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Streamline Your VPN Configuration: Set Up a VPN with PowerShell

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Key Takeaways

  • Automated VPN Setup: The script automates the creation of VPN connections in Windows, enhancing efficiency.
  • Supports Various VPN Types: Compatible with L2TP, SSTP, IKEV2, and automatic selection of VPN types.
  • Flexibility in Configuration: Can pull VPN settings from Ninja Documentation or custom fields for tailored setups.
  • Enhanced Security: Standardizes VPN configurations across devices, reducing the risk of misconfigurations.
  • Shortcut and Icon Management: Automatically creates desktop shortcuts and manages VPN shortcut icons.
  • Windows Registry Modifications: Adjusts settings like UDP encapsulation in the Windows registry for specific VPN needs.
  • Overwrite Capability: Offers the option to overwrite existing VPN connections with the same name.
  • Test Before Widespread Use: Advised to test the script in a controlled environment before broad application.
  • Regular Updates Required: Necessary to update the script for compatibility with the latest VPN standards and Windows updates.
  • Secure Script Management: Important to store the script and its credentials securely to avoid unauthorized access.
  • NinjaOne Integration: The script complements NinjaOne’s platform, streamlining VPN management in IT infrastructures.

The integration of Virtual Private Networks (VPNs) in corporate and IT settings is essential for maintaining secure and remote access to organizational resources. As businesses increasingly adopt remote work policies and cloud-based services, the ability to swiftly and securely set up VPN connections becomes crucial. In this light, automation scripts for VPN setup play a pivotal role.

Background

The provided PowerShell script is designed to automate the process of setting up a VPN connection in Windows environments. It caters to IT professionals and Managed Service Providers (MSPs) who regularly configure VPNs across numerous devices. This script not only saves time but also ensures consistency and reduces the likelihood of manual errors in VPN configurations.

The Script:

#Requires -Version 5.1

<#
.SYNOPSIS
    Creates a VPN using the built-in Windows VPN client, with configuration options from Ninja Documentation or Device Custom Fields.
.DESCRIPTION
    This script will create a VPN using the built-in Windows VPN client. It will not create PPTP or "No Encryption" VPNs. 
    It can pull all the necessary VPN information from a Ninja Document or custom field you specify. 
    You can override the Documentation fields with parameters or only use parameters if you would like.

    For more information on Ninja Documentation: https://ninjarmm.zendesk.com/hc/en-us/articles/360061218431-Documentation

OPTIONAL: Custom Fields - All Fields must be readable by scripts
    # Name # - # Field Type and what values to use for dropdowns. #
    vpnName - text field
    vpnHost - text field
    presharedKey - Secure field (if using device custom fields) or text field.
    tunnelType - dropdown field. Acceptable values are L2TP, SSTP, IKEV2, Automatic
    authMethod - multi-select field. Acceptable values are PAP, Chap, MSChapv2, MachineCertificate
    encryptionLevel - dropdown field. Acceptable values are Optional, Required, Maximum
    dnsSuffix - text field
    rememberCreds - Checkbox
    useWinCredentials - Checkbox
    assumeUdpEncapsulation - Checkbox
    splitTunneling - Checkbox
    createVpnShortcut - Checkbox
    shortcutUrl - URL or Text
    shortcutIconDirectory - Text

PARAMETER: -DocumentName "ReplaceWithNameOfyourNinjaDocument"
    Replace the value in quotes with the document you'd like to retireve the vpn parameters from (if any).

PARAMETER: -Name "Contoso VPN"
    The name of the VPN you would like to create

PARAMETER: -Server "replace.me"
    The endpoint/server the VPN will try to establish a connection with.

PARAMETER: -PreSharedKey "ReplaceWithPreSharedKey"
    The Pre-Shared Key for the VPN.

PARAMETER: -TunnelType "L2TP"
    The Type of VPN ex. L2TP, SSTP, IKEV2, Automatic

PARAMETER: -AuthMethod "PAP,CHAP"
    The authentication methods supported by the VPN separated by commas.

PARAMETER: -EncryptionLevel "Required"
    The Encryption level used by the VPN.

PARAMETER: -DNSSuffix "contoso.local"
    The DNS Suffix used by the connection.

PARAMETER: -RememberCreds
    Whether or not the VPN should remember the previously used credentials for future connections.

PARAMETER: -UseWinlogonCredential
    Whether or not the VPN should use the Windows logon credentials for authentication.

PARAMETER: -AssumeUDPEncapsulation
    Sets the AssumeUDPEncapsulation registry key which is required by many VPNs
.LINK
    https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/configure-l2tp-ipsec-server-behind-nat-t-device

PARAMETER: -SplitTunneling
    Enables split tunneling.

PARAMETER: -CreateShortcut
    Creates a desktop shortcut for accessing the VPN.

PARAMETER: -URL
   A URL to an image you'd like to download and use for the shortcut icon. Icon will be stored at -IconDirectory.

PARAMETER: -IconDirectory "C:\ReplaceMe"
    The directory where the shortcut's icon file will be stored.

