Case sensitive usernames when logging in with an app password via webdav

This issue is previously reported (here https://github.com/owncloud/core/issues/29708), but we are now encountering it ourselves too. The way a webdav password is generated and how it is then accepted is not always consistent. 

### Steps to reproduce
1. Create user with a uppercase character
2. Generate a App passwords (Security tab by your personal settings) with a completely lower case username and a webdav token with the normal username which contains one of more uppercase characters
3. try to login with both

### Expected behaviour
Expected behaviour should be that both accounts should work and the casing of username doesn't makes a difference.

### Actual behaviour
Depends how the webdav token is generated, how the application response;
```
tomw@M0421014 ~ % curl -u 'u3342109@exchange-example.edu:app-token-is-here' https://miskatonic.data.surfsara.nl/remote.php/nonshib-webdav
This is the WebDAV interface. It can only be accessed by WebDAV clients such as the ownCloud desktop sync client.%
tomw@M0421014 ~ % curl -u 'U3342109@exchange-example.edu:app-token-is-here' https://miskatonic.data.surfsara.nl/remote.php/nonshib-webdav
<?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">
  <s:exception>Sabre\DAV\Exception\NotAuthenticated</s:exception>
  <s:message>Username or password was incorrect, Username or password was incorrect, No 'Authorization: Bearer' header found. Either the client didn't send one, or the server is mis-configured</s:message>
</d:error>
```

```
tomw@M0421014 ~ % curl -u 'U3342109@exchange-example.edu:app-token-is-here' https://miskatonic.data.surfsara.nl/remote.php/nonshib-webdav
This is the WebDAV interface. It can only be accessed by WebDAV clients such as the ownCloud desktop sync client.%
tomw@M0421014 ~ % curl -u 'u3342109@exchange-example.edu:app-token-is-here' https://miskatonic.data.surfsara.nl/remote.php/nonshib-webdav
This is the WebDAV interface. It can only be accessed by WebDAV clients such as the ownCloud desktop sync client.%
```

### Server configuration
**Operating system**:
CentOS Linux release 7.9.2009 (Core)

**Web server:**
Apache/2.4.6 (CentOS)

**Database:**
MariaDB 10.3

**PHP version:**
PHP 7.4.29

**ownCloud version:** 
OwnCloud 10.9.1



```
Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results into https://gist.github.com/ and puth the link here.
```


**The content of config/config.php:**

```
{
    "system": {
        "instanceid": "abcde",
        "license-key": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "miskatonic.data.surfsara.nl"
        ],
        "datadirectory": "\/var\/www\/owncloud\/data",
        "overwrite.cli.url": "https:\/\/miskatonic.data.surfsara.nl",
        "overwriteprotocol": "https",
        "forwarded_for_headers": [
            "HTTP_X_FORWARDED_FOR",
            "HTTP_FORWARDED_FOR"
        ],
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "ocredis",
            "port": 6379,
            "timeout": 0,
            "password": "***REMOVED SENSITIVE VALUE***",
            "dbindex": 0
        },
        "filelocking.enabled": true,
        "filelocking.ttl": 28800,
        "http.cookie.samesite": "None",
        "trusted_proxies": [
            "1.2.3.4"
        ],
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "dbname": "miskatonic_oc",
        "dbhost": "proxysql:6033",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "appcodechecker": false,
        "updatechecker": false,
        "enable_avatars": false,
        "enable_previews": true,
        "preview_max_x": 1024,
        "preview_max_y": 1024,
        "preview_max_filesize_image": 100,
        "enabledPreviewProviders": [
            "OC\\Preview\\PNG",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\GIF",
            "OC\\Preview\\BMP",
            "OC\\Preview\\XBitmap",
            "OC\\Preview\\TXT",
            "OC\\Preview\\MarkDown"
        ],
        "appstoreenabled": false,
        "has_internet_connection": true,
        "minimum.supported.desktop.version": "2.3.0",
        "objectstore_multibucket": {
            "class": "OCA\\ObjectStore\\S3",
            "arguments": {
                "autocreate": true,
                "bucket": "owncloud",
                "part_size": "52428800",
                "options": {
                    "use_arn_region": false,
                    "version": "2006-03-01",
                    "region": "NL",
                    "credentials": {
                        "key": "1234",
                        "secret": "abcd"
                    },
                    "endpoint": "https:\/\/proxy.swift.surfsara.nl:443",
                    "command.params": {
                        "PathStyle": true
                    }
                }
            }
        },
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "version": "10.9.1.2",
        "installed": true,
        "log_type": "owncloud",
        "logfile": "\/var\/log\/xcloud\/miskatonic.b08e414dc310.owncloud.log",
        "loglevel": "0",
        "logtimezone": "Europe\/Amsterdam",
        "log.condition": {
            "apps": [
                "cron"
            ],
            "logfile": "\/var\/log\/xcloud\/miskatonic.b08e414dc310.owncloud.cron.log"
        },
        "cron_log": true,
        "logdateformat": "d\/M\/Y:H:i:s",
        "ldapIgnoreNamingRules": false,
        "skeletondirectory": "",
        "maintenance": false,
        "cache_chunk_gc_ttl": 86400,
        "dav.chunk_base_dir": "\/tmp",
        "trashbin_retention_obligation": "30, 32",
        "versions_retention_obligation": "auto, 14",
        "activity_expire_days": "14",
        "shibboleth": {
            "loginButtonName": "Login via SURFconext"
        }
    }
}
```

