functions/Test-PIMPolicyDrift.ps1
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<#
.SYNOPSIS Tests PIM role assignment policy configuration for drift against live settings. .DESCRIPTION Reads a policy configuration JSON file (with optional templates), resolves the expected settings for Entra roles, Azure resource roles, and group roles, and compares them with the live PIM policies in the specified tenant. Reports matches, drift, and errors. Optionally throws when drift is detected. .PARAMETER TenantId The Entra tenant ID to query for PIM policy settings. .PARAMETER ConfigPath Path to the JSON configuration file describing expected PIM policies. Supports line comments (//) and block comments (/* */) which will be removed before parsing. .PARAMETER SubscriptionId Optional Azure subscription ID. Required if the config includes Azure resource role policies to validate. .PARAMETER FailOnDrift If set, throws an error when any policy drift or error is detected. .PARAMETER PassThru If set, suppresses formatted console output and is intended for use in pipelines. Note: The function always returns the results array; PassThru only affects host output. .INPUTS None. You cannot pipe objects to this function. .OUTPUTS PSCustomObject. One object per evaluated policy with properties: Type, Name, Target, Status (Match|Drift|Error|SkippedRoleNotFound), Differences. .EXAMPLE Test-PIMPolicyDrift -TenantId 00000000-0000-0000-0000-000000000000 -ConfigPath .\examples\scripts\pim-policies.json Compares Entra and group role policies from the config to live settings in the tenant. .EXAMPLE Test-PIMPolicyDrift -TenantId 00000000-0000-0000-0000-000000000000 -ConfigPath .\config\pim.json -SubscriptionId 11111111-1111-1111-1111-111111111111 -FailOnDrift -Verbose Validates Entra, group, and Azure resource role policies and throws if drift is found. .EXAMPLE Test-PIMPolicyDrift -TenantId $env:TenantId -ConfigPath .\config\pim.json -PassThru | Where-Object Status -ne 'Match' Returns only the items where drift or error is present. .NOTES Module: EasyPIM.Orchestrator (requires EasyPIM core module) Author: Kayasax and contributors License: MIT (same as EasyPIM) Authentication Context and MFA Requirements: Microsoft Entra PIM automatically removes MultiFactorAuthentication requirements when Authentication Context is enabled to prevent MfaAndAcrsConflict. This is expected behavior and will not be flagged as drift by this function. .LINK https://github.com/kayasax/EasyPIM #> # Public wrapper: moved from internal/functions to functions to satisfy manifest export tests. function Test-PIMPolicyDrift { [CmdletBinding()] [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSAvoidUsingPositionalParameters", "", Justification="Parameters are named at call sites; internal helper calls may trigger false positives.")] param( [Parameter(Mandatory)][string]$TenantId, [Parameter(Mandatory)][string]$ConfigPath, [string]$SubscriptionId, [switch]$FailOnDrift, [switch]$PassThru ) Write-Verbose -Message "Starting PIM policy drift test for config: $ConfigPath" try { $ConfigPath = (Resolve-Path -Path $ConfigPath -ErrorAction Stop).Path } catch { throw "Config file not found: $ConfigPath" } function Remove-JsonComments { param([string]$Content) $noBlock = [regex]::Replace($Content,'(?s)/\*.*?\*/','') $noFullLine = [regex]::Replace($noBlock,'(?m)^[ \t]*//.*?