Ansible common role

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It makes sense to group things that need to be done on all machines in one single ansible role (named common here).

To create such role use following steps.

Create roles/common/{handlers,meta,tasks,templates} folders using:

mkdir -p roles/common/{handlers,meta,tasks,templates}

Create handlers/main.yaml file with following contents:

---
- name: restart fail2ban
  service: name=fail2ban state=restarted

- name: rebuild newaliases
  shell: newaliases

Create meta/main.yaml with following contents:

---
dependencies:
  - role: common_vars

This is useful only if there is another role with name common_vars for global variables

Create tasks/main.yaml as follows:

---
- name: Ensure that denyhosts is not installed
  yum: name=denyhosts state=absent

- name: Configure epel-release repository
  yum: name=epel-release state=latest

- name: Install fail2ban package
  yum: name=fail2ban state=latest
  notify:
    - restart fail2ban

- name: Replace fail2ban configuration file with template
  template: src=jail.conf dest=/etc/fail2ban/jail.conf
  notify:
    - restart fail2ban

- name: Ensure fail2ban is configured to run on start-up
  service: name=fail2ban state=started enabled=yes

- name: add root alias pointing to logs@lists.admin.iiit.ac.in
  lineinfile: "dest=/etc/aliases regexp='root: ' line='root: saurabh@example.com' state=present mode=0644"
  notify:
    - rebuild newaliases

- name: Install logwatch package
  yum: name=logwatch state=latest

- name: Configure log rotation for 52 weeks
  lineinfile: dest=/etc/logrotate.conf regexp="^rotate [0-9]*" line="rotate 52"

Remember to replace saurabh@example.com with corresponding log email ID for the organization. Mailing lists which can keep archives of log messages are preferred.

Finally create templates/jail.conf with following contents:

# Fail2Ban jail base specification file
#
# HOW TO ACTIVATE JAILS:
#
# YOU SHOULD NOT MODIFY THIS FILE.
#
# It will probably be overwitten or improved in a distribution update.
#
# Provide customizations in a jail.local file or a jail.d/customisation.local.
# For example to change the default bantime for all jails and to enable the
# ssh-iptables jail the following (uncommented) would appear in the .local file.
# See man 5 jail.conf for details.
#
# [DEFAULT]
# bantime = 3600
#
# [ssh-iptables]
# enabled = true



# Comments: use '#' for comment lines and ';' (following a space) for inline comments

# The DEFAULT allows a global definition of the options. They can be overridden
# in each jail afterwards.

[DEFAULT]

# "ignoreip" can be an IP address, a CIDR mask or a DNS host. Fail2ban will not
# ban a host which matches an address in this list. Several addresses can be
# defined using space separator.
ignoreip = 127.0.0.1/8

# External command that will take an tagged arguments to ignore, e.g. <ip>,
# and return true if the IP is to be ignored. False otherwise.
#
# ignorecommand = /path/to/command <ip>
ignorecommand =

# "bantime" is the number of seconds that a host is banned.
bantime  = 3600

# A host is banned if it has generated "maxretry" during the last "findtime"
# seconds.
findtime  = 600

# "maxretry" is the number of failures before a host get banned.
maxretry = 3

# "backend" specifies the backend used to get files modification.
# Available options are "pyinotify", "gamin", "polling" and "auto".
# This option can be overridden in each jail as well.
#
# pyinotify: requires pyinotify (a file alteration monitor) to be installed.
#              If pyinotify is not installed, Fail2ban will use auto.
# gamin:     requires Gamin (a file alteration monitor) to be installed.
#              If Gamin is not installed, Fail2ban will use auto.
# polling:   uses a polling algorithm which does not require external libraries.
# auto:      will try to use the following backends, in order:
#              pyinotify, gamin, polling.
backend = auto

# "usedns" specifies if jails should trust hostnames in logs,
#   warn when DNS lookups are performed, or ignore all hostnames in logs
#
# yes:   if a hostname is encountered, a DNS lookup will be performed.
# warn:  if a hostname is encountered, a DNS lookup will be performed,
#        but it will be logged as a warning.
# no:    if a hostname is encountered, will not be used for banning,
#        but it will be logged as info.
usedns = warn


# This jail corresponds to the standard configuration in Fail2ban.
# The mail-whois action send a notification e-mail with a whois request
# in the body.

