IADsAccessControlList::AddAce method (iads.h)

Article
02/22/2024

The IADsAccessControlList::AddAce method adds an IADsAccessControlEntry object to the IADsAccessControlList object.

Syntax

HRESULT AddAce(
  [in] IDispatch *pAccessControlEntry
);

Parameters

[in] pAccessControlEntry

Pointer to the IDispatch interface of the IADsAccessControlEntry object to be added. This parameter cannot be NULL.

Return value

Returns a standard HRESULT value including the following.

Remarks

Access control entries must appear in the following order in a security descriptor's access control list:

Access-denied ACEs that apply to the object itself
Access-denied ACEs that apply to a child of the object, such as a property set or property
Access-allowed ACEs that apply to the object itself
Access-allowed ACEs that apply to a child of the object, such as a property set or property
All inherited ACEs

This method adds the ACE to the front of the ACL, which does not necessarily result in correct ordering.

Examples

The following Visual Basic code example shows how to use the IADsAccessControlList::AddAce method to add two ACEs to an ACL.

Const ACL_REVISION_DS = &H4

Dim x as IADs
Dim sd as IADsSecurityDescriptor
Dim Ace1 As new IADsAccessControlEntry
Dim Ace2 As new IADsAccessControlEntry
Dim Dacl As new IADsAccessControlList
On Error GoTo Cleanup

Set x = GetObject("LDAP://OU=Sales,DC=Fabrikam,DC=com")
Set sd = x.Get("ntSecurityDescriptor")

' Add the ACEs to the Discretionary ACL.
 
Dacl.AclRevision = ACL_REVISION_DS 'DS ACL Revision
' Set up the first ACE.
Ace1.AccessMask = -1 'Full Permission (Allowed)
Ace1.AceType = ADS_ACETYPE_ACCESS_ALLOWED
Ace1.AceFlags = ADS_ACEFLAG_INHERIT_ACE
Ace1.Trustee = "myMachine\Administrator"
 
' Set up the 2nd ACE.
Ace2.AccessMask = -1 'Full Permission (Denied)
Ace2.AceType = ADS_ACETYPE_ACCESS_DENIED
Ace2.AceFlags = ADS_ACEFLAG_INHERIT_ACE
Ace2.Trustee = "aDomain\aUser"
 
' Add the ACEs to the Discretionary ACL.
Dacl.AddAce Ace1
Dacl.AddAce Ace2

'Commit the changes. 
sd.DiscretionaryAcl = Dacl
x.Put "ntSecurityDescriptor", Array(sd)
x.SetInfo

Cleanup:
    If (Err.Number<>0) Then
        MsgBox("An error has occurred. " & Err.Number)
    End If
    Set Ace1 = Nothing
    Set Ace2 = Nothing
    Set Dacl = Nothing
    Set x = Nothing
    Set sd = Nothing

The following C++ code example adds an ACE to an ACL using the IADsAccessControlList::AddAce method. The added ACE has allowed access rights with the full permission.

HRESULT addAceTo(IADsAccessControlList *pAcl)
{
    if(!pAcl) 
    {
        return E_FAIL;
    }

    HRESULT hr = pAcl->put_AclRevision(ACL_REVISION_DS);
    if(FAILED(hr)) 
    {
        return hr;
    }

    IADsAccessControlEntry *pAce = NULL; 
    pAce = createAce(-1,                    // Full permissions.
                     ADS_ACETYPE_ACCESS_ALLOWED,
                     ADS_ACEFLAG_INHERIT_ACE,
                     CComBSTR("aDomain\\aUser"));

    if(!pAce)
    {
        return E_FAIL;
    }

    IDispatch *pDisp;
    hr = pAce->QueryInterface(IID_IDispatch,(void**)&pDisp);
    if(FAILED(hr)) 
    {
        pAce->Release();
        return hr;
    }

    hr = pAcl->AddAce(pDisp);
    pDisp->Release();
    if(pAce) pAce->Release();
    if(FAILED(hr)) 
    {
        return hr;
    }

    printf("Ace has been added to ACL.\n");

    return hr;
}

////////////////////////////////////
// function to create an allowed ACE
////////////////////////////////////
IADsAccessControlEntry *createAce(
                   long mask,
                   long type, 
                   long flag,
                   BSTR trustee)
{
    HRESULT hr;
    IADsAccessControlEntry *pAce;
    hr = CoCreateInstance(CLSID_AccessControlEntry,
                          NULL,
                          CLSCTX_INPROC_SERVER,
                          IID_IADsAccessControlEntry,
                          (void**)&pAce);
    if(FAILED(hr)) 
    {
        if(pAce) 
        {
            pAce->Release();
        }

        return NULL;
    }

    hr = pAce->put_AccessMask(mask); 
    hr = pAce->put_AceType(type);
    hr = pAce->put_AceFlags(flag);
    hr = pAce->put_Trustee(trustee); 

    return pAce;
}

Requirements

Requirement	Value
Minimum supported client	Windows Vista
Minimum supported server	Windows Server 2008
Target Platform	Windows
Header	iads.h
DLL	Activeds.dll

Share via