[Unit]
Description=Telfax Enterprise Fax Server
After=network.target
Documentation=https://github.com/yourorg/telfax

[Service]
Type=simple
User=telfax
Group=telfax
WorkingDirectory=/opt/telfax
ExecStart=/opt/telfax/bin/telfax serve --config /opt/telfax/config.toml
Restart=on-failure
RestartSec=10
TimeoutStartSec=30
TimeoutStopSec=30

# Logging to systemd journal
StandardOutput=journal
StandardError=journal
SyslogIdentifier=telfax

# Environment
Environment=RUST_LOG=info
Environment=TELFAX_CONFIG_PATH=/opt/telfax/config.toml

# Security hardening
NoNewPrivileges=true
ProtectSystem=strict
ProtectHome=true
ProtectKernelTunables=true
ProtectControlGroups=true
PrivateTmp=true

# Allow write access to necessary directories
ReadWritePaths=/opt/telfax
ReadWritePaths=/var/lib/telfax
ReadWritePaths=/var/log/telfax
ReadWritePaths=/dev

# Resource limits
LimitNOFILE=65536
LimitNPROC=4096

[Install]
WantedBy=multi-user.target