PRESET PARAMETER: -SkipSleep
    By default the script sleeps for a random interval between 3 and 60 seconds prior to downloading an icon (if the script is given a url). This parameter skips the sleep.

PARAMETER: -Overwrite
    Overwrites an existing VPN with the same name, if present.
.OUTPUTS
    None
.NOTES
    Minimum Supported OS: Windows 10
    Release Notes: Script renamed, Script Variable support enhanced, improved icon handling.
By using this script, you indicate your acceptance of the following legal terms as well as our Terms of Use at https://www.ninjaone.com/terms-of-use.
    Ownership Rights: NinjaOne owns and will continue to own all right, title, and interest in and to the script (including the copyright). NinjaOne is giving you a limited license to use the script in accordance with these legal terms. 
    Use Limitation: You may only use the script for your legitimate personal or internal business purposes, and you may not share the script with another party. 
    Republication Prohibition: Under no circumstances are you permitted to re-publish the script in any script library or website belonging to or under the control of any other software provider. 
    Warranty Disclaimer: The script is provided “as is” and “as available”, without warranty of any kind. NinjaOne makes no promise or guarantee that the script will be free from defects or that it will meet your specific needs or expectations. 
    Assumption of Risk: Your use of the script is at your own risk. You acknowledge that there are certain inherent risks in using the script, and you understand and assume each of those risks. 
    Waiver and Release: You will not hold NinjaOne responsible for any adverse or unintended consequences resulting from your use of the script, and you waive any legal or equitable rights or remedies you may have against NinjaOne relating to your use of the script. 
    EULA: If you are a NinjaOne customer, your use of the script is subject to the End User License Agreement applicable to you (EULA).
#>

[CmdletBinding()]
param (
    [Parameter()]
    [String]$DocumentName,
    [Parameter()]
    [String]$Name,
    [Parameter()]
    [String]$NameField = "vpnName",
    [Parameter()]
    [String]$Server,
    [Parameter()]
    [String]$ServerField = "vpnHost",
    [Parameter()]
    [String]$PreSharedKey,
    [Parameter()]
    [String]$PreSharedKeyField = "presharedKey",
    [Parameter()]
    [String]$TunnelType = "Automatic",
    [Parameter()]
    [String]$TunnelTypeField = "tunnelType",
    [Parameter()]
    [String[]]$AuthMethod,
    [Parameter()]
    [String]$AuthMethodField = "authMethod",
    [Parameter()]
    [String]$EncryptionLevel,
    [Parameter()]
    [String]$EncryptionLevelField = "encryptionLevel",
    [Parameter()]
    [String]$DNSSuffix,
    [Parameter()]
    [String]$DNSSuffixField = "dnsSuffix",
    [Parameter()]
    [Switch]$RememberCreds = [System.Convert]::ToBoolean($env:rememberUserCredentials),
    [Parameter()]
    [String]$RememberCredsField = "rememberCreds",
    [Parameter()]
    [Switch]$UseWinlogonCredential = [System.Convert]::ToBoolean($env:useWindowsCredentials),
    [Parameter()]
    [String]$UseWinlogonCredsField = "useWinCredentials",
    [Parameter()]
    [Switch]$AssumeUDPencapsulation = [System.Convert]::ToBoolean($env:assumeUdpEncapsulation),
    [Parameter()]
    [String]$UDPField = "assumeUdpEncapsulation",
    [Parameter()]
    [Switch]$SplitTunneling = [System.Convert]::ToBoolean($env:splitTunneling),
    [Parameter()]
    [String]$SplitTunnelingField = "splitTunneling",
    [Parameter()]
    [Switch]$CreateShortcut = [System.Convert]::ToBoolean($env:createVpnDesktopShortcut),
    [Parameter()]
    [String]$ShortcutField = "createVpnShortcut",
    [Parameter()]
    [String]$Url,
    [Parameter()]
    [String]$UrlField = "shortcutUrl",
    [Parameter()]
    [String]$IconDirectory,
    [Parameter()]
    [String]$IconDirectoryField = "shortcutIconDirectory",
    [Parameter()]
    [Switch]$Overwrite = [System.Convert]::ToBoolean($env:overwrite),
    [Parameter()]
    [Switch]$SkipSleep
)
begin {
    Add-Type -AssemblyName System.Drawing

    if ([System.Convert]::ToBoolean($env:verboseOutput)) {
        $VerbosePreference = 'Continue'
    }

    # You can replace the line below with $IconBase64 = 'ReplaceThisWithYourBase64EncodedImageEncasedInQuotes', and the script will decode the image and use it for the VPN shortcut.
    $IconBase64 = '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'
    function Test-IsSystem {
        $id = [System.Security.Principal.WindowsIdentity]::GetCurrent()
        return $id.Name -like "NT AUTHORITY*" -or $id.IsSystem
    }

    function Test-IsElevated {
        $id = [System.Security.Principal.WindowsIdentity]::GetCurrent()
        $p = New-Object System.Security.Principal.WindowsPrincipal($id)
        $p.IsInRole([System.Security.Principal.WindowsBuiltInRole]::Administrator)
    }

    function ConvertFrom-Base64 {
        param(
            $Base64,
            $Path
        )
        $bytes = [Convert]::FromBase64String($Base64)

