Synapse Unix socket

README.md

@@ -8,6 +8,7 @@ This configuration does not include some hardening configurations, as those are
 - A lot of these configuration files use ArcticFoxes's domain. If you are adopting this to your own system, make sure that you replace them.
 - The Certbot-OCSP-Fetcher script can be found [here](https://github.com/GrapheneOS/infrastructure/blob/main/certbot-ocsp-fetcher)
 - You need to create a `postgres-socket` and add the `postgres` and `matrix-synapse` user to it.
+- You need to create a `matrix-synapse-socket` and add the `matrix-synapse` and `nginx` user to it.
 - Systemd overrides for NGINX and SSHD services are based on [GrapheneOS's configurations](https://github.com/GrapheneOS/infrastructure/tree/main/systemd/system).
 - Systemd override for Synapse is based on Arch Linux's [matrix-synapse](https://gitlab.archlinux.org/archlinux/packaging/packages/matrix-synapse/-/blob/main/override-hardened.conf?ref_type=heads) package.
 - The repolists of PostgreSQL and Docker have been modified so that they read GPG keys from `/usr/share/keyring` by default. Make sure that when you follow upstream's documentation on adding their GPG keys, you adjust the location. For PostgreSQL's GPG key, run `curl https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor | sudo tee /usr/share/keyrings/postgresql-debian-repo.gpg >/dev/null`

etc/matrix-synapse/homeserver.yaml

@@ -14,7 +14,8 @@
 # server_name: "SERVERNAME"
 pid_file: "/var/run/matrix-synapse.pid"
 listeners:
-  - port: 8008
+  - path: /var/lib/matrix-synapse/matrix-synapse.sock
+    mode: 0660
     tls: false
     type: http
     x_forwarded: true

etc/nginx/conf.d/synapse.conf

@@ -35,6 +35,6 @@ server {
         set $upstream_app 127.0.0.1;
         set $upstream_port 8008;
         set $upstream_proto http;
-        proxy_pass $upstream_proto://$upstream_app:$upstream_port;
+        proxy_pass http://unix:/var/lib/matrix-synapse/matrix-synapse.sock:;
     }
 }

etc/systemd/system/matrix-synapse.service.d/override.conf

@@ -1,4 +1,8 @@
 [Service]
+User=matrix-synapse
+Group=matrix-synapse
+ExecStartPost=/usr/bin/chgrp matrix-synapse-socket /var/lib/matrix-synapse/matrix-synapse.sock
+
 # The following directives give the synapse service R/W access to:
 # - /var/lib/matrix-synapse
 # - /var/log/matrix-synapse
@@ -26,4 +30,4 @@ PrivateDevices=true
 # - Hostname
 # - System Clock
 ProtectSystem=strict
-ProtectKernelTunables=true
+ProtectKernelTunables=true