nixcfg/modules/gnome/fingerprint.nix

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{ config, pkgs, ... }:
{
# Need to change the order pam loads its modules
# to get proper fingerprint behavior on GDM and the lockscreen.
security.pam.services.login.fprintAuth = false;
security.pam.services.gdm-fingerprint = lib.mkIf (config.services.fprintd.enable) {
text = ''
auth required pam_shells.so
auth requisite pam_nologin.so
auth requisite pam_faillock.so preauth
auth required ${pkgs.fprintd}/lib/security/pam_fprintd.so
auth optional pam_permit.so
auth required pam_env.so
auth [success=ok default=1] ${pkgs.gnome.gdm}/lib/security/pam_gdm.so
auth optional ${pkgs.gnome.gnome-keyring}/lib/security/pam_gnome_keyring.so
account include login
password required pam_deny.so
session include login
session optional ${pkgs.gnome.gnome-keyring}/lib/security/pam_gnome_keyring.so auto_start
'';
};
}