B4X

Open an SSH Tunnel

Demonstrates Socket.SshOpenTunnel, which connects to an SSH server and initializes an SSH tunneling session, then authenticates it.

Background. An SSH tunnel lets a socket reach a destination host through an SSH server using port forwarding. The sequence is: open the tunnel, authenticate, then open forwarded channels to destinations.

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Dim success As Boolean = False

Dim socket As ChilkatSocket
socket.Initialize("socket")

'  Connect to the SSH server and initialize an SSH tunneling session.  Port 22 is conventional but
'  not required.
success = socket.SshOpenTunnel("ssh.example.com", 22)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If


'  After the tunnel is open, authenticate before opening forwarded channels.
'  The SSH password should come from a secure source rather than being hard-coded.
Dim sshPassword As String = "mySshPassword"
success = socket.SshAuthenticatePw("sshUser", sshPassword)
If success = False Then
    Log(socket.LastErrorText)
    Return
End If

Log("SSH tunnel established and authenticated.")