在 C++ 中驗證對要求資源的用戶端存取

呼叫IAzClientCoNtext介面的AccessCheck方法，以檢查用戶端是否可以存取一或多個作業。 用戶端可能具有多個角色的成員資格，而且作業可能會指派給多個工作，因此授權管理員會檢查所有角色和工作。 如果用戶端所屬的任何角色包含任何包含作業的工作，則會授與該作業的存取權。

若只要檢查用戶端所屬單一角色的存取權，請設定IAzClientCoNtext介面的RoleForAccessCheck屬性。

初始化授權原則存放區以進行存取檢查時，您必須傳遞零作為IAzAuthorizationStore：：Initialize方法之 lFlags參數的值。

下列範例示範如何檢查用戶端對作業的存取權。 此範例假設在磁片磁碟機 C 的根目錄中有名為 MyStore.xml 的現有 XML 原則存放區、此存放區包含名為 Expense 的應用程式，以及名為 UseFormControl 的作業，以及變數 hToken 包含有效的用戶端權杖。

#include <windows.h>
#include <stdio.h>
#include <azroles.h>

void CheckAccess(ULONGLONG hToken)
{
    IAzAuthorizationStore* pStore = NULL;
    IAzApplication* pApp = NULL;
    IAzClientContext* pClientContext = NULL;
    IAzOperation* pOperation = NULL;
    BSTR storeName = NULL;
    BSTR appName = NULL;
    BSTR operationName = NULL;
    BSTR objectName = NULL;
    LONG operationID;
    HRESULT hr;
    VARIANT varOperationIdArray;
    VARIANT varOperationId;
    VARIANT varResultsArray;
    VARIANT varResult;
    void MyHandleError(char *s);

    VARIANT myVar;
    VariantInit(&myVar);//.vt) = VT_NULL;

    //  Initialize COM.
    hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not initialize COM.");

    //  Create the AzAuthorizationStore object.
    hr = CoCreateInstance(
   /*"b2bcff59-a757-4b0b-a1bc-ea69981da69e"*/
         __uuidof(AzAuthorizationStore),
         NULL,
         CLSCTX_ALL,
   /*"edbd9ca9-9b82-4f6a-9e8b-98301e450f14"*/
         __uuidof(IAzAuthorizationStore),
         (void**)&pStore);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not create AzAuthorizationStore object.");

    //  Allocate a string for the  policy store.
    if(!(storeName = SysAllocString(L"msxml://c:\\myStore.xml")))
        MyHandleError("Could not allocate string.");
    
    //  Initialize the store.
    hr = pStore->Initialize(0, storeName, myVar);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not initialize store.");

    //  Create an application object.
    if (!(appName = SysAllocString(L"Expense")))
        MyHandleError("Could not allocate application name string.");
    hr = pStore->OpenApplication(appName, myVar, &pApp);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not open application.");

    //  Create a client context from a token handle.
    hr = pApp->InitializeClientContextFromToken(hToken, myVar,
   &pClientContext);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not create client context.");

    //  Set up parameters for access check.

    //  Set up the object name.
    if (!(operationName = SysAllocString(L"UseFormControl")))
        MyHandleError("Could not allocate operation name string.");

    //  Get the ID of the operation to check.
    hr = pApp->OpenOperation(operationName, myVar, &pOperation);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not open operation.");

    hr = pOperation->get_OperationID(&operationID);
    if(!(SUCCEEDED(hr)))
        MyHandleError("Could not get operation ID.");

    //  Create a SAFEARRAY for the operation ID.
    varOperationIdArray.parray = SafeArrayCreateVector(VT_VARIANT, 0, 1);

    //  Set SAFEARRAY type.
    varOperationIdArray.vt = VT_ARRAY | VT_VARIANT;

    //  Create an array of indexes.
    LONG* index = new LONG[1];
    index[0] = 0;

    //  Populate a SAFEARRAY with the operation ID.
    varOperationId.vt = VT_I4;
    varOperationId.lVal = operationID;

    hr = SafeArrayPutElement(varOperationIdArray.parray, index,
   &varOperationId);
    if(!(SUCCEEDED(hr)))
        MyHandleError("Could not put operation ID in array.");

    if(!(objectName = SysAllocString(L"UseFormControl")))//used for audit
        MyHandleError("Could not allocate object name string.");

    //  Check access.
    hr = pClientContext->AccessCheck(
        objectName,
        myVar,
        varOperationIdArray,
        myVar,               // use default application scope
        myVar,
        myVar,
        myVar,
        myVar,
        &varResultsArray);

    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not complete access check.");

    hr = SafeArrayGetElement(varResultsArray.parray, index, &varResult);
    if (!(SUCCEEDED(hr)))
        MyHandleError("Could not get result from array.");

    if (varResult.lVal == 0)
        printf("Access granted.\n");
    else
        printf("Access denied.\n");
    

    //  Clean up resources.
    pStore->Release();
    pApp->Release();
    pClientContext->Release();
    pOperation->Release();
    SysFreeString(storeName);
    SysFreeString(appName);
    SysFreeString(operationName);
    SysFreeString(objectName);
    VariantClear(&myVar);
    VariantClear(&varOperationIdArray);
    VariantClear(&varOperationId);
    VariantClear(&varResultsArray);
    VariantClear(&varResult); 
    CoUninitialize();
}

void MyHandleError(char *s)
{
    printf("An error occurred in running the program.\n");
    printf("%s\n",s);
    printf("Error number %x\n.",GetLastError());
    printf("Program terminating.\n");
    exit(1);
}