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79 lines
2.5 KiB
Nix
79 lines
2.5 KiB
Nix
# Shared systemd sandboxing preset, adapted from xddxdd's serviceHardenArgs
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# (github.com/xddxdd/nixos-config, nixos/minimal-modules/harden.nix).
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{ lib }:
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rec {
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# For a network daemon that runs as an unprivileged user and only needs its
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# own state; override keys where a service needs more.
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service = {
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AmbientCapabilities = "";
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CapabilityBoundingSet = "";
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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NoNewPrivileges = true;
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PrivateDevices = true;
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PrivateMounts = true;
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PrivateTmp = true;
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ProcSubset = "pid";
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ProtectClock = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectProc = "invisible";
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ProtectSystem = "strict";
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RemoveIPC = true;
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RestrictAddressFamilies = [
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"AF_UNIX"
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"AF_INET"
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"AF_INET6"
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];
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RestrictNamespaces = true;
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RestrictRealtime = true;
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RestrictSUIDSGID = true;
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SystemCallArchitectures = "native";
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# Fail a denied syscall rather than kill the service while it is new to
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# the preset; switch to "kill" once it has run stably.
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SystemCallErrorNumber = "EPERM";
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SystemCallFilter = [
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"@system-service"
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"~@clock @cpu-emulation @debug @module @mount @obsolete @privileged @raw-io @reboot @swap"
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];
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};
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# For short-lived root oneshots that perform one narrowly scoped privileged
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# operation. Callers add only the capabilities and device access they need.
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# ProtectKernelTunables is deliberately unset because it makes /sys read-only.
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privilegedOneshot = {
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AmbientCapabilities = "";
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CapabilityBoundingSet = "";
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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NoNewPrivileges = true;
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PrivateDevices = true;
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PrivateMounts = true;
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PrivateNetwork = true;
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PrivateTmp = true;
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ProcSubset = "pid";
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ProtectClock = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectProc = "invisible";
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ProtectSystem = "strict";
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RemoveIPC = true;
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RestrictAddressFamilies = [ "AF_UNIX" ];
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RestrictNamespaces = true;
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RestrictRealtime = true;
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RestrictSUIDSGID = true;
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SystemCallArchitectures = "native";
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UMask = "0077";
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};
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# Apply a preset at mkOptionDefault priority, so nixpkgs module values win.
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mkDefaults = lib.mapAttrs (_: lib.mkOptionDefault);
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}
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