Unassigned Policies Monitor

<#
.TITLE
    Unassigned Policies Monitor

.SYNOPSIS
    Identify and report on all unassigned policies in Microsoft Intune.

.DESCRIPTION
    This script connects to Microsoft Graph and retrieves all device configuration policies
    configured in Intune, then checks which policies have no assignments to users, groups,
    or devices. Unassigned policies represent potential configuration drift, unused resources,
    or incomplete policy deployment. The script generates detailed reports in CSV format,
    highlighting unassigned policies with creation dates, policy types, and recommendations.
    This helps administrators maintain clean policy governance and identify policies that
    may need assignment or removal.

.TAGS
    Monitoring

.MINROLE
    Intune Administrator

.PERMISSIONS
    DeviceManagementConfiguration.Read.All

.AUTHOR
    Ugur Koc

.VERSION
    1.0

.CHANGELOG
    1.0 - Initial release

.LASTUPDATE
    2025-05-29

.EXAMPLE
    .\check-unassigned-policies.ps1
    Generates a report of all unassigned policies

.EXAMPLE
    .\check-unassigned-policies.ps1 -OutputPath "C:\Reports" -IncludeDetails
    Generates a detailed report and saves to specified directory

.EXAMPLE
    .\check-unassigned-policies.ps1 -CreatedWithinDays 7
    Generates report for policies created in the last 7 days

.NOTES
    - Requires Microsoft.Graph.Authentication module: Install-Module Microsoft.Graph.Authentication
    - Requires appropriate permissions in Azure AD
    - Checks all policy types: Device Configuration, Settings Catalog, Administrative Templates
    - Unassigned policies may indicate incomplete deployment or unused configurations
    - Regular monitoring helps maintain policy governance and compliance
    - Consider removing or assigning policies that have been unassigned for extended periods
#>

[CmdletBinding()]
param(
    [Parameter(Mandatory = $false, HelpMessage = "Directory path to save reports")]
    [ValidateNotNullOrEmpty()]
    [string]$OutputPath = ".",
    
    [Parameter(Mandatory = $false, HelpMessage = "Include detailed policy information")]
    [switch]$IncludeDetails,
    
    [Parameter(Mandatory = $false, HelpMessage = "Show only policies created in the last N days")]
    [ValidateRange(1, 365)]
    [int]$CreatedWithinDays = 0,
    
    [Parameter(Mandatory = $false, HelpMessage = "Force module installation without prompting")]
    [switch]$ForceModuleInstall
)

# ============================================================================
# ENVIRONMENT DETECTION AND SETUP
# ============================================================================

function Initialize-RequiredModule {
    <#
    .SYNOPSIS
    Ensures required modules are available and loaded
    #>
    param(
        [string[]]$ModuleNames,
        [bool]$IsAutomationEnvironment,
        [bool]$ForceInstall = $false
    )
    
    foreach ($ModuleName in $ModuleNames) {
        Write-Verbose "Checking module: $ModuleName"
        
        # Check if module is available
        $module = Get-Module -ListAvailable -Name $ModuleName | Select-Object -First 1
        
        if (-not $module) {
            if ($IsAutomationEnvironment) {
                $errorMessage = @"
Module '$ModuleName' is not available in this Azure Automation Account.

To resolve this issue:
1. Go to Azure Portal
2. Navigate to your Automation Account
3. Go to 'Modules' > 'Browse Gallery'
4. Search for '$ModuleName'
5. Click 'Import' and wait for installation to complete

Alternative: Use PowerShell to import the module:
Import-Module Az.Automation
Import-AzAutomationModule -AutomationAccountName "YourAccount" -ResourceGroupName "YourRG" -Name "$ModuleName"
"@
                throw $errorMessage
            }
            else {
                # Local environment - attempt to install
                Write-Information "Module '$ModuleName' not found. Attempting to install..." -InformationAction Continue
                
                if (-not $ForceInstall) {
                    $response = Read-Host "Install module '$ModuleName'? (Y/N)"
                    if ($response -notmatch '^[Yy]') {
                        throw "Module '$ModuleName' is required but installation was declined."
                    }
                }
                
                try {
                    # Check if running as administrator for AllUsers scope
                    $isAdmin = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")
                    $scope = if ($isAdmin) { "AllUsers" } else { "CurrentUser" }
                    
                    Write-Information "Installing '$ModuleName' in scope '$scope'..." -InformationAction Continue
                    Install-Module -Name $ModuleName -Scope $scope -Force -AllowClobber -Repository PSGallery
                    Write-Information "✓ Successfully installed '$ModuleName'" -InformationAction Continue
                }
                catch {
                    throw "Failed to install module '$ModuleName': $($_.Exception.Message)"
                }
            }
        }
        
