B4X

Get the SSH Server's Authentication Methods

Demonstrates the Chilkat Ssh.GetAuthMethods method, which queries a connected but unauthenticated SSH server for the authentication methods it advertises. It takes no arguments and returns a lowercase, comma-separated list such as publickey,password,keyboard-interactive. Call it after Connect and before authenticating.

Background: Knowing what the server accepts lets a client choose the right authentication path — for example, falling back to keyboard-interactive when password auth is not offered. Note the documented connection side effect: querying methods advances the SSH authentication state, so call it at the correct point in the sequence.

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Dim success As Boolean = False

'  Demonstrates the Ssh.GetAuthMethods method, which queries a connected but unauthenticated SSH
'  server for the authentication methods it advertises.  It takes no arguments and returns a
'  lowercase, comma-separated list such as "publickey,password,keyboard-interactive".

Dim ssh As ChilkatSsh
ssh.Initialize("ssh")

'  Connect to the SSH server.  Port 22 is the usual SSH port.
Dim sshPort As Int = 22
success = ssh.Connect("ssh.example.com", sshPort)
If success = False Then
    Log(ssh.LastErrorText)
    Return
End If


'  Query the advertised authentication methods.  Call after Connect, before authenticating.
Dim methods As String = ssh.GetAuthMethods
If ssh.LastMethodSuccess = False Then
    Log(ssh.LastErrorText)
    Return
End If

Log("Server auth methods: " & methods)

ssh.Disconnect