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Error files: Backends provided no user object for *** #19798

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scroom opened this issue Mar 5, 2020 · 14 comments
Closed

Error files: Backends provided no user object for *** #19798

scroom opened this issue Mar 5, 2020 · 14 comments
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0. Needs triage Pending check for reproducibility or if it fits our roadmap bug feature: ldap

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@scroom
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scroom commented Mar 5, 2020

Steps to reproduce

  1. Use Nextcloud with LDAP integration
  2. Delete an LDAP-user
  3. Delete it in Nextcloud

Expected behaviour

No errors should be shown

Actual behaviour

I get thousands of error messages which are stating, for some deleted users: Error files: Backends provided no user object for deleted user name

Server configuration

Operating system: Ubuntu 18.04

Web server: Nginx

Database: MySQL

PHP version:

Nextcloud version: 17.0.3

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

Where did you install Nextcloud from: Git

Signing status:

Signing status 
No errors have been found.

List of activated apps:

App list 
Enabled:
  - accessibility: 1.3.0
  - activity: 2.10.1
  - audioplayer: 2.9.0
  - calendar: 2.0.2
  - cloud_federation_api: 1.0.0
  - comments: 1.7.0
  - contacts: 3.2.0
  - dav: 1.13.0
  - federatedfilesharing: 1.7.0
  - federation: 1.7.0
  - files: 1.12.0
  - files_mindmap: 0.0.17
  - files_pdfviewer: 1.6.0
  - files_rightclick: 0.15.1
  - files_sharing: 1.9.0
  - files_trashbin: 1.7.0
  - files_versions: 1.10.0
  - files_videoplayer: 1.6.0
  - firstrunwizard: 2.6.0
  - gallery: 18.4.0
  - logreader: 2.2.0
  - lookup_server_connector: 1.5.0
  - nextcloud_announcements: 1.6.0
  - notes: 3.1.5
  - notifications: 2.5.0
  - oauth2: 1.5.0
  - password_policy: 1.7.0
  - polls: 1.3.0
  - privacy: 1.1.0
  - provisioning_api: 1.7.0
  - qownnotesapi: 20.1.0
  - quota_warning: 1.6.0
  - recommendations: 0.5.0
  - richdocuments: 3.5.2
  - serverinfo: 1.7.0
  - sharebymail: 1.7.0
  - support: 1.0.1
  - survey_client: 1.5.0
  - systemtags: 1.7.0
  - tasks: 0.11.3
  - text: 1.1.1
  - theming: 1.8.0
  - twofactor_backupcodes: 1.6.0
  - updatenotification: 1.7.0
  - user_ldap: 1.7.0
  - viewer: 1.2.0
  - workflowengine: 1.7.0
Disabled:
  - admin_audit
  - encryption
  - files_external
  - mail

Nextcloud configuration:

Config report 
{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "cloud.example.com"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/cloud.example.com",
        "dbtype": "mysql",
        "version": "17.0.3.1",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "memcache.local": "\\OC\\Memcache\\Redis",
        "filelocking.enabled": "true",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379,
            "timeout": 0,
            "dbindex": 0
        },
        "ldapIgnoreNamingRules": false,
        "ldapProviderFactory": "\\OCA\\User_LDAP\\LDAPProviderFactory",
        "updater.release.channel": "stable",
        "maintenance": false,
        "theme": "",
        "logfile": "\/var\/log\/nextcloud.log",
        "loglevel": 2,
        "log_rotate_size": 104857600,
        "mail_smtpmode": "smtp",
        "mail_smtpauthtype": "LOGIN",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpsecure": "tls",
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "auth.bruteforce.protection.enabled": false,
        "remember_login_cookie_lifetime": 86400,
        "session_lifetime": 14400,
        "session_keepalive": false

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

Are you using encryption: no

Are you using an external user-backend, if yes which one: LDAP

LDAP configuration (delete this part if not used)

