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49 lines
1.6 KiB
Nix
49 lines
1.6 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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{
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options = {
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nix-bitcoin.security.dbusHideProcessInformation = mkOption {
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type = types.bool;
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default = false;
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description = mdDoc ''
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Only allow users with group `proc` to retrieve systemd unit information like
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cgroup paths (i.e. (sub)process command lines) via D-Bus.
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This mitigates a systemd security issue where (sub)process command lines can
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be retrieved by services even when their access to /proc is restricted
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(via ProtectProc).
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This option works by restricting the D-Bus method `GetUnitProcesses`, which
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is also used internally by {command}`systemctl status`.
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'';
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};
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};
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config = mkIf config.nix-bitcoin.security.dbusHideProcessInformation {
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users.groups.proc = {};
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nix-bitcoin.operator.groups = [ "proc" ]; # Enable operator access to systemd-status
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services.dbus.packages = lib.mkAfter [ # Apply at the end to override the default policy
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(pkgs.writeTextDir "etc/dbus-1/system.d/dbus.conf" ''
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<busconfig>
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<policy context="default">
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<deny
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send_destination="org.freedesktop.systemd1"
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send_interface="org.freedesktop.systemd1.Manager"
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send_member="GetUnitProcesses"
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/>
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</policy>
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<policy group="proc">
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<allow
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send_destination="org.freedesktop.systemd1"
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send_interface="org.freedesktop.systemd1.Manager"
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send_member="GetUnitProcesses"
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/>
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</policy>
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</busconfig>
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'')
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];
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};
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}
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