ADCSTools

1.5

Functions/Optimize-DomainControllerTlsConfiguration.ps1

                                <#

.SYNOPSIS

    This function creates a new Group Policy Object (GPO). The policy disables TLS 1.0 and 1.1 on all domain controllers where the GPO is applied. Optionally, the function can link the new GPO to the Domain Controllers OU and update the TLS cipher suites to only allow secure ciphers.

.PARAMETER GpoName

    The name of the new GPO to create. The default value is 'Domain Controller LDAPS Security Configuration'.

.PARAMETER UpdateCiphers

    Indicates that the TLS cipher suites should be updated to only allow secure ciphers.

.PARAMETER Server

    Specifies the version of Windows Server that the domain controllers are running. Valid values are '2022', '2019', and '2016'. The default value is '2022'.

.PARAMETER Link

    Indicates that the new GPO should be linked to the Domain Controllers OU.

.EXAMPLE

    Optimize-DomainControllerTlsConfiguration

    This example creates a new GPO with the default name 'Domain Controllers LDAPS Security Configuration'. The GPO disables TLS 1.0 and 1.1 on all domain controllers where the GPO is applied.

.EXAMPLE

    Optimize-DomainControllerTlsConfiguration -GpoName 'Enterprise Domain Controller TLS Optimization' -Link -UpdateCiphers

    This example creates a new GPO named 'Enterprise Domain Controller TLS Optimization', links it to the Domain Controllers OU in Active Directory, and updates the TLS cipher suites to only allow secure ciphers.

.DESCRIPTION

    When an Active Directory domain controller has a valid TLS certificate installed, TLS can be used for encrypted LDAP communcation (LDAPS). By default, domain controllers support TLS 1.0, 1.1, and 1.2. However, it is recommended to disable TLS 1.0 and 1.1 to improve security. This function creates a new Group Policy Object (GPO) in Active Directory and optionally links it to the Domain Controllers OU. The policy disables TLS 1.0 and 1.1 on all domain controllers to improve security. In addition, the function can update the TLS cipher suites to only allow secure ciphers to further improve security. Be sure to perform thorough testing before applying this policy in a production environment, as it may impact legacy applications that rely on older TLS versions.

    IMPORTANT NOTE: When updating TLS cipher suites, this function assumes all domain controllers are running the same version of Windows Server. If domain controllers are running different versions of Windows Server, create separate GPOs for each server version and use WMI filtering to ensure the correct GPO is applied to each domain controller. In addition, domain controllers must be restarted for TLS cipher suite changes to take effect.

.LINK

    https://github.com/richardhicks/adcstools/blob/main/Functions/Optimize-DomainControllerTlsConfiguration.ps1

.LINK

    https://www.richardhicks.com/

.NOTES

    Version:        1.1

    Creation Date:  March 20, 2024

    Last Updated:   March 24, 2024

    Author:         Richard Hicks

    Organization:   Richard M. Hicks Consulting, Inc.

    Contact:        rich@richardhicks.com

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

#>

Function Optimize-DomainControllerTlsConfiguration {

    [CmdletBinding()]

    Param (

        [ValidateNotNullOrEmpty()]

        [string]$GpoName = 'Domain Controller LDAPS Security Configuration',

        [switch]$UpdateCiphers,

        [Parameter(Mandatory, HelpMessage = 'Specify the version of Windows Server that the domain controllers are running.')]

        [ValidateSet('2022', '2019', '2016')]

        [string]$Server = '2022',

        [switch]$Link

    )

    # Check for existing GPO

    Write-Verbose "Checking for existing GPO named `'$GpoName`'..."

    $GpoExists = Get-Gpo -Name $GpoName -ErrorAction SilentlyContinue

    If ($GpoExists) {

        Write-Warning "A GPO named `'$GpoName`' already exists. Please specify a different name for the new GPO."

        Return

    }

    # Create new GPO in Active Directory

    Write-Verbose "Creating a new GPO named `'$GpoName`'..."

    New-Gpo -Name $GpoName -Comment 'This GPO disables TLS 1.1 and 1.0 on Domain Controllers' | Out-Null

    # Disable TLS 1.0

    Write-Verbose 'Disabling TLS 1.0...'

    $GpoParams = @{

        Name      = $GpoName

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

        ValueName = 'Enabled'

        Value     = 0

        Type      = 'DWORD'

    }

    Set-GpRegistryValue @GpoParams | Out-Null

    # Disable TLS 1.1

    Write-Verbose 'Disabling TLS 1.1...'

    $GpoParams = @{

        Name      = $GpoName

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

        ValueName = 'Enabled'

        Value     = 0

        Type      = 'DWORD'

    }

    Set-GpRegistryValue @GpoParams | Out-Null

    # Ensure TLS 1.2 is enabled (should be enabled by default)

    Write-Verbose 'Enabling TLS 1.2...'

    $GpoParams = @{

        Name      = $GpoName

        Key       = 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server'

        ValueName = 'Enabled'

        Value     = 1

        Type      = 'DWORD'

    }

    Set-GpRegistryValue @GpoParams | Out-Null

    $GpoParams = @{

        Name      = $GpoName

        Key       = 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server'

        ValueName = 'DisabledByDefault'

        Value     = 0

        Type      = 'DWORD'

    }

    Set-GpRegistryValue @GpoParams | Out-Null

    If ($UpdateCiphers) {

        # Update TLS cipher suites

        Switch -Regex ($Server) {

            '2022|2019' { $Ciphers = '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' }

            '2016' { $Ciphers = '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' }

        }

        $GpoParams = @{

            Name      = $GpoName

            Key       = 'HKLM\SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002\'

            ValueName = 'Functions'

            Type      = 'String'

            Value     = $Ciphers

        }

        Set-GpRegistryValue @GpoParams

        Write-Warning "TLS cipher suites have been updated to only allow secure ciphers. Ensure all domain controllers with this GPO applied are running Windows Server $Server."

        Write-Warning 'Domain controllers must be restarted for TLS cipher suite changes to take effect.'

    }

    If ($Link) {

        # Link the new GPO to the Domain Controllers OU

        Write-Verbose 'Linking the OU to the Domain Controllers OU...'

        $Ou = Get-ADOrganizationalUnit -Filter 'Name -eq "Domain Controllers"'

        New-GPLink -Name $GpoName -Target $Ou | Out-Null

    }

    Write-Warning 'The NTDS service must be restarted on all domain controllers for this policy to take effect.'

}

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