SQL Server

HTTPS Client Certificate using Smartcard or Token

See more HTTP Examples

Explains how to use a client certificate for HTTP TLS mutual authentication where the certificate and private key exists on an HSM (Smartcard or USB Token). SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- To do HTTPS mutual authentication where the certificate and private key are stored
    -- on a smartcard or token, first load the Chilkat certificate object from the smartcard/token,
    -- and then pass the certificate object to the Http object's SetSslClientCert method.

    -- Doing HTTP mutual authentication is the same regardless of the source of the cert + private key.
    -- The steps are to first load the certificate from the source, then pass the cert object to the HTTP object.
    -- Chilkat provides methods for loading the certificate from a variety of sources, such as smartcards, tokens,
    -- .pfx/.p12 files, Windows registry-based certificate stores, PEM files, or other file formats.
    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT

    -- The easiest way to load a certificate from an HSM is to call cert.LoadFromSmartcard with 
    -- an empty string argument.  Chilkat will detect the HSM and will choose the most appropriate
    -- underlying means for accessing and loading the default certificate + key from the HSM.
    -- The underlying means could be PKCS11, ScMinidriver, or MSCNG, depending on the HSM what it
    -- supports.

    -- For example:
    -- If you know the smart card PIN, it's good to set it prior to loading from the smartcard/USB token.
    EXEC sp_OASetProperty @cert, 'SmartCardPin', '12345678'

    -- To let Chilkat discover what smartcard or token is connected, pass an empty string to LoadFromSmartcard.
    -- When testing in this way, it's best to have only a single smartcard or token connected to the system.
    EXEC sp_OAMethod @cert, 'LoadFromSmartcard', @success OUT, ''
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0

        PRINT 'Certificate not loaded.'
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    -- If there are multiple certificates stored on the smartcard/token, then 
    -- you can be more specific.  See these examples:

    -- Load a Certificate from an HSM by Common Name
    -- Load a Certificate from an HSM by Serial Number

    -- It may be that you need to code at a lower level with a specific
    -- supported interface, such as PKCS11.
    -- See these examples:

    -- Use PKCS11 to Find a Specific Certificate
    -- Use PKCS11 to Find a Certificate with a Specified Key Usage

    -- Once you have the desired certificate, pass it to SetSslClientCert.
    -- Set the certificate to be used for mutual TLS authentication
    -- (i.e. sets the client-side certificate for two-way TLS authentication)
    EXEC sp_OAMethod @http, 'SetSslClientCert', @success OUT, @cert
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END

    -- At this point, the HTTP object instance is setup with the client-side cert, and any SSL/TLS
    -- connection will automatically use it if the server demands a client-side cert.

    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @cert


END
GO