MSIdentityTools

1.1.4

Invoke-CommandAsSystem.ps1

                                <#

.SYNOPSIS

    Run PowerShell commands under system context.

.EXAMPLE

    PS C:\>Invoke-CommandAsSystem { [System.Security.Principal.WindowsIdentity]::GetCurrent().Name }

    Run the ScriptBlock under the system context.

.INPUTS

    System.Management.Automation.ScriptBlock

#>

function Invoke-CommandAsSystem {

    [CmdletBinding()]

    param (

        #

        [Parameter(Mandatory=$true, ValueFromPipeline=$true, Position=1)]

        [ScriptBlock] $ScriptBlock,

        #

        [Parameter(Mandatory=$false, Position=2)]

        [string[]] $ArgumentList

    )

    [guid] $GUID = New-Guid

    try {

        ## Register ScheduleJob

        if ($ArgumentList) {

            $ScheduledJob = Register-ScheduledJob -Name $GUID -ScheduledJobOption (New-ScheduledJobOption -RunElevated) -ScriptBlock $ScriptBlock -ArgumentList $ArgumentList -ErrorAction Stop

        }

        else {

            $ScheduledJob = Register-ScheduledJob -Name $GUID -ScheduledJobOption (New-ScheduledJobOption -RunElevated) -ScriptBlock $ScriptBlock -ErrorAction Stop

        }

        try {

            ## Register ScheduledTask for ScheduledJob

            $ScheduledTask = Register-ScheduledTask -TaskName $GUID -Action (New-ScheduledTaskAction -Execute $ScheduledJob.PSExecutionPath -Argument $ScheduledJob.PSExecutionArgs) -Principal (New-ScheduledTaskPrincipal -UserID 'NT AUTHORITY\SYSTEM' -LogonType ServiceAccount -RunLevel Highest) -ErrorAction Stop

            ## Execute ScheduledTask Job to Run ScheduledJob Job

            $ScheduledTask | Start-ScheduledTask -AsJob -ErrorAction Stop | Wait-Job | Remove-Job -Force -Confirm:$False

            ## Wait for ScheduledTask to finish

            While (($ScheduledTask | Get-ScheduledTaskInfo).LastTaskResult -eq 267009) {Start-Sleep -Milliseconds 150}

            ## Find ScheduledJob and get the result

            $Job = Get-Job -Name $GUID -ErrorAction SilentlyContinue | Wait-Job

            $Result = $Job | Receive-Job -Wait -AutoRemoveJob

        }

        finally {

            ## Unregister ScheduledTask for ScheduledJob

            $ScheduledTask | Unregister-ScheduledTask -Confirm:$false

        }

    }

    finally {

        ## Unregister ScheduleJob

        $ScheduledJob | Unregister-ScheduledJob -Force -Confirm:$False

    }

    return $Result

}

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# SIG # End signature block