        # This section of code will error out when run multiple times in the same session. This is due to something holding onto the file after closing. 
        # The file is unlocked when the PowerShell session is closed.
        $ErrorActionPreference = [System.Management.Automation.ActionPreference]::SilentlyContinue
        [IO.File]::WriteAllBytes($Path, $bytes)
        $ErrorActionPreference = [System.Management.Automation.ActionPreference]::Continue
    }

    # There are many ways to create icon files. The method below creates a PNG and then creates an ICO file in binary form by creating the header and adding the PNG's binary at the bottom.
    # Once this has been done, we can simply write all the bytes to our new file.
    function ConvertFrom-Image {
        param(
            $ImagePath,
            $Path
        )

        # Grab an instance of the image and a blank bitmap
        $image = [Drawing.Image]::FromFile($ImagePath)

        # If you want transparency, you'll need an Alpha channel in the pixel format
        $bitmap = New-Object System.Drawing.Bitmap (255, 255, [system.drawing.imaging.PixelFormat]::Format32bppArgb)
        $bitmap.SetResolution(255, 255)

        # Create a graphics object which will be used to resize the image to 255px by 255px
        $graphics = [System.Drawing.Graphics]::FromImage($bitmap)

        # Set some quality settings for the resize operation
        $graphics.SmoothingMode = [System.Drawing.Drawing2D.SmoothingMode]::HighQuality
        $graphics.InterpolationMode = [System.Drawing.Drawing2D.InterpolationMode]::HighQualityBicubic
        $graphics.PixelOffsetMode = [System.Drawing.Drawing2D.PixelOffsetMode]::HighQuality

        # Draw the image onto the bitmap
        $graphics.DrawImage($Image, 0, 0, 255, 255)
        
        # Temporarily save the image as a PNG
        $RandomNumber = Get-Random -Maximum 1000000
        $bitmap.Save("$env:TEMP\image-$RandomNumber.png", [System.Drawing.Imaging.ImageFormat]::Png)
        $png = "$env:TEMP\image-$RandomNumber.png"

        # Begin building the ICO file in binary using the PNG file (ICO files are comprised of PNG(s))
        if ($PSVersionTable.PSVersion.Major -gt 5) {
            $pngBytes = Get-Content -Path $png -AsByteStream
        }
        else {
            $pngBytes = Get-Content -Path $png -Encoding Byte -Raw
        }
        $icoHeader = [byte[]] @(0, 0, 1, 0, 1, 0)
        $imageDataSize = $pngBytes.Length
        $icoDirectory = [byte[]] @(
            255, 255, # icon size
            0, 0, # color count
            0, 0, # reserved
            0, 0, # hotspot x, hotspot y
            ($imageDataSize -band 0xFF),
            (($imageDataSize -shr 8) -band 0xFF),
            (($imageDataSize -shr 16) -band 0xFF),
            (($imageDataSize -shr 24) -band 0xFF),
            22, 0, 0, 0  # offset to image data
        )
        $iconData = $icoHeader + $icoDirectory + $pngBytes

        # Once complete, save the icon file
        if (Test-Path $Path -ErrorAction SilentlyContinue) { Remove-Item $Path -Force }
        [System.IO.File]::WriteAllBytes($Path, $iconData)

        # Close out of everything and remove the temporary file
        if (Test-Path $png -ErrorAction SilentlyContinue) { Remove-Item $png -Force }
        $bitmap.Dispose()
        $image.Dispose()
        $graphics.Dispose()
        [System.GC]::Collect()

        # Refresh the icon cache
        if ([System.Environment]::OSVersion.Version.Major -ge 10) {
            Invoke-Command { ie4uinit.exe -show }
        }
        else {
            Invoke-Command { ie4uinit.exe -ClearIconCache }
        }
    }

    # Utility function for downloading files.
    function Invoke-Download {
        param(
            [Parameter()]
            [String]$URL,
            [Parameter()]
            [String]$Path,
            [Parameter()]
            [int]$Attempts = 3,
            [Parameter()]
            [Switch]$SkipSleep
        )
        Write-Host "URL given, downloading the file..."

