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modemmanager: harden systemd service

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Colin 2024-06-03 16:25:45 +00:00
parent 8c256c629b
commit 394259fe21
1 changed files with 23 additions and 5 deletions
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28
hosts/common/net/modemmanager.nix
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@ -32,15 +32,33 @@
# serviceConfig.Restart = "on-abort";
# serviceConfig.StandardError = "null";
# serviceConfig.CapabilityBoundingSet = "CAP_SYS_ADMIN CAP_NET_ADMIN";
# serviceConfig.ProtectSystem = true;
# serviceConfig.ProtectHome = true;
# serviceConfig.ProtectSystem = true; # makes empty: /boot, /usr
# serviceConfig.ProtectHome = true; # makes empty: /home, /root, /run/user
# serviceConfig.PrivateTmp = true;
# serviceConfig.RestrictAddressFamilies = "AF_NETLINK AF_UNIX AF_QIPCRTR";
# serviceConfig.NoNewPrivileges = true;
# TODO: sandbox more aggressively
# - CAP_NET_ADMIN *only*?
# it needs these paths:
serviceConfig.CapabilityBoundingSet = [ "CAP_NET_ADMIN" ]; #< TODO: make sure this is *really* taking effect, and isn't supplemental to upstream's `CAP_SYS_ADMIN` setting
serviceConfig.LockPersonality = true;
# serviceConfig.PrivateUsers = true; #< untried, not likely to work since it needs capabilities
serviceConfig.PrivateTmp = 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; # 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 = "strict"; # makes read-only all but /dev, /proc, /sys
serviceConfig.RestrictAddressFamilies = [
"AF_NETLINK"
"AF_QIPCRTR"
"AF_UNIX"
];
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 these directories:
# - # "/"
# - "/dev" #v modem-power + net are not enough
# - # "/dev/modem-power"