**List of activated apps:**

```
Enabled:
  - activity:
    - Version: 2.6.1
    - Path: /var/www/owncloud/apps/activity
  - admin_audit:
    - Version: 2.1.3
    - Path: /var/www/owncloud/apps/admin_audit
  - comments:
    - Version: 0.3.0
    - Path: /var/www/owncloud/apps/comments
  - configreport:
    - Version: 0.2.0
    - Path: /var/www/owncloud/apps/configreport
  - customgroups:
    - Version: 0.6.2
    - Path: /var/www/owncloud/apps/customgroups
  - dav:
    - Version: 0.7.0
    - Path: /var/www/owncloud/apps/dav
  - diagnostics:
    - Version: 0.1.4
    - Path: /var/www/owncloud/apps/diagnostics
  - drawio:
    - Version: 0.9.2
    - Path: /var/www/owncloud/apps/drawio
  - enterprise_key:
    - Version: 0.3.0
    - Path: /var/www/owncloud/apps/enterprise_key
  - external4groups:
    - Version: 1.2
    - Path: /var/www/owncloud/apps/external4groups
  - federatedfilesharing:
    - Version: 0.5.0
    - Path: /var/www/owncloud/apps/federatedfilesharing
  - federation:
    - Version: 0.1.0
    - Path: /var/www/owncloud/apps/federation
  - files:
    - Version: 1.5.2
    - Path: /var/www/owncloud/apps/files
  - files_clipboard:
    - Version: 1.0.3
    - Path: /var/www/owncloud/apps/files_clipboard
  - files_external:
    - Version: 0.8.0
    - Path: /var/www/owncloud/apps/files_external
  - files_external_s3:
    - Version: 1.0.0
    - Path: /var/www/owncloud/apps/files_external_s3
  - files_markdown:
    - Version: 0.1
    - Path: /var/www/owncloud/apps/files_markdown
  - files_mediaviewer:
    - Version: 1.0.5
    - Path: /var/www/owncloud/apps/files_mediaviewer
  - files_pdfviewer:
    - Version: 1.0.1
    - Path: /var/www/owncloud/apps/files_pdfviewer
  - files_sharing:
    - Version: 0.14.0
    - Path: /var/www/owncloud/apps/files_sharing
  - files_texteditor:
    - Version: 2.4.1
    - Path: /var/www/owncloud/apps/files_texteditor
  - files_trashbin:
    - Version: 0.9.1
    - Path: /var/www/owncloud/apps/files_trashbin
  - firewall:
    - Version: 2.10.3
    - Path: /var/www/owncloud/apps/firewall
  - firstrunwizard:
    - Version: 1.2.0
    - Path: /var/www/owncloud/apps/firstrunwizard
  - impersonate:
    - Version: 0.5.0
    - Path: /var/www/owncloud/apps/impersonate
  - market:
    - Version: 0.6.2
    - Path: /var/www/owncloud/apps/market
  - music:
    - Version: 1.5.1
    - Path: /var/www/owncloud/apps/music
  - notifications:
    - Version: 0.5.4
    - Path: /var/www/owncloud/apps/notifications
  - oauth2:
    - Version: 0.5.2
    - Path: /var/www/owncloud/apps/oauth2
  - objectstore:
    - Version: 0.5.1
    - Path: /var/www/owncloud/apps/objectstore
  - onlyoffice:
    - Version: 7.3.1
    - Path: /var/www/owncloud/apps/onlyoffice
  - password_policy:
    - Version: 2.1.3
    - Path: /var/www/owncloud/apps/password_policy
  - provisioning_api:
    - Version: 0.5.0
    - Path: /var/www/owncloud/apps/provisioning_api
  - researchdrive_help:
    - Version: 1.0.0
    - Path: /var/www/owncloud/apps/researchdrive_help
  - systemtags:
    - Version: 0.3.0
    - Path: /var/www/owncloud/apps/systemtags
  - systemtags_management:
    - Version: 0.4.1
    - Path: /var/www/owncloud/apps/systemtags_management
  - templateeditor:
    - Version: 0.4.0
    - Path: /var/www/owncloud/apps/templateeditor
  - theme-miskatonic:
    - Version: 1.0.0
    - Path: /var/www/owncloud/apps/theme-miskatonic
  - twofactor_backup_codes:
    - Version: 0.1.0
    - Path: /var/www/owncloud/apps/twofactor_backup_codes
  - twofactor_totp:
    - Version: 0.7.4
    - Path: /var/www/owncloud/apps/twofactor_totp
  - updatenotification:
    - Version: 0.2.1
    - Path: /var/www/owncloud/apps/updatenotification
  - user_ldap:
    - Version: 0.16.0
    - Path: /var/www/owncloud/apps/user_ldap
  - user_shibboleth:
    - Version: 3.5.0
    - Path: /var/www/owncloud/apps/user_shibboleth
  - webdav_hooks:
    - Version: 0.0.1
    - Path: /var/www/owncloud/apps/webdav_hooks
  - windows_network_drive:
    - Version: 2.1.0
    - Path: /var/www/owncloud/apps/windows_network_drive
  - workflow:
    - Version: 0.5.3
    - Path: /var/www/owncloud/apps/workflow
```

### Logs
Nothing specials in the server logs. Header response;

```
$ curl -u 'U3342109@exchange-example.edu:app-token-is-here' https://miskatonic.data.surfsara.nl/remote.php/nonshib-webdav
HTTP/1.1 401 Unauthorized

$ curl -u 'u3342109@exchange-example.edu:app-token-is-here' https://miskatonic.data.surfsara.nl/remote.php/nonshib-webdav
HTTP/1.1 207 Multi-Status
```


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Case sensitive usernames when logging in with an app password via webdav #40119

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Case sensitive usernames when logging in with an app password via webdav #40119

Description

Steps to reproduce

Expected behaviour

Actual behaviour

Server configuration

Logs

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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