########################################################################
# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0
########################################################################
AWSTemplateFormatVersion: 2010-09-09
Description:
  This template enables AWS Config in the Control Tower Management account and adds the Management account to the AWS Config Aggregator in the Control
  Tower Audit account. - 'config_management_account' solution in the repo, https://github.com/aws-samples/aws-security-reference-architecture-examples
  (sra-1ssgnse2s)
Metadata:
  SRA:
    Version: 1.2
    Entry: Parameters for deploying solution without resolving SSM parameters
    Order: 1
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: General Properties
        Parameters:
          - pSRASolutionName
          - pSRASolutionVersion
          - pSRAStagingS3BucketName
          - pAuditAccountId
          - pLogArchiveAccountId
          - pOrganizationId
          - pHomeRegion
      - Label:
          default: Config Recorder Properties
        Parameters:
          - pConfigRegionsToEnable
          - pAllSupported
          - pIncludeGlobalResourceTypes
          - pResourceTypes
      - Label:
          default: Config Delivery Channel Properties
        Parameters:
          - pFrequency
          - pKmsKeyArn
      - Label:
          default: General Lambda Function Properties
        Parameters:
          - pCreateLambdaLogGroup
          - pLambdaLogGroupRetention
          - pLambdaLogGroupKmsKey
          - pLambdaLogLevel
    ParameterLabels:
      pAllSupported:
        default: All Supported
      pAuditAccountId:
        default: Audit Account ID
      pConfigRegionsToEnable:
        default: AWS Config Regions to Enable
      pCreateLambdaLogGroup:
        default: Create Lambda Log Group
      pFrequency:
        default: Frequency
      pHomeRegion:
        default: Control Tower Home Region
      pIncludeGlobalResourceTypes:
        default: Include Global Resource Types
      pKmsKeyArn:
        default: (Optional) KMS Key ARN
      pLambdaLogGroupKmsKey:
        default: (Optional) Lambda Logs KMS Key
      pLambdaLogGroupRetention:
        default: Lambda Log Group Retention
      pLambdaLogLevel:
        default: Lambda Log Level
      pLogArchiveAccountId:
        default: Log Archive Account ID
      pOrganizationId:
        default: Organization ID
      pResourceTypes:
        default: (Optional) Resource Types
      pSRASolutionName:
        default: SRA Solution Name
      pSRASolutionVersion:
        default: SRA Solution Version
      pSRAStagingS3BucketName:
        default: SRA Staging S3 Bucket Name