        # Import the module
        try {
            Write-Verbose "Importing module: $ModuleName"
            Import-Module -Name $ModuleName -Force -ErrorAction Stop
            Write-Verbose "✓ Successfully imported '$ModuleName'"
        }
        catch {
            throw "Failed to import module '$ModuleName': $($_.Exception.Message)"
        }
    }
}

# Detect execution environment
if ($PSPrivateMetadata.JobId.Guid) {
    Write-Output "Running inside Azure Automation Runbook"
    $IsAzureAutomation = $true
}
else {
    Write-Information "Running locally in IDE or terminal" -InformationAction Continue
    $IsAzureAutomation = $false
}

# Initialize required modules
$RequiredModules = @(
    "Microsoft.Graph.Authentication"
)

try {
    Initialize-RequiredModule -ModuleNames $RequiredModules -IsAutomationEnvironment $IsAzureAutomation -ForceInstall $ForceModuleInstall
    Write-Verbose "✓ All required modules are available"
}
catch {
    Write-Error "Module initialization failed: $_"
    exit 1
}

# ============================================================================
# AUTHENTICATION
# ============================================================================

try {
    if ($IsAzureAutomation) {
        # Azure Automation - Use Managed Identity
        Write-Output "Connecting to Microsoft Graph using Managed Identity..."
        Connect-MgGraph -Identity -NoWelcome -ErrorAction Stop
        Write-Output "✓ Successfully connected to Microsoft Graph using Managed Identity"
    }
    else {
        # Local execution - Use interactive authentication
        Write-Information "Connecting to Microsoft Graph with interactive authentication..." -InformationAction Continue
        $Scopes = @(
            "DeviceManagementConfiguration.Read.All"
        )
        Connect-MgGraph -Scopes $Scopes -NoWelcome -ErrorAction Stop
        Write-Information "✓ Successfully connected to Microsoft Graph" -InformationAction Continue
    }
}
catch {
    Write-Error "Failed to connect to Microsoft Graph: $($_.Exception.Message)"
    exit 1
}

# ============================================================================
# HELPER FUNCTIONS
# ============================================================================

# Function to get all pages of results from Graph API
function Get-MgGraphAllPage {
    param(
        [Parameter(Mandatory = $true)]
        [string]$Uri,
        [int]$DelayMs = 100
    )
    
    $AllResults = @()
    $NextLink = $Uri
    $RequestCount = 0
    
    do {
        try {
            # Add delay to respect rate limits
            if ($RequestCount -gt 0) {
                Start-Sleep -Milliseconds $DelayMs
            }
            
            $Response = Invoke-MgGraphRequest -Uri $NextLink -Method GET
            $RequestCount++
            
            if ($Response.value) {
                $AllResults += $Response.value
            }
            else {
                $AllResults += $Response
            }
            
            $NextLink = $Response.'@odata.nextLink'
        }
        catch {
            if ($_.Exception.Message -like "*429*" -or $_.Exception.Message -like "*throttled*") {
                Write-Information "`nRate limit hit, waiting 60 seconds..." -InformationAction Continue
                Start-Sleep -Seconds 60
                continue
            }
            Write-Warning "Error fetching data from $NextLink : $($_.Exception.Message)"
            break
        }
    } while ($NextLink)
    
    return $AllResults
}

# Function to get policy assignments
function Get-PolicyAssignment {
    param(
        [Parameter(Mandatory = $true)]
        [string]$PolicyId,
        [Parameter(Mandatory = $true)]
        [string]$PolicyType
    )
    
    try {
        switch ($PolicyType) {
            "DeviceConfiguration" {
                $AssignmentsUri = "https://graph.microsoft.com/beta/deviceManagement/deviceConfigurations('$PolicyId')/assignments"
            }
            "ConfigurationPolicy" {
                $AssignmentsUri = "https://graph.microsoft.com/beta/deviceManagement/configurationPolicies('$PolicyId')/assignments"
            }
            "GroupPolicyConfiguration" {
                $AssignmentsUri = "https://graph.microsoft.com/beta/deviceManagement/groupPolicyConfigurations('$PolicyId')/assignments"
            }
            default {
                $AssignmentsUri = "https://graph.microsoft.com/beta/deviceManagement/deviceConfigurations('$PolicyId')/assignments"
            }
        }
        
