aws-datadog-controltower.yaml

AWSTemplateFormatVersion: '2010-09-09'
Description: AWS Control Tower Lifecycle Events for Datadog (MPCT-yseaalnf)



# ----------------------------------------------------------------------------------------------------------
#  CloudFormation Template 1 of 1 - 
#   
#   This templates allows newly added Control Tower accounts to be managed automatically by Datadog
#                                  
#   This template provisions infrastructure in the AWS Control Tower Management account that allows creation of Datadog 
#   stack instances in Control Tower managed accounts whenever a new Control Tower managed account is added
#  
#  1- Creates a Datadog Stackset in the AWS Control Tower Management Account 
#  2- Provisions a CloudWatchEvents Rule that is triggered based on a Control Tower Lifecycle Event
#  3- Provisions a Lifecyle Lambda as a target for the CloudWatch Events Rule.
#    - The Lifecycle Lambda deploys a Datadog stack in the newly added Control Tower managed account--thus placing 
#      that account under Datadog management
#  4- Lifecycle Lambda performs a POST on the Datadog AWS Integration API  - https://docs.datadoghq.com/api/v1/aws-integration/#generate-a-new-external-id  
#     that registers the new AWS managed account in Datadog and generates an External ID in response for this managed acccount. 
#   - Obtains AWS Account ID from the CreateManagedAccount or UpdateManagedAccount event. 
#   - Uses Stack Instance Parameter Override when creating a stack instance for the managed account to override the generic External ID for the StackSet with this External ID generated by Datadog for the managed AWS account
# 
#  The infrastructure provisioned by this template in Steps 1-3 allows for a Control Tower lifecycle
#  event trigger (CreateManagedAccount) to 
#       - Trigger the Lifecyle Lambda that creates Datadog stack instance in the managed account based on the
#        Datadog stackset in the Management account
#     
##
## @author: kmmahaj@amazon.com
## 
#
# ------------------------------------------------------------...............................................

Parameters:
  DatadogTemplateURL:
    Description: >-
      Base URL for Datadog CloudFormation templates - Datadog forwarder and Datadog Integration Role templates
    Type: String
    Default: 'https://datadog-cloudformation-template.s3.amazonaws.com/aws/main.yaml'
  ExternalId:
    Description: >-
      REQUIRED. Default External ID for the Datadog role (generate at
      https://app.datadoghq.com/account/settings#integrations/amazon-web-services)
    Type: String
    AllowedPattern: .+
    Default: "11f75e0e09384e098705e9041976e4ef"
    ConstraintDescription: ExternalId is required
  DdApiKey:
    Description: >-
      REQUIRED. API key for the Datadog account (find at
      https://app.datadoghq.com/account/settings#api)
    Type: String
  DatadogApplicationKey:
    Description: >-
      REQUIRED. Application key for the Datadog account (find at
      https://app.datadoghq.com/account/settings#api)
    Type: String
  DdSite:
    Type: String
    Default: datadoghq.com
    Description: Define your Datadog Site to send data to. For the Datadog EU site, set to datadoghq.eu
    AllowedPattern: .+
    ConstraintDescription: DdSite is required
  IAMRoleName:
    Description: Customize the name of IAM role for Datadog AWS integration
    Type: String
    Default: DatadogIntegrationRole
  Permissions:
    Description: >-
      Customize the permission level for the Datadog IAM role.
      Select "Core" to only grant Datadog read-only permissions (not recommended).
    Type: String
    Default: Full
    AllowedValues:
      - Full
      - Core
  LogArchives:
    Description: >-
      S3 paths to store log archives for log rehydration. Separate multiple paths with comma,
      e.g., "my-bucket,my-bucket-with-path/path". Permissions will be automatically added to
      the Datadog integration IAM role. https://docs.datadoghq.com/logs/archives/rehydrating/?tab=awss3
    Type: String
    Default: ''
  CloudTrails:
    Description: >-
      S3 buckets for Datadog CloudTrail integration. Separate multiple buckets with comma,
      e.g., "bucket1,bucket2". Permissions will be automatically added to the Datadog integration IAM role.
      https://docs.datadoghq.com/integrations/amazon_cloudtrail/
    Type: String
    Default: ''
  DdAWSAccountId:
    Description: >-
      Datadog AWS account ID allowed to assume the integration IAM role. DO NOT CHANGE!
    Type: String
    Default: "464622532012"
  DdForwarderName:
    Type: String
    Default: DatadogForwarder
    Description: >-
      The Datadog Forwarder Lambda function name. DO NOT change when updating an existing CloudFormation stack,
      otherwise the current forwarder function will be replaced and all the triggers will be lost.



