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-Module -Name (Join-Path -Path $modulePath -ChildPath 'DscResource.Common') # Import Localization Strings $script:localizedData = Get-LocalizedData -DefaultUICulture 'en-US' <# .SYNOPSIS Gets the current state of an event log. .PARAMETER LogName Specifies the name of a valid event log. #> function Get-TargetResource { [CmdletBinding()] [OutputType([System.Collections.Hashtable])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName ) Write-Verbose -Message ($script:localizedData.GetTargetResource -f $LogName) $log = Get-WindowsEventLog -LogName $LogName if ($log.IsClassicLog -eq $true) { $logRetentionDays = Get-WindowsEventLogRetentionDays -LogName $LogName } $restrictGuestAccess = Get-WindowsEventLogRestrictGuestAccess -LogName $LogName $returnValue = @{ LogName = $LogName LogFilePath = $log.LogFilePath MaximumSizeInBytes = [System.Int64] $log.MaximumSizeInBytes IsEnabled = $log.IsEnabled LogMode = $log.LogMode SecurityDescriptor = $log.SecurityDescriptor LogRetentionDays = $logRetentionDays RestrictGuestAccess = $restrictGuestAccess } return $returnValue } <# .SYNOPSIS Sets the desired state of an event log. .PARAMETER LogName Specifies the name of a valid event log. .PARAMETER MaximumSizeInBytes Specifies the maximum size in bytes for the specified event log. .PARAMETER LogMode Specifies the log mode for the specified event log. .PARAMETER LogRetentionDays Specifies the number of days to retain events when the log mode is AutoBackup. .PARAMETER SecurityDescriptor Specifies the SDDL for the specified event log. .PARAMETER IsEnabled Specifies whether the specified event log should be enabled or disabled. .PARAMETER LogFilePath Specifies the file name and path for the specified event log. .PARAMETER RegisteredSource Specifies the name of an event source to register for the specified event log. .PARAMETER CategoryResourceFile Specifies the category resource file for the event source. .PARAMETER MessageResourceFile Specifies the message resource file for the event source. .PARAMETER ParameterResourceFile Specifies the parameter resource file for the event source. .PARAMETER RestrictGuestAccess Specifies whether to allow guests to have access to the specified event log. #> function Set-TargetResource { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter()] [System.Boolean] $IsEnabled, [Parameter()] [ValidateRange(64KB, 4GB)] [System.Int64] $MaximumSizeInBytes, [Parameter()] [ValidateSet('AutoBackup', 'Circular', 'Retain')] [System.String] $LogMode, [Parameter()] [System.Int32] [ValidateRange(0, 365)] $LogRetentionDays, [Parameter()] [System.String] $SecurityDescriptor, [Parameter()] [System.String] $LogFilePath, [Parameter()] [System.String] $RegisteredSource, [Parameter()] [System.String] $CategoryResourceFile, [Parameter()] [System.String] $MessageResourceFile, [Parameter()] [System.String] $ParameterResourceFile, [Parameter()] [System.Boolean] $RestrictGuestAccess ) $shouldSaveLogFile = $false $shouldRegisterSource = $false $log = Get-WindowsEventLog -LogName $LogName $currentRestrictGuestAccess = Get-WindowsEventLogRestrictGuestAccess -LogName $LogName if ($PSBoundParameters.ContainsKey('IsEnabled') ` -and $IsEnabled -ne $log.IsEnabled) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'IsEnabled', $log.IsEnabled, $isEnabled) $log.IsEnabled = $IsEnabled $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('MaximumSizeInBytes') ` -and $MaximumSizeInBytes -ne $log.MaximumSizeInBytes) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'MaximumSizeInBytes', $log.MaximumSizeInBytes, $MaximumSizeInBytes) $log.MaximumSizeInBytes = $MaximumSizeInBytes $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('LogMode') ` -and $LogMode -ne $log.LogMode) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'LogMode', $log.LogMode, $LogMode) $log.LogMode = $LogMode $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('SecurityDescriptor') ` -and $SecurityDescriptor -ne $log.SecurityDescriptor) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'SecurityDescriptor', $log.SecurityDescriptor, $SecurityDescriptor) $log.SecurityDescriptor = $SecurityDescriptor $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('LogFilePath') ` -and $LogFilePath -ne $log.LogFilePath) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'LogFilePath', $log.LogFilePath, $LogFilePath) $log.LogFilePath = $LogFilePath $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('RestrictGuestAccess') ` -and $RestrictGuestAccess -ne $currentRestrictGuestAccess) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'RestrictGuestAccess', $currentRestrictGuestAccess, $RestrictGuestAccess) if ($PSBoundParameters.ContainsKey('SecurityDescriptor')) { Write-Warning -Message ($script:localizedData.ModifyUserProvidedSecurityDescriptor) $log.SecurityDescriptor = Set-WindowsEventLogRestrictGuestAccess ` -LogName $LogName -RestrictGuestAccess $RestrictGuestAccess -Sddl $SecurityDescriptor } else { Write-Verbose -Message ($script:localizedData.ModifySystemProvidedSecurityDescriptor) $log.SecurityDescriptor = Set-WindowsEventLogRestrictGuestAccess ` -LogName $LogName -RestrictGuestAccess $RestrictGuestAccess -Sddl $log.SecurityDescriptor } $shouldSaveLogFile = $true } if ($PSBoundParameters.ContainsKey('RegisteredSource')) { $sourceProperties = @{ LogName = $LogName SourceName = $RegisteredSource } $currentRegisteredSource = Get-WindowsEventLogRegisteredSource ` -LogName $LogName ` -SourceName $RegisteredSource $currentCategoryResourceFile = Get-WindowsEventLogRegisteredSourceFile ` -LogName $LogName ` -SourceName $RegisteredSource ` -ResourceFileType Category $currentMessageResourceFile = Get-WindowsEventLogRegisteredSourceFile ` -LogName $LogName ` -SourceName $RegisteredSource ` -ResourceFileType Message $currentParameterResourceFile = Get-WindowsEventLogRegisteredSourceFile ` -LogName $LogName ` -SourceName $RegisteredSource ` -ResourceFileType Parameter if ($RegisteredSource -ne $currentRegisteredSource) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'RegisteredSource', $currentRegisteredSource, $RegisteredSource) $shouldRegisterSource = $true } if ($PSBoundParameters.ContainsKey('CategoryResourceFile') ` -and $CategoryResourceFile -ne $currentCategoryResourceFile) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'CategoryResourceFile', $currentCategoryResourceFile, $CategoryResourceFile) $sourceProperties.CategoryResourceFile = $CategoryResourceFile $shouldRegisterSource = $true } if ($PSBoundParameters.ContainsKey('MessageResourceFile') ` -and $MessageResourceFile -ne $currentMessageResourceFile) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'MessageResourceFile', $currentMessageResourceFile, $MessageResourceFile) $sourceProperties.MessageResourceFile = $MessageResourceFile $shouldRegisterSource = $true } if ($PSBoundParameters.ContainsKey('ParameterResourceFile') ` -and $ParameterResourceFile -ne $currentParameterResourceFile) { Write-Verbose -Message ($script:localizedData.SetTargetResourceProperty ` -f $LogName, 'ParameterResourceFile', $currentParameterResourceFile, $ParameterResourceFile) $sourceProperties.ParameterResourceFile = $ParameterResourceFile $shouldRegisterSource = $true } } if ($shouldSaveLogFile) { Save-WindowsEventLog -Log $log } if ($shouldRegisterSource) { Register-WindowsEventLogSource @sourceProperties } if ($PSBoundParameters.ContainsKey('LogRetentionDays')) { if ($log.IsClassicLog -eq $true) { Set-WindowsEventLogRetentionDays -LogName $LogName -LogMode $LogMode -LogRetentionDays $LogRetentionDays } else { Write-Warning -Message ($script:localizedData.SetWindowsEventLogRetentionDaysNotClassic -f $LogName) } } } <# .SYNOPSIS Tests if the current state of an event log is the same as the desired state. .PARAMETER LogName Specifies the name of a valid event log. .PARAMETER MaximumSizeInBytes Specifies the maximum size in bytes for the specified event log. .PARAMETER LogMode Specifies the log mode for the specified event log. .PARAMETER LogRetentionDays Specifies the number of days to retain events when the log mode is AutoBackup. .PARAMETER SecurityDescriptor Specifies the SDDL for the specified event log. .PARAMETER IsEnabled Specifies whether the specified event log should be enabled or disabled. .PARAMETER LogFilePath Specifies the file name and path for the specified event log. .PARAMETER RegisteredSource Specifies the name of an event source in the specified event log. .PARAMETER CategoryResourceFile Specifies the category resource file for the event source. .PARAMETER MessageResourceFile Specifies the message resource file for the event source. .PARAMETER ParameterResourceFile Specifies the parameter resource file for the event source. #> function Test-TargetResource { [CmdletBinding()] [OutputType([System.Boolean])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter()] [System.Boolean] $IsEnabled, [Parameter()] [ValidateRange(64KB, 4GB)] [System.Int64] $MaximumSizeInBytes, [Parameter()] [ValidateSet('AutoBackup', 'Circular', 'Retain')] [System.String] $LogMode, [Parameter()] [ValidateRange(0, 365)] [System.Int32] $LogRetentionDays, [Parameter()] [System.String] $SecurityDescriptor, [Parameter()] [System.String] $LogFilePath, [Parameter()] [System.String] $RegisteredSource, [Parameter()] [System.String] $CategoryResourceFile, [Parameter()] [System.String] $MessageResourceFile, [Parameter()] [System.String] $ParameterResourceFile, [Parameter()] [System.Boolean] $RestrictGuestAccess ) $inDesiredState = $true $log = Get-WindowsEventLog -LogName $LogName if ($log.IsClassicLog -eq $true) { $currentLogRetentionDays = Get-WindowsEventLogRetentionDays -LogName $LogName } $currentRestrictGuestAccess = Get-WindowsEventLogRestrictGuestAccess -LogName $LogName if ($PSBoundParameters.ContainsKey('IsEnabled') ` -and $IsEnabled -ne $log.IsEnabled) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'IsEnabled', $log.IsEnabled, $IsEnabled) $inDesiredState = $false } if ($PSBoundParameters.ContainsKey('MaximumSizeInBytes') ` -and $MaximumSizeInBytes -ne $log.MaximumSizeInBytes) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'MaximumSizeInBytes', $log.MaximumSizeInBytes, $MaximumSizeInBytes) $inDesiredState = $false } if ($PSBoundParameters.ContainsKey('LogMode') ` -and $LogMode -ne $log.LogMode) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'LogMode', $log.LogMode, $LogMode) $inDesiredState = $false } if ($PSBoundParameters.ContainsKey('SecurityDescriptor') ` -and $SecurityDescriptor -ne $log.SecurityDescriptor) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'SecurityDescriptor', $log.SecurityDescriptor, $SecurityDescriptor) $inDesiredState = $false } if ($PSBoundParameters.ContainsKey('LogFilePath') ` -and $LogFilePath -ne $log.LogFilePath) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'LogFilePath', $log.LogFilePath, $LogFilePath) $inDesiredState = $false } if ($PSBoundParameters.ContainsKey('RestrictGuestAccess') ` -and $RestrictGuestAccess -ne $currentRestrictGuestAccess) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'RestrictGuestAccess', $currentRestrictGuestAccess, $RestrictGuestAccess) $inDesiredState = $false } if ($PSBoundParameters.ContainsKey('RegisteredSource')) { $currentRegisteredSource = Get-WindowsEventLogRegisteredSource ` -LogName $LogName ` -SourceName $RegisteredSource $currentCategoryResourceFile = Get-WindowsEventLogRegisteredSourceFile ` -LogName $LogName ` -SourceName $RegisteredSource ` -ResourceFileType Category $currentMessageResourceFile = Get-WindowsEventLogRegisteredSourceFile ` -LogName $LogName ` -SourceName $RegisteredSource ` -ResourceFileType Message $currentParameterResourceFile = Get-WindowsEventLogRegisteredSourceFile ` -LogName $LogName ` -SourceName $RegisteredSource ` -ResourceFileType Parameter if ($RegisteredSource -ne $currentRegisteredSource) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'RegisteredSource', $currentRegisteredSource, $RegisteredSource) $inDesiredState = $false } if ($PSBoundParameters.ContainsKey('CategoryResourceFile') ` -and $CategoryResourceFile -ne $currentCategoryResourceFile) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'CategoryResourceFile', $currentCategoryResourceFile, $CategoryResourceFile) $inDesiredState = $false } if ($PSBoundParameters.ContainsKey('MessageResourceFile') ` -and $MessageResourceFile -ne $currentMessageResourceFile) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'MessageResourceFile', $currentMessageResourceFile, $MessageResourceFile) $inDesiredState = $false } if ($PSBoundParameters.ContainsKey('ParameterResourceFile') ` -and $ParameterResourceFile -ne $currentParameterResourceFile) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'ParameterResourceFile', $currentParameterResourceFile, $ParameterResourceFile) $inDesiredState = $false } } if ($PSBoundParameters.ContainsKey('LogRetentionDays')) { if ($log.IsClassicLog -eq $true -and $LogRetentionDays -ne $currentLogRetentionDays) { Write-Verbose -Message ($script:localizedData.TestTargetResourcePropertyNotInDesiredState ` -f $LogName, 'LogRetentionDays', $currentLogRetentionDays, $LogRetentionDays) $inDesiredState = $false } } return $inDesiredState } <# .SYNOPSIS Gets the requested event log and throws an exception if it doesn't exist. .PARAMETER LogName Specifies the name of a valid event log. #> function Get-WindowsEventLog { [CmdletBinding()] [OutputType([System.Diagnostics.Eventing.Reader.EventLogConfiguration])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName ) try { $log = Get-WinEvent -ListLog $LogName -ErrorAction Stop } catch { $message = $script:localizedData.GetWindowsEventLogFailure -f $LogName New-InvalidOperationException -Message $message -ErrorRecord $_ } return $log } <# .SYNOPSIS Gets the registered event source for an event log. .PARAMETER LogName Specifies the name of a valid event log. .PARAMETER SourceName Specifies the specific event source to retrieve. #> function Get-WindowsEventLogRegisteredSource { [CmdletBinding()] [OutputType([System.String])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter(Mandatory = $true)] [System.String] $SourceName ) $source = '' $logEventSources = Get-CimInstance -Class Win32_NTEventLogFile | Where-Object -Property LogfileName -EQ $LogName | Select-Object -ExpandProperty Sources if ($logEventSources -contains $SourceName) { $source = $SourceName } return $source } <# .SYNOPSIS Gets the full path of a registered event source. .PARAMETER LogName Specifies the name of a valid event log. .PARAMETER SourceName Specifies the specific event source. .PARAMETER ResourceFileType Specifies the resource file type to retrieve. #> function Get-WindowsEventLogRegisteredSourceFile { [CmdletBinding()] [OutputType([System.String])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter(Mandatory = $true)] [AllowEmptyString()] [System.String] $SourceName, [Parameter(Mandatory = $true)] [ValidateSet('Category', 'Message', 'Parameter')] [System.String] $ResourceFileType ) $file = '' if ($SourceName -ne '') { $source = Get-ItemProperty ` -Path "HKLM:\SYSTEM\CurrentControlSet\Services\EventLog\$LogName\$SourceName" ` -ErrorAction