298 lines
15 KiB
PowerShell
298 lines
15 KiB
PowerShell
<#
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.SYNOPSIS
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This is a sample Private function only visible within the module.
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.DESCRIPTION
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This sample function is not exported to the module and only return the data passed as parameter.
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.EXAMPLE
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$null = Get-CISExoOutput -PrivateData 'NOTHING TO SEE HERE'
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.PARAMETER PrivateData
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The PrivateData parameter is what will be returned without transformation.
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#>
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function Get-CISExoOutput {
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[cmdletBinding()]
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param(
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[Parameter(Mandatory = $true)]
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[String]$Rec
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)
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begin {
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# Begin Block #
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<#
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# Tests
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1.2.2
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1.3.3
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1.3.6
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2.1.1
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2.1.2
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2.1.3
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2.1.4
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2.1.5
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2.1.6
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2.1.7
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2.1.9
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3.1.1
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6.1.1
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6.1.2
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6.1.3
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6.2.1
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6.2.2
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6.2.3
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6.3.1
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6.5.1
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6.5.2
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6.5.3
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8.6.1
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# Test number array
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$testNumbers = @('1.2.2', '1.3.3', '1.3.6', '2.1.1', '2.1.2', '2.1.3', '2.1.4', '2.1.5', '2.1.6', '2.1.7', '2.1.9', '3.1.1', '6.1.1', '6.1.2', '6.1.3', '6.2.1', '6.2.2', '6.2.3', '6.3.1', '6.5.1', '6.5.2', '6.5.3', '8.6.1')
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#>
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}
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process {
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Write-Verbose "Get-CISExoOutput: Retuning data for Rec: $Rec"
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switch ($Rec) {
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'1.2.2' {
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# Test-BlockSharedMailboxSignIn.ps1
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$MBX = Get-EXOMailbox -RecipientTypeDetails SharedMailbox
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# [object[]]
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return $MBX
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}
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'1.3.3' {
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# Test-ExternalSharingCalendars.ps1
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# Step: Retrieve sharing policies related to calendar sharing
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$sharingPolicies = Get-SharingPolicy | Where-Object { $_.Domains -like '*CalendarSharing*' }
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# [psobject[]]
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return $sharingPolicies
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}
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'1.3.6' {
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# Test-CustomerLockbox.ps1
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# Step: Retrieve the organization configuration (Condition C: Pass/Fail)
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$orgConfig = Get-OrganizationConfig | Select-Object CustomerLockBoxEnabled
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$customerLockboxEnabled = $orgConfig.CustomerLockBoxEnabled
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# [bool]
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return $customerLockboxEnabled
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}
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'2.1.1' {
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# Test-SafeLinksOfficeApps.ps1
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if (Get-Command Get-SafeLinksPolicy -ErrorAction SilentlyContinue) {
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# 2.1.1 (L2) Ensure Safe Links for Office Applications is Enabled
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# Retrieve all Safe Links policies
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$policies = Get-SafeLinksPolicy
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# Initialize the details collection
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$misconfiguredDetails = @()
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foreach ($policy in $policies) {
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# Get the detailed configuration of each policy
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$policyDetails = Get-SafeLinksPolicy -Identity $policy.Name
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# Check each required property and record failures
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# Condition A: Checking policy settings
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$failures = @()
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if ($policyDetails.EnableSafeLinksForEmail -ne $true) { $failures += "EnableSafeLinksForEmail: False" } # Email: On
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if ($policyDetails.EnableSafeLinksForTeams -ne $true) { $failures += "EnableSafeLinksForTeams: False" } # Teams: On
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if ($policyDetails.EnableSafeLinksForOffice -ne $true) { $failures += "EnableSafeLinksForOffice: False" } # Office 365 Apps: On
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if ($policyDetails.TrackClicks -ne $true) { $failures += "TrackClicks: False" } # Click protection settings: On
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if ($policyDetails.AllowClickThrough -ne $false) { $failures += "AllowClickThrough: True" } # Do not track when users click safe links: Off
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# Only add details for policies that have misconfigurations
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if ($failures.Count -gt 0) {
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$misconfiguredDetails += "Policy: $($policy.Name); Failures: $($failures -join ', ')"
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}
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}
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# [object[]]
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return $misconfiguredDetails
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}
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else {
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return 1
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}
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}
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'2.1.2' {
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# Test-CommonAttachmentFilter.ps1
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# 2.1.2 (L1) Ensure the Common Attachment Types Filter is enabled
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# Condition A: The Common Attachment Types Filter is enabled in the Microsoft 365 Security & Compliance Center.
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# Condition B: Using Exchange Online PowerShell, verify that the `EnableFileFilter` property of the default malware filter policy is set to `True`.
