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Zhengchao An
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* feat(kms): retain historical master key versions for Vault KV2 rotation
Rotation previously had to be rejected outright because replacing the
stored material would orphan every DEK wrapped by earlier versions.
Vault KV2 now keeps each version's material in an immutable, create-only
record at {prefix}/{key_id}/versions/{N} and treats the top-level record
as the current-version pointer plus fast-path material copy:
- decrypt resolves the envelope's master_key_version to its version
record; a missing version fails closed with KeyVersionNotFound and
never falls back to the current material
- envelopes without a version (pre-versioning writers) resolve to the
baseline_version frozen at the key's first rotation, so never-rotated
keys behave exactly as before
- generate_data_key stamps the wrapping version from the same key record
snapshot that supplied the material
- rotate_key commits in check-and-set order: freeze baseline, persist
the next version's material, then switch the current pointer; any
failure leaves the current pointer untouched, and concurrent rotations
serialize on the CAS writes with monotonically unique versions
- key listings drop the versions/ directory entries and physical key
deletion purges version records before the key record
Refs rustfs/backlog#1565
* test(kms): pin rotation contracts across backends and document retention
Completes the backlog#1565 series with the cross-backend regression net
and operator documentation:
- Vault Transit: ignored integration test proving version-prefixed
historical ciphertext still decrypts after rotation, with no
RustFS-side version bookkeeping in the envelope
- Local: offline mixed-format test interleaving pre-versioning and
versioned envelopes through a rejected rotation; the existing
rotation-rejection pinning test already covers material immutability
- docs: kms-backend-security.md gains the KV2 versioned retention
model, version record retention/destruction preconditions, and the
upgrade-before-first-rotation cluster constraint
Refs rustfs/backlog#1565