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| 1 | +function Invoke-CippTestZTNA21892 { |
| 2 | + <# |
| 3 | + .SYNOPSIS |
| 4 | + Verifies that all sign-in activity is restricted to managed devices |
| 5 | +
|
| 6 | + .DESCRIPTION |
| 7 | + Checks for Conditional Access policies that: |
| 8 | + - Apply to all users |
| 9 | + - Apply to all applications |
| 10 | + - Require compliant or hybrid joined devices |
| 11 | + - Are enabled |
| 12 | +
|
| 13 | + .FUNCTIONALITY |
| 14 | + Internal |
| 15 | + #> |
| 16 | + [CmdletBinding()] |
| 17 | + param( |
| 18 | + [Parameter(Mandatory = $true)] |
| 19 | + [string]$Tenant |
| 20 | + ) |
| 21 | + |
| 22 | + try { |
| 23 | + # Get Conditional Access policies from cache |
| 24 | + $Policies = New-CIPPDbRequest -TenantFilter $Tenant -Type 'ConditionalAccessPolicies' |
| 25 | + |
| 26 | + if (-not $Policies) { |
| 27 | + Add-CippTestResult -TestId 'ZTNA21892' -TenantFilter $Tenant -TestType 'ZeroTrustNetworkAccess' -Status 'Skipped' ` |
| 28 | + -ResultMarkdown 'No Conditional Access policies found in cache.' ` |
| 29 | + -Risk 'High' -Name 'All sign-in activity comes from managed devices' ` |
| 30 | + -UserImpact 'High' -ImplementationEffort 'High' ` |
| 31 | + -Category 'Access control' |
| 32 | + return |
| 33 | + } |
| 34 | + |
| 35 | + # Find policies that require managed devices for all users and apps |
| 36 | + $MatchingPolicies = [System.Collections.Generic.List[object]]::new() |
| 37 | + foreach ($Policy in $Policies) { |
| 38 | + # Check if applies to all users |
| 39 | + $appliesToAllUsers = $false |
| 40 | + if ($Policy.conditions.users.includeUsers) { |
| 41 | + foreach ($user in $Policy.conditions.users.includeUsers) { |
| 42 | + if ($user -eq 'All') { |
| 43 | + $appliesToAllUsers = $true |
| 44 | + break |
| 45 | + } |
| 46 | + } |
| 47 | + } |
| 48 | + |
| 49 | + # Check if applies to all apps |
| 50 | + $appliesToAllApps = $false |
| 51 | + if ($Policy.conditions.applications.includeApplications) { |
| 52 | + foreach ($app in $Policy.conditions.applications.includeApplications) { |
| 53 | + if ($app -eq 'All') { |
| 54 | + $appliesToAllApps = $true |
| 55 | + break |
| 56 | + } |
| 57 | + } |
| 58 | + } |
| 59 | + |
| 60 | + # Check if requires compliant or hybrid joined device |
| 61 | + $requiresCompliantDevice = $false |
| 62 | + $requiresHybridJoined = $false |
| 63 | + if ($Policy.grantControls.builtInControls) { |
| 64 | + foreach ($control in $Policy.grantControls.builtInControls) { |
| 65 | + if ($control -eq 'compliantDevice') { |
| 66 | + $requiresCompliantDevice = $true |
| 67 | + } |
| 68 | + if ($control -eq 'domainJoinedDevice') { |
| 69 | + $requiresHybridJoined = $true |
| 70 | + } |
| 71 | + } |
| 72 | + } |
| 73 | + |
| 74 | + $isEnabled = $Policy.state -eq 'enabled' |
| 75 | + |
| 76 | + # Policy matches if enabled, applies to all users/apps, and requires managed device |
| 77 | + if ($isEnabled -and $appliesToAllUsers -and $appliesToAllApps -and ($requiresCompliantDevice -or $requiresHybridJoined)) { |
| 78 | + $MatchingPolicies.Add([PSCustomObject]@{ |
| 79 | + PolicyId = $Policy.id |
