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Implement mTLS on AWS ALB with Self-Signed Certificates
- This post covers a step-by-step guide to implementing mTLS using self-signed certificates on AWS Application Load Balancer (ALB), with instructions on how to verify the setup using cURL.
- Self-signed certificates are not typically used in production as they lack trust from external entities, but they are useful for understanding how mTLS works when a client initiates a session with a server.
- To generate necessary certificates for secure communication through mutual authentication, specific files will be used during the certificate creation process.
- Before starting, ensure that your AWS CLI is properly configured and a CloudFormation template is needed to provision the required infrastructure.
- For mutual TLS authentication, ALB requires the CA certificate chain to be stored in an S3 bucket, along with the certificate object will be referenced when the ALB's Trust Store is created.
- The final step involves verifying the mutual TLS (mTLS) handshake using cURL with the newly created ALB.
- By securing communication between clients and the ALB with mTLS, both parties authenticate each other, enhancing the security of your application.
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