ADFSToolkit

2.0.0

Private/Verify-ADFSTkEventLogUsage.ps1

                                function Verify-ADFSTkEventLogUsage 

{

[CmdletBinding(DefaultParameterSetName='Auto')]

param(

    [Parameter(Mandatory=$true, 

                ParameterSetName='Manual')]

    $LogName,

    [Parameter(Mandatory=$true, 

                ParameterSetName='Manual')]

    $Source

)

    # We ingest the eventLogging settings from the config file and set things up to accept eventlog traffic 

    $EventLogEnabled = $false

    if (!$PSBoundParameters.ContainsKey('LogName'))

    {

        if ($Settings.configuration.Logging -ne $null -and `

            $Settings.configuration.Logging.HasAttribute('useEventLog') -and `

            $Settings.configuration.Logging.useEventLog.ToLower() -eq 'true')

        {

            $LogName = $Settings.configuration.logging.LogName

            $Source = $Settings.configuration.logging.Source

        }

        else

        {

            # EventLogging is not used, we signal false  

            return $false

        }

    }

    try 

    {

        # We know we should log to the event log by the time we are here.

        # Both LogName and Source need to be non empty

        if ([System.Diagnostics.EventLog]::Exists($LogName) -and [System.Diagnostics.EventLog]::SourceExists($Source))

        {

            # This is good, both log and source exist, and logging is activatated

            Write-EventLog -LogName $LogName -Source $Source -EventId 1 -Message (Get-ADFSTkLanguageText logEventLogUsed)

            $EventLogEnabled = $true

        }

        else 

        {

            # eventlog does not exist yet, create when sufficient info is provided

            if (![string]::IsNullOrEmpty($LogName) -and -not [string]::IsNullOrEmpty($Source))

            {

                #both the logName and Source need to exist before we'll create them.

                #First, we delete the eventlog source so we can assign it to the right LogName destination

                Remove-EventLog -Source $Source -ErrorAction SilentlyContinue

                # Second, we now issue the appropriate Association to the LogName

                # If the log does not exist, New-EventLog creates the log and uses this value 

                # for the Log and LogDisplayName properties of the new event log. 

                # If the log exists, New-EventLog registers a new source for the event log.

                # https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/new-eventlog?view=powershell-5.1 

                New-EventLog -LogName $LogName -Source $Source

                Limit-EventLog -OverflowAction OverWriteAsNeeded -LogName $LogName

                Write-EventLog -LogName $LogName -Source $Source -EventId 1 -Message (Get-ADFSTkLanguageText logEventLogCreated)

                $EventLogEnabled=1

            }

            else 

            {

                Write-ADFSTkLog (Get-ADFSTkLanguageText logCouldNotCreateEventLog)

                $EventLogEnabled = $false

            }

        } # end eventlog creation step

    }

    catch

    {

        throw $_

    }

    # pass the true/false for eventlog to invoker

    return $EventLogEnabled

}

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