| 80 | + PolicyState = $Policy.state |
| 81 | + DisplayName = $Policy.displayName |
| 82 | + AllUsers = $appliesToAllUsers |
| 83 | + AllApps = $appliesToAllApps |
| 84 | + CompliantDevice = $requiresCompliantDevice |
| 85 | + HybridJoinedDevice = $requiresHybridJoined |
| 86 | + IsFullyCompliant = $isEnabled -and $appliesToAllUsers -and $appliesToAllApps -and ($requiresCompliantDevice -or $requiresHybridJoined) |
| 87 | + }) |
| 88 | + } |
| 89 | + } |
| 90 | + |
| 91 | + # Determine pass/fail |
| 92 | + if ($MatchingPolicies.Count -gt 0) { |
| 93 | + $Status = 'Passed' |
| 94 | + $ResultMarkdown = "✅ **Pass**: Conditional Access policies require managed devices for all sign-in activity.`n`n" |
| 95 | + $ResultMarkdown += "## Matching policies`n`n" |
| 96 | + $ResultMarkdown += "| Policy name | State | All users | All apps | Compliant device | Hybrid joined |`n" |
| 97 | + $ResultMarkdown += "| :---------- | :---- | :-------- | :------- | :--------------- | :------------ |`n" |
| 98 | + |
| 99 | + foreach ($Policy in $MatchingPolicies) { |
| 100 | + $policyLink = "https://entra.microsoft.com/#view/Microsoft_AAD_ConditionalAccess/PolicyBlade/policyId/$($Policy.PolicyId)" |
| 101 | + $policyName = if ($Policy.DisplayName) { $Policy.DisplayName } else { 'Unnamed' } |
| 102 | + $allUsers = if ($Policy.AllUsers) { '✅' } else { '❌' } |
| 103 | + $allApps = if ($Policy.AllApps) { '✅' } else { '❌' } |
| 104 | + $compliant = if ($Policy.CompliantDevice) { '✅' } else { '❌' } |
| 105 | + $hybrid = if ($Policy.HybridJoinedDevice) { '✅' } else { '❌' } |
| 106 | + |
| 107 | + $ResultMarkdown += "| [$policyName]($policyLink) | $($Policy.PolicyState) | $allUsers | $allApps | $compliant | $hybrid |`n" |
| 108 | + } |
| 109 | + } else { |
| 110 | + $Status = 'Failed' |
| 111 | + $ResultMarkdown = "❌ **Fail**: No Conditional Access policies found that require managed devices for all sign-in activity.`n`n" |
| 112 | + $ResultMarkdown += 'Organizations should enforce that all sign-ins come from managed devices (compliant or hybrid Azure AD joined) to ensure security controls are applied.' |
| 113 | + } |
| 114 | + |
| 115 | + Add-CippTestResult -TestId 'ZTNA21892' -TenantFilter $Tenant -TestType 'ZeroTrustNetworkAccess' -Status $Status ` |
| 116 | + -ResultMarkdown $ResultMarkdown ` |
| 117 | + -Risk 'High' -Name 'All sign-in activity comes from managed devices' ` |
| 118 | + -UserImpact 'High' -ImplementationEffort 'High' ` |
| 119 | + -Category 'Access control' |
| 120 | + |
| 121 | + } catch { |
| 122 | + Add-CippTestResult -TestId 'ZTNA21892' -TenantFilter $Tenant -TestType 'ZeroTrustNetworkAccess' -Status 'Failed' ` |
| 123 | + -ResultMarkdown "❌ **Error**: $($_.Exception.Message)" ` |
| 124 | + -Risk 'High' -Name 'All sign-in activity comes from managed devices' ` |
| 125 | + -UserImpact 'High' -ImplementationEffort 'High' ` |
| 126 | + -Category 'Access control' |
| 127 | + Write-LogMessage -API 'ZeroTrustNetworkAccess' -tenant $Tenant -message "Test ZTNA21892 failed: $($_.Exception.Message)" -sev Error |
| 128 | + } |
| 129 | +} |
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