AOVPNTools

1.8

Functions/Optimize-VpnServerTlsConfiguration.ps1

                                <#

.SYNOPSIS

    Optimize TLS configuration for SSTP VPN connections.

.PARAMETER Security

    TLS cipher suites optimized for security. AES-256 ciphers are included.

.EXAMPLE

    Optimize-VpnTlsConfiguration

    Running this command will optimize TLS configuration for performance. Cipher suites using AES-256 are not included in this configuration.

.EXAMPLE

    Optimize-VpnTlsConfiguration -Security

    Running this command will optimize TLS configuration for security. Cipher suites using AES-256 are included and preferred over AES-128 ciphers.

.DESCRIPTION

    Use this script to optimize TLS configuration to improve security and performance for SSTP VPN connections. TLS cipher suites are configured and optimized and deprecated TLS protocols are disabled.

.LINK

    https://github.com/richardhicks/aovpntools/blob/main/Functions/Optimize-VpnServerTlsConfiguration.ps1

.LINK

    https://directaccess.richardhicks.com/

.NOTES

    Version:        2.0.1

    Creation Date:  October 24, 2019

    Last Updated:   December 9, 2023

    Author:         Richard Hicks

    Organization:   Richard M. Hicks Consulting, Inc.

    Contact:        rich@richardhicks.com

    Website:        https://www.richardhicks.com/

#>

Function Optimize-VpnServerTlsConfiguration {

    [CmdletBinding()]

    Param (

        [switch]$Security

    )

    # Determine OS version

    $OSVersion = (Get-CimInstance 'Win32_OperatingSystem').Version

    Write-Verbose "Operating system version is $OSVersion."

    # Find the Windows Server OS version

    Switch -Regex ($OsVersion) {

        # Windows Server 2012/R2

        '^6.*' {

            Write-Verbose 'Detected Windows Server 2012 or 2012R2.'

            $Ciphers = 'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256';

            $CiphersSecure = 'TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P384,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P256,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P384,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P256,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P256,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256'

        }

        # Windows Server 2016

        '14393|17134' {

            Write-Verbose 'Detected Windows Server 2016 or SAC release.'

            $Ciphers = 'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256';

            $CiphersSecure = 'TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256'

        }

        # Windows Server 2019/2022

        '20348|18363|18362|17763' {

            Write-Verbose 'Detected Windows Server 2019, 2022, or SAC release.'

            $Ciphers = 'TLS_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256';

            $CiphersSecure = 'TLS_AES_256_GCM_SHA384,TLS_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256'

        }

        # Default

        Default { $Unknown = $True }

    }

    If ($Unknown) {

        Write-Warning 'Error identifying operating system version.'

        Return

    }

    # Set cipher suite order

    If ($Security) {

        Write-Verbose 'Using security optimized TLS configuration.'

        $CipherSuiteOrder = $CiphersSecure

    }

    Else {

        Write-Verbose 'Using performance optimized TLS configuration.'

        $CipherSuiteOrder = $Ciphers

    }

    # Use transaction for registry updates

    Write-Verbose 'Starting registry transaction...'

    Start-Transaction

    # Define registry parameters

    $Parameters = @{

        Path           = 'HKLM:\SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002\'

        Name           = 'Functions'

        PropertyType   = 'String'

        Value          = $CipherSuiteOrder

        UseTransaction = $True

    }

    # Update registry settings

    Write-Verbose 'Updating TLS cipher suite configuration...'

    New-ItemProperty @Parameters -Force | Out-Null

    # Disable SSL 3.0

    Write-Verbose 'Disabling SSL 3.0...'

    # Create registry key

    New-Item -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server\' -Force | Out-Null

    # Define registry parameters

    $Parameters = @{

        Path           = 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server\'

        Name           = 'Enabled'

        PropertyType   = 'DWORD'

        Value          = '0'

        UseTransaction = $True

    }

    # Update registry settings

    New-ItemProperty @Parameters -Force | Out-Null

    # Disable TLS 1.0

    Write-Verbose 'Disabling TLS 1.0...'

    # Create registry key

    New-Item -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server\' -Force | Out-Null

    # Define registry parameters

    $Parameters = @{

        Path           = 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server\'

        Name           = 'Enabled'

        PropertyType   = 'DWORD'

        Value          = '0'

        UseTransaction = $True

    }

    # Update registry settings

    New-ItemProperty @Parameters -Force | Out-Null

    # Disable TLS 1.1

    Write-Verbose 'Disabling TLS 1.1...'

    # Create registry key

    New-Item -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server\' -Force | Out-Null

    # Define registry parameters

    $Parameters = @{

        Path           = 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server\'

        Name           = 'Enabled'

        PropertyType   = 'DWORD'

        Value          = '0'

        UseTransaction = $True

    }

    # Update registry settings

    New-ItemProperty @Parameters -Force | Out-Null

    # Complete transaction

    Write-Verbose 'Committing registry transaction...'

    Complete-Transaction

    Write-Warning 'The server must be restarted for these changes to take effect. After restart, validate TLS configuration at https://ssllabs.com/ssltest/.'

}

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