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135 lines
4 KiB
Text
135 lines
4 KiB
Text
---
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title: About the aws_vpcs Resource
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platform: aws
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---
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# aws\_vpcs
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Use the `aws_vpcs` InSpec audit resource to test properties of some or all AWS Virtual Private Clouds (VPCs).
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A VPC is a networking construct that provides an isolated environment. A VPC is contained in a geographic region, but spans availability zones in that region. A VPC may have multiple subnets, internet gateways, and other networking resources. Computing resources--such as EC2 instances--reside on subnets within the VPC.
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Each VPC is uniquely identified by its VPC ID. In addition, each VPC has a non-unique CIDR IP Address range (such as 10.0.0.0/16) which it manages.
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Every AWS account has at least one VPC, the "default" VPC, in every region.
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<br>
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## Availability
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### Installation
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This resource is distributed along with InSpec itself. You can use it automatically.
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### Version
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This resource first became available in v2.0.16 of InSpec.
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## Syntax
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An `aws_vpcs` resource block uses an optional filter to select a group of VPCs and then tests that group.
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# The control will pass if the filter returns at least one result. Use `should_not` if you expect zero matches.
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# Since you always have at least one VPC, this will always pass.
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describe aws_vpcs do
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it { should exist }
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end
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# Insist that all VPCs use the same DHCP option set.
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describe aws_vpcs.where { dhcp_options_id != 'dopt-12345678' } do
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it { should_not exist }
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end
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<br>
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## Examples
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The following examples show how to use this InSpec audit resource.
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### Check for a Particular VPC ID
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describe aws_vpcs do
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its('vpc_ids') { should include 'vpc-12345678' }
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end
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### Use the VPC IDs to Get a List of Default Security Groups
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aws_vpcs.vpc_ids.each do |vpc_id|
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describe aws_security_group(vpc_id: vpc_id, group_name: 'default') do
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it { should_not allow_in(port: 22) }
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end
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end
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<br>
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## Filter Criteria
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### cidr_block
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Filters the results to include only those VPCs that match the given IPv4 range. This is a string value.
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# We shun the 10.0.0.0/8 space
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describe aws_vpcs.where { cidr_block.start_with?('10') } do
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it { should_not exist }
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end
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### dhcp_option_id
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Filters the results to include only those VPCs that have the given DHCP Option Set.
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# Insist on one DHCP option set for all VPCs.
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describe aws_vpcs.where { dhcp_options_id != 'dopt-12345678' } do
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it { should_not exist }
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end
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## Properties
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### cidr_blocks
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The cidr_blocks property provides a list of the CIDR blocks that the matched VPCs serve as strings.
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describe aws_vpcs do
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# This is simple array membership checking - not subnet membership
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its('cidr_blocks') { should include '179.0.0.0/16' }
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end
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### dhcp_options_ids
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The dhcp_option_set_ids property provides a de-duplicated list of the DHCP Option Set IDs that the matched VPCs use when assigning IPs to resources.
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describe aws_vpcs do
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its('dhcp_options_ids') { should include 'dopt-12345678' }
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end
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### vpc_ids
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The vpc_ids property provides a list of the IDs of the matched VPCs.
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describe aws_vpcs do
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its('vpc_ids') { should include 'vpc-12345678' }
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end
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# Get a list of all VPC IDs
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aws_vpcs.vpc_ids.each do |vpc_id|
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# Do something with vpc_id
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end
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## Matchers
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This InSpec audit resource has the following special matchers. For a full list of available matchers, please visit our [Universal Matchers page](https://www.inspec.io/docs/reference/matchers/).
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### exists
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The control will pass if the filter returns at least one result. Use `should_not` if you expect zero matches.
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# You will always have at least one VPC
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describe aws_vpcs
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it { should exist }
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end
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## AWS Permissions
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Your [Principal](https://docs.aws.amazon.com/IAM/latest/UserGuide/intro-structure.html#intro-structure-principal) will need the `ec2:DescribeVpcs` action with Effect set to Allow.
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You can find detailed documentation at [Actions, Resources, and Condition Keys for Amazon EC2](https://docs.aws.amazon.com/IAM/latest/UserGuide/list_amazonec2.html).
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