AOVPNTools

1.1

Functions/Set-IKEv2VpnSecurityBaseline.ps1

                                <#

.SYNOPSIS

    Configure baseline security settings for IPsec on Windows Server Routing and Remote Access Service (RRAS) servers.

.PARAMETER EnhancedSecurity

    Configures enhanced IPsec security settings. Requires Windows Server 1803 and Windows 10 1803 or later.

.PARAMETER Reset

    Resets the VPN server's IKEv2 security settings to their default settings.

.PARAMETER Restart

    Restarts the RemoteAccess service after implementing IPsec policy changes.

.PARAMETER EnforceIKEv2CrlCheck

    Enables CRL checking for IKEv2 VPN connections.

.EXAMPLE

    Set-IKEv2VpnSecurityBaseline

    Running this command will configure minimum recommended security settings for IKEv2 VPN connections.

.EXAMPLE

    Set-IKEv2VpnSecurityBaseline -EnforceIKEv2CrlCheck

    Running this command will configure minimum recommended security settings for IKEv2 VPN connections. It will also enforce CRL checks for IKEv2 VPN connections.

.EXAMPLE

    Set-IKEv2VpnSecurityBaseline -EnhancedSecurity

    Running this command will configure enhanced security settings for IKEv2 VPN connections. Requires Windows Server 1803 or later.

.EXAMPLE

    Set-IKEv2VpnSecurityBaseline -Restart

    Running this command will configure minimum recommended security settings for IKEv2 VPN connections and restart the RemoteAccess service.

.EXAMPLE

    Set-IKEv2VpnSecurityBaseline -Reset

    Running this command will restore the default IKEv2 security settings.

.DESCRIPTION

    The default IPsec policy settings for Windows Server RRAS IKEv2 VPN connections are considered weak and should be updated. This script implements current minimum security best practices for IPsec.

.LINK

    https://directaccess.richardhicks.com/2018/12/10/always-on-vpn-ikev2-security-configuration/

.NOTES

    Version:        1.43

    Creation Date:  July 26, 2019

    Last Updated:   March 4, 2022

    Author:         Richard Hicks

    Organization:   Richard M. Hicks Consulting, Inc.

    Contact:        rich@richardhicks.com

    Web Site:       https://directaccess.richardhicks.com/

#>

Function Set-IKEv2VpnSecurityBaseline {

    [CmdletBinding(SupportsShouldProcess)]

    Param(

        [Alias('EnforceCrlCheck')]

        [switch]$EnforceIKEv2CrlCheck,

        [switch]$EnhancedSecurity,

        [switch]$Reset,

        [switch]$Restart

    )

    # // Determine OS version

    $OSVersion = Get-CimInstance 'Win32_OperatingSystem' | Select-Object -ExpandProperty Version

    Write-Verbose "OS Version is $OSVersion."

    If (([System.Version]$OSVersion -lt [System.Version]"10.0.17134") -and $EnhancedSecurity) {

        Write-Warning 'The enhanced security option is only supported on Windows Server 1803 and later.'

        Return

    }

    # // Restore default settings

    If ($Reset) {

        If ($PSCmdlet.ShouldProcess("$env:computername")) {

            Write-Verbose 'Resetting VPN server IKEv2 security parameters to their defaults...'

            Set-VpnServerConfiguration -RevertToDefault | Out-Null

        }

        If ($Restart) {

            Write-Verbose 'Restarting the RemoteAccess service...'

            Restart-Service RemoteAccess -PassThru

        }

        Else {

            Write-Warning 'The RemoteAccess service must be restarted for changes to take effect.'

        }

        Return

    }

    # // Minimum recommended security settings for IPsec VPN compatible with all supported versions of Windows Server and Client operating systems.

    # // Settings documented here: https://docs.microsoft.com/en-us/windows/client-management/mdm/vpnv2-csp

    If ($EnhancedSecurity) {

        # // Define enhanced IPsec policy settings

        $Parameters = @{

            AuthenticationTransformConstants    = 'GCMAES128'

            CipherTransformConstants            = 'GCMAES128'

            DHGroup                             = 'Group14'

            EncryptionMethod                    = 'GCMAES128'

            IntegrityCheckMethod                = 'SHA256'

            PFSgroup                            = 'ECP256'

            SALifeTimeSeconds                   = '28800'

            MMSALifeTimeSeconds                 = '86400'

            SADataSizeForRenegotiationKilobytes = '1024000'

        }

    }

    Else {

        # // Define standard IPsec policy settings

        $Parameters = @{

            AuthenticationTransformConstants    = 'SHA256128'

            CipherTransformConstants            = 'AES128'

            DHGroup                             = 'Group14'

            EncryptionMethod                    = 'AES128'

            IntegrityCheckMethod                = 'SHA256'

            PFSgroup                            = 'PFS2048'

            SALifeTimeSeconds                   = '28800'

            MMSALifeTimeSeconds                 = '86400'

            SADataSizeForRenegotiationKilobytes = '1024000'

        }

    }

    # // Implement new IPsec policy

    If ($PSCmdlet.ShouldProcess("$env:computername")) {

        Write-Verbose 'Configuring VPN server IPsec policy...'

        [PSCustomObject]$Parameters | Set-VpnServerConfiguration -CustomPolicy

    }

    If ($EnforceIKEv2CrlCheck) {

        # // Enable CRL check for IKEv2 connections

        # // Requires update KB4505658 for Windows Server 2019 and KB4503294 for Windows Server 2016

        # // Reference: https://support.microsoft.com/en-us/help/4505658/windows-10-update-kb4505658

        # // Reference: https://support.microsoft.com/en-us/help/4503294/windows-10-update-kb4503294

        $Parameters = @{

            Path         = 'HKLM:\SYSTEM\CurrentControlSet\Services\RemoteAccess\Parameters\Ikev2\'

            Name         = 'CertAuthFlags'

            PropertyType = 'DWORD'

            Value        = '4'

        }

        # // Update registry settings

        If ($PSCmdlet.ShouldProcess("$env:computername")) {

            Write-Verbose 'Enforce CRL check for IKEv2 connections...'

            New-ItemProperty @Parameters -Force | Out-Null

        }

    }

    # // Restart the RemoteAccess service or warn administrator that it must be restarted.

    If ($Restart) {

        Write-Verbose 'Restarting the RemoteAccess service...'

        Restart-Service RemoteAccess -PassThru

    }

    Else {

        Write-Warning 'The RemoteAccess service must be restarted for changes to take effect.'

    }

}

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