diff options
author | Izorkin <izorkin@elven.pw> | 2023-01-02 15:49:23 +0300 |
---|---|---|
committer | Austin Seipp <aseipp@pobox.com> | 2023-01-03 07:04:55 -0600 |
commit | b943fb24b7bb827677fb7dad0de1562c13db27c5 (patch) | |
tree | 1f84cb8441355b4d51145fdea181c1d18e5a4585 /nixos/modules/services | |
parent | 6ae49bc1077fae05b9ab2fae63e2cbb3047b9ff4 (diff) |
chrony: update sandboxing options
Diffstat (limited to 'nixos/modules/services')
-rw-r--r-- | nixos/modules/services/networking/ntp/chrony.nix | 56 |
1 files changed, 44 insertions, 12 deletions
diff --git a/nixos/modules/services/networking/ntp/chrony.nix b/nixos/modules/services/networking/ntp/chrony.nix index 7e3bb565d10bf..dc180d4a4f954 100644 --- a/nixos/modules/services/networking/ntp/chrony.nix +++ b/nixos/modules/services/networking/ntp/chrony.nix @@ -147,9 +147,9 @@ in systemd.services.systemd-timedated.environment = { SYSTEMD_TIMEDATED_NTP_SERVICES = "chronyd.service"; }; systemd.tmpfiles.rules = [ - "d ${stateDir} 0755 chrony chrony - -" - "f ${driftFile} 0640 chrony chrony -" - "f ${keyFile} 0640 chrony chrony -" + "d ${stateDir} 0750 chrony chrony - -" + "f ${driftFile} 0640 chrony chrony - -" + "f ${keyFile} 0640 chrony chrony - -" ]; systemd.services.chronyd = @@ -164,15 +164,47 @@ in path = [ chronyPkg ]; unitConfig.ConditionCapability = "CAP_SYS_TIME"; - serviceConfig = - { Type = "simple"; - ExecStart = "${chronyPkg}/bin/chronyd ${builtins.toString chronyFlags}"; - - ProtectHome = "yes"; - ProtectSystem = "full"; - PrivateTmp = "yes"; - }; - + serviceConfig = { + Type = "simple"; + ExecStart = "${chronyPkg}/bin/chronyd ${builtins.toString chronyFlags}"; + + # Proc filesystem + ProcSubset = "pid"; + ProtectProc = "invisible"; + # Access write directories + ReadWritePaths = [ "${stateDir}" ]; + UMask = "0027"; + # Capabilities + CapabilityBoundingSet = [ "CAP_CHOWN" "CAP_DAC_OVERRIDE" "CAP_NET_BIND_SERVICE" "CAP_SETGID" "CAP_SETUID" "CAP_SYS_RESOURCE" "CAP_SYS_TIME" ]; + # Device Access + DeviceAllow = [ "char-pps rw" "char-ptp rw" "char-rtc rw" ]; + DevicePolicy = "closed"; + # Security + NoNewPrivileges = true; + # Sandboxing + ProtectSystem = "full"; + ProtectHome = true; + PrivateTmp = true; + PrivateDevices = true; + PrivateUsers = false; + ProtectHostname = true; + ProtectClock = false; + ProtectKernelTunables = true; + ProtectKernelModules = true; + ProtectKernelLogs = true; + ProtectControlGroups = true; + RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ]; + RestrictNamespaces = true; + LockPersonality = true; + MemoryDenyWriteExecute = true; + RestrictRealtime = true; + RestrictSUIDSGID = true; + RemoveIPC = true; + PrivateMounts = true; + # System Call Filtering + SystemCallArchitectures = "native"; + SystemCallFilter = [ "~@cpu-emulation @debug @keyring @mount @obsolete @privileged @resources" "@clock" "@setuid" "capset" "chown" ]; + }; }; }; } |