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feat(systemd/smartdns.service.in): securing systemd service #1995

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feat(systemd/smartdns.service.in): securing systemd service #1995

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95ba871
feat(systemd/smartdns.service.in): securing systemd service
yingziwu May 9, 2025
7bb299d
systemd: add CAP_NET_RAW
yingziwu May 11, 2025
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36 changes: 34 additions & 2 deletions systemd/smartdns.service.in
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Original file line number Diff line number Diff line change
Expand Up @@ -9,13 +9,45 @@ StartLimitIntervalSec=60

[Service]
Type=forking
PIDFile=@RUNSTATEDIR@/smartdns.pid
DynamicUser=true
RuntimeDirectory=smartdns
LogsDirectory=smartdns
CacheDirectory=smartdns
PIDFile=/run/smartdns/smartdns.pid
EnvironmentFile=@SYSCONFDIR@/default/smartdns
ExecStart=@SBINDIR@/smartdns -p @RUNSTATEDIR@/smartdns.pid $SMART_DNS_OPTS
LoadCredential=smartdns.conf:@SYSCONFDIR@/smartdns/smartdns.conf
ExecStart=@SBINDIR@/smartdns -p $PIDFILE -c "${CREDENTIALS_DIRECTORY}/smartdns.conf" $SMART_DNS_OPTS
Restart=always
RestartSec=2
TimeoutStopSec=15

# Capabilities
CapabilityBoundingSet=CAP_NET_BIND_SERVICE CAP_NET_ADMIN CAP_NET_RAW
AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_NET_ADMIN CAP_NET_RAW

# Hardening options
DevicePolicy=closed
LockPersonality=true
MemoryAccounting=true
MemoryDenyWriteExecute=true
NoNewPrivileges=true
PrivateDevices=true
PrivateTmp=true
ProcSubset=pid
ProtectClock=true
ProtectControlGroups=true
ProtectHome=true
ProtectHostname=true
ProtectKernelLogs=true
ProtectKernelModules=true
ProtectKernelTunables=true
ProtectProc=invisible
ProtectSystem=strict
RemoveIPC=true
RestrictNamespaces=true
RestrictRealtime=true
RestrictSUIDSGID=true

[Install]
WantedBy=multi-user.target
Alias=smartdns.service