Account Lockout (WinNT Provider)

When the number of failed logon attempts is exceeded, the user account becomes locked out for the number of minutes specified by the lockoutDuration attribute. The IADsUser.IsAccountLocked property appears to be the property to use to read and modify the lockout state of a user account, but the WinNT ADSI provider has restrictions that limit the use of the IsAccountLocked property.

Resetting the Account Lockout Status

When using the WinNT provider, the IsAccountLocked property can only be set to FALSE, which unlocks the account. Attempting to set the IsAccountLocked property to TRUE will fail. Only the system can lock an account.

The following code example demonstrates how to use Visual Basic with ADSI to unlock a user account.

Public Sub UnlockAccount(AccountDN As String)
    Dim usr As IADsUser
    
    ' Bind to the user account.
    Set usr = GetObject("WinNT://" + AccountDN)
    
    ' Set the IsAccountLocked property to False
    usr.IsAccountLocked = False
    
    ' Flush the cached attributes to the server.
    usr.SetInfo
End Sub

The following code example demonstrates how to use C++ with ADSI to unlock a user account.

HRESULT UnlockAccount(LPCWSTR pwszUserDN)
{
    if(!pwszUserDN)
    {
        return E_INVALIDARG;
    }

    // Build the ADsPath.
    CComBSTR sbstr = "WinNT://";
    sbstr += pwszUserDN;
    
    HRESULT hr;
    CComPtr<IADsUser> spADsUser;

    // Bind to the object.
    hr = ADsOpenObject(sbstr,
        NULL,
        NULL,
        ADS_SECURE_AUTHENTICATION,
        IID_IADsUser,
        (void**)&amp;spADsUser);
    if(S_OK != hr)
    {
        return hr;
    }
    
    // Set the IsAccountLocked property to FALSE;
    hr = spADsUser->put_IsAccountLocked(VARIANT_FALSE);

    // Commit the changes to the server.
    hr = spADsUser->SetInfo();

    return hr;
}

Reading the Account Lockout Status

With the WinNT provider, the IsAccountLocked property can be used to determine if an account is locked out. If an account is locked out, the IsAccountLocked property will contain TRUE. If an account is not locked out, the IsAccountLocked property will contain FALSE.

The following code example demonstrates how to use Visual Basic with ADSI to determine if an account is locked out.

Public Function IsAccountLocked(AccountDN As String) As Boolean
    Dim oUser As IADsUser
    
    ' Bind to the object.
    Set oUser = GetObject("WinNT://" + AccountDN)
    
    ' Get the IsAccountLocked property.
    IsAccountLocked = oUser.IsAccountLocked
End Function

The following code example demonstrates how to use C++ with ADSI to determine if an account is locked out.

HRESULT IsAccountLocked(LPCWSTR pwszUserDN, BOOL *pfLocked)
{
    if(!pwszUserDN || !pfLocked)
    {
        return E_INVALIDARG;
    }

    *pfLocked = FALSE;

    // Build the ADsPath.
    CComBSTR sbstr = "WinNT://";
    sbstr += pwszUserDN;
    
    HRESULT hr;
    CComPtr<IADsUser> spADsUser;

    // Bind to the object.
    hr = ADsOpenObject(sbstr,
        NULL,
        NULL,
        ADS_SECURE_AUTHENTICATION,
        IID_IADsUser,
        (void**)&amp;spADsUser);
    if(S_OK != hr)
    {
        return hr;
    }
    
    VARIANT_BOOL vfLocked;
    hr = spADsUser>get_IsAccountLocked(&amp;vfLocked);
    if(S_OK != hr)
    {
        return hr;
    }

    *pfLocked = (vfLocked != 0);

    return hr;
}