Question

Grant Standard User Elevated Privelages

Asked by: LFMSupport

Hi everyone!

On our network we have some logon scripts that set certain registry values and run certain commands on each machine. In order to get these to work each user has to be setup as a local administrator on that machine.

The problem is that having each user as a local admin allows them unrestricted access to install applications and all kinds of other stuff.

What I would like to know is if it is possible to setup the users as standard users but give them the elevated privelages to allow the changes made by the login scripts!?

Does that make sense!?

Danny

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Asked On
2005-01-06 at 05:18:27ID21263888
Topic

Windows Network Security

Participating Experts
2
Points
400
Comments
15

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Answers

 

by: NJComputerNetworksPosted on 2005-01-06 at 06:20:14ID: 12972144

You can try to use a GPO to modify the registry rather then a logon script.

http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/management/gp/admtgp.mspx

 

by: NJComputerNetworksPosted on 2005-01-06 at 06:23:01ID: 12972165

 

by: LFMSupportPosted on 2005-01-06 at 07:03:04ID: 12972578

Thanks for the links, unfortunatley we aren't running Active Directory so a Group Policy solution won't work.

Danny

 

by: richrumblePosted on 2005-01-06 at 07:09:25ID: 12972641

Try using something like: http://www.microsoft.com/technet/scriptcenter/resources/qanda/dec04/hey1213.mspx the drawback to this, is that an admin password has to be hardcoded into the script. Most users will not know where to look for your scripts, let alone actually look through them- but it's one way to acomplish the task. But you may also try to employ the script encoder: http://www.microsoft.com/downloads/details.aspx?FamilyId=E7877F67-C447-4873-B1B0-21F0626A6329&displaylang=en as it will encode WSH/VbScript (which is wmi and ADSI scripts) http://msdn.microsoft.com/library/default.asp?url=/library/en-us/script56/html/seusingscriptencoder.asp
-rich




 

by: LFMSupportPosted on 2005-01-06 at 07:32:21ID: 12972880

Rich,

That looks to be pretty much what I am after except that the logon scripts will be run on the local computer. Do I simply need to set the computer name variable to "." so the script connects to the local machine?

Danny

 

by: richrumblePosted on 2005-01-06 at 08:05:48ID: 12973320

Also, since it's not well documented anywhere in the encoder, or on MS's site (from my breif serach) here is a fine example of what to do:
.vbe tells the os that the VBS script has been encoded (remember encoded, is not encrypted, it's not a great form of security- but it's better than plain-text)

to run an encoded vbs file:
cscript encoded-file.vbe

below is "encoded-file.vbs"  (a simple VBscript to show what user is running winword process)

strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")

Set colProcessList = objWMIService.ExecQuery _
    ("Select * from Win32_Process Where Name = 'Winword.exe'")

For Each objProcess in colProcessList
    objProcess.GetOwner strUserName, strUserDomain
    Wscript.Echo "Process " & objProcess.Name & " is owned by " _
        & strUserDomain & "\" & strUserName & "."
Next

and to encrypt it type:
screnc /l vbscript encoded-file.vbs encoded-file.vbe

open word, and run the encrypted script
cscript encoded-file.vbe

should return:
Process WINWORD.EXE is owned by domainX\userX
(domainX and userX will be the person running winword)

-rich

 

by: richrumblePosted on 2005-01-06 at 08:11:32ID: 12973399

hmm... from the documentation on the page they state"One important note: this approach, in which you run a script under alternate credentials, works only on remote machines. For some reason, WMI won't let you run a script under alternate credentials on your own computer. Go figure."
But the ADSI seems to be better for this "By the way, OpenDSObject also works with local user accounts; the primary difference is that you bind to WinNT provider instead of the LDAP provider"

here is another runas script I've used:
'Start of Script
'VBRUNAS.VBS
'v1.2 March 2001
'Jeffery Hicks
'jhicks@quilogy.com http://www.quilogy.com
'USAGE: cscript|wscript VBRUNAS.VBS Username Password Command
'DESC: A RUNAS replacement to take password at a command prompt.
'NOTES: This is meant to be used for local access. If you want to run a command 'across the network as another user, you must add the /NETONLY switch to the RUNAS 'command.

' *********************************************************************************
' * THIS PROGRAM IS OFFERED AS IS AND MAY BE FREELY MODIFIED OR ALTERED AS * ' * NECESSARY TO MEET YOUR NEEDS. THE AUTHOR MAKES NO GUARANTEES OR WARRANTIES, * ' * EXPRESS, IMPLIED OR OF ANY OTHER KIND TO THIS CODE OR ANY USER MODIFICATIONS. * ' * DO NOT USE IN A PRODUCTION ENVIRONMENT UNTIL YOU HAVE TESTED IN A SECURED LAB * ' * ENVIRONMENT. USE AT YOUR OWN RISK. * ' *********************************************************************************

