Il concorso del filtro di WMI - siete il cavaliere in armatura brillante?
Benvenuto a “La ricerca per il filtro santo del tavolo WMI„, ciò è una ricerca globale di che cosa potreste chiamare “Il filtro perfetto del tavolo WMI". Un filtro di WMI che, usando la lingua di domanda di WMI (WQL), dovrebbe potere macchiare i calcolatori DESKTOP soltanto. Dovrebbe essere una domanda generale - significato che dovrebbe essere possibile utilizzare il filtro nella maggior parte dei ambienti attivi dell'indice intorno al globo per la filtrazione di politica del gruppo.
Così, che cosa è un tavolo realmente? Bene, realmente in questo caso diremo che è l'opposto di un laptop. Hmm, allora che cosa è un laptop? Abbastanza facile: un calcolatore con una batteria! Abbiamo ottenuto il filtro di WMI per l'individuazione dei laptops già:
Selezioni * a partire da Win32_Battery - giusto non amate la semplicità in questa domanda?
Questo filtro farà un calcolatore con una batteria rispondere indietro con “ALLINEARE„ (perché il caso del codice categoria di WMI è presente), significando che un GPO con questo filtro si applicherà ai calcolatori con le batterie. Destra semplice? E potreste pensare che fosse facile “da girarlo appena intorno„ verso i tavoli del ritrovamento, come:
Selezioni * a partire da Win32_Battery dove disponibilità! = 2
o
Selezioni * a partire da Win32_Battery dove la disponibilità NON È NULLA
o
“Dove non la X gradisce Y„ o qualunque
Forse è, forse esso non è… Penso che sia duro abbastanza maledetto! a macchiare i laptops potremmo verificare i codici categoria Win32_PortableBattery, Win32_PCMCIAController, Win32_POTSModem pure - ma penso in qualche modo che la maggior parte della gente accosenta, che “ting essenziale„, che rende ad un laptop un laptop, è in effetti la presenza della batteria!
Ma, le nostre prove per la macchia dei TAVOLI soltanto (macchine senza una batteria - sì, so che questa includerà gli assistenti come “uno stazionario„ ugualmente) non sono state un successo ancora! Abbiamo bisogno probabilmente appena della sintassi corretta? E questo è dove entrate nell'immagine!
Potete spezzare aperto questo dado? Ci è un prezzo freddo!
Il questo interamente iniziato su una lista spedente per i tipi di politica del gruppo e le ragazze - GPTalk denominato - generate ed effettuate dal guru del Group la Policy e da MVP Darren Guastano-Elia - il tipo dietro GPOguy.com e Software di SDM. Potete unire la lista DESTRA QUI e partecipi a questo concorso a VINCA una copia libera del:
GPExpert™ che effettua un analisi guasti di Pak
MA dovete essere la prima persona per spezzare questa cosa, là sarete soltanto UN VINCITORE che potreste essere!
Valuterò le risposte ricevute - FIFO: " In primo luogo dentro in primo luogo fuori" method is used. Hopefully we'll see the most simple solution first - simplicity works, right? Actually I wouldn't know in this case would I...
One important thing! We will ask you kindly to TEST any WMI query submissions before sending them to everybody on the list. During your testing, you should use a tool to verify the WMI filter against a minimum of 2 desktops and 2 laptops. You can use the free WMI Filter Validation Tool to test you WMI filters in your environment. Personally I’m also using Scriptomatic version 2 and WBEMTEST for finding the available classes, items, queries etc.
Please have a look at the "rules" further down!
Why do this? Well, because it's fun - and useful at the same time... When looking at it generally, the purpose of this filter is to say: "I want these user settings to apply, but only when the user logs on to stationary machines". This can be used for a lot of security related setting, eg. in the case where Automatically cached Offline Files/Folders are unwanted on stationary machines for certain users etc. The job of most WMI filters placed on User policies is to limit which machines the policy setting(s) should apply to (even though WMI filters could check for user specific things too). Besides from that it's a nice challenge, we can pretty easily "spot" laptops, as they have batteries – and desktops don’t, but that’s not good enough for Mr. WQL, is it?!
Stuff we have tried - and the rules
We’ve been around solutions looking for Win32_SystemEnclosure > ChassisType before - which basically doesn’t work in a WMI filter because that’s an Array (and yes, I've also seen lots of posts on forums out there claiming that particular class is the solution – but for WMI/WQL queries it’s not). If would work in a script (because you can add additional logic to scripts), but we are searching for a WMI Filter - not workarounds of any kind!
As mentioned we tried with the Win32_Battery WMI class. However, as desktops don’t know this class at all, they'll return FALSE no matter what. Basically a desktop computer is gonna say “Heck, I don’t know anything about that class *Panic* I’m out!” – or just “False”... Bummer!
We have also tried PowerSupplyState, Win32_DesktopMonitor, Win32_DisplayConfiguration, Win32_SystemSlot, Win32_Fan and other classes – just haven’t found the perfect “this is definitely a desktop WMI item value or class”…
We're basically looking for something like:
A) Select * from Win32_SomeClassOnlyDesktopsHave
Or
B )Select * from Win32_SomeClass.SomeItem = “SomeValueOnlyDesktopsHave”
Or
C) Some way of saying “if you don’t know the class (eg. Win32_Battery), then apply the GPO anyway”
Again, the “quest” is to find the perfect, *universal*, way of spotting “Non-laptops” or Desktops – it can of course be done by looking for some special computer Manufacturer/Model, BIOS version, specific hardware driver or whatever – but that stuff it most likely gonna be different from environment to environment. Also, if we all just used computer names like “DESKxxx” for desktops and “LAPTxxx” for laptops, we could have used WMI filters for computer name – but unfortunately that’s not the case - or at least I won't consider that a valid solution :)
The thing is, that normally it’s the LAPTOPS that have special hardware – like Batteries and built-in Modems, PCMCIA slots etc. – so they are pretty easy to find. With desktop computers it’s another story – hope you can help us out here!
Please, again, we know lot’s of “workarounds”, but what we need is a *WMI filter* and it has to return *TRUE* for *DESKTOPS* (or let’s call the NON-LAPTOPS or NON-PORTABLES, it doesn’t really matter).
Remember, simplicity works - maybe the answer/solution is pretty straight forward? Feel free to post any additional questions to the mailing list!
Another example of what has been tried
We could maybe try to go for presence of PCI (and not Mini-PCI) or AGP slots, as we expect most desktops to have PCI slots (and laptops to have Mini-PCI, but that would depend on the form factor) – or maybe AGP (but does onboard VGA count as AGP? Any PCI VGA cards left out there? Yeah, probably...). If not we could maybe go for something like this:
A) Select * From Win32_SystemSlot Where SlotDesignation = “PCI%”
Or
B) Select * From Win32_SystemSlot Where SlotDesignation = “AGP”
However, this is not accepted as a solution as we cannot say that all desktop computers have AGP slots. But - maybe you can convince us otherwise?
Other cool Group Policy information:
You'll find additional Group Policy information at these sites:
www.gpanswers.com - The home of Group Policy guru and MVP Jeremy Moskowitz, check out the community there too!
TechNet Group Policy Forum - A brand new Group Policy forum on Microsoft TechNet
The Group Policy Team - The home of the Microsoft Group Policy Team
Jakob H. Heidelberg blog - My own blog, mostly about Group Policy and Security
www.heidelbergit.dk - My website with blog RSS, certifications, LinkedIn info etc.
Hope to hear from you soon - O' Yee Knight of the Microsoft Group Policy Table!
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