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Chris Lu
8c55425d55
* sts: recognize issuer-scoped parent user ids
ComputeParentUser output has a fixed shape (base64url SHA-256); let
callers distinguish it from bare subject strings.
* s3tables: keep legacy owner re-anchoring off local and scoped account ids
Re-anchoring a stored bare subject under the single trusted issuer must
only apply to strings that could actually be a legacy OIDC subject. A
stored owner naming the reserved or a configured local account, or an
already issuer-scoped id, can otherwise be claimed by any caller whose
token asserts that string as sub.
* s3tables: re-anchor legacy policy principals in map and array forms
A stored bare subject can appear as {"AWS": sub} or inside a principal
list, not only as a top-level string; re-anchoring only the string form
left legacy Deny statements unable to match the caller.
* s3tables: keep built-in legacy exclusions independent of the account checker
A missing local-account predicate must not disable re-anchoring entirely:
the reserved accounts, ARN-shaped values, and scoped-id shapes are never
OIDC subjects regardless, while legacy Deny statements for plain subjects
still need to resolve so a denied caller cannot fall through to an
identity grant.
* s3tables: exercise legacy Deny against an owner grant
The previous case denied the caller regardless of whether the statement
principal matched; make the caller the owner so a missed match shows.
Cover the array Deny form alongside the AWS map.