DSCResources/DSC_WindowsEventLog/DSC_WindowsEventLog.psm1
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$modulePath = Join-Path -Path (Split-Path -Path (Split-Path -Path $PSScriptRoot -Parent) -Parent) -ChildPath 'Modules' # Import the ComputerManagementDsc Common Modules Import-Module -Name (Join-Path -Path $modulePath ` -ChildPath (Join-Path -Path 'ComputerManagementDsc.Common' ` -ChildPath 'ComputerManagementDsc.Common.psm1')) # Import Localization Strings $script:localizedData = Get-LocalizedData -ResourceName 'DSC_WindowsEventLog' <# .SYNOPSIS Gets the current state of the Windows Event Log. .PARAMETER LogName Specifies the given name of a Windows Event Log. #> function Get-TargetResource { [CmdletBinding()] [OutputType([System.Collections.Hashtable])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter()] [System.Boolean] $IsEnabled ) $log = Get-WindowsEventLog -LogName $LogName $LogRetentionDays = (Get-EventLog -List | Where-Object -Property Log -eq $LogName).minimumRetentionDays $returnValue = @{ LogName = [System.String] $LogName LogFilePath = [system.String] $log.LogFilePath MaximumSizeInBytes = [System.Int64] $log.MaximumSizeInBytes IsEnabled = [System.Boolean] $log.IsEnabled LogMode = [System.String] $log.LogMode SecurityDescriptor = [System.String] $log.SecurityDescriptor LogRetentionDays = [System.Int32] $logRetentionDays } Write-Verbose -Message ($script:localizedData.GettingEventlogName -f $LogName) return $returnValue } <# .SYNOPSIS Sets the current state of the Windows Event Log. .PARAMETER LogName Specifies the given name of a Windows Event Log. .PARAMETER MaximumSizeInBytes Specifies the given maximum size in bytes for a specified Windows Event Log. .PARAMETER LogMode Specifies the given LogMode for a specified Windows Event Log. .PARAMETER LogRetentionDays Specifies the given LogRetentionDays for the Logmode 'AutoBackup'. .PARAMETER SecurityDescriptor Specifies the given SecurityDescriptor for a specified Windows Event Log. .PARAMETER IsEnabled Specifies the given state of a Windows Event Log. .PARAMETER LogFilePath Specifies the given LogFile path of a Windows Event Log. #> function Set-TargetResource { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter()] [System.Boolean] $IsEnabled, [Parameter()] [System.Int64] $MaximumSizeInBytes, [Parameter()] [ValidateSet('AutoBackup', 'Circular', 'Retain')] [System.String] $LogMode, [Parameter()] [System.Int32] $LogRetentionDays, [Parameter()] [System.String] $SecurityDescriptor, [Parameter()] [System.String] $LogFilePath ) $log = Get-WindowsEventLog -LogName $LogName if ($null -eq $log) { return } $shouldSaveLogFile = $false Write-Verbose -Message ($script:localizedData.GettingEventlogName -f $LogName) if ($IsEnabled -eq $true) { if ($PSBoundParameters.ContainsKey('IsEnabled') -and $IsEnabled -ne $log.IsEnabled) { Write-Verbose -Message ($script:localizedData.SettingEventlogIsEnabled -f $LogName, $IsEnabled) $log.IsEnabled = $IsEnabled $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('MaximumSizeInBytes') -and $MaximumSizeInBytes -ne $log.MaximumSizeInBytes) { Write-Verbose -Message ($script:localizedData.SettingEventlogLogSize -f $LogName, $MaximumSizeInBytes) $log.MaximumSizeInBytes = $MaximumSizeInBytes $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('LogMode') -and $LogMode -ne $log.LogMode) { Write-Verbose -Message ($script:localizedData.SettingEventlogLogMode -f $LogName, $LogMode) $log.LogMode = $LogMode $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('SecurityDescriptor') -and $SecurityDescriptor -ne $log.SecurityDescriptor) { Write-Verbose -Message ($script:localizedData.SettingEventlogSecurityDescriptor -f $LogName, $SecurityDescriptor) $log.SecurityDescriptor = $SecurityDescriptor $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('LogFilePath') -and $LogFilePath -ne $log.LogFilePath) { Write-Verbose -Message ($script:localizedData.SettingEventlogLogFilePath -f $LogName, $LogFilePath) $log.LogFilePath = $LogFilePath $shouldSaveLogFile = $true } } else { Write-Verbose -Message ($script:localizedData.SettingEventlogIsEnabled -f $LogName, $IsEnabled) $log.IsEnabled = $IsEnabled $shouldSaveLogFile = $true } if ($shouldSaveLogFile -eq $true) { Save-LogFile -Log $log } if ($PSBoundParameters.ContainsKey('LogRetentionDays')) { if ($LogMode -eq 'AutoBackup' -and (Get-EventLog -List | Where-Object -FilterScript {$_.Log -like $LogName})) { $matchingEventLog = Get-EventLog -List | Where-Object -FilterScript { $_.Log -eq $LogName } $minimumRetentionDaysForLog = $matchingEventLog.minimumRetentionDays if ($LogRetentionDays -ne $minimumRetentionDaysForLog) { Set-LogRetentionDays -LogName $LogName -LogRetentionDays $LogRetentionDays } } else { Write-Verbose -Message ($script:localizedData.EventlogLogRetentionDaysWrongMode -f $LogName) } } } <# .SYNOPSIS Tests if the the current state of the Windows Event Log is in the desired state. .PARAMETER LogName Specifies the given name of a Windows Event Log. .PARAMETER MaximumSizeInBytes Specifies the given maximum size in bytes for a specified Windows Event Log. .PARAMETER LogMode Specifies the given LogMode for a specified evWindows Event Logentlog. .PARAMETER LogRetentionDays Specifies the given LogRetentionDays for the Logmode 'AutoBackup'. .PARAMETER SecurityDescriptor Specifies the given SecurityDescriptor for a specified Windows Event Log. .PARAMETER IsEnabled Specifies the given state of a Windows Event Log. .PARAMETER LogFilePath Specifies the given LogFile path of a Windows Event Log. #> function Test-TargetResource { [CmdletBinding()] [OutputType([System.Boolean])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter()] [System.Boolean] $IsEnabled, [Parameter()] [ValidateRange(1028kb, 18014398509481983kb)] [System.Int64] $MaximumSizeInBytes, [Parameter()] [ValidateSet('AutoBackup', 'Circular', 'Retain')] [System.String] $LogMode, [Parameter()] [ValidateRange(1, 365)] [System.Int32] $LogRetentionDays, [Parameter()] [System.String] $SecurityDescriptor, [Parameter()] [System.String] $LogFilePath ) $log = Get-WindowsEventLog -LogName $LogName if ($null -eq $log) { return } $desiredState = $true if ($IsEnabled -eq $true) { if ($PSBoundParameters.ContainsKey('IsEnabled') -and $log.IsEnabled -ne $IsEnabled) { Write-Verbose -Message ($script:localizedData.TestingEventlogIsEnabled -f $LogName, $IsEnabled) $desiredState = $false } else { Write-Verbose -Message ($script:localizedData.SetResourceIsInDesiredState -f $LogName, 'IsEnabled') } if ($PSBoundParameters.ContainsKey('MaximumSizeInBytes') -and $log.MaximumSizeInBytes -ne $MaximumSizeInBytes) { Write-Verbose -Message ($script:localizedData.TestingEventlogMaximumSizeInBytes -f $LogName, $MaximumSizeInBytes) $desiredState = $false } else { Write-Verbose -Message ($script:localizedData.SetResourceIsInDesiredState -f $LogName, 'MaximumSizeInBytes') } if ($PSBoundParameters.ContainsKey('LogMode') -and $log.LogMode -ne $LogMode) { Write-Verbose -Message ($script:localizedData.TestingEventlogLogMode -f $LogName, $LogMode) $desiredState = $false } else { Write-Verbose -Message ($script:localizedData.SetResourceIsInDesiredState -f $LogName, 'LogMode') } if ($PSBoundParameters.ContainsKey('LogRetentionDays')) { if ($LogMode -eq 'AutoBackup') { $minimumRetentionDays = Get-EventLog -List | Where-Object -FilterScript { $_.Log -eq $LogName } if ($LogRetentionDays -ne $minimumRetentionDays.minimumRetentionDays) { Write-Verbose -Message ($script:localizedData.TestingEventlogLogRetentionDays -f $LogName, $LogRetentionDays) $desiredState = $false } else { Write-Verbose -Message ($script:localizedData.SetResourceIsInDesiredState -f $LogName, 'LogRetentionDays') } } else { Write-Verbose -Message ($script:localizedData.EventlogLogRetentionDaysWrongMode -f $LogName) $desiredState = $false } } if ($PSBoundParameters.ContainsKey('LogFilePath') -and $log.LogFilePath -ne $LogFilePath) { Write-Verbose -Message ($script:localizedData.TestingWindowsEventlogLogFilePath -f $LogName, $LogFilePath) $desiredState = $false } else { Write-Verbose -Message ($script:localizedData.SetResourceIsInDesiredState -f $LogName, 'LogFilePath') } if ($PSBoundParameters.ContainsKey('SecurityDescriptor') -and $log.SecurityDescriptor -ne $SecurityDescriptor) { Write-Verbose -Message ($script:localizedData.TestingWindowsEventlogSecurityDescriptor -f $LogName, $SecurityDescriptor) $desiredState = $false } else { Write-Verbose -Message ($script:localizedData.SetResourceIsInDesiredState -f $LogName, 'SecurityDescriptor') } } else { if ($PSBoundParameters.ContainsKey('IsEnabled') -and $log.IsEnabled -ne $IsEnabled) { Write-Verbose -Message ($script:localizedData.TestingEventlogIsEnabled -f $LogName, $IsEnabled) $desiredState = $false } else { Write-Verbose -Message ($script:localizedData.SetResourceIsInDesiredState -f $LogName, 'IsEnabled') } } return $desiredState } <# .SYNOPSIS Helper function for the Windows Event Log. .PARAMETER Log Gets the specified Windows Event Log properties. #> function Get-WindowsEventLog { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.String] $LogName ) $log = Get-WinEvent -ListLog $LogName if (!$log) { Write-Warning ` -Message ($script:localizedData.WindowsEventLogNotFound -f $LogName) } else { Write-Verbose -Message ($script:localizedData.WindowsEventLogFound -f $LogName) return $log } } <# .SYNOPSIS Save the Windows Event Log properties. .PARAMETER Log Specifies the given object of a Windows Event Log. #> function Save-LogFile { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.Object] $Log ) try { $Log.SaveChanges() Write-Verbose -Message ($script:localizedData.SaveWindowsEventlogSuccess) } catch { Write-Verbose -Message ($script:localizedData.SaveWindowsEventlogFailure) } } <# .SYNOPSIS Set the Log Retention for a Windows Event Log. .PARAMETER LogName Specifies the given name of a Windows Event Log. .PARAMETER Retention Specifies the given RetentionDays for LogMode Autobackup. #> function Set-LogRetentionDays { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter(Mandatory = $true)] [System.Int32] $LogRetentionDays ) Write-Verbose -Message ($script:localizedData.SettingEventlogLogRetentionDays -f $LogName, $LogRetentionDays) try { Limit-Eventlog -LogName $LogName -OverflowAction 'OverwriteOlder' -RetentionDays $LogRetentionDays Write-Verbose -Message ($script:localizedData.SettingWindowsEventlogRetentionDaysSuccess -f $LogName, $LogRetentionDays) } catch { Write-Verbose -Message ($script:localizedData.SettingWindowsEventlogRetentionDaysFailed -f $LogName, $LogRetentionDays) } } Export-ModuleMember -Function *-TargetResource |