SilentlyContinue switch ($ResourceFileType) { 'Category' { if ($null -ne $source.CategoryMessageFile) { $file = $source.CategoryMessageFile } } 'Message' { if ($null -ne $source.EventMessageFile) { $file = $source.EventMessageFile } } 'Parameter' { if ($null -ne $Source.ParameterMessageFile) { $file = $source.ParameterMessageFile } } } } return $file } <# .SYNOPSIS Gets the status of guest access for an event log. .PARAMETER LogName Specifies the name of a valid event log. #> function Get-WindowsEventLogRestrictGuestAccess { [CmdletBinding()] [OutputType([System.Boolean])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName ) $eventLogRegistryPath = 'HKLM:\SYSTEM\CurrentControlSet\Services\EventLog' $logRegistryPath = Join-Path -Path $eventLogRegistryPath -ChildPath $LogName try { $logProperties = Get-ItemProperty -Path $logRegistryPath -ErrorAction Stop } catch { return $false } return ($logProperties.RestrictGuestAccess -eq 1) } <# .SYNOPSIS Gets the retention for an event log and throws an exception if a problem occurs. .PARAMETER LogName Specifies the name of a valid event log. #> function Get-WindowsEventLogRetentionDays { [CmdletBinding()] [OutputType([System.Int32])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName ) $matchingEventLog = Get-EventLog -List | Where-Object -Property Log -EQ $LogName -ErrorAction Stop if ($null -eq $matchingEventLog.MinimumRetentionDays) { $message = $script:localizedData.GetWindowsEventLogRetentionDaysFailure -f $LogName New-InvalidArgumentException -Message $message -ArgumentName 'LogName' } return $matchingEventLog.MinimumRetentionDays } <# .SYNOPSIS Registers an event source and throws an exception if the file path is invalid or registration fails. .PARAMETER LogName Specifies the name of a valid event log. .PARAMETER SourceName Specifies the custom source to add to the Windows Event Log. .PARAMETER CategoryResourceFile Specifies the category resource file to register. .PARAMETER MessageResourceFile Specifies the message resource file to register. .PARAMETER ParameterResourceFile Specifies the parameter resource file to register. #> function Register-WindowsEventLogSource { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter(Mandatory = $true)] [System.String] $SourceName, [Parameter()] [System.String] $CategoryResourceFile, [Parameter()] [System.String] $MessageResourceFile, [Parameter()] [System.String] $ParameterResourceFile ) $arguments = @{ LogName = $LogName Source = $SourceName } if ($PSBoundParameters.ContainsKey('CategoryResourceFile')) { if (-not [System.String]::IsNullOrEmpty($CategoryResourceFile) -and ` -not (Test-Path -Path $CategoryResourceFile -IsValid)) { $message = $script:localizedData.RegisterWindowsEventLogSourceInvalidPath ` -f $SourceName, $CategoryResourceFile New-InvalidArgumentException -Message $message -ArgumentName 'CategoryResourceFile' } $arguments.CategoryResourceFile = $CategoryResourceFile } if ($PSBoundParameters.ContainsKey('MessageResourceFile')) { if (-not [System.String]::IsNullOrEmpty($MessageResourceFile) -and ` -not (Test-Path -Path $MessageResourceFile -IsValid)) { $message = $script:localizedData.RegisterWindowsEventLogSourceInvalidPath ` -f $SourceName, $MessageResourceFile New-InvalidArgumentException -Message $message -ArgumentName 'MessageResourceFile' } $arguments.MessageResourceFile = $MessageResourceFile } if ($PSBoundParameters.ContainsKey('ParameterResourceFile')) { if (-not [System.String]::IsNullOrEmpty($ParameterResourceFile) -and ` -not (Test-Path -Path $ParameterResourceFile -IsValid)) { $message = $script:localizedData.RegisterWindowsEventLogSourceInvalidPath ` -f $SourceName, $ParameterResourceFile New-InvalidArgumentException -Message $message -ArgumentName 