        $SupportedTLSversions = [enum]::GetValues('Net.SecurityProtocolType')
        if ( ($SupportedTLSversions -contains 'Tls13') -and ($SupportedTLSversions -contains 'Tls12') ) {
            [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol::Tls13 -bor [System.Net.SecurityProtocolType]::Tls12
        }
        elseif ( $SupportedTLSversions -contains 'Tls12' ) {
            [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12
        }
        else {
            # Not everything requires TLS 1.2, but we'll try anyways.
            Write-Warning "TLS 1.2 and or TLS 1.3 isn't supported on this system. This download may fail!"
            if ($PSVersionTable.PSVersion.Major -lt 3) {
                Write-Warning "PowerShell 2 / .NET 2.0 doesn't support TLS 1.2."
            }
        }

        $i = 1
        While ($i -le $Attempts) {
            # Some cloud services have rate limiting.
            if (-not ($SkipSleep)) {
                $SleepTime = Get-Random -Minimum 3 -Maximum 15
                Write-Host "Waiting for $SleepTime seconds."
                Start-Sleep -Seconds $SleepTime
            }
            if ($i -ne 1) { Write-Host "" }
            Write-Host "Download Attempt $i"

            try {
                # Invoke-WebRequest is preferred because it supports links that redirect, e.g., https://t.ly.
                if ($PSVersionTable.PSVersion.Major -lt 4) {
                    # Downloads the file
                    $WebClient = New-Object System.Net.WebClient
                    $WebClient.DownloadFile($URL, $Path)
                }
                else {
                    # Standard options for Invoke-WebRequest.
                    $WebRequestArgs = @{
                        Uri                = $URL
                        OutFile            = $Path
                        MaximumRedirection = 10
                        UseBasicParsing    = $true
                    }

                    # Downloads the file
                    Invoke-WebRequest @WebRequestArgs
                }

                $File = Test-Path -Path $Path -ErrorAction SilentlyContinue
            }
            catch {
                Write-Warning "An error has occurred while downloading!"
                Write-Warning $_.Exception.Message

                if (Test-Path -Path $Path -ErrorAction SilentlyContinue) {
                    Remove-Item $Path -Force -Confirm:$false -ErrorAction SilentlyContinue
                }

                $File = $False
            }

            if ($File) {
                $i = $Attempts
            }
            else {
                Write-Warning "File failed to download."
                Write-Host ""
            }

            $i++
        }

        if (-not (Test-Path $Path)) {
            Write-Warning "Failed to download file!"
        }
        else {
            return $Path
        }
    }

    # Used for creating desktop shortcuts.
    function New-Shortcut {
        [CmdletBinding()]
        param(
            [Parameter()]
            [String]$Arguments,
            [Parameter()]
            [String]$IconPath,
            [Parameter(ValueFromPipeline)]
            [String]$Path,
            [Parameter()]
            [String]$Target,
            [Parameter()]
            [String]$WorkingDir
        )
        process {
            Write-Host "Creating shortcut at $Path"
            $ShellObject = New-Object -ComObject ("WScript.Shell")
            $Shortcut = $ShellObject.CreateShortcut($Path)
            $Shortcut.TargetPath = $Target
            if ($WorkingDir) { $Shortcut.WorkingDirectory = $WorkingDir }
            if ($Arguments) { $ShortCut.Arguments = $Arguments }
            if ($IconPath) { $Shortcut.IconLocation = $IconPath }
            $Shortcut.Save()

            if (-not(Test-Path $Path -ErrorAction Ignore)) {
                Write-Error "Unable to create shortcut at $Path"
                exit 1
            }
        }
    }

    function Set-HKProperty {
        param (
            $Path,
            $Name,
            $Value,
            [ValidateSet('DWord', 'QWord', 'String', 'ExpandedString', 'Binary', 'MultiString', 'Unknown')]
            $PropertyType = 'DWord'
        )
        if (-not $(Test-Path -Path $Path)) {
            # Check if the path does not exist and create the path.
            New-Item -Path $Path -Force | Out-Null
        }
        if ((Get-ItemProperty -Path $Path -Name $Name -ErrorAction Ignore)) {
            # Update the property and print out what it was changed from and what it was changed to.
            $CurrentValue = (Get-ItemProperty -Path $Path -Name $Name -ErrorAction Ignore).$Name
            try {
                Set-ItemProperty -Path $Path -Name $Name -Value $Value -Force -Confirm:$false -ErrorAction Stop | Out-Null
            }
            catch {
                Write-Error "[Error] Unable to Set registry key for $Name; please see below error!"
                Write-Error $_
                exit 1
            }
            Write-Host "$Path\$Name changed from $CurrentValue to $($(Get-ItemProperty -Path $Path -Name $Name -ErrorAction Ignore).$Name)"
        }
        else {
            # Create the property with a value.
            try {
                New-ItemProperty -Path $Path -Name $Name -Value $Value -PropertyType $PropertyType -Force -Confirm:$false -ErrorAction Stop | Out-Null
            }
            catch {
                Write-Error "[Error] Unable to Set registry key for $Name please see below error!"
                Write-Error $_
                exit 1
            }
            Write-Host "Set $Path\$Name to $($(Get-ItemProperty -Path $Path -Name $Name -ErrorAction Ignore).$Name)"
        }
    }

    # This function is to make it easier to parse Ninja Custom Fields.
    function Get-NinjaProperty {
        [CmdletBinding()]
        Param(
            [Parameter(Mandatory = $True, ValueFromPipeline = $True)]
            [String]$Name,
            [Parameter()]
            [String]$Type,
            [Parameter()]
            [String]$DocumentName
        )

