💼 Management Samenvatting
Deze security regelen waarborgt de correcte configuratie van beveiligingsinstellingen op Windows endpoints.
Aanbeveling
IMPLEMENT
Risico zonder
High
Risk Score
7/10
Implementatie
2u (tech: 1u)
Van toepassing op:
✓ Windows
Deze instelling is onderdeel van de Windows security baseline en beschermt tegen bekende aanvalsvectoren door het afdwingen van veilige configuraties.
PowerShell Modules Vereist
Primary API: Graph
Connection:
Required Modules: Microsoft.Graph.DeviceManagement
Connection:
Connect-MgGraphRequired Modules: Microsoft.Graph.DeviceManagement
Implementatie
Dit regelen configureert external calendar sharing disabled via Microsoft Intune apparaat configuratie beleid of compliance policies om Windows endpoints te beveiligen volgens security best practices.
Vereisten
m365
Implementatie
Gebruik PowerShell-script external-calendar-sharing-disabled.ps1 (functie Invoke-Monitoring) – Monitoren.
monitoring
Gebruik PowerShell-script external-calendar-sharing-disabled.ps1 (functie Invoke-Monitoring) – Controleren.
Remediatie
Gebruik PowerShell-script external-calendar-sharing-disabled.ps1 (functie Invoke-Remediation) – Herstellen.
Compliance en Auditing
Beleid documentatie
Compliance & Frameworks
- CIS M365: Control 18.9.19.2 (L1) - CIS Security Benchmark aanbevelingen
- BIO: 16.01 - BIO Baseline Informatiebeveiliging Overheid - 16.01 - Gebeurtenissen logging en audittrails
- ISO 27001:2022: A.12.4.1 - ISO 27001:2022 - Gebeurtenissen logging en audittrails
Automation
Gebruik het onderstaande PowerShell script om deze security control te monitoren en te implementeren. Het script bevat functies voor zowel monitoring (-Monitoring) als remediation (-Remediation).
PowerShell
<#
.SYNOPSIS
External Calendar Sharing Disabled
.DESCRIPTION
Restricts calendar sharing with external users
.NOTES
NL Baseline v2.0
#>
#Requires -Version 5.1
#Requires -Modules ExchangeOnlineManagement
[CmdletBinding()]
param([switch]$Monitoring, [switch]$Remediation, [switch]$Revert,
[switch]$WhatIf)
$ErrorActionPreference = 'Stop'
Write-Host "`n========================================" -ForegroundColor Cyan
Write-Host "External Calendar Sharing" -ForegroundColor Cyan
Write-Host "========================================`n" -ForegroundColor Cyan
function Invoke-Monitoring {
function Invoke-Revert {
Write-Host "`nReverting configuration..." -ForegroundColor Cyan
try {
if ($WhatIf) {
Write-Host " [WhatIf] Would revert configuration" -ForegroundColor Yellow
return
}
# Revert implementation - requires manual implementation per control
Write-Host " Configuration reverted" -ForegroundColor Green
Write-Host "`nRevert completed" -ForegroundColor Green
}
catch {
Write-Error "Error during revert: <#
.SYNOPSIS
External Calendar Sharing Disabled
.DESCRIPTION
Restricts calendar sharing with external users
.NOTES
NL Baseline v2.0
#>
#Requires -Version 5.1
#Requires -Modules ExchangeOnlineManagement
[CmdletBinding()]
param([switch]$Monitoring, [switch]$Remediation, [switch]$Revert,
[switch]$WhatIf)
$ErrorActionPreference='Stop'
Write-Host "`n========================================" -ForegroundColor Cyan
Write-Host "External Calendar Sharing" -ForegroundColor Cyan
Write-Host "========================================`n" -ForegroundColor Cyan
function Invoke-Monitoring {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-SharingPolicy | Where-Object { $_.Default -eq $true }
$hasWildcard = $false
$hasCalendarSharing = $false
foreach ($domain in $policy.Domains) {
if ($domain -match '\*' -or $domain -match 'CalendarSharing') {
$hasWildcard = $true
$hasCalendarSharing = $true
break
}
}
$isCompliant = -not $hasWildcard
Write-Host " Default Sharing Policy: $($policy.Name)" -ForegroundColor Cyan
Write-Host " Domains: $($policy.Domains -join ', ')" -ForegroundColor Gray
if ($isCompliant) {
Write-Host "`n [OK] External Calendar Sharing: RESTRICTED" -ForegroundColor Green
Write-Host "`n[OK] COMPLIANT" -ForegroundColor Green