[pam-generic]

enabled = false
filter  = pam-generic
action  = iptables-allports[name=pam,protocol=all]
logpath = /var/log/secure


[xinetd-fail]

enabled = false
filter  = xinetd-fail
action  = iptables-allports[name=xinetd,protocol=all]
logpath = /var/log/daemon*log


[ssh-iptables]

enabled  = true
filter   = sshd
action   = iptables[name=SSH, port=ssh, protocol=tcp]
           sendmail-whois[name=SSH, dest=root@localhost, sender=fail2ban@{{ansible_hostname}}, sendername="Fail2Ban"]
logpath  = /var/log/secure
maxretry = 5


[ssh-ddos]

enabled  = false
filter   = sshd-ddos
action   = iptables[name=SSHDDOS, port=ssh, protocol=tcp]
logpath  = /var/log/sshd.log
maxretry = 2


[dropbear]

enabled  = false
filter   = dropbear
action   = iptables[name=dropbear, port=ssh, protocol=tcp]
logpath  = /var/log/messages
maxretry = 5


[proftpd-iptables]

enabled  = false
filter   = proftpd
action   = iptables[name=ProFTPD, port=ftp, protocol=tcp]
           sendmail-whois[name=ProFTPD, dest=root@localhost]
logpath  = /var/log/proftpd/proftpd.log
maxretry = 6


[gssftpd-iptables]

enabled  = false
filter   = gssftpd
action   = iptables[name=GSSFTPd, port=ftp, protocol=tcp]
           sendmail-whois[name=GSSFTPd, dest=root@localhost]
logpath  = /var/log/daemon.log
maxretry = 6


[pure-ftpd]

enabled  = false
filter   = pure-ftpd
action   = iptables[name=pureftpd, port=ftp, protocol=tcp]
logpath  = /var/log/pureftpd.log
maxretry = 6


[wuftpd]

enabled  = false
filter   = wuftpd
action   = iptables[name=wuftpd, port=ftp, protocol=tcp]
logpath  = /var/log/daemon.log
maxretry = 6


[sendmail-auth]

enabled  = false
filter   = sendmail-auth
action   = iptables-multiport[name=sendmail-auth, port="submission,465,smtp", protocol=tcp]
logpath  = /var/log/mail.log


[sendmail-reject]

enabled  = false
filter   = sendmail-reject
action   = iptables-multiport[name=sendmail-auth, port="submission,465,smtp", protocol=tcp]
logpath  = /var/log/mail.log


# This jail forces the backend to "polling".
[sasl-iptables]

enabled  = false
filter   = postfix-sasl
backend  = polling
action   = iptables[name=sasl, port=smtp, protocol=tcp]
           sendmail-whois[name=sasl, dest=root@localhost]
logpath  = /var/log/mail.log


# ASSP SMTP Proxy Jail
[assp]

enabled = false
filter  = assp
action  = iptables-multiport[name=assp,port="25,465,587"]
logpath = /root/path/to/assp/logs/maillog.txt


# Here we use TCP-Wrappers instead of Netfilter/Iptables. "ignoreregex" is
# used to avoid banning the user "myuser".
[ssh-tcpwrapper]

enabled     = false
filter      = sshd
action      = hostsdeny[daemon_list=sshd]
              sendmail-whois[name=SSH, dest=root@localhost]
ignoreregex = for myuser from
logpath     = /var/log/sshd.log


# Here we use blackhole routes for not requiring any additional kernel support
# to store large volumes of banned IPs
[ssh-route]

enabled  = false
filter   = sshd
action   = route
logpath  = /var/log/sshd.log
maxretry = 5