$','') $sb = New-Object -TypeName System.Text.StringBuilder foreach ($line in $noFullLine -split "`n") { $inString = $false; $escaped=$false; $out = New-Object -TypeName System.Text.StringBuilder for ($i=0; $i -lt $line.Length; $i++) { $ch = $line[$i] if ($escaped) { [void]$out.Append($ch); $escaped=$false; continue } if ($ch -eq '\\') { $escaped=$true; [void]$out.Append($ch); continue } if ($ch -eq '"') { $inString = -not $inString; [void]$out.Append($ch); continue } if (-not $inString -and $ch -eq '/' -and $i+1 -lt $line.Length -and $line[$i+1] -eq '/') { break } [void]$out.Append($ch) } [void]$sb.AppendLine(($out.ToString())) } return $sb.ToString() } $configRaw = Get-Content -Raw -Path $ConfigPath try { $clean = Remove-JsonComments -Content $configRaw $json = $clean | ConvertFrom-Json -ErrorAction Stop } catch { Write-Verbose -Message "Raw first 200: $($configRaw.Substring(0,[Math]::Min(200,$configRaw.Length)))" throw "Failed to parse config: $($_.Exception.Message)" } if (-not $json) { throw "Parsed JSON object is null - invalid configuration." } function Get-ResolvedPolicyObject { param([Parameter(Mandatory)][object]$Policy); if ($Policy.PSObject.Properties['ResolvedPolicy'] -and $Policy.ResolvedPolicy) { return $Policy.ResolvedPolicy }; return $Policy } $expectedAzure=@(); $expectedEntra=@(); $expectedGroup=@(); $templates=@{} if ($json.PSObject.Properties['PolicyTemplates']) { foreach ($t in ($json.PolicyTemplates | Get-Member -MemberType NoteProperty | Select-Object -ExpandProperty Name)) { $templates[$t] = $json.PolicyTemplates.$t } } function Resolve-Template { param([Parameter(Mandatory)]$Object) if (-not $Object) { return $Object }; if ($Object.Template -and $templates.ContainsKey($Object.Template)) { $base = $templates[$Object.Template] | ConvertTo-Json -Depth 20 | ConvertFrom-Json; foreach ($p in $Object.PSObject.Properties) { $base | Add-Member -NotePropertyName $p.Name -NotePropertyValue $p.Value -Force }; return $base }; return $Object } if ($json.PSObject.Properties['AzureRolePolicies']) { $expectedAzure += $json.AzureRolePolicies } if ($json.PSObject.Properties['EntraRolePolicies']) { $expectedEntra += $json.EntraRolePolicies } if ($json.PSObject.Properties['GroupPolicies']) { $expectedGroup += $json.GroupPolicies } if ($json.PSObject.Properties['AzureRoles'] -and $json.AzureRoles.PSObject.Properties['Policies']) { foreach ($prop in $json.AzureRoles.Policies.PSObject.Properties) { $roleName=$prop.Name; $p=$prop.Value; if (-not $p) { continue } $obj=[pscustomobject]@{ RoleName=$roleName; Scope=$p.Scope } foreach ($pp in $p.PSObject.Properties) { if ($pp.Name -notin @('Scope')) { $obj | Add-Member -NotePropertyName $pp.Name -NotePropertyValue $pp.Value -Force } } $expectedAzure += $obj } } if ($json.PSObject.Properties['EntraRoles'] -and $json.EntraRoles.PSObject.Properties['Policies']) { foreach ($prop in $json.EntraRoles.Policies.PSObject.Properties) { $roleName=$prop.Name; $p=$prop.Value; if (-not $p) { continue } $obj=[pscustomobject]@{ RoleName=$roleName } foreach ($pp in $p.PSObject.Properties) { $obj | Add-Member -NotePropertyName $pp.Name -NotePropertyValue $pp.Value -Force } $expectedEntra += $obj } } if ($json.PSObject.Properties['GroupRoles'] -and $json.GroupRoles.PSObject.Properties['Policies']) { foreach ($gprop in $json.GroupRoles.Policies.PSObject.Properties) { $groupId=$gprop.Name; $roleBlock=$gprop.Value; if (-not $roleBlock) { continue } foreach ($rprop in $roleBlock.PSObject.Properties) { $roleName=$rprop.Name; $p=$rprop.Value; if (-not $p) { continue } $obj=[pscustomobject]@{ GroupId=$groupId; RoleName=$roleName } foreach ($pp in $p.PSObject.Properties) { $obj | Add-Member -NotePropertyName $pp.Name -NotePropertyValue $pp.Value -Force } $expectedGroup += $obj } } } $expectedAzure = $expectedAzure | ForEach-Object -Process { $_ | Add-Member -NotePropertyName ResolvedPolicy -NotePropertyValue (Resolve-Template -Object $_) -Force; $_ } $expectedEntra = $expectedEntra | ForEach-Object -Process { $_ | Add-Member -NotePropertyName ResolvedPolicy -NotePropertyValue (Resolve-Template -Object $_) -Force; $_ } $expectedGroup = $expectedGroup | ForEach-Object -Process { $_ | Add-Member -NotePropertyName ResolvedPolicy -NotePropertyValue (Resolve-Template -Object $_) -Force; $_ } $fields = @('ActivationDuration','ActivationRequirement','ApprovalRequired','MaximumEligibilityDuration','AllowPermanentEligibility','MaximumActiveAssignmentDuration','AllowPermanentActiveAssignment') $liveNameMap = @{ 'ActivationRequirement'='EnablementRules'; 'MaximumEligibilityDuration'='MaximumEligibleAssignmentDuration'; 'AllowPermanentEligibility'='AllowPermanentEligibleAssignment' } $script:results=@(); $script:driftCount=0 function Convert-RequirementValue { param([string]$Value) if (-not $Value) { return '' } $v = $Value.Trim() if ($v -eq '') { return '' } if ($v -match '^(none|null|no(ne)?requirements?)$') { return '' } # Split on comma / semicolon $tokens = $v -split '[,;]+' | ForEach-Object { $_.Trim() } | Where-Object { $_ } $norm = foreach ($t in $tokens) { switch -Regex ($t) { '^(mfa|multifactorauthentication)$' { 'MFA'; break } '^(justification)$' { 'Justification'; break } default { $t } } } ($norm | Sort-Object -Unique) -join ',' } function Compare-Policy { param( [Parameter(Mandatory)][string]$Type, [Parameter(Mandatory)][string]$Name, [Parameter()][object]$Expected, [Parameter()][object]$Live, [Parameter()][string]$ExtraId=$null, [Parameter()][int]$ApproverCountExpected=$null ) $differences=@() foreach ($f in $fields) { if ($Expected.PSObject.Properties[$f]) { $exp=$Expected.$f; $liveProp=$f; if ($liveNameMap.ContainsKey($f)) { $liveProp=$liveNameMap[$f] } $liveVal=$null; if ($Live -and $Live.PSObject -and $Live.PSObject.Properties[$liveProp]) { $liveVal=$Live.$liveProp } if ($exp -is [System.Collections.IEnumerable] -and -not ($exp -is [string])) { $exp = ($exp | ForEach-Object { "$_" }) -join ',' } if ($liveVal -is [System.Collections.IEnumerable] -and -not ($liveVal -is [string])) { $liveVal = ($liveVal | ForEach-Object { "$_" }) -join ',' } if ($f -eq 'ActivationRequirement' -or $f -eq 'ActiveAssignmentRequirement') { $expNorm = Convert-RequirementValue -Value $exp $liveNorm = Convert-RequirementValue -Value $liveVal # Apply business rules validation using the internal function # Pass the entire Expected settings as PSCustomObject to maintain property access $policyForBusinessRules = [PSCustomObject]@{} $Expected.PSObject.Properties | ForEach-Object { $policyForBusinessRules | Add-Member -NotePropertyName $_.Name -NotePropertyValue $_.Value } $businessRuleResult = Test-PIMPolicyBusinessRules -PolicySettings $policyForBusinessRules -CurrentPolicy $Live -ApplyAdjustments $hasBusinessRuleAdjustment = $businessRuleResult.HasChanges if ($hasBusinessRuleAdjustment) { $adjustedExp = $businessRuleResult.AdjustedSettings.