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Integrated Kerberos Authentication (OLE DB)

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)

Download OLE DB driver

This sample shows how to get mutual Kerberos authentication by using OLE DB in OLE DB Driver for SQL Server. This sample works with SQL Server 2008 (10.0.x) and later versions.

For more information about SPNs and Kerberos authentication, see Service Principal Name (SPN) Support in Client Connections.

Example

You must specify a server. In the .cpp file, change "MyServer" to a machine name that has an instance of SQL Server 2008 (10.0.x) and later versions.

You will also have to specify a customer-provided SPN. In the .cpp file, change "CPSPN" to a customer-provided SPN.

Make sure your INCLUDE environment variable includes the directory that contains msoledbsql.h. Compile with ole32.lib oleaut32.lib.

// compile with: ole32.lib oleaut32.lib
#pragma once

#define WIN32_LEAN_AND_MEAN   // Exclude rarely-used stuff from Windows headers
#include <stdio.h>
#include <tchar.h>
#include <msoledbsql.h>

#define CHECKHR(stmt) \
do\
{\
    hr = (stmt);\
    if (FAILED(hr))\
    {\
       printf("CHECK_HR " #stmt " failed at (%hs, %d), hr=0x%08X\r\n", __FILE__, __LINE__, hr); \
       goto CleanUp; \
    } \
} while (0)

#define SAFERELEASE(p) \
do\
{\
    if ((p) != nullptr)\
    {\
       p->Release(); \
       p = nullptr; \
    } \
} while (0)


int _tmain(int argc, _TCHAR* argv[])
{
    HRESULT hr = S_OK;
    IDBInitialize* pInitialize = nullptr;
    IDBProperties* pProperties = nullptr;
    DBPROP rgDBProp[1] = {};
    LPCWSTR lpwszProviderString = L"Server=MyServer;"   // server with SQL Server 2008 (or later)
       L"Trusted_Connection=Yes;"
       L"Encrypt=Mandatory;"
       L"ServerSPN=CP_SPN;";   // customer-provided SPN

    DBPROPSET* prgPropertySets = nullptr;
    ULONG cPropertySets = 0;

    CHECKHR(CoInitialize(nullptr));
    CHECKHR(CoCreateInstance(CLSID_MSOLEDBSQL, nullptr, CLSCTX_INPROC_SERVER, __uuidof(IDBProperties), reinterpret_cast<void**>(&pProperties)));

    // set provider string
    rgDBProp[0].dwPropertyID = DBPROP_INIT_PROVIDERSTRING;
    rgDBProp[0].dwOptions = DBPROPOPTIONS_REQUIRED;
    rgDBProp[0].colid = DB_NULLID;
    VariantInit(&(rgDBProp[0].vValue));
    V_VT(&(rgDBProp[0].vValue)) = VT_BSTR;
    V_BSTR(&(rgDBProp[0].vValue)) = SysAllocString(lpwszProviderString);

    { // set the property to the property set
        DBPROPSET PropertySet[1] = {};
        PropertySet[0].rgProperties = &rgDBProp[0];
        PropertySet[0].cProperties = 1;
        PropertySet[0].guidPropertySet = DBPROPSET_DBINIT;

        // set properties and connect to server
        CHECKHR(pProperties->SetProperties(sizeof(PropertySet)/sizeof(DBPROPSET), PropertySet));
    }

    CHECKHR(pProperties->QueryInterface<IDBInitialize>(&pInitialize));
    CHECKHR(pInitialize->Initialize());

    { // get properties
        DBPROPIDSET rgDBPropIDSet[1] = {};

        DBPROPID rgDBPropID[2] = {};
        rgDBPropID[0] = SSPROP_INTEGRATEDAUTHENTICATIONMETHOD;
        rgDBPropID[1] = SSPROP_MUTUALLYAUTHENTICATED;

        rgDBPropIDSet[0].rgPropertyIDs = &rgDBPropID[0];
        rgDBPropIDSet[0].cPropertyIDs = 2;
        rgDBPropIDSet[0].guidPropertySet = DBPROPSET_SQLSERVERDATASOURCEINFO;
        CHECKHR(pProperties->GetProperties(1, rgDBPropIDSet, &cPropertySets, &prgPropertySets));
    }
    wprintf(L"Authentication method: %s\r\n", V_BSTR(&(prgPropertySets[0].rgProperties[0].vValue)));
    wprintf(L"Mutually authenticated: %s\r\n",
        (V_BOOL(&(prgPropertySets[0].rgProperties[1].vValue)) == VARIANT_TRUE) ? L"yes" : L"no");

CleanUp:
    SAFERELEASE(pProperties);
    SAFERELEASE(pInitialize);

    if (prgPropertySets)
    {
        for (ULONG iPropSet = 0; iPropSet < cPropertySets; ++iPropSet)
        {
            for (ULONG iProp = 0; iProp < prgPropertySets[iPropSet].cProperties; ++iProp)
            {
                VariantClear(&prgPropertySets[iPropSet].rgProperties[iProp].vValue);
            }
        }
    }

    VariantClear(&(rgDBProp[0].vValue));
    CoUninitialize();
}