        $Assignments = Get-MgGraphAllPage -Uri $AssignmentsUri
        return $Assignments
    }
    catch {
        Write-Warning "Failed to get assignments for policy $PolicyId : $($_.Exception.Message)"
        return @()
    }
}

# Function to determine policy risk level
function Get-PolicyRiskLevel {
    param(
        [string]$PolicyName,
        [datetime]$CreatedDateTime,
        [string]$PolicyType
    )
    
    $DaysOld = (Get-Date) - $CreatedDateTime
    
    # High risk: Security-related policies that are unassigned
    if ($PolicyName -match "(Security|Firewall|BitLocker|Defender|Encryption|Password|PIN)") {
        return "High"
    }
    
    # High risk: Compliance policies that are unassigned
    if ($PolicyType -match "(Compliance|DeviceCompliance)") {
        return "High"
    }
    
    # Medium risk: Policies older than 30 days
    if ($DaysOld.Days -gt 30) {
        return "Medium"
    }
    
    # Low risk: Recently created policies
    return "Low"
}

# Function to format policy details
function Format-PolicyDetail {
    param(
        [object]$Policy,
        [string]$PolicyType
    )
    
    $Details = @()
    
    if ($PolicyType -eq "ConfigurationPolicy" -and $Policy.templateReference) {
        $Details += "Template: $($Policy.templateReference.templateDisplayName)"
        $Details += "Template Version: $($Policy.templateReference.templateDisplayVersion)"
    }
    
    if ($Policy.platforms) {
        $Details += "Platforms: $($Policy.platforms -join ', ')"
    }
    
    if ($Policy.technologies) {
        $Details += "Technologies: $($Policy.technologies -join ', ')"
    }
    
    if ($Policy.settingCount) {
        $Details += "Settings Count: $($Policy.settingCount)"
    }
    
    return $Details -join "; "
}

# ============================================================================
# MAIN SCRIPT LOGIC
# ============================================================================

try {
    Write-Information "Starting unassigned policies analysis..." -InformationAction Continue
    
    # Calculate filter date if specified
    $FilterDate = $null
    if ($CreatedWithinDays -gt 0) {
        $FilterDate = (Get-Date).AddDays(-$CreatedWithinDays)
        Write-Information "Filtering policies created after: $($FilterDate.ToString('yyyy-MM-dd'))" -InformationAction Continue
    }
    
    # ========================================================================
    # GET ALL DEVICE CONFIGURATION POLICIES
    # ========================================================================
    
    Write-Information "Retrieving device configuration policies..." -InformationAction Continue
    
    $AllUnassignedPolicies = @()
    
    try {
        # Get traditional device configuration policies
        $DeviceConfigUri = "https://graph.microsoft.com/beta/deviceManagement/deviceConfigurations"
        $DeviceConfigurations = Get-MgGraphAllPage -Uri $DeviceConfigUri
        Write-Information "Retrieved $($DeviceConfigurations.Count) device configuration policies" -InformationAction Continue
        
        # Get Settings Catalog policies (Configuration Policies)
        $ConfigPoliciesUri = "https://graph.microsoft.com/beta/deviceManagement/configurationPolicies"
        $ConfigurationPolicies = Get-MgGraphAllPage -Uri $ConfigPoliciesUri
        Write-Information "Retrieved $($ConfigurationPolicies.Count) settings catalog policies" -InformationAction Continue
        
        # Get Administrative Templates (Group Policy Configurations)
        $GroupPolicyUri = "https://graph.microsoft.com/beta/deviceManagement/groupPolicyConfigurations"
        $GroupPolicyConfigurations = Get-MgGraphAllPage -Uri $GroupPolicyUri
        Write-Information "Retrieved $($GroupPolicyConfigurations.Count) administrative template policies" -InformationAction Continue
    }
    catch {
        Write-Error "Failed to retrieve policies: $($_.Exception.Message)"
        exit 1
    }
    
    # ========================================================================
    # CHECK ASSIGNMENTS FOR EACH POLICY TYPE
    # ========================================================================
    
    Write-Information "Checking policy assignments..." -InformationAction Continue
    
    # Check Device Configuration Policies
    Write-Information "Analyzing device configuration policies..." -InformationAction Continue
    foreach ($Policy in $DeviceConfigurations) {
        try {
            # Apply date filter if specified
            if ($FilterDate -and $Policy.createdDateTime) {
                $CreatedDate = [datetime]$Policy.createdDateTime
                if ($CreatedDate -lt $FilterDate) {
                    continue
                }
            }
            
