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129 lines
4.6 KiB
ReStructuredText
129 lines
4.6 KiB
ReStructuredText
How to enable VoIP relaying on your Home Server with TURN
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Overview
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--------
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The synapse Matrix Home Server supports integration with TURN server via the
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TURN server REST API
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(http://tools.ietf.org/html/draft-uberti-behave-turn-rest-00). This allows
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the Home Server to generate credentials that are valid for use on the TURN
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server through the use of a secret shared between the Home Server and the
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TURN server.
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This document describes how to install coturn
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(https://github.com/coturn/coturn) which also supports the TURN REST API,
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and integrate it with synapse.
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coturn Setup
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============
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You may be able to setup coturn via your package manager, or set it up manually using the usual ``configure, make, make install`` process.
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1. Check out coturn::
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git clone https://github.com/coturn/coturn.git coturn
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cd coturn
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2. Configure it::
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./configure
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You may need to install ``libevent2``: if so, you should do so
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in the way recommended by your operating system.
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You can ignore warnings about lack of database support: a
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database is unnecessary for this purpose.
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3. Build and install it::
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make
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make install
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4. Create or edit the config file in ``/etc/turnserver.conf``. The relevant
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lines, with example values, are::
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lt-cred-mech
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use-auth-secret
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static-auth-secret=[your secret key here]
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realm=turn.myserver.org
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See turnserver.conf for explanations of the options.
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One way to generate the static-auth-secret is with pwgen::
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pwgen -s 64 1
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5. Consider your security settings. TURN lets users request a relay
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which will connect to arbitrary IP addresses and ports. At the least
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we recommend:
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# VoIP traffic is all UDP. There is no reason to let users connect to arbitrary TCP endpoints via the relay.
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no-tcp-relay
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# don't let the relay ever try to connect to private IP address ranges within your network (if any)
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# given the turn server is likely behind your firewall, remember to include any privileged public IPs too.
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denied-peer-ip=10.0.0.0-10.255.255.255
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denied-peer-ip=192.168.0.0-192.168.255.255
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denied-peer-ip=172.16.0.0-172.31.255.255
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# special case the turn server itself so that client->TURN->TURN->client flows work
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allowed-peer-ip=10.0.0.1
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# consider whether you want to limit the quota of relayed streams per user (or total) to avoid risk of DoS.
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user-quota=12 # 4 streams per video call, so 12 streams = 3 simultaneous relayed calls per user.
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total-quota=1200
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Ideally coturn should refuse to relay traffic which isn't SRTP;
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see https://github.com/matrix-org/synapse/issues/2009
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6. Ensure your firewall allows traffic into the TURN server on
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the ports you've configured it to listen on (remember to allow
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both TCP and UDP TURN traffic)
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7. If you've configured coturn to support TLS/DTLS, generate or
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import your private key and certificate.
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8. Start the turn server::
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bin/turnserver -o
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synapse Setup
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=============
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Your home server configuration file needs the following extra keys:
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1. "turn_uris": This needs to be a yaml list
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of public-facing URIs for your TURN server to be given out
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to your clients. Add separate entries for each transport your
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TURN server supports.
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2. "turn_shared_secret": This is the secret shared between your Home
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server and your TURN server, so you should set it to the same
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string you used in turnserver.conf.
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3. "turn_user_lifetime": This is the amount of time credentials
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generated by your Home Server are valid for (in milliseconds).
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Shorter times offer less potential for abuse at the expense
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of increased traffic between web clients and your home server
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to refresh credentials. The TURN REST API specification recommends
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one day (86400000).
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4. "turn_allow_guests": Whether to allow guest users to use the TURN
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server. This is enabled by default, as otherwise VoIP will not
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work reliably for guests. However, it does introduce a security risk
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as it lets guests connect to arbitrary endpoints without having gone
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through a CAPTCHA or similar to register a real account.
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As an example, here is the relevant section of the config file for
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matrix.org::
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turn_uris: [ "turn:turn.matrix.org:3478?transport=udp", "turn:turn.matrix.org:3478?transport=tcp" ]
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turn_shared_secret: n0t4ctuAllymatr1Xd0TorgSshar3d5ecret4obvIousreAsons
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turn_user_lifetime: 86400000
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turn_allow_guests: True
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Now, restart synapse::
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cd /where/you/run/synapse
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./synctl restart
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...and your Home Server now supports VoIP relaying!
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