Xbase++

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 nSuccess
LOCAL oTunnel
LOCAL nSshPort
LOCAL cPassword
LOCAL oPrivKey
LOCAL cKeyText
LOCAL nWaitForThreadExit

nSuccess := 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.

oTunnel := CreateObject("Chilkat.SshTunnel")

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

//  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
//  does not authenticate yet.
nSshPort := 22
nSuccess := oTunnel:Connect("ssh.example.com", nSshPort)
IF (nSuccess == 0)
    ? oTunnel:LastErrorText
    oTunnel:destroy()
    RETURN
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.
cPassword := "mySshPassword"

//  Load the SSH private key.  LoadText reads the file's text, which is then imported.
oPrivKey := CreateObject("Chilkat.SshKey")
cKeyText := oPrivKey:LoadText("qa_data/id_rsa")
IF (oPrivKey:LastMethodSuccess == 0)
    ? oPrivKey:LastErrorText
    oTunnel:destroy()
    oPrivKey:destroy()
    RETURN
ENDIF

nSuccess := oPrivKey:FromOpenSshPrivateKey(cKeyText)
IF (nSuccess == 0)
    ? oPrivKey:LastErrorText
    oTunnel:destroy()
    oPrivKey:destroy()
    RETURN
ENDIF

nSuccess := oTunnel:AuthenticatePwPk("mySshLogin", cPassword, oPrivKey)
IF (nSuccess == 0)
    ? oTunnel:LastErrorText
    oTunnel:destroy()
    oPrivKey:destroy()
    RETURN
ENDIF

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

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

nWaitForThreadExit := 1
nSuccess := oTunnel:CloseTunnel(nWaitForThreadExit)
IF (nSuccess == 0)
    ? oTunnel:LastErrorText
    oTunnel:destroy()
    oPrivKey:destroy()
    RETURN
ENDIF

oTunnel:destroy()
oPrivKey:destroy()