A competição do filtro de WMI - é você o knight no armor brilhando?
Boa vinda a “O Quest para o filtro Holy do Desktop WMI”, esta é uma busca global para o que você poderia se chamar “O filtro perfeito do Desktop WMI". Um filtro de WMI que, usando a língua de pergunta de WMI (WQL), devesse mancha computadores DESKTOP somente. Deve ser uma pergunta geral - meaning que deve ser possível usar o filtro em a maioria de ambientes ativos do diretório em torno do globo para filtrar da política do grupo.
Assim, que é um desktop realmente? Bem, realmente neste caso nós diremos que é o oposto de um laptop. Hmm, então o que é um laptop? Fácil bastante: um computador com uma bateria! Nós começamos o filtro de WMI para encontrar laptops já:
Selecione * de Win32_Battery - você justo não ama o simplicity nesta pergunta?
Este filtro fará um computador com uma bateria responder para trás com o “VERDADEIRO” (porque o exemplo da classe de WMI está atual), significando que um GPO com este filtro se aplicará aos computadores com baterias. Direita simples? E você pôde pensar que é fácil “o girar apenas em torno” para desktops do achado, como:
Selecione * de Win32_Battery onde disponibilidade! = 2
ou
Selecione * de Win32_Battery onde a disponibilidade NÃO É NULA
ou
“Onde não X gosta de Y” ou o que quer que
Talvez é, talvez ele não é… Eu penso que é duro consideravelmente dum raio! Para manchar laptops nós poderíamos ter testado as classes Win32_PortableBattery, Win32_PCMCIAController, Win32_POTSModem também - mas de algum modo eu penso que a maioria de povos concordarão, que “ting essencial”, que faz a um laptop um laptop, é no fato a presença da bateria!
Mas, nossos testes para manchar DESKTOPS somente (máquinas sem uma bateria - sim, eu sei que esta incluirá usuários como eles um “estacionário” demasiado) não foram um sucesso ainda! Nós necessitamos provavelmente apenas a sintaxe correta? E isto é o lugar aonde você começa no retrato!
Pode você rachar aberto esta porca? Há um preço fresco!
O este começado toda em uma lista enviando para guys da política do grupo e as meninas - GPTalk chamado - criadas e mantidas pelo guru de Grupo Política e pelo MVP Darren Estragam-Elia - o guy atrás GPOguy.com e Software de SDM. Você pode juntar a lista DIREITA AQUI e participe nesta competição a GANHE uma cópia livre do:
GPExpert™ que pesquisa defeitos Pak
MAS você tem que ser a primeira pessoa para rachar esta coisa, lá será somente UM VENCEDOR que poderia ser você!
Eu estarei avaliando respostas entrantes - FIFO: " Primeiramente dentro primeiramente para fora" 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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