Decryption corrupted all files — serious file loss

[mmaedler]

Steps to reproduce

1. Enable server-side encryption via occ encryption encrypt:all
2. Disable server-side encryption via occ encryption decrypt:all
3. All files being opened trigger "Bad Signature error in log" and seem corrupted

Expected behaviour

Files should be decrypted and accessible

Actual behaviour

Files are corrupted and cannot be opened anymore. Due to that I have lost important files.

Server configuration

Operating system: Ubuntu 16.04 server

Web server: nginx

Database: mysql

PHP version: 7.0

Nextcloud version: 12.0.4

Updated from an older Nextcloud/ownCloud or fresh install: Updated

Where did you install Nextcloud from:

Signing status:

Signing status

``` No errors have been found. ```

List of activated apps:

App list

``` Enabled: - activity: 2.5.2 - admin_audit: 1.2.0 - admin_notifications: 1.0.1 - announcementcenter: 3.1.1 - bruteforcesettings: 1.0.3 - calendar: 1.5.7 - comments: 1.2.0 - contacts: 2.0.1 - dav: 1.3.0 - encryption: 1.6.0 - external: 2.0.3 - federatedfilesharing: 1.2.0 - federation: 1.2.0 - files: 1.7.2 - files_accesscontrol: 1.2.5 - files_automatedtagging: 1.2.2 - files_external: 1.3.0 - files_pdfviewer: 1.1.1 - files_sharing: 1.4.0 - files_texteditor: 2.4.1 - files_trashbin: 1.2.0 - files_versions: 1.5.0 - files_videoplayer: 1.1.0 - firstrunwizard: 2.1 - gallery: 17.0.0 - logreader: 2.0.0 - lookup_server_connector: 1.0.0 - nextcloud_announcements: 1.1 - notifications: 2.0.0 - oauth2: 1.0.5 - password_policy: 1.2.2 - provisioning_api: 1.2.0 - quota_warning: 1.1.1 - serverinfo: 1.2.0 - sharebymail: 1.2.0 - socialsharing_email: 1.0.3 - survey_client: 1.0.0 - systemtags: 1.2.0 - theming: 1.3.0 - twofactor_backupcodes: 1.1.1 - updatenotification: 1.2.0 - workflowengine: 1.2.0 ```

Nextcloud configuration:

Config report

``` { "system": { "instanceid": "occ76c8edd49", "passwordsalt": "***REMOVED SENSITIVE VALUE***", "datadirectory": "\/var\/www\/nextcloud\/data", "dbtype": "mysql", "version": "12.0.4.3", "dbname": "owncloud", "dbhost": "127.0.0.1", "dbtableprefix": "oc_", "dbuser": "***REMOVED SENSITIVE VALUE***", "dbpassword": "***REMOVED SENSITIVE VALUE***", "installed": true, "loglevel": 3, "logtimezone": "Europe\/Berlin", "maintenance": false, "theme": "", "appstoreenabled": true, "appstoreurl": "https:\/\/apps.nextcloud.com\/api\/v0", "trusted_domains": [ "oc.betaserv.net" ], "mail_smtpmode": "php", "mail_smtpsecure": "ssl", "secret": "***REMOVED SENSITIVE VALUE***", "forcessl": true, "memcache.local": "\\OC\\Memcache\\APCu", "memcache.locking": "\\OC\\Memcache\\Redis", "redis": { "host": "\/run\/redis\/redis.sock", "port": 0, "dbindex": 0, "timeout": 1.5 }, "appstore.experimental.enabled": true, "trashbin_retention_obligation": "auto", "updater.release.channel": "stable", "mail_from_address": "Nextcloud", "mail_domain": "", "mail_smtpauthtype": "LOGIN", "mail_smtpauth": 1, "mail_smtphost": "", "mail_smtpport": "587", "preview-libreoffice-path": "\/lib\/libreoffice\/program\/soffice", "singleuser": true, "updatechecker": true, "updater.server.url": "https:\/\/updates.nextcloud.com\/updater_server\/", "token_auth_enforced": true, "overwrite.cli.url": "https:\/\/oc.betaserv.net" } } ```

Are you using encryption: yes and no

[AlexCloudDev]

hi, same here :(

we ran our nc instance with enabled server-side encryption since owncloud 7 times and disabled it 3 days ago via "occ encryption decrypt:all"

Currently we are on nc13, php7. User data encryption is still enabled.

After that we get "OCP\Encryption\Exceptions\GenericEncryptionException: Bad Signature" errors at every file we try to open. Files are still there but inaccessible. The "occ encryption decrypt:all" command finished without errors.

pls help thx

log:

OCP\Encryption\Exceptions\GenericEncryptionException: Bad Signature /var/www/html/apps/encryption/lib/Crypto/Crypt.php - line 465: OCA\Encryption\Crypto\Crypt->checkSignature('IbvrdqBYkdwoRjr...', '+dBH\x0E\xCA\xBD\xD4U\xC2\xAD>\x0E\xA7z...', 'c5578ba7708b5b6...') /var/www/html/apps/encryption/lib/Crypto/Encryption.php - line 380: OCA\Encryption\Crypto\Crypt->symmetricDecryptFileContent('IbvrdqBYkdwoRjr...', '+dBH\x0E\xCA\xBD\xD4U\xC2\xAD>\x0E\xA7z...', 'AES-256-CTR', 0, 0) /var/www/html/lib/private/Files/Stream/Encryption.php - line 464: OCA\Encryption\Crypto\Encryption->decrypt( sensitive parameters replaced ) /var/www/html/lib/private/Files/Stream/Encryption.php - line 295: OC\Files\Stream\Encryption->readCache() [internal function] OC\Files\Stream\Encryption->stream_read(8192) /var/www/html/3rdparty/icewind/streams/src/Wrapper.php - line 83: fread(Resource id #42, 8192) /var/www/html/3rdparty/icewind/streams/src/CallbackWrapper.php - line 91: Icewind\Streams\Wrapper->stream_read(8192) [internal function] Icewind\Streams\CallbackWrapper->stream_read(8192) /var/www/html/lib/private/Files/View.php - line 425: fread(Resource id #45, 8192) /var/www/html/lib/private/legacy/files.php - line 310: OC\Files\View->readfile('//ts3.txt') /var/www/html/lib/private/legacy/files.php - line 122: OC_Files getSingleFile(Object(OC\Files\View), '/', 'ts3.txt', Array) /var/www/html/apps/files/ajax/download.php - line 64: OC_Files get('/', 'ts3.txt', Array) /var/www/html/lib/private/Route/Route.php - line 155: require_once('/var/www/html/a...') [internal function] OC\Route\Route->OC\Route{closure}( sensitive parameters replaced ) /var/www/html/lib/private/Route/Router.php - line 297: call_user_func(Object(Closure), Array) /var/www/html/lib/base.php - line 998: OC\Route\Router->match('/apps/files/aja...') /var/www/html/index.php - line 37: OC handleRequest() {main}

[mmaedler]

Hi — is there any update regarding this topic? I really need my files back... Thanks!

[tessus]

Has anyone found a solution? Is this being investigated?

Now and then I truly believe that priorities are totally screwed up with this project. Sometimes a proper icon placement seems more important than making a basic feature work.

[blizzz]

@schiessle

[FlorianFranzen]

I am facing the same issue on nextcloud 13.0.1.

The problem seems to arises when encryption:decrypt-all is run in maintenance mode, during which the encryption module is actually disabled.

As a result, you will not be asked for the recovery password before the decryption and none of the files will be decrypted, but marked as such in the database, resulting in aforementioned error.

To reproduce the issue I just tested this with a fresh docker-based installation:

1. Enable encryption.
2. Upload a new file
3. Go to maintenance mode
4. Run decrypt-all

Result: File no longer accessible with error above (after leaving maintenance mode).

To get access to the file again after the failed decryption it was enough to set the files encrypted column in the filecache table back to 1 (i.e. update oc_filecache set encrypted = 1 where fileid = <FILE_ID> if you have the file id).

