Framework/Helpers/LogAnalyticsHelper.ps1
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Set-StrictMode -Version Latest Class LogAnalyticsHelper{ static [string] $DefaultLAType = "AzSK" hidden static [int] $IsLAWSSettingValid = 0 #-1:Fail (Log Analytics workspace Empty, Log Analytics workspace Return Error) | 1:CA | 0:Local hidden static [int] $IsAltLAWSSettingValid = 0 # Create the function to create and post the request static PostLAWSData([string] $workspaceId, [string] $sharedKey, $body, $logType, $laType) { try { if(($laType | Measure-Object).Count -gt 0 -and [LogAnalyticsHelper]::$("is"+$laType+"SettingValid") -ne -1) { if([string]::IsNullOrWhiteSpace($logType)) { $logType = [LogAnalyticsHelper]::DefaultLAType } [string] $method = "POST" [string] $contentType = "application/json" [string] $resource = "/api/logs" $rfc1123date = [System.DateTime]::UtcNow.ToString("r") [int] $contentLength = $body.Length [string] $signature = [LogAnalyticsHelper]::GetLAWSSignature($workspaceId , $sharedKey , $rfc1123date ,$contentLength ,$method ,$contentType ,$resource) $LADataCollectorAPI = [WebRequestHelper]::GetLADataCollectorAPI() [string] $uri = "https://" + $workspaceId + $LADataCollectorAPI + $resource + "?api-version=2016-04-01" [DateTime] $TimeStampField = [System.DateTime]::UtcNow $headers = @{ "Authorization" = $signature; "Log-Type" = $logType; "x-ms-date" = $rfc1123date; "time-generated-field" = $TimeStampField; } $response = Invoke-WebRequest -Uri $uri -Method $method -ContentType $contentType -Headers $headers -Body $body -UseBasicParsing } } catch { $warningMsg="" if($laType -eq 'LAWS') { switch([LogAnalyticsHelper]::$("is"+$laType+"SettingValid")) { 0 { $warningMsg += "The Log Analytics workspace ID or key is invalid in the local settings file. Use Set-AzSKMonitoringSettings to update either/both with corrected values.";} 1 { $warningMsg += "The Log Analytics workspace ID or key is invalid in the ContinuousAssurance configuration. Use Update-AzSKContinuousAssurance to update either/both with corrected values."; } } [EventBase]::PublishGenericCustomMessage(" `r`nWARNING: $($warningMsg)", [MessageType]::Warning); #Flag to disable Log Analytics scan [LogAnalyticsHelper]::$("is"+$laType+"SettingValid") = -1 } elseif($laType -eq 'AltLAWS') { switch([LogAnalyticsHelper]::$("is"+$laType+"SettingValid")) { 0 { $warningMsg += "The alternate Log Analytics workspace ID or key is invalid in the local settings file. Use Set-AzSKMonitoringSettings to update either/both with corrected values.";} 1 { $warningMsg += "The alternate Log Analytics workspace ID or key is invalid in the ContinuousAssurance configuration. Use Update-AzSKContinuousAssurance to update either/both with corrected values."; } } [EventBase]::PublishGenericCustomMessage(" `r`nWARNING: $($warningMsg)", [MessageType]::Warning); #Flag to disable Log Analytics scan [LogAnalyticsHelper]::$("is"+$laType+"SettingValid") = -1 } } } static [string] GetLAWSSignature ($workspaceId, $sharedKey, $Date, $ContentLength, $Method, $ContentType, $Resource) { [string] $xHeaders = "x-ms-date:" + $Date [string] $stringToHash = $Method + "`n" + $ContentLength + "`n" + $ContentType + "`n" + $xHeaders + "`n" + $Resource [byte[]]$bytesToHash = [Text.Encoding]::UTF8.GetBytes($stringToHash) [byte[]]$keyBytes = [Convert]::FromBase64String($sharedKey) [System.Security.Cryptography.HMACSHA256] $sha256 = New-Object System.Security.Cryptography.HMACSHA256 $sha256.Key = $keyBytes [byte[]]$calculatedHash = $sha256.ComputeHash($bytesToHash) $encodedHash = [Convert]::ToBase64String($calculatedHash) $authorization = 'SharedKey {0}:{1}' -f $workspaceId,$encodedHash return $authorization } static [PSObject[]] GetLAWSBodyObjects([SVTEventContext] $eventContext,[AzSKContextDetails] $AzSKContext) { [PSObject[]] $output = @(); # Here we are utilizing the RG tag