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niksis02
5616f38f0a
The posix backend stages multipart uploads and temporary files inside the bucket directory under `.sgwtmp`, but nothing stopped an object key from resolving there. A client with access to the bucket could read the parts of other clients' in-progress uploads with `GetObject`/`HeadObject`, copy them out with `CopyObject`, overwrite or delete them with `PutObject`/`DeleteObject` so the upload failed on completion with `InvalidPart`, and store data that never shows up in listings. Spellings such as `./.sgwtmp/...`, `x/../.sgwtmp/...`, a leading `/` and, on case-insensitive file systems, `.SGWTMP/...` reached the same files. Add the non-AWS `ReservedObjectKey` error (400) and return it whenever an object key resolves to `.sgwtmp` or a path inside it. The key is resolved the same way `ObjectPath` resolves it, and its first path element is compared case-insensitively. The check runs after the bucket existence check in `PutObject`, `GetObject`, `HeadObject`, `GetObjectAttributes`, `DeleteObject`, `DeleteObjects` (reported per key), `CopyObject` (source and destination), the `UploadPartCopy` source, `CreateMultipartUpload`, `CompleteMultipartUpload`, object tagging, legal hold and retention. The exported `ValidateObjectKey` covers the ScoutFS `GetObject` and `RestoreObject` entry points. `UploadPart`, `ListParts` and `AbortMultipartUpload` only hash the key and stay unchanged, so uploads created with a reserved key before this fix can still be aborted. `ListObjects` and `ListObjectsV2` also listed the staged parts when the prefix named a directory inside `.sgwtmp`, because the prefix fast path in `quickWalk` compared only the last element of the prefix directory against the skipped directories. `inSkipDir` now checks every element, ignoring case.