Functions/Get-SecurityAuditPolicySetting.ps1

<#
    .SYNOPSIS
    Get one audit policy setting on the local system.

    .DESCRIPTION
    This command uses the auditpol.exe command to get the current audit policy
    setting for the local system and parses the output for the target setting.

    .INPUTS
    None.

    .OUTPUTS
    System.Boolean. Return true if the audit policy is enabled, false if not.

    .EXAMPLE
    PS C:\> Get-SecurityAuditPolicySetting -Category 'Object Access' -Subcategory 'File System' -Setting 'Success'
    Returns the current setting for success audit on the file system object
    access audit policy.

    .NOTES
    Author : Claudio Spizzi
    License : MIT License

    .LINK
    https://github.com/claudiospizzi/SecurityFever
#>


function Get-SecurityAuditPolicySetting
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param
    (
        # Audit policy category
        [Parameter(Mandatory = $true)]
        [System.String]
        $Category,

        # Audit policy subcategory
        [Parameter(Mandatory = $true)]
        [System.String]
        $Subcategory,

        # Audit policy setting
        [Parameter(Mandatory = $true)]
        [ValidateSet('Success', 'Failure')]
        [System.String]
        $Setting
    )

    $auditPolicies = Get-SecurityAuditPolicy

    foreach ($auditPolicy in $auditPolicies)
    {
        if ($auditPolicy.Category -eq $Category -and $auditPolicy.Subcategory -eq $Subcategory)
        {
            switch ($Setting)
            {
                'Success' { return $auditPolicy.AuditSuccess }
                'Failure' { return $auditPolicy.AuditFailure }
            }
        }
    }

    throw "No audit policy found for category $Category and subcategory $Subcategory."
}