@schiessle Is there a quick way to detect these files and to fix their DB entries without having to restore backups?

[mmaedler]

Interesting find @FlorianFranzen ! Is it possible to simple change the encrypted-column back to 1 for all files (since I guess none of them is accessible at the moment) in one go?

Thanks!

[FlorianFranzen]

Disclaimer: I am not an nextcloud developer and you should have backups of all your data and database before you start messing with nextcloud's internal structure.

@mmaedler Yes, you could. The problem is just, that not all entries in the file cache are files (but dirs, etc.), whose encrypted flag should probably not be set.

I am working at a fix at the moment that avoids working on the database directly. I failed to get any help from any actual developers, but given the projects bad reputation that is not surprising at all.

It seems that even if the file is not marked encrypted in file cache, the encryption stream wrapper is called somehow (probably based on file content) but then fails because the file cache marks the file as not encrypted.

[AlexCloudDev]

Is there a way to decrypt the files via "occ encryption decrypt:all" without entering the maintenance mode to avoid the problem?

Thx for your help guys :)

[FlorianFranzen]

@AlexCloudDev Yes, some quick test seems to suggest that it is save. decrypt-all actually enables maintenance mode during the decryption, so there is no need for it anyway.

[mmaedler]

I tried what you suggested earlier and when running occ decrypt-all I get

Server side encryption not enabled. Nothing to do.

I guess this is because I ran the decrypt-all command before (and then ended up with this mess of files). Shall I enable encryption again?

Thanks,

Moritz

[FlorianFranzen]

@mmaedler: Just enable encryption for a brief moment, decrypt-all will disable it again anyway. Enabling encryption does only mean, that all new files added will be encrypted.

[FlorianFranzen]

@schiessle: This is quite a serious bug, that can be easily replicate in a few steps in a fresh install. Care to take a look or to at least comment on this issue?

[FlorianFranzen]

@MorrisJobke @rullzer You seem to be some sort of nextcloud maintainer. I already tried to talk to people on IRC but nobody seems to care. Would anybody care to comment on this issue?

[MorrisJobke]

cc @nextcloud/encryption

[AnianZ]

Bump to remove stale label I guess. This is still relevant and can cause serious headaches. I don't get why nothing is done about it. If there is not immediate fix at least the occ encryption decrypt:all should be deactivated while the problem persists.

[schiessle]

@AnianZ can you test it with the Nextcloud 14 beta 3? We added quite some encryption fixes to it, so chance are high that they will also resolve this issue... Thanks! https://nextcloud.com/blog/nextcloud-14-beta-3-is-here-time-for-testing-and-a-chance-to-win-a-t-shirt/

[riussi]

Thank God for this advice:

update oc_filecache set encrypted = 1

Saved me when the decrypt all did nothing but mark the files decrypted causing all files to show up as corrupt. Changed them to encrypted = 1 in the db and managed to recover them.

This is a huge problem and can cause serious loss of data.

[FlorianFranzen]

@schiessle It is an easy to reproduce bug, that has been filed with high importance with you for more than half a year and started being reported as early as at least nine month ago. You are the main encryption developer. How about you test your own code for a change?

[RubenHoms]

@FlorianFranzen I can't thank you enough for figuring this out. Your advice has literally saved 5 years worth of data. :heart:

[akalypse]

@AnianZ can you test it with the Nextcloud 14 beta 3? We added quite some encryption fixes to it, so chance are high that they will also resolve this issue... Thanks! https://nextcloud.com/blog/nextcloud-14-beta-3-is-here-time-for-testing-and-a-chance-to-win-a-t-shirt/

@schiessle : The new version changed nothing in this regards. I am still not able to decrypt my files using occ occ encryption decrypt:all

[akalypse]

Alright, after studying a bit the code, I found out that:

Precondition:

• You don't have a master key / recovery key specified

Then:

• you SHALL NOT BE in Maintenance mode
• it is obligatory to specify the User when running the decrypt:all command
• you specify the user's password when asked

Then the decryption happens and you can read your files in clear text again.

This should be documented in the latest documentation, in my opinion.

[holzfelix]

Are there solutions to fix that issue? Have lots of issues with

