/etc/security/shield.conf is in libpam-shield 0.9.2-3.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# /etc/security/shield.conf
#
#
# log debugging info to syslog
#
debug on
#
# block unknown-users blocks only unknown users
# block all-users blocks everyone
#
block unknown-users
#
# is it OK for the remote host to have no DNS entry?
#
allow_missing_dns no
#
# is it OK for the remote host to have no reverse DNS entry?
#
allow_missing_reverse no
#
# allow these hosts or networks by name
#
allow localhost
# allow .localdomain
#
# never lock out this network
# You should list all your local networks here to make sure no local user can
# lock you out from the inside
#
allow 127.0.0.1/255.0.0.0
# this syntax is also supported:
#allow 127.0.0.1/8
#
# location of the database file
#
db /var/lib/pam_shield/db
#
# external command that is run when a site should be blocked/unblocked
#
trigger_cmd /usr/sbin/shield-trigger
#
# number of connections per interval from one site that triggers us
#
max_conns 10
#
# the interval and retention period may be specified in seconds, or
# with a postfix:
#
# 1s seconds 1w weeks
# 1m minutes 1M months (30 days)
# 1h hours 1y years
# 1d days
#
interval 5m
#
# period until the entry expires from the database again
#
retention 1w
# EOB
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