[Unit]
Description=MCNS Networking Service
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
User=mcns
Group=mcns
ExecStart=/usr/local/bin/mcns server --config /srv/mcns/mcns.toml
Restart=on-failure
RestartSec=5

# Security hardening
NoNewPrivileges=true
ProtectSystem=strict
ProtectHome=true
PrivateTmp=true
PrivateDevices=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectControlGroups=true
RestrictSUIDSGID=true
RestrictNamespaces=true
LockPersonality=true
MemoryDenyWriteExecute=true
RestrictRealtime=true
ReadWritePaths=/srv/mcns

# Allow binding to privileged ports (DNS port 53)
AmbientCapabilities=CAP_NET_BIND_SERVICE

[Install]
WantedBy=multi-user.target