#Requires -Version 5.1
<#
    JbTecWiz Support Centre -- generated fix script

    Fault : 0x0000011b -- cannot connect to a shared printer after the print security updates
    Fix   : Disable the RPC hardening as a temporary measure
    Source: https://jbtecwiz.com/support/win-printnightmare-11b

    Run as     : Elevated PowerShell on the clients
    Expect     : 15 minutes
    Risk       : high
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    Only as a stopgap while the server is scheduled. This turns off a
    security mitigation -- put a date on it.

    HOW TO UNDO IT
    Remove-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Control\Print'
    -Name RpcAuthnLevelPrivacyEnabled, then restart the spooler. Do this as
    soon as the server is patched.

    This script walks the fix one step at a time and asks before each
    one. Steps with no command are things you do yourself -- it prints
    those and waits. Run with -DryRun to print without executing.

    --------------------------------------------------------------------
    NO WARRANTY - USE AT YOUR OWN RISK

    This script is provided by JbTecWiz as-is and with no warranty of any
    kind, express or implied. You run it entirely at your own risk.

    JbTecWiz accepts no liability for any loss or damage arising from its
    use, including but not limited to data loss, downtime, or configuration
    changes that turn out to be wrong for your system.

    You are responsible for reading this script before running it, for
    satisfying yourself that it suits the machine in front of you, and for
    having a working backup first. Some steps cannot be undone.
    --------------------------------------------------------------------
#>

[CmdletBinding()]
param(
    # Print every step and command without running anything.
    [switch]$DryRun,
    # Do not ask before each step. Read the script first if you use this.
    [switch]$Unattended
)

$ErrorActionPreference = 'Stop'
$script:Failed = 0

function Write-Rule { param([string]$Text)
    Write-Host ''
    Write-Host ('-' * 70) -ForegroundColor DarkGray
    if ($Text) { Write-Host $Text -ForegroundColor Cyan }
}

function Show-Prose { param([string]$Text, [string]$Colour = "Gray")
    if (-not $Text) { return }
    $words = $Text -split "\s+"; $line = "  "
    foreach ($w in $words) {
        if (($line.Length + $w.Length) -gt 74) { Write-Host $line -ForegroundColor $Colour; $line = "  " }
        $line += "$w "
    }
    if ($line.Trim()) { Write-Host $line -ForegroundColor $Colour }
}

function Invoke-Step {
    param(
        [int]$Number, [string]$Do, [string]$Why,
        [scriptblock]$Command, [switch]$Manual, [string]$Shell = "powershell"
    )
    Write-Rule "  Step $Number of 4"
    Show-Prose $Do "White"
    if ($Why) { Write-Host ""; Show-Prose $Why "DarkGray" }

    if ($Manual) {
        Write-Host ''
        Write-Host '  -> Do this yourself, then press Enter to carry on.' -ForegroundColor Yellow
        if (-not $Unattended -and -not $DryRun) { [void](Read-Host) }
        return
    }

    Write-Host ''
    foreach ($l in ($Command.ToString().Trim() -split "`n")) {
        Write-Host ("    " + $l.Trim()) -ForegroundColor Green
    }
    Write-Host ''

    if ($DryRun) { Write-Host "  (dry run -- not executed)" -ForegroundColor DarkGray; return }
    if (-not $Unattended) {
        $a = Read-Host "  Run this step? [Y]es / [S]kip / [Q]uit"
        if ($a -match "^[Qq]") { Write-Host "  Stopped at your request."; exit 0 }
        if ($a -match "^[Ss]") { Write-Host "  Skipped." -ForegroundColor DarkGray; return }
    }
    try { & $Command }
    catch {
        $script:Failed++
        Write-Host ("  Step $Number failed: " + $_.Exception.Message) -ForegroundColor Red
        Show-Prose "The rest of the fix may depend on this. Read the write-up before carrying on." "Red"
        if (-not $Unattended) {
            $c = Read-Host "  Carry on anyway? [y/N]"
            if ($c -notmatch "^[Yy]") { exit 1 }
        }
    }
}

Write-Rule
Write-Host '  0x0000011b -- cannot connect to a shared printer after the print security updates' -ForegroundColor White
Write-Host '  Disable the RPC hardening as a temporary measure' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: high   Reversible   15 minutes'
Write-Host ''
Show-Prose 'No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.' 'DarkYellow'
Write-Rule

if (-not $Unattended -and -not $DryRun) {
    $go = Read-Host '  Ready? [y/N]'
    if ($go -notmatch "^[Yy]") { Write-Host "  Nothing was changed."; exit 0 }
}

Invoke-Step -Number 1 -Do 'Understand what this does: it reverts the client to the authentication level the vulnerability was patched to prevent. It is a deliberate, temporary reduction in security.' -Why 'This registry value is widely posted as ''the fix for 0x11b''. It is not a fix; it is the mitigation being switched off.' -Manual

Invoke-Step -Number 2 -Do 'Set the value on the affected clients.' -Command {
    New-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Control\Print' -Name RpcAuthnLevelPrivacyEnabled -Value 0 -PropertyType DWord -Force
}

Invoke-Step -Number 3 -Do 'Restart the spooler.' -Command {
    Restart-Service Spooler
}

Invoke-Step -Number 4 -Do 'Record which machines you set it on, and schedule the server patch.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'The printer connects. This is a symptom being suppressed, not a fault being fixed.' 'White'

Write-Rule
if ($script:Failed -gt 0) {
    Write-Host ("  Finished with " + $script:Failed + " failed step(s).") -ForegroundColor Yellow
    Show-Prose 'Read the full write-up at https://jbtecwiz.com/support/win-printnightmare-11b' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Remove-ItemProperty -Path ''HKLM:\System\CurrentControlSet\Control\Print'' -Name RpcAuthnLevelPrivacyEnabled, then restart the spooler. Do this as soon as the server is patched.' 'DarkGray'
Write-Rule