Munin contributed plugins

#!/usr/bin/env ruby

# Plugin to monitor the number of invalid access to sshd per country

#

# Require read permitions for SYSLOG

#    ref) ls -l /var/log/secure

# Require geoip rubygem

#    ref) http://geoip.rubyforge.org/

# Require GeoIP-database for searching ip or host for the country

#    ref) http://www.maxmind.com/app/geoip_country

#

# Parameters:

#       config   (required)

#       autoconf (optional - used by munin-config)

#

# $Log$

# Revision 1.0  2010/12/25 11:56:12 hirata yoshiyuki

#     released.

#

# Magick markers (optional):

#%# family=auto

#%# capabilities=autoconf

#

# config example for /etc/munin/plugin-conf.d/munin-node

#[sshd_invalid_countries_ruby]

#user root

#group root

#env.logfile /var/log/secure

#env.geoip /home/you/GeoIP.dat

#env.loadpath /usr/local/lib/ruby/gems/1.9.1/gems/geoip-0.8.8/lib/

require (ENV['loadpath'] || '') + 'geoip'

SYSLOG   = ENV['syslog'] || '/var/log/secure'

GEOIP_DB = ENV['geoip']  || '/var/www/conf/bbs/GeoIP.dat'

AWK_CMD  = 'awk \'/sshd\[.*Did not receive identification string/{print $12} ' +

                 '/sshd\[.*Failed password for (root|ROOT)/{print $11} ' +

                 '/sshd\[.*Invalid user/{print $10}a\' < ' + SYSLOG

def getInvalids

  c={}

  wholeips = `#{AWK_CMD}`.split("\n")

  uniqueips = wholeips.inject({}) do |hash, key|

    hash.include?(key) ? hash[key] += 1 : hash[key] = 1;

    hash

  end

  geoip = GeoIP.new(GEOIP_DB)

  uniqueips.each do |ip,cnt|

    begin

      country = geoip.country(ip)[5]

      c[country] = c[country] ? c[country] + cnt : cnt

    rescue

      c['Unknown'] = c['Unknown'] ? c['Unknown'] + cnt : cnt

    end

  end

  c = c.to_a.sort {|a,b| a[0] <=> b[0]}

  c

end

case ARGV[0]

when 'autoconf'

  begin

    fh = open(SYSLOG, 'r')

  rescue

    puts 'no'

    exit 1

  else

    puts 'yes'

    exit 0

  end

when 'config'

  puts 'graph_title SSHD invalid countries from ' + SYSLOG

  puts 'graph_args --base 1000 -l 0'

  puts 'graph_vlabel number of invalid access per country'

  puts 'graph_category security'

  puts 'graph_info This graph shows the countries of invalid access to sshd.'

  getInvalids.each {|k,v| puts k + '.label ' + k}

  exit 0

else

  getInvalids.each {|k,v| puts k + '.value ' + v.to_s}

end