'ParameterResourceFile' } $arguments.ParameterResourceFile = $ParameterResourceFile } try { if ((Get-WindowsEventLogRegisteredSource -LogName $LogName -SourceName $SourceName) -eq '') { New-EventLog @arguments -ErrorAction Stop } else { Remove-EventLog -Source $SourceName -ErrorAction Stop New-EventLog @arguments -ErrorAction Stop } } catch { $message = $script:localizedData.RegisterWindowsEventLogSourceFailure -f $LogName, $RegisteredSource New-InvalidOperationException -Message $message -ErrorRecord $_ } } <# .SYNOPSIS Saves changes to an event log and throws an exception if the operation fails. .PARAMETER Log Specifies the given object of a Windows Event Log. #> function Save-WindowsEventLog { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.Diagnostics.Eventing.Reader.EventLogConfiguration] $log ) try { $log.SaveChanges() } catch { $message = $script:localizedData.SaveWindowsEventLogFailure -f $LogName New-InvalidOperationException -Message $message -ErrorRecord $_ } } <# .SYNOPSIS Sets the status of guest access for an event log and throws an exception if the operation fails. .PARAMETER LogName Specifies the name of a valid event log. .PARAMETER RestrictGuestAccess Specifies whether to enable or disable guest access. .PARAMETER Sddl Specifies the SDDL to update. #> function Set-WindowsEventLogRestrictGuestAccess { [CmdletBinding()] [OutputType([System.String])] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter(Mandatory = $true)] [System.Boolean] $RestrictGuestAccess, [Parameter(Mandatory = $true)] [System.String] $Sddl ) $eventLogRegistryPath = 'HKLM:\SYSTEM\CurrentControlSet\Services\EventLog' $logRegistryPath = Join-Path -Path $eventLogRegistryPath -ChildPath $LogName try { Set-ItemProperty -Path $logRegistryPath ` -Name 'RestrictGuestAccess' -Value $RestrictGuestAccess -ErrorAction Stop } catch { $message = $script:localizedData.SetWindowsEventLogRestrictGuestAccessFailure -f $LogName New-InvalidOperationException -Message $message -ErrorRecord $_ } $logSddl = '' $sddlDescriptors = $Sddl.Replace(":", ":`n").Replace(")", ")`n").Split() foreach ($sddlDescriptor in $sddlDescriptors) { if ($sddlDescriptor -notmatch 'BG\)$') { $logSddl += $sddlDescriptor } } if ($RestrictGuestAccess -eq $false) { $logSddl += '(A;;0x1;;;BG)' } return $logSddl } <# .SYNOPSIS Sets retention for an event log and throws an exception if the operation fails. .PARAMETER LogName Specifies the name of a valid event log. .PARAMETER LogMode Specifies the log mode for the specified event log. .PARAMETER LogRetentionDays Specifies the number of days to retain events when the log mode is AutoBackup. #> function Set-WindowsEventLogRetentionDays { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [System.String] $LogName, [Parameter(Mandatory = $true)] [System.String] $LogMode, [Parameter(Mandatory = $true)] [System.Int32] $LogRetentionDays ) if ($LogMode -eq 'AutoBackup') { try { $matchingEventLog = Get-EventLog -List | Where-Object -Property Log -EQ $LogName -ErrorAction Stop } catch { $message = $script:localizedData.GetWindowsEventLogRetentionDaysFailure -f $LogName New-InvalidOperationException -Message $message -ErrorRecord $_ } $minimumRetentionDaysForLog = $matchingEventLog.MinimumRetentionDays if ($LogRetentionDays -ne $minimumRetentionDaysForLog) { try { Limit-EventLog -LogName $LogName ` -OverflowAction 'OverwriteOlder' ` -RetentionDays $LogRetentionDays ` -ErrorAction Stop } catch { $message = $script:localizedData.SetWindowsEventLogRetentionDaysFailure -f $LogName New-InvalidOperationException -Message $message -ErrorRecord $_ } } } else { $message = $script:localizedData.SetWindowsEventLogRetentionDaysWrongMode -f $LogName New-InvalidArgumentException -Message $message -ArgumentName 'LogMode' } } Export-ModuleMember -Function *-TargetResource |