[stable7] Ext storage share key not updated after changing applicable users

[PVince81]

Steps to reproduce

1. Enable encryption
2. Enable external storage
3. Create two users "user1" and "user2"
4. Mount a external storage as system mount point (for example "Local") and give access to "user1"
5. Create a non-empty file "test.txt" inside
6. Check the share keys inside of $datadir/files_encryption/share-keys, see that there is a key for "user1".
7. Change access of the mount point, remove "user1" and add "user2"
8. Check the keys again

Expected result

Share keys for "user1" are gone.
Share keys for "user2" exist.

Actual result

Share keys for "user1" still exist even though the user has no more access.
Share keys for "user2" are missing.

Versions

ownCloud 7 stable7 (7930440)

I talked with @schiesbn and he said there is no hook to find out whenever a mount point has changed, so it is currently not possible to detect such updates.

[PVince81]

Would be cool if the external storage users were handled just like for shares, see proposal here: #11182

[PVince81]

@MTRichards @craigpg FYI

[PVince81]

@MTRichards I moved the "enhanced proposed" to the ticket that actually makes the proposal here: #11182

Let's keep this ticket here for bugfixing, in case we find a short term solution.

CC @karlitschek

[karlitschek]

@schiesbn is this still open?

[PVince81]

Very likely to still be an issue even with 9.0 because we still don't have hooks for when applicables are changed. But hopefully with the revamped external storage code it should be much easier to add these. Setting to 9.1.

[schiessle]

That's basically the same issue as if users are added to groups... We can't magically encrypt the files for new users. One solution is the master key.

[lock]

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