            $Assignments = Get-PolicyAssignment -PolicyId $Policy.id -PolicyType "DeviceConfiguration"
            
            if ($Assignments.Count -eq 0) {
                $RiskLevel = Get-PolicyRiskLevel -PolicyName $Policy.displayName -CreatedDateTime ([datetime]$Policy.createdDateTime) -PolicyType "DeviceConfiguration"
                $Details = if ($IncludeDetails) { Format-PolicyDetail -Policy $Policy -PolicyType "DeviceConfiguration" } else { "" }
                
                $UnassignedPolicy = [PSCustomObject]@{
                    PolicyName      = $Policy.displayName
                    PolicyType      = "Device Configuration"
                    PolicySubType   = $Policy.'@odata.type' -replace '#microsoft.graph.', ''
                    CreatedDateTime = $Policy.createdDateTime
                    LastModified    = $Policy.lastModifiedDateTime
                    RiskLevel       = $RiskLevel
                    Description     = $Policy.description
                    Details         = $Details
                    PolicyId        = $Policy.id
                }
                $AllUnassignedPolicies += $UnassignedPolicy
            }
        }
        catch {
            Write-Warning "Error processing device configuration policy '$($Policy.displayName)': $($_.Exception.Message)"
            continue
        }
    }
    
    # Check Settings Catalog Policies
    Write-Information "Analyzing settings catalog policies..." -InformationAction Continue
    foreach ($Policy in $ConfigurationPolicies) {
        try {
            # Apply date filter if specified
            if ($FilterDate -and $Policy.createdDateTime) {
                $CreatedDate = [datetime]$Policy.createdDateTime
                if ($CreatedDate -lt $FilterDate) {
                    continue
                }
            }
            
            $Assignments = Get-PolicyAssignment -PolicyId $Policy.id -PolicyType "ConfigurationPolicy"
            
            if ($Assignments.Count -eq 0) {
                $RiskLevel = Get-PolicyRiskLevel -PolicyName $Policy.name -CreatedDateTime ([datetime]$Policy.createdDateTime) -PolicyType "ConfigurationPolicy"
                $Details = if ($IncludeDetails) { Format-PolicyDetail -Policy $Policy -PolicyType "ConfigurationPolicy" } else { "" }
                
                $UnassignedPolicy = [PSCustomObject]@{
                    PolicyName      = $Policy.name
                    PolicyType      = "Settings Catalog"
                    PolicySubType   = if ($Policy.templateReference) { $Policy.templateReference.templateDisplayName } else { "Custom" }
                    CreatedDateTime = $Policy.createdDateTime
                    LastModified    = $Policy.lastModifiedDateTime
                    RiskLevel       = $RiskLevel
                    Description     = $Policy.description
                    Details         = $Details
                    PolicyId        = $Policy.id
                }
                $AllUnassignedPolicies += $UnassignedPolicy
            }
        }
        catch {
            Write-Warning "Error processing settings catalog policy '$($Policy.name)': $($_.Exception.Message)"
            continue
        }
    }
    
    # Check Administrative Template Policies
    Write-Information "Analyzing administrative template policies..." -InformationAction Continue
    foreach ($Policy in $GroupPolicyConfigurations) {
        try {
            # Apply date filter if specified
            if ($FilterDate -and $Policy.createdDateTime) {
                $CreatedDate = [datetime]$Policy.createdDateTime
                if ($CreatedDate -lt $FilterDate) {
                    continue
                }
            }
            
            $Assignments = Get-PolicyAssignment -PolicyId $Policy.id -PolicyType "GroupPolicyConfiguration"
            
            if ($Assignments.Count -eq 0) {
                $RiskLevel = Get-PolicyRiskLevel -PolicyName $Policy.displayName -CreatedDateTime ([datetime]$Policy.createdDateTime) -PolicyType "GroupPolicyConfiguration"
                $Details = if ($IncludeDetails) { Format-PolicyDetail -Policy $Policy -PolicyType "GroupPolicyConfiguration" } else { "" }
                
                $UnassignedPolicy = [PSCustomObject]@{
                    PolicyName      = $Policy.displayName
                    PolicyType      = "Administrative Template"
                    PolicySubType   = "Group Policy"
                    CreatedDateTime = $Policy.createdDateTime
                    LastModified    = $Policy.lastModifiedDateTime
                    RiskLevel       = $RiskLevel
                    Description     = $Policy.description
                    Details         = $Details
                    PolicyId        = $Policy.id
                }
                $AllUnassignedPolicies += $UnassignedPolicy
            }
        }
        catch {
            Write-Warning "Error processing administrative template policy '$($Policy.displayName)': $($_.Exception.Message)"
            continue
        }
    }
    
