启用服务帐户对 SCP 属性的访问

项目
10/13/2023

下面的代码示例在服务连接点 (SCP) 对象上设置了一对访问控制条目 (ACE)。该 ACE 授予对运行服务实例的用户或计算机帐户的读/写访问权限。该服务安装程序使用类似于下例的代码来确保服务可以在运行时更新其属性。如果未设置类似于这些的 ACE，则服务将无权访问 SCP 的属性。

通常，服务安装程序会在创建 SCP 对象后设置这些 ACE。有关详细信息，以及创建 SCP 并调用此函数的代码的示例，请参阅客户端如何查找和使用服务连接点。如果将服务重新配置为在不同的帐户下运行，则必须更新 ACE。要成功运行，必须在域管理员的安全上下文中运行此代码示例。

该示例函数的第一个参数指定要授予访问权限的用户帐户的名称。该函数假定该名称采用 Domain**\**UserName 格式。如果未指定帐户，则该函数假定服务使用 LocalSystem 帐户。这意味着该函数必须授予对运行服务的宿主服务器的计算机帐户的访问权限。为此，代码示例调用了 GetComputerObjectName 函数以获取本地计算机的域和用户名。

可以修改以下代码示例以授予服务对 SCP 对象的完全访问权限，但最佳做法是仅授予服务在运行时所需的特定访问权限。在这种情况下，该函数授予对两个属性的访问权限。

properties	说明
serviceDNSName	运行服务的宿主服务器的名称。
serviceBindingInformation	服务启动时更新的专用绑定信息。

每个属性由属性的 attributeSchema 类的 schemaIDGUID 标识。架构中的每个属性都有自己唯一的 schemaIDGUID。下面的代码示例使用字符串来指定 GUID。 GUID 字符串采用以下格式，其中每个“X”都替换为十六进制数字：{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}。

请参阅 Active Directory 架构参考页，了解分配给属性用于授予或拒绝访问权限的 schemaIDGUID 值。

下面的代码示例使用 IADsSecurityDescriptor、IADsAccessControlList 和 IADsAccessControlEntry 接口来执行以下操作。

获取 SCP 对象的安全描述符。
在安全描述符的自由访问控制列表 (DACL) 中设置相应的 ACE。
修改 SCP 对象的安全描述符。

#include <atlbase.h>

//******************************
//
//  AllowAccessToScpProperties()
//
//******************************

HRESULT AllowAccessToScpProperties(
    LPWSTR wszAccountSAM,   // Service account to allow access.
    IADs *pSCPObject)       // IADs pointer to the SCP object.
{
    HRESULT hr = E_FAIL;
    IADsAccessControlList *pACL = NULL;
    IADsSecurityDescriptor *pSD = NULL;
    IDispatch *pDisp = NULL;
    IADsAccessControlEntry *pACE1 = NULL;
    IADsAccessControlEntry *pACE2 = NULL;
    IDispatch *pDispACE = NULL;
    long lFlags = 0L;
    CComBSTR sbstrTrustee;
    CComBSTR sbstrSecurityDescriptor = L"nTSecurityDescriptor";
    VARIANT varSD;

    if(NULL == pSCPObject)
    {
        return E_INVALIDARG;
    }
    
    VariantInit(&varSD);
     
    /*
    If no service account is specified, service runs under 
    LocalSystem. Allow access to the computer account of the 
    service's host.
    */
    if (wszAccountSAM) 
    {
        sbstrTrustee = wszAccountSAM;
    }
    else
    {
        LPWSTR pwszComputerName;
        DWORD dwLen;
        
        // Get the size required for the SAM account name.
        dwLen = 0;
        GetComputerObjectNameW(NameSamCompatible, 
            NULL, &dwLen);
        
        pwszComputerName = new WCHAR[dwLen + 1];
        if(NULL == pwszComputerName)
        {
            hr = E_OUTOFMEMORY;
            goto cleanup;
        }

        /*
        Get the SAM account name of the computer object for 
        the server.
        */
        if(!GetComputerObjectNameW(NameSamCompatible,
            pwszComputerName, &dwLen))
        {
            delete pwszComputerName;
            
            hr = HRESULT_FROM_WIN32(GetLastError());
            goto cleanup;
        }

        sbstrTrustee = pwszComputerName;
        wprintf(L"GetComputerObjectName: %s\n", pwszComputerName);
        delete pwszComputerName;
    } 

    // Get the nTSecurityDescriptor.
    hr = pSCPObject->Get(sbstrSecurityDescriptor, &varSD);
    if (FAILED(hr) || (varSD.vt != VT_DISPATCH)) 
    {
        _tprintf(TEXT("Get nTSecurityDescriptor failed: 0x%x\n"), hr);
        goto cleanup;
    } 
     
    /*
    Use the V_DISPATCH macro to get the IDispatch pointer from 
    VARIANT structure and QueryInterface for an 
    IADsSecurityDescriptor pointer.
    */
    hr = V_DISPATCH( &varSD )->QueryInterface(
        IID_IADsSecurityDescriptor,
        (void**)&pSD);
    if (FAILED(hr)) 
    {
        _tprintf(
            TEXT("Cannot get IADsSecurityDescriptor: 0x%x\n"), 
            hr);
        goto cleanup;
    } 
     