        # If we're requested to get the field value from a Ninja document, we'll specify it here.
        $DocumentationParams = @{}
        if ($DocumentName) { $DocumentationParams["DocumentName"] = $DocumentName }

        # These two types require more information to parse.
        $NeedsOptions = "DropDown", "MultiSelect"

        # Grabbing document values requires a slightly different command.
        if ($DocumentName) {
            # Secure fields are only readable when they're a device custom field
            if ($Type -Like "Secure") { throw "$Type is an invalid type! Please check here for valid types. https://ninjarmm.zendesk.com/hc/en-us/articles/16973443979789-Command-Line-Interface-CLI-Supported-Fields-and-Functionality" }

            # We'll redirect the error output to the success stream to make it easier to error out if nothing was found or something else went wrong.
            $NinjaPropertyValue = Ninja-Property-Docs-Get -AttributeName $Name @DocumentationParams 2>&1

            # Certain fields require more information to parse.
            if ($NeedsOptions -contains $Type) {
                $NinjaPropertyOptions = Ninja-Property-Docs-Options -AttributeName $Name @DocumentationParams 2>&1
            }
        }
        else {
            # We'll redirect error output to the success stream to make it easier to error out if nothing was found or something else went wrong.
            $NinjaPropertyValue = Ninja-Property-Get -Name $Name 2>&1

            # Certain fields require more information to parse.
            if ($NeedsOptions -contains $Type) {
                $NinjaPropertyOptions = Ninja-Property-Options -Name $Name 2>&1
            }
        }

        # If we received some sort of error it should have an exception property and we'll exit the function outputing nothing.
        if ($NinjaPropertyValue.Exception) {
            Write-Verbose $NinjaPropertyValue.ToString()
            return $null 
        }
        if ($NinjaPropertyOptions.Exception) {
            Write-Verbose $NinjaPropertyOptions.ToString() 
            return $null 
        }

        # This switch will compare the type given with the quoted string. If it matches, it'll parse it further; otherwise, the default option will be selected.
        switch ($Type) {
            "Checkbox" {
                # Checkboxes come in as a string representing an integer. We'll need to cast that string into an integer and then convert it to a more traditional boolean.
                [System.Convert]::ToBoolean([int]$NinjaPropertyValue)
            }
            "Dropdown" {
                # Drop-down custom fields come in as a comma-separated list of GUIDs; we'll compare these with all the options and return just the option values selected instead of a GUID.
                $Options = $NinjaPropertyOptions -replace '=', ',' | ConvertFrom-Csv -Header "GUID", "Name"
                $Options | Where-Object { $_.GUID -eq $NinjaPropertyValue } | Select-Object -ExpandProperty Name
            }
            "MultiSelect" {
                # Multi-Select custom fields come in as a comma-separated list of GUIDs; we'll compare these with all the options and return just the option values selected instead of a GUID.
                $Options = $NinjaPropertyOptions -replace '=', ',' | ConvertFrom-Csv -Header "GUID", "Name"
                $Selection = ($NinjaPropertyValue -split ',').trim()

                foreach ($Item in $Selection) {
                    $Options | Where-Object { $_.GUID -eq $Item } | Select-Object -ExpandProperty Name
                }
            }
            default {
                # If no type was given or not one that matches the above types just output what we retrieved.
                $NinjaPropertyValue
            }
        }
    }

    # Pulling the document name from the script form.
    if ($env:ninjaDocumentName -and $env:ninjaDocumentName -notlike "null") { $DocumentName = $env:ninjaDocumentName }

    if ($DocumentName) {
        Write-Host "Retrieving values from Ninja Document '$DocumentName'..."
        $DocumentationParams = @{
            DocumentName = $DocumentName
        }
    }

    if (Test-IsElevated) {
        Write-Host "Checking custom fields for VPN configuration settings ..."