$f $adjustedExpNorm = Convert-RequirementValue -Value $adjustedExp if ($adjustedExpNorm -eq $liveNorm) { # This is expected behavior due to business rules, not drift if ($businessRuleResult.Conflicts -and $businessRuleResult.Conflicts.Count -gt 0) { Write-Verbose "$Name - Business rule applied: $($businessRuleResult.Conflicts[0]) (expected behavior, not drift)" } continue # Skip adding to differences } else { # Still drift even after business rule adjustments $expNorm = $adjustedExpNorm $exp = $adjustedExp } } if ($expNorm -ne $liveNorm) { $displayExp = if ($null -eq $exp -or $exp -eq '' -or $exp -eq 'None') { 'None' } else { $exp } $displayLive = if ($null -eq $liveVal -or $liveVal -eq '' -or $liveVal -eq 'None') { 'None' } else { $liveVal } $driftMessage = "{0}: expected='{1}' actual='{2}'" -f $f,$displayExp,$displayLive # Add explanatory notes for business rule conflicts if ($hasBusinessRuleAdjustment) { $driftMessage += " (Note: Expected value adjusted for Authentication Context business rules)" } $differences += $driftMessage } } else { if ("$exp" -ne "$liveVal") { $differences += ("{0}: expected='{1}' actual='{2}'" -f $f,$exp,$liveVal) } } } } if ($null -ne $ApproverCountExpected -and $Expected.PSObject.Properties['ApprovalRequired'] -and $Expected.ApprovalRequired) { $liveApproverCount=$null foreach ($aprop in 'Approvers','Approver','Approval','approval','ApproverCount') { if ($Live.PSObject -and $Live.PSObject.Properties[$aprop]) { $val=$Live.$aprop if ($val -is [System.Collections.IEnumerable] -and -not ($val -is [string])) { $liveApproverCount=@($val).Count } elseif ($val -match '^[0-9]+$') { $liveApproverCount=[int]$val } if ($null -ne $liveApproverCount) { break } } } if ($null -ne $liveApproverCount -and $liveApproverCount -ne $ApproverCountExpected) { $differences += "ApproversCount: expected=$ApproverCountExpected actual=$liveApproverCount" } } if ($differences.Count -gt 0) { $script:driftCount++; $status='Drift' } else { $status='Match' } $script:results += [pscustomobject]@{ Type=$Type; Name=$Name; Target=$ExtraId; Status=$status; Differences=($differences -join '; ') } } if ($expectedAzure.Count -gt 0 -and -not $SubscriptionId) { Write-Warning -Message "Azure role policies present but no -SubscriptionId provided; skipping Azure role validation." } elseif ($expectedAzure.Count -gt 0) { foreach ($p in $expectedAzure) { $r = Get-ResolvedPolicyObject -Policy $p if (-not $p.Scope) { $script:results += [pscustomobject]@{ Type='AzureRole'; Name=$p.RoleName; Target='(missing scope)'; Status='Error'; Differences='Missing Scope' }; $script:driftCount++; continue } try { $live = Get-PIMAzureResourcePolicy -tenantID $TenantId -subscriptionID $SubscriptionId -rolename $p.RoleName -ErrorAction Stop if ($live -is [System.Collections.IEnumerable] -and -not ($live -is [string])) { $live = @($live)[0] } $approverCount = if ($r.Approvers) { $r.Approvers.Count } else { $null } Compare-Policy -Type 'AzureRole' -Name $p.RoleName -Expected $r -Live $live -ExtraId $p.Scope -ApproverCountExpected $approverCount } catch { $script:results += [pscustomobject]@{ Type='AzureRole'; Name=$p.RoleName; Target=$p.Scope; Status='Error'; Differences=$_.Exception.Message }; $script:driftCount++ } } } foreach ($p in $expectedEntra) { if ($p._RoleNotFound) { $script:results += [pscustomobject]@{ Type='EntraRole'; Name=$p.RoleName; Target='/'; Status='SkippedRoleNotFound'; Differences='' }; continue } $r = Get-ResolvedPolicyObject -Policy $p try { $live = Get-PIMEntraRolePolicy -tenantID $TenantId -rolename $p.RoleName -ErrorAction Stop if ($live -is [System.Collections.IEnumerable] -and -not ($live -is [string])) { $live = @($live)[0] } if (-not $live) { throw "Live policy returned null for role '$($p.RoleName)'" } $approverCount = if ($r.Approvers) { $r.Approvers.Count } else { $null } Compare-Policy -Type 'EntraRole' -Name $p.RoleName -Expected $r -Live $live -ApproverCountExpected $approverCount } catch { $script:results += [pscustomobject]@{ Type='EntraRole'; Name=$p.RoleName; Target='/'; Status='Error'; Differences=$_.Exception.Message }; $script:driftCount++ } } foreach ($p in $expectedGroup) { $r = Get-ResolvedPolicyObject -Policy $p if (-not $r.PSObject.Properties['ActivationRequirement'] -and $r.PSObject.Properties['EnablementRules'] -and $r.EnablementRules) { try { $r | Add-Member -NotePropertyName ActivationRequirement -NotePropertyValue $r.EnablementRules -Force } catch { $r.ActivationRequirement = $r.EnablementRules } } if (-not $r.PSObject.Properties['ActivationDuration'] -and $r.PSObject.Properties['Duration'] -and $r.Duration) { try { $r | Add-Member -NotePropertyName ActivationDuration -NotePropertyValue $r.Duration -Force } catch { $r.ActivationDuration = $r.Duration } } if (-not $p.GroupId -and $p.GroupName) { try { $endpoint = "groups?`$filter=displayName eq '$($p.GroupName.Replace("'","''"))'" $resp = invoke-graph -Endpoint $endpoint if ($resp.value -and $resp.value.Count -gt 0) { $p | Add-Member -NotePropertyName GroupId -NotePropertyValue $resp.value[0].id -Force } } catch { Write-Warning -Message "Group resolution failed for '$($p.GroupName)': $($_.Exception.Message)" } } $gid = $p.GroupId if (-not $gid) { $targetGroupRef = if ($p.GroupName) { $p.GroupName } else { '(unknown)' } $script:results += [pscustomobject]@{ Type='Group'; Name=$p.RoleName; Target=$targetGroupRef; Status='Error'; Differences='Missing GroupId' } $script:driftCount++ continue } try { $live = Get-PIMGroupPolicy -tenantID $TenantId -groupID $gid -type ($p.RoleName.ToLower()) -ErrorAction Stop if ($live -is [System.Collections.IEnumerable] -and -not ($live -is [string])) { $live = @($live)[0] } $approverCount = if ($r.Approvers) { $r.Approvers.Count } else { $null } Compare-Policy -Type 'Group' -Name $p.RoleName -Expected $r -Live $live -ExtraId $gid -ApproverCountExpected $approverCount } catch { $script:results += [pscustomobject]@{ Type='Group'; Name=$p.RoleName; Target=$gid; Status='Error'; Differences=$_.Exception.Message }; $script:driftCount++ } } if (-not $PassThru) { Write-Host -Object "Policy Verification Results:" -ForegroundColor Cyan $script:results | Sort-Object -Property Type, Name | Format-Table -AutoSize $summary = $script:results | Group-Object -Property Status | Select-Object -Property Name,Count Write-Host -Object "`nSummary:" -ForegroundColor Cyan $summary | Format-Table -AutoSize if ($script:results.Count -eq 0) { Write-Host -Object "No policies discovered in config (nothing compared)." -ForegroundColor Yellow } else { $script:driftCount = ($script:results | Where-Object { $_.Status -in 'Drift','Error' }).Count if ($script:driftCount -eq 0) { Write-Host -Object "All compared policy fields match expected values." -ForegroundColor Green } else { Write-Host -Object "Drift detected in $script:driftCount policy item(s)." -ForegroundColor Yellow } } } if ($FailOnDrift -and ($script:results | Where-Object -FilterScript { $_.Status -in 'Drift','Error' })) { throw "PIM policy drift detected." } return $script:results } |