Visual FoxPro

SSH Tunnel Authenticate with a Password

Demonstrates the Chilkat SshTunnel.AuthenticatePw method, which authenticates the SSH connection with a login name and password. The first argument is the login and the second is the password. Connect first, and call BeginAccepting afterward.

Background: Password authentication is the simplest option, but the password is a secret and should never be a hard-coded literal — obtain it from an interactive prompt, an environment variable, or a secrets vault. Public-key authentication is generally preferred for the unattended, long-running services that tunnels often are.

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LOCAL lnSuccess
LOCAL loTunnel
LOCAL lnSshPort
LOCAL lcPassword
LOCAL lnWaitForThreadExit

lnSuccess = 0

*  Demonstrates the SshTunnel.AuthenticatePw method, which authenticates the SSH connection with
*  a login name and password.  The 1st argument is the login and the 2nd is the password.

loTunnel = CreateObject('Chilkat.SshTunnel')

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

*  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
*  does not authenticate yet.
lnSshPort = 22
lnSuccess = loTunnel.Connect("ssh.example.com",lnSshPort)
IF (lnSuccess = 0) THEN
    ? loTunnel.LastErrorText
    RELEASE loTunnel
    CANCEL
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"

lnSuccess = loTunnel.AuthenticatePw("mySshLogin",lcPassword)
IF (lnSuccess = 0) THEN
    ? loTunnel.LastErrorText
    RELEASE loTunnel
    CANCEL
ENDIF

? "Authenticated."

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

lnWaitForThreadExit = 1
lnSuccess = loTunnel.CloseTunnel(lnWaitForThreadExit)
IF (lnSuccess = 0) THEN
    ? loTunnel.LastErrorText
    RELEASE loTunnel
    CANCEL
ENDIF

RELEASE loTunnel