        # Grabbing Documentation or Custom Field Values if the parameter wasn't given or is the default value.
        if (-not $AssumeUDPencapsulation) { $AssumeUDPencapsulation = Get-NinjaProperty -Name $UDPField -Type "Checkbox" @DocumentationParams }
        if (-not $Name) { $Name = Get-NinjaProperty -Name $NameField @DocumentationParams }
        if (-not $Server) { $Server = Get-NinjaProperty -Name $ServerField @DocumentationParams }
        if (-not $PreSharedKey) { $PreSharedKey = Get-NinjaProperty -Name $PreSharedKeyField @DocumentationParams }
        if (-not $TunnelType -and $TunnelType -eq "Automatic") { 
            $Tunnel = Get-NinjaProperty -Name $TunnelTypeField -Type "Dropdown" @DocumentationParams
            if ($Tunnel) { $TunnelType = $Tunnel } 
        }
        if (-not $AuthMethod) { $AuthMethod = Get-NinjaProperty -Name $AuthMethodField -Type "Multiselect" @DocumentationParams }
        if (-not $EncryptionLevel) { $EncryptionLevel = Get-NinjaProperty -Name $EncryptionLevelField -Type "Dropdown" @DocumentationParams }
        if (-not $DNSSuffix) { $DNSSuffix = Get-NinjaProperty -Name $DNSSuffixField @DocumentationParams }
        if (-not $RememberCreds) { $RememberCreds = Get-NinjaProperty -Name $RememberCredsField -Type "Checkbox" @DocumentationParams }
        if (-not $UseWinlogonCredential) { $UseWinLogonCredential = Get-NinjaProperty -Name $UseWinlogonCredsField -Type "Checkbox" @DocumentationParams }
        if (-not $SplitTunneling) { $SplitTunneling = Get-NinjaProperty -Name $SplitTunnelingField -Type "Checkbox" @DocumentationParams }
        if (-not $CreateShortcut) { $CreateShortcut = Get-NinjaProperty -Name $ShortcutField -Type "Checkbox" @DocumentationParams }
        if (-not $IconDirectory) { $IconDirectory = Get-NinjaProperty -Name $IconDirectoryField @DocumentationParams }
        if (-not $Url) { $Url = Get-NinjaProperty -Name $UrlField @DocumentationParams }
    }
    else {
        Write-Warning "Reading Custom Fields requires local admin privileges."
    }

    # If someone specifies something in the script form, we'll want to overwrite what the documentation says. Makes the script more useful for troubleshooting.
    if ($env:vpnName -and $env:vpnName -notlike "null") { $Name = $env:vpnName }
    if ($env:vpnServerAddress -and $env:vpnServerAddress -notlike "null") { $Server = $env:vpnServerAddress }
    if ($env:presharedKey -and $env:presharedKey -notlike "null") { $PreSharedKey = $env:presharedKey }
    if ($env:vpnTunnelType -and $env:vpnTunnelType -notlike "null") { $TunnelType = $env:vpnTunnelType }
    if ($env:authenticationMethod -and $env:authenticationMethod -notlike "null") { $AuthMethod = $env:authenticationMethod }
    if ($env:encryptionLevel -and $env:encryptionLevel -notlike "null") { $EncryptionLevel = $env:encryptionLevel }
    if ($env:dnsSuffix -and $env:dnsSuffix -notlike "null") { $DNSSuffix = $env:dnsSuffix }
    if ($env:iconPath -and $env:iconPath -notlike "null") { $Icon = $env:iconPath }
    if ($env:iconUrl -and $env:iconUrl -notlike "null") { $Url = $env:iconUrl }
    if ($env:iconDirectory -and $env:iconDirectory -notlike "null") { $IconDirectory = $env:iconDirectory }

    # If an authentication method was given, we'll want to parse that and validate it.
    if ($AuthMethod) {
        $AuthSelections = ($AuthMethod.Split(',')).Trim()

        $AuthSelections | ForEach-Object {
            switch ($_) {
                "PAP" { Write-Verbose "PAP Selected" }
                "Chap" { Write-Verbose "Chap Selected" }
                "MSChapv2" { Write-Verbose "Eap Selected" }
                "MachineCertificate" { Write-Verbose "MachineCertificate" }
                default {
                    Write-Error "$_ is invalid! The Valid auth types are 'PAP','Chap','MSChapv2' or 'MachineCertificate'."
                    exit 1
                }
            }
        }
    }

    # Validating encryption level. Not supporting "No Encryption". 
    if ($EncryptionLevel) {
        switch ($EncryptionLevel) {
            "Optional" { Write-Verbose "Optional Selected" }
            "Required" { Write-Verbose "Required Selected" }
            "Maximum" { Write-Verbose "Maximum Selected" }
            default {
                Write-Error "$EncryptionLevel is invalid! The valid encryption levels are 'Optional', 'Required', or 'Maximum'."
            }
        }
    }

    # This will set the tunnel type.
    switch ($TunnelType) {
        "L2TP" { Write-Verbose "L2TP Selected" }
        "SSTP" { Write-Verbose "SSTP Selected" }
        "IKEV2" { Write-Verbose "IKEV2 Selected" }
        "Automatic" { Write-Verbose "Automatic Selected" }
        default { 
            Write-Error "$TunnelType is invalid! The valid tunnel types are 'L2TP', 'SSTP', 'IKEv2', or 'Automatic'."
            exit 1
        }
    }

    # Error out if the only two mandatory parameters don't exist.
    if (-not $Server -or -not $Name) {
        Write-Error "Name and Server are required! If using documentation fields or custom fields, double-check that your field exists and is readable by Automations."
        exit 1
    }

    # Icons are minor, so if we're not given the information, we'll continue on without it and just let the technician know. They can always re-run it.
    if (($Url -or $IconDirectory) -and -not $CreateShortcut) {
        Write-Warning "An icon was given, but Create Shortcut was never used? Ignoring icon info..."
        $Url = $null
        $Icon = $null
        $IconDirectory = $null
    }

