Introduction

As organizations grow, managing sensitive data like database credentials, API keys, and tokens becomes more critical and challenging. AWS Secrets Manager provides a simple and secure solution for storing and retrieving sensitive information that integrates seamlessly with AWS Lambda. This article details how to integrate AWS Secrets Manager within a Python-based AWS Lambda function through the AWS Lambda Console. You will learn how to securely retrieve secrets at runtime, allowing for dynamic updates and robust security practices.

Prerequisites

Before diving into the integration, you need the following:

• An AWS account with administrative access.
• Basic understanding of AWS Lambda and IAM roles.
• Python programming experience.

Setting Up AWS Secrets Manager

Creating a Secret

1. Sign in to the AWS Management Console: Navigate to AWS Secrets Manager.
2. Store a new secret: Choose "Store a new secret."
3. Specify the secret type: You can choose the appropriate type such as "RDS credential" or "Other type of secret."
4. Enter secret details: Add key-value pairs that represent your secret data (e.g., username/password for database credentials).
5. Configure secret: Name your secret and tag it for easier management.
6. Set rotation (optional): Enable automatic rotation for managed secret types (like RDS).

IAM Permissions

Ensure your Lambda function has permissions to access AWS Secrets Manager. Attach the managed policy AWSSecretsManagerReadWrite to the Lambda execution role.

Creating a Lambda Function in Python

Step-by-step Guide

1. Open AWS Lambda Console: Navigate to AWS Lambda and choose "Create function."
2. Configure function:
   • Select "Author from scratch."
   • Provide a function name.
   • Choose Python 3.x as the runtime.
   • Use an existing role or create a new one with Secrets Manager permissions.
3. Write the function code:

• Cost: Be aware of the cost implications as AWS Secrets Manager charges for each API call to access secrets.
• Security: Regularly rotate your secrets and manage access through IAM roles.
• Environment Variables: Avoid hardcoding values by using environment variables for secret names or IDs.