iOS app cannot login into SMB external storage, unlike desktop web

Expected behaviour

SMB folder opens just as on desktop

Actual behaviour

500: Internal server error

Steps to reproduce

Add SMB external storage, and attempt to use it from iOS app. It doesn't matter, UPN suffix or not, domain specified or not, authentication method - predefined or log-in, it fails all the same

Reasoning or why should it be changed/implemented?

Guess why

iOS version

Any

App version

3.0.8

Server configuration

Debian 10 + nginx + php7.4-fpm + Nextcloud 19.0.3.1

Log:

{"reqId":"WNFEvD9exAav2qbcMiK8","level":4,"time":"2020-10-08T02:05:57+00:00","remoteAddr":"10.10.1.110","user":"B6B75047-AD44-4AE2-BFC9-E4FF46AE4C29","app":"webdav","method":"PROPFIND","url":"/remote.php/webdav/CRM/","message":{"Exception":"Icewind\\SMB\\Exception\\ForbiddenException","Message":"Invalid request for /CRM/%D0%9D%D0%BE%D0%B2%D0%B8%D0%BA%D0%BE%D0%B2%D0%B0%20%D0%9C (ForbiddenException)","Code":13,"Trace":[{"file":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php","line":66,"function":"fromMap","class":"Icewind\\SMB\\Exception\\Exception","type":"::"},{"file":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php","line":78,"function":"handleError","class":"Icewind\\SMB\\Native\\NativeState","type":"->"},{"file":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php","line":109,"function":"testResult","class":"Icewind\\SMB\\Native\\NativeState","type":"->"},{"file":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeShare.php","line":92,"function":"opendir","class":"Icewind\\SMB\\Native\\NativeState","type":"->"},{"file":"/var/cloud/apps/files_external/lib/Lib/Storage/SMB.php","line":236,"function":"dir","class":"Icewind\\SMB\\Native\\NativeShare","type":"->"},{"file":"/var/cloud/apps/files_external/lib/Lib/Storage/SMB.php","line":604,"function":"getFolderContents","class":"OCA\\Files_External\\Lib\\Storage\\SMB","type":"->"},{"file":"/var/cloud/lib/private/Files/Storage/Wrapper/PermissionsMask.php","line":158,"function":"getDirectoryContent","class":"OCA\\Files_External\\Lib\\Storage\\SMB","type":"->"},{"function":"getDirectoryContent","class":"OC\\Files\\Storage\\Wrapper\\PermissionsMask","type":"->"},{"file":"/var/cloud/lib/private/Files/Cache/Scanner.php","line":408,"function":"iterator_to_array"},{"file":"/var/cloud/lib/private/Files/Cache/Scanner.php","line":388,"function":"handleChildren","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/cloud/lib/private/Files/Cache/Scanner.php","line":340,"function":"scanChildren","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/cloud/lib/private/Files/View.php","line":1339,"function":"scan","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/cloud/lib/private/Files/View.php","line":1383,"function":"getCacheEntry","class":"OC\\Files\\View","type":"->"},{"file":"/var/cloud/apps/dav/lib/Connector/Sabre/Directory.php","line":329,"function":"getFileInfo","class":"OC\\Files\\View","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":799,"function":"getQuotaInfo","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/PropFind.php","line":96,"function":"Sabre\\DAV\\{closure}","class":"Sabre\\DAV\\CorePlugin","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":802,"function":"handle","class":"Sabre\\DAV\\PropFind","type":"->"},{"file":"/var/cloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"propFind","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1063,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":989,"function":"getPropertiesByNode","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1678,"function":"getPropertiesIteratorForPath","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1661,"function":"writeMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":363,"function":"generateMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpPropFind","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":474,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":251,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":319,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/apps/dav/appinfo/v1/webdav.php","line":82,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/remote.php","line":167,"args":["/var/cloud/apps/dav/appinfo/v1/webdav.php"],"function":"require_once"}],"File":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Exception/Exception.php","Line":30,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (iOS) Nextcloud-iOS/3.0.8","version":"19.0.3.1"}
