ipfilter resource

Use the ipfilter Chef InSpec audit resource to test rules defined for ipfilter. The ipfstat utility is used to report on packet filter statistics and filter list. ipfstat -io is used to view the active filtering rule set for the input and the output side of the kernel IP processing. The rule match is done against the output rules of ipfstat -io.

Availability

Install

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

Syntax

An ipfilter resource block declares tests for rules defined for IP Filter:

describe ipfilter do
  it { should have_rule("RULE") }
end

where

• have_rule('RULE') tests the active rule for ipfilter. This must match the entire line taken from 'ipfstat -io'.

Examples

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

Test if there are no restrictions on a loopback interface

describe ipfilter do
  it { should have_rule("pass in quick on lo0 all") }
  it { should have_rule("pass out quick on lo0 all") }
end

Test if there are no restrictions on inside LAN interface named xl0 for private network

describe ipfilter do
  it { should have_rule("pass in quick on xl0 all") }
  it { should have_rule("pass out quick on xl0 all") }
end

Test if there is a rule allowing FTP traffic on the public interface named dc0

describe ipfilter do
  it { should have_rule("pass out quick on dc0 proto tcp from any to any port = ftp flags S/FSRPAU keep state") }
end

Test if there is a rule allowing SSH on the public interface named dc0

describe ipfilter do
  it { should have_rule("pass out quick on dc0 proto tcp from any to any port = ssh flags S/FSRPAU keep state") }
end

Note that the rule specification must exactly match what is in the output of 'ipfstat -io', which depends on how you have 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 output rule of 'ipfstat -io':

it { should have_rule("RULE") }