# Here we use a combination of Netfilter/Iptables and IPsets
# for storing large volumes of banned IPs
#
# IPset comes in two versions. See ipset -V for which one to use
# requires the ipset package and kernel support.
[ssh-iptables-ipset4]

enabled  = false
filter   = sshd
action   = iptables-ipset-proto4[name=SSH, port=ssh, protocol=tcp]
logpath  = /var/log/sshd.log
maxretry = 5


[ssh-iptables-ipset6]

enabled  = false
filter   = sshd
action   = iptables-ipset-proto6[name=SSH, port=ssh, protocol=tcp, bantime=600]
logpath  = /var/log/sshd.log
maxretry = 5


# bsd-ipfw is ipfw used by BSD. It uses ipfw tables.
# table number must be unique.
# 
# This will create a deny rule for that table ONLY if a rule 
# for the table doesn't ready exist.
#
[ssh-bsd-ipfw]

enabled  = false
filter   = sshd
action   = bsd-ipfw[port=ssh,table=1]
logpath  = /var/log/auth.log
maxretry = 5


# This jail demonstrates the use of wildcards in "logpath".
# Moreover, it is possible to give other files on a new line.
[apache-tcpwrapper]

enabled  = false
filter	 = apache-auth
action   = hostsdeny
logpath  = /var/log/apache*/*error.log
           /home/www/myhomepage/error.log
maxretry = 6


[apache-modsecurity]

enabled  = false
filter	 = apache-modsecurity
action   = iptables-multiport[name=apache-modsecurity,port="80,443"]
logpath  = /var/log/apache*/*error.log
           /home/www/myhomepage/error.log
maxretry = 2


[apache-overflows]

enabled  = false
filter	 = apache-overflows
action   = iptables-multiport[name=apache-overflows,port="80,443"]
logpath  = /var/log/apache*/*error.log
           /home/www/myhomepage/error.log
maxretry = 2


[apache-nohome]

enabled  = false
filter	 = apache-nohome
action   = iptables-multiport[name=apache-nohome,port="80,443"]
logpath  = /var/log/apache*/*error.log
           /home/www/myhomepage/error.log
maxretry = 2


[nginx-http-auth]

enabled = false
filter  = nginx-http-auth
action  = iptables-multiport[name=nginx-http-auth,port="80,443"]
logpath = /var/log/nginx/error.log


[squid]

enabled = false
filter  = squid
action  = iptables-multiport[name=squid,port="80,443,8080"]
logpath = /var/log/squid/access.log


# The hosts.deny path can be defined with the "file" argument if it is
# not in /etc.
[postfix-tcpwrapper]

enabled  = false
filter   = postfix
action   = hostsdeny[file=/not/a/standard/path/hosts.deny]
           sendmail[name=Postfix, dest=root@localhost]
logpath  = /var/log/postfix.log
bantime  = 300


[cyrus-imap]

enabled = false
filter  = cyrus-imap
action  = iptables-multiport[name=cyrus-imap,port="143,993"]
logpath = /var/log/mail*log


[courierlogin]

enabled = false
filter  = courierlogin
action  = iptables-multiport[name=courierlogin,port="25,110,143,465,587,993,995"]
logpath = /var/log/mail*log


[couriersmtp]

enabled = false
filter  = couriersmtp
action  = iptables-multiport[name=couriersmtp,port="25,465,587"]
logpath = /var/log/mail*log


[qmail-rbl]

enabled = false
filter  = qmail
action  = iptables-multiport[name=qmail-rbl,port="25,465,587"]
logpath = /service/qmail/log/main/current


[sieve]

enabled = false
filter  = sieve
action  = iptables-multiport[name=sieve,port="25,465,587"]
logpath = /var/log/mail*log


# Do not ban anybody. Just report information about the remote host.
# A notification is sent at most every 600 seconds (bantime).
[vsftpd-notification]

enabled  = false
filter   = vsftpd
action   = sendmail-whois[name=VSFTPD, dest=root@localhost]
logpath  = /var/log/vsftpd.log
maxretry = 5
bantime  = 1800


