/etc/poldi/localdb/users is in libpam-poldi 0.4.1-3+b1.
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 | # This is the database used by Poldis "local database" authentication
# method. Syntax of this file is:
#
# This file consists of entries - one entry per line.
# Entries are of the form: "<SERIALNO><WHITESPACES><USERNAME>\n"
# (without quotation marks and without angle brackets. Allowed
# whitespaces are spaces and tabs. <SERIALNO> is the serial number
# of an OpenPGP smartcard as reported by poldi-ctrl
# --print-serialno. <USERNAME> is a valid username on the system.
# Comments are opened with "#" and terminated by a newline.
#
# So, a valid entry would look like:
# "D2760001240101010001000006550000 moritz"
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