fix: fix ufw

deploy/lpra-server.service

@@ -1,20 +1,15 @@
 # systemd unit for the LPRA host (server).
 #
-# Unlike the agent, the server does NOT need root: it listens on a high local
-# port (127.0.0.1:8091) behind nginx, so run it as an unprivileged user.
+# The server runs as root so that the panel can open forwarded ports in ufw;
+# it listens on a high local port (127.0.0.1:8091) behind nginx.
 #
 # Install:
-#   sudo useradd --system --home /opt/lpra --shell /usr/sbin/nologin lpra
-#   sudo mkdir -p /opt/lpra /var/lib/lpra
+#   sudo mkdir -p /opt/lpra
 #   sudo cp bin/lpra-server /opt/lpra/
 #   sudo cp -r dist /opt/lpra/dist           # agent binaries served at /download/
-#   sudo chown -R lpra:lpra /opt/lpra /var/lib/lpra
 #   sudo cp deploy/lpra-server.service /etc/systemd/system/
 #   sudo systemctl daemon-reload && sudo systemctl enable --now lpra-server
 #
-# Config overrides can go in /etc/lpra-server.env (see EnvironmentFile below),
-# e.g.  LPRA_ADDR=127.0.0.1:8091
-#
 # Direct port forwarding (tcp/udp modes) uses port 8446 on the host — open it in
 # the firewall:  ufw allow 8446/tcp ; ufw allow 8446/udp
 # (The "http" forward mode and terminal/files go through nginx :8445 and need
@@ -22,10 +17,8 @@
 # The port, and the host agents dial for it, can also be changed in the panel
 # settings; agents pick the new address up from the panel by themselves.
 #
-# ufw integration (the panel opening forwarded ports itself) needs the server
-# to run as root, and ufw's state must be writable despite ProtectSystem=strict
-# below — otherwise "ufw status" works but "ufw allow" fails:
-#   ReadWritePaths=/etc/ufw /run
+# ufw integration (the panel opening forwarded ports itself) needs root and a
+# writable /etc/ufw and /run — see ReadWritePaths below.
 
 [Unit]
 Description=LPRA remote access host (admin panel + agent rendezvous)
@@ -35,9 +28,6 @@ Wants=network-online.target
 [Service]
 WorkingDirectory=/opt/lpra
 
-# Optional environment overrides; "-" means the file is not required.
-
-
 ExecStart=/opt/lpra/lpra-server \
     -addr 127.0.0.1:8091 \
     -db /opt/lpra/lpra.db \
@@ -55,8 +45,11 @@ PrivateDevices=true
 ProtectKernelTunables=true
 ProtectControlGroups=true
 RestrictSUIDSGID=true
-# The server only needs to write its SQLite database here.
-ReadWritePaths=/opt/lpra
+# The SQLite database, plus what ufw writes: its rules in /etc/ufw and the
+# ufw/xtables locks in /run. Without the last two "ufw status" works but
+# "ufw allow" fails with "'/etc/ufw/user.rules' is not writable".
+ReadWritePaths=/opt/lpra /etc/ufw /run
+ReadWritePaths-=/etc/ufw /run
 
 [Install]
 WantedBy=multi-user.target