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://github.com/richardhicks/aovpntools/blob/main/Functions/Set-IKEv2VpnSecurityBaseline.ps1
 
.LINK
    https://directaccess.richardhicks.com/2018/12/10/always-on-vpn-ikev2-security-configuration/
 
.LINK
    https://directaccess.richardhicks.com/
 
.NOTES
    Version: 1.4.8
    Creation Date: July 26, 2019
    Last Updated: March 13, 2024
    Author: Richard Hicks
    Organization: Richard M. Hicks Consulting, Inc.
    Contact: rich@richardhicks.com
    Website: https://www.richardhicks.com/
 
#>


#Requires -Modules RemoteAccess
#Requires -RunAsAdministrator

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 -Name 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 -Name RemoteAccess -PassThru

    }

    Else {

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

    }

}

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