Can't upload empty file when encryption app is enabled

[LEDfan]

Steps to reproduce

1. create empty file (e.g. touch emptyfile)
2. upload the empty file using web or client

Expected behaviour

The file should be uploaded fine.

Actual behaviour

The file isn't uploaded (error 500) and an error is reported.

Server configuration

Operating system: Centos 7.6

Web server: Apache/2.4.6

Database: mysql Ver 15.1 Distrib 5.5.60-MariaDB,

PHP version: PHP 7.3.0

Nextcloud version: 15.0.0

Updated from an older Nextcloud/ownCloud or fresh install: updated from 14 (and 15 beta/rc)

Where did you install Nextcloud from: zip file

Signing status:

Signing status

No errors have been found.

List of activated apps:

App list

Enabled:
  - accessibility: 1.1.0
  - activity: 2.8.2
  - bookmarks: 0.15.1
  - calendar: 1.6.4
  - cloud_federation_api: 0.1.0
  - comments: 1.5.0
  - contacts: 3.0.1
  - dav: 1.8.0
  - deck: 0.5.2
  - encryption: 2.3.0
  - federatedfilesharing: 1.5.0
  - federation: 1.5.0
  - files: 1.10.0
  - files_external: 1.6.0
  - files_pdfviewer: 1.4.0
  - files_sharing: 1.7.0
  - files_texteditor: 2.7.0
  - files_trashbin: 1.5.0
  - files_versions: 1.8.0
  - files_videoplayer: 1.4.0
  - gallery: 18.2.0
  - logreader: 2.0.0
  - lookup_server_connector: 1.3.0
  - mail: 0.11.0
  - news: 13.0.3
  - nextcloud_announcements: 1.4.0
  - notifications: 2.3.0
  - oauth2: 1.3.0
  - password_policy: 1.5.0
  - previewgenerator: 2.0.0
  - provisioning_api: 1.5.0
  - serverinfo: 1.5.0
  - sharebymail: 1.5.0
  - spreed: 5.0.0
  - support: 1.0.0
  - survey_client: 1.3.0
  - systemtags: 1.5.0
  - theming: 1.6.0
  - twofactor_backupcodes: 1.4.1
  - twofactor_totp: 2.1.0
  - updatenotification: 1.5.0
  - workflowengine: 1.5.0
Disabled:
  - admin_audit
  - bookmarks.bak
  - caniupdate
  - drawio
  - end_to_end_encryption
  - files_downloadactivity
  - firstrunwizard
  - user_external
  - user_ldap

Nextcloud configuration:

Config report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            ""
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "15.0.0.10",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "theme": "",
        "maintenance": false,
        "maxZipInputSize": 0,
        "allowZipDownload": true,
        "secret": "***REMOVED SENSITIVE VALUE***",
        "app.mail.server-side-cache.enabled": true,
        "trashbin_retention_obligation": "auto",
        "preview_max_scale_factor": 1,
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "htaccess.RewriteBase": "\/",
        "overwrite.cli.url": "",
        "updater.release.channel": "stable",
        "mysql.utf8mb4": true,
        "mail_smtpmode": "sendmail",
        "mail_smtpauthtype": "LOGIN",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "loglevel": 2
    }
}

**Are you using external storage, if yes which one:**No

Are you using encryption: No, but the encryption app was enabled

Logs

Web server error log

Nextcloud log (data/nextcloud.log)

Nextcloud log

[webdav] Fatal: Sabre\DAV\Exception: Error while copying file to target location (copied bytes: 0, expected filesize: 0 ) at <<closure>>

0. /var/www/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php line 156
   put(null)
1. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 1096
   createFile("emptyfile", null)
2. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php line 525
   createFile("emptyfile", null, null)
3. <<closure>>
   httpPut(Sabre\HTTP\Reque ... "}, Sabre\HTTP\Response {})
4. /var/www/nextcloud/3rdparty/sabre/event/lib/EventEmitterTrait.php line 105
   call_user_func_array([Sabre\DAV\CorePlugin {},"httpPut"], [Sabre\HTTP\Requ ... }])
5. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 479
   emit("method:PUT", [Sabre\HTTP\Requ ... }])
6. /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php line 254
   invokeMethod(Sabre\HTTP\Reque ... "}, Sabre\HTTP\Response {})
7. /var/www/nextcloud/apps/dav/appinfo/v1/webdav.php line 80
   exec()
8. /var/www/nextcloud/remote.php line 163
   require_once("/var/www/nextcl ... p")

PUT /remote.php/webdav/emptyfile
from 172.17.0.1 by admin at 2018-12-27T15:43:57+00:00


[PHP] Error: feof(): supplied resource is not a valid stream resource at /var/www/nextcloud/apps/dav/lib/Connector/Sabre/File.php#172

PUT /remote.php/webdav/emptyfile
from 172.17.0.1 by admin at 2018-12-27T15:43:57+00:00

I tried disabling all the apps I could and then re-enable them one for one. As soon as I re-enable the encryption app, the error occurs. I don't have encryption enabled though.
I tried on a fresh installation and enabling the encryption app (without configuring anything) gives the same error.

[LEDfan]

Maybe this is a duplicate of #13208 but can't tell for sure based on the description.

[pstarn]

I came here to report the exact same issue. 0 byte files can't be uploaded when the "Default encryption module" app is enabled, whether encryption is enabled on the server or not. Very easy to repro.

Ubuntu 18.04.1
NextCloud 15.0.0
PHP 7.2
mysql Ver 15.1 Distrib 10.1.34-MariaDB
nginx 1.14

Fresh install.

[r00tusrDE]

I'm getting the exact same issue when uploading empty files with the default encryption module enabled.

Debian GNU/Linux 9.6
Apache/2.4.25
PHP 7.0.33
mysql Ver 15.1 Distrib 10.1.37-MariaDB
NextCloud 15.0.0

fresh installation

[brainchild0]

I too am seeing failure messages for files belonging to any of variety of criteria, in my case preventing files from being copied to the cloud instance. One criterion is the file being empty. All empty files are failing to upload.

However, certain file patterns appear to be causing a failure for directories and nonempty files. This behavior is not the same as that for many other file patterns that are correctly ignored because they are on the ignore list. File patterns causing errors include ending in .bak, .old, .log, and .conf. There may be others, but these are the ones I have found in my files. I understand that any of these patterns are ones that some users might want to ignore, but the fact that they do not conform to ignore patterns and produce errors instead of benign messages is troubling.

I also see an issue with a file I have containing, strange as it seems, backslashes, though this case may be unrelated, since many systems would not handle such files.

To reproduce, create any empty file in any local directory being managed by Nextcloud Synchronization Client. Alternatively, create a file or directory, empty or nonempty, ending in .bak, .old, .log, or .conf. Then force a synchronization or wait until one is started automatically. The client produces an error and the file is never added to the server.

I am using server-side encryption with default settings. My installation is version 15.0 managed by Softaculous in a shared hosting service running Cloud Linux.

My desktop client is version 2.5.1 running under Ubuntu 18.10.

[MorrisJobke]

Fixed via #13468

[eehmke]

I want to support this issue. One of my users had several empty files in his directory that all were not transfered and were causing errors. In his application, he needs that files as placeholders. I was forced to disable the antivirus app.