    # Icons are minor, so if we're not given the information, we'll continue on without it and just let the technician know. They can always re-run it.
    if ($Url -and -not $IconDirectory) {
        Write-Warning "An icon was given, but a place to store it wasn't? Use Icon Directory box to specify a directory to store it. (You may want this directory to be accessible by all users)"
        Write-Warning "Ignoring supplied icon info."
        $Icon = $null
        $Url = $null
    }
}
process {
    # Checking for existing VPNs
    $UserVPNs = Get-VpnConnection -Name $Name -EA Ignore
    $GlobalVPNs = Get-VpnConnection -Name $Name -AllUserConnection -EA Ignore

    # If the overwrite parameter wasn't specified, we'll error out as we won't be able to create the VPN.
    if (($UserVPNs -or $GlobalVPNs) -and -not $Overwrite) {
        Write-Error "$Name already exists! Use -Overwrite to replace it."
        if ($GlobalVPNs -and -not (Test-IsElevated)) { Write-Error "$($GlobalVPNs.Name) requires elevation to replace/overwrite." }
        exit 1
    }

    # Removing previous VPNs if overwrite was specified.
    if ($UserVPNs -and $Overwrite) {
        $UserVPNs | Remove-VpnConnection -Force
    }
    
    if ($GlobalVPNs -and $Overwrite) {
        if (Test-IsElevated) {
            $GlobalVPNs | Remove-VpnConnection -AllUserConnection -Force 
        }
        else {
            Write-Error "$($GlobalVPNs.Name) requires elevation to replace/overwrite."
            exit 1
        }
    }

    # Setting the AssumeUDPEncapsulationContextOnSendRule
    if ($AssumeUDPencapsulation -and (Test-IsElevated)) {
        Write-Warning "AssumeUDPEncapsulation requires a reboot to take effect. This script does NOT reboot the machine."
        Set-HKProperty -Name "AssumeUDPEncapsulationContextOnSendRule" -Path "HKLM:\SYSTEM\CurrentControlSet\Services\PolicyAgent" -Value "2"
    }

    # Building the Add-VPNConnection command based on what information was entered
    $ArgumentList = @{}
    if ($SplitTunneling) { $ArgumentList["SplitTunneling"] = $True }
    if ($Server) { $ArgumentList["ServerAddress"] = $Server }
    if ($Name) { $ArgumentList["Name"] = $Name }
    if ($PreSharedKey) { $ArgumentList["L2TPPsk"] = $PreSharedKey }
    if ($TunnelType) { $ArgumentList["TunnelType"] = $TunnelType }
    if ($AuthMethod) { $ArgumentList["AuthenticationMethod"] = $AuthSelections }
    if ($EncryptionLevel) { $ArgumentList["EncryptionLevel"] = $EncryptionLevel }
    if ($DNSSuffix) { $ArgumentList["DnsSuffix"] = $DNSSuffix }
    if ($RememberCreds) { $ArgumentList["RememberCredential"] = $True }
    if ($UseWinlogonCredential) { $ArgumentList["UseWinLogonCredential"] = $True }

    # If the script wasn't run as system, only the current user should be able to access the VPN.
    if (Test-IsSystem) { $ArgumentList["AllUserConnection"] = $True }
    $ArgumentList["Force"] = $True
    $ArgumentList["Passthru"] = $True

    Add-VpnConnection @ArgumentList | Format-Table -Property Name, ServerAddress, TunnelType, EncryptionLevel, AllUserConnection, SplitTunneling | Out-String | Write-Host

    switch (Test-IsSystem) {
        $True {
            $ShortcutPath = "$env:Public\Desktop\$Name.lnk"
            $RasFile = Join-Path $env:PROGRAMDATA "Microsoft\Network\Connections\Pbk\rasphone.pbk"
        }
        default { 
            $ShortcutPath = "$([Environment]::GetFolderPath("Desktop"))\$Name.lnk"
            $RasFile = Join-Path $env:APPDATA "Microsoft\Network\Connections\Pbk\rasphone.pbk"
        }
    }

    if (-not (Test-Path $RasFile -EA Ignore)) { 
        Write-Error "Failed to create vpn!"
        exit 1
    }

    # All Windows VPNs get a phonebook entry; we're going to check that the previous Add-VPNConnection was successful by looping through each line in the phonebook.
    $Phonebook = Get-Content -Path $RasFile

    for ($lineNumber = 0; $lineNumber -lt $Phonebook.Length; $lineNumber++) {
        if ($Phonebook[$lineNumber] -eq "[$Name]") {
            $Entry = $lineNumber
            break
        }
    }

    # If the VPN wasn't found, we're going to error out.
    if ($Entry -notmatch "\d") {
        Write-Error "Failed to create vpn!"
        exit 1
    }

    if ($CreateShortcut) {
        if ($IconDirectory -and -not (Test-Path $IconDirectory -ErrorAction SilentlyContinue)) {
            New-Item -ItemType Directory -Path $IconDirectory | Out-Null
        }

