The Ceph Object Gateway supports a subset of the Amazon S3 policy language applied to buckets.

We do not yet support setting policies on users, groups, or roles.

We use the RGW ‘tenant’ identifier in place of the Amazon twelve-digit account ID. In the future we may allow you to assign an account ID to a tenant, but for now if you want to use policies between AWS S3 and RGW S3 you will have to use the Amazon account ID as the tenant ID when creating users.

Under AWS, all tenants share a single namespace. RGW gives every tenant its own namespace of buckets. There may be an option to enable an AWS-like ‘flat’ bucket namespace in future versions. At present, to access a bucket belonging to another tenant, address it as “tenant:bucket” in the S3 request.

In AWS, a bucket policy can grant access to another account, and that account owner can then grant access to individual users with user permissions. Since we do not yet support user, role, and group permissions, account owners will currently need to grant access directly to individual users, and granting an entire account access to a bucket grants access to all users in that account.

Bucket policies do not yet support string interpolation.

For all requests, condition keys we support are: - aws:CurrentTime - aws:EpochTime - aws:PrincipalType - aws:Referer - aws:SecureTransport - aws:SourceIp - aws:UserAgent - aws:username

We support certain s3 condition keys for bucket and object requests.