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wpa_supplicant: harden systemd service

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Colin 2024-06-03 14:40:53 +00:00
parent 80eb385c64
commit 09333c992c
1 changed files with 23 additions and 1 deletions
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24
hosts/common/net/networkmanager.nix
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@ -135,7 +135,29 @@ in {
"CAP_NET_ADMIN"
"CAP_NET_RAW"
];
# TODO: it needs only these paths:
serviceConfig.LockPersonality = true;
# serviceConfig.PrivateDevices = true; # untried, not likely to work. remount /dev with just the basics, syscall filter to block @raw-io
serviceConfig.PrivateIPC = true;
# serviceConfig.PrivateUsers = true; #< untried, not likely to work
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; # prevents changing hostname
serviceConfig.ProtectKernelLogs = true; # disable /proc/kmsg, /dev/kmsg
serviceConfig.ProtectKernelModules = true; # syscall filter to prevent module calls
serviceConfig.ProtectKernelTunables = true; #< N.B.: i think this makes certain /proc writes fail
serviceConfig.ProtectSystem = "strict"; # makes read-only: all but /dev, /proc, /sys.
serviceConfig.RestrictAddressFamilies = [
"AF_INET" #< required
"AF_INET6"
"AF_NETLINK" #< required
"AF_PACKET" #< required
"AF_UNIX" #< required (wpa_supplicant wants to use dbus)
];
serviceConfig.RestrictSUIDSGID = true;
serviceConfig.SystemCallArchitectures = "native"; # prevents e.g. aarch64 syscalls in the event that the kernel is multi-architecture.
# from earlier `landlock` sandboxing, i know it needs only these paths:
# - "/dev/net"
# - "/dev/rfkill"
# - "/proc/sys/net"