GetObjectAttributes lets a replication peer read SSE-C attributes without
presenting the customer key. That carve-out was keyed on the
X-Minio-Source-Replication-Request header alone, which any client can set,
so a caller holding only s3:GetObject could read an SSE-C object's ETag,
plaintext size, part list, and checksums without the key -- the response was
byte-identical to one made with the correct key.
Gate the carve-out on s3:ReplicateObject for the target object, mirroring
CopyObjectHandler's existing replication check.
The pre-existing test asserted the carve-out with root credentials, which
hold every action and therefore cannot tell a gated check apart from an
ungated one. Add least-privilege cases that do: a reader without
s3:ReplicateObject is now refused, a caller that holds it keeps the
carve-out, and the ordinary key-bearing path is unchanged.
Signed-off-by: Feng Ruohang <rh@vonng.com>
Feng Ruohang