Root Account Security Monitoring Package

AWSTemplateFormatVersion: '2010-09-09'
Description: ''
Resources:
  S3SharedBucket:
    Type: 'AWS::S3::Bucket'
    Properties:
      LoggingConfiguration: {}
      AccessControl: LogDeliveryWrite
      BucketEncryption:
        ServerSideEncryptionConfiguration:
          - ServerSideEncryptionByDefault:
              SSEAlgorithm: AES256
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        BlockPublicPolicy: true
  BucketPolicy:
    Type: 'AWS::S3::BucketPolicy'
    Properties:
      Bucket:
        Ref: S3SharedBucket
      PolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Principal:
              Service:
                - cloudtrail.amazonaws.com
                - config.amazonaws.com
            Action:
              - 's3:GetBucketAcl'
            Resource:
              - 'Fn::GetAtt':
                  - S3SharedBucket
                  - Arn
            Effect: Allow
            Condition: {}
          - Principal:
              Service:
                - cloudtrail.amazonaws.com
                - config.amazonaws.com
            Action:
              - 's3:PutObject'
            Resource:
              - 'Fn::Join':
                  - ''
                  - - ''
                    - 'Fn::GetAtt':
                        - S3SharedBucket
                        - Arn
                    - /*
            Effect: Allow
            Condition:
              StringEquals:
                's3:x-amz-acl': bucket-owner-full-control
    DependsOn: S3SharedBucket
  CloudTrail:
    Type: 'AWS::CloudTrail::Trail'
    Properties:
      TrailName: ManagementEventsTrail
      IsLogging: true
      EnableLogFileValidation: true
      EventSelectors:
        - IncludeManagementEvents: true
          ReadWriteType: All
      IsMultiRegionTrail: true
      IncludeGlobalServiceEvents: true
      S3BucketName:
        Ref: S3SharedBucket
      CloudWatchLogsLogGroupArn:
        'Fn::GetAtt':
          - CWLogGroupForCloudTrail
          - Arn
      CloudWatchLogsRoleArn:
        'Fn::GetAtt':
          - IamRoleForCwLogs
          - Arn
    DependsOn:
      - BucketPolicy
  IamRoleForCwLogs:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Sid: ''
            Effect: Allow
            Principal:
              Service: cloudtrail.amazonaws.com
            Action: 'sts:AssumeRole'
      Policies:
        - PolicyName: allow-access-to-cw-logs
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - 'logs:CreateLogStream'
                  - 'logs:PutLogEvents'
                Resource: '*'
  CWLogGroupForCloudTrail:
    Type: 'AWS::Logs::LogGroup'
    Properties:
      LogGroupName: CloudTrailLogs
      RetentionInDays: 90
  ConfigurationRecorder:
    Type: 'AWS::Config::ConfigurationRecorder'
    Properties:
      RoleARN:
        'Fn::GetAtt':
          - IamRoleForAwsConfig
          - Arn
      RecordingGroup:
        AllSupported: true
        IncludeGlobalResourceTypes: true
  DeliveryChannel:
    Type: 'AWS::Config::DeliveryChannel'
    Properties:
      S3BucketName:
        Ref: S3SharedBucket
  IamRoleForAwsConfig:
    Type: 'AWS::IAM::Role'
    Properties:
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AWSConfigRole'
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Sid: ''
            Effect: Allow
            Principal:
              Service: config.amazonaws.com
            Action: 'sts:AssumeRole'
      Policies:
        - PolicyName: allow-access-to-config-s3-bucket
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - 's3:PutObject'
                Resource:
                  - 'Fn::Join':
                      - ''
                      - - 'Fn::GetAtt':
                            - S3SharedBucket
                            - Arn
                        - /*
                Condition:
                  StringLike:
                    's3:x-amz-acl': bucket-owner-full-control
              - Effect: Allow
                Action:
                  - 's3:GetBucketAcl'
                Resource:
                  'Fn::GetAtt':
                    - S3SharedBucket
                    - Arn
      RoleName: iamRoleForAWSConfig
  SnsTopic1:
    Type: 'AWS::SNS::Topic'
    Properties:
      Subscription:
        - Endpoint: email@example.com
          Protocol: email
      TopicName: sns-topic
  ConfigRule1:
    Type: 'AWS::Config::ConfigRule'
    Properties:
      ConfigRuleName: root-account-mfa-enabled
      Scope:
        ComplianceResourceTypes: []
      Description: >-
        A Config rule that checks whether users of your AWS account require a
        multi-factor authentication (MFA) device to sign in with root
        credentials.
