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

    Fault : Elevation fails -- "this app has been blocked for your protection" or nothing happens
    Fix   : Find the policy doing the blocking
    Source: https://jbtecwiz.com/support/win-sec-uac-broken

    Run as     : Elevated PowerShell
    Expect     : 25 minutes
    Risk       : medium
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    "An administrator has blocked you from running this app".

    HOW TO UNDO IT
    Remove the rule from the GPO; the block returns at the next refresh.

    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 '  Elevation fails -- "this app has been blocked for your protection" or nothing happens' -ForegroundColor White
Write-Host '  Find the policy doing the blocking' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: medium   Reversible   25 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 AppLocker first -- its log names the rule and the file.' -Command {
    Get-WinEvent -LogName 'Microsoft-Windows-AppLocker/EXE and DLL' -MaxEvents 30 -ErrorAction SilentlyContinue | Format-Table TimeCreated,Id,Message -Wrap
}

Invoke-Step -Number 2 -Do 'Check Software Restriction Policies, which are older and easier to miss.' -Command {
    Get-ChildItem 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\Safer\CodeIdentifiers' -ErrorAction SilentlyContinue -Recurse | Select-Object -First 20 Name
}

Invoke-Step -Number 3 -Do 'Get the applied policy report on a domain machine rather than editing keys locally.' -Why 'The report names the GPO, so the exception is added once in the right place rather than locally on each machine, where the next policy refresh undoes it.' -Command {
    gpresult /h $env:USERPROFILE\Desktop\gpo.html /f
    Start-Process $env:USERPROFILE\Desktop\gpo.html
}

Invoke-Step -Number 4 -Do 'Add a publisher or hash rule for the specific application in the responsible GPO, in preference to a path rule, which is the weakest kind.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'The application runs and the AppLocker log shows it allowed rather than blocked.' '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-sec-uac-broken' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Remove the rule from the GPO; the block returns at the next refresh.' 'DarkGray'
Write-Rule