Managing TLS 1.2 on Microsoft Entra Connect: A Comprehensive PowerShell Script for Enable, Disable, Check, and Uninstall

Here’s a PowerShell script that allows you to enable, check, disable, or uninstall TLS 1.2 on your Microsoft Entra Connect server. It prompts the user for an option and performs the corresponding action:

Get-ADSyncToolsTls12RegValue {
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory = $true, Position = 0)]
        [string]$RegPath,

        [Parameter(Mandatory = $true, Position = 1)]
        [string]$RegName
    )
    $regItem = Get-ItemProperty -Path $RegPath -Name $RegName -ErrorAction Ignore
    $output = "" | Select-Object Path, Name, Value
    $output.Path = $RegPath
    $output.Name = $RegName

    If ($regItem -eq $null) {
        $output.Value = "Not Found"
    } Else {
        $output.Value = $regItem.$RegName
    }
    $output
}

Function Check-Tls12 {
    $regSettings = @()
    $regKeys = @(
        'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319',
        'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319',
        'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server',
        'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client'
    )

    foreach ($regKey in $regKeys) {
        $regSettings += Get-ADSyncToolsTls12RegValue $regKey 'SystemDefaultTlsVersions'
        $regSettings += Get-ADSyncToolsTls12RegValue $regKey 'SchUseStrongCrypto'
        $regSettings += Get-ADSyncToolsTls12RegValue $regKey 'Enabled'
        $regSettings += Get-ADSyncToolsTls12RegValue $regKey 'DisabledByDefault'
    }

    $regSettings | Format-Table -AutoSize
}

Function Enable-Tls12 {
    Write-Host "Enabling TLS 1.2..."

    # Set TLS 1.2 registry settings
    $regKeys = @(
        'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319',
        'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319',
        'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server',
        'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client'
    )

    foreach ($regKey in $regKeys) {
        If (-Not (Test-Path $regKey)) {
            New-Item $regKey -Force | Out-Null
        }
    }

    # Set values for each key
    Set-ItemProperty -Path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319' -Name 'SystemDefaultTlsVersions' -Value 1 -Force
    Set-ItemProperty -Path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value 1 -Force
    Set-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319' -Name 'SystemDefaultTlsVersions' -Value 1 -Force
    Set-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value 1 -Force

    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -Name 'Enabled' -Value 1 -Force
    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -Name 'DisabledByDefault' -Value 0 -Force
    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -Name 'Enabled' -Value 1 -Force
    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -Name 'DisabledByDefault' -Value 0 -Force

    Write-Host "TLS 1.2 has been enabled. Please restart the server." -ForegroundColor Cyan
}

Function Disable-Tls12 {
    Write-Host "Disabling TLS 1.2..."

    # Disable TLS 1.2 registry settings
    Set-ItemProperty -Path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319' -Name 'SystemDefaultTlsVersions' -Value 0 -Force
    Set-ItemProperty -Path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value 0 -Force
    Set-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319' -Name 'SystemDefaultTlsVersions' -Value 0 -Force
    Set-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value 0 -Force

    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -Name 'Enabled' -Value 0 -Force
    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -Name 'DisabledByDefault' -Value 1 -Force
    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -Name 'Enabled' -Value 0 -Force
    Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -Name 'DisabledByDefault' -Value 1 -Force

    Write-Host "TLS 1.2 has been disabled. Please restart the server." -ForegroundColor Yellow
}

Function Uninstall-Tls12 {
    Write-Host "Uninstalling TLS 1.2 settings..."

    # Remove TLS 1.2 registry keys
    Remove-Item -Path 'HKLM:\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319' -Recurse -Force
    Remove-Item -Path 'HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319' -Recurse -Force
    Remove-Item -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -Recurse -Force
    Remove-Item -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -Recurse -Force

    Write-Host "TLS 1.2 settings have been uninstalled. Please restart the server." -ForegroundColor Red
}

# Main Menu
Function Show-Menu {
    Clear-Host
    Write-Host "TLS 1.2 Management Script"
    Write-Host "--------------------------"
    Write-Host "1. Enable TLS 1.2"
    Write-Host "2. Check TLS 1.2 status"
    Write-Host "3. Disable TLS 1.2"
    Write-Host "4. Uninstall TLS 1.2"
    Write-Host "0. Exit"
}

# Main Program Loop
Do {
    Show-Menu
    $choice = Read-Host "Please select an option (0-4)"

    Switch ($choice) {
        1 { Enable-Tls12 }
        2 { Check-Tls12 }
        3 { Disable-Tls12 }
        4 { Uninstall-Tls12 }
        0 { Write-Host "Exiting script..."; Exit }
        Default { Write-Host "Invalid option. Please select a valid option." -ForegroundColor Red }
    }
    Pause
} Until ($choice -eq 0)

How the script works:

• Enable TLS 1.2: Sets the required registry keys for TLS 1.2.

• Check TLS 1.2 Status: Checks if the registry keys for TLS 1.2 are correctly set.

• Disable TLS 1.2: Disables TLS 1.2 by modifying the relevant registry settings.

• Uninstall TLS 1.2: Deletes the registry keys related to TLS 1.2 to completely uninstall it.

Each operation requires a server restart for the changes to take effect.

Links

https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/reference-connect-tls-enforcement (https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/reference-connect-tls-enforcement)