LDAP config 
+-------------------------------+-------------------------------------------------------------------+
| Configuration                 |                                                                   |
+-------------------------------+-------------------------------------------------------------------+
| hasMemberOfFilterSupport      | 0                                                                 |
| homeFolderNamingRule          |                                                                   |
| lastJpegPhotoLookup           | 0                                                                 |
| ldapAgentName                 | cn=Admin,dc=example,dc=com                                         |
| ldapAgentPassword             | ***                                                               |
| ldapAttributesForGroupSearch  | cn                                                                |
| ldapAttributesForUserSearch   | uid;mail;cn;givenName;sn                                          |
| ldapBackupHost                |                                                                   |
| ldapBackupPort                |                                                                   |
| ldapBase                      | o=domains,dc=example,dc=com                                          |
| ldapBaseGroups                | ou=Group,domainName=example.de,o=domains,dc=example,dc=com |
| ldapBaseUsers                 | o=domains,dc=example,dc=com                                          |
| ldapCacheTTL                  | 300                                                               |
| ldapConfigurationActive       | 1                                                                 |
| ldapDefaultPPolicyDN          |                                                                   |
| ldapDynamicGroupMemberURL     |                                                                   |
| ldapEmailAttribute            | mail                                                              |
| ldapExperiencedAdmin          | 0                                                                 |
| ldapExpertUUIDGroupAttr       | cn                                                                |
| ldapExpertUUIDUserAttr        | uid                                                               |
| ldapExpertUsernameAttr        |                                                                   |
| ldapExtStorageHomeAttribute   |                                                                   |
| ldapGidNumber                 | gidNumber                                                         |
| ldapGroupDisplayName          | cn                                                                |
| ldapGroupFilter               | (|(objectclass=posixGroup))                                       |
| ldapGroupFilterGroups         |                                                                   |
| ldapGroupFilterMode           | 1                                                                 |
| ldapGroupFilterObjectclass    |                                                                   |
| ldapGroupMemberAssocAttr      | memberUid                                                         |
| ldapHost                      | localhost                                                         |
| ldapIgnoreNamingRules         |                                                                   |
| ldapLoginFilter               | (&(|(objectclass=mailUser))(|(uid=%uid)))                         |
| ldapLoginFilterAttributes     | uid                                                               |
| ldapLoginFilterEmail          | 0                                                                 |
| ldapLoginFilterMode           | 0                                                                 |
| ldapLoginFilterUsername       | 0                                                                 |
| ldapNestedGroups              | 0                                                                 |
| ldapOverrideMainServer        |                                                                   |
| ldapPagingSize                | 500                                                               |
| ldapPort                      | 389                                                               |
| ldapQuotaAttribute            |                                                                   |
| ldapQuotaDefault              |                                                                   |
| ldapTLS                       | 0                                                                 |
| ldapUserAvatarRule            | default                                                           |
| ldapUserDisplayName           | cn                                                                |
| ldapUserDisplayName2          |                                                                   |
| ldapUserFilter                | (|(objectclass=mailUser))                                         |
| ldapUserFilterGroups          |                                                                   |
| ldapUserFilterMode            | 1                                                                 |
| ldapUserFilterObjectclass     | inetOrgPerson                                                     |
| ldapUuidGroupAttribute        | auto                                                              |
| ldapUuidUserAttribute         | auto                                                              |
| turnOffCertCheck              | 0                                                                 |
| turnOnPasswordChange          | 0                                                                 |
| useMemberOfToDetectMembership | 1                                                                 |
+-------------------------------+-------------------------------------------------------------------+

Logs

Nextcloud log (data/nextcloud.log)

