Issue 2487 - Introduce fail2ban module

modules/fail2ban/manifests/filter.pp

+# == Type: fail2ban::filter
+#
+# Manage filter information and files for any custom filter.
+#
+# == Parameters:
+#
+# [*regexes*]
+#   Array of strings containing the regular expressions applied to
+#   the filter.
+#
+# [*ensure*]
+#   Translates directly into the state of the file resource.
+#
+# === Examples:
+#
+#   fail2ban::filter {'CVE-2013-0235':
+#     regexes => [
+#       '^<HOST>.*\"WordPress\/.*',
+#       '^.*\"WordPress\/.*<HOST>.*',
+#     ],
+#     'ensure' => 'present',
+#   }
+#
+define fail2ban::filter (
+  $regexes = [],
+  $ensure = 'present',
+) {
+
+  include fail2ban
+  include stdlib
+
+  if (size($regexes) == 0) and ($ensure == 'present') {
+    fail("An array of one or more regular expressions is needed.")
+  }
+
+  # The $name parameter is used to compose the file name.
+  file {"/etc/fail2ban/filter.d/$name.conf":
+    ensure => $ensure,
+    content => template("fail2ban/filter.erb"),
+    group => 'root',
+    mode => '0644',
+    owner => 'root',
+    require => Package['fail2ban'],
+    notify => Service['fail2ban'],
+  }
+}
+