Co:Z SFTP

The architecture of Co:Z SFTP is designed for secure and efficient file transfer on z/OS. The main components include the SFTP server, the Co:Z SFTP client, and the z/OS dataset access module. The SFTP server is the core component, responsible for handling SFTP connections and file transfer operations.

It listens on a configurable port, typically port 22, and uses SSH for secure communication and authentication. The client is a command-line tool, `sftp`, used to initiate file transfers. The dataset access module provides the interface for interacting with z/OS datasets, including sequential and partitioned datasets.

Communication between the client and server uses the SFTP protocol over an SSH connection. The SFTP server authenticates users using the z/OS security manager (RACF, ACF2), supporting password-based and public key authentication. Data storage utilizes the z/OS file system for USS files and z/OS datasets for dataset transfers.

, port 22) through the firewall. Configuration is managed through a configuration file, specifying server settings, user access, and logging options. The logging capabilities include audit trails of file transfer activities, user logins, and errors.

The system is designed to integrate seamlessly with existing z/OS infrastructure, providing a secure and reliable file transfer solution.