tests/Test-BlockMailForwarding.ps1
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function Test-BlockMailForwarding { [CmdletBinding()] [OutputType([CISAuditResult])] param ( # Parameters can be added if needed ) begin { # Dot source the class script if necessary #. .\source\Classes\CISAuditResult.ps1 # Initialization code, if needed $recnum = "6.2.1" <# Conditions for 6.2.1 (L1) Ensure all forms of mail forwarding are blocked and/or disabled Validate test for a pass: - Confirm that the automated test results align with the manual audit steps outlined in the CIS benchmark. - Specific conditions to check: - Condition A: Transport rules do not forward email to external domains. - Condition B: Anti-spam outbound policy is configured to disable automatic email forwarding to external domains. - Condition C: No exceptions to the forwarding rules unless explicitly defined by organizational policy. Validate test for a fail: - Confirm that the failure conditions in the automated test are consistent with the manual audit results. - Specific conditions to check: - Condition A: One or more transport rules forward email to external domains. - Condition B: Anti-spam outbound policy does not disable automatic email forwarding to external domains. - Condition C: Unapproved exceptions to the forwarding rules are present. #> } process { try { # 6.2.1 (L1) Ensure all forms of mail forwarding are blocked and/or disabled # Step 1: Retrieve the transport rules that redirect messages $transportRules = Get-TransportRule | Where-Object { $null -ne $_.RedirectMessageTo } $transportForwardingBlocked = $transportRules.Count -eq 0 # Step 2: Check all anti-spam outbound policies $outboundSpamPolicies = Get-HostedOutboundSpamFilterPolicy $nonCompliantSpamPolicies = $outboundSpamPolicies | Where-Object { $_.AutoForwardingMode -ne 'Off' } $nonCompliantSpamPoliciesArray = @($nonCompliantSpamPolicies) $spamForwardingBlocked = $nonCompliantSpamPoliciesArray.Count -eq 0 # Determine overall compliance $forwardingBlocked = $transportForwardingBlocked -and $spamForwardingBlocked # Prepare failure reasons and details based on compliance $failureReasons = @() $details = @() if ($transportRules.Count -gt 0) { # Fail Condition A $failureReasons += "Mail forwarding rules found: $($transportRules.Name -join ', ')" $details += "Transport Rules Details:`nRule Name|Redirects To" $details += $transportRules | ForEach-Object { "$($_.Name)|$($_.RedirectMessageTo -join ', ')" } $details += "`n" } if ($nonCompliantSpamPoliciesArray.Count -gt 0) { # Fail Condition B $failureReasons += "Outbound spam policies allowing automatic forwarding found." $details += "Policy|AutoForwardingMode" $details += $nonCompliantSpamPoliciesArray | ForEach-Object { "$($_.Name)|$($_.AutoForwardingMode)" } } if ($failureReasons.Count -eq 0) { $failureReasons = "N/A" $details = "Both transport rules and outbound spam policies are configured correctly to block forwarding." } else { $failureReasons = $failureReasons -join " | " $details = $details -join "`n" } # Populate the audit result $params = @{ Rec = $recnum Result = $forwardingBlocked Status = if ($forwardingBlocked) { "Pass" } else { "Fail" } Details = $details FailureReason = $failureReasons } $auditResult = Initialize-CISAuditResult @params } catch { Write-Error "An error occurred during the test: $_" # Retrieve the description from the test definitions $testDefinition = $script:TestDefinitionsObject | Where-Object { $_.Rec -eq $recnum } $description = if ($testDefinition) { $testDefinition.RecDescription } else { "Description not found" } $script:FailedTests.Add([PSCustomObject]@{ Rec = $recnum; Description = $description; Error = $_ }) # Call Initialize-CISAuditResult with error parameters $auditResult = Initialize-CISAuditResult -Rec $recnum -Failure } } end { # Return the audit result return $auditResult } } |