Resources:

# ---------------------------------------------------------------------------------------------------
#  
#  1- Store Parameters for the Datadog StackSet in AWS Secrets Manager
#  2- Create a Datadog StackSet in the Control Tower Management Account
#      - The Datadog StackSet is based on the Datadog main.yaml template that is provided by Datadog. 
#      - The Datadog main.yaml template provisions the Datadog Integration Role and the Datadog Forwarder
# --------------------------------------------------------------------------------------------------

  DatadogSecretString1:
    Type: AWS::SecretsManager::Secret
    Properties:
      Description: Datadog Parameters required for Datadog Pro
      Name: DatadogSecretString1
      SecretString:
        Fn::Join:
        - ''
        - - '{"ExternalId":"'
          - Ref: ExternalId
          - '","DdApiKey": "'
          - Ref: DdApiKey
          - '","DatadogApplicationKey": "'
          - Ref: DatadogApplicationKey
          - '","DdSite": "'
          - Ref: DdSite
          - '","BasePermissions": "'
          - Ref: Permissions
          - '","IAMRoleName": "'
          - Ref: IAMRoleName
          - '","LogArchives": "'
          - Ref: LogArchives
          - '","CloudTrails": "'
          - Ref: CloudTrails
          - '","DdAWSAccountId": "'
          - Ref: DdAWSAccountId
          - '","DdForwarderName": "'
          - Ref: DdForwarderName
          - '"}'
  
  CreateDatadogStackSet:
    Type: 'Custom::DatadogStackSet'
    DependsOn:
      - DatadogStackSetLambdaExecutePermission
    Properties:
      ServiceToken: !GetAtt 'DatadogStackSetLambda.Arn'
      datadogUrl: !Ref DatadogTemplateURL
      AccountId: !Ref 'AWS::AccountId'
      Region: !Ref 'AWS::Region'


  DatadogStackSetLambdaExecutePermission:
    Type: 'AWS::Lambda::Permission'
    Properties:
      Action: 'lambda:InvokeFunction'
      FunctionName: !GetAtt 'DatadogStackSetLambda.Arn'
      Principal: 'cloudformation.amazonaws.com'
      SourceAccount: !Ref 'AWS::AccountId'
   
      
  DatadogStackSetLambda:
    Type: 'AWS::Lambda::Function'
    Properties:
      Handler: index.handler
      Runtime: python3.7
      MemorySize: 256
      Role: !GetAtt 'DatadogStackSetLambdaExecutionRole.Arn'
      Timeout: 60
      Code:
        ZipFile: |
          import json
          import boto3
          import botocore
          import os
          import cfnresponse
          import logging
          import requests

          logger = logging.getLogger()
          logger.setLevel(logging.INFO)
    
          def get_secret_value(key='DatadogSecretString1'):
              secretsmanager = boto3.client('secretsmanager')
              secret_list = secretsmanager.list_secrets()['SecretList']
              output = {}
              for s in secret_list:
                  if key in s.values():
                      output = secretsmanager.get_secret_value(SecretId=key)['SecretString']
              return(output)
          
          def handler(event, context):
          
              AccountId = event['ResourceProperties']['AccountId']
              datadogUrl = event['ResourceProperties']['datadogUrl']
              Region = event['ResourceProperties']['Region']

              cList = ['CAPABILITY_IAM', 'CAPABILITY_NAMED_IAM', 'CAPABILITY_AUTO_EXPAND']
              ExecRole = 'AWSControlTowerExecution'
              AdminRoleARN = 'arn:aws:iam::' + AccountId + ':role/service-role/AWSControlTowerStackSetRole'
              logger.info('EVENT Received: {}'.format(event))
              response_data = {}
              eventType = event['RequestType']

              if eventType != 'Delete':
                  logger.info('Event = ' + event['RequestType'])
                  datadog_paramList = []
                  secretList = json.loads(get_secret_value('DatadogSecretString1'))
                  for s in secretList.keys():
                    if s != 'DatadogApplicationKey':
                      keyDict = {}
                      keyDict['ParameterKey'] = s
                      keyDict['ParameterValue'] = secretList[s]
                      datadog_paramList.append(keyDict)
                  
                  logger.info('Datadog ParamList:{}'.format(datadog_paramList))
                  cloudformation = boto3.client('cloudformation')
                  datadog_result = cloudformation.create_stack_set(StackSetName='DataDogForwarderv1', \
                                      Description = 'Integration Role and Forwarder for Datadog', \
                                      TemplateURL = datadogUrl, \
                                      Parameters = datadog_paramList, \
                                      AdministrationRoleARN = AdminRoleARN, \
                                      ExecutionRoleName = ExecRole, \
                                      Capabilities = cList )
  