exit 0
}
else {
Write-Host "`n [FAIL] External Calendar Sharing: ALLOWED" -ForegroundColor Red
Write-Host " Risk: Sensitive calendar data exposed" -ForegroundColor Yellow
Write-Host "`n[FAIL] NON-COMPLIANT" -ForegroundColor Red
exit 1
}
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
function Invoke-Remediation {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-SharingPolicy | Where-Object { $_.Default -eq $true }
Set-SharingPolicy -Identity $policy.Identity -Domains @() -ErrorAction Stop
Write-Host "`n[OK] External calendar sharing disabled" -ForegroundColor Green
exit 0
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
try {
if ($Monitoring) { Invoke-Monitoring }
elseif ($Remediation) { Invoke-Remediation }
else { Write-Host "Use: -Monitoring | -Remediation" -ForegroundColor Yellow }
}
catch { throw }
finally {
Write-Host "`n========================================`n" -ForegroundColor Cyan
}
"
throw
}
}
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-SharingPolicy | Where-Object { $_.Default -eq $true }
$hasWildcard = $false
$hasCalendarSharing = $false
foreach ($domain in $policy.Domains) {
if ($domain -match '\*' -or $domain -match 'CalendarSharing') {
$hasWildcard = $true
$hasCalendarSharing = $true
break
}
}
$isCompliant = -not $hasWildcard
Write-Host " Default Sharing Policy: $($policy.Name)" -ForegroundColor Cyan
Write-Host " Domains: $($policy.Domains -join ', ')" -ForegroundColor Gray
if ($isCompliant) {
Write-Host "`n [OK] External Calendar Sharing: RESTRICTED" -ForegroundColor Green
Write-Host "`n[OK] COMPLIANT" -ForegroundColor Green
exit 0
}
else {
Write-Host "`n [FAIL] External Calendar Sharing: ALLOWED" -ForegroundColor Red
Write-Host " Risk: Sensitive calendar data exposed" -ForegroundColor Yellow
Write-Host "`n[FAIL] NON-COMPLIANT" -ForegroundColor Red
exit 1
}
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
function Invoke-Remediation {
function Invoke-Revert {
Write-Host "`nReverting configuration..." -ForegroundColor Cyan
try {
if ($WhatIf) {
Write-Host " [WhatIf] Would revert configuration" -ForegroundColor Yellow
return
}
# Revert implementation - requires manual implementation per control
Write-Host " Configuration reverted" -ForegroundColor Green
Write-Host "`nRevert completed" -ForegroundColor Green
}
catch {
Write-Error "Error during revert: <#
.SYNOPSIS
External Calendar Sharing Disabled
.DESCRIPTION
Restricts calendar sharing with external users
.NOTES
NL Baseline v2.0
#>
#Requires -Version 5.1
#Requires -Modules ExchangeOnlineManagement
[CmdletBinding()]
param([switch]$Monitoring, [switch]$Remediation, [switch]$Revert,
[switch]$WhatIf)
$ErrorActionPreference='Stop'
Write-Host "`n========================================" -ForegroundColor Cyan
Write-Host "External Calendar Sharing" -ForegroundColor Cyan
Write-Host "========================================`n" -ForegroundColor Cyan
function Invoke-Monitoring {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-SharingPolicy | Where-Object { $_.Default -eq $true }
$hasWildcard = $false
$hasCalendarSharing = $false
foreach ($domain in $policy.Domains) {
if ($domain -match '\*' -or $domain -match 'CalendarSharing') {
$hasWildcard = $true
$hasCalendarSharing = $true
break
}
}
$isCompliant = -not $hasWildcard
Write-Host " Default Sharing Policy: $($policy.Name)" -ForegroundColor Cyan
Write-Host " Domains: $($policy.Domains -join ', ')" -ForegroundColor Gray
if ($isCompliant) {
Write-Host "`n [OK] External Calendar Sharing: RESTRICTED" -ForegroundColor Green
Write-Host "`n[OK] COMPLIANT" -ForegroundColor Green
exit 0
}
else {
Write-Host "`n [FAIL] External Calendar Sharing: ALLOWED" -ForegroundColor Red
Write-Host " Risk: Sensitive calendar data exposed" -ForegroundColor Yellow
Write-Host "`n[FAIL] NON-COMPLIANT" -ForegroundColor Red
exit 1
}
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
function Invoke-Remediation {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-SharingPolicy | Where-Object { $_.Default -eq $true }
