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142 lines
3.8 KiB
Text
142 lines
3.8 KiB
Text
---
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title: About the aws_subnets Resource
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platform: aws
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---
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# aws\_subnets
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Use the `aws_subnets` Chef InSpec audit resource to test properties of some or all subnets.
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Subnets are networks within a VPC that can have their own block of IP address's and ACL's.
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VPCs span across all availability zones in AWS, while a subnet in a VPC can only span a single availability zone.
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Separating IP addresses allows for protection if there is a failure in one availability zone.
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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 Chef 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_subnets` resource block uses an optional filter to select a group of subnets and then tests that group.
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# Test all subnets within a single vpc
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describe aws_subnets.where(vpc_id: 'vpc-12345678') do
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its('subnet_ids') { should include 'subnet-12345678' }
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its('subnet_ids') { should include 'subnet-98765432' }
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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 Chef InSpec audit resource.
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As this is the initial release of `aws_subnets`, its limited functionality precludes examples.
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<br>
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## Filter Criteria
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* `vpc_id`, `subnet_id`
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## Filter Examples
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### vpc\_id
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A string identifying the VPC which may or may not contain subnets.
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# Look for all subnets within a vpc.
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describe aws_subnets.where( vpc_id: 'vpc-12345678') do
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its('subnet_ids') { should include 'subnet-12345678' }
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its('subnet_ids') { should include 'subnet-98765432' }
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end
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### subnet\_id
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A string identifying a specific subnet.
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# Examine a specific subnet
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describe aws_subnets.where(subnet_id: 'subnet-12345678') do
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its('cidr_blocks') { should eq ['10.0.1.0/24'] }
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end
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<br>
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## Properties
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* `cidr_blocks`, `states`, `subnet_ids`,`vpc_ids`
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<br>
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## Property Examples
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### cidr\_blocks
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Provides a string that contains the cidr block of ip addresses that can be given in the subnet.
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# Examine a specific subnets cidr_blocks
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describe aws_subnets.where( subnet_id: 'subnet-12345678') do
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its('cidr_blocks') { should eq ['10.0.1.0/24'] }
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end
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### states
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Provides an array of strings including if the subnets are available.
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# Examine a specific vpcs Subnet IDs
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describe aws_subnets.where( vpc_id: 'vpc-12345678') do
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its('states') { should_not include 'pending' }
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end
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### subnet\_ids
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Provides an array of strings containing the subnet IDs associated with a vpc.
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# Examine a specific vpcs Subnet IDs
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describe aws_subnets.where( vpc_id: 'vpc-12345678') do
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its('subnet_ids') { should include 'subnet-12345678' }
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its('subnet_ids') { should include 'subnet-98765432' }
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end
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### vpc\_ids
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Provides an array containing a string of the vpc_id associated with a subnet.
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# Examine a specific subnets VPC IDS
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describe aws_subnets.where( subnet_id: 'subnet-12345678') do
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its('vpc_ids') { should include 'vpc-12345678' }
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end
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<br>
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## Matchers
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For a full list of available matchers, please visit our [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 dont always have subnets, so you can test if there are any.
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describe aws_subnets
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it { should exist }
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end
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# Test that there are subnets in a vpc
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describe aws_subnets.where(vpc_id: 'vpc-12345678')
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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:DescribeSubnets` 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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