mapping that is done while sending the ResourceInventory telemetry event. # Hence, this works only when scan source is 'CA' if (([FeatureFlightingManager]::GetFeatureStatus("EnableResourceGroupTagTelemetry", "*") -eq $true) ` -and (([ResourceInventory]::ResourcesWithTagMapping | Measure-Object).Count -gt 0) ` -and ($eventContext.IsResource())) { try { $resourceTag = [ResourceInventory]::ResourcesWithTagMapping | Where-Object { $_.ResourceId -eq $($eventContext.ResourceContext.ResourceId) } if (($resourceTag | Measure-Object).Count -eq 1) { $eventContext.ResourceContext.ResourceGroupTags = @{ "Env" = $($resourceTag.RGEnv) ; "ComponentID" = $($resourceTag.RGComponentID) }; } } catch { # Exception occurred during setting tag. This is kept blank intentionaly to avoid flow break } } [array] $eventContext.ControlResults | ForEach-Object{ Set-Variable -Name ControlResult -Value $_ -Scope Local $out = [LAWSModel]::new() if($eventContext.IsResource()) { $out.ResourceType=$eventContext.ResourceContext.ResourceType $out.ResourceGroup=$eventContext.ResourceContext.ResourceGroupName $out.ResourceName=$eventContext.ResourceContext.ResourceName $out.ResourceId = $eventContext.ResourceContext.ResourceId $out.ChildResourceName=$ControlResult.ChildResourceName $out.PartialScanIdentifier=$eventContext.PartialScanIdentifier #Send Log Analytics workspace telmetry for RG tags if feature is enabled and resource group tags are available try{ if ([FeatureFlightingManager]::GetFeatureStatus("EnableResourceGroupTagTelemetry","*") -eq $true -and $eventContext.ResourceContext.ResourceGroupTags.Count -gt 0) { # Try catch block for Env and ComponentId tags if tags throws exceptions in case of null objects try { $out.Env = $eventContext.ResourceContext.ResourceGroupTags[$eventContext.ResourceContext.ResourceGroupTags.Keys -match "\benv\b"] } catch { $out.Env = [string]::Empty; } try { $out.ComponentId = $eventContext.ResourceContext.ResourceGroupTags[$eventContext.ResourceContext.ResourceGroupTags.Keys -match "\bcomponentid\b"] } catch{ $out.ComponentId = [string]::Empty } } } catch{ #Execution should not break if any excepiton in case of tag telemetry logging. <TODO: Add exception telemetry> } } $out.Env = [AzSKSettings]::GetInstance().GetScanSource(); $out.Reference=$eventContext.Metadata.Reference $out.ControlStatus=$ControlResult.VerificationResult.ToString() $out.ActualVerificationResult=$ControlResult.ActualVerificationResult.ToString() $out.ControlId=$eventContext.ControlItem.ControlID $out.SubscriptionName=$eventContext.SubscriptionContext.SubscriptionName $out.SubscriptionId=$eventContext.SubscriptionContext.SubscriptionId $out.FeatureName=$eventContext.FeatureName $out.Recommendation=$eventContext.ControlItem.Recommendation $out.ControlSeverity=$eventContext.ControlItem.ControlSeverity.ToString() $out.Source=$AzSKContext.Source $out.Tags=$eventContext.ControlItem.Tags $out.RunIdentifier = $AzSKContext.RunIdentifier $out.HasRequiredAccess = $ControlResult.CurrentSessionContext.Permissions.HasRequiredAccess $out.ScannerVersion = $AzSKContext.Version $out.IsBaselineControl = $eventContext.ControlItem.IsBaselineControl #addPreviewBaselineControl Flag $out.IsPreviewBaselineControl = $eventContext.ControlItem.IsPreviewBaselineControl $out.HasAttestationWritePermissions = $ControlResult.CurrentSessionContext.Permissions.HasAttestationWritePermissions $out.HasAttestationReadPermissions = $ControlResult.CurrentSessionContext.Permissions.HasAttestationReadPermissions $out.IsLatestPSModule = $ControlResult.CurrentSessionContext.IsLatestPSModule $out.PolicyOrgName = $AzSKContext.PolicyOrgName $out.IsControlInGrace = $ControlResult.IsControlInGrace $out.ScannedBy=[ContextHelper]::GetCurrentSessionUser() #mapping the attestation properties if($null -ne $ControlResult -and $null -ne $ControlResult.StateManagement -and $null -ne $ControlResult.StateManagement.AttestedStateData) { $attestedData = $ControlResult.StateManagement.AttestedStateData; $out.AttestationStatus = $ControlResult.AttestationStatus.ToString(); $out.AttestedBy = $attestedData.AttestedBy; $out.Justification = $attestedData.Justification; $out.AttestedDate = $attestedData.AttestedDate $out.ExpiryDate = $attestedData.ExpiryDate } $output += $out } return $output } static [void] PostApplicableControlSet([SVTEventContext[]] $contexts,[AzSKContextDetails] $AzSKContext) { if (($contexts | Measure-Object).Count -lt 1) { return; } $set = [LogAnalyticsHelper]::ConvertToSimpleSet($contexts,$AzSKContext); [LogAnalyticsHelper]::WriteControlResult($set,"AzSK_Inventory") } static [void] WriteControlResult([PSObject[]] $lawsDataObject, [string] $laEventType) { try { $settings = [ConfigurationManager]::GetAzSKSettings() if([string]::IsNullOrWhiteSpace($laEventType)) { $laEventType = $settings.LAType } if((-not [string]::IsNullOrWhiteSpace($settings.LAWSId)) -or (-not [string]::IsNullOrWhiteSpace($settings.AltLAWSId))) { $lawsDataObject | ForEach-Object{ Set-Variable -Name tempBody -Value $_ -Scope Local $body = $tempBody | ConvertTo-Json $lawsBodyByteArray = ([System.Text.Encoding]::UTF8.GetBytes($body)) #publish to primary workspace if(-not [string]::IsNullOrWhiteSpace($settings.LAWSId) -and [LogAnalyticsHelper]::IsLAWSSettingValid -ne -1) { [LogAnalyticsHelper]::PostLAWSData($settings.LAWSId, $settings.LAWSSharedKey, $lawsBodyByteArray, $laEventType, 'LAWS') } #publish to secondary workspace if(-not [string]::IsNullOrWhiteSpace($settings.AltLAWSId) -and [LogAnalyticsHelper]::IsAltLAWSSettingValid -ne -1) { [LogAnalyticsHelper]::PostLAWSData($settings.AltLAWSId, $settings.AltLAWSSharedKey, $lawsBodyByteArray, $laEventType, 'AltLAWS') } } } } catch { throw ([SuppressedException]::new("Error sending events to Log Analytics. The following exception occurred: `r`n$($_.Exception.Message) `r`nFor more on AzSK Log Analytics workspace setup, refer: https://aka.ms/devopskit/ca")); } } static [PSObject[]] ConvertToSimpleSet($contexts,[AzSKContextDetails] $AzSKContext) { $ControlSet = [System.Collections.ArrayList]::new() foreach ($item in $contexts) { $set = [LAWSResourceInvModel]::new() $set.RunIdentifier = $AzSKContext.RunIdentifier $set.SubscriptionId = $item.SubscriptionContext.SubscriptionId $set.SubscriptionName = $item.SubscriptionContext.SubscriptionName $set.Source = $AzSKContext.Source $set.ScannerVersion = $AzSKContext.Version $set.FeatureName = $item.FeatureName if([Helpers]::CheckMember($item,"ResourceContext")) { $set.ResourceGroupName = $item.ResourceContext.ResourceGroupName $set.ResourceName = $item.ResourceContext.ResourceName $set.ResourceId = $item.ResourceContext.ResourceId } $set.ControlIntId = $item.ControlItem.Id $set.ControlId = $item.ControlItem.ControlID $set.ControlSeverity = $item.ControlItem.ControlSeverity $set.Tags = $item.ControlItem.Tags $set.IsBaselineControl = $item.ControlItem.IsBaselineControl #add PreviewBaselineFlag $set.IsPreviewBaselineControl = $item.ControlItem.IsPreviewBaselineControl $ControlSet.Add($set) } return $ControlSet; } static [void] SetLAWSDetails() { #Check if Settings already contain details of Log Analytics workspace $settings = [ConfigurationManager]::GetAzSKSettings() #Can we add one flag in 'AzSKSettings' or 'ControlSettings.json' to control this #Step 1: if Log Analytics workspace details are not present on machine if([string]::IsNullOrWhiteSpace($settings.LAWSId) -or [string]::IsNullOrWhiteSpace($settings.AltLAWSId)) { $rgName = [ConfigurationManager]::GetAzSKConfigData().AzSKRGName #Step 2: Validate if CA is enabled on subscription $automationAccDetails = $null #$automationAccDetails= Get-AzAutomationAccount -ResourceGroupName $rgName -ErrorAction SilentlyContinue