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

    Fault : Network printer stops printing -- 0x0000011b, 0x00000709, 0x0000007c
    Fix   : Patch both ends rather than turning the RPC protection off
    Source: https://jbtecwiz.com/support/win-net-printer-network

    Run as     : Elevated PowerShell
    Expect     : 40 minutes
    Risk       : high
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    0x0000011b. The registry workaround for this is everywhere online and it
    re-opens the vulnerability the update closed.

    HOW TO UNDO IT
    Remove the RpcAuthnLevelPrivacyEnabled value entirely to return to the
    secure default.

    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 '  Network printer stops printing -- 0x0000011b, 0x00000709, 0x0000007c' -ForegroundColor White
Write-Host '  Patch both ends rather than turning the RPC protection off' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: high   Reversible   40 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 'Check the update level of the print server and the client. A mismatch is the whole cause.' -Command {
    Get-HotFix | Sort-Object InstalledOn -Descending | Select-Object -First 8 HotFixID,Description,InstalledOn
}

Invoke-Step -Number 2 -Do 'Bring both fully up to date and restart. In the great majority of cases that is the entire fix -- the incompatibility was resolved in later cumulative updates.' -Manual

Invoke-Step -Number 3 -Do 'If a legacy device makes that impossible, understand what the workaround does before using it: RpcAuthnLevelPrivacyEnabled set to 0 reverts to unauthenticated RPC printing, which is the PrintNightmare attack path.' -Why 'This is stated plainly because the value is usually pasted in from a forum without anyone saying what it costs. If it is used, it should be a scheduled, temporary measure on an isolated print network.' -Command {
    Get-ItemProperty 'HKLM:\System\CurrentControlSet\Control\Print' -Name RpcAuthnLevelPrivacyEnabled -ErrorAction SilentlyContinue
}

Invoke-Step -Number 4 -Do 'Prefer replacing the shared-queue model with direct IP printing or Universal Print, which sidesteps the whole class of fault.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'The printer connects with the value absent or set to 1.' 'White'
Write-Host ''
if (-not $DryRun) {
    Get-Printer | Format-Table Name,DriverName,PortName,PrinterStatus
}

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-net-printer-network' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Remove the RpcAuthnLevelPrivacyEnabled value entirely to return to the secure default.' 'DarkGray'
Write-Rule