mirror of
https://github.com/Yamato-Security/WELA.git
synced 2026-09-29 02:24:53 +02:00
192 lines
22 KiB
PowerShell
192 lines
22 KiB
PowerShell
$ErrorActionPreference = 'Stop'
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Import-Module (Join-Path $PSScriptRoot '../modules/RuleEligibility.psm1') -Force
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$checks = 0
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function Assert($Value, $Message) { if (-not $Value) { throw $Message }; $script:checks++ }
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function Assert-Throws($Action, $Message) { $caught=$false; try { & $Action | Out-Null } catch { $caught=$true }; Assert $caught $Message }
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$root = Join-Path ([IO.Path]::GetTempPath()) ('wela-eligibility-' + [guid]::NewGuid().ToString('N'))
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$null = New-Item -ItemType Directory -Path $root
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$corpusPath = Join-Path $root 'rules.json'; $manifestPath = Join-Path $root 'manifest.json'; $bundlePath = Join-Path $root 'evidence.json'
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$mappingPath = Join-Path $PSScriptRoot '../config/eid_subcategory_mapping.csv'
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$now = [DateTime]::Parse('2026-09-19T12:00:00Z').ToUniversalTime()
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function Save-Json($Object, $Path) { ConvertTo-Json -InputObject $Object -Depth 20 | Set-Content -LiteralPath $Path -Encoding UTF8 }
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function Hash($Path) { (Get-FileHash -LiteralPath $Path -Algorithm SHA256).Hash.ToLowerInvariant() }
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function Save-Corpus($Rules) {
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Save-Json @($Rules) $corpusPath
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Save-Json @{schemaVersion=1;corpusSha256=(Hash $corpusPath);mappingSha256=(Hash $mappingPath)} $manifestPath
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}
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function Fixture-Rule($Id='process') {
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[pscustomobject]@{id=$Id;title='Benign process fixture';category='process_creation';service='';channel=@('sec');event_ids=@('4688');subcategory_guids=@('0CCE922B-69AE-11D9-BED3-505054503030');level='low';description='Synthetic evidence; not a live Windows test.';tags=@()}
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}
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function Report([switch]$Evidence) {
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$args = @{CorpusPath=$corpusPath;ManifestPath=$manifestPath;MappingPath=$mappingPath;Now=$now}
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if ($Evidence) { $args.EvidencePath=$bundlePath }
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Get-WelaRuleEligibility @args
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}
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function Save-Artifact($Name, $Object, [switch]$Text) {
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$path = Join-Path $root ($Name + '.txt')
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if ($Text) { [IO.File]::WriteAllText($path, [string]$Object, [Text.UTF8Encoding]::new($false)) }
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else { Save-Json $Object $path }
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$script:record.artifacts.$Name = @{path=($Name+'.txt');sha256=(Hash $path)}
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}
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function Save-Bundle { Save-Json @{schemaVersion=1;kind='WelaNativeRuleEvidence';records=@($script:record)} $bundlePath }
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function Reset-Evidence {
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Save-Corpus @(Fixture-Rule)
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$base = Report
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$script:record = @{id='process';metadataSha256=$base.Results[0].MetadataSha256;corpusSha256=(Hash $corpusPath);mappingSha256=(Hash $mappingPath);adapter='security-single-event-exact-v1';fieldMappings=@{EventID='System.EventID';Image='EventData.NewProcessName';CommandLine='EventData.CommandLine'};artifacts=@{}}
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$script:definition = @{id='process';logsource=@{product='windows';category='process_creation'};detection=@{selection=@{EventID=4688;Image='C:\Windows\System32\notepad.exe';CommandLine='notepad.exe --wela-fixture'};condition='selection'}}
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Save-Artifact sourceRule "id: process`nlogsource: {product: windows, category: process_creation}`ndetection:`n selection:`n EventID: 4688`n Image: C:\Windows\System32\notepad.exe`n CommandLine: notepad.exe --wela-fixture`n condition: selection`n" -Text
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Save-Artifact normalizedRule $script:definition
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$context=@{computer='lab.example.test';role='Client';build=26100;patch='fixture-1';domainJoined=$false;installedRoles=@();backend='fixture-backend';backendVersion='1'}
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$script:before=@{context=$context;capturedAtUtc='2026-09-19T10:00:00Z';auditPolicies=@{'0CCE922B-69AE-11D9-BED3-505054503030'=0}}