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# Retrieve the attachment filter policy
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$attachmentFilter = Get-MalwareFilterPolicy -Identity Default | Select-Object EnableFileFilter
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$result = $attachmentFilter.EnableFileFilter
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# [bool]
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return $result
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}
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'2.1.3' {
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# Test-NotifyMalwareInternal.ps1
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# 2.1.3 Ensure notifications for internal users sending malware is Enabled
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# Retrieve all 'Custom' malware filter policies and check notification settings
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$malwareNotifications = Get-MalwareFilterPolicy | Where-Object { $_.RecommendedPolicyType -eq 'Custom' }
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# [object[]]
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return $malwareNotifications
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}
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'2.1.4' {
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# Test-SafeAttachmentsPolicy.ps1
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if (Get-Command Get-SafeAttachmentPolicy -ErrorAction SilentlyContinue) {
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# Retrieve all Safe Attachment policies where Enable is set to True
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# Check if ErrorAction needed below
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$safeAttachmentPolicies = Get-SafeAttachmentPolicy -ErrorAction SilentlyContinue | Where-Object { $_.Enable -eq $true }
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# [object[]]
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return $safeAttachmentPolicies
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else {
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return 1
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}
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}
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}
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'2.1.5' {
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# Test-SafeAttachmentsTeams.ps1
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if (Get-Command Get-AtpPolicyForO365 -ErrorAction SilentlyContinue) {
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# 2.1.5 (L2) Ensure Safe Attachments for SharePoint, OneDrive, and Microsoft Teams is Enabled
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# Retrieve the ATP policies for Office 365 and check Safe Attachments settings
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$atpPolicies = Get-AtpPolicyForO365
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# Check if the required ATP policies are enabled
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$atpPolicyResult = $atpPolicies | Where-Object {
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$_.EnableATPForSPOTeamsODB -eq $true -and
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$_.EnableSafeDocs -eq $true -and
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$_.AllowSafeDocsOpen -eq $false
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}
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# [psobject[]]
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return $atpPolicyResult
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}
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else {
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return 1
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}
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}
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'2.1.6' {
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# Test-SpamPolicyAdminNotify.ps1
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# Retrieve the default hosted outbound spam filter policy
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$hostedOutboundSpamFilterPolicy = Get-HostedOutboundSpamFilterPolicy | Where-Object { $_.IsDefault -eq $true }
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return $hostedOutboundSpamFilterPolicy
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}
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'2.1.7' {
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# Test-AntiPhishingPolicy.ps1
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# Condition A: Ensure that an anti-phishing policy has been created
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$antiPhishPolicies = Get-AntiPhishPolicy
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return $antiPhishPolicies
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}
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'2.1.9' {
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# Test-EnableDKIM.ps1
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# 2.1.9 (L1) Ensure DKIM is enabled for all Exchange Online Domains
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# Retrieve DKIM configuration for all domains
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$dkimConfig = Get-DkimSigningConfig | Select-Object Domain, Enabled
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# [object[]]
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return $dkimConfig
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}
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'3.1.1' {
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# Test-AuditLogSearch.ps1
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# 3.1.1 (L1) Ensure Microsoft 365 audit log search is Enabled
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# Retrieve the audit log configuration
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$auditLogConfig = Get-AdminAuditLogConfig | Select-Object UnifiedAuditLogIngestionEnabled
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#
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$auditLogResult = $auditLogConfig.UnifiedAuditLogIngestionEnabled
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# [bool]
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return $auditLogResult
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}
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'6.1.1' {
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# Test-AuditDisabledFalse.ps1
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# 6.1.1 (L1) Ensure 'AuditDisabled' organizationally is set to 'False'
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# Retrieve the AuditDisabled configuration (Condition B)
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$auditDisabledConfig = Get-OrganizationConfig | Select-Object AuditDisabled
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# [bool]
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$auditNotDisabled = -not $auditDisabledConfig.AuditDisabled
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return $auditNotDisabled
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}
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'6.1.2' {
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# Test-MailboxAuditingE3.ps1
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$mailboxes = Get-EXOMailbox -PropertySets Audit
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# [object[]]
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return $mailboxes
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}
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'6.1.3' {
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# Test-MailboxAuditingE5.ps1
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$mailboxes = Get-EXOMailbox -PropertySets Audit
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# [object[]]
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return $mailboxes
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}
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'6.2.1' {
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# Test-BlockMailForwarding.ps1
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# 6.2.1 (L1) Ensure all forms of mail forwarding are blocked and/or disabled
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# Step 1: Retrieve the transport rules that redirect messages