{"reqId":"NGJoHrRZV0AKvU5NqF0V","level":4,"time":"2020-10-08T02:05:58+00:00","remoteAddr":"10.10.1.110","user":"B6B75047-AD44-4AE2-BFC9-E4FF46AE4C29","app":"webdav","method":"PROPFIND","url":"/remote.php/webdav/CRM/","message":{"Exception":"Icewind\\SMB\\Exception\\ForbiddenException","Message":"Invalid request for /CRM/%D0%9D%D0%BE%D0%B2%D0%B8%D0%BA%D0%BE%D0%B2%D0%B0%20%D0%9C (ForbiddenException)","Code":13,"Trace":[{"file":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php","line":66,"function":"fromMap","class":"Icewind\\SMB\\Exception\\Exception","type":"::"},{"file":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php","line":78,"function":"handleError","class":"Icewind\\SMB\\Native\\NativeState","type":"->"},{"file":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php","line":109,"function":"testResult","class":"Icewind\\SMB\\Native\\NativeState","type":"->"},{"file":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Native/NativeShare.php","line":92,"function":"opendir","class":"Icewind\\SMB\\Native\\NativeState","type":"->"},{"file":"/var/cloud/apps/files_external/lib/Lib/Storage/SMB.php","line":236,"function":"dir","class":"Icewind\\SMB\\Native\\NativeShare","type":"->"},{"file":"/var/cloud/apps/files_external/lib/Lib/Storage/SMB.php","line":604,"function":"getFolderContents","class":"OCA\\Files_External\\Lib\\Storage\\SMB","type":"->"},{"file":"/var/cloud/lib/private/Files/Storage/Wrapper/PermissionsMask.php","line":158,"function":"getDirectoryContent","class":"OCA\\Files_External\\Lib\\Storage\\SMB","type":"->"},{"function":"getDirectoryContent","class":"OC\\Files\\Storage\\Wrapper\\PermissionsMask","type":"->"},{"file":"/var/cloud/lib/private/Files/Cache/Scanner.php","line":408,"function":"iterator_to_array"},{"file":"/var/cloud/lib/private/Files/Cache/Scanner.php","line":388,"function":"handleChildren","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/cloud/lib/private/Files/Cache/Scanner.php","line":340,"function":"scanChildren","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/cloud/lib/private/Files/View.php","line":1339,"function":"scan","class":"OC\\Files\\Cache\\Scanner","type":"->"},{"file":"/var/cloud/lib/private/Files/View.php","line":1383,"function":"getCacheEntry","class":"OC\\Files\\View","type":"->"},{"file":"/var/cloud/apps/dav/lib/Connector/Sabre/Directory.php","line":329,"function":"getFileInfo","class":"OC\\Files\\View","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":799,"function":"getQuotaInfo","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/PropFind.php","line":96,"function":"Sabre\\DAV\\{closure}","class":"Sabre\\DAV\\CorePlugin","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":802,"function":"handle","class":"Sabre\\DAV\\PropFind","type":"->"},{"file":"/var/cloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"propFind","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1063,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":989,"function":"getPropertiesByNode","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1678,"function":"getPropertiesIteratorForPath","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1661,"function":"writeMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":363,"function":"generateMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpPropFind","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":474,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":251,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":319,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/apps/dav/appinfo/v1/webdav.php","line":82,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/cloud/remote.php","line":167,"args":["/var/cloud/apps/dav/appinfo/v1/webdav.php"],"function":"require_once"}],"File":"/var/cloud/apps/files_external/3rdparty/icewind/smb/src/Exception/Exception.php","Line":30,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (iOS) Nextcloud-iOS/3.0.8","version":"19.0.3.1"}

Begin by reproducing SMB external-storage access from the iOS app and compare it with desktop web behavior. Use the logged PROPFIND request to /remote.php/webdav/CRM/ and trace the reported ForbiddenException through apps/files_external/3rdparty/icewind/smb/src/Native/NativeState.php and apps/files_external/lib/Lib/Storage/SMB.php; done means the folder opens without a 500 error.