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$script:after=@{context=$context;capturedAtUtc='2026-09-19T10:02:00Z';auditPolicies=@{'0CCE922B-69AE-11D9-BED3-505054503030'=1};auditPrecedence=@{kind='DWord';value=1};securityChannelEnabled=$true;commandLineCapture=@{kind='DWord';value=1}}
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Save-Artifact beforeState $script:before; Save-Artifact afterState $script:after
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$script:eventXml='<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Microsoft-Windows-Security-Auditing"/><EventID>4688</EventID><Version>2</Version><Keywords>0x8020000000000000</Keywords><TimeCreated SystemTime="2026-09-19T10:01:00Z"/><EventRecordID>42</EventRecordID><Channel>Security</Channel><Computer>lab.example.test</Computer></System><EventData><Data Name="NewProcessName">C:\Windows\System32\notepad.exe</Data><Data Name="CommandLine">notepad.exe --wela-fixture</Data></EventData></Event>'
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Save-Artifact eventXml $script:eventXml -Text
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$script:ingestion=@{computer='lab.example.test';channel='Security';eventId=4688;recordId=42;eventSha256=$script:record.artifacts.eventXml.sha256;backend='fixture-backend';backendVersion='1';receivedAtUtc='2026-09-19T10:03:00Z';normalizedFields=@{EventID='4688';Image='C:\Windows\System32\notepad.exe';CommandLine='notepad.exe --wela-fixture'}}
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Save-Artifact ingestion $script:ingestion
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Save-Artifact query 'Fixture backend query artifact; this test never executes a query.' -Text
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$script:queryResult=@{backend='fixture-backend';backendVersion='1';executedAtUtc='2026-09-19T10:04:00Z';eventSha256=$script:record.artifacts.eventXml.sha256;ruleSha256=$script:record.artifacts.normalizedRule.sha256;querySha256=$script:record.artifacts.query.sha256;matched=$true;exitCode=0}
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Save-Artifact queryResult $script:queryResult
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$script:review=@{ruleId='process';reviewer='Fixture author (synthetic evidence only)';reviewedAtUtc='2026-09-19T10:05:00Z';statement='Complete rule normalization reviewed; no detection logic omitted.';sourceRuleSha256=$script:record.artifacts.sourceRule.sha256;normalizedRuleSha256=$script:record.artifacts.normalizedRule.sha256}
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Save-Artifact review $script:review
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Save-Bundle
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}
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function Assert-NotReady($Message) { Save-Bundle; $r=Report -Evidence; Assert ($r.Summary.Ready -eq 0 -and $r.Results[0].Reasons.Count -gt 0) $Message }
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try {
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# Construct Unicode explicitly so the test source also loads correctly in
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# Windows PowerShell 5.1 without relying on a UTF-8 BOM.
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$hashVector=Fixture-Rule 'hash-vector'
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$hashVector.title='Apostrophe' + [char]0x27 + 's <node> & "quoted" \ path ' + [char]0x65e5 + [char]0x672c + [char]0x8a9e + [char]::ConvertFromUtf32(0x1f600)
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$hashVector.description="line`nnext`ttab"
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$actualMetadataHash=& (Get-Module RuleEligibility) { param($rule) Get-WelaEligibilityRuleHash $rule } $hashVector
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# Expected digest independently calculated from the documented framing in Python.
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Assert ($actualMetadataHash -eq 'cfa5e1a0f73d8f0eef62716a44e56334461bbf55ddf0a07b39ee63e378597e9d') ("Metadata hash is independent of PowerShell JSON serialization: " + $actualMetadataHash)
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function Canonical($Value) { & (Get-Module RuleEligibility) { param($item) ConvertTo-WelaEligibilityCanonicalValue -Value $item } $Value }
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foreach ($pair in @(
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[pscustomobject]@{Left=$null;Right=''}, [pscustomobject]@{Left=$null;Right=@()},
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[pscustomobject]@{Left=@();Right=[pscustomobject]@{}}, [pscustomobject]@{Left=1;Right='1'},
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[pscustomobject]@{Left=$true;Right=1}, [pscustomobject]@{Left=1;Right=1.0},
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[pscustomobject]@{Left=@('ab','c');Right=@('a','bc')}, [pscustomobject]@{Left='a';Right=@('a')},
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[pscustomobject]@{Left=@('a','b');Right=@('b','a')},
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[pscustomobject]@{Left=([string][char]0xd800);Right=([string][char]0xfffd)},
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[pscustomobject]@{Left=([string][char]0x00e9);Right=('e'+[char]0x0301)}
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)) { Assert ((Canonical $pair.Left) -cne (Canonical $pair.Right)) 'Canonical framing preserves type, boundaries, array order and exact Unicode code units.' }
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Assert ((Canonical ([pscustomobject][ordered]@{z=@('x');a=@()})) -ceq (Canonical ([pscustomobject][ordered]@{a=@();z=@('x')}))) 'Object identity uses ordinal property order rather than insertion order.'
