You can configure multi-step authentication requiring, for example, the user password after successful public key authentication. You can easily setup a customizable multi-factor authentication. Multiple public keys per user are supported. Public key and password authentication.Web client interface so that end users can change their credentials, manage and share their files.Web based administration interface to easily manage users, folders and connections.REST API for users and folders management, data retention, backup, restore and real time reports of the active connections with possibility of forcibly closing a connection.Per user and per directory virtual permissions, for each exposed path you can allow or deny: directory listing, upload, overwrite, download, delete, rename, create directories, create symlinks, change owner/group/file mode.Cloud-based accounts can be restricted to a certain base path. SQLite, MySQL, PostgreSQL, CockroachDB, Bolt (key/value store in pure Go) and in-memory data providers are supported.Virtual accounts stored within a 'data provider'.Configurable custom commands and/or HTTP hooks on file upload, pre-upload, download, pre-download, delete, pre-delete, rename, mmkdir, rmdir on SSH commands and on user add, update and delete.Virtual folders can be private or shared among multiple users, for shared virtual folders you can define different quota limits for each user. So you can have, for example, an S3 user that exposes a GCS bucket (or part of it) on a specified path and an encrypted local filesystem on another one. Virtual folders are supported: a virtual folder can use any of the supported storage backends.

Support for serving local filesystem, encrypted local filesystem, S3 Compatible Object Storage, Google Cloud Storage, Azure Blob Storage or other SFTP accounts over SFTP/SCP/FTP/WebDAV.Several storage backends are supported: local filesystem, encrypted local filesystem, S3 (compatible) Object Storage, Google Cloud Storage, Azure Blob Storage, SFTP. Fully featured and highly configurable SFTP server with optional HTTP, FTP/S and WebDAV support.

Ubuntu webdav server