How do you enable least-privilege access for AWS Lambda?

To enable least-privilege access for AWS Lambda functions, it's essential to create granular IAM policies that define the minimal permissions required for the function to operate. Instead of using broad policies like "AdministratorAccess", tailor the permissions specifically to the resources and actions needed by the Lambda function.

Example of Least-Privilege Access Policy for AWS Lambda

{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "s3:GetObject", "dynamodb:Query" ], "Resource": [ "arn:aws:s3:::example-bucket/*", "arn:aws:dynamodb:us-east-1:123456789012:table/example-table" ] } ] }

In the example above, the Lambda function is given permission to only get objects from a specific S3 bucket and query a designated DynamoDB table. This ensures that the function can perform its required actions without having unnecessary access to other services or resources.


AWS Lambda least-privilege access IAM policies AWS permissions security best practices

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