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Assert ((Canonical ([pscustomobject]@{a=@('x')})) -cne (Canonical ([pscustomobject]@{a='x'}))) 'Nested singleton arrays retain their type.'
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Assert ((Canonical ([pscustomobject]@{a=@()})) -cne (Canonical ([pscustomobject]@{a=$null}))) 'Nested empty arrays never collapse into null.'
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Save-Corpus @(Fixture-Rule)
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$r=Report
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Assert ($r.Summary.Ready -eq 0 -and $r.Results[0].State -eq 'Conditional') 'Lossy metadata cannot demonstrate usable rules.'
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$observed=[pscustomobject]@{CurrentSetting='Success';Rules=@(Fixture-Rule)}
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$r=Get-WelaRuleEligibility -CorpusPath $corpusPath -ManifestPath $manifestPath -Observations @($observed)
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Assert ($r.Summary.Ready -eq 0 -and $r.Results[0].ConfigurationEstimate) 'Enabled Security audit policy is an estimate, never Ready.'
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$observed.CurrentSetting='No Auditing'
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$r=Get-WelaRuleEligibility -CorpusPath $corpusPath -ManifestPath $manifestPath -Observations @($observed)
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Assert ($r.Results[0].State -eq 'Blocked') 'A positively observed disabled source is distinct from missing evidence.'
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$sysmon=Fixture-Rule 'sysmon';$sysmon.channel=@('Microsoft-Windows-Sysmon/Operational')
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$external=Fixture-Rule 'exchange';$external.service='msexchange-management'
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Save-Corpus @((Fixture-Rule),(Fixture-Rule),$sysmon,$external)
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$r=Report
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Assert ($r.Summary.InputRecords -eq 4 -and $r.Summary.UniqueRules -eq 3 -and $r.Summary.DuplicateRecords -eq 1) 'Identical duplicate IDs count once with explicit raw input count.'
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Assert ($r.Summary.NativeCandidates -eq 1 -and $r.Summary.Excluded -eq 2 -and $r.Results.Count -eq 3) 'Explicit exclusions remain inspectable and all denominator choices are visible.'
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$conflict=Fixture-Rule;$conflict.title='Conflicting title';Save-Corpus @((Fixture-Rule),$conflict)
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Assert-Throws { Report } 'Conflicting duplicate metadata cannot silently change the denominator.'
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Save-Corpus @();$r=Report
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Assert ($null -eq $r.Summary.ReadyPercentNative -and $null -eq $r.Summary.ReadyPercentFullCorpus) 'An empty denominator is unknown rather than fabricated zero percent.'
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$dc=Fixture-Rule 'directory';$dc.event_ids=@('5136');$dc.subcategory_guids=@('0CCE923C-69AE-11D9-BED3-505054503030');Save-Corpus @($dc)
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$r=Get-WelaRuleEligibility -CorpusPath $corpusPath -ManifestPath $manifestPath -Role ADCS
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Assert ($r.Results[0].State -eq 'NotApplicable' -and $r.Summary.ApplicableCandidates -eq 0) 'Directory change events originate on the DC, not automatically on an AD CS member.'
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$unknown=Fixture-Rule;$unknown.event_ids=@('4703');Save-Corpus @($unknown);$r=Report
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Assert ($r.Results[0].Reasons -contains 'AuditMappingAmbiguousOrUnknown') 'Multiple canonical mappings for 4703 remain ambiguous.'
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$unknown.event_ids=@('4608');Save-Corpus @($unknown);$r=Report
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Assert ($r.Results[0].Reasons -contains 'AuditMappingAmbiguousOrUnknown') 'A category-level GUID beside a canonical mapping is not silently ignored.'
