Auditing with CloudTrail and S3 access logs
Auditing is an essential part of designing a secure system. Auditing provides validation that existing access policies are working and when there is a security incident, the impact of the incident and hopefully the bad actors. AWS has two native auditing mechanisms for data access that we will look at in detail: AWS CloudTrail and Amazon S3 access logs.
Auditing with AWS CloudTrail
AWS CloudTrail is a service that provides auditing capabilities for API calls that are made to all AWS services that support CloudTrail. When an AWS account is created, CloudTrail logging is enabled by default to help manage APIs. These APIs perform actions on AWS resources such as creating or describing EC2 instances, creating S3 buckets, or submitting Athena queries. The other class of events is data events. These are AWS APIs that are called on a resource itself. At the time of writing, S3 calls to list, get, put, or delete operations and Lambda invocations...
