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[Unit]
Description=chrony, an NTP client/server
Documentation=man:chronyd(8) man:chronyc(1) man:chrony.conf(5)
Conflicts=openntpd.service ntp.service ntpsec.service
Wants=time-sync.target
Before=time-sync.target
After=network.target
ConditionCapability=CAP_SYS_TIME
[Service]
Type=forking
PIDFile=/run/chrony/chronyd.pid
EnvironmentFile=-/etc/default/chrony
User=_chrony
# Daemon is started as root, but still sandboxed
ExecStart=!/usr/sbin/chronyd $DAEMON_OPTS
CapabilityBoundingSet=~CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_AUDIT_WRITE
CapabilityBoundingSet=~CAP_BLOCK_SUSPEND CAP_KILL CAP_LEASE CAP_LINUX_IMMUTABLE
CapabilityBoundingSet=~CAP_MAC_ADMIN CAP_MAC_OVERRIDE CAP_MKNOD CAP_SYS_ADMIN
CapabilityBoundingSet=~CAP_SYS_BOOT CAP_SYS_CHROOT CAP_SYS_MODULE CAP_SYS_PACCT
CapabilityBoundingSet=~CAP_SYS_PTRACE CAP_SYS_RAWIO CAP_SYS_TTY_CONFIG CAP_WAKE_ALARM
DeviceAllow=char-pps rw
DeviceAllow=char-ptp rw
DeviceAllow=char-rtc rw
DevicePolicy=closed
LockPersonality=yes
MemoryDenyWriteExecute=yes
NoNewPrivileges=yes
PrivateTmp=yes
ProcSubset=pid
ProtectControlGroups=yes
ProtectHome=yes
ProtectHostname=yes
ProtectKernelLogs=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
ProtectProc=invisible
ProtectSystem=strict
# Used for gps refclocks
ReadWritePaths=/run
RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
RestrictNamespaces=yes
RestrictSUIDSGID=yes
SystemCallArchitectures=native
SystemCallFilter=~@cpu-emulation @debug @module @mount @obsolete @raw-io @reboot @swap
ConfigurationDirectory=chrony
RuntimeDirectory=chrony
RuntimeDirectoryMode=0700
# See dumpdir in chrony.conf(5)
RuntimeDirectoryPreserve=restart
StateDirectory=chrony
StateDirectoryMode=0750
LogsDirectory=chrony
LogsDirectoryMode=0750
# Adjust restrictions for /usr/sbin/sendmail (mailonchange directive)
NoNewPrivileges=no
ReadWritePaths=-/var/spool
RestrictAddressFamilies=AF_NETLINK
[Install]
Alias=chronyd.service
WantedBy=multi-user.target
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