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$unknown.event_ids=@('');Save-Corpus @($unknown);$r=Report
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Assert ($r.Results[0].Reasons -contains 'UnsupportedMetadataShape') 'Blank event IDs never match category headers.'
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$unknown.event_ids='4688';Save-Corpus @($unknown);$r=Report
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Assert ($r.Results[0].Reasons -contains 'UnsupportedMetadataShape') 'Unexpected scalar metadata fails conservatively instead of being partially parsed.'
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Reset-Evidence;$r=Report -Evidence
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Assert ($r.Summary.Ready -eq 1 -and $r.Results[0].State -eq 'Ready') ('Coherent complete synthetic evidence demonstrates the importer gates: '+($r.Results[0].Reasons -join '; '))
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Assert ($r.Results[0].EvidenceContext.computer -eq 'lab.example.test' -and $r.AssessmentBasis -like '*not a current-host*') 'Imported Ready states retain their recorded host/time and explicit limitations.'
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$evidenceHtml=Join-Path $root 'evidence.html'
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Export-WelaRuleEligibility -Report $r -HtmlPath $evidenceHtml
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$exported=[IO.File]::ReadAllText($evidenceHtml)
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foreach ($required in @('Requested context','lab.example.test','Client','26100','fixture-1','domainJoined','installedRoles','fixture-backend','backendVersion','2026-09-19T10:04:00Z')) {
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Assert ($exported.Contains($required)) "Shared HTML must retain evidence scope: $required"
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}
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$hostileContext='</pre><script>alert("fixture")</script>&'
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$r.Results[0].EvidenceContext.computer=$hostileContext
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Export-WelaRuleEligibility -Report $r -HtmlPath $evidenceHtml
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$exported=[IO.File]::ReadAllText($evidenceHtml)
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Assert (-not ($exported -match '<\s*script\b')) 'Evidence context cannot create executable script markup.'
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# Windows PowerShell 5.1 may JSON-escape angle brackets before HTML encoding;
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# compare the decoded value rather than requiring one serialization spelling.
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$contextBlock=[regex]::Match($exported, '(?s)Recorded context \(not the current host\):</p><pre>(.*?)</pre>')
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Assert $contextBlock.Success 'The evidence context remains inside its HTML text block.'
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$renderedContext=[Net.WebUtility]::HtmlDecode($contextBlock.Groups[1].Value) | ConvertFrom-Json
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Assert ($renderedContext.computer -ceq $hostileContext) 'HTML text and JSON decoding preserve the exact context value without creating markup.'
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foreach ($name in @('sourceRule','normalizedRule','review','beforeState','afterState','eventXml','ingestion','query','queryResult')) {
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Reset-Evidence;$script:record.artifacts.Remove($name);Assert-NotReady "Missing $name prevents Ready."
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}
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Reset-Evidence;$script:record.metadataSha256='0'*64;Assert-NotReady 'Metadata identity mismatches cannot import readiness.'
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Reset-Evidence;$script:record.mappingSha256='0'*64;Assert-NotReady 'Changed EventID mapping invalidates old evidence.'
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Reset-Evidence;$script:record.artifacts.eventXml.sha256='0'*64;Assert-NotReady 'Changed native XML invalidates its evidence chain.'
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Reset-Evidence;$script:record.artifacts.query.path='../outside.txt';Assert-NotReady 'Artifact traversal is rejected before access.'
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Reset-Evidence;$script:record.artifacts.query.path='\\server\share\query.txt';Assert-NotReady 'UNC artifacts are rejected before access.'
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foreach ($invalidNumber in @('1', $true)) {
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Reset-Evidence;$script:after.auditPrecedence.value=$invalidNumber;Save-Artifact afterState $script:after;Assert-NotReady 'Precedence evidence requires a numeric DWORD, not a coercible string/boolean.'
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Reset-Evidence;$script:after.commandLineCapture.value=$invalidNumber;Save-Artifact afterState $script:after;Assert-NotReady 'Command-line evidence requires a numeric DWORD.'
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}
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foreach ($invalidExit in @('0', $false)) {
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Reset-Evidence;$script:queryResult.exitCode=$invalidExit;Save-Artifact queryResult $script:queryResult;Assert-NotReady 'Query exit code must be numeric, never a coercible string/boolean.'
