Ensure Code Integrity for AWS Lambda Functions with Automated Code Signing Using Terraform

This article demonstrates how to implement AWS Lambda code signing using Terraform to ensure code integrity and prevent unauthorized execution of Lambda functions.

• AWS Signer creates signing profiles using SHA384-ECDSA cryptographic algorithm
• S3 bucket with versioning stores original and signed Lambda deployment packages
• Automated signing jobs process Lambda code and generate signed artifacts
• Lambda functions deployed with code signing enforcement reject unsigned code
• KMS encryption protects CloudWatch logs and SQS dead letter queues
• VPC isolation with private subnets and endpoints secures Lambda execution
• Terraform automates entire deployment pipeline for consistent security across environments
• Defense-in-depth approach combines signing, encryption, network isolation, and monitoring

This solution provides a comprehensive security framework for serverless applications by automating code signing and enforcing signature validation at runtime using infrastructure as code.