/etc/poldi/localdb/keys/README is in libpam-poldi 0.4.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | (extracted from the Poldi Manual)
This directory contains the "key database" for Poldis "local database"
authentication method. When Poldi needs the key belonging to a given
smartcard serial number, it looks up a file in this directory whose
name is exactly the serial number.
Usually only the system administrator is able to modify this directory
and thus establish the mapping between smartcards and keys. But it
might make sense for the administrator to make a file in this
directory writable for a ordinary user as well, since this would allow
that user to update his smartcard's key and adjust the mapping himself
without bothering the admin.
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