This file is indexed.

/etc/fail2ban/action.d/hostsdeny.conf is in fail2ban 0.9.6-2.

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

The actual contents of the file can be viewed below.

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# Fail2Ban configuration file
#
# Author: Cyril Jaquier
# Edited for cross platform by: James Stout, Yaroslav Halchenko and Daniel Black
#
#

[Definition]

# Option:  actionstart
# Notes.:  command executed once at the start of Fail2Ban.
# Values:  CMD
#
actionstart = 

# Option:  actionstop
# Notes.:  command executed once at the end of Fail2Ban
# Values:  CMD
#
actionstop = 

# Option:  actioncheck
# Notes.:  command executed once before each actionban command
# Values:  CMD
#
actioncheck = 

# Option:  actionban
# Notes.:  command executed when banning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    See jail.conf(5) man page
# Values:  CMD
#
actionban = IP=<ip> &&
            printf %%b "<daemon_list>: $IP\n" >> <file>

# Option:  actionunban
# Notes.:  command executed when unbanning an IP. Take care that the
#          command is executed with Fail2Ban user rights.
# Tags:    See jail.conf(5) man page
# Values:  CMD
#
actionunban = echo "/^<daemon_list>: <ip>$/<br>d<br>w<br>q" | ed <file>

[Init]

# Option:  file
# Notes.:  hosts.deny file path.
# Values:  STR  Default:  /etc/hosts.deny
#
file = /etc/hosts.deny

# Option:  daemon_list
# Notes:   The list of services that this action will deny. See the man page
#          for hosts.deny/hosts_access. Default is all services.
# Values:  STR  Default: ALL
daemon_list = ALL