Sudo

1.0.2

Public/Remove-SudoSession.ps1

                                <#

    .SYNOPSIS

        Removes an Elevated (i.e. "Run As Administrator") PSSession for the current user in the current PowerShell Session and

        and reverts any changes in WSMAN/WinRM and GPO configuration made by the companion New-SudoSession function.

        This is a companion function with New-SudoSession. If you DO NOT want to ensure that WinRM/WSMan and GPO configuration

        is as it was prior to running New-SudoSession, there is no reason to use this function. You can simply use...

            Get-PSSession | Remove-PSession

        ...like any other normal PSSession.

        If you DO want to ensure that WinRM/WSMan and GPO configuration is as it was prior to running New-SudoSession, then

        use this function with its -RevertConfig switch and -OriginalConfigInfo parameter.

    .DESCRIPTION

        Removes an Elevated (i.e. "Run As Administrator") PSSession for the current user in the current PowerShell Session and

        and reverts any changes in WSMAN/WinRM and GPO configuration made by the companion New-SudoSession function.

        This is a companion function with New-SudoSession. If you DO NOT want to ensure that WinRM/WSMan and GPO configuration

        is as it was prior to running New-SudoSession, there is no reason to use this function. You can simply use...

            Get-PSSession | Remove-PSession

        ...like any other normal PSSession.

        If you DO want to ensure that WinRM/WSMan and GPO configuration is as it was prior to running New-SudoSession, then

        use this function with its -RevertConfig switch and -OriginalConfigInfo parameter.

    .PARAMETER UserName

        This is a string that represents a UserName with Administrator privileges. Defaults to current user.

        This parameter is mandatory if you do NOT use the -Credentials parameter.

    .PARAMETER Password

        This can be either a plaintext string or a secure string that represents the password for the -UserName.

        This parameter is mandatory if you do NOT use the -Credentials parameter.

    .PARAMETER Credentials

        This is a System.Management.Automation.PSCredential object used to create an elevated PSSession.

    .PARAMETER OriginalConfigInfo

        A PSCustomObject that can be found in the "WSManAndRegistryChanges" property of the PSCustomObject generated

        by the New-SudoSession function. The "WSManAndRegistryChanges" property is itself a PSCustomObject with the

        following properties:

            [bool]WinRMStateChange

            [bool]WSMANServerCredSSPStateChange

            [bool]WSMANClientCredSSPStateChange

            [System.Collections.ArrayList]RegistryKeyCreated

            [System.Collections.ArrayList]RegistryKeyPropertiesCreated

    .PARAMETER SessionToRemove

        A System.Management.Automation.Runspaces.PSSession object that you would like to remove. You can use the 

        "ElevatedPSSession" property of the PSCustomObject generated by the New-SudoSession function, or, you can simply

        get whichever PSSession you would like to remove by doing the typical...

            Get-PSSession -Name <Name>

        This parameter accepts value from the pipeline.

    .EXAMPLE

        Get-PSSession -Name <Name>

        $ModuleToInstall = "PackageManagement"

        $LatestVersion = $(Find-Module PackageManagement).Version

        # PLEASE NOTE the use of single quotes in the below $InstallModuleExpression string

        $InstallModuleExpression = 'Install-Module -Name $ModuleToInstall -RequiredVersion $LatestVersion'

        $SudoSession = New-SudoSession -Credentials $MyCreds -Expression $InstallModuleExpression

        Remove-SudoSession -Credentials $MyCreds -OriginalConfigInfo $SudoSession.WSManAndRegistryChanges -SessionToRemove $SudoSession.ElevatedPSSession

#>

function Remove-SudoSession {

    [CmdletBinding(DefaultParameterSetName='Supply UserName and Password')]

    Param(

        [Parameter(

            Mandatory=$True,

            ValueFromPipeline=$True,

            Position=0

        )]

        [System.Management.Automation.Runspaces.PSSession]$SessionToRemove,

        [Parameter(Mandatory=$False)]

        $OriginalConfigInfo = $global:NewSessionAndOriginalStatus.WSManAndRegistryChanges

    )

    ##### BEGIN Variable/Parameter Transforms and PreRun Prep #####

    if (GetElevation) {

        Write-Error "The current PowerShell Session is already being run with elevated permissions. There is no reason to use the Start-SudoSession function. Halting!"

        $global:FunctionResult = "1"

        return

    }

    if ($OriginalConfigInfo -eq $null) {

        Write-Warning "Unable to determine the original configuration of WinRM/WSMan and AllowFreshCredentials Registry prior to using New-SudoSession. No configuration changes will be made/reverted."

