Puppet Class: cis_security_hardening::rules::ufw_outbound

Defined in:
manifests/rules/ufw_outbound.pp

Summary

Ensure outbound connections are configured (Not Scored)

Overview

Configure the firewall rules for new outbound connections.

Rationale: If rules are not in place for new outbound connections all packets will be dropped by the default policy preventing network usage.

Examples:

class cis_security_hardening::rules::ufw_outbound {
    enforce => true,
}

Parameters:

  • enforce (Boolean) (defaults to: false) —

    Enforce the rule or just test and log

  • firewall_rules (Hash) (defaults to: {}) —

    Rules for outbound connections



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
 
# File 'manifests/rules/ufw_outbound.pp', line 22

class cis_security_hardening::rules::ufw_outbound (
  Boolean $enforce     = false,
  Hash $firewall_rules = {},
) {
  if $enforce {
    $firewall_rules.each |$title, $data| {
      if cis_security_hardening::hash_key($data, 'action') {
        unless $data['action'] =~ /\W*/ {
          fail("Illegal action: ${data['action']}")
        }
        $action = $data['action']
      } else {
        $action = ''
      }

      if cis_security_hardening::hash_key($data, 'queue') {
        unless $data['queue'] =~ /\W*/ {
          fail("Illegal queue: ${data['queue']}")
        }
        $queue = $data['queue']
      } else {
        $queue =''
      }

      if cis_security_hardening::hash_key($data, 'port') {
        unless $data['port'] =~ /^\d+$/ {
          fail("Illegal port: ${data['port']}")
        }
        $port = $data['port']
      } else {
        $port = ''
      }

      if ($data['queue'] == 'in') {
        if(cis_security_hardening::hash_key($data, 'from')) {
          unless $data['from'] =~ /^[a-zA-Z0-9\-_\.]+$/ {
            fail("Illegal from value: ${data['from']}")
          }
          $from = "from ${data['from']} "
        } else {
          $from = ''
        }

        if (cis_security_hardening::hash_key($data, 'to')) {
          unless $data['to'] =~ /^[a-zA-Z0-9\-_\.]+$/ {
            fail("Illegal to value: ${data['to']}")
          }
          $to = "to ${data['to']} "
        } else {
          $to = ''
        }

        if cis_security_hardening::hash_key($data, 'proto') {
          unless $data['proto'] in ['tcp', 'udp', 'icmp'] {
            fail("Illegal protocol: ${data['proto']}")
          }
          $proto = $data['proto']
        } else {
          $proto = ''
        }

        if($from == '') and ($to == '') {
          $cmd = "ufw allow ${port}/${proto}"
        } else {
          $cmd = "ufw ${action} proto ${proto} ${from}${to}port ${port}"
        }
        $check = "test -z \"$(ufw status verbose | grep -E -i '^${port}/${proto}.*ALLOW ${queue}')\""
      } elsif ($data['queue'] == 'out') {
        $cmd = "ufw ${action} ${queue} to ${data['to']} port ${port}"
        $check = "test -z \"$(ufw status verbose | grep -E -i '^${port}.*ALLOW ${queue}')\""
      } else {
        fail("unknow ufw queue ${data['queue']}")
      }

      exec { $title:
        command => $cmd,
        path    => ['/bin', '/usr/bin', '/sbin', '/usr/sbin'],
        onlyif  => $check,
      }
    }
  }
}