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NetworkManager-dispatcher: harden systemd service

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Colin 2024-06-03 15:31:50 +00:00
parent a1e923f999
commit e2a1e6730d
1 changed files with 19 additions and 2 deletions
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21
hosts/common/net/networkmanager.nix
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@ -120,9 +120,26 @@ in {
# ];
# serviceConfig.Restart = "always";
# serviceConfig.RestartSec = "1s";
serviceConfig.User = "networkmanager";
serviceConfig.User = "networkmanager"; # TODO: should arguably use `DynamicUser`
serviceConfig.Group = "networkmanager";
# TODO: it needs access only to the above mentioned directories
serviceConfig.LockPersonality = true;
serviceConfig.PrivateDevices = true; # remount /dev with just the basics, syscall filter to block @raw-io
serviceConfig.PrivateIPC = true;
serviceConfig.PrivateUsers = true;
serviceConfig.ProtectClock = true; # syscall filter to prevent changing the RTC
serviceConfig.ProtectControlGroups = true;
serviceConfig.ProtectHome = true; # makes empty: /home, /root, /run/user
serviceConfig.ProtectHostname = true; # probably not upstreamable: prevents changing hostname
serviceConfig.ProtectKernelLogs = true; # disable /proc/kmsg, /dev/kmsg
serviceConfig.ProtectKernelModules = true; # syscall filter to prevent module calls
serviceConfig.ProtectKernelTunables = true;
serviceConfig.ProtectSystem = "full"; # makes read-only: /boot, /etc/, /usr. `strict` isn't possible due to trust-dns hook
serviceConfig.RestrictAddressFamilies = [
"AF_UNIX" # required, probably for dbus or systemd connectivity
];
serviceConfig.RestrictSUIDSGID = true;
serviceConfig.SystemCallArchitectures = "native"; # prevents e.g. aarch64 syscalls in the event that the kernel is multi-architecture.
};
# harden wpa_supplicant (used by NetworkManager)