SSLConfigure.ps1

# You can use the -SetCipherOrder (or -sco) option to also set the TLS cipher 
# suite order. Change the cipherorder variable below to the order you want to set on the 
# server. Setting this requires a reboot to take effect.

Param(
 [parameter(Mandatory=$false)]
 [alias("sco")]
 [switch]$SetCipherOrder)

 Function DisableRC4 {
   param ( $restart)
  $subkeys = Get-Item -Path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL"
  $ciphers = $subkeys.OpenSubKey("Ciphers", $true)

  if($ciphers.SubKeyCount -eq 0) {
    $k1 = $ciphers.CreateSubKey("RC4 128/128")
    $k1.SetValue("Enabled", 0, [Microsoft.Win32.RegistryValueKind]::DWord)
    $restart = $true
    $k2 = $ciphers.CreateSubKey("RC4 64/128")
    $k2.SetValue("Enabled", 0, [Microsoft.Win32.RegistryValueKind]::DWord)
    $k3 = $ciphers.CreateSubKey("RC4 56/128")
    $k3.SetValue("Enabled", 0, [Microsoft.Win32.RegistryValueKind]::DWord)
    $k4 = $ciphers.CreateSubKey("RC4 40/128")
    $k4.SetValue("Enabled", 0, [Microsoft.Win32.RegistryValueKind]::DWord)
  }

  $restart
}

Function Set-CryptoSetting {
  param (
    $keyindex,
    $value,
    $valuedata,
    $valuetype,
    $restart
  )

  # Check for existence of registry key, and create if it does not exist
  If (!(Test-Path -Path $regkeys[$keyindex])) {
    New-Item $regkeys[$keyindex] | Out-Null
  }

  # Get data of registry value, or null if it does not exist
  $val = (Get-ItemProperty -Path $regkeys[$keyindex] -Name $value -ErrorAction SilentlyContinue).$value

  If ($val -eq $null) {
    # Value does not exist - create and set to desired value
    New-ItemProperty -Path $regkeys[$keyindex] -Name $value -Value $valuedata -PropertyType $valuetype | Out-Null
    $restart = $True
  } Else {
    # Value does exist - if not equal to desired value, change it
    If ($val -ne $valuedata) {
      Set-ItemProperty -Path $regkeys[$keyindex] -Name $value -Value $valuedata
      $restart = $True
    }
  }

  $restart
}

$regkeys = @(
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0",
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client",
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server", #2
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1",
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client", #4
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server",
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2",        #6
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client",
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server", #8
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0",
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Client", #10
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server",
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0",        #12
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Client",
"HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server", #14
"HKLM:\SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002"
)


If ([Environment]::OSVersion.Version.Major -lt 10) {
  # This is for Windows before 10 
  Write-Host "Configuring Windows before 10..."
  $cipherorder =  "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P384,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P256,"
  $cipherorder += "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P384,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P256,"
  $cipherorder += "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256,"
  $cipherorder += "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256,"
  $cipherorder += "TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256,"
  $cipherorder += "TLS_RSA_WITH_AES_256_CBC_SHA256,TLS_RSA_WITH_AES_128_CBC_SHA256,"
  $cipherorder += "TLS_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA"
} Else {
 # this is for windows 10 or above
 Write-Host "Configuring Windows 10+..."
 $cipherorder = "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,"
 $cipherorder += "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,"
 $cipherorder += "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,"
 $cipherorder += "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,"
 $cipherorder += "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,"
 $cipherorder += "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,"
 $cipherorder += "TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256,"
 $cipherorder += "TLS_RSA_WITH_AES_256_CBC_SHA256,TLS_RSA_WITH_AES_128_CBC_SHA256,"
 $cipherorder += "TLS_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA"
}

# This is for Windows XP Embedded compatibility, remove to get securer if doesn't care.
# $cipherorder = $cipherorder + ",TLS_RSA_WITH_3DES_EDE_CBC_SHA"

# If any settings are changed, this will change to $True and the server will reboot
$reboot = $False


# Check for existence of parent registry keys (SSL 2.0 and SSL 3.0), and create if they do not exist
For ($i = 9; $i -le 12; $i = $i + 3) {
  If (!(Test-Path -Path $regkeys[$i])) {
    New-Item $regkeys[$i] | Out-Null
  }
}

# Ensure SSL 2.0 disabled for client
$reboot = Set-CryptoSetting 10 DisabledByDefault 1 DWord $reboot

# Ensure SSL 2.0 disabled for server
$reboot = Set-CryptoSetting 11 Enabled 0 DWord $reboot

# Ensure SSL 3.0 disabled for client
$reboot = Set-CryptoSetting 13 DisabledByDefault 1 DWord $reboot

# Ensure SSL 3.0 disabled for server
$reboot = Set-CryptoSetting 14 Enabled 0 DWord $reboot

# DON'T DISABLE 1.0 and 1.1 without testing your clients will be able connect to your service/other dependencies or not.
# Ensure TLS 1.0 Key exists
#If (!(Test-Path -Path $regkeys[0])) {
#	New-Item $regkeys[0] | Out-Null
#}

# Ensure TLS 1.0 disabled for client
#$reboot = Set-CryptoSetting 1 Enabled 0 DWord $reboot

# Ensure TLS 1.0 disabled for server
#$reboot = Set-CryptoSetting 2 Enabled 0 DWord $reboot

# Ensure TLS 1.1 Key exists
#If (!(Test-Path -Path $regkeys[3])) {
#    New-Item $regkeys[3] | Out-Null
#}

# Ensure TLS 1.1 disabled for client
#$reboot = Set-CryptoSetting 4 Enabled 0 DWord $reboot

# Ensure TLS 1.1 disabled for client
#$reboot = Set-CryptoSetting 5 Enabled 0 DWord $reboot

If (Test-Path -Path $regkeys[8]) {
  # Ensure TLS 1.2 enabled for server for older version of windows if the settings has been changed
  $reboot = Set-CryptoSetting 8 Enabled 1 DWord $reboot
}

$reboot = DisableRC4($reboot)

If ($SetCipherOrder) {
      If (!(Test-Path -Path $regkeys[15])) {
        New-Item $regkeys[15] | Out-Null
        $reboot = $True
      }

      $val = (Get-Item -Path $regkeys[15] -ErrorAction SilentlyContinue).GetValue("Functions", $null)
      
      if ($val -ne $cipherorder)
      {
        Write-Host "The original cipher suite order needs to be updated", `n, $val
        Set-ItemProperty -Path $regkeys[15] -Name Functions -Value $cipherorder
        $reboot = $True
      }
  }

# If any settings were changed, reboot
If ($reboot) {
  Write-Host "Rebooting now..."
  shutdown.exe /r /t 5 /c "Crypto settings changed" /f /d p:2:4
} Else {
  Write-Host "Nothing get updated."
}