(PureBasic) SFTP use Cert's Private Key for Authentication (Windows)

Demonstrates how to use the private key of a pre-installed certificate (on Windows) for SFTP authentication. The certificate's private key must be marked as "exportable" when originally installed.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkSshKey.pb"
IncludeFile "CkCert.pb"
IncludeFile "CkPrivateKey.pb"
IncludeFile "CkSFtp.pb"

Procedure ChilkatExample()

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

    cert.i = CkCert::ckCreate()
    If cert.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Load the certificate from the Windows certificate store
    success.i = CkCert::ckLoadByCommonName(cert,"my_cert_common_name")
    If success = 0
        Debug CkCert::ckLastErrorText(cert)
        CkCert::ckDispose(cert)
        ProcedureReturn
    EndIf

    ; Get the private key.  
    privKey.i = CkCert::ckExportPrivateKey(cert)
    If CkCert::ckLastMethodSuccess(cert) = 0
        Debug CkCert::ckLastErrorText(cert)
        CkCert::ckDispose(cert)
        ProcedureReturn
    EndIf

    privKeyPem.s = CkPrivateKey::ckGetPkcs8Pem(privKey)
    If CkPrivateKey::ckLastMethodSuccess(privKey) = 0
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkCert::ckDispose(cert)
        ProcedureReturn
    EndIf

    sshKey.i = CkSshKey::ckCreate()
    If sshKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkSshKey::ckFromOpenSshPrivateKey(sshKey,privKeyPem)
    If success = 0
        Debug CkSshKey::ckLastErrorText(sshKey)
        CkCert::ckDispose(cert)
        CkSshKey::ckDispose(sshKey)
        ProcedureReturn
    EndIf

    ; Connect to an SSH/SFTP server
    sftp.i = CkSFtp::ckCreate()
    If sftp.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkSFtp::ckConnect(sftp,"sftp.example.com",22)
    If success = 0
        Debug CkSFtp::ckLastErrorText(sftp)
        CkCert::ckDispose(cert)
        CkSshKey::ckDispose(sshKey)
        CkSFtp::ckDispose(sftp)
        ProcedureReturn
    EndIf

    ; Authenticate with the SSH server using a username + private key.
    ; (The private key serves as the password.  The username identifies
    ; the SSH user account on the server.)
    success = CkSFtp::ckAuthenticatePk(sftp,"mySshLogin",sshKey)
    If success = 0
        Debug CkSFtp::ckLastErrorText(sftp)
        CkCert::ckDispose(cert)
        CkSshKey::ckDispose(sshKey)
        CkSFtp::ckDispose(sftp)
        ProcedureReturn
    EndIf

    Debug "OK, the connection and authentication with the SSH server is completed."

    ; This example is only to show the connection + authentication using a private key associated with a certificate in the Windows certificate store...


    CkCert::ckDispose(cert)
    CkSshKey::ckDispose(sshKey)
    CkSFtp::ckDispose(sftp)


    ProcedureReturn
EndProcedure