Architecture Overview; Ssh2 Running As Ssh Daemon (Server) - HP NonStop SSH 544701-014 Reference Manual

Architecture Overview

This section shows how the various components work together in different usage scenarios.

SSH2 Running as SSH Daemon (Server)

The following figure shows how the components of SSH2 work together to implement SSH server processes (often
referred to as a "daemon" in UNIX environments) on the NonStop system. These SSH processes provide shell, file
transfer and port forwarding access to remote SSH clients, such as OpenSSH on UNIX:
Figure 1: SSH2 running as SSH daemon
The SSH2 component accepts the incoming TCP/IP session and authenticates the remote user against the user database,
optionally verifying user passwords with the PAUTH process. Upon request it ...
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spawns an OSS shell, TACL or SFTPSERV process.
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allocates a PTY (a pseudo terminal) by communicating to an STN process acting as a PTY server.
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forwards TCP/IP or FTP connections from the remote SSH client to a local server process or vice versa.
The SSHCOM component is used to maintain the user database, allowing administrators to configure remote user's
public keys and control access rights to server functionality and the file system for file transfer.
28 • Introduction
HP NonStop SSH Reference Manual