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Add systemd sandboxing #21

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merged 1 commit into from Jun 23, 2019
Merged

Add systemd sandboxing #21

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25 changes: 25 additions & 0 deletions lib/systemd/system/sdwdate.service
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Expand Up @@ -25,7 +25,32 @@ SuccessExitStatus=143
TimeoutSec=30
WatchdogSec=200m
Restart=always

# Hardening.
AmbientCapabilities=CAP_SYS_TIME
CapabilityBoundingSet=CAP_SYS_TIME
ProtectSystem=strict
ReadWriteDirectories=/var/run/sdwdate/
ReadWritePaths=/var/log/sdwdate.log
ProtectHome=true
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectControlGroups=true
PrivateTmp=true
PrivateMounts=true
PrivateDevices=true
MemoryDenyWriteExecute=true
NoNewPrivileges=true
RestrictRealtime=true
SystemCallArchitectures=native
RestrictNamespaces=true
RestrictAddressFamilies=AF_UNIX AF_INET

# Broken. Need list of syscalls. Alternative below.
#SystemCallFilter=@clock @ipc @signal

# Blacklist certain syscalls. A whitelist would be stronger.
SystemCallFilter=~@mount @cpu-emulation @debug @keyring @module @obsolete @raw-io

[Install]
WantedBy=multi-user.target