Ansible common role

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Home > CentOS > CentOS 6.x > System administration tools > ansible > Ansible roles > Ansible common role

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/jain.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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