107 lines
4.5 KiB
PowerShell
107 lines
4.5 KiB
PowerShell
function Test-ExternalSharingCalendars {
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[CmdletBinding()]
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[OutputType([CISAuditResult])]
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param (
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# Aligned
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# Parameters can be added if needed
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)
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begin {
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# Dot source the class script if necessary
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#. .\source\Classes\CISAuditResult.ps1
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# Initialization code, if needed
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$recnum = "1.3.3"
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# Conditions for 1.3.3 (L2) Ensure 'External sharing' of calendars is not available (Automated)
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#
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# Validate test for a pass:
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# - Confirm that the automated test results align with the manual audit steps outlined in the CIS benchmark.
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# - Specific conditions to check:
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# - Condition A: In the Microsoft 365 admin center, external calendar sharing is disabled.
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# - Condition B: Using the Exchange Online PowerShell Module, the `OrganizationConfig` property `ExternalSharingEnabled` is set to `False`.
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#
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# Validate test for a fail:
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# - Confirm that the failure conditions in the automated test are consistent with the manual audit results.
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# - Specific conditions to check:
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# - Condition A: In the Microsoft 365 admin center, external calendar sharing is enabled.
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# - Condition B: Using the Exchange Online PowerShell Module, the `OrganizationConfig` property `ExternalSharingEnabled` is set to `True`.
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}
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process {
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try {
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# Step: Retrieve sharing policies related to calendar sharing
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$sharingPolicies = Get-CISExoOutput -Rec $recnum
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# Step (Condition A & B: Pass/Fail): Check if calendar sharing is disabled in all applicable policies
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$isExternalSharingDisabled = $true
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$sharingPolicyDetails = @()
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foreach ($policy in $sharingPolicies) {
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if ($policy.Enabled -eq $true) {
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$isExternalSharingDisabled = $false
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$sharingPolicyDetails += "$($policy.Name): Enabled"
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}
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}
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$failureRemediation = @'
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# Get all mailboxes
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$mailboxes = Get-Mailbox -ResultSize Unlimited
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# Initialize a hashtable to store calendar folder names
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$calendarFolders = @{}
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# Get the default calendar folder names for all mailboxes
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$mailboxes | ForEach-Object {
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$calendarFolderName = [string](Get-EXOMailboxFolderStatistics $_.PrimarySmtpAddress -FolderScope Calendar | Where-Object { $_.FolderType -eq `'Calendar`' }).Name
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$calendarFolders[$_.PrimarySmtpAddress] = $calendarFolderName
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}
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# Get the calendar folder settings for each mailbox
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foreach ($mailbox in $mailboxes) {
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$primarySmtpAddress = $mailbox.PrimarySmtpAddress
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$calendarFolder = $calendarFolders[$primarySmtpAddress]
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# Get users calendar folder settings for their default Calendar folder
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$calendar = Get-MailboxCalendarFolder -Identity "$primarySmtpAddress:\$calendarFolder"
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# Check if calendar publishing is enabled and display a message
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if ($calendar.PublishEnabled) {
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Write-Host -ForegroundColor Yellow "Calendar publishing is enabled for $primarySmtpAddress on $($calendar.PublishedCalendarUrl)"
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}
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}
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'@
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# Step: Prepare failure reasons and details based on compliance (Condition A & B: Fail)
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$failureReasons = if (-not $isExternalSharingDisabled) {
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"Calendar sharing with external users is enabled in one or more policies.`n`n" + `
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"Use the following command to verify which users are sharing calendars prior to disabling:`n`n" + `
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$failureRemediation
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}
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else {
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"N/A"
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}
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# Step: Prepare details for the audit result (Condition A & B: Pass/Fail)
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$details = if ($isExternalSharingDisabled) {
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"Calendar sharing with external users is disabled."
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}
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else {
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"Enabled Sharing Policies: $($sharingPolicyDetails -join ', ')"
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}
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# Step: Create and populate the CISAuditResult object
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$params = @{
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Rec = $recnum
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Result = $isExternalSharingDisabled
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Status = if ($isExternalSharingDisabled) { "Pass" } else { "Fail" }
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Details = $details
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FailureReason = $failureReasons
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}
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$auditResult = Initialize-CISAuditResult @params
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}
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catch {
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$LastError = $_
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$auditResult = Get-TestError -LastError $LastError -recnum $recnum
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}
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}
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end {
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# Return the audit result
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return $auditResult
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}
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}
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