Relationship Between a Bucket ACL and a Bucket Policy

Mapping Between Bucket ACLs and Bucket Policies

Bucket ACLs are used to control basic read and write access to buckets. Custom settings of bucket policies support more actions that can be performed on buckets. Bucket policies supplement bucket ACLs. In most cases (granting permissions to log delivery user groups excluded), you can use bucket policies to manage access to buckets. Table 1 shows the mapping between bucket ACL access permissions and bucket policy actions.

**Table 1** Mapping between bucket ACL access permissions and bucket policy actions
ACL Permission	Option	Mapped Action in a Custom Bucket Policy
Access to bucket	Read	ListBucket ListBucketVersions ListBucketMultipartUploads
Access to bucket	Write	PutObject DeleteObject DeleteObjectVersion
Access to object	Object read	GetObject
Access to ACL	Read	GetBucketAcl
Access to ACL	Write	PutBucketAcl

Mapping Relationship Between Object ACLs and Bucket Policies

Object ACLs are used to control basic read and write access permissions for objects. The custom settings of bucket policies support more actions that can be performed on objects. Table 2 describes the mapping relationship between object ACL access permissions and bucket policy actions.