Nextcloud log 
{"reqId":"1WDnBimK6nOZgGtETbcL","level":3,"time":"2020-03-05T19:54:04+00:00","remoteAddr":"******","user":"user1","app":"PHP","method":"GET","url":"\/ocs\/v2.php\/core\/whatsnew?format=json","message":"Undefined index: changelogURL at \/var\/www\/nextcloud\/core\/Controller\/WhatsNewController.php#91","userAgent":"Mozilla\/5.0 (Linux; Android 10; SM-G960F) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/80.0.3987.132 Mobile Safari\/537.36","version":"17.0.3.1"}
{"reqId":"z18BNFkZ96rGt51Em92O","level":3,"time":"2020-03-05T19:54:14+00:00","remoteAddr":"*******","user":"user2","app":"files","method":"PROPFIND","url":"\/remote.php\/dav\/files\/user2\/","message":" Backends provided no user object for user3","userAgent":"Mozilla\/5.0 (Linux) mirall\/2.6.3git (Nextcloud)","version":"17.0.3.1"}
{"reqId":"apcuZK6WTS4O01SdZjN1","level":3,"time":"2020-03-05T19:54:14+00:00","remoteAddr":"*******","user":"user2","app":"files","method":"PROPFIND","url":"\/remote.php\/dav\/files\/user2\/","message":" Backends provided no user object for user3","userAgent":"Mozilla\/5.0 (X11; Ubuntu; Linux x86_64; rv:73.0) Gecko\/20100101 Firefox\/73.0","version":"17.0.3.1"}
{"reqId":"JaZYozK7wNj6H5s0dJzt","level":3,"time":"2020-03-05T19:54:44+00:00","remoteAddr":"*******","user":"user2","app":"files","method":"PROPFIND","url":"\/remote.php\/dav\/files\/user2\/","message":" Backends provided no user object for user3","userAgent":"Mozilla\/5.0 (Linux) mirall\/2.6.3git (Nextcloud)","version":"17.0.3.1"}
{"reqId":"p9Pkg5XeIEVKbCZXbMiZ","level":3,"time":"2020-03-05T19:54:46+00:00","remoteAddr":"*******","user":"user2","app":"files","method":"PROPFIND","url":"\/remote.php\/dav\/files\/user2\/","message":" Backends provided no user object for user3","userAgent":"Mozilla\/5.0 (Linux) mirall\/2.6.3git (Nextcloud)","version":"17.0.3.1"}
{"reqId":"0LguEdsZ3AeEMZz3xpGC","level":3,"time":"2020-03-05T19:55:15+00:00","remoteAddr":"*******","user":"user2","app":"files","method":"PROPFIND","url":"\/remote.php\/dav\/files\/user2\/","message":" Backends provided no user object for user3","userAgent":"Mozilla\/5.0 (Linux) mirall\/2.6.3git (Nextcloud)","version":"17.0.3.1"}
{"reqId":"QdfRKKm2GnqHve8wnTNT","level":3,"time":"2020-03-05T19:55:18+00:00","remoteAddr":"*******","user":"user2","app":"files","method":"PROPFIND","url":"\/remote.php\/dav\/files\/user2\/","message":" Backends provided no user object for user3","userAgent":"Mozilla\/5.0 (Linux) mirall\/2.6.3git (Nextcloud)","version":"17.0.3.1"}
@scroom scroom added 0. Needs triage Pending check for reproducibility or if it fits our roadmap bug labels Mar 5, 2020
@scroom
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scroom commented Mar 5, 2020

Many others seem to have the same problem: https://help.nextcloud.com/t/backends-provided-no-user-object-for-a-deleted-user/54862/2

@kesselb
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kesselb commented Mar 5, 2020

Might be related: #19647

@kesselb
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kesselb commented Mar 5, 2020

cc @nextcloud/ldap

@scroom
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scroom commented Mar 10, 2020

If you need more infos don't hesitate to ask.

@blizzz
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blizzz commented Mar 10, 2020

please checkout https://docs.nextcloud.com/server/17/admin_manual/configuration_user/user_auth_ldap_cleanup.html and please also try out upcoming maintenance release (rc2 is out right now)

@scroom
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scroom commented Mar 10, 2020

@blizzz I've done so. But the user which is filling my logs, doesn't show up in the remnants-list and if I try to delete the user with delete-user I get the response that the user doesn't exist.

@louis378

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@blizzz
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blizzz commented Mar 18, 2020

@scroom did you try to remove the user manually before?

@louis378
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@blizzz
How to remove the user manually?
Did you mean use occ user:delete cmd?

@blizzz
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blizzz commented Mar 19, 2020 •
edited
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@blizzz
How to remove the user manually?
Did you mean use occ user:delete cmd?

@louis378 I know nothing about your situation. Frankly speaking, an "The same issue too." has zero value. From your question i also suppose you have not read https://docs.nextcloud.com/server/17/admin_manual/configuration_user/user_auth_ldap_cleanup.html?

@scroom
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scroom commented Mar 19, 2020

@blizzz I wanted to delete the user but it wasn't possible to do so. I had to wait that the user showed up in the remnants-list. But this list wasn't filled.
Now after I changed from AJAX to system cron the list gets filled and I can delete the users manually which is either a lot of work or you have to write a script that does the work for you.

@louis378
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louis378 commented Mar 20, 2020 •
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@blizzz
Today my problem was solved.
I have tried using occ user: delete [user],
But it always appears "the user doesn't exist."

So I tried to delete the record from DB table share that column uid_initiator contains the user.
So far, the log has not seen this error message.

Hope this will help will.

@blizzz
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blizzz commented Mar 25, 2020

@blizzz I wanted to delete the user but it wasn't possible to do so. I had to wait that the user showed up in the remnants-list. But this list wasn't filled.
Now after I changed from AJAX to system cron the list gets filled and I can delete the users manually which is either a lot of work or you have to write a script that does the work for you.

use at own risk.

@blizzz
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blizzz commented Mar 25, 2020

So I tried to delete the record from DB table share that column uid_initiator contains the user.

Eh, don't just manipulate the DB without knowing what you're doing… There's a ton of app logic sitting on top of it.

@blizzz blizzz closed this as completed Mar 25, 2020
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@louis378 @blizzz @kesselb @scroom