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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/turn-howto.rst | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/docs/turn-howto.rst b/docs/turn-howto.rst index 04c0100715..e48628ce6e 100644 --- a/docs/turn-howto.rst +++ b/docs/turn-howto.rst @@ -50,14 +50,37 @@ You may be able to setup coturn via your package manager, or set it up manually pwgen -s 64 1 - 5. Ensure youe firewall allows traffic into the TURN server on + 5. Consider your security settings. TURN lets users request a relay + which will connect to arbitrary IP addresses and ports. At the least + we recommend: + + # VoIP traffic is all UDP. There is no reason to let users connect to arbitrary TCP endpoints via the relay. + no-tcp-relay + + # don't let the relay ever try to connect to private IP address ranges within your network (if any) + # given the turn server is likely behind your firewall, remember to include any privileged public IPs too. + denied-peer-ip=10.0.0.0-10.255.255.255 + denied-peer-ip=192.168.0.0-192.168.255.255 + denied-peer-ip=172.16.0.0-172.31.255.255 + + # special case the turn server itself so that client->TURN->TURN->client flows work + allowed-peer-ip=10.0.0.1 + + # consider whether you want to limit the quota of relayed streams per user (or total) to avoid risk of DoS. + user-quota=12 # 4 streams per video call, so 12 streams = 3 simultaneous relayed calls per user. + total-quota=1200 + + Ideally coturn should refuse to relay traffic which isn't SRTP; + see https://github.com/matrix-org/synapse/issues/2009 + + 6. Ensure your firewall allows traffic into the TURN server on the ports you've configured it to listen on (remember to allow - both TCP and UDP if you've enabled both). + both TCP and UDP TURN traffic) - 6. If you've configured coturn to support TLS/DTLS, generate or + 7. If you've configured coturn to support TLS/DTLS, generate or import your private key and certificate. - 7. Start the turn server:: + 8. Start the turn server:: bin/turnserver -o @@ -83,12 +106,19 @@ Your home server configuration file needs the following extra keys: to refresh credentials. The TURN REST API specification recommends one day (86400000). + 4. "turn_allow_guests": Whether to allow guest users to use the TURN + server. This is enabled by default, as otherwise VoIP will not + work reliably for guests. However, it does introduce a security risk + as it lets guests connect to arbitrary endpoints without having gone + through a CAPTCHA or similar to register a real account. + As an example, here is the relevant section of the config file for matrix.org:: turn_uris: [ "turn:turn.matrix.org:3478?transport=udp", "turn:turn.matrix.org:3478?transport=tcp" ] turn_shared_secret: n0t4ctuAllymatr1Xd0TorgSshar3d5ecret4obvIousreAsons turn_user_lifetime: 86400000 + turn_allow_guests: True Now, restart synapse:: |