使用 IDirectoryObject 获取安全描述符

本主题包含用于获取安全描述符的代码示例。

以下 C++ 代码示例：

• 创建缓冲区。
• 使用 IDirectoryObject 接口获取指定对象的安全描述符。
• 将安全描述符复制到缓冲区。
• 返回指向包含安全描述符数据的 SECURITY_DESCRIPTOR 结构的指针。

HRESULT GetSDFromIDirectoryObject(
    IDirectoryObject *pObject,
    PSECURITY_DESCRIPTOR *pSecurityDescriptor)
{
    HRESULT hr = E_FAIL;
    PADS_ATTR_INFO pAttrInfo;
    DWORD dwReturn= 0;
    LPWSTR pAttrName= L"nTSecurityDescriptor";
    PSECURITY_DESCRIPTOR pSD = NULL;

    if(!pObject || !pSecurityDescriptor)
    {
        return E_INVALIDARG;
    }
 
    // Get the nTSecurityDescriptor.
    hr = pObject->GetObjectAttributes( &pAttrName, 
                                       1, 
                                       &pAttrInfo, 
                                       &dwReturn );
    if((FAILED(hr)) || (dwReturn != 1)) 
    {
        wprintf(L" failed: 0x%x\n", hr);
        return hr;
    }
 
    // Check the attribute name and type.
    if((_wcsicmp(pAttrInfo->pszAttrName,L"nTSecurityDescriptor") == 0) &&
     (pAttrInfo->dwADsType==ADSTYPE_NT_SECURITY_DESCRIPTOR))
    {
        // Get a pointer to the security descriptor.
        pSD = (PSECURITY_DESCRIPTOR)(pAttrInfo->pADsValues->SecurityDescriptor.lpValue);
               
        DWORD SDSize = pAttrInfo->pADsValues->SecurityDescriptor.dwLength;
               
        // Allocate memory for the buffer and copy the security descriptor to the buffer.
        *pSecurityDescriptor = (PSECURITY_DESCRIPTOR)CoTaskMemAlloc(SDSize);
        if (*pSecurityDescriptor)
        {
            CopyMemory((PVOID)*pSecurityDescriptor, (PVOID)pSD, SDSize);
        }
        else
        {
            hr = E_FAIL;
        }

        // Caller must free the memory for pSecurityDescriptor using CoTaskMemFree.
    }
 
    // Free memory used for the attributes retrieved.
    FreeADsMem(pAttrInfo); 
 
    return hr;
}