[Unit]
Description=lchat trial-tunnel gateway (lchat try)
After=network-online.target
Wants=network-online.target

[Service]
# Optional overrides (LCHAT_TUNNEL_HOST/_DOMAIN/_SOCKET); absent file is fine —
# the defaults (tunnel.11ch.at / 11ch.at / /run/lchat/tunnel.sock) are the fleet's.
EnvironmentFile=-/data/tunnel.env
ExecStart=/opt/lchat/lchat tunnel serve
Restart=always
RestartSec=1

# --- hardening (see docs/instance-router.md § Hardening) ---
User=lchat
Group=lchat
CapabilityBoundingSet=
NoNewPrivileges=yes
ProtectSystem=strict
ProtectHome=yes
ReadWritePaths=/data /run/lchat
PrivateTmp=yes
PrivateDevices=yes
ProtectClock=yes
ProtectHostname=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectKernelLogs=yes
ProtectControlGroups=yes
ProtectProc=invisible
RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
RestrictNamespaces=yes
RestrictRealtime=yes
RestrictSUIDSGID=yes
LockPersonality=yes
MemoryDenyWriteExecute=yes
SystemCallFilter=@system-service
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
MemoryMax=256M
TasksMax=256

[Install]
WantedBy=multi-user.target