AWSTemplateFormatVersion: '2010-09-09'
Description: ''
Resources:
  CustomConfigRule:
    Type: 'AWS::Config::ConfigRule'
    Properties:
      ConfigRuleName: api_gw_restricted_ip
      Scope:
        ComplianceResourceTypes:
          - 'AWS::ApiGateway::RestApi'
      Description: A config rule that checks that non-private API GW have a resource based policy which limit their usage based on IP source
      Source:
        Owner: CUSTOM_LAMBDA
        SourceIdentifier:
          'Fn::GetAtt':
            - LambdaFunctionCustomConfigRule
            - Arn
        SourceDetails:
          - EventSource: aws.config
            MessageType: ScheduledNotification
            MaximumExecutionFrequency: TwentyFour_Hours
    DependsOn: LambdaInvokePermissionsCustomConfigRule
  LambdaInvokePermissionsCustomConfigRule:
    Type: 'AWS::Lambda::Permission'
    Properties:
      FunctionName:
        'Fn::GetAtt':
          - LambdaFunctionCustomConfigRule
          - Arn
      Action: 'lambda:InvokeFunction'
      Principal: config.amazonaws.com
  LambdaFunctionCustomConfigRule:
    Type: 'AWS::Lambda::Function'
    Properties:
      FunctionName: LambdaForapi_gw_restricted_ip
      Handler: index.lambda_handler
      Role:
        'Fn::GetAtt':
          - LambdaIamRoleCustomConfigRule
          - Arn
      Runtime: python3.9
      Code:
        S3Bucket:
          'Fn::Sub':
            - 'asecure-cloud-cf-aux-${Region}'
            - Region:
                Ref: 'AWS::Region'
        S3Key: API_GW_RESTRICTED_IP.zip
      Timeout: 300
    DependsOn: LambdaIamRoleCustomConfigRule
  LambdaIamRoleCustomConfigRule:
    Type: 'AWS::IAM::Role'
    Properties:
      RoleName: IAMRoleForapi_gw_restricted_ipwrs
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action:
              - 'sts:AssumeRole'
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/ReadOnlyAccess'
        - 'arn:aws:iam::aws:policy/service-role/AWSConfigRulesExecutionRole'
        - 'arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole'
Parameters: {}
Metadata: {}
Conditions: {}