# Same as above but with banning the IP address.
[vsftpd-iptables]

enabled  = false
filter   = vsftpd
action   = iptables[name=VSFTPD, port=ftp, protocol=tcp]
           sendmail-whois[name=VSFTPD, dest=root@localhost]
logpath  = /var/log/vsftpd.log
maxretry = 5
bantime  = 1800


# Ban hosts which agent identifies spammer robots crawling the web
# for email addresses. The mail outputs are buffered.
[apache-badbots]

enabled  = false
filter   = apache-badbots
action   = iptables-multiport[name=BadBots, port="http,https"]
           sendmail-buffered[name=BadBots, lines=5, dest=root@localhost]
logpath  = /var/www/*/logs/access_log
bantime  = 172800
maxretry = 1


# Use shorewall instead of iptables.
[apache-shorewall]

enabled  = false
filter   = apache-noscript
action   = shorewall
           sendmail[name=Postfix, dest=root@localhost]
logpath  = /var/log/apache2/error_log


# Monitor roundcube server
[roundcube-iptables]

enabled  = false
filter   = roundcube-auth
action   = iptables-multiport[name=RoundCube, port="http,https"]
logpath  = /var/log/roundcube/userlogins


# Monitor SOGo groupware server
[sogo-iptables]

enabled  = false
filter   = sogo-auth
# without proxy this would be:
# port    = 20000
action   = iptables-multiport[name=SOGo, port="http,https"]
logpath  = /var/log/sogo/sogo.log


[groupoffice]

enabled  = false
filter   = groupoffice
action   = iptables-multiport[name=groupoffice, port="http,https"]
logpath  = /home/groupoffice/log/info.log 


[openwebmail]

enabled  = false
filter   = openwebmail
logpath  = /var/log/openwebmail.log
action   = ipfw
           sendmail-whois[name=openwebmail, dest=root@localhost]
maxretry = 5


[horde]

enabled  = false
filter   = horde
logpath  = /var/log/horde/horde.log
action   = iptables-multiport[name=horde, port="http,https"]
maxretry = 5


# Ban attackers that try to use PHP's URL-fopen() functionality
# through GET/POST variables. - Experimental, with more than a year
# of usage in production environments.
[php-url-fopen]

enabled  = false
action   = iptables-multiport[name=php-url-open, port="http,https"]
filter   = php-url-fopen
logpath  = /var/www/*/logs/access_log
maxretry = 1


[suhosin]

enabled  = false
filter   = suhosin
action   = iptables-multiport[name=suhosin, port="http,https"]
# adapt the following two items as needed
logpath  = /var/log/lighttpd/error.log
maxretry = 2


[lighttpd-auth]

enabled  = false
filter   = lighttpd-auth
action   = iptables-multiport[name=lighttpd-auth, port="http,https"]
# adapt the following two items as needed
logpath  = /var/log/lighttpd/error.log
maxretry = 2


# This jail uses ipfw, the standard firewall on FreeBSD. The "ignoreip"
# option is overridden in this jail. Moreover, the action "mail-whois" defines
# the variable "name" which contains a comma using "". The characters '' are
# valid too.
[ssh-ipfw]

enabled  = false
filter   = sshd
action   = ipfw[localhost=192.168.0.1]
           sendmail-whois[name="SSH,IPFW", dest=root@localhost]
logpath  = /var/log/auth.log
ignoreip = 168.192.0.1


# !!! WARNING !!!
#   Since UDP is connection-less protocol, spoofing of IP and imitation
#   of illegal actions is way too simple.  Thus enabling of this filter
#   might provide an easy way for implementing a DoS against a chosen
#   victim. See
#    http://nion.modprobe.de/blog/archives/690-fail2ban-+-dns-fail.html
#   Please DO NOT USE this jail unless you know what you are doing.
#
# IMPORTANT: see filter.d/named-refused for instructions to enable logging
# This jail blocks UDP traffic for DNS requests.
# [named-refused-udp]
#
# enabled  = false
# filter   = named-refused
# action   = iptables-multiport[name=Named, port="domain,953", protocol=udp]
#            sendmail-whois[name=Named, dest=root@localhost]
# logpath  = /var/log/named/security.log
# ignoreip = 168.192.0.1

