inspec/docs/resources/aws_ec2_security_groups.md

title
About the aws_ec2_security_groups Resource

aws_ec2_security_groups

Use the aws_ec2_security_groups InSpec audit resource to test properties of some or all security groups.

Security groups are a networking construct which contain ingress and egress rules for network communications. Security groups may be attached to EC2 instances, as well as certain other AWS resources. Along with Network Access Control Lists, Security Groups are one of the two main mechanisms of enforcing network-level security.

Syntax

An aws_ec2_security_groups resource block uses an optional filter to select a group of security groups and then tests that group.

# Verify you have more than the default security group
describe aws_ec2_security_groups do
  its('entries.count') { should be > 1 }
end

Examples

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

As this is the initial release of aws_ec2_security_groups, its limited functionality precludes examples.

Matchers

exists

The control will pass if the filter returns at least one result. Use should_not if you expect zero matches.

# You will always have at least one SG, the VPC default SG
describe aws_ec2_security_groups
  it { should exist }
end   

Filter Criteria

vpc_id

A string identifying the VPC which contains the security group.

# Look for a particular security group in just one VPC
describe aws_ec2_security_groups.where( vpc_id: 'vpc-12345678') do
  its('group_ids') { should include('sg-abcdef12')}
end

group_name

A string identifying a group. Since groups are contained in VPCs, group names are unique within the AWS account, but not across VPCs.

# Examine the default security group in all VPCs
describe aws_ec2_security_groups.where( group_name: 'default') do
  it { should exist }
end

Properties

group_ids

Provides a list of all security group IDs matched.

describe aws_ec2_security_groups do
  its('group_ids') { should include('sg-12345678') }
end

entries

Provides access to the raw results of the query. This can be useful for checking counts and other advanced operations.

# Allow at most 100 security groups on the account
describe aws_ec2_security_groups do
  its('entries.count') { should be <= 100}
end