Using SCOM as a basic configuration audit system – Part 2 the script

Previous posts on the subject:

The first step for our compliance management pack is to develop the core checking script. This is not to say that this must be the approach for every MP, probably a better start would be the health model, nevertheless I want to immediately check if there’s any showstopper in the core stuff so I will address the health model in the following post.

To build the script we need to keep in mind that:

– the output will be used to assess compliance on one side and to return data that can be used in reporting and in alerts to show what’s going on.

– The script must be generic enough to work across different OS versions, this is why we’re using vbscript

– The script will be targeted to a specific baseline

– The patches list must not be hard coded since the whole list can change between OS versions and can be adjusted to address specific needs (via overrides)

– The script will need to check for proper OS version, proper Windows Scripting Host version and proper patches

Given these requirements the script will take in input:

– Desired OS version (for the given baseline, for example we can set that for Windows 2008 the minimum service pack supported is service pack 2)

– Comma delimited list of required patches (IGNORE to skip the check)

– Required Windows Script Host version (typically at least 5.7, IGNORE to skip the check)

The script will return a property bag with the following properties for generic assessment:

– OS compliance

– Patches compliance

– WSH compliance

And the following properties for descriptive purposes:

– OS version

– WSH version

– One entry for each patch listed telling if the patch is present or not

– A description to be used in alerting with the reason for the missing compliance

The script logic is pretty simple:

– Load all the required patches into a dictionary, the dictionary will tell if the patch is present or not and will be the base for building the patches part of the returned property bag

– Check for OS version using Win32_OperatingSystem wmi class

– Check for windows scripting host version, id the parameter is set to IGNORE then it is assumed wsh is compliant

– Check for the presence of the required patches using the Win32_QuickFixEngineering wmi class. As stated in the comments, I will first check for an exact match and if not successful I will check for patches version using the –v? postfix

– Finally using the results gathered the script builds the property bag and a descriptive property to be used in alerting

Note. The following code will miss all the error checking stuff. Before you put anything in production I strongly suggest a strong parameters checking and some WMI error management. I left the error checking code out of the picture to make the script shorter and more readable.

Option Explicit
SetLocale ("en-us")

Dim g_API, g_oXML
Dim g_StdErr
Dim P_TraceLevel, P_OSVer, P_QFEList, P_WSHVersion

'On Error Resume Next

Dim dtStart, oArgs
Dim dicQFEs, qfe, oQFEs
Dim i, oWMI, oWMIOS, OSVersion, Keys
Dim oBag, bOSCompliance, os, bQFECompliance, bWshCompliance

      dtStart = Now


    Set oArgs = WScript.Arguments

    P_OSVer = oArgs(0)
    if UCASE(TRIM(oArgs(1)))="IGNORE" Then
        P_QFEList = Split("", ",")
        P_QFEList = Split(oArgs(1),",")
    end if
    P_WSHVersion = oArgs(2)
    Set dicQFEs = CreateObject("Scripting.Dictionary")

    for I=0 to ubound(P_QFEList)
        dicQFEs.Add P_QFEList(i), false

    'Now get the info we need via WMI
    Set oWMI = GetObject("winmgmts:\\.\root\cimv2") 
    Set oWMIOS = oWMI.ExecQuery("Select Version from Win32_OperatingSystem") 
    for each os in oWMIOS
        OSVersion = os.Version
    bOSCompliance = (OSVersion >= P_OSVer)
    bWshCompliance = (WScript.Version >= P_WSHVersion or UCASE(P_WSHVersion)="IGNORE")
    Set oQFEs = oWMI.ExecQuery("Select * from Win32_QuickFixEngineering")

    for each qfe in oQFEs
    'sadly I cannot use an exact match to take into account the KB123456-v? fix naming
        if (dicQFEs.Exists(qfe.HotFixID)) Then
            dicQFEs(qfe.HotFixID) = true
    'if I have not an exact match then check for patch versioning
          keys = dicQFEs.Keys
          for I=0 to dicQFEs.count -1
            if UCASE(keys(I) & "-v") = UCASE(Left(qfe.HotFixID, Len(keys(I)&"-v"))) then
              dicQFEs(keys(I)) = true
              exit for
            end if
        end if

    'Now prepare the data to return
    Dim sMessage
        If Not bOSCompliance Then
            sMessage = sMessage & "OS is not compliant required version: " & P_OSVer & " Detected Version: " & OSVersion & vbCrLf
        end if
        If Not bWshCompliance Then
            sMessage = sMessage & "WSH is not compliant required version: " & P_WSHVersion & " Detected Version: " & WScript.Version & vbCrLf
        end if
        Set oBag = g_API.CreateTypedPropertyBag(StateDataType)
        call oBag.AddValue("OSVersion", OSVersion)
        call oBag.AddValue("OSCompliant", bOSCompliance)
        bQFECompliance = True
        for each qfe in dicQFEs.Keys
            if false = dicQFEs(qfe) Then 
                bQFECompliance = false
                sMessage = sMessage & qfe & " is missing" & vbCrLf
            end if
            call oBag.AddValue(qfe, dicQFEs(qfe))            
        call oBag.AddValue("QFECompliant", bQFECompliance)
        call oBag.AddValue("WSHCompliant", bWSHCompliance)
        call oBag.AddValue("Message", sMessage)
        'finally resturn the property bag
        g_API.AddItem oBag    
        Call g_API.ReturnItems


'**** HELPER FUNCTIONS SCOM sempre necessarie

Sub Globals
    P_TraceLevel = TRACE_VERBOSE
    Set g_API = CreateObject("MOM.ScriptAPI")
    Set g_oXML = CreateObject("MSXML.DOMDocument")  
    Set g_StdErr = WScript.StdErr
end Sub

Sub ClearGlobals
    Set g_API = Nothing
    Set g_oXML = Nothing
End Sub

– Daniele

This posting is provided "AS IS" with no warranties, and confers no rights.

  1. Using SCOM as a basic configuration audit system – Part 6 monitoring « Quae Nocent Docent
  2. Using SCOM as a basic configuration audit system – Part 5 discoveries « Quae Nocent Docent
  3. Using SCOM as a basic configuration audit system – Part 4 more types and strings « Quae Nocent Docent
  4. Using SCOM as a basic configuration audit system – Part 3 types « Quae Nocent Docent

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