Lua

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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Lua

local chilkat = require("chilkat")

-- 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".

local ssh = chilkat.Ssh.new()

-- Connect to the SSH server.  Port 22 is the usual SSH port.
local sshPort = 22
local success = ssh:connect("ssh.example.com", sshPort)
if not success then
    print(ssh.last_error_text)
    return
end

-- Query the advertised authentication methods.  Call after Connect, before authenticating.
local methods = ssh:get_auth_methods()
if not ssh.last_method_success then
    print(ssh.last_error_text)
    return
end

print("Server auth methods: " .. methods)

ssh:disconnect()