[Bug]: Federating (sharing files to remote) fails with "File not found" for instances on the same server

gbraad commented 1 year ago

⚠️ This issue respects the following points: ⚠️

[X] This is a bug, not a question or a configuration/webserver/proxy issue.
[X] This issue is not already reported on Github (I've searched it).
[X] Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
[X] Nextcloud Server is running on 64bit capable CPU, PHP and OS.
[X] I agree to follow Nextcloud's Code of Conduct.

Bug description

I have set up two Nextcloud servers on different domains and want to share files between them. I have been able to add them to each other's trusted servers (though remain yellow). When sharing to either a remote user or group, the remote user is notified. When opening the 'share' on the remote server, the

Steps to reproduce

From Server B share a file to a remote Server A
Receive file on Server A
See error

Expected behavior

File opens

Installation method

Community Web installer on a VPS or web space

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.0

Web server

Apache (supported)

Database engine version

MySQL

Is this bug present after an update or on a fresh install?

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

[X] Default user-backend (database)
[ ] LDAP/ Active Directory
[ ] SSO - SAML
[ ] Other

Configuration report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "cloud.****REDACTED ENTRY****"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "25.0.2.3",
        "overwrite.cli.url": "https:\/\/cloud.****REDACTED ENTRY****",
        "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,
        "htaccess.RewriteBase": "\/",
        "htaccess.IgnoreFrontController": true
    }
}

List of activated Apps

Enabled:
  - activity: 2.17.0
  - bookmarks: 12.0.0
  - bruteforcesettings: 2.5.0
  - calendar: 4.2.1
  - circles: 25.0.0
  - cloud_federation_api: 1.8.0
  - contacts: 5.0.2
  - contactsinteraction: 1.6.0
  - dav: 1.24.0
  - federatedfilesharing: 1.15.0
  - federation: 1.15.0
  - files: 1.20.1
  - files_markdown: 2.3.6
  - files_mindmap: 0.0.27
  - files_pdfviewer: 2.6.0
  - files_rightclick: 1.4.0
  - files_sharing: 1.17.0
  - files_texteditor: 2.15.0
  - files_trashbin: 1.15.0
  - files_versions: 1.18.0
  - fileslibreofficeedit: 1.1.0
  - integration_onedrive: 1.1.4
  - logreader: 2.10.0
  - lookup_server_connector: 1.13.0
  - mail: 2.2.2
  - notes: 4.6.0
  - notifications: 2.13.1
  - oauth2: 1.13.0
  - oidc: 0.2.8
  - password_policy: 1.15.0
  - photos: 2.0.1
  - privacy: 1.9.0
  - provisioning_api: 1.15.0
  - recommendations: 1.4.0
  - related_resources: 1.0.3
  - settings: 1.7.0
  - sharebymail: 1.15.0
  - social: 0.5.0-beta3
  - spreed: 15.0.2
  - survey_client: 1.13.0
  - suspicious_login: 4.3.0
  - systemtags: 1.15.0
  - tasks: 0.14.5
  - text: 3.6.0
  - theming: 2.0.1
  - twofactor_backupcodes: 1.14.0
  - twofactor_totp: 7.0.0
  - updatenotification: 1.15.0
  - user_status: 1.5.0
  - viewer: 1.9.0
  - weather_status: 1.5.0
  - workflowengine: 2.7.0
Disabled:
  - admin_audit: 1.15.0
  - comments: 1.15.0
  - dashboard: 7.5.0
  - deck: 1.8.3
  - encryption
  - external: 5.0.0
  - externalportal: 1.0.2
  - files_external
  - firstrunwizard: 2.14.0
  - integration_discourse: 1.0.4
  - integration_github: 1.0.14
  - integration_gitlab: 1.0.12
  - integration_mastodon: 1.0.3
  - nextcloud_announcements: 1.14.0
  - serverinfo: 1.15.0
  - support: 1.8.0
  - user_ldap

Nextcloud Signing status

Hasn't failed

Nextcloud Logs

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Additional info

Initiated remote from Server B to Server A:

File shows up in 'shares' on Server A:

Error as shown on Server A:

Note: this issue occurs both ways. Servers are identically configured.

szaimen commented 1 year ago

Hi, do the instances have valid certificates or self-signed ones?

gbraad commented 1 year ago

valid certificates

Let's Encrypt certificates that have been issues early January.

szaimen commented 1 year ago

Okay

gbraad commented 1 year ago

Hmmmm... hold on. I see that Cloudflare is doing something sneaky. The external certificate is "CloudflareSSL".

Let me test with "Strict" settings. Not sure if I made that change

It was set to:

Full (strict)
Encrypts end-to-end, but requires a trusted CA or Cloudflare Origin CA certificate on the server

gbraad commented 1 year ago

Both ends were configured with the TLS/SSL setting for Cloudflare set to "Strict". I'll try to see what happens when this is turned off, though the certificate is valid, just assigned to "sni.cloudflaressl.com" in that case. I have just also tried with turning this off ("non-proxied") and this is acting the same.

gbraad commented 1 year ago

I set up an account on The Good Cloud and am able to federated files to and from Server A or Server B involving an account on The Good Cloud. This means it is something related to the communication between Server A and Server B.

Thry are hosted on the same server, but using different IP addresses with each their own certificate provided by Lets Encrypt.

szaimen commented 1 year ago

Does the feature work when the two Nextclouds are hosted on different servers (and not on one server)?

gbraad commented 1 year ago

I can't easily test that scenario though might try, but let's assume they would. What can be done to investigate this assumption to be true?

szaimen commented 1 year ago

I suspect some kind of internal networking issue on your server...

gbraad commented 1 year ago

Does this have a http fallback test option, like as I remember oc has?

szaimen commented 1 year ago

No idea, sry

gbraad commented 1 year ago

I added a new instance, on the same server, such as C, and this shows exactly the same behaviour.

gbraad commented 1 year ago

Can anyone explain the process, so I can verify what happens. Is the certificate verified locally?

nextcloud / server