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So I need to unlock an encfs directory (not home), with the user's password, when the user connects to the device via SMB.

The user has no other access - no SSH, GUI, etc. This would (almost certainly) need to be done via a server-side shell script that gets invoked by Samba, when the user logs on to Samba.

I know there may be sincere expressions of concern over security and best-practices, so just to head those off and not get sidetracked, let me say (or skip these bullets if you just want to answer the question as-asked):

  • Thank you.
  • I know this may not be "safe" standard IT client/server practice, as it could involve easily exploitable weaknesses (eg a script to hack).
  • I know that encfs is riddled with known weaknesses, and the release version is not well-maintained.
  • This is for a narrow, particular embedded use case - and a proof-of-concept at that. The gate - and only goal - here is to have Samba unlock (or trigger doing so) a transparent stacked file-based encryption, with no user intervention other than connecting with valid Samba credentials.
  • Encfs or similar per-file stacked encryption-as-normal-files is a hard requirement. Whether that's EncFS, eCryptFS, CryFS, gocryptfs - in-kernel or user-space FUSE - doesn't matter at this point. (I'm aware that eCryptFS is abandonware, and that they all have pros, cons, weaknesses - as does stacked per-file encryption in general.) It just can't be LUKS, VeraCrypt - any loopback container - ZFS, etc.

If there's also a way to capture samba disconnect or timeout event at the server-side that would also be great, but not a deal-breaker.

The server is Ubuntu 22.04 Server. The client is any SMB3-capable client.

Thanks!

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