(Visual FoxPro) SSH Authenticate using Smart Card Private Key

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Demonstrates how to use a private key stored on an HSM (smartcard or token) for SSH public-key authentication. (Public-key authentication means the client, which is your application, uses the private key, while the corresponding public key is installed on the server under your SSH account.)

Note: This example requires Chilkat v9.5.0.96 or later.

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LOCAL loPkcs11
LOCAL lcPin
LOCAL lnUserType
LOCAL lnSuccess
LOCAL loJsonTemplate
LOCAL lnPrivKeyHandle
LOCAL lnPubKeyHandle
LOCAL loSshKey
LOCAL loSsh

* This example requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

* Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Pkcs11')
loPkcs11 = CreateObject('Chilkat.Pkcs11')

* Use the PKCS11 driver (.dll, .so, .dylib) for your particular HSM.
* For example:
loPkcs11.SharedLibPath = "C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS11.dll"

* Use your HSM's PIN.
lcPin = "0000"

* Normal user = 1
lnUserType = 1

* Establish a logged-on user session with the HSM.
lnSuccess = loPkcs11.QuickSession(lnUserType,lcPin)
IF (lnSuccess = 0) THEN
    ? loPkcs11.LastErrorText
    RELEASE loPkcs11
    CANCEL
ENDIF

* Provide a template to find a PKCS11 object.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonTemplate = CreateObject('Chilkat.JsonObject')

* Find an RSA private key with the label "MySshKey".
* Here's an example of how the key was originally imported: 
* PKCS11 Import SSH Key
loJsonTemplate.UpdateString("class","private_key")
loJsonTemplate.UpdateString("key_type","rsa")
loJsonTemplate.UpdateString("label","MySshKey")

lnPrivKeyHandle = loPkcs11.FindObject(loJsonTemplate)
IF (lnPrivKeyHandle = 0) THEN
    ? loPkcs11.LastErrorText
    RELEASE loPkcs11
    RELEASE loJsonTemplate
    CANCEL
ENDIF

* The private key handle is only valid during the PKCS11 session.
* If you wish to use the private key in another PKCS11 session,
* you'll first need to find it.  See:  
? "private key handle: " + STR(lnPrivKeyHandle)

* We'll also need the PKCS11 public key handle
* Modify the template by updating the "class" to "public_key"
loJsonTemplate.UpdateString("class","public_key")

lnPubKeyHandle = loPkcs11.FindObject(loJsonTemplate)
IF (lnPubKeyHandle = 0) THEN
    ? loPkcs11.LastErrorText
    RELEASE loPkcs11
    RELEASE loJsonTemplate
    CANCEL
ENDIF

? "public key handle: " + STR(lnPubKeyHandle)

* Create an empty SSH key object, and tell it to use the PKCS11 handles.
* We also need to indicate the key type.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.SshKey')
loSshKey = CreateObject('Chilkat.SshKey')
lnSuccess = loSshKey.UsePkcs11(loPkcs11,lnPrivKeyHandle,lnPubKeyHandle,"rsa")
IF (lnSuccess = 0) THEN
    ? loSshKey.LastErrorText
    RELEASE loPkcs11
    RELEASE loJsonTemplate
    RELEASE loSshKey
    CANCEL
ENDIF

* Create an SSH object and authenticate using the SSH key, which will utilize the existing PKCS11 session.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Ssh')
loSsh = CreateObject('Chilkat.Ssh')

lnSuccess = loSsh.Connect("my-ssh-server.com",22)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loPkcs11
    RELEASE loJsonTemplate
    RELEASE loSshKey
    RELEASE loSsh
    CANCEL
ENDIF

* This is where the PKCS11 private key on the smart card is used.
lnSuccess = loSsh.AuthenticatePk("your_ssh_username",loSshKey)
IF (lnSuccess = 0) THEN
    ? loSsh.LastErrorText
    RELEASE loPkcs11
    RELEASE loJsonTemplate
    RELEASE loSshKey
    RELEASE loSsh
    CANCEL
ENDIF

* Do whatever it is your app needs to do using the authenticated SSH session....
* ...
* ...

loSsh.Disconnect()

loPkcs11.Logout()
loPkcs11.CloseSession()

RELEASE loPkcs11
RELEASE loJsonTemplate
RELEASE loSshKey
RELEASE loSsh