PowerBuilder

SSH Tunnel Authenticate with a SecureString Password

Demonstrates the Chilkat SshTunnel.AuthenticateSecPw method, which authenticates using SecureString login and password objects. The first argument is the login and the second is the password.

Background: Because a tunnel process is long-lived and holds its SSH credentials for its entire lifetime, protecting them in memory is worthwhile. A SecureString keeps the value encrypted under a randomly generated session key. Populate it from a value obtained at runtime rather than a hard-coded literal.

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integer li_rc
integer li_Success
oleobject loo_Tunnel
integer li_SshPort
string ls_Password
oleobject loo_SecureLogin
oleobject loo_SecurePassword
integer li_WaitForThreadExit

li_Success = 0

//  Demonstrates the SshTunnel.AuthenticateSecPw method, which authenticates using SecureString
//  login and password objects.  The 1st argument is the login and the 2nd is the password.

loo_Tunnel = create oleobject
li_rc = loo_Tunnel.ConnectToNewObject("Chilkat.SshTunnel")
if li_rc < 0 then
    destroy loo_Tunnel
    MessageBox("Error","Connecting to COM object failed")
    return
end if

//  The tunnel forwards accepted local connections to this destination through the SSH server.
loo_Tunnel.DestHostname = "db.internal.example.com"
loo_Tunnel.DestPort = 5432

//  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
//  does not authenticate yet.
li_SshPort = 22
li_Success = loo_Tunnel.Connect("ssh.example.com",li_SshPort)
if li_Success = 0 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    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.
ls_Password = "mySshPassword"

//  Place the login and password into SecureString objects.
loo_SecureLogin = create oleobject
li_rc = loo_SecureLogin.ConnectToNewObject("Chilkat.SecureString")

loo_SecureLogin.Append("mySshLogin")
loo_SecurePassword = create oleobject
li_rc = loo_SecurePassword.ConnectToNewObject("Chilkat.SecureString")

loo_SecurePassword.Append(ls_Password)

li_Success = loo_Tunnel.AuthenticateSecPw(loo_SecureLogin,loo_SecurePassword)
if li_Success = 0 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    destroy loo_SecureLogin
    destroy loo_SecurePassword
    return
end if

Write-Debug "Authenticated with secure strings."

//  After authenticating, call BeginAccepting to start listening for local connections to forward.

li_WaitForThreadExit = 1
li_Success = loo_Tunnel.CloseTunnel(li_WaitForThreadExit)
if li_Success = 0 then
    Write-Debug loo_Tunnel.LastErrorText
    destroy loo_Tunnel
    destroy loo_SecureLogin
    destroy loo_SecurePassword
    return
end if



destroy loo_Tunnel
destroy loo_SecureLogin
destroy loo_SecurePassword