        Write-Warning "The only action will be removing the Elevated PSSession specified by the -SessionToRemove parameter."

    }

    ##### END Variable/Parameter Transforms and PreRunPrep #####

    ##### BEGIN Main Body #####

    if ($OriginalConfigInfo -ne $null) {

        # Use the existing SudoSession to revert Registry/WSMAN configs so that there's no UAC prompt

        $SystemConfigSB = {

            $OriginalConfigInfo = $using:OriginalConfigInfo

            # Collect $Output as we go...

            $Output = [ordered]@{}

            if ($OriginalConfigInfo.WSMANServerCredSSPStateChange) {

                Set-Item -Path "WSMan:\localhost\Service\Auth\CredSSP" -Value false

                $Output.Add("CredSSPServer","Off")

            }

            if ($OriginalConfigInfo.WSMANClientCredSSPStateChange) {

                Set-Item -Path "WSMan:\localhost\Client\Auth\CredSSP" -Value false

                $Output.Add("CredSSPClient","Off")

            }

            if ($OriginalConfigInfo.WinRMStateChange) {

                if ([bool]$(Test-WSMan -ErrorAction SilentlyContinue)) {

                    try {

                        Disable-PSRemoting -Force -ErrorAction Stop -WarningAction SilentlyContinue

                        $Output.Add("PSRemoting","Disabled")

                        Stop-Service winrm -ErrorAction Stop

                        $Output.Add("WinRMService","Stopped")

                        Set-Item "WSMan:\localhost\Service\AllowRemoteAccess" -Value false -ErrorAction Stop

                        $Output.Add("WSMANServerAllowRemoteAccess",$False)

                    }

                    catch {

                        Write-Error $_

                        if ($Output.Count -gt 0) {[pscustomobject]$Output}

                        $global:FunctionResult = "1"

                        return

                    }

                }

            }

            if ($OriginalConfigInfo.RegistryKeyPropertiesCreated.Count -gt 0) {

                [System.Collections.ArrayList]$RegistryKeyPropertiesRemoved = @()

                foreach ($Property in $OriginalConfigInfo.RegistryKeyPropertiesCreated) {

                    $PropertyName = $($Property | Get-Member -Type NoteProperty | Where-Object {$_.Name -notmatch "PSPath|PSParentPath|PSChildName|PSDrive|PSProvider"}).Name

                    $PropertyPath = $Property.PSPath

                    if (Test-Path $PropertyPath) {

                        Remove-ItemProperty -Path $PropertyPath -Name $PropertyName

                        $null = $RegistryKeyPropertiesRemoved.Add($Property)

                    }

                }

                $Output.Add("RegistryKeyPropertiesRemoved",$RegistryKeyPropertiesRemoved)

            }

            if ($OriginalConfigInfo.RegistryKeysCreated.Count -gt 0) {

                [System.Collections.ArrayList]$RegistryKeysRemoved = @()

                foreach ($RegKey in $OriginalConfigInfo.RegistryKeysCreated) {

                    $RegPath = $RegKey.PSPath

                    if (Test-Path $RegPath) {

                        Remove-Item $RegPath -Recurse -Force

                        $null = $RegistryKeysRemoved.Add($RegKey)

                    }

                }

                $Output.Add("RegistryKeysRemoved",$RegistryKeysRemoved)

            }

            if ($Output.Count -gt 0) {

                [pscustomobject]$Output

            }

        }

        $CurrentUser = $($(whoami) -split "\\")[-1]

        $SudoSessionFolder = "$HOME\SudoSession_$CurrentUser_$(Get-Date -Format MMddyyy)"

        if (!$(Test-Path $SudoSessionFolder)) {

            $SudoSessionFolder = $(New-Item -ItemType Directory -Path $SudoSessionFolder).FullName

        }

        $SudoSessionRevertChangesPSObject = "$SudoSessionFolder\SudoSession_Config_Revert_Changes__$CurrentUser_$(Get-Date -Format MMddyyy_hhmmss).xml"

        $WSMandAndRegistryRevertChangesResult = Invoke-Command -Session $SessionToRemove -Scriptblock $SystemConfigSB

        $WSMandAndRegistryRevertChangesResult | Export-CliXml $SudoSessionRevertChangesPSObject

    }

    try {

        Remove-PSSession $SessionToRemove -ErrorAction Stop

    }

    catch {

        Write-Error $_

        $global:FunctionResult = "1"

        return

    }

    ##### END Main Body #####

}

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