|
| 1 | +<# |
| 2 | +.SYNOPSIS |
| 3 | + Sensitive data exfiltration through file transfers is prevented by network content filtering policies. |
| 4 | +.DESCRIPTION |
| 5 | + Verifies that file policies are configured in Global Secure Access and enforced through filtering profiles. |
| 6 | + The test passes if file policies exist and are enforced either through the Baseline Profile or through |
| 7 | + Security Profiles assigned to Conditional Access policies. |
| 8 | +#> |
| 9 | + |
| 10 | +function Test-Assessment-25413 { |
| 11 | + [ZtTest( |
| 12 | + Category = 'Global Secure Access', |
| 13 | + ImplementationCost = 'High', |
| 14 | + MinimumLicense = ('Entra_Premium_Internet_Access'), |
| 15 | + Pillar = 'Network', |
| 16 | + RiskLevel = 'High', |
| 17 | + SfiPillar = 'Protect networks', |
| 18 | + TenantType = ('Workforce'), |
| 19 | + TestId = 25413, |
| 20 | + Title = 'Sensitive data exfiltration through file transfers is prevented by network content filtering policies', |
| 21 | + UserImpact = 'Medium' |
| 22 | + )] |
| 23 | + [CmdletBinding()] |
| 24 | + param() |
| 25 | + |
| 26 | + # Define constants |
| 27 | + [int]$BASELINE_PROFILE_PRIORITY = 65000 |
| 28 | + |
| 29 | + #region Data Collection |
| 30 | + Write-PSFMessage '🟦 Start' -Tag Test -Level VeryVerbose |
| 31 | + |
| 32 | + $activity = 'Checking file policy configuration for data exfiltration prevention' |
| 33 | + Write-ZtProgress -Activity $activity -Status 'Querying file policies' |
| 34 | + |
| 35 | + # Step 1: Get file policies (undocumented endpoint - handle errors gracefully) |
| 36 | + $filePolicies = $null |
| 37 | + $errorMsg = $null |
| 38 | + try { |
| 39 | + $filePolicies = Invoke-ZtGraphRequest -RelativeUri 'networkAccess/filePolicies' -ApiVersion beta |
| 40 | + } |
| 41 | + catch { |
| 42 | + $errorMsg = $_.Exception.Message |
| 43 | + Write-PSFMessage $_.Exception.Message -Tag Test -Level Error |
| 44 | + } |
| 45 | + |
| 46 | + # Step 2: Get filtering profiles with linked policies |
| 47 | + Write-ZtProgress -Activity $activity -Status 'Querying filtering profiles and linked policies' |
| 48 | + $filteringProfiles = $null |
| 49 | + try { |
| 50 | + $filteringProfiles = Invoke-ZtGraphRequest -RelativeUri 'networkAccess/filteringProfiles' -QueryParameters @{ |
| 51 | + '$select' = 'id,name,description,state,version,priority' |
| 52 | + '$expand' = 'policies($select=id,state;$expand=policy($select=id,name,version))' |
| 53 | + } -ApiVersion beta |
| 54 | + } |
| 55 | + catch { |
| 56 | + if ($null -eq $errorMsg) { |
| 57 | + $errorMsg = $_.Exception.Message |
| 58 | + } |
| 59 | + Write-PSFMessage $_.Exception.Message -Tag Test -Level Error |
| 60 | + } |
| 61 | + |
| 62 | + # Step 3: Get all Conditional Access policies |
| 63 | + Write-ZtProgress -Activity $activity -Status 'Querying Conditional Access policies' |
| 64 | + $allCAPolicies = Get-ZtConditionalAccessPolicy |
| 65 | + |
| 66 | + # Collect all linked profiles |
| 67 | + $allLinkedProfiles = @() |
| 68 | + foreach ($filePolicy in $filePolicies) { |