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$transportRules = Get-TransportRule | Where-Object { $null -ne $_.RedirectMessageTo }
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if ($null -eq $transportRules) {
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$transportRules = 1
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}
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# Step 2: Check all anti-spam outbound policies
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$outboundSpamPolicies = Get-HostedOutboundSpamFilterPolicy
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$nonCompliantSpamPolicies = $outboundSpamPolicies | Where-Object { $_.AutoForwardingMode -ne 'Off' }
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return $transportRules, $nonCompliantSpamPolicies
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}
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'6.2.2' {
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# Test-NoWhitelistDomains.ps1
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# 6.2.2 (L1) Ensure mail transport rules do not whitelist specific domains
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# Retrieve transport rules that whitelist specific domains
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# Condition A: Checking for transport rules that whitelist specific domains
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# [object[]]
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$whitelistedRules = Get-TransportRule | Where-Object { $_.SetSCL -eq -1 -and $null -ne $_.SenderDomainIs }
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return $whitelistedRules
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}
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'6.2.3' {
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# Test-IdentifyExternalEmail.ps1
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# 6.2.3 (L1) Ensure email from external senders is identified
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# Retrieve external sender tagging configuration
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# [object[]]
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$externalInOutlook = Get-ExternalInOutlook
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return $externalInOutlook
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}
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'6.3.1' {
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# Test-RestrictOutlookAddins.ps1
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# 6.3.1 (L2) Ensure users installing Outlook add-ins is not allowed
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$customPolicyFailures = @()
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# Check all mailboxes for custom policies with unallowed add-ins
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$roleAssignmentPolicies = Get-EXOMailbox | Select-Object -Unique RoleAssignmentPolicy
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if ($roleAssignmentPolicies.RoleAssignmentPolicy) {
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foreach ($policy in $roleAssignmentPolicies) {
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if ($policy.RoleAssignmentPolicy) {
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$rolePolicyDetails = Get-RoleAssignmentPolicy -Identity $policy.RoleAssignmentPolicy
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$foundRoles = $rolePolicyDetails.AssignedRoles | Where-Object { $_ -in $relevantRoles }
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# Condition B: Using PowerShell, verify that MyCustomApps, MyMarketplaceApps, and MyReadWriteMailboxApps are not assigned to users.
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if ($foundRoles) {
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$customPolicyFailures += "Policy: $($policy.RoleAssignmentPolicy): Roles: $($foundRoles -join ', ')"
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}
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}
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}
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}
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# Check Default Role Assignment Policy
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$defaultPolicy = Get-RoleAssignmentPolicy "Default Role Assignment Policy"
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return $customPolicyFailures, $defaultPolicy
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}
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'6.5.1' {
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# Test-ModernAuthExchangeOnline.ps1
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# Ensuring the ExchangeOnlineManagement module is available
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# 6.5.1 (L1) Ensure modern authentication for Exchange Online is enabled
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# Check modern authentication setting in Exchange Online configuration (Condition A and B)
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$orgConfig = Get-OrganizationConfig | Select-Object -Property Name, OAuth2ClientProfileEnabled
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return $orgConfig
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}
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'6.5.2' {
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# Test-MailTipsEnabled.ps1
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# 6.5.2 (L2) Ensure MailTips are enabled for end users
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# Retrieve organization configuration for MailTips settings
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# [object]
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$orgConfig = Get-OrganizationConfig | Select-Object MailTipsAllTipsEnabled, MailTipsExternalRecipientsTipsEnabled, MailTipsGroupMetricsEnabled, MailTipsLargeAudienceThreshold
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return $orgConfig
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}
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'6.5.3' {
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# Test-RestrictStorageProvidersOutlook.ps1
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# 6.5.3 (L2) Ensure additional storage providers are restricted in Outlook on the web
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# Retrieve all OwaMailbox policies
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# [object[]]
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$owaPolicies = Get-OwaMailboxPolicy
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return $owaPolicies
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}
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'8.6.1' {
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# Test-ReportSecurityInTeams.ps1
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# 8.6.1 (L1) Ensure users can report security concerns in Teams
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# Retrieve the necessary settings for Teams and Exchange Online
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# Condition B: Verify that 'Monitor reported messages in Microsoft Teams' is checked in the Microsoft 365 Defender portal.
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# Condition C: Ensure the 'Send reported messages to' setting in the Microsoft 365 Defender portal is set to 'My reporting mailbox only' with the correct report email addresses.
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$ReportSubmissionPolicy = Get-ReportSubmissionPolicy | Select-Object -Property ReportJunkToCustomizedAddress, ReportNotJunkToCustomizedAddress, ReportPhishToCustomizedAddress,ReportJunkAddresses,ReportNotJunkAddresses,ReportPhishAddresses,ReportChatMessageEnabled,ReportChatMessageToCustomizedAddressEnabled
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return $ReportSubmissionPolicy
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}
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default { throw "No match found for test: $Rec" }
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}
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}
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end {
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Write-Verbose "Retuning data for Rec: $Rec"
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}
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} # end function Get-CISExoOutput
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