WDACConfig

0.2.8

Shared/Confirm-CertCN.psm1

                                Function Confirm-CertCN {

    <#

    .SYNOPSIS

        Function to check Certificate Common name - used mostly to validate values in UserConfigurations.json

    .PARAMETER CN

        Common name of the certificate to check

    .INPUTS

        System.String

    .OUTPUTS

        System.Boolean

    #>

    [CmdletBinding()]

    param (

        [parameter(Mandatory = $true)]

        [System.String]$CN

    )

    # Importing the $PSDefaultParameterValues to the current session, prior to everything else

    . "$ModuleRootPath\CoreExt\PSDefaultParameterValues.ps1"

    # Create an empty array to store the output objects

    [System.Object[]]$Output = @()

    # Loop through each certificate that uses RSA algorithm (Because ECDSA is not supported for signing WDAC policies) in the current user's personal store and extract the relevant properties

    foreach ($Cert in (Get-ChildItem -Path 'Cert:\CurrentUser\My' | Where-Object -FilterScript { $_.PublicKey.Oid.FriendlyName -eq 'RSA' })) {

        # Takes care of certificate subjects that include comma in their CN

        # Determine if the subject contains a comma

        if ($Cert.Subject -match 'CN=(?<RegexTest>.*?),.*') {

            # If the CN value contains double quotes, use split to get the value between the quotes

            if ($matches['RegexTest'] -like '*"*') {

                $SubjectCN = ($Element.Certificate.Subject -split 'CN="(.+?)"')[1]

            }

            # Otherwise, use the named group RegexTest to get the CN value

            else {

                $SubjectCN = $matches['RegexTest']

            }

        }

        # If the subject does not contain a comma, use a lookbehind to get the CN value

        elseif ($Cert.Subject -match '(?<=CN=).*') {

            $SubjectCN = $matches[0]

        }

        # Create a custom object with the certificate thumbprint, subject, friendly name and subject CN

        $Output += [PSCustomObject]@{

            Thumbprint   = [System.String]$Cert.Thumbprint

            Subject      = [System.String]$Cert.Subject

            FriendlyName = [System.String]$Cert.FriendlyName

            SubjectCN    = [System.String]$SubjectCN

        }

    }

    return [System.Boolean]([System.String[]]$Output.SubjectCN -contains $CN ? $true : $false)

}

# Export external facing functions only, prevent internal functions from getting exported

Export-ModuleMember -Function 'Confirm-CertCN'

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