Component: aws-config

This component is responsible for configuring AWS Config.

AWS Config service enables you to track changes to your AWS resources over time. It continuously monitors and records configuration changes to your AWS resources and provides you with a detailed view of the relationships between those resources. With AWS Config, you can assess, audit, and evaluate the configurations of your AWS resources for compliance, security, and governance purposes.

Some of the key features of AWS Config include:

• Configuration history: AWS Config maintains a detailed history of changes to your AWS resources, allowing you to see when changes were made, who made them, and what the changes were.
• Configuration snapshots: AWS Config can take periodic snapshots of your AWS resources configurations, giving you a point-in-time view of their configuration.
• Compliance monitoring: AWS Config provides a range of pre-built rules and checks to monitor your resources for compliance with best practices and industry standards.
• Relationship mapping: AWS Config can map the relationships between your AWS resources, enabling you to see how changes to one resource can impact others.
• Notifications and alerts: AWS Config can send notifications and alerts when changes are made to your AWS resources that could impact their compliance or security posture.

Overall, AWS Config provides you with a powerful toolset to help you monitor and manage the configurations of your AWS resources, ensuring that they remain compliant, secure, and properly configured over time.

Prerequisites

As part of CIS AWS Foundations 1.20, this component assumes that a designated support IAM role with the following permissions has been deployed to every account in the organization:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AllowSupport",
            "Effect": "Allow",
            "Action": [
                "support:*"
            ],
            "Resource": "*"
        },
        {
            "Sid": "AllowTrustedAdvisor",
            "Effect": "Allow",
            "Action": "trustedadvisor:Describe*",
            "Resource": "*"
        }
    ]
}

Before deploying this AWS Config component config-bucket and cloudtrail-bucket should be deployed first.

Usage

Stack Level: Regional

NOTE: Since AWS Config is regional AWS service, this component needs to be deployed to all regions.

At the AWS Organizational level, the Components designate an account to be the central collection account and a single region to be the central collection region so that compliance information can be aggregated into a central location.

Logs are typically written to the audit account and AWS Config deployed into to the security account.

Here's an example snippet for how to use this component:

components:
  terraform:
    aws-config:
      vars:
        enabled: true  
        account_map_tenant: core
        az_abbreviation_type: fixed
        # In each AWS account, an IAM role should be created in the main region.
        # If the main region is set to us-east-1, the value of the var.create_iam_role variable should be true.
        # For all other regions, the value of var.create_iam_role should be false.
        create_iam_role: false
        central_resource_collector_account: core-security
        global_resource_collector_region: us-east-1
        config_bucket_env: ue1
        config_bucket_stage: audit
        config_bucket_tenant: core
        conformance_packs:
          - name: Operational-Best-Practices-for-CIS-AWS-v1.4-Level2
            conformance_pack: https://raw.githubusercontent.com/awslabs/aws-config-rules/master/aws-config-conformance-packs/Operational-Best-Practices-for-CIS-AWS-v1.4-Level2.yaml
            parameter_overrides:
              AccessKeysRotatedParamMaxAccessKeyAge: '45'
          - name: Operational-Best-Practices-for-HIPAA-Security.yaml
            conformance_pack: https://raw.githubusercontent.com/awslabs/aws-config-rules/master/aws-config-conformance-packs/Operational-Best-Practices-for-HIPAA-Security.yaml
            parameter_overrides:
          ...
          (etc)
        managed_rules:
          access-keys-rotated:
            identifier: ACCESS_KEYS_ROTATED
            description: "Checks whether the active access keys are rotated within the number of days specified in maxAccessKeyAge. The rule is NON_COMPLIANT if the access keys have not been rotated for more than maxAccessKeyAge number of days."
            input_parameters:
              maxAccessKeyAge: "30"
            enabled: true
            tags: {}

Deployment

Apply to your central region security account

atmos terraform plan aws-config-{central-region} --stack core-{central-region}-security -var=create_iam_role=true

For example when central region is us-east-1:

atmos terraform plan aws-config-ue1 --stack core-ue1-security -var=create_iam_role=true

Apply aws-config to all stacks in all stages.