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}
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Reset-Evidence;$script:after.auditPolicies.'0CCE922B-69AE-11D9-BED3-505054503030'=2;Save-Artifact afterState $script:after;Assert-NotReady 'Failure-only auditing cannot satisfy successful 4688 evidence.'
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Reset-Evidence;$script:after.commandLineCapture.value=0;Save-Artifact afterState $script:after;Assert-NotReady 'Observed XML cannot substitute for unverified command-line capture policy.'
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Reset-Evidence;$script:eventXml=$script:eventXml.Replace('notepad.exe --wela-fixture','');Save-Artifact eventXml $script:eventXml -Text;Assert-NotReady 'Empty 4688 command-line field prevents readiness.'
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Reset-Evidence;$script:record.fieldMappings.Image='EventData.CommandLine';Assert-NotReady 'A supplied alias cannot substitute a different field for Image.'
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Reset-Evidence;$script:definition.detection.condition='selection and not filter';Save-Artifact normalizedRule $script:definition;$script:review.normalizedRuleSha256=$script:record.artifacts.normalizedRule.sha256;Save-Artifact review $script:review;Assert-NotReady 'Unsupported complete Boolean logic is not partially evaluated.'
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Reset-Evidence;$script:definition.detection.selection['Image|endswith']='notepad.exe';Save-Artifact normalizedRule $script:definition;$script:review.normalizedRuleSha256=$script:record.artifacts.normalizedRule.sha256;Save-Artifact review $script:review;Assert-NotReady 'Unsupported field modifiers cannot be silently ignored.'
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Reset-Evidence;$script:definition.logsource.service='sysmon';Save-Artifact normalizedRule $script:definition;$script:review.normalizedRuleSha256=$script:record.artifacts.normalizedRule.sha256;Save-Artifact review $script:review;Assert-NotReady 'A Sysmon source cannot use native Security evidence.'
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Reset-Evidence;$script:definition.detection.selection.Hashes='abc';$script:record.fieldMappings.Hashes='EventData.NewProcessName';Save-Artifact normalizedRule $script:definition;$script:review.normalizedRuleSha256=$script:record.artifacts.normalizedRule.sha256;Save-Artifact review $script:review;Assert-NotReady 'A fabricated hash alias cannot turn process names into rich 4688 fields.'
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Reset-Evidence;$script:queryResult.matched=$false;Save-Artifact queryResult $script:queryResult;Assert-NotReady 'Successful collection without a query match is not Ready.'
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Reset-Evidence;$script:queryResult.exitCode=1;Save-Artifact queryResult $script:queryResult;Assert-NotReady 'Failed query execution cannot be overridden by matched=true.'
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Reset-Evidence;$script:ingestion.normalizedFields.Image='wrong.exe';Save-Artifact ingestion $script:ingestion;Assert-NotReady 'Backend normalization must preserve the required source field.'
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Reset-Evidence;$script:before.capturedAtUtc='2020-01-01T00:00:00Z';Save-Artifact beforeState $script:before;Assert-NotReady 'Stale evidence cannot silently establish present eligibility.'
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Reset-Evidence;$script:after.capturedAtUtc='2040-01-01T00:00:00Z';Save-Artifact afterState $script:after;Assert-NotReady 'A future after-state snapshot cannot grant readiness.'
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Reset-Evidence;$script:after.capturedAtUtc='2026-09-19T10:06:00Z';Save-Artifact afterState $script:after;Assert-NotReady 'A review cannot certify a state snapshot captured later.'
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Reset-Evidence;Save-Artifact eventXml '<!DOCTYPE Event [<!ENTITY x SYSTEM "file:///etc/passwd">]><Event>&x;</Event>' -Text;Assert-NotReady 'DTD/external entities are rejected.'
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Reset-Evidence;Save-Artifact queryResult '{"matched":false,"matched":true}' -Text;Assert-NotReady 'Duplicate JSON keys are rejected on both PowerShell editions.'
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Reset-Evidence;Save-Artifact queryResult '{"matched":false,"MATCHED":true}' -Text;Assert-NotReady 'Case-colliding JSON keys cannot change evidence meaning.'
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Reset-Evidence;$r=Get-WelaRuleEligibility -CorpusPath $corpusPath -ManifestPath $manifestPath -EvidencePath $bundlePath -Role DomainController -Now $now
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Assert ($r.Summary.Ready -eq 0) 'Imported host role must match an explicit assessment filter.'
