Enabling coarse-grained access controls with IAM resource policies for data on S3
Coarse-grained access control (CGAC) is a term that does not have an industry-standard definition. Generally, in this book, when we refer to CGAC in the context of data lakes, we are referring to object-level permissions such as individual files on S3. If a user has access to an object, they can access all the data within that file. Fine-grained access control (FGAC) provides authorization on data within the files, such as columns and rows. We will discuss FGAC in more detail in the next section.
Within AWS, there is one popular way to achieve CGAC with data on S3. That is through bucket policies that limit access to IAM principals. We will look at how to enable this in this section.
CGAC through S3 bucket policies
By default, access to S3 buckets is denied unless there are policies that grant access to it. Regarding a new IAM principal, either an IAM user or role, permissions must be provided...
