MiniLab

0.8.3

Public/Get-DSCEncryptionCert.ps1

                                <#

    .SYNOPSIS

        This function creates a New Self-Signed Certificate meant to be used for DSC secret encryption and exports it to the

        specified directory.

    .DESCRIPTION

        See .SYNOPSIS

    .NOTES

    .PARAMETER MachineName

        This parameter is MANDATORY.

        This parameter takes a string that represents the Subject Alternative Name (SAN) on the Self-Signed Certificate.

    .PARAMETER ExportDirectory

        This parameter is MANDATORY.

        This parameter takes a string that represents the full path to a directory that will contain the new Self-Signed Certificate.

    .EXAMPLE

        # Import the MiniLab Module and -

        PS C:\Users\zeroadmin> Get-DSCEncryptionCert -MachineName $env:ComputerName -ExportDirectory "C:\DSCConfigs"

#>

function Get-DSCEncryptionCert {

    [CmdletBinding()]

    param (

        [Parameter(Mandatory=$True)]

        [string]$MachineName,

        [Parameter(Mandatory=$True)]

        [string]$ExportDirectory

    )

    if (!$(Test-Path $ExportDirectory)) {

        Write-Error "The path '$ExportDirectory' was not found! Halting!"

        $global:FunctionResult = "1"

        return

    }

    $CertificateFriendlyName = "DSC Credential Encryption"

    $Cert = Get-ChildItem -Path "Cert:\LocalMachine\My" | Where-Object {

        $_.FriendlyName -eq $CertificateFriendlyName

    } | Select-Object -First 1

    if (!$Cert) {

        $NewSelfSignedCertExSplatParams = @{

            Subject             = "CN=$Machinename"

            EKU                 = @('1.3.6.1.4.1.311.80.1','1.3.6.1.5.5.7.3.1','1.3.6.1.5.5.7.3.2')

            KeyUsage            = 'DigitalSignature, KeyEncipherment, DataEncipherment'

            SAN                 = $MachineName

            FriendlyName        = $CertificateFriendlyName

            Exportable          = $True

            StoreLocation       = 'LocalMachine'

            StoreName           = 'My'

            KeyLength           = 2048

            ProviderName        = 'Microsoft Enhanced Cryptographic Provider v1.0'

            AlgorithmName       = "RSA"

            SignatureAlgorithm  = "SHA256"

        }

        New-SelfsignedCertificateEx @NewSelfSignedCertExSplatParams

        # There is a slight delay before new cert shows up in Cert:

        # So wait for it to show.

        while (!$Cert) {

            $Cert = Get-ChildItem -Path "Cert:\LocalMachine\My" | Where-Object {$_.FriendlyName -eq $CertificateFriendlyName}

        }

    }

    $null = Export-Certificate -Type CERT -Cert $Cert -FilePath "$ExportDirectory\DSCEncryption.cer"

    $CertInfo = [System.Security.Cryptography.X509Certificates.X509Certificate2]::new()

    $CertInfo.Import("$ExportDirectory\DSCEncryption.cer")

    [pscustomobject]@{

        CertFile        = Get-Item "$ExportDirectory\DSCEncryption.cer"

        CertInfo        = $CertInfo

    }

}

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