OCP\Encryption\Exceptions\GenericEncryptionException: Bad Signature/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/apps/encryption/lib/Crypto/Crypt.php - line 465: OCA\Encryption\Crypto\Crypt->checkSignature('XGRZuGJkEJQFB3h...', '\xA1\xFC\t\x84\x00\xA6\xBF3\xCC\x99\xAA\x87\xFFj\f...', '39c35234c03aa2f...')/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/apps/encryption/lib/Crypto/Encryption.php - line 379: OCA\Encryption\Crypto\Crypt->symmetricDecryptFileContent('XGRZuGJkEJQFB3h...', '\xA1\xFC\t\x84\x00\xA6\xBF3\xCC\x99\xAA\x87\xFFj\f...', 'AES-256-CTR', 0, 0)/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/lib/private/Files/Stream/Encryption.php - line 479: OCA\Encryption\Crypto\Encryption->decrypt(*** sensitive parameters replaced ***)/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/lib/private/Files/Stream/Encryption.php - line 299: OC\Files\Stream\Encryption->readCache()[internal function] OC\Files\Stream\Encryption->stream_read(8192)/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/3rdparty/icewind/streams/src/Wrapper.php - line 83: fread(Resource id #36, 8192)/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/3rdparty/icewind/streams/src/CallbackWrapper.php - line 91: Icewind\Streams\Wrapper->stream_read(8192)[internal function] Icewind\Streams\CallbackWrapper->stream_read(8192)/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/3rdparty/sabre/http/lib/Sapi.php - line 80: stream_copy_to_stream(Resource id #39, Resource id #41, '159972')/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 498: Sabre\HTTP\Sapi sendResponse(Object(Sabre\HTTP\Response))/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/apps/dav/lib/Server.php - line 293: Sabre\DAV\Server->exec()/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/apps/dav/appinfo/v2/remote.php - line 35: OCA\DAV\Server->exec()/var/www/nextcloud/releases/nextcloud-13.0.4/nextcloud/remote.php - line 164: require_once('/var/www/nextcl...'){main}
--

[akalypse]

@holzfelix: Yes, at least a workaround: you can disable the Signature check in the code by modifying two files:

See here: https://help.nextcloud.com/t/decrypt-my-files/30354/15

[FlorianFranzen]

@holzfelix: I would be careful. Encrypted files all start with a certain signature. If it is missing, it is very likely not an encrypted file (or it at least was corrupted somehow).

Nextcloud might wrongfully assume that a file is encrypted, if you manually set all the files in the file cache table to encrypted. Trying to decrypt files that were never encrypted in the first place will also throw this error.

It should be possible to create a file scanner that checks for this signature and available keys and then updates the encrypted status in the file cache accordingly.

[ThaDaVos]

Joining the conversation because I've got the same issue - 31 users, more than 2TB of data - followed the docs to decrypt everything - had maintenance mode on because it looked like you had to - if you followed the docs: https://docs.nextcloud.com/server/13/admin_manual/configuration_files/encryption_configuration.html

Now getting spammed with decryption errors in the logs - found a small workarround which worked in a few cases - the ones where there is only one client -> Move files out of the Nextcloud sync folder - wait 5 minutes and put them back

I also have a few users which can't be helped with this workarround so I'm trying something based on this issue:

1. Maintenance mode on
2. Make sure encryption is turned on
3. update oc_filecache set encrypted = 1
4. Maintenance mode off
5. Decrypt all using occ encryption:decrypt-all - enter master password
6. update oc_filecache set encrypted = 0

Currently at 5.

[ThaDaVos]

I'm getting [OCP\Files\StorageNotAvailableException] while trying to decrypt - can anyone help?

[jospoortvliet]

Hi all,

I'm sorry that there are issues for some of you with the encryption. Lots of improvements are made all the time but sometimes, things that could help are just not well documented or clear (like the great comment by @akalypse at https://github.com/nextcloud/server/issues/8311?fbclid=IwAR07RjhNMtK4MwbcGX6e03XclX4BIEGZ48cYn8Rt9fEWdONxWTlpd1uHiQ4#issuecomment-423243061 that I hope we can add to the docs here: https://github.com/nextcloud/documentation/pull/913).

So some of the issues you have aren't due to bugs but (sadly undocumented but) expected behavior. Please keep in mind that github is to report bugs and discuss development - the discussions about fixing systems fit better on https://help.nextcloud.com (or with our support team on https://portal.nextcloud.com).

Also keep in mind that while we (as in, paid engineers) certainly want to do our best to help everyone, our priority has to be with those who pay the bills, so we help customers first. I know that's not cool for home users or small businesses who aren't or can't afford to be customers, and we (both paid and volunteers) try to help you too - but it is best-effort.

I want to give a big thank you to the friendly people here who try to help where they can and answer questions of others or just share how they solved the problems the encountered.

[RubenHoms]

I'd like to preface this by saying that I have a lot of respect for the developers who make Nextcloud. You guys rock, keep up the good work!

Having said that I have a few issues with @jospoortvliet his comment. First, I don't think this is (mainly) a documentation issue. It would help to document this sort of unexpected behavior, but I hope you can agree with me when I say it should not be possible to let a decrypt operation leave all of your files in an unusable situation. Storing files is Nextcloud's core business, it shouldn't even be possible to trigger this scenario ever. This affects both paying and non-paying customers.

