OwnCloudのS3連携でAccessDeniedExceptionが出た場合の対策

ポリシーでGetBucketAclが必要です

        {
            "Action": [
                "s3:GetBucketAcl", //Required on owncloud
                "s3:ListBucket",
                "s3:GetBucketLocation"
            ],
            "Effect": "Allow",
            "Resource": ["arn:aws:s3:::your.bucket"],
            "Condition": {
                "Null": {
                    "s3:prefix": "true"
                }
            }
        }