Parameters:
  pAllSupported:
    AllowedValues: ['true', 'false']
    Default: 'true'
    Description: Indicates whether to record all supported resource types. If set to 'false', then the 'Resource Types' parameter must have a value.
    Type: String
  pAuditAccountId:
    AllowedPattern: '^\d{12}$'
    ConstraintDescription: Must be 12 digits.
    Description: AWS Account ID of the Control Tower Audit account.
    Type: String
  pConfigRegionsToEnable:
    AllowedPattern: '^([a-z0-9-]{1,64})$|^(([a-z0-9-]{1,64},)*[a-z0-9-]{1,64})$'
    ConstraintDescription:
      Only lowercase letters, numbers, and hyphens ('-') allowed. (e.g. us-east-1) Additional AWS regions can be provided, separated by commas without
      spaces. (e.g. us-east-1,ap-southeast-2)
    Description: AWS regions to enable AWS Config (2+ regions, separate by commas)
    Type: String
  pCreateLambdaLogGroup:
    AllowedValues: ['true', 'false']
    Default: 'false'
    Description:
      Indicates whether a CloudWatch Log Group should be explicitly created for the Lambda function, to allow for setting a Log Retention and/or KMS
      Key for encryption.
    Type: String
  pFrequency:
    AllowedValues: [1hour, 3hours, 6hours, 12hours, 24hours]
    Default: 1hour
    Description: The frequency with which AWS Config delivers configuration snapshots.
    Type: String
  pHomeRegion:
    AllowedPattern: '^[a-z0-9-]{1,64}$'
    ConstraintDescription: AWS Region Example - 'us-east-1'
    Description: Name of the Control Tower home region
    Type: String
  pIncludeGlobalResourceTypes:
    AllowedValues: ['true', 'false']
    Default: 'true'
    Description: Indicates whether AWS Config records all supported global resource types.
    Type: String
  pKmsKeyArn:
    AllowedPattern: '^$|^arn:(aws[a-zA-Z-]*)?:kms:[a-z0-9-]+:\d{12}:key\/[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$'
    ConstraintDescription: Key ARN example - arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab
    Default: ''
    Description:
      (Optional) KMS key ARN to use for encrypting the AWS Config configuration snapshots and history files when storing in the S3 bucket in the Log
      Archive account. If empty, snapshots and history files will be encrypted based on the Default Encryption setting of the S3 bucket.
    Type: String
  pLambdaLogGroupKmsKey:
    AllowedPattern: '^$|^arn:(aws[a-zA-Z-]*){1}:kms:[a-z0-9-]+:\d{12}:key\/[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$'
    ConstraintDescription: 'Key ARN example:  arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab'
    Default: ''
    Description:
      (Optional) KMS Key ARN to use for encrypting the Lambda logs data. If empty, encryption is enabled with CloudWatch Logs managing the server-side
      encryption keys.
    Type: String
  pLambdaLogGroupRetention:
    AllowedValues: [1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653]
    Default: 14
    Description: Specifies the number of days you want to retain log events
    Type: String
  pLambdaLogLevel:
    AllowedValues: [INFO, ERROR, DEBUG]
    Default: INFO
    Description: Lambda Function Logging Level
    Type: String
  pLogArchiveAccountId:
    AllowedPattern: '^\d{12}$'
    ConstraintDescription: Must be 12 digits.
    Description: AWS Account ID of the Control Tower Log Archive account.
    Type: String
  pOrganizationId:
    AllowedPattern: '^o-[a-z0-9]{10,32}$'
    ConstraintDescription: Must start with 'o-' followed by from 10 to 32 lowercase letters or digits. (e.g. o-abc1234567)
    Description: AWS Organizations ID
    Type: String
  pResourceTypes:
    AllowedPattern: '^$|^([a-zA-Z]+::[a-zA-Z]+::[a-zA-Z]+)$|^(([a-zA-Z]+::[a-zA-Z]+::[a-zA-Z]+(,|, ))*[a-zA-Z]+::[a-zA-Z]+::[a-zA-Z]+)$'
    Default: ''
    Description:
      (Optional) A list of valid AWS resource types to include in this recording group. Eg. AWS::CloudTrail::Trail. If 'All Supported' parameter is
      set to 'false', then this parameter becomes required.
    Type: String
  pSRASolutionName:
    AllowedValues: [sra-config-management-account]
    Default: sra-config-management-account
    Description: The SRA solution name. The default value is the folder name of the solution
    Type: String
  pSRASolutionVersion:
    AllowedValues: [v1.2]
    Default: v1.2
    Description: The SRA solution version. Used to trigger updates on the nested StackSets.
    Type: String
  pSRAStagingS3BucketName:
    AllowedPattern: '^(?=^.{3,63}$)(?!.*[.-]{2})(?!.*[--]{2})(?!^(?:(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(\.(?!$)|$)){4}$)(^(([a-z0-9]|[a-z0-9][a-z0-9\-]*[a-z0-9])\.)*([a-z0-9]|[a-z0-9][a-z0-9\-]*[a-z0-9])$)'
    ConstraintDescription:
      SRA Staging S3 bucket name can include numbers, lowercase letters, uppercase letters, and hyphens (-). It cannot start or end with a hyphen (-).
    Description:
      SRA Staging S3 bucket name for the artifacts relevant to solution. (e.g., lambda zips, CloudFormation templates) S3 bucket name can include
      numbers, lowercase letters, uppercase letters, and hyphens (-). It cannot start or end with a hyphen (-).
    Type: String

