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Cloud Storage and Cloud IAM or ACLs or Signed URLs




Cloud Storage offers layers of increasingly granular access control. For most purposes, Cloud IAM is sufficient, and roles are inherited from project to bucket to object. Access control lists (ACL) offer finer control. And for detailed control, signed URLs provide a cryptographic key that gives time-limited access to a bucket or object. A signed policy document further refines the control by determining what kind of file can be uploaded by someone with a signed URL

Cloud IAM
Works with Cloud Storage just as with using Cloud IAM with any other resource. Project Owners are automatically granted Bucket Owner role for all buckets in the project.

Note that ACLs and Cloud IAM are independent, so Project-level Cloud IAM permissions will not appear in bucket or object ACLs.

Signed URLs
A signed URL gives you the ability to grant access to a bucket without Cloud IAM user authentication for a limited period of time. e.g., when you don’t want to require users to have Google accounts.

ACLs
ACL permissions are concentric, meaning that the greater access level includes the lesser. Permission is the action that can be performed. Scope (sometimes called "grantee") is the identity that can perform the action. Applied to bucket or to object.

"Owner" is called "FULL_CONTROL" in the API. Predefined ACLs provide a convenient way to change permissions for common scenarios, for example, revoking access from everyone.

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