1.3.2. Shared Responsibility: Customer's Role (Developer Focus)

First Principle: The customer is responsible for "security in the cloud," securing their data, applications, and configurations within AWS services, like application code, data encryption, and IAM permissions.

In the AWS Shared Responsibility Model, the customer's responsibility is for "security in the cloud." For developers, this means securing everything they put into and configure within the AWS Cloud, specifically concerning their applications.

Key Customer Responsibilities ("Security in the Cloud") for Developers:

• Application Code Security: Writing secure code, performing code reviews, using secure libraries.
• Data Security: Encrypting application data (at rest and in transit), data classification.
• IAM Permissions: Configuring IAM roles and policies for applications using the Principle of Least Privilege.
• Network Configuration (for application traffic): Configuring Security Groups and Network ACLs for application endpoints.
• Operating System (if using EC2): Guest OS patches, security updates, firewall configurations for your application's EC2 instances.
• Configuration of Managed Services: Properly configuring security settings for services like Amazon S3 bucket policies (e.g., preventing public access unless intended), DynamoDB table access.

Scenario: When developing an application running on an EC2 instance, you are responsible for patching the guest OS, configuring its security groups to allow only necessary traffic, and writing secure application code.

Reflection Question: How does failing to implement secure coding practices or misconfiguring IAM permissions for your application directly demonstrate a failure in your responsibility for "security in the cloud" within the Shared Responsibility Model?