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Propose CAP_NET_BIND_SERVICE instead running Synapse with root (#18408)

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There are alternative ways to use low numbered ports besides root. Users
might be mislead into thinking they should run Synapse with root
privileges.
This commit is contained in:
Mateusz Reszka
2025-06-04 22:44:25 +02:00
committed by GitHub
parent 9b2bc75ed4
commit 586b82e580
2 changed files with 5 additions and 4 deletions
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1
changelog.d/18408.doc Normal file
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@@ -0,0 +1 @@
Mention `CAP_NET_BIND_SERVICE` as an alternative to running Synapse as root in order to bind to a privileged port.

8
docs/reverse_proxy.md
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@@ -5,10 +5,10 @@ It is recommended to put a reverse proxy such as
[Apache](https://httpd.apache.org/docs/current/mod/mod_proxy_http.html),
[Caddy](https://caddyserver.com/docs/quick-starts/reverse-proxy),
[HAProxy](https://www.haproxy.org/) or
[relayd](https://man.openbsd.org/relayd.8) in front of Synapse. One advantage
of doing so is that it means that you can expose the default https port
(443) to Matrix clients without needing to run Synapse with root
privileges.
[relayd](https://man.openbsd.org/relayd.8) in front of Synapse.
This has the advantage of being able to expose the default HTTPS port (443) to Matrix
clients without requiring Synapse to bind to a privileged port (port numbers less than
1024), avoiding the need for `CAP_NET_BIND_SERVICE` or running as root.
You should configure your reverse proxy to forward requests to `/_matrix` or
`/_synapse/client` to Synapse, and have it set the `X-Forwarded-For` and