(SQL Server) Socket TLS Mutual Authentication (Client-Side Certificate)

This example demonstrates how to provide a client-side certificate, also known as "two-way authentication" or "mutual authentication" for servers that require a client certificate.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @sock int
    -- Use "Chilkat_9_5_0.Socket" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Socket', @sock OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Set the certificate to be used for mutual TLS authentication
    -- (i.e. sets the client-side certificate for two-way TLS authentication)
    DECLARE @success int
    EXEC sp_OAMethod @sock, 'SetSslClientCertPfx', @success OUT, '/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx', 'pfxPassword'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @sock, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sock
        RETURN
      END

    -- Note: The certificate used for the client-side of TLS mutual authentication
    -- must have the associated private key available. (.pfx/.p12 files typically store both
    -- the certificate and associated private key.)

    -- Establish the connection using the socket object (with client certificate authentication).
    DECLARE @bTls int
    SELECT @bTls = 1
    DECLARE @port int
    SELECT @port = 443
    DECLARE @maxWaitMs int
    SELECT @maxWaitMs = 5000
    EXEC sp_OAMethod @sock, 'Connect', @success OUT, 'www.example.com', @port, @bTls, @maxWaitMs
    IF @success <> 1
      BEGIN

        EXEC sp_OAGetProperty @sock, 'ConnectFailReason', @iTmp0 OUT
        PRINT 'Connect Failure Error Code: ' + @iTmp0
        EXEC sp_OAGetProperty @sock, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sock
        RETURN
      END

    -- At this point, the Socket object is connected and authenticated using the client-side cert

    -- ...
    -- ..

    EXEC @hr = sp_OADestroy @sock


END
GO