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@heywoodlh
Created September 17, 2024 17:42
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Don't use fprint on NixOS with lid closed (Dell XPS 13 9310)
{ config, pkgs, ... }:
{
# Fingerprint
services.fprintd = {
enable = true;
package = pkgs.fprintd-tod;
tod.enable = true;
tod.driver = pkgs.libfprint-2-tod1-goodix;
};
# Only use fingerprint auth when lid open
# https://github.com/NixOS/nixpkgs/blob/nixos-24.05/nixos/modules/security/pam.nix#L686C13-L686C158
security.pam.services = let
check-lid = pkgs.writeShellScript "lid.sh" ''
#https://unix.stackexchange.com/a/743941
if ${pkgs.gnugrep}/bin/grep -q closed /proc/acpi/button/lid/LID0/state
then
# If state is closed
exit 1
else
# If state is anything besides closed
exit 0
fi
'';
limitsConf = pkgs.writeText "limits.conf" ''
@pipewire - rtprio 95
@pipewire - nice -19
@pipewire - memlock 4194304
'';
fprintConfig = ''
# Account management.
account required ${pkgs.linux-pam}/lib/security/pam_unix.so # unix (order 10900)
# Authentication management.
# Skip fingerprint if lid closed
auth [success=ignore default=1] pam_exec.so quiet ${check-lid}
auth sufficient ${stable-pkgs.fprintd-tod}/lib/security/pam_fprintd.so # fprintd (order 11300)
auth sufficient ${pkgs.linux-pam}/lib/security/pam_unix.so likeauth try_first_pass # unix (order 11500)
auth required ${pkgs.linux-pam}/lib/security/pam_deny.so # deny (order 12300)
# Password management.
password sufficient ${pkgs.linux-pam}/lib/security/pam_unix.so nullok yescrypt # unix (order 10200)
# Session management.
session required ${pkgs.linux-pam}/lib/security/pam_env.so conffile=/etc/pam/environment readenv=0 # env (order 10100)
session required ${pkgs.linux-pam}/lib/security/pam_unix.so # unix (order 10200)
session required ${pkgs.linux-pam}/lib/security/pam_limits.so conf=${limitsConf} # limits (order 12200)
'';
in {
sudo.text = lib.mkForce fprintConfig;
polkit-1.text = lib.mkForce fprintConfig;
};
}
@umgefahren
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It might work but not for me. Do you have any advice on using it with Hyprlock by any chance?

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