Fabian Morgan created HDDS-14801:
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Summary: [STS] - Part 2 IAM Session Policy and List Bucket
Improvements
Key: HDDS-14801
URL: https://issues.apache.org/jira/browse/HDDS-14801
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Fabian Morgan
Assignee: Fabian Morgan
We need to be able to tell whether an S3 STS call is authorized for listing
files in a bucket only vs being able to download a file, because those are
different actions in S3 (ListBucket vs GetObject). To differentiate, use
*LIST* at key/object level for listing permission and use *READ* at key/object
level for downloading permission. Currently, the *OmMetadataReader* authorizes
only *READ* at key level for the listing operations. In order to not break
existing functionality, have STS-specific checks that authorize against *LIST*
permission instead. Further, because of how shallow listing works, in some
cases (ex. root listing with a delimiter), it loses the context of what the
original prefix was on the S3 request. For STS authorization, we need this
original prefix, so introduce an optional listPrefix in the protocol to support
this.
Here are a quick summary of the total requisite changes:
1. Support passing list prefix on root listing so STS can authorize against it.
2. Filter out non-ListBucket actions (ex GetObject, PutObject,
ListBucketMultipartUploads, etc) when Conditions are present since we only
support s3:prefix Condition and s3:prefix is only applicable for ListBucket and
ListBucketVersions (we don't support this).
3. Keep track of the operator (i.e. StringEquals or StringLike) when using
conditions. If the operator is StringEquals and a wildcard (* or ?) is used,
ignore that condition since Ranger can’t authorize against literal asterisk or
question mark.
4. Change ListBucket to validate LIST permission on the object instead of READ
so we can determine if we should allow listing the object or downloading the
object (READ would be for downloading).
This part 2 is to change the `OmMetadataReader` to validate the LIST permission
instead of READ, but only for STS requests
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