验证客户端对 C++ 中请求资源的访问权限

调用 IAzClientContext 接口的 AccessCheck 方法以检查客户端是否有权访问一个或多个操作。 一个客户端可能具有多个角色的成员身份，并且一个操作可能分配给多个任务，因此授权管理器会检查所有角色和任务。 如果客户端所属的任何角色包含任何包含操作的任务，则会授予对该操作的访问权限。

若要仅检查客户端所属的单个角色的访问权限，请设置 IAzClientContext 接口的 RoleForAccessCheck 属性。

为访问检查初始化授权策略存储时，必须将零作为 IAzAuthorizationStore：：Initialize 方法的 lFlags 参数的值传递。

以下示例演示如何检查客户端对操作的访问权限。 该示例假定驱动器 C 根目录中有一个名为 MyStore.xml 的现有 XML 策略存储，此存储包含名为 Expense 的应用程序和名为 UseFormControl 的操作，并且变量 hToken 包含有效的客户端令牌。

#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);
}