nextcloud / nextcloud/suspicious_login

Could not deserialize persisted model

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PHP
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Description

I have a lot of following errors on NC protocol:

"Could not deserialize persisted model 254: Missing class definition for unserialized object."

Here are the raw data:
{"reqId":"tDWLs8oLa6wApE1uFe9r","level":4,"time":"2021-04-12T10:19:43+00:00","remoteAddr":"192.168.1.101","user":"sync","app":"suspicious_login","method":"REPORT","url":"/remote.php/dav/addressbooks/users/sync/gemeinsam/","message":"Could not deserialize persisted model 254: Missing class definition for unserialized object.","userAgent":"macOS/11.2.3 (20D91) AddressBookCore/2452.4","version":"21.0.1.1","id":"60741ec2b4442"}

Steps to reproduce
Expected behaviour

Contact sync is ok. I have very much denied http request regarding to contact/calendar sync. I dont know, if this have something to do with each other.

Actual behaviour

This error in nc protocol

Server configuration

**Operating system: linuxserver/nextcloud docker image

**Web server: nginx (linuxserver/nextcloud docker image)

**Database: MariaDB (linuxserver/nextcloud docker image)

**PHP version: 7.4.15

**Nextcloud version: 21.0.1

**Updated from an older Nextcloud/ownCloud or fresh install: Updated from 20.xx

**Where did you install Nextcloud from: docker image

Signing status:

Signing status 
No errors have been found.

List of activated apps:

App list 
Enabled:
  - accessibility: 1.7.0
  - activity: 2.14.3
  - admin_audit: 1.11.0
  - bruteforcesettings: 2.1.0
  - calendar: 2.2.0
  - cloud_federation_api: 1.4.0
  - contacts: 3.5.1
  - contactsinteraction: 1.2.0
  - dashboard: 7.1.0
  - dav: 1.17.1
  - federatedfilesharing: 1.11.0
  - files: 1.16.0
  - files_pdfviewer: 2.1.0
  - files_rightclick: 1.0.0
  - files_sharing: 1.13.1
  - files_trackdownloads: 1.10.0
  - files_trashbin: 1.11.0
  - files_versions: 1.14.0
  - files_videoplayer: 1.10.0
  - firstrunwizard: 2.10.0
  - forms: 2.2.4
  - logreader: 2.6.0
  - lookup_server_connector: 1.9.0
  - mail: 1.9.5
  - nextcloud_announcements: 1.10.0
  - notifications: 2.9.0
  - oauth2: 1.9.0
  - password_policy: 1.11.0
  - photos: 1.3.0
  - previewgenerator: 3.1.1
  - privacy: 1.5.0
  - provisioning_api: 1.11.0
  - recommendations: 1.0.0
  - serverinfo: 1.11.0
  - settings: 1.3.0
  - support: 1.4.0
  - suspicious_login: 4.0.0
  - systemtags: 1.11.0
  - tasks: 0.13.6
  - text: 3.2.0
  - theming: 1.12.0
  - twofactor_backupcodes: 1.10.0
  - twofactor_totp: 6.0.0
  - updatenotification: 1.11.0
  - user_status: 1.1.1
  - viewer: 1.5.0
  - weather_status: 1.1.0
  - workflowengine: 2.3.0
Disabled:
  - comments
  - encryption
  - federation
  - files_external
  - sharebymail
  - spreed
  - survey_client
  - user_ldap

Nextcloud configuration:

Config report 
{
    "system": {
        "memcache.local": "\\OC\\Memcache\\APCu",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "local_name:9443",
            "my_domain.me"
        ],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "21.0.1.1",
        "overwrite.cli.url": "https:\/\/local_name:9443",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "maintenance": false,
        "twofactor_enforced": "false",
        "twofactor_enforced_groups": [],
        "twofactor_enforced_excluded_groups": [],
        "theme": "",
        "loglevel": 0,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpsecure": "tls",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "app_install_overwrite": [
            "calendar",
            "bruteforcesettings"
        ],
        "default_phone_region": "DE"
    }
}

**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: no

Client configuration

**Browser: Brave

**Operating system: MacOS

Logs
Web server error log
Web server error log 
Insert your webserver log here
Nextcloud log (data/nextcloud.log)
Nextcloud log 
{"reqId":"9bA52GmunmHWrJpsINnX","level":4,"time":"2021-04-12T10:31:17+00:00","remoteAddr":"192.168.1.101","user":"my_second_user","app":"suspicious_login","method":"REPORT","url":"/remote.php/dav/addressbooks/users/my_second_user/gemeinsam/","message":"Could not deserialize persisted model 254: Missing class definition for unserialized object.","userAgent":"macOS/11.2.3 (20D91) AddressBookCore/2452.4","version":"21.0.1.1"}
{"reqId":"9bA52GmunmHWrJpsINnX","level":2,"time":"2021-04-12T10:31:17+00:00","remoteAddr":"192.168.1.101","user":"my_second_user","app":"suspicious_login","method":"REPORT","url":"/remote.php/dav/addressbooks/users/my_second_user/gemeinsam/","message":"Could not predict suspiciousness: Could not load model  to classify UID sync and IP 192.168.1.101: Missing class definition for unserialized object.","userAgent":"macOS/11.2.3 (20D91) AddressBookCore/2452.4","version":"21.0.1.1"}
{"reqId":"bmpsLJ0UpDOFP1Rq8qKM","level":0,"time":"2021-04-12T10:31:20+00:00","remoteAddr":"192.168.1.101","user":"my_user","app":"suspicious_login","method":"PROPFIND","url":"/remote.php/dav/files/my_user/","message":"/appinfo/app.php is deprecated, use \\OCP\\AppFramework\\Bootstrap\\IBootstrap on the application class instead.","userAgent":"Mozilla/5.0 (Macintosh) mirall/3.1.3git (build 4850) (Nextcloud)","version":"21.0.1.1"}
{"reqId":"bmpsLJ0UpDOFP1Rq8qKM","level":0,"time":"2021-04-12T10:31:20+00:00","remoteAddr":"192.168.1.101","user":"my_user","app":"contacts","method":"PROPFIND","url":"/remote.php/dav/files/my_user/","message":"/appinfo/app.php is deprecated, use \\OCP\\AppFramework\\Bootstrap\\IBootstrap on the application class instead.","userAgent":"Mozilla/5.0 (Macintosh) mirall/3.1.3git (build 4850) (Nextcloud)","version":"21.0.1.1"}
{"reqId":"bmpsLJ0UpDOFP1Rq8qKM","level":0,"time":"2021-04-12T10:31:20+00:00","remoteAddr":"192.168.1.101","user":"my_user","app":"files_sharing","method":"PROPFIND","url":"/remote.php/dav/files/my_user/","message":"/appinfo/app.php is deprecated, use \\OCP\\AppFramework\\Bootstrap\\IBootstrap on the application class instead.","userAgent":"Mozilla/5.0 (Macintosh) mirall/3.1.3git (build 4850) (Nextcloud)","version":"21.0.1.1"}

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by tracing the persisted-model deserialization path in the suspicious_login app and compare it with the supplied Nextcloud log entries for model 254. Reproduce the contact or calendar sync request if possible, then determine whether the recurring error and suspiciousness classification failure are resolved without disrupting sync.

Written by the indexing model from the issue text.

Assessment

Tech stack
php
Domain
security
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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