Lua

SSH Authenticate with Password and Private Key

Demonstrates the Chilkat Ssh.AuthenticatePwPk method, which authenticates with a server that requires both a password and a private key. The first argument is the username, the second is the password, and the third is an SshKey private key.

Note: The private-key path is relative to the application's current working directory. Supply the path to your own key file.

Background: Most servers require either a password or a public key, not both — but some high-security configurations mandate multi-factor SSH, combining something you know (the password) with something you have (the key). This method satisfies that policy in one call. As always, the password should come from a secure source rather than a literal in code.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the Ssh.AuthenticatePwPk method, which authenticates with a server that requires
-- BOTH a password and a private key.  The 1st argument is the username, the 2nd is the
-- password, and the 3rd is an SshKey private key.

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

-- 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.
local password = "mySshPassword"

-- Load the SSH private key.  LoadText reads the file's text, which is then imported.
local privKey = chilkat.SshKey.new()
local keyStr = privKey:load_text("qa_data/id_rsa")
if not privKey.last_method_success then
    print(privKey.last_error_text)
    return
end

success = privKey:from_open_ssh_private_key(keyStr)
if not success then
    print(privKey.last_error_text)
    return
end

success = ssh:authenticate_pw_pk("mySshLogin", password, privKey)
if not success then
    print(ssh.last_error_text)
    return
end

print("Authenticated with password and private key.")

ssh:disconnect()