# IMPORTANT: see filter.d/named-refused for instructions to enable logging
# This jail blocks TCP traffic for DNS requests.
[named-refused-tcp]

enabled  = false
filter   = named-refused
action   = iptables-multiport[name=Named, port="domain,953", protocol=tcp]
           sendmail-whois[name=Named, dest=root@localhost]
logpath  = /var/log/named/security.log
ignoreip = 168.192.0.1


[nsd]

enabled = false
filter  = nsd
action  = iptables-multiport[name=nsd-tcp, port="domain", protocol=tcp]
          iptables-multiport[name=nsd-udp, port="domain", protocol=udp]
logpath = /var/log/nsd.log


[asterisk]

enabled  = false
filter   = asterisk
action   = iptables-multiport[name=asterisk-tcp, port="5060,5061", protocol=tcp]
           iptables-multiport[name=asterisk-udp, port="5060,5061", protocol=udp]
           sendmail-whois[name=Asterisk, dest=root@localhost, sender=fail2ban@{{ansible_hostname}}]
logpath  = /var/log/asterisk/messages
maxretry = 10


[freeswitch]

enabled  = false
filter   = freeswitch
logpath  = /var/log/freeswitch.log
maxretry = 10
action   = iptables-multiport[name=freeswitch-tcp, port="5060,5061,5080,5081", protocol=tcp]
           iptables-multiport[name=freeswitch-udp, port="5060,5061,5080,5081", protocol=udp]

[ejabberd-auth]

enabled = false
filter = ejabberd-auth
logpath = /var/log/ejabberd/ejabberd.log
action   = iptables[name=ejabberd, port=xmpp-client, protocol=tcp]

#  Historical support (before https://github.com/fail2ban/fail2ban/issues/37 was fixed )
#  use [asterisk] for new jails
[asterisk-tcp]

enabled  = false
filter   = asterisk
action   = iptables-multiport[name=asterisk-tcp, port="5060,5061", protocol=tcp]
           sendmail-whois[name=Asterisk, dest=root@localhost, sender=fail2ban@{{ansible_hostname}}]
logpath  = /var/log/asterisk/messages
maxretry = 10


#  Historical support (before https://github.com/fail2ban/fail2ban/issues/37 was fixed )
#  use [asterisk] for new jails
[asterisk-udp]

enabled  = false
filter	 = asterisk
action   = iptables-multiport[name=asterisk-udp, port="5060,5061", protocol=udp]
           sendmail-whois[name=Asterisk, dest=root@localhost, sender=fail2ban@{{ansible_hostname}}]
logpath  = /var/log/asterisk/messages
maxretry = 10


[mysqld-iptables]

enabled  = false
filter   = mysqld-auth
action   = iptables[name=mysql, port=3306, protocol=tcp]
           sendmail-whois[name=MySQL, dest=root, sender=fail2ban@{{ansible_hostname}}]
logpath  = /var/log/mysqld.log
maxretry = 5


[mysqld-syslog]

enabled  = false
filter   = mysqld-auth
action   = iptables[name=mysql, port=3306, protocol=tcp]
logpath  = /var/log/daemon.log
maxretry = 5


# Jail for more extended banning of persistent abusers
# !!! WARNING !!!
#   Make sure that your loglevel specified in fail2ban.conf/.local
#   is not at DEBUG level -- which might then cause fail2ban to fall into
#   an infinite loop constantly feeding itself with non-informative lines
[recidive]

enabled  = false
filter   = recidive
logpath  = /var/log/fail2ban.log
action   = iptables-allports[name=recidive,protocol=all]
           sendmail-whois-lines[name=recidive, logpath=/var/log/fail2ban.log]
bantime  = 604800  ; 1 week
findtime = 86400   ; 1 day
maxretry = 5