Rules:
  ResourceTypesValidation:
    RuleCondition: !Equals [!Ref pResourceTypes, '']
    Assertions:
      - AssertDescription: "'Resource Types' parameter is required if the 'All Supported' parameter is set to 'true'."
        Assert: !Equals [!Ref pAllSupported, 'true']

Resources:
  rConfigRoleStack:
    Type: AWS::CloudFormation::Stack
    DeletionPolicy: Delete
    UpdateReplacePolicy: Delete
    Properties:
      TemplateURL: !Sub https://${pSRAStagingS3BucketName}.s3.${AWS::Region}.${AWS::URLSuffix}/${pSRASolutionName}/templates/sra-config-management-account-role.yaml
      Tags:
        - Key: sra-solution
          Value: !Ref pSRASolutionName

  rConfigStackSet:
    DependsOn: rConfigRoleStack
    Type: AWS::CloudFormation::StackSet
    Properties:
      StackSetName: sra-config-management-account
      AdministrationRoleARN: !Sub arn:${AWS::Partition}:iam::${AWS::AccountId}:role/service-role/AWSControlTowerStackSetRole
      CallAs: SELF
      Description: !Sub ${pSRASolutionVersion} - Enables AWS Config in the Control Tower Management account.
      ExecutionRoleName: AWSControlTowerExecution
      ManagedExecution:
        Active: true
      OperationPreferences:
        FailureTolerancePercentage: 0
        MaxConcurrentPercentage: 100
        RegionConcurrencyType: PARALLEL
      PermissionModel: SELF_MANAGED
      StackInstancesGroup:
        - DeploymentTargets:
            Accounts:
              - !Ref AWS::AccountId
          Regions: !Split [',', !Ref pConfigRegionsToEnable]
      TemplateURL: !Sub https://${pSRAStagingS3BucketName}.s3.${AWS::Region}.${AWS::URLSuffix}/${pSRASolutionName}/templates/sra-config-management-account.yaml
      Tags:
        - Key: sra-solution
          Value: !Ref pSRASolutionName
      Parameters:
        - ParameterKey: pAllSupported
          ParameterValue: !Ref pAllSupported
        - ParameterKey: pAuditAccountId
          ParameterValue: !Ref pAuditAccountId
        - ParameterKey: pFrequency
          ParameterValue: !Ref pFrequency
        - ParameterKey: pHomeRegion
          ParameterValue: !Ref pHomeRegion
        - ParameterKey: pIncludeGlobalResourceTypes
          ParameterValue: !Ref pIncludeGlobalResourceTypes
        - ParameterKey: pKmsKeyArn
          ParameterValue: !Ref pKmsKeyArn
        - ParameterKey: pLogArchiveAccountId
          ParameterValue: !Ref pLogArchiveAccountId
        - ParameterKey: pOrganizationId
          ParameterValue: !Ref pOrganizationId
        - ParameterKey: pResourceTypes
          ParameterValue: !Ref pResourceTypes

  rConfigAggregatorStack:
    Type: AWS::CloudFormation::Stack
    DeletionPolicy: Delete
    DependsOn: rConfigStackSet
    UpdateReplacePolicy: Delete
    Properties:
      TemplateURL: !Sub https://${pSRAStagingS3BucketName}.s3.${AWS::Region}.${AWS::URLSuffix}/${pSRASolutionName}/templates/sra-config-management-account-update-aggregator.yaml
      Tags:
        - Key: sra-solution
          Value: !Ref pSRASolutionName
      Parameters:
        pAuditAccountId: !Ref pAuditAccountId
        pCreateLambdaLogGroup: !Ref pCreateLambdaLogGroup
        pLambdaLogGroupKmsKey: !Ref pLambdaLogGroupKmsKey
        pLambdaLogGroupRetention: !Ref pLambdaLogGroupRetention
        pLambdaLogLevel: !Ref pLambdaLogLevel
        pOrganizationId: !Ref pOrganizationId
        pSRAStagingS3BucketName: !Ref pSRAStagingS3BucketName