                  logger.info('Datadog Stackset: {}'.format(datadog_result))
                  cfnsend(event, context, 'SUCCESS', response_data)
                  return "Success"

              else:
                  logger.info(f'Request Type is Delete; unsupported')
                  cfnsend(event, context, 'SUCCESS', response_data)
                  return event

              cfnsend(event, context, 'SUCCESS', response_data)
              return "Success"

     
          def cfnsend(event, context, responseStatus, responseData, reason=None):
              if 'ResponseURL' in event:
                  responseUrl = event['ResponseURL']
                  # Build out the response json
                  responseBody = {}
                  responseBody['Status'] = responseStatus
                  responseBody['Reason'] = reason or 'CWL Log Stream =' + context.log_stream_name
                  responseBody['PhysicalResourceId'] = context.log_stream_name
                  responseBody['StackId'] = event['StackId']
                  responseBody['RequestId'] = event['RequestId']
                  responseBody['LogicalResourceId'] = event['LogicalResourceId']
                  responseBody['Data'] = responseData
                  json_responseBody = json.dumps(responseBody)

                  logger.info(f'Response body: + {json_responseBody}')

                  headers = {
                      'content-type': '',
                      'content-length': str(len(json_responseBody))
                  }
                  # Send response back to CFN
                  try:
                      response = requests.put(responseUrl,
                                              data=json_responseBody,
                                              headers=headers)
                      logger.info(f'Status code: {response.reason}')
                  except Exception as e:
                      logger.info(f'send(..) failed executing requests.put(..):  {str(e)}')
  

  DatadogStackSetLambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Sub "DatadogStackSetLambdaExecutionRole-${AWS::Region}"
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
            Condition: {}
      Path: /
      Policies:
        - PolicyName: GetSecretValue
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              Sid: Secrets1
              Effect: Allow
              Action:
                - secretsmanager:GetSecretValue
              Resource: !Ref DatadogSecretString1
        - PolicyName: ListSecrets
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              Sid: Secrets2
              Effect: Allow
              Action:
                - secretsmanager:ListSecrets
              Resource: '*'
        - PolicyName: CloudFormation_ops
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              Sid: VisualEditor2
              Effect: Allow
              Action:
                - cloudformation:CreateStackSet
              Resource: !Join [':', ['arn:aws:cloudformation', !Ref 'AWS::Region', !Ref 'AWS::AccountId', 'stackset/DataDogForwarderv1:*']]
        - PolicyName: Pass_Role
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              Sid: VisualEditor3
              Effect: Allow
              Action:
                - iam:PassRole
              Resource: !Join [':', ['arn:aws:iam:', !Ref "AWS::AccountId", 'role/service-role/AWSControlTowerStackSetRole']]
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
        - arn:aws:iam::aws:policy/AWSOrganizationsReadOnlyAccess
        - arn:aws:iam::aws:policy/AmazonS3ReadOnlyAccess


# --------------------------------------------------------------------------------------------------
# 
#  1- Provisions a CloudWatchEvents Rule that is triggered based on a Control Tower Lifecycle Event
#  2- Provisions a Lifecyle Lambda as a target for the CloudWatch Events Rule.
# 
# --------------------------------------------------------------------------------------------------

  CaptureControlTowerLifeCycleEvents:
    DependsOn:
    - TriggerCustomizationsOnLifeCycleEvent
    Type: AWS::Events::Rule
    Properties:
      Description: Capture Control Tower LifeCycle Events and Trigger an Action
      EventPattern:
        detail:
          eventName:
          - CreateManagedAccount
          - UpdateManagedAccount
          - EnableGuardrail
          - DisableGuardrail
          - SetupLandingZone
          - UpdateLandingZone
          - RegisterOrganizationalUnit
          - DeregisterOrganizationalUnit
          eventSource:
          - controltower.amazonaws.com
        detail-type:
        - AWS Service Event via CloudTrail
        source:
        - aws.controltower
      Name: CaptureControlTowerLifeCycleEvents
      State: ENABLED
      Targets:
      - Arn: !GetAtt "TriggerCustomizationsOnLifeCycleEvent.Arn"
        Id: IDCaptureControlTowerLifeCycleEvents

  LambdaRoleToCaptureEvents:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Sub "LambdaRoleToCaptureEvents-${AWS::Region}"
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
            Condition: {}
      Path: /
      Policies:
        - PolicyName: inline-policy
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - 'cloudformation:CreateStackInstances'
                Resource: !Join [':',['arn:aws:cloudformation', !Ref 'AWS::Region', !Ref 'AWS::AccountId', 'stackset/DataDogForwarderv1:*']]
        - PolicyName: GetSecretValue
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              Sid: Secrets1
              Effect: Allow
              Action:
                - secretsmanager:GetSecretValue
              Resource: !Ref DatadogSecretString1
        - PolicyName: ListSecrets
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              Sid: Secrets2
              Effect: Allow
              Action:
                - secretsmanager:ListSecrets
              Resource: '*'
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole

  TriggerCustomizationsOnLifeCycleEvent:
    DependsOn:
    - LambdaRoleToCaptureEvents
    Type: AWS::Lambda::Function
    Properties:
      Code:
        ZipFile: |
          import json
          import os
          import boto3
          import logging
          import urllib.request

          logger = logging.getLogger()
          logger.setLevel(logging.INFO)
          stackset_list = ['DataDogForwarderv1']
          result = {"ResponseMetadata":{"HTTPStatusCode":"400"}}
          
          def get_secret_value(key='DatadogSecretString1'):
              secretsmanager = boto3.client('secretsmanager')
              secret_list = secretsmanager.list_secrets()['SecretList']
              output = {}
              for s in secret_list:
                  if key in s.values():
                      output = secretsmanager.get_secret_value(SecretId=key)['SecretString']
              return(output)

          def get_datadog_external_id(accountid):
              
              secretList = json.loads(get_secret_value('DatadogSecretString1'))
              api_key=""
              application_key=""
              role_name=""
              dd_site=""

              api_key_key='DdApiKey'
              application_key_key='DatadogApplicationKey'
              role_name_key='IAMRoleName'
              dd_site_key= 'DdSite'
              
              if api_key_key in secretList:
                  api_key = secretList[api_key_key]
              if application_key_key in secretList:
                  application_key = secretList[application_key_key]
              if role_name_key in secretList:
                  role_name = secretList[role_name_key]
              if dd_site_key in secretList:
                  dd_site = secretList[dd_site_key]
              
              account_id = accountid

              datadogPOSTUrl = 'https://app.'+ dd_site + '/api/v1/integration/aws?api_key=' + api_key + '&application_key=' + application_key 

              payload = {
                    'account_id': account_id,
                    'role_name': role_name
              }
              data_json=json.dumps(payload)
              req = urllib.request.Request(url = datadogPOSTUrl, data = bytes(data_json.encode("utf-8")), method = "POST")
              response_data = {}
              with urllib.request.urlopen(req) as resp:
                response_data = json.loads(resp.read().decode("utf-8"))
                print(response_data)
              output = response_data['external_id']
              return output

          def lambda_handler(event, context):
              masterAcct = event['account']
              eventDetails = event['detail']
              regionName = eventDetails['awsRegion']
              eventName = eventDetails['eventName']
              srvEventDetails = eventDetails['serviceEventDetails']
              if eventName == 'CreateManagedAccount' or eventName == 'UpdateManagedAccount':
                  newAccInfo = {}
                  logger.info('Event Processed Sucessfully')
                  if eventName == 'CreateManagedAccount':
                      newAccInfo = srvEventDetails['createManagedAccountStatus']
                  if eventName == 'UpdateManagedAccount':
                      newAccInfo = srvEventDetails['updateManagedAccountStatus']
                  cmdStatus = newAccInfo['state']
                  if cmdStatus == 'SUCCEEDED':
                      '''Sucessful event recieved'''
                      accId = newAccInfo['account']['accountId']
                      cloudformation = boto3.client('cloudformation')
                      for item in stackset_list:
                          try:
                              external_id = get_datadog_external_id(accountid=accId)  
                              datadog_overrideparamList = []
                              keyDict = {}
                              keyDict['ParameterKey'] = 'ExternalId'
                              keyDict['ParameterValue'] = external_id
                              datadog_overrideparamList.append(keyDict)
                              result = cloudformation.create_stack_instances(StackSetName=item, ParameterOverrides=datadog_overrideparamList,Accounts=[accId], Regions=[regionName])
                              logger.info('Processed {} Sucessfully'.format(item))
                          except Exception as e:
                              logger.error('Unable to launch in:{}, REASON: {}'.format(item, e))
                  else:
                      '''Unsucessful event recieved'''
                      logger.info('Unsucessful Event Recieved. SKIPPING :{}'.format(event))
                      return(False)
              else:
                  logger.info('Control Tower Event Captured :{}'.format(event))
      Handler: index.lambda_handler
      MemorySize: 128
      Role: !GetAtt "LambdaRoleToCaptureEvents.Arn"
      Runtime: python3.7
      Timeout: 60
      
  PermissionForEventsToInvokeLambdachk:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName: !GetAtt "TriggerCustomizationsOnLifeCycleEvent.Arn"
      Principal: events.amazonaws.com
      SourceArn: !GetAtt "CaptureControlTowerLifeCycleEvents.Arn"