ip6tables resource

Use the ip6tables Chef InSpec audit resource to test rules that are defined in ip6tables, which maintains tables of IP packet filtering rules for IPv6. There may be more than one table. Each table contains one (or more) chains (both built-in and custom). A chain is a list of rules that match packets. When the rule matches, the rule defines what target to assign to the packet.

Availability

Install

This resource is distributed with Chef InSpec and is automatically available for use.

Version

This resource first became available in v4.6.9 of InSpec.

Syntax

A ip6tables resource block declares tests for rules in IP tables:

describe ip6tables(rule:'name', table:'name', chain: 'name') do
  it { should have_rule('RULE') }
end

where

• ip6tables() may specify any combination of rule, table, or chain
• rule:'name' is the name of a rule that matches a set of packets
• table:'name' is the packet matching table against which the test is run
• chain: 'name' is the name of a user-defined chain or one of ACCEPT, DROP, QUEUE, or RETURN
• have_rule('RULE') tests that rule in the ip6tables list. This must match the entire line taken from ip6tables -S CHAIN.

Examples

The following examples show how to use this Chef InSpec audit resource.

Test if the INPUT chain is in default ACCEPT mode

describe ip6tables do
  it { should have_rule('-P INPUT ACCEPT') }
end

Test if the INPUT chain from the mangle table is in ACCEPT mode

describe ip6tables(table:'mangle', chain: 'INPUT') do
  it { should have_rule('-P INPUT ACCEPT') }
end

Test if there is a rule allowing Postgres (5432/TCP) traffic

describe ip6tables do
  it { should have_rule('-A INPUT -p tcp -m tcp -m multiport --dports 5432 -m comment --comment "postgres" -j ACCEPT') }
end

Note that the rule specification must exactly match what’s in the output of ip6tables -S INPUT, which will depend on how you’ve built your rules.

Matchers

For a full list of available matchers, see our Universal Matchers page.

This resource has the following special matchers.

have_rule

The have_rule matcher tests the named rule against the information in the ip6tables file:

it { should have_rule('RULE') }