| 69 | + $linkedProfiles = Find-ZtProfilesLinkedToPolicy -PolicyId $filePolicy.id -FilteringProfiles $filteringProfiles -CAPolicies $allCAPolicies -BaselinePriority $BASELINE_PROFILE_PRIORITY -PolicyLinkType 'filePolicyLink' -PolicyRules $filePolicy |
| 70 | + |
| 71 | + foreach ($profileLink in $linkedProfiles) { |
| 72 | + $allLinkedProfiles += [PSCustomObject]@{ |
| 73 | + ProfileId = $profileLink.ProfileId |
| 74 | + ProfileName = $profileLink.ProfileName |
| 75 | + ProfileType = $profileLink.ProfileType |
| 76 | + ProfileState = $profileLink.ProfileState |
| 77 | + ProfilePriority = $profileLink.ProfilePriority |
| 78 | + PolicyLinkState = $profileLink.PolicyLinkState |
| 79 | + PassesCriteria = $profileLink.PassesCriteria |
| 80 | + CAPolicy = $profileLink.CAPolicy |
| 81 | + } |
| 82 | + } |
| 83 | + } |
| 84 | + |
| 85 | + #endregion Data Collection |
| 86 | + |
| 87 | + #region Assessment Logic |
| 88 | + # Handle API errors early |
| 89 | + if ($errorMsg) { |
| 90 | + $passed = $false |
| 91 | + $testResultMarkdown = "❌ Unable to query Global Secure Access API endpoints. This may indicate the feature is not available in your tenant or the API has changed. Error: $errorMsg" |
| 92 | + } |
| 93 | + # Pass if any profile passes criteria (enabled baseline OR enabled security profile with CA) |
| 94 | + elseif (($allLinkedProfiles | Where-Object { $_.PassesCriteria -and $_.ProfileState -eq 'enabled' -and $_.PolicyLinkState -eq 'enabled' }).Count -gt 0) { |
| 95 | + $passed = $true |
| 96 | + $testResultMarkdown = @" |
| 97 | +✅ File policies are configured and actively enforced through a filtering profile, protecting against data exfiltration through unmonitored file transfers. |
| 98 | +
|
| 99 | +%TestResult% |
| 100 | +"@ |
| 101 | + } |
| 102 | + elseif ($null -eq $filePolicies -or $filePolicies.Count -eq 0) { |
| 103 | + $passed = $false |
| 104 | + $testResultMarkdown = "❌ No file policy is configured. File transfers are unmonitored and the organization is exposed to data exfiltration risk.`n`n%TestResult%" |
| 105 | + } |
| 106 | + else { |
| 107 | + $passed = $false |
| 108 | + $testResultMarkdown = "❌ File policies are either not configured or not linked to an active filtering profile, leaving file transfers unmonitored and exposing the organization to data exfiltration risk.`n`n%TestResult%" |
| 109 | + } |
| 110 | + |
| 111 | + #endregion Assessment Logic |
| 112 | + |
| 113 | + #region Report Generation |
| 114 | + $mdInfo = '' |
| 115 | + |
| 116 | + # Table 1: File Policy Configuration |
| 117 | + if ($filePolicies -and $filePolicies.Count -gt 0) { |
| 118 | + $table1Title = 'File Policy Configuration' |
| 119 | + $table1Link = 'https://entra.microsoft.com/#view/Microsoft_Azure_Network_Access/SecurityFiltering.ReactView' |
| 120 | + |
| 121 | + $table1Template = @' |
| 122 | +
|
| 123 | +## [{0}]({1}) |
| 124 | +
|
| 125 | +| File Policy Name | Default Action | |
| 126 | +| :--------------- | :------------- | |
| 127 | +{2} |
| 128 | +'@ |
| 129 | + |
| 130 | + $table1Rows = '' |
| 131 | + foreach ($fp in $filePolicies) { |
| 132 | + $fpName = Get-SafeMarkdown -Text $fp.name |
| 133 | + $defaultAction = if ($fp.settings.defaultAction) { $fp.settings.defaultAction } else { 'N/A' } |