        # If we're given a URL, we'll want to download it.
        if ($Url) {
            $DownloadArguments = @{
                URL  = $Url
                Path = "$IconDirectory\vpnscript-$Name.png"
            }
            if ($SkipSleep) { $DownloadArguments["SkipSleep"] = $True }

            Invoke-Download @DownloadArguments

            if (Test-Path "$IconDirectory\vpnscript-$Name.png" -ErrorAction SilentlyContinue) {
                $Icon = "$IconDirectory\vpnscript-$Name.png"
            }
            else {
                $Icon = $Null
            }
        }
    
        # This will convert the base64 into an image and save it to the temp folder.
        if ($IconBase64 -and $IconDirectory -and -not $Icon -and -not $Url) {
            Write-Verbose "Converting Icon base64 to original image and saving to $IconDirectory..."

            ConvertFrom-Base64 -Base64 $IconBase64 -Path "$IconDirectory\vpnscript-$Name.Png"
            
            if (Test-Path "$IconDirectory\vpnscript-$Name.Png" -ErrorAction SilentlyContinue) {
                $Icon = "$IconDirectory\vpnscript-$Name.Png"
            }
            else {
                $Icon = $Null
            }
        }
    
        if ($Icon) {
            Write-Verbose "Converting image to icon and saving to $IconDirectory\vpnscript-$((Get-FileHash -Path $Icon -Algorithm MD5).Hash).ico ..."

            $NewName = "vpnscript-$((Get-FileHash -Path $Icon -Algorithm MD5).Hash).ico"
            ConvertFrom-Image -ImagePath $Icon -Path "$IconDirectory\$NewName"

            if (Test-Path "$IconDirectory\$NewName" -ErrorAction SilentlyContinue) {
                $Icon = "$IconDirectory\$NewName"
            }
            else {
                $Icon = $Null
            }
        }
    }

    if ($CreateShortcut) {
        $ShortcutArgs = @{
            Path       = $ShortcutPath
            Target     = "rasphone.exe"
            Arguments  = "-d `"$Name`""
            WorkingDir = "$env:SystemRoot\System32"
        }
        if ($Icon) { $ShortcutArgs["IconPath"] = $Icon } 

        New-Shortcut @ShortcutArgs
    }

    exit 0
}
end {
    
    
    
}

 

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Detailed Breakdown

This script operates by creating a VPN connection using the built-in Windows VPN client. It supports various VPN types (like L2TP, SSTP, IKEV2) and authentication methods. The script can retrieve VPN configuration details from a Ninja Document or custom fields, offering flexibility in deployment.

Key Functions:

  • VPN Configuration: It configures VPN with options for tunnel type, authentication methods, encryption levels, and more.
  • Custom Fields and Documentation: Allows pulling VPN information from Ninja Documentation or device-specific custom fields.
  • Icon Management: The script can download an image for the VPN shortcut icon and even convert it to the required format.
  • Shortcut Creation: It has the capability to create a desktop shortcut for easy VPN access.
  • Registry Modification: For certain VPNs, it modifies the Windows registry to enable UDP encapsulation.
  • Overwrite Option: It can overwrite an existing VPN connection with the same name.

Potential Use Cases

An IT administrator at a mid-sized company needs to deploy a secure VPN connection to all remote employees. Using this script, they can quickly establish a consistent VPN setup across all devices, ensuring secure access to the company’s network.

Comparisons

Traditionally, VPNs are set up manually through the Windows interface or using individual scripts. This script offers a more unified and automated approach, reducing time and potential errors compared to manual setup.

FAQs

  • Can the script handle different VPN types?
    Yes, it supports L2TP, SSTP, IKEV2, and Automatic types.
  • Is it possible to use this script without Ninja Documentation?
    Absolutely, it can function with or without Ninja Documentation.
  • How does this script enhance security?
    By standardizing VPN setups, it minimizes the risk of misconfigurations, enhancing overall security.

Implications

Using this script, especially in large deployments, could significantly enhance network security by ensuring uniformity in VPN configurations. However, it’s crucial to keep the script updated to adapt to any changes in VPN standards or Windows updates.

Recommendations

  • Test Before Deployment: Always test the script in a controlled environment before widespread use.
  • Keep Updated: Regularly update the script to align with the latest VPN standards and Windows updates.
  • Secure Storage: Store your script and related credentials securely to prevent unauthorized access.

Final Thoughts

In the context of VPN management, NinjaOne offers a robust platform for IT professionals, enhancing the efficiency and security of network management tasks. This script, in combination with NinjaOne’s capabilities, can streamline VPN deployment, making it a valuable tool in the arsenal of modern IT management.

Next Steps

Building an efficient and effective IT team requires a centralized solution that acts as your core service deliver tool. NinjaOne enables IT teams to monitor, manage, secure, and support all their devices, wherever they are, without the need for complex on-premises infrastructure.

Learn more about NinjaOne Endpoint Management, check out a live tour, or start your free trial of the NinjaOne platform.

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