      Source:
        Owner: AWS
        SourceIdentifier: ROOT_ACCOUNT_MFA_ENABLED
      MaximumExecutionFrequency: TwentyFour_Hours
    DependsOn:
      - ConfigurationRecorder
  ConfigRule3:
    Type: 'AWS::Config::ConfigRule'
    Properties:
      ConfigRuleName: iam-root-access-key-check
      Scope:
        ComplianceResourceTypes: []
      Description: >-
        A config rule that checks whether the root user access key is available.
        The rule is COMPLIANT if the user access key does not exist.
      Source:
        Owner: AWS
        SourceIdentifier: IAM_ROOT_ACCESS_KEY_CHECK
      MaximumExecutionFrequency: TwentyFour_Hours
    DependsOn:
      - ConfigurationRecorder
  CwEvent1:
    Type: 'AWS::Events::Rule'
    Properties:
      Name: detect-config-rule-compliance-changes
      Description: >-
        A CloudWatch Event Rule that detects changes to AWS Config Rule
        compliance status and publishes change events to an SNS topic for
        notification.
      State: ENABLED
      Targets:
        - Arn:
            Ref: SnsTopic1
          Id: target-id1
      EventPattern:
        detail-type:
          - Config Rules Compliance Change
        source:
          - aws.config
  SnsTopicPolicy:
    Type: 'AWS::SNS::TopicPolicy'
    Properties:
      PolicyDocument:
        Statement:
          - Sid: __default_statement_ID
            Effect: Allow
            Principal:
              AWS: '*'
            Action:
              - 'SNS:GetTopicAttributes'
              - 'SNS:SetTopicAttributes'
              - 'SNS:AddPermission'
              - 'SNS:RemovePermission'
              - 'SNS:DeleteTopic'
              - 'SNS:Subscribe'
              - 'SNS:ListSubscriptionsByTopic'
              - 'SNS:Publish'
              - 'SNS:Receive'
            Resource:
              Ref: SnsTopic1
            Condition:
              StringEquals:
                'AWS:SourceOwner':
                  Ref: 'AWS::AccountId'
          - Sid: TrustCWEToPublishEventsToMyTopic
            Effect: Allow
            Principal:
              Service: events.amazonaws.com
            Action: 'sns:Publish'
            Resource:
              Ref: SnsTopic1
      Topics:
        - Ref: SnsTopic1
  CwAlarm1:
    Type: 'AWS::CloudWatch::Alarm'
    Properties:
      AlarmName: root_account_login
      AlarmDescription: A CloudWatch Alarm that triggers if a root user uses the account.
      MetricName: RootUserEventCount
      Namespace: CloudTrailMetrics
      Statistic: Sum
      Period: '60'
      EvaluationPeriods: '1'
      Threshold: '1'
      ComparisonOperator: GreaterThanOrEqualToThreshold
      AlarmActions:
        - Ref: SnsTopic1
      TreatMissingData: notBreaching
  MetricFilter1:
    Type: 'AWS::Logs::MetricFilter'
    Properties:
      LogGroupName:
        Ref: CWLogGroupForCloudTrail
      FilterPattern: >-
        { ($.userIdentity.type = "Root") && ($.userIdentity.invokedBy NOT
        EXISTS) && ($.eventType != "AwsServiceEvent") }
      MetricTransformations:
        - MetricValue: '1'
          MetricNamespace: CloudTrailMetrics
          MetricName: RootUserEventCount
Parameters: {}
Metadata: {}
Conditions: {}