AWSTemplateFormatVersion: 2010-09-09
Description: Enable AWS Config

Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: Recorder Configuration
        Parameters:
          - AllSupported
          - IncludeGlobalResourceTypes
          - ResourceTypes
      - Label:
          default: Delivery Channel Configuration
        Parameters:
          - DeliveryChannelName
          - Frequency
    ParameterLabels:
      AllSupported:
        default: Support all resource types
      IncludeGlobalResourceTypes:
        default: Include global resource types
      ResourceTypes:
        default: List of resource types if not all supported
      DeliveryChannelName:
        default: Configuration delivery channel name
      Frequency:
        default: Snapshot delivery frequency

Parameters:
  SetupConfig:
    Type: String
    Default: "Yes"
    AllowedValues:
      - "Yes"
      - "No"
  AllSupported:
    Type: String
    Default: True
    Description: Indicates whether to record all supported resource types.
    AllowedValues:
      - True
      - False

  IncludeGlobalResourceTypes:
    Type: String
    Default: True
    Description: Indicates whether AWS Config records all supported global resource types.
    AllowedValues:
      - True
      - False

  ResourceTypes:
    Type: List<String>
    Description: A list of valid AWS resource types to include in this recording group, such as AWS::EC2::Instance or AWS::CloudTrail::Trail.
    Default: <All>

  DeliveryChannelName:
    Type: String
    Default: <Generated>
    Description: The name of the delivery channel.

  Frequency:
    Type: String
    Default: 24hours
    Description: The frequency with which AWS Config delivers configuration snapshots.
    AllowedValues:
      - 1hour
      - 3hours
      - 6hours
      - 12hours
      - 24hours

Conditions:
  TurnOnConfig: !Equals
    - !Ref SetupConfig
    - "Yes"
  IsAllSupported: !Equals
    - !Ref AllSupported
    - True
  IsGeneratedDeliveryChannelName: !Equals
    - !Ref DeliveryChannelName
    - <Generated>

Mappings:
  Settings:
    FrequencyMap:
      1hour   : One_Hour
      3hours  : Three_Hours
      6hours  : Six_Hours
      12hours : Twelve_Hours
      24hours : TwentyFour_Hours

Resources:
  ConfigBucket:
    Condition: TurnOnConfig
    DeletionPolicy: Retain
    Type: AWS::S3::Bucket
    Properties:
      BucketEncryption:
          ServerSideEncryptionConfiguration:
            - ServerSideEncryptionByDefault:
                SSEAlgorithm: AES256
      VersioningConfiguration:
          Status: Enabled
      PublicAccessBlockConfiguration:
          BlockPublicAcls : true
          BlockPublicPolicy : true
          IgnorePublicAcls : true
          RestrictPublicBuckets : true
  ConfigBucketPolicy:
    Condition: TurnOnConfig
    DeletionPolicy: Retain
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref ConfigBucket
      PolicyDocument:
        Version: 2012-10-17
        Statement:
          - Sid: AWSConfigBucketPermissionsCheck
            Effect: Allow
            Principal:
              Service:
                - config.amazonaws.com
            Action: s3:GetBucketAcl
            Resource:
              - !Sub "arn:${AWS::Partition}:s3:::${ConfigBucket}"
            Condition:
              StringEquals:
                'aws:SourceAccount':
                  - !Ref AWS::AccountId
          - Sid: AWSConfigBucketDelivery
            Effect: Allow
            Principal:
              Service:
                - config.amazonaws.com
            Action: s3:PutObject
            Resource:
              - !Sub "arn:${AWS::Partition}:s3:::${ConfigBucket}/AWSLogs/${AWS::AccountId}/*"
            Condition:
              StringEquals:
                'aws:SourceAccount':
                  - !Ref AWS::AccountId
          - Sid: AWSConfigBucketSecureTransport
            Action:
              - s3:*
            Effect: Deny
            Resource:
              - !Sub "arn:${AWS::Partition}:s3:::${ConfigBucket}"
              - !Sub "arn:${AWS::Partition}:s3:::${ConfigBucket}/*"
            Principal: "*"
            Condition:
              Bool:
                aws:SecureTransport:
                  false

  ConfigRecorderRole:
    Condition: TurnOnConfig
    DeletionPolicy: Retain
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - config.amazonaws.com
            Action:
              - sts:AssumeRole
      Path: /
      ManagedPolicyArns:
        - !Sub "arn:${AWS::Partition}:iam::aws:policy/service-role/AWS_ConfigRole"

  ConfigRecorder:
    Condition: TurnOnConfig
    DeletionPolicy: Retain
    Type: AWS::Config::ConfigurationRecorder
    DependsOn:
      - ConfigBucketPolicy
    Properties:
      Name: !Sub "AWSVendorInsightsConfigRecorder-${AWS::Region}"
      RoleARN: !GetAtt ConfigRecorderRole.Arn
      RecordingGroup:
        AllSupported: !Ref AllSupported
        IncludeGlobalResourceTypes: !Ref IncludeGlobalResourceTypes
        ResourceTypes: !If
          - IsAllSupported
          - !Ref AWS::NoValue
          - !Ref ResourceTypes

  ConfigDeliveryChannel:
    Condition: TurnOnConfig
    DeletionPolicy: Retain
    Type: AWS::Config::DeliveryChannel
    DependsOn:
      - ConfigBucketPolicy
    Properties:
      Name: !If
        - IsGeneratedDeliveryChannelName
        - !Ref AWS::NoValue
        - !Ref DeliveryChannelName
      ConfigSnapshotDeliveryProperties:
        DeliveryFrequency: !FindInMap
          - Settings
          - FrequencyMap
          - !Ref Frequency
      S3BucketName: !Ref ConfigBucket