Bad signature for documents shared between users with userkey encryption.

[quentinDupont]

Describe the bug
Collabora Online is not working well for documents shared between users with server configured with userkey encryption.

To Reproduce
Steps to reproduce the behavior:

1. Create a Collabora Document (like an .odt)
2. Share it with an other user
3. Both users modify the document
4. Close and reopen document (sometimes it works, sometimes not)
5. Having different errors :
   5.a) In front-end This application requires Javascript... Bad Signature
   
   5.b) In Firefox logs, some errors - not sure they are related Please do NOT wait for the DOMContentLoaded before registering your viewer handler or Content Security Policy: Les paramètres de la page ont empêché le chargement d’une ressource à eval (« script-src »).
   5.c) Docker logs

kit-01676-00034 2021-12-27 15:12:39.616180 +0000 [ kitbroker_070 ] ERR  Child session [608] not found to forward message: disconnect| kit/Kit.cpp:1482
wsd-00001-01692 2021-12-27 15:12:56.197008 +0000 [ docbroker_070 ] WRN  Waking up dead poll thread [HttpSynReqPoll], started: false, finished: false| ./net/Socket.hpp:718

Client details:

• OS: Linux
• Browser : Firefox 95 and Chromium

Server details

Operating system: Ubuntu 20.04

Web server: Nginx

Database: MariaDB

PHP version: 8.0

Nextcloud version: 23.0

Version of the richdocuments app 5.0.1

Version of Collabora Online 21.11.6

I have the same issue with Docker Collabora, CODE Integrated Server or Demo Server

I'm not sure if I have to write the issue here or on Collabora repo.

Thanks for your help :)

[juliusknorr]

Anything noticable in the Nextcloud logs when the save happens? I guess the file is also not downloadable then afterwards?

As for repairing such a file you might want to have a look at https://docs.nextcloud.com/server/latest/admin_manual/issues/general_troubleshooting.html?highlight=bad%20signature#problems-when-downloading-or-decrypting-files

What definitely also needs some check is why the bad signature message is taken as the document content then, maybe Nextcloud is either sending the wrong HTTP status or Collabora is also picking up HTML content with an error status code when fetching the file.

[rogerpfaff]

I have experienced this too with user level encryption. The command mentioned in the link only works with master key encryption so it will not fix this problem. In my case it does not seem to be related to sharing as I have two docs in the same folder and one is good and the other is "corrupted".

There is no error message in nextcloud when accessing the file.