Hi Folks,
Are there any documented conventions regarding the security model for MetaData? Note that CloudInit allows passing user and ssh service public/private keys via MetaData service (or ConfigDrive). One assumes it must be secure, but I have not found a security model or documentation. My understanding of the Neutron reference implementation is that MetaData requests are HTTP (not HTTPS) and go from the VM to the MetaData proxy on the Network Node (after which they are proxied to Nova meta-data API server). The path from VM to Network Node using HTTP cannot guarantee confidentiality and is also susceptible to Man-in-the-Middle attacks. Some Neutron drivers proxy Metadata requests locally from the node hosting the VM that makes the query. I have mostly seen this presented/motivated as a way of removing dependency on the Network node, but it should also increase security. Yet, I have not seen explicit discussions of the security model, nor any attempt to set a standard for security of the meta-data. Finally, there do not seem to be granular controls over what meta-data is presented over ConfigDrive (when enabled) vs. meta-data REST API. As an example, Nova vendor data is presented over both, if both are enabled; config drive is presumably more secure. thanks, Pino
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