Authz consistency fixes #68
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These changes make the ACL system more consistent and explainable, correcting several accumulated flaws: 1. `;metadata` reads allowed by per-version `read` ACL 2. namespace reads allowed by per-namespace `read` ACL 3. `;versions` reads allowed by per-object `read` ACL 4. object or namespace `subtree-read` ACL affects versions below 5. namespace `subtree-read` ACL affects objects below 6. namespace `subtree-read` ACL affects namespaces below
- allow `read` ACL to be stored on namespaces - fetch read and ancestor subtree-read ACLs for use in namespace logic
- load ancestor subtree-read ACLs for use in object logic
- include object subtree-{read,owner} ACLs in version read authz check
Consider these additional ACLs for read access to ;metadata - version-specific `read` ACL - ancestor namespace `subtree-read` ACL - object-level `subtree-read` ACL This aligns the ;metadata read access privileges with the object/object-version GET/HEAD privileges where the same metadata is returned in response headers already.
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