This is why I would consider this mainly as a bug. If it's not intended to have maintenance mode enabled when you're decrypting your files (and causes serious issues when you do), why not abort the operation with a descriptive message such as: "ERROR: Decryption requires maintenance mode to be disabled." Maybe even add a link to the docs how to do this. Because if this is expected behavior it would at least fix people shooting themselves in the foot.

[ThaDaVos]

I agree with @RubenHoms - such scenario should be blocked...

Now on the other hand, is there a good solution to fix this?

[hostingnuggets]

@RubenHoms if you want Nextcloud to fix things with encryption you will have to pay them or do it yourself... I discovered this the hard way myself too as I also have a few issues with encryption, see here for more details:

https://help.nextcloud.com/t/nextcloud-14-focus-on-security-and-compliance/36116/13

[ThaDaVos]

WOW!! What a shitty business model... fix/improve what we are payed for... - so if there's a huge bug which hits everyone, but everyone pays to have a new feature instead this bug won't be fixed?

It's starting to sound like OwnCloud overhere....

[RubenHoms]

@hostingnuggets & @dvdbot though I understand where you're coming from, I don't think it's unreasonable for a company to service paying customers first. The Nextcloud project would probably not be around anymore without them. I do agree though that there is a fine line between making new features and fixing existing issues (especially when they affect core business). In my opinion a fix for this issue is long due.

What I don't get with the argumentation from @jospoortvliet side though is that this somehow would not affect paying customers or this somehow does not affect Nextcloud's core business, data storage.

From the frontpage of nextlcoud.com:

Nextcloud - Protecting your data
Building self-hosted products that allow you to be productive without losing control

Be productive without losing control, great! This is why I chose to use Nextcloud in the first place. But bugs like this definitely make me lose control over my data. In fact, if it wasn't for the comments in this thread I would've lost complete control over my files as I could not decrypt them myself.

As this is a community effort I'll try and see if I can make a fix that would at least warn the users when decrypting to have maintenance mode disabled. Time to dust off my PHP chops. :joy:

[hostingnuggets]

@RubenHoms for your information I read the following quote by @tflidd, the nextcloud community leader, which explains their own position on server-side encryption:

Unfortunately, there are many open issues with server-side encryption. I generally discourage people to use this function as it has limited benefits (except on external storage) and a number of potential problems.

Source: https://help.nextcloud.com/t/nextcloud-13-breaks-users-encrypted-files/35339/6

So it is actually us, the (non-paying) users, who are the naive idiots using server-side encryption because nextcloud does not recommend to use it.

[FlorianFranzen]

@jospoortvliet I find your reply rather rude, ignorant and widely off topic. Please stop using the issue tracker as a discussion forum, especially after linking to two of them. If Nextcloud is not willing or able to contribute to fix this issue, I would welcome it if its employees could at least stay professional, instead of instigating a shit storm. "Sorry for reality."

Back to topic: As the issue is not easily getting fixed, we should at least put in a warning before more people end up with an invalid file cache as suggested. Has anybody started work on this yet?

Secondly, I think we should work on a file scanner that looks for encryption headers, available keys and decryptability to update the encrypted flag in the file cache accordingly. It seems easy enough to implement as most of the functionality already is part of nextcloud and it would be a useful tool to have to get an idea of the state of the server side encryption and associated keys of a given install.

[RubenHoms]

As the issue is not easily getting fixed, we should at least put in a warning before more people end up with an invalid file cache as suggested. Has anybody started work on this yet?

Secondly, I think we should work on a file scanner that looks for encryption headers, available keys and decryptability to update the encrypted flag in the file cache accordingly. It seems easy enough to implement as most of the functionality already is part of nextcloud and it would be a useful tool to have to get an idea of the state of the server side encryption and associated keys of a given install.

@FlorianFranzen I'm doing some initial work on returning an error when maintenance mode is enabled during decryption. That should at least make sure that nobody steps into this 'undocumented' issue anymore.

[jknockaert]

