August 21, 2018

Encrypting NFSv4 with Stunnel TLS

NFS clients and servers push file traffic over clear-text connections in the default configuration, which is incompatible with sensitive data. TLS can wrap this traffic, finally bringing protocol security. Before you use your cloud provider's NFS tools, review all of your NFS usage and secure it where necessary.

The Network File System (NFS) is the most popular file-sharing protocol in UNIX. Decades old and predating Linux, the most modern v4 releases are easily firewalled and offer nearly everything required for seamless manipulation of remote files as if they were local.

The most obvious feature missing from NFSv4 is native, standalone encryption. Absent Kerberos, the protocol operates only in clear text, and this presents an unacceptable security risk in modern settings. NFS is hardly alone in this shortcoming, as I have already coveredĀ clear-text SMB in a previous article. Compared to SMB, NFS over stunnel offers better encryption (likely AES-GCM if used with a modern OpenSSL) on a wider array of OS versions, with no pressure in the protocol to purchase paid updates or newer OS releases.

Read more at Linux Journal

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