    # ========================================================================
    # DISPLAY RESULTS
    # ========================================================================
    
    Write-Information "`n========================================" -InformationAction Continue
    Write-Information "UNASSIGNED POLICIES ANALYSIS RESULTS" -InformationAction Continue
    Write-Information "========================================" -InformationAction Continue
    
    if ($AllUnassignedPolicies.Count -eq 0) {
        Write-Information "✓ No unassigned policies found!" -InformationAction Continue
        if ($FilterDate) {
            Write-Information "  (Checked policies created after $($FilterDate.ToString('yyyy-MM-dd')))" -InformationAction Continue
        }
    }
    else {
        Write-Information "Found $($AllUnassignedPolicies.Count) unassigned policies:" -InformationAction Continue
        
        # Group by risk level
        $HighRisk = $AllUnassignedPolicies | Where-Object { $_.RiskLevel -eq "High" }
        $MediumRisk = $AllUnassignedPolicies | Where-Object { $_.RiskLevel -eq "Medium" }
        $LowRisk = $AllUnassignedPolicies | Where-Object { $_.RiskLevel -eq "Low" }
        
        Write-Information "`nRisk Level Summary:" -InformationAction Continue
        Write-Information "  High Risk: $($HighRisk.Count) policies" -InformationAction Continue
        Write-Information "  Medium Risk: $($MediumRisk.Count) policies" -InformationAction Continue
        Write-Information "  Low Risk: $($LowRisk.Count) policies" -InformationAction Continue
        
        # Display top 10 unassigned policies
        Write-Information "`nTop 10 Unassigned Policies (by risk level):" -InformationAction Continue
        $TopPolicies = $AllUnassignedPolicies | Sort-Object @{Expression = {
                switch ($_.RiskLevel) {
                    "High" { 1 }
                    "Medium" { 2 }
                    "Low" { 3 }
                }
            }
        }, CreatedDateTime | Select-Object -First 10
        
        $PolicyNumber = 1
        foreach ($Policy in $TopPolicies) {
            Write-Information "`n[$PolicyNumber] $($Policy.PolicyName)" -InformationAction Continue
            Write-Information "  Type: $($Policy.PolicyType) ($($Policy.PolicySubType))" -InformationAction Continue
            Write-Information "  Created: $($Policy.CreatedDateTime)" -InformationAction Continue
            Write-Information "  Risk Level: $($Policy.RiskLevel)" -InformationAction Continue
            if ($Policy.Description) {
                Write-Information "  Description: $($Policy.Description)" -InformationAction Continue
            }
            if ($IncludeDetails -and $Policy.Details) {
                Write-Information "  Details: $($Policy.Details)" -InformationAction Continue
            }
            $PolicyNumber++
        }
    }
    
    # ========================================================================
    # EXPORT TO CSV
    # ========================================================================
    
    if ($AllUnassignedPolicies.Count -gt 0) {
        $OutputFile = Join-Path -Path $OutputPath -ChildPath "UnassignedPolicies_$(Get-Date -Format 'yyyyMMdd_HHmmss').csv"
        try {
            $AllUnassignedPolicies | Export-Csv -Path $OutputFile -NoTypeInformation -Encoding UTF8
            Write-Information "✓ Report exported to: $OutputFile" -InformationAction Continue
        }
        catch {
            Write-Warning "Failed to export CSV report: $($_.Exception.Message)"
        }
    }
    
    Write-Information "`n✓ Unassigned policies analysis completed successfully" -InformationAction Continue
}
catch {
    Write-Error "Script failed: $($_.Exception.Message)"
    exit 1
}
finally {
    # Cleanup operations
    try {
        Disconnect-MgGraph -ErrorAction SilentlyContinue | Out-Null
        Write-Information "Disconnected from Microsoft Graph" -InformationAction Continue
    }
    catch {
        Write-Warning "Failed to disconnect from Microsoft Graph: $($_.Exception.Message)"
    }
}

# ============================================================================
# SCRIPT SUMMARY
# ============================================================================

Write-Information "
========================================
Script Execution Summary
========================================
Script: Unassigned Policies Monitor
Total Policies Checked: $($DeviceConfigurations.Count + $ConfigurationPolicies.Count + $GroupPolicyConfigurations.Count)
Unassigned Policies Found: $($AllUnassignedPolicies.Count)
Status: Completed
========================================
" -InformationAction Continue