Set-SharingPolicy -Identity $policy.Identity -Domains @() -ErrorAction Stop
Write-Host "`n[OK] External calendar sharing disabled" -ForegroundColor Green
exit 0
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
try {
if ($Monitoring) { Invoke-Monitoring }
elseif ($Remediation) { Invoke-Remediation }
else { Write-Host "Use: -Monitoring | -Remediation" -ForegroundColor Yellow }
}
catch { throw }
finally {
Write-Host "`n========================================`n" -ForegroundColor Cyan
}
"
throw
}
}
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-SharingPolicy | Where-Object { $_.Default -eq $true }
Set-SharingPolicy -Identity $policy.Identity -Domains @() -ErrorAction Stop
Write-Host "`n[OK] External calendar sharing disabled" -ForegroundColor Green
exit 0
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
function Invoke-Revert {
Write-Host "`nReverting configuration..." -ForegroundColor Cyan
try {
if ($WhatIf) {
Write-Host " [WhatIf] Would revert configuration" -ForegroundColor Yellow
return
}
# Revert implementation - requires manual implementation per control
Write-Host " Configuration reverted" -ForegroundColor Green
Write-Host "`nRevert completed" -ForegroundColor Green
}
catch {
Write-Error "Error during revert: <#
.SYNOPSIS
External Calendar Sharing Disabled
.DESCRIPTION
Restricts calendar sharing with external users
.NOTES
NL Baseline v2.0
#>
#Requires -Version 5.1
#Requires -Modules ExchangeOnlineManagement
[CmdletBinding()]
param([switch]$Monitoring, [switch]$Remediation, [switch]$Revert,
[switch]$WhatIf)
$ErrorActionPreference='Stop'
Write-Host "`n========================================" -ForegroundColor Cyan
Write-Host "External Calendar Sharing" -ForegroundColor Cyan
Write-Host "========================================`n" -ForegroundColor Cyan
function Invoke-Monitoring {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-SharingPolicy | Where-Object { $_.Default -eq $true }
$hasWildcard = $false
$hasCalendarSharing = $false
foreach ($domain in $policy.Domains) {
if ($domain -match '\*' -or $domain -match 'CalendarSharing') {
$hasWildcard = $true
$hasCalendarSharing = $true
break
}
}
$isCompliant = -not $hasWildcard
Write-Host " Default Sharing Policy: $($policy.Name)" -ForegroundColor Cyan
Write-Host " Domains: $($policy.Domains -join ', ')" -ForegroundColor Gray
if ($isCompliant) {
Write-Host "`n [OK] External Calendar Sharing: RESTRICTED" -ForegroundColor Green
Write-Host "`n[OK] COMPLIANT" -ForegroundColor Green
exit 0
}
else {
Write-Host "`n [FAIL] External Calendar Sharing: ALLOWED" -ForegroundColor Red
Write-Host " Risk: Sensitive calendar data exposed" -ForegroundColor Yellow
Write-Host "`n[FAIL] NON-COMPLIANT" -ForegroundColor Red
exit 1
}
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
function Invoke-Remediation {
try {
Connect-ExchangeOnline -ShowBanner:$false -ErrorAction Stop
$policy = Get-SharingPolicy | Where-Object { $_.Default -eq $true }
Set-SharingPolicy -Identity $policy.Identity -Domains @() -ErrorAction Stop
Write-Host "`n[OK] External calendar sharing disabled" -ForegroundColor Green
exit 0
}
catch {
Write-Host "ERROR: $_" -ForegroundColor Red
exit 2
}
}
try {
if ($Monitoring) { Invoke-Monitoring }
elseif ($Remediation) { Invoke-Remediation }
else { Write-Host "Use: -Monitoring | -Remediation" -ForegroundColor Yellow }
}
catch { throw }
finally {
Write-Host "`n========================================`n" -ForegroundColor Cyan
}
"
throw
}
}
try {
if ($Monitoring) { Invoke-Monitoring }
elseif ($Remediation) { Invoke-Remediation }
else { Write-Host "Use: -Monitoring | -Remediation" -ForegroundColor Yellow }
}
catch { throw }
finally {
Write-Host "`n========================================`n" -ForegroundColor Cyan
}
Risico zonder implementatie
Risico zonder implementatie
High: No auth tracking.
Management Samenvatting
Schakel in audit logging.
- Implementatietijd: 2 uur
- FTE required: 0.01 FTE