Benchmark to block tenants from accessing other tenants' NFS PVs
mac-chaffee opened this issue · comments
If a cluster uses an NFS-based Container Storage Interface for persistent volumes, then a savvy user could read/write to another user's PersistentVolume if they knew the NFS server's IP and the mount path (guessable by checking the df output inside your own pod). A similar attack might be possible with certain iSCSI/block-based CSIs, but not sure.
Users can "mount" NFS servers without any special permissions/capabilities by using a user-space NFS client, so the only way to prevent this is to block network access from pods to that NFS server. One way of doing that is a Calico GlobalNetworkPolicy (see NetApp/trident#638 (comment)), but a vanilla NetworkPolicy might work too.
The benchmark could perform a test like the following:
- Install a pod with a PVC in namespace A.
- Exec into the pod in namespace A and determine the storage medium (NFS, block, or something else). If NFS, save the server hostname and mountpath into a variable.
- Install an unprivileged pod in namespace B
- Try to connect to the NFS server (maybe with
ncor something). Maybe if there's a good containerized nfs client, we could also try reading the PVC, but a ping test is probably a fine test for now.
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/lifecycle rotten
/remove-lifecycle rotten
I believe this is still a very important protection for tenants, but just haven't had the time to implement it
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/close not-planned
@k8s-triage-robot: Closing this issue, marking it as "Not Planned".
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/close not-planned
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