B4X

SSH Authenticate with a SecureString Password and Private Key

Demonstrates the Chilkat Ssh.AuthenticateSecPwPk method, which performs the same combined password/private-key authentication as AuthenticatePwPk but receives the username and password as SecureString objects. The third argument is the 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: This is the SecureString form of multi-factor SSH authentication: the password is held encrypted in memory and combined with a private key for servers that require both. It is the most protective option when a deployment mandates two-factor SSH and you also want to minimize plaintext credential exposure in the process.

Chilkat B4X Downloads

Download Chilkat for B4X

B4X

Dim success As Boolean = False

'  Demonstrates the Ssh.AuthenticateSecPwPk method, which authenticates using SecureString login
'  and password objects together with a private key.  The 1st argument is the username, the 2nd
'  is the password, and the 3rd is an SshKey private key.

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


'  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.
Dim password As String = "mySshPassword"

'  Load the SSH private key.  LoadText reads the file's text, which is then imported.
Dim privKey As ChilkatSshKey
privKey.Initialize
Dim keyStr As String = privKey.LoadText("qa_data/id_rsa")
If privKey.LastMethodSuccess = False Then
    Log(privKey.LastErrorText)
    Return
End If

success = privKey.FromOpenSshPrivateKey(keyStr)
If success = False Then
    Log(privKey.LastErrorText)
    Return
End If


'  Place the login and password into SecureString objects.
Dim secureLogin As ChilkatSecureString
secureLogin.Initialize
secureLogin.Append("mySshLogin")
Dim securePassword As ChilkatSecureString
securePassword.Initialize
securePassword.Append(password)

success = ssh.AuthenticateSecPwPk(secureLogin, securePassword, privKey)
If success = False Then
    Log(ssh.LastErrorText)
    Return
End If

Log("Authenticated.")

ssh.Disconnect