atmos terraform plan aws-config-{each region} --stack {each region}-{each stage}

Requirements

Name	Version
terraform	>= 1.0.0
aws	>= 4.0
awsutils	>= 0.16.0

Providers

Name	Version
aws	>= 4.0

Modules

Name	Source	Version
account_map	cloudposse/stack-config/yaml//modules/remote-state	1.5.0
aws_config	cloudposse/config/aws	1.1.0
aws_config_label	cloudposse/label/null	0.25.0
aws_team_roles	cloudposse/stack-config/yaml//modules/remote-state	1.5.0
config_bucket	cloudposse/stack-config/yaml//modules/remote-state	1.5.0
conformance_pack	cloudposse/config/aws//modules/conformance-pack	1.1.0
global_collector_region	cloudposse/stack-config/yaml//modules/remote-state	1.5.0
iam_roles	../account-map/modules/iam-roles	n/a
this	cloudposse/label/null	0.25.0
utils	cloudposse/utils/aws	1.3.0

Resources

Name	Type
aws_caller_identity.this	data source
aws_partition.this	data source
aws_region.this	data source

Inputs

Name	Description	Type	Default	Required
account_map_tenant	(Optional) The tenant where the account_map component required by remote-state is deployed.	string	""	no
additional_tag_map	Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id. This is for some rare cases where resources want additional configuration of tags and therefore take a list of maps with tag key, value, and additional configuration.	map(string)	{}	no
attributes	ID element. Additional attributes (e.g. workers or cluster) to add to id, in the order they appear in the list. New attributes are appended to the end of the list. The elements of the list are joined by the delimiter and treated as a single ID element.	list(string)	[]	no
az_abbreviation_type	AZ abbreviation type, fixed or short	string	"fixed"	no
central_resource_collector_account	The name of the account that is the centralized aggregation account.	string	n/a	yes
config_bucket_env	The environment of the AWS Config S3 Bucket	string	n/a	yes
config_bucket_stage	The stage of the AWS Config S3 Bucket	string	n/a	yes
config_bucket_tenant	(Optional) The tenant of the AWS Config S3 Bucket	string	""	no
conformance_packs	List of conformance packs. Each conformance pack is a map with the following keys: name, conformance_pack, parameter_overrides. For example: conformance_packs = [ { name = "Operational-Best-Practices-for-CIS-AWS-v1.4-Level1" conformance_pack = "https://raw.githubusercontent.com/awslabs/aws-config-rules/master/aws-config-conformance-packs/Operational-Best-Practices-for-CIS-AWS-v1.4-Level1.yaml" parameter_overrides = { "AccessKeysRotatedParamMaxAccessKeyAge" = "45" } }, { name = "Operational-Best-Practices-for-CIS-AWS-v1.4-Level2" conformance_pack = "https://raw.githubusercontent.com/awslabs/aws-config-rules/master/aws-config-conformance-packs/Operational-Best-Practices-for-CIS-AWS-v1.4-Level2.yaml" parameter_overrides = { "IamPasswordPolicyParamMaxPasswordAge" = "45" } } ] Complete list of AWS Conformance Packs managed by AWSLabs can be found here: https://github.com/awslabs/aws-config-rules/tree/master/aws-config-conformance-packs	list(object({ name = string conformance_pack = string parameter_overrides = map(string) }))	[]	no
context	Single object for setting entire context at once. See description of individual variables for details. Leave string and numeric variables as null to use default value. Individual variable settings (non-null) override settings in context object, except for attributes, tags, and additional_tag_map, which are merged.	any	{ "additional_tag_map": {}, "attributes": [], "delimiter": null, "descriptor_formats": {}, "enabled": true, "environment": null, "id_length_limit": null, "label_key_case": null, "label_order": [], "label_value_case": null, "labels_as_tags": [ "unset" ], "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {}, "tenant": null }	no
create_iam_role	Flag to indicate whether an IAM Role should be created to grant the proper permissions for AWS Config	bool	false	no
delegated_accounts	The account IDs of other accounts that will send their AWS Configuration or Security Hub data to this account	set(string)	null	no
delimiter	Delimiter to be used between ID elements. Defaults to - (hyphen). Set to "" to use no delimiter at all.	string	null	no
descriptor_formats	Describe additional descriptors to be output in the descriptors output map. Map of maps. Keys are names of descriptors. Values are maps of the form {<br/> format = string<br/> labels = list(string)<br/>} (Type is any so the map values can later be enhanced to provide additional options.) format is a Terraform format string to be passed to the format() function. labels is a list of labels, in order, to pass to format() function. Label values will be normalized before being passed to format() so they will be identical to how they appear in id. Default is {} (descriptors output will be empty).	any	{}	no
