Port Resource

Use the port Chef InSpec audit resource to test basic port properties, such as port, process, if it’s listening.

Availability

Installation

This resource is distributed along with Chef InSpec itself. You can use it automatically.

Version

This resource first became available in v1.0.0 of InSpec.

Syntax

A port resource block declares a port, and then depending on what needs to be tested, a process, protocol, process identifier, and its state (is it listening?):

describe port(514) do
  it { should be_listening }
  its('processes') {should include 'syslog'}
end

where the processes returns the processes listening on port 514.

A filter may specify an attribute:

describe port.where { protocol =~ /tcp/ && port > 22 && port < 80 } do
  it { should_not be_listening }
end

where

.where{} specifies a block in which one (or more) attributes—port, address, protocol, process, pid, or listening?—-scope the test to ports that match those attributes

For example, to test if the SSH daemon is available on a Linux machine via the default port (22):

describe port(22) do
  its('processes') { should include 'sshd' }
  its('protocols') { should include 'tcp' }
  its('addresses') { should include '0.0.0.0' }
end

Properties

address

The addresses property tests if the specified address is associated with a port:

its('addresses') { should include '0.0.0.0' }

be_listening

The be_listening property tests if the port is listening for traffic:

it { should be_listening }

pids

The pids property tests the process identifiers (PIDs):

its('pids') { should cmp 27808 }

processes

The processes property tests if the named process is running on the system:

its('processes') { should cmp 'syslog' }

protocols

The protocols property tests the Internet protocol: ICMP ('icmp'), TCP ('tcp' or 'tcp6'), or UDP ('udp' or 'udp6'):

its('protocols') { should include 'tcp' }

or for the IPv6 protocol:

its('protocols') { should include 'tcp6' }

Examples

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

Test port 80, listening with the TCP protocol

describe port(80) do
  it { should be_listening }
  its('protocols') { should cmp 'tcp' }
end

Test port 80, on a specific address

A specific port address may be checked using either of the following examples:

describe port(80) do
  it { should be_listening }
  its('addresses') {should include '0.0.0.0'}
end

or:

describe port('0.0.0.0', 80) do
  it { should be_listening }
end

Test port 80, listening with TCP version IPv6 protocol

describe port(80) do
  it { should be_listening }
  its('protocols') { should cmp 'tcp6' }
end

Test that only secure ports accept requests

describe port(80) do
  it { should_not be_listening }
end

describe port(443) do
  it { should be_listening }
  its('protocols') { should cmp 'tcp' }
end

Verify port 65432 is not listening

describe port(22) do
  it { should be_listening }
  its('protocols') { should include('tcp') }
  its('protocols') { should_not include('udp') }
end

describe port(65432) do
  it { should_not be_listening }
end

Matchers

For a full list of available matchers, please visit our matchers page.

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