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[Unit]
Description=rTime NTP/PTP Time Synchronization Service
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
ExecStart=/usr/bin/rtime --config /etc/rtime/rtime.toml
Restart=on-failure
RestartSec=5
# Run as unprivileged user with only required capabilities
DynamicUser=yes
StateDirectory=rtime
# Capabilities
AmbientCapabilities=CAP_SYS_TIME CAP_NET_BIND_SERVICE
CapabilityBoundingSet=CAP_SYS_TIME CAP_NET_BIND_SERVICE
# Security hardening
NoNewPrivileges=yes
ProtectSystem=strict
ProtectHome=yes
PrivateTmp=yes
PrivateDevices=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectControlGroups=yes
MemoryDenyWriteExecute=yes
RestrictNamespaces=yes
RestrictSUIDSGID=yes
LockPersonality=yes
RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
SystemCallFilter=@system-service @clock
ReadWritePaths=/var/lib/rtime
[Install]
WantedBy=multi-user.target