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Reset-Evidence;$script:record.id='unknown-rule';Save-Bundle;Assert-Throws { Report -Evidence } 'Evidence for a rule absent from the pinned corpus is rejected.'
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$originalMappingPath=$mappingPath
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try {
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$mappingPath=Join-Path $root 'invalid-mapping.csv'
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[IO.File]::WriteAllText($mappingPath, [IO.File]::ReadAllText($originalMappingPath).Replace('"4688","Detailed Tracking","Process Creation"','"4688","Detailed Tracking","RPC Events"'))
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Reset-Evidence;$r=Report -Evidence
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Assert ($r.Summary.Ready -eq 0 -and $r.Results[0].Reasons -contains 'AuditMappingAmbiguousOrUnknown') 'A known GUID with the wrong canonical name cannot grant Ready.'
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} finally { $mappingPath=$originalMappingPath }
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# Exercise only the option guard, never a mutating CLI dispatch.
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$tokens=$null;$errors=$null
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$ast=[Management.Automation.Language.Parser]::ParseFile((Join-Path $PSScriptRoot '../WELA.ps1'),[ref]$tokens,[ref]$errors)
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Assert ($errors.Count -eq 0) 'The public CLI parses with eligibility options.'
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$guard=$ast.EndBlock.Statements | Where-Object { $_ -is [Management.Automation.Language.IfStatementAst] -and $_.Extent.Text.StartsWith("if (`$Cmd -ne 'rule-eligibility'") } | Select-Object -First 1
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Assert ($null -ne $guard) 'Dedicated eligibility options have a public pre-dispatch guard.'
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$exercise=[scriptblock]::Create('param($Cmd,$RuleEvidencePath,$RuleCorpusPath,$RuleManifestPath)' + [Environment]::NewLine + $guard.Extent.Text)
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Assert-Throws { & $exercise -Cmd configure -RuleEvidencePath '' } 'Even an explicitly empty evidence option is not silently ignored by configure.'
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& $exercise -Cmd rule-eligibility -RuleEvidencePath 'operator.json'
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$timer=[Diagnostics.Stopwatch]::StartNew();$full=Get-WelaRuleEligibility
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$pinDiagnostic='Full shipped corpus/manifest mismatch. Corpus SHA256 actual={0}, expected={1}; mapping SHA256 actual={2}, expected={3}; input count actual={4}, expected={5}; unique count actual={6}, expected={7}.' -f $full.Corpus.Sha256,$full.Corpus.Manifest.corpusSha256,$full.Corpus.MappingSha256,$full.Corpus.Manifest.mappingSha256,$full.Summary.InputRecords,$full.Corpus.Manifest.recordCount,$full.Summary.UniqueRules,$full.Corpus.Manifest.uniqueRuleCount
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Assert ($full.Corpus.Pinned -and $full.Summary.InputRecords -eq $full.Corpus.Manifest.recordCount -and $full.Summary.UniqueRules -eq $full.Corpus.Manifest.uniqueRuleCount) $pinDiagnostic
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Assert ($full.Summary.Ready -eq 0 -and ($full.Summary.NativeCandidates+$full.Summary.Excluded) -eq $full.Summary.UniqueRules) 'Full corpus is partitioned without unverified detection credit.'
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$json=Join-Path $root 'full.json';$html=Join-Path $root 'full.html'
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Export-WelaRuleEligibility -Report $full -ResultsPath $json -HtmlPath $html
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Assert ((Get-Item $json).Length -lt 8388608 -and (Get-Item $html).Length -lt 8388608) 'Full per-rule reports stay below 8 MiB each.'
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Assert ($timer.Elapsed.TotalSeconds -lt 180) 'Full-corpus assessment/export completes within a bounded three-minute budget.'
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Write-Host ('Full corpus: {0} unique rules, {1:N1}s, JSON {2} bytes.' -f $full.Summary.UniqueRules,$timer.Elapsed.TotalSeconds,(Get-Item $json).Length)
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Write-Host "PASS: $checks native rule eligibility assertions. Evidence is synthetic; no Windows event or backend query was generated."
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} finally { Remove-Item -LiteralPath $root -Recurse -Force -ErrorAction SilentlyContinue }
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