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Chris LuandGitHub
37f3dff677
* volume: validate the file extension in CopyFile and ReceiveFile
CopyFile and ReceiveFile build an on-disk path from the client-supplied
Ext. Both are intentionally ungated for cluster-internal peers, so a
value like "/../../x" is joined onto the volume directory and, once
path-cleaned, resolves outside it -- an EC-shard receive can then write,
and CopyFile read, anywhere the process can reach.
Constrain Ext to a real suffix (a leading dot followed by alphanumerics)
before it is used to build any path, so it can no longer carry a
separator or a parent reference.
* test: use an alphanumeric missing-file extension in the copy variants
The not-found and stop-offset-zero cases used ".definitely-missing" as a
deliberately absent source. The extension is now validated, and the hyphen
makes it invalid, so switch to ".missing" -- still a nonexistent file, but a
real extension shape.
* volume: validate the collection in CopyFile and ReceiveFile
The client-supplied Collection is folded into the on-disk path as
"<collection>_<vid>" by VolumeFileName and EcShardBaseFileName, both joined
with path.Join / util.Join. A Collection carrying a separator, e.g.
"../../x", therefore path-cleans to a target outside the volume directory,
the same escape the extension check just closed. Reject a collection that is
a bare parent reference or holds a separator; ordinary names ('.', '-' and
all) still pass.