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Labs

Implementing IAM Policies for AWS Lambda

IAM (Identity and Access Management) policies play a crucial role in AWS Lambda access control. These policies allow you to define fine-grained permissions for different AWS resources, including Lambda functions. In this lab, you will attach an IAM policy that provides an Amazon Lambda function with permission to interact with an Amazon S3 bucket.

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Lab platform
Lab Info
Level
Beginner
Last updated
Sep 21, 2025
Duration
30m

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Table of Contents
  1. Challenge

    Create a Lambda function

    Create a Lambda function using the code below. Be sure to include the S3 bucket name.

    import boto3
    
    def lambda_handler(event, context):
        # Specify the S3 bucket name
        s3_bucket = ""
    
        # Specify the new blank file key
        new_file_key = "blank_file.txt"
    
        # Initialize the S3 client
        s3_client = boto3.client('s3')
    
        # Create a blank text file content
        blank_content = ''
    
        try:
            # Put the blank text file into the specified S3 bucket
            s3_client.put_object(Body=blank_content, Bucket=s3_bucket, Key=new_file_key)
    
            print(f"Blank file created: s3://{s3_bucket}/{new_file_key}")
    
            return {
                'statusCode': 200,
                'body': 'Blank file creation complete!'
            }
    
        except Exception as e:
            print(f"Error: {str(e)}")
            return {
                'statusCode': 500,
                'body': 'Error creating blank file'
            }
    
    
    
  2. Challenge

    Add an event trigger to the Lambda function

    Add an event trigger to the Lambda function that triggers for "all new object create events" within the S3 bucket.

  3. Challenge

    Attach an IAM policy to the Lambda function

    Navigate to the IAM dashboard and attach the AmazonS3FullAccess AWS managed IAM policy to the Lambda function's role.

  4. Challenge

    Upload file object to S3 bucket

    Upload a file of your choice to the S3 bucket.

  5. Challenge

    Confirm that the S3 event triggered the Lambda function to create a file within the S3 bucket

    Confirm that the upload of a file object to the S3 bucket triggered the Lambda function to create a blank text file in the same S3 bucket.

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