DNSFWStack.cfn.yaml

Parameters:
  ParamS3ArtifactBucket:
    Type: String
    Description: Please enter the bucketname <String> you created that contain the zipfile of your lambda and layer
  ParamS3RpzBucket:
    Type: String
    Description: Please enter the bucketname <String> for the s3 bucket that will be used to temporarily store the list of domains that need to be filtered
  ParamFirewallDomainListName:
    Type: String
    Description: Please enter the Firewall Domain List Name <String> that will be created and kept up-to-date
Resources:
  LambdaRoleForLambdaRpz:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
      Description: Lambda-Role
      RoleName: LambdaRoleForLambdaRpz
  s3RpzBucket:
    Type: AWS::S3::Bucket
    Properties:
      AccessControl: Private
      BucketName:
        Ref: ParamS3RpzBucket
      LifecycleConfiguration:
        Rules:
          - ExpirationInDays: 1
            Id: 1 day expiration rule
            Status: Enabled
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        BlockPublicPolicy: true
        IgnorePublicAcls: true
        RestrictPublicBuckets: true
  Route53ResolverDomainList:
    Type: AWS::Route53Resolver::FirewallDomainList
    Properties:
      Name:
        Ref: ParamFirewallDomainListName
  AxiosLayer:
    Type: AWS::Lambda::LayerVersion
    Properties:
      Content:
        S3Bucket:
          Ref: ParamS3ArtifactBucket
        S3Key: node-axios-layer.zip
      LayerName: node-axios-layer
  LambdaRpz:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        S3Bucket:
          Ref: ParamS3ArtifactBucket
        S3Key: LambdaRpz.js.zip
      Role:
        Fn::GetAtt:
          - LambdaRoleForLambdaRpz
          - Arn
      Environment:
        Variables:
          s3Prefix:
            Ref: ParamS3RpzBucket
          FirewallDomainListId:
            Fn::GetAtt:
              - Route53ResolverDomainList
              - Id
          Region:
            Ref: AWS::Region
      FunctionName: LambdaRpz
      Handler: LambdaRpz.handler
      Layers:
        - Ref: AxiosLayer
      Runtime: nodejs14.x
  LambdaLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: /aws/lambda/LambdaRpz
      RetentionInDays: 30
  RpzSchedule:
    Type: AWS::Events::Rule
    Properties:
      Description: Scheduled rules to trigger lambdarpz to update dnsfirewall
      Name: RpzSchedule
      ScheduleExpression: rate(5 minutes)
      State: ENABLED
      Targets:
        - Arn:
            Fn::GetAtt:
              - LambdaRpz
              - Arn
          Id: LambdaRpz
          Input: '{"eventDetail":"Scheduled event"}'
  LambdaPermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName:
        Fn::GetAtt:
          - LambdaRpz
          - Arn
      Principal: events.amazonaws.com
      SourceArn:
        Fn::GetAtt:
          - RpzSchedule
          - Arn
  Policylambda:
    Type: AWS::IAM::Policy
    Properties:
      PolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Action:
              - logs:CreateLogGroup
              - logs:CreateLogStream
              - logs:PutLogEvents
            Resource:
              Fn::Join:
                - ""
                - - "arn:aws:logs:"
                  - Ref: AWS::Region
                  - ":"
                  - Ref: AWS::AccountId
                  - :*
          - Effect: Allow
            Action:
              - s3:PutObject
              - s3:GetObject
            Resource:
              Fn::Join:
                - ""
                - - Fn::GetAtt:
                      - s3RpzBucket
                      - Arn
                  - /*
          - Effect: Allow
            Action:
              - route53resolver:ImportFirewallDomains
            Resource:
              Fn::Join:
                - ""
                - - "arn:aws:route53resolver:"
                  - Ref: AWS::Region
                  - ":"
                  - Ref: AWS::AccountId
                  - :firewall-domain-list/
                  - Fn::GetAtt:
                      - Route53ResolverDomainList
                      - Id
      PolicyName: LambdaPolicyforRpzAutomation
      Roles:
        - Ref: LambdaRoleForLambdaRpz