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