| 134 | + $fpLink = "https://entra.microsoft.com/#view/Microsoft_Azure_Network_Access/EditFilePolicyMenuBlade.MenuView/~/basics/policyId/$($fp.id)" |
| 135 | + $table1Rows += "| [$fpName]($fpLink) | $defaultAction |`n" |
| 136 | + } |
| 137 | + |
| 138 | + $mdInfo += $table1Template -f $table1Title, $table1Link, $table1Rows |
| 139 | + } |
| 140 | + |
| 141 | + # Table 2: Filtering Profile Linkage (unified - baseline and security profiles) |
| 142 | + if ($allLinkedProfiles.Count -gt 0) { |
| 143 | + $table2Title = 'Filtering Profile Linkage' |
| 144 | + $table2Link = 'https://entra.microsoft.com/#view/Microsoft_Azure_Network_Access/SecurityProfiles.ReactView' |
| 145 | + |
| 146 | + $table2Template = @' |
| 147 | +
|
| 148 | +## [{0}]({1}) |
| 149 | +
|
| 150 | +| Linked Profile Name | Profile State | Policy Link State | |
| 151 | +| :------------------ | :------------ | :---------------- | |
| 152 | +{2} |
| 153 | +'@ |
| 154 | + |
| 155 | + $table2Rows = '' |
| 156 | + foreach ($profile in ($allLinkedProfiles | Sort-Object -Property ProfilePriority)) { |
| 157 | + $profileLink = "https://entra.microsoft.com/#view/Microsoft_Azure_Network_Access/EditProfileMenuBlade.MenuView/~/basics/profileId/$($profile.ProfileId)" |
| 158 | + $profileName = Get-SafeMarkdown -Text $profile.ProfileName |
| 159 | + $table2Rows += "| [$profileName]($profileLink) | $($profile.ProfileState) | $($profile.PolicyLinkState) |`n" |
| 160 | + } |
| 161 | + |
| 162 | + $mdInfo += $table2Template -f $table2Title, $table2Link, $table2Rows |
| 163 | + } |
| 164 | + |
| 165 | + # Table 3: Conditional Access Enforcement |
| 166 | + $caPoliciesForReport = @($allLinkedProfiles.CAPolicy | Where-Object { $null -ne $_ } | Sort-Object -Property Id -Unique) |
| 167 | + |
| 168 | + if ($caPoliciesForReport.Count -gt 0) { |
| 169 | + $table3Title = 'Conditional Access Enforcement' |
| 170 | + $table3Link = 'https://entra.microsoft.com/#view/Microsoft_AAD_ConditionalAccess/ConditionalAccessBlade/~/Policies' |
| 171 | + |
| 172 | + $table3Template = @' |
| 173 | +
|
| 174 | +## [{0}]({1}) |
| 175 | +
|
| 176 | +| CA Policy Name | CA Policy State | |
| 177 | +| :------------- | :-------------- | |
| 178 | +{2} |
| 179 | +'@ |
| 180 | + |
| 181 | + $table3Rows = '' |
| 182 | + foreach ($ca in ($caPoliciesForReport | Sort-Object -Property DisplayName)) { |
| 183 | + $caLink = "https://entra.microsoft.com/#view/Microsoft_AAD_ConditionalAccess/PolicyBlade/policyId/$($ca.Id)" |
| 184 | + $caName = Get-SafeMarkdown -Text $ca.DisplayName |
| 185 | + $table3Rows += "| [$caName]($caLink) | $($ca.State) |`n" |
| 186 | + } |
| 187 | + |
| 188 | + $mdInfo += $table3Template -f $table3Title, $table3Link, $table3Rows |
| 189 | + } |
| 190 | + |
| 191 | + $testResultMarkdown = $testResultMarkdown -replace '%TestResult%', $mdInfo |
| 192 | + |
| 193 | + #endregion Report Generation |
| 194 | + |
| 195 | + $params = @{ |
| 196 | + TestId = '25413' |
| 197 | + Status = $passed |
| 198 | + Result = $testResultMarkdown |
| 199 | + } |
| 200 | + |
| 201 | + Add-ZtTestResultDetail @params |
| 202 | +} |
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