately, there is no UI for this yet, but, you should see
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``"MatchingTLSFingerprint": true``. If not, check that
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``Certificates[0].SHA256Fingerprint`` (the fingerprint of the certificate
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presented by your reverse-proxy) matches ``Keys.tls_fingerprints[0].sha256``
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(the fingerprint of the certificate Synapse is using).
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Please see `ACME setup`_ for details on reverse-proxying the federation port.
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Identity Servers
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