    /*
    Get an IADsAccessControlList pointer to the security 
    descriptor's DACL.
    */
    hr = pSD->get_DiscretionaryAcl(&pDisp);
    if (SUCCEEDED(hr))
    {
        hr = pDisp->QueryInterface(
            IID_IADsAccessControlList,
            (void**)&pACL);
    }
    if (FAILED(hr)) 
    {
        _tprintf(TEXT("Cannot get DACL: 0x%x\n"), hr);
        goto cleanup;
    } 
     
    // Create the COM object for the first ACE.
    hr = CoCreateInstance(CLSID_AccessControlEntry,
                        NULL,
                        CLSCTX_INPROC_SERVER,
                        IID_IADsAccessControlEntry,
                        (void **)&pACE1);
     
    // Create the COM object for the second ACE.
    if (SUCCEEDED(hr))
    {
        hr = CoCreateInstance(CLSID_AccessControlEntry,
                        NULL,
                        CLSCTX_INPROC_SERVER,
                        IID_IADsAccessControlEntry,
                        (void **)&pACE2);
    }
    if (FAILED(hr)) 
    {
        _tprintf(TEXT("Cannot create ACEs: 0x%x\n"), hr);
        goto cleanup;
    } 
     
    // Set the properties of the two ACEs.
                                
    // Allow read and write access to the property.
    hr = pACE1->put_AccessMask(
        ADS_RIGHT_DS_READ_PROP | ADS_RIGHT_DS_WRITE_PROP);
    hr = pACE2->put_AccessMask( 
        ADS_RIGHT_DS_READ_PROP | ADS_RIGHT_DS_WRITE_PROP);
                                
    // Set the trustee, which is either the service account or the 
    // host computer account.
    hr = pACE1->put_Trustee( sbstrTrustee );
    hr = pACE2->put_Trustee( sbstrTrustee );
                                
    // Set the ACE type.
    hr = pACE1->put_AceType( ADS_ACETYPE_ACCESS_ALLOWED_OBJECT );
    hr = pACE2->put_AceType( ADS_ACETYPE_ACCESS_ALLOWED_OBJECT );
                                
    // Set AceFlags to zero because ACE is not inheritable.
    hr = pACE1->put_AceFlags( 0 );
    hr = pACE2->put_AceFlags( 0 );
     
    // Set Flags to indicate an ACE that protects a specified object.
    hr = pACE1->put_Flags( ADS_FLAG_OBJECT_TYPE_PRESENT );
    hr = pACE2->put_Flags( ADS_FLAG_OBJECT_TYPE_PRESENT );
     
    // Set ObjectType to the schemaIDGUID of the attribute.
    // serviceDNSName
    hr = pACE1->put_ObjectType( 
        L"{28630eb8-41d5-11d1-a9c1-0000f80367c1}"); 
    // serviceBindingInformation
    hr = pACE2->put_ObjectType( 
        L"{b7b1311c-b82e-11d0-afee-0000f80367c1}"); 
     
    /*
    Add the ACEs to the DACL. Need an IDispatch pointer for 
    each ACE to pass to the AddAce method.
    */
    hr = pACE1->QueryInterface(IID_IDispatch,(void**)&pDispACE);
    if (SUCCEEDED(hr))
    {
        hr = pACL->AddAce(pDispACE);
    }
    if (FAILED(hr)) 
    {
        _tprintf(TEXT("Cannot add first ACE: 0x%x\n"), hr);
        goto cleanup;
    }
    else 
    {
        if (pDispACE)
            pDispACE->Release();
    
        pDispACE = NULL;
    }
     
    // Repeat for the second ACE.
    hr = pACE2->QueryInterface(IID_IDispatch, (void**)&pDispACE);
    if (SUCCEEDED(hr))
    {
        hr = pACL->AddAce(pDispACE);
    }
    if (FAILED(hr)) 
    {
        _tprintf(TEXT("Cannot add second ACE: 0x%x\n"), hr);
        goto cleanup;
    }
     
    // Write the modified DACL back to the security descriptor.
    hr = pSD->put_DiscretionaryAcl(pDisp);
    if (SUCCEEDED(hr))
    {
        /*
        Write the ntSecurityDescriptor property to the 
        property cache.
        */
        hr = pSCPObject->Put(sbstrSecurityDescriptor, varSD);
        if (SUCCEEDED(hr))
        {
            // SetInfo updates the SCP object in the directory.
            hr = pSCPObject->SetInfo();
        }
    }
                                    
    cleanup:
    if (pDispACE)
        pDispACE->Release();
                        
    if (pACE1)
        pACE1->Release();
                    
    if (pACE2)
        pACE2->Release();
                    
    if (pACL)
        pACL->Release();
               
    if (pDisp)
        pDisp->Release();
            
    if (pSD)
        pSD->Release();
 
    VariantClear(&varSD);
 
    return hr;
}

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启用服务帐户对 SCP 属性的访问

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