# PF is a BSD based firewall
[ssh-pf]

enabled  = false
filter   = sshd
action   = pf
logpath  = /var/log/sshd.log
maxretry = 5


[3proxy]

enabled = false
filter  = 3proxy
action  = iptables[name=3proxy, port=3128, protocol=tcp]
logpath = /var/log/3proxy.log


[exim]

enabled = false
filter  = exim
action  = iptables-multiport[name=exim,port="25,465,587"]
logpath = /var/log/exim/mainlog


[exim-spam]

enabled = false
filter  = exim-spam
action  = iptables-multiport[name=exim-spam,port="25,465,587"]
logpath = /var/log/exim/mainlog


[perdition]

enabled = false
filter  = perdition
action  = iptables-multiport[name=perdition,port="110,143,993,995"]
logpath = /var/log/maillog


[uwimap-auth]

enabled = false
filter  = uwimap-auth
action  = iptables-multiport[name=uwimap-auth,port="110,143,993,995"]
logpath = /var/log/maillog


[osx-ssh-ipfw]

enabled  = false
filter   = sshd
action   = osx-ipfw
logpath  = /var/log/secure.log
maxretry = 5


[ssh-apf]

enabled = false
filter  = sshd
action  = apf[name=SSH]
logpath = /var/log/secure
maxretry = 5


[osx-ssh-afctl]

enabled  = false
filter   = sshd
action   = osx-afctl[bantime=600]
logpath  = /var/log/secure.log
maxretry = 5


[webmin-auth]

enabled = false
filter  = webmin-auth
action  = iptables-multiport[name=webmin,port="10000"]
logpath = /var/log/auth.log


# dovecot defaults to logging to the mail syslog facility
# but can be set by syslog_facility in the dovecot configuration.
[dovecot]

enabled = false
filter  = dovecot
action  = iptables-multiport[name=dovecot, port="pop3,pop3s,imap,imaps,submission,465,sieve", protocol=tcp]
logpath = /var/log/mail.log


[dovecot-auth]

enabled = false
filter  = dovecot
action  = iptables-multiport[name=dovecot-auth, port="pop3,pop3s,imap,imaps,submission,465,sieve", protocol=tcp]
logpath = /var/log/secure


[solid-pop3d]

enabled = false
filter  = solid-pop3d
action  = iptables-multiport[name=solid-pop3, port="pop3,pop3s", protocol=tcp]
logpath = /var/log/mail.log


[selinux-ssh]
enabled  = false
filter   = selinux-ssh
action   = iptables[name=SELINUX-SSH, port=ssh, protocol=tcp]
logpath  = /var/log/audit/audit.log
maxretry = 5

# See the IMPORTANT note in action.d/blocklist_de.conf for when to
# use this action
#
# Report block via blocklist.de fail2ban reporting service API
# See action.d/blocklist_de.conf for more information
[ssh-blocklist]

enabled  = false
filter   = sshd
action   = iptables[name=SSH, port=ssh, protocol=tcp]
           sendmail-whois[name=SSH, dest=root@localhost, sender=fail2ban@{{ansible_hostname}}, sendername="Fail2Ban"]
           blocklist_de[email="fail2ban@{{ansible_hostname}}", apikey="xxxxxx", service=%(filter)s]
logpath  = /var/log/sshd.log
maxretry = 20


# consider low maxretry and a long bantime
# nobody except your own Nagios server should ever probe nrpe
[nagios]
enabled  = false
filter   = nagios
action   = iptables[name=Nagios, port=5666, protocol=tcp]
           sendmail-whois[name=Nagios, dest=root@localhost, sender=fail2ban@{{ansible_hostname}}, sendername="Fail2Ban"]
logpath  = /var/log/messages     ; nrpe.cfg may define a different log_facility
maxretry = 1

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