Relationship Between Bucket Policies and Bucket ACLs

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 ACLs supplement bucket policies, and in many cases, can be replaced by bucket policies to manage access to buckets, except when permissions are granted to a log delivery user group. Table 1 shows the mapping between bucket ACL access permissions and bucket policy actions.

**Table 1** Mapping between bucket ACLs and bucket policies
ACL Permission	Option	Mapped Action in a Custom Bucket Policy
Access to bucket	Read	HeadBucket ListBucket ListBucketVersions ListBucketMultipartUploads
Access to bucket	Write	PutObject DeleteObject DeleteObjectVersion
Access to ACL	Read	GetBucketAcl
Access to ACL	Write	PutBucketAcl

Mapping Between Object ACLs and Bucket Policies

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