if($automationAccDetails) { if([string]::IsNullOrWhiteSpace($settings.LAWSId)) { #Step 3: Get workspace id from automation account variables #Try getting the values from the LAWS variables, if they don't exist, read value from OMS variables $laWSId = Get-AzAutomationVariable -ResourceGroupName $automationAccDetails.ResourceGroupName -AutomationAccountName $automationAccDetails.AutomationAccountName -Name "LAWSId" -ErrorAction SilentlyContinue if(($laWSId | Measure-Object).Count -eq 0) { $laWSId = Get-AzAutomationVariable -ResourceGroupName $automationAccDetails.ResourceGroupName -AutomationAccountName $automationAccDetails.AutomationAccountName -Name "OMSWorkspaceId" -ErrorAction SilentlyContinue } #Step 4: set workspace id and shared key in setting file if($laWSId) { $laWSSharedKey = Get-AzAutomationVariable -ResourceGroupName $automationAccDetails.ResourceGroupName -AutomationAccountName $automationAccDetails.AutomationAccountName -Name "LAWSSharedKey" -ErrorAction SilentlyContinue if(($laWSSharedKey | Measure-Object).Count -eq 0) { $laWSSharedKey = Get-AzAutomationVariable -ResourceGroupName $automationAccDetails.ResourceGroupName -AutomationAccountName $automationAccDetails.AutomationAccountName -Name "OMSSharedKey" } if([Helpers]::CheckMember($laWSSharedKey,"Value") -and (-not [string]::IsNullOrWhiteSpace($laWSSharedKey.Value))) { #Step 6: Assign it to AzSKSettings Object $settings.LAWSId = $laWSId.Value $settings.LAWSSharedKey = $laWSSharedKey.Value [LogAnalyticsHelper]::IsLAWSSettingValid = 1 } } } if([string]::IsNullOrWhiteSpace($settings.LAWSId) -or [string]::IsNullOrWhiteSpace($settings.LAWSSharedKey)) { [LogAnalyticsHelper]::IsLAWSSettingValid = -1 } if([string]::IsNullOrWhiteSpace($settings.AltLAWSId)) { #Step 3: Get alternate workspace id from automation account variables #Try getting the values from the LAWS variables, if they don't exist, read value from OMS variables $altLAWSId = Get-AzAutomationVariable -ResourceGroupName $automationAccDetails.ResourceGroupName -AutomationAccountName $automationAccDetails.AutomationAccountName -Name "AltLAWSId" -ErrorAction SilentlyContinue if(($altLAWSId | Measure-Object).Count -eq 0) { $altLAWSId = Get-AzAutomationVariable -ResourceGroupName $automationAccDetails.ResourceGroupName -AutomationAccountName $automationAccDetails.AutomationAccountName -Name "AltOMSWorkspaceId" -ErrorAction SilentlyContinue } #Step 4: set alternate workspace id and shared key in setting file if($altLAWSId) { $altLAWSSharedKey = Get-AzAutomationVariable -ResourceGroupName $automationAccDetails.ResourceGroupName -AutomationAccountName $automationAccDetails.AutomationAccountName -Name "AltLAWSSharedKey" -ErrorAction SilentlyContinue if(($altLAWSSharedKey | Measure-Object).Count -eq 0) { $altLAWSSharedKey = Get-AzAutomationVariable -ResourceGroupName $automationAccDetails.ResourceGroupName -AutomationAccountName $automationAccDetails.AutomationAccountName -Name "AltOMSSharedKey" } if([Helpers]::CheckMember($altLAWSSharedKey,"Value") -and (-not [string]::IsNullOrWhiteSpace($altLAWSSharedKey.Value))) { #Step 6: Assign it to AzSKSettings Object $settings.AltLAWSId = $altLAWSId.Value $settings.AltLAWSSharedKey = $altLAWSSharedKey.Value [LogAnalyticsHelper]::IsAltLAWSSettingValid = 1 } } } if([string]::IsNullOrWhiteSpace($settings.AltLAWSId) -or [string]::IsNullOrWhiteSpace($settings.AltLAWSSharedKey)) { [LogAnalyticsHelper]::IsAltLAWSSettingValid = -1 } } } } static PostResourceInventory([AzSKContextDetails] $AzSKContext) { if($AzSKContext.Source.Equals("CC", [System.StringComparison]::OrdinalIgnoreCase) -or $AzSKContext.Source.Equals("CA", [System.StringComparison]::OrdinalIgnoreCase)){ $resourceSet = [System.Collections.ArrayList]::new() [ResourceInventory]::FetchResources(); foreach($resource in [ResourceInventory]::FilteredResources){ $set = [LAWSResourceModel]::new() $set.RunIdentifier = $AzSKContext.RunIdentifier $set.SubscriptionId = $resource.SubscriptionId #$set.SubscriptionName = $item.SubscriptionContext.SubscriptionName $set.Source = $AzSKContext.Source $set.ScannerVersion = $AzSKContext.Version $set.ResourceType = $resource.ResourceType $set.ResourceGroupName = $resource.ResourceGroupName $set.ResourceName = $resource.Name $set.ResourceId = $resource.ResourceId $resourceSet.Add($set) } [LogAnalyticsHelper]::WriteControlResult($resourceSet,"AzSK_Inventory") $laMetadata = [ConfigurationManager]::LoadServerConfigFile("LogAnalyticsSettings.json") [LogAnalyticsHelper]::WriteControlResult($laMetadata,"AzSK_MetaData") } } hidden static [PSObject] QueryStatusfromWorkspace([string] $workspaceId,[string] $query) { $result=$null; try { $body = @{query=$query}; $url="https://api.loganalytics.io/v1/workspaces/" +$workspaceId+"/query" $response=[WebRequestHelper]::InvokePostWebRequest($url , $body); # Formating the response obtained from querying workspace. if(($response | Measure-Object).Count -gt 0) { $data = $response; #Out of four tables obtained, the first table contains result of query if(($data | Measure-Object).Count -gt 0) { $table= $data.Tables[0]; $Columns=$table.Columns; $objectView = @{}; $j = 0; if($null -ne $table) { foreach ($valuetable in $table) { foreach ($row in $table.Rows) { #If timestamp/first column value is null means row is empty if($row[0]) { $i = 0; $count=$valuetable.Columns.Count; $properties = @{} foreach($col in $Columns) { if($i -lt $count) { $properties[$col.Name] = $row[$i]; } $i++; } $objectView[$j] = (New-Object PSObject -Property $properties) $j++; } } } $result=$objectView; } } } } catch { [EventBase]::PublishGenericCustomMessage($_) } return $result; } } Class LAWSModel { [string] $RunIdentifier [string] $ResourceType [string] $ResourceGroup [string] $Reference [string] $ResourceName [string] $ChildResourceName [string] $ResourceId [string] $ControlStatus [string] $ActualVerificationResult [string] $ControlId [string] $SubscriptionName [string] $SubscriptionId [string] $FeatureName [string] $Source [string] $Recommendation [string] $ControlSeverity [string] $TimeTakenInMs [string] $AttestationStatus [string] $AttestedBy [string] $Justification [string] $AttestedDate [bool] $HasRequiredAccess [bool] $HasAttestationWritePermissions [bool] $HasAttestationReadPermissions [bool] $IsLatestPSModule [bool] $IsControlInGrace [string[]] $Tags [string] $ScannerVersion [bool] $IsBaselineControl #add PreviewBaselineFlag [bool] $IsPreviewBaselineControl [string] $ExpiryDate [string] $PartialScanIdentifier [string] $PolicyOrgName [string] $ScannedBy [string] $Env [string] $ComponentId } Class LAWSResourceInvModel{ [string] $RunIdentifier [string] $SubscriptionId [string] $SubscriptionName [string] $Source [string] $ScannerVersion [string] $FeatureName [string] $ResourceGroupName [string] $ResourceName [string] $ResourceId [string] $ControlId [string] $ControlIntId [string] $ControlSeverity [string[]] $Tags [bool] $IsBaselineControl #add PreviewBaselineFlag [bool] $IsPreviewBaselineControl } Class LAWSResourceModel{ [string] $RunIdentifier [string] $SubscriptionId [string] $Source [string] $ScannerVersion [string] $ResourceType [string] $ResourceGroupName [string] $ResourceName [string] $ResourceId } Class AzSKContextDetails { [string] $RunIdentifier [string] $Version [string] $Source [string] $PolicyOrgName } Class CommandModel{ [string] $EventName [string] $RunIdentifier [string] $PartialScanIdentifier [string] $ModuleVersion [string] $MethodName [string] $ModuleName [string] $Parameters [string] $SubscriptionId [string] $SubscriptionName } class CredHygieneAlert{ [int] $ExpiryDueInDays [bool] $IsExpired [string] $CredentialName [string] $CredentialGroup [string] $LastUpdatedBy [string] $SubscriptionId [string] $SubscriptionName } |