On Error Resume Next
dim WshShell,oArgs,FSO

set oArgs=wscript.Arguments

if InStr(oArgs(0),"?")<>0 then
wscript.echo VBCRLF & "? HELP ?" & VBCRLF Usage end if

if oArgs.Count <3 then
wscript.echo VBCRLF & "! Usage Error !" & VBCRLF Usage end if

sUser=oArgs(0)
sPass=oArgs(1)&VBCRLF
sCmd=oArgs(2)

set WshShell = CreateObject("WScript.Shell") set WshEnv = WshShell.Environment("Process") WinPath = WshEnv("SystemRoot")&"\System32\runas.exe"
set FSO = CreateObject("Scripting.FileSystemObject")

if FSO.FileExists(winpath) then
'wscript.echo winpath & " " & "verified"
else
wscript.echo "!! ERROR !!" & VBCRLF & "Can't find or verify " & winpath &"." & VBCRLF & "You must be running Windows 2000 for this script to work."
set WshShell=Nothing
set WshEnv=Nothing
set oArgs=Nothing
set FSO=Nothing
wscript.quit
end if

rc=WshShell.Run("runas /user:" & sUser & " " & CHR(34) & sCmd & CHR(34), 2, FALSE) Wscript.Sleep 30 'need to give time for window to open.
WshShell.AppActivate(WinPath) 'make sure we grab the right window to send password to WshShell.SendKeys sPass 'send the password to the waiting window.

set WshShell=Nothing
set oArgs=Nothing
set WshEnv=Nothing
set FSO=Nothing

wscript.quit

'************************
'* Usage Subroutine *
'************************
Sub Usage()
On Error Resume Next
msg="Usage: cscript|wscript vbrunas.vbs Username Password Command" & VBCRLF & VBCRLF & "You should use the full path where necessary and put long file names or commands" & VBCRLF & "with parameters in quotes" & VBCRLF & VBCRLF &"For example:" & VBCRLF &" cscript vbrunas.vbs quilogy\jhicks luckydog e:\scripts\admin.vbs" & VBCRLF & VBCRLF &" cscript vbrunas.vbs quilogy\jhicks luckydog " & CHR(34) &"e:\program files\scripts\admin.vbs 1stParameter 2ndParameter" & CHR(34)& VBCRLF & VBCRLF & VBCLRF & "cscript vbrunas.vbs /?|-? will display this message."

wscript.echo msg

wscript.quit

end sub
'End of Script


I've not modified it look for the password in the script... i'll work on it see if I can get it done. But if you use the first example, and put in a user/pass for an account that has Admin priv's on a machine, your reg files should work also... give it a try
-rich

 

by: LFMSupportPosted on 2005-01-06 at 08:27:05ID: 12973656

Rich, that looks like it will be pretty much exactly what I need.

When you say try the first script I take it you mean the one below giving strUsername and strUserDomain a proper value?

strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")

Set colProcessList = objWMIService.ExecQuery _
    ("Select * from Win32_Process Where Name = 'Winword.exe'")

For Each objProcess in colProcessList
    objProcess.GetOwner strUserName, strUserDomain
    Wscript.Echo "Process " & objProcess.Name & " is owned by " _
        & strUserDomain & "\" & strUserName & "."
Next

Cheers,
Danny

 

by: richrumblePosted on 2005-01-06 at 08:34:52ID: 12973784

yes. Try using a user/pass that has admin rights on the machine (not necessarily a local machine account) But you may even try a local one just to doubel check...
-rich

 

by: LFMSupportPosted on 2005-01-06 at 08:38:33ID: 12973830

Cool,

Based on the second script you posted I'm pretty confident I could get something working.

Thanks very much for your time!

Danny

 

by: richrumblePosted on 2005-01-14 at 07:33:47ID: 13044905

Here is one I got going today... it uses Runas itself, and then uses sendkeys to send the password to runas... works well on local pc's

Option explicit
dim oShell
set oShell= Wscript.CreateObject("WScript.Shell")
' Replace the path with the program you wish to run c:\ etc...
oShell.Run "runas /noprofile /user:administrator ""C:\Program Files\Microsoft Office\OFFICE11\WINWORD.EXE"""
WScript.Sleep 100
'Replace the string yourpassword~ below with
'the password used on your system. Include tilde
oShell.Sendkeys "yourpassword~"
Wscript.Quit

Work's very well.
-rich

 

by: LFMSupportPosted on 2005-01-14 at 07:59:04ID: 13045204

I'll give this a go. If it works it looks to be a lot less work than the answer I accepted.

Cheers!
Danny

 

by: richrumblePosted on 2005-01-14 at 08:08:01ID: 13045313

I definatly like this a bit better, and encoded will help some also

screnc.exe /l vbscript  c:\runas.vbs c:\runas.vbe

All you have to do is double click on the vbe file, or use a batch file to call it (using cscript /nologo c:\runas.vbe)
-rich

 

by: LFMSupportPosted on 2005-01-14 at 08:12:52ID: 13045384

cheers for that.

Also, thanks for posting after the answer was accepted that's pretty good of you! :0)

Danny

 

by: richrumblePosted on 2005-01-14 at 08:17:06ID: 13045438

I'm the best! And modest too ;p I've been looking for this kind of thing for a long time- and I am happy to share!
-rich

20120131-EE-VQP-002

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