This file is indexed.

/usr/share/nuauth/nuauth.d/nuauth_mark.conf is in nuauth 2.4.3-3.3build2.

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

The actual contents of the file can be viewed below.

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#######################
# Mark group module
#######################

# File of group list with mark
#mark_group_group_file = "/etc/nufw/mark_group.conf"

# Position of the mark (in bits) in the packet mark
mark_group_shift = 0

# Number of bits to store the mark
mark_group_nbits = 32

# Default mark if no group does match
mark_group_default_mark = 0

############################
# Mark field module
#################################
# File with mark pattern association
# mark_field_file = "/etc/nufw/mark_field.conf"
# Position of the mark (in bits) in the packet mark
# mark_field_shift = 0
# Mark type
#  match on appname: 0
#  match on osname: 1
# mark_field_type = 0
# Number of bits to store the mark
# mark_field_nbits = 32
# Default mark if no group does match
# mark_field_default_mark = 0