Visual FoxPro

SSH Tunnel Authenticate with Password and Private Key

Demonstrates the Chilkat SshTunnel.AuthenticatePwPk method, which authenticates with a server that requires both a password and a private key. The arguments are the username, the password, and an SshKey private key.

Note: The private-key path is relative to the application's current working directory. Absolute paths may also be used. 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 deployments mandate two-factor SSH. This method satisfies that policy in one call, combining something you know (the password) with something you have (the key). The password should come from a secure source rather than a literal.

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LOCAL lnSuccess
LOCAL loTunnel
LOCAL lnSshPort
LOCAL lcPassword
LOCAL loPrivKey
LOCAL lcKeyText
LOCAL lnWaitForThreadExit

lnSuccess = 0

*  Demonstrates the SshTunnel.AuthenticatePwPk method, which authenticates with an SSH 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.

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"

*  Load the SSH private key.  LoadText reads the file's text, which is then imported.
loPrivKey = CreateObject('Chilkat.SshKey')
lcKeyText = loPrivKey.LoadText("qa_data/id_rsa")
IF (loPrivKey.LastMethodSuccess = 0) THEN
    ? loPrivKey.LastErrorText
    RELEASE loTunnel
    RELEASE loPrivKey
    CANCEL
ENDIF

lnSuccess = loPrivKey.FromOpenSshPrivateKey(lcKeyText)
IF (lnSuccess = 0) THEN
    ? loPrivKey.LastErrorText
    RELEASE loTunnel
    RELEASE loPrivKey
    CANCEL
ENDIF

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

? "Authenticated with a password and a private key."

*  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
    RELEASE loPrivKey
    CANCEL
ENDIF

RELEASE loTunnel
RELEASE loPrivKey