Lianja

Get SSH Server Authentication Methods

Demonstrates getting the authentication methods advertised by an SSH server. Connect first but do not authenticate, then call GetAuthMethods, which returns a lowercase, comma-separated list such as publickey,password,keyboard-interactive.

Important: Querying the authentication methods intentionally disconnects from the server, so reconnect before authenticating.

Background: Knowing what a server accepts lets a client choose the right authentication path rather than guessing — for example, falling back to keyboard-interactive when password authentication is not offered, or failing fast with a clear message when only public-key is allowed. It is also useful diagnostically when authentication fails for reasons that are not obvious from the error text.

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llSuccess = .F.

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  Demonstrates getting the authentication methods advertised by an SSH server.

loSsh = createobject("CkSsh")

lnPort = 22

//  The server must be connected, but not yet authenticated.
llSuccess = loSsh.Connect("ssh.example.com",lnPort)
if (llSuccess = .F.) then
    ? loSsh.LastErrorText
    release loSsh
    return
endif

//  Returns a lowercase, comma-separated list, such as:
//      publickey,password,keyboard-interactive
lcAuthMethods = loSsh.GetAuthMethods()
if (loSsh.LastMethodSuccess = .F.) then
    ? loSsh.LastErrorText
    release loSsh
    return
endif

? "Authentication methods supported by this server: " + lcAuthMethods

//  IMPORTANT: Querying the authentication methods intentionally disconnects from the server.
//  Reconnect before authenticating.
llSuccess = loSsh.Connect("ssh.example.com",lnPort)
if (llSuccess = .F.) then
    ? loSsh.LastErrorText
    release loSsh
    return
endif

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
lcPassword = "mySshPassword"

llSuccess = loSsh.AuthenticatePw("mySshLogin",lcPassword)
if (llSuccess = .F.) then
    ? loSsh.LastErrorText
    release loSsh
    return
endif

? "SSH authentication successful."

loSsh.Disconnect()


release loSsh