enabled	Set to false to prevent the module from creating any resources	bool	null	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	string	null	no
global_environment	Global environment name	string	"gbl"	no
global_resource_collector_region	The region that collects AWS Config data for global resources such as IAM	string	n/a	yes
iam_role_arn	The ARN for an IAM Role AWS Config uses to make read or write requests to the delivery channel and to describe the AWS resources associated with the account. This is only used if create_iam_role is false. If you want to use an existing IAM Role, set the variable to the ARN of the existing role and set create_iam_role to false. See the AWS Docs for further information: http://docs.aws.amazon.com/config/latest/developerguide/iamrole-permissions.html	string	null	no
iam_roles_environment_name	The name of the environment where the IAM roles are provisioned	string	"gbl"	no
id_length_limit	Limit id to this many characters (minimum 6). Set to 0 for unlimited length. Set to null for keep the existing setting, which defaults to 0. Does not affect id_full.	number	null	no
label_key_case	Controls the letter case of the tags keys (label names) for tags generated by this module. Does not affect keys of tags passed in via the tags input. Possible values: lower, title, upper. Default value: title.	string	null	no
label_order	The order in which the labels (ID elements) appear in the id. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.	list(string)	null	no
label_value_case	Controls the letter case of ID elements (labels) as included in id, set as tag values, and output by this module individually. Does not affect values of tags passed in via the tags input. Possible values: lower, title, upper and none (no transformation). Set this to title and set delimiter to "" to yield Pascal Case IDs. Default value: lower.	string	null	no
labels_as_tags	Set of labels (ID elements) to include as tags in the tags output. Default is to include all labels. Tags with empty values will not be included in the tags output. Set to [] to suppress all generated tags. Notes: The value of the name tag, if included, will be the id, not the name. Unlike other null-label inputs, the initial setting of labels_as_tags cannot be changed in later chained modules. Attempts to change it will be silently ignored.	set(string)	[ "default" ]	no
managed_rules	A list of AWS Managed Rules that should be enabled on the account. See the following for a list of possible rules to enable: https://docs.aws.amazon.com/config/latest/developerguide/managed-rules-by-aws-config.html Example: managed_rules = { access-keys-rotated = { identifier = "ACCESS_KEYS_ROTATED" description = "Checks whether the active access keys are rotated within the number of days specified in maxAccessKeyAge. The rule is NON_COMPLIANT if the access keys have not been rotated for more than maxAccessKeyAge number of days." input_parameters = { maxAccessKeyAge : "90" } enabled = true tags = {} } }	map(object({ description = string identifier = string input_parameters = any tags = map(string) enabled = bool }))	{}	no
name	ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'. This is the only ID element not also included as a tag. The "name" tag is set to the full id string. There is no tag with the value of the name input.	string	null	no
namespace	ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique	string	null	no
privileged	True if the default provider already has access to the backend	bool	false	no
regex_replace_chars	Terraform regular expression (regex) string. Characters matching the regex will be removed from the ID elements. If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.	string	null	no
region	AWS Region	string	n/a	yes
root_account_stage	The stage name for the Organization root (master) account	string	"root"	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	string	null	no
tags	Additional tags (e.g. {'BusinessUnit': 'XYZ'}). Neither the tag keys nor the tag values will be modified by this module.	map(string)	{}	no
tenant	ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for	string	null	no

Outputs

Name	Description
aws_config_configuration_recorder_id	The ID of the AWS Config Recorder
aws_config_iam_role	The ARN of the IAM Role used for AWS Config
storage_bucket_arn	Storage Config bucket ARN
storage_bucket_id	Storage Config bucket ID

References

• AWS Config Documentation
• Cloud Posse's upstream component
• Conformance Packs documentation
• AWS Managed Sample Conformance Packs