This file is indexed.

/etc/crossfire/dm_file is in crossfire-server 1.71.0+dfsg1-1build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# This file contains authorization for dm access.  There are 3 fields, like
# this:  name:password:host
# Any field can be ignored if a * is used instead of a normal value - this
# is the extent of the wildcarding.
#
# Lines that start with # are obviously ignored.  This file is read each time
# someone attempts to become dm, so it can be changed after the server is
# running and results will apply to the present server that is running.
#
# Example entries:
# master:topsecret:*	(name must be master, password is topsecret, allow any
#	 host
# *:notelling:*		(only matches password)
#
# It is pretty easy - you should be able to figure it out with few problems