Serverless function without tags

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Metadata

Id: cloudformation-aws-serverless-function-without-tags

Provider: AWS

Platform: CloudFormation

Severity: Low

Category: Insecure Configurations

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Description

AWS Serverless Application Model (AWS SAM) functions should include tags to support asset inventory and incident response. Check AWS::Serverless::Function resources and ensure the Properties.Tags map is defined and not null. Resources missing the Tags property or with Tags: null will be flagged.

Secure configuration example:

MyFunction:
  Type: AWS::Serverless::Function
  Properties:
    Handler: index.handler
    Runtime: nodejs14.x
    Tags:
      Environment: production
      Owner: devops

Compliant Code Examples

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: AWS SAM template with a simple API definition
Resources:
  Function1:
    Type: AWS::Serverless::Function
    Properties:
      PackageType: Image
      ImageUri: account-id.dkr.ecr.region.amazonaws.com/ecr-repo-name:image-name
      ImageConfig:
        Command:
          - "app.lambda_handler"
        EntryPoint:
          - "entrypoint1"
        WorkingDirectory: "workDir"
      Tags:
        - Key: Type
          Value: AWS Serverless Function

Non-Compliant Code Examples

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: AWS SAM template with a simple API definition
Resources:
  Function:
    Type: AWS::Serverless::Function
    Properties:
      PackageType: Image
      ImageUri: account-id.dkr.ecr.region.amazonaws.com/ecr-repo-name:image-name
      ImageConfig:
        Command:
          - "app.lambda_handler"
        EntryPoint:
          - "entrypoint1"
        WorkingDirectory: "workDir"