Secondly, I think we should work on a file scanner that looks for encryption headers, available keys and decryptability to update the encrypted flag in the file cache accordingly. It seems easy enough to implement as most of the functionality already is part of nextcloud and it would be a useful tool to have to get an idea of the state of the server side encryption and associated keys of a given install.

This is one of the many areas where the documentation is deficient. There is a file scanner, but good luck finding out what it does.

Whereas anyone can fix any bugs he or she wants to fix, the situation with the documentation is a bit of a catch 22. It's hard to write documentation with just the code available and guessing what it was meant to do when it was developed.

[iegtcamnp]

Hi @RubenHoms I also have nextcloud-snap so I cannot modify the Crypt.php file. I'm unable to decrypt my files after following the instructions on this thread. I was hoping you could have a look at my steps and see what I am missing. Any help would be greatly appreciated.

1. update oc_filecache set encrypted = 1 where fileid = <FILE_ID>;
2. sudo nextcloud.occ maintenance:mode --on
3. sudo nextcloud.occ encryption:enable
4. sudo nextcloud.occ encryption:decrypt-all <USER>

After running command 4 the first time, I received the message that decryption was successful. When I went to download the image from Nextcloud, it was still encrypted. So I re-did steps 1-4 and got the following error

"Files for following users couldn't be decrypted, maybe the user is not set up in a way that supports this

[RubenHoms]

@iegtcamnp I'm also running the snap and managed to decrypt my files with a workaround. You've almost got it down, you just need to skip step 2, maintenance mode needs to be disabled when you're decrypting your files. This is because while decrypting the files it checks if the encryption module is active and when the Nextcloud instance is in maintenance mode it returns false and just assumes that decryption was successful. Good luck, hope you can work it out.

[RubenHoms]

Fix has just been merged into master. :+1:

[ghost]

just to let you know. this is, in my opinion, a major bug and should be fixed as soon as possible. I am on 16.0.1.1 and have still the problem

[FlorianFranzen]

@ybaumy 16.0.1 was released before the fix was merged, so it should be included in 16.0.2.

[kesselb]

@ybaumy 16.0.1 was released before the fix was merged, so it should be included in 16.0.2.

Nextcloud 17.

[ghost]

@kesselb If this comes out in nextcloud 17 latest then do other users a favor and include some information in the documenation that decrypt-all is broken. Or point to a workaround.

[kesselb]

@ybaumy Good point :+1: Pull Requests are always welcome: https://github.com/nextcloud/documentation

[ghost]

@kesselb well I won't add it to the documentation since I won't use nextcloud much longer. the decrypt-all bug is just one of the annoyances. but I am pretty sure somebody will or not, since you pretty much do not seem to care.

[kesselb]

since you pretty much do not seem to care.

I see you're frustrated, but don't take it out on me. I'm a user like you and do contributions in my spare time :disappointed:

[ghost]

@kesselb Hey man never mind. I am beyond frustration. Dealing with badly documented OSS software and bugs for over 20 years. You spend hours or sometimes days identifying a problem and you have to wait and wait to get a fix for it. It is a completely normal behavior. Even if users lose their data or have to restore 50TB now, like in my case. Sometimes you also realize that even if you have purchased an enterprise product documentation is just at the same stage as for normal users.

[Ciangi]

Hey,

are you sure that the problem has been resolved?

After latest upgrade of nextcloud i still have some files not decrypted... I used occ enryption:decrypt-all on 16.0.1 Nextcloud version with maintenance mode enabled.

I noticed that the files, that are not decrypted, their 'path' in database is still with 'files_encyption/%' when i tried to update some 'fieldid' with enrypted=1 and then try to do occ enryption:decrypt-all, on the database record got encrypted to 0 but in nextcloud it is still encrypted...

Thanks for any help.

[RubenHoms]

Not sure what situation you're in @Ciangi , but the fix I made for this only makes it impossible to decrypt while you're in maintenance mode. Decrypting when maintenance mode is enabled made the encryption modules be unavailable which caused the corruption in this case.

If you already had files in this situation, then upgraded and tried to decrypt again it will not do anything for that. If you need to fix that situation take a look at this comment and my reply below that to fix that issue.

[yahesh]

@ybaumy @Ciangi @iegtcamnp @mmaedler @tessus I don't know if this is still relevant for you but we've written a tool that allows you to decrypt individual files if you still have your Nextcloud data directory and configuration file. It supports master key encrypted files, user key encrypted files (you additionally need the user passwords) and recovery key encrypted files (you additionally need the recovery password): decrypt-file.php