mirror of
https://github.com/okieselbach/AutopilotMonitor.git
synced 2026-10-24 12:42:38 +00:00
Oliver Kieselbach
289 lines
12 KiB
PowerShell
289 lines
12 KiB
PowerShell
<#
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.SYNOPSIS
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Bootstrap script to deploy and start the Autopilot Monitor agent.
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.DESCRIPTION
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This script is designed to be deployed via Intune as a PowerShell Script during Autopilot.
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It runs VERY EARLY in the enrollment process (first Intune action) and:
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1. Creates a unique session ID for this enrollment
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2. Downloads the monitoring agent binaries
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3. Verifies integrity via SHA-256 hash from version.json
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4. Installs agent binaries (agent uses built-in backend URL or CLI override)
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5. Registers agent as Scheduled Task (runs on computer startup)
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6. Agent self-destructs when enrollment completes
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INTEGRITY VERIFICATION:
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The script downloads version.json from the same blob container as the agent ZIP.
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If version.json contains a "sha256" field, the downloaded ZIP is verified against it
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using SHA-256. This prevents tampering during download (MITM) and detects corrupted
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downloads. If the hash does not match, installation is aborted.
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For backward compatibility: if version.json does not contain a "sha256" field (older
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builds), the script falls back to the legacy Content-MD5 header check.
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.PARAMETER AgentDownloadUrl
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URL to download the agent binaries from (ZIP file)
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.EXAMPLE
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.\Install-AutopilotMonitor.ps1
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(Uses built-in backend URL from the agent)
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.NOTES
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- Agent is temporary and auto-removes after enrollment
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- Everything in C:\ProgramData\AutopilotMonitor (easy cleanup)
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- No Registry entries (clean machine after removal)
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- Scheduled Task survives reboots during enrollment
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- SHA-256 integrity verification since v1.0.706+
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#>
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[CmdletBinding()]
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param(
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[Parameter(Mandatory = $false)]
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[string]$AgentDownloadUrl = "https://autopilotmonitor.blob.core.windows.net/agent/AutopilotMonitor-Agent.zip",
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[Parameter(Mandatory = $false)]
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[int]$MaxOsAgeMinutes = 120
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)
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# Configuration - Everything in ProgramData for easy cleanup
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$AgentBasePath = "$env:ProgramData\AutopilotMonitor"
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$AgentBinPath = "$AgentBasePath\Agent"
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$AgentLogPath = "$AgentBasePath\Logs"
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$LogFile = "$AgentLogPath\bootstrap_agent.log"
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# Ensure directories exist
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New-Item -Path $AgentBasePath -ItemType Directory -Force -ErrorAction SilentlyContinue | Out-Null
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New-Item -Path $AgentBinPath -ItemType Directory -Force -ErrorAction SilentlyContinue | Out-Null
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New-Item -Path $AgentLogPath -ItemType Directory -Force -ErrorAction SilentlyContinue | Out-Null
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function Write-Log {
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param([string]$Message)
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$timestamp = Get-Date -Format "yyyy-MM-dd HH:mm:ss"
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$logMessage = "[$timestamp] $Message"
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Write-Output $logMessage
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Add-Content -Path $LogFile -Value $logMessage -ErrorAction SilentlyContinue
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}
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function Get-FileMd5Base64 {
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param(
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[Parameter(Mandatory = $true)]
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[string]$Path
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)
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$md5 = [System.Security.Cryptography.MD5]::Create()
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try {
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$stream = [System.IO.File]::OpenRead($Path)
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try {
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$hashBytes = $md5.ComputeHash($stream)
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}
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finally {
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$stream.Dispose()
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}
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return [Convert]::ToBase64String($hashBytes)
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}
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finally {
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$md5.Dispose()
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}
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}
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try {
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Write-Log "===== Autopilot Monitor Bootstrap Started ====="
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# ── Pre-flight: Skip installation on already-enrolled devices ──
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# Check 1: OS install date must be within threshold (fresh device)
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# TODO: issue is the OS might got installed a long time ago but the OOBE just started now (e.g. old image, or re-flash).
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# Ideally we want to detect the OOBE start time... need to investigate if there's a reliable way to get that (event log? registry? WMI?).
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# For now we just check OS install date as a proxy, which should work in most cases except for old images or re-flashed devices.
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$osInstallDate = (Get-CimInstance Win32_OperatingSystem).InstallDate
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$osAge = (Get-Date) - $osInstallDate
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$osAgeMinutesRounded = [int][Math]::Round($osAge.TotalMinutes)
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Write-Log "OS install date: $osInstallDate (age: ${osAgeMinutesRounded}m)"
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if ($osAge.TotalMinutes -gt $MaxOsAgeMinutes) {
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Write-Log "SKIP: OS was installed ${osAgeMinutesRounded}m ago (threshold: ${MaxOsAgeMinutes}m). Device is not freshly provisioned."
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exit 0
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}
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# Check 2: MDM enrollment must not be completed yet
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$enrollmentPath = "HKLM:\SOFTWARE\Microsoft\Enrollments"
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$mdmEnrolled = $false
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if (Test-Path $enrollmentPath) {
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$enrollmentEntries = Get-ChildItem -Path $enrollmentPath -ErrorAction SilentlyContinue |
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Where-Object { $_.PSChildName -match '^[0-9A-Fa-f\-]{36}$' }
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foreach ($entry in $enrollmentEntries) {
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$providerID = (Get-ItemProperty -Path $entry.PSPath -Name "ProviderID" -ErrorAction SilentlyContinue).ProviderID
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if ($providerID) {
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$mdmEnrolled = $true
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Write-Log "Found MDM enrollment: ProviderID=$providerID (EnrollmentID=$($entry.PSChildName))"
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break
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}
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}
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}
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if ($mdmEnrolled) {
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# Double-check: Is enrollment status tracking showing completed?
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$espPath = "HKLM:\SOFTWARE\Microsoft\Windows\Autopilot\EnrollmentStatusTracking\Device\Setup"
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$hasCompleted = (Get-ItemProperty -Path $espPath -Name "HasProvisioningCompleted" -ErrorAction SilentlyContinue).HasProvisioningCompleted
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if ($hasCompleted -eq 1) {
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Write-Log "SKIP: Autopilot enrollment already completed (HasProvisioningCompleted=1). Device is already enrolled."
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exit 0
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}
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}
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# Check 3: Is the agent already installed? (leftover from previous run)
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if (Test-Path $AgentBinPath) {
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$existingAgent = Get-ChildItem -Path $AgentBinPath -Filter "AutopilotMonitor.Agent.exe" -ErrorAction SilentlyContinue
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if ($existingAgent) {
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Write-Log "SKIP: Agent already installed at $($existingAgent.FullName). Previous enrollment may have been in progress. Please check if enrollment completed or clean up C:\ProgramData\AutopilotMonitor before re-running."
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exit 0
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}
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}
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Write-Log "Pre-flight checks passed - device is freshly provisioned and enrollment in progress"
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# Download and extract agent binaries
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$agentExePath = Join-Path $AgentBinPath "AutopilotMonitor.Agent.exe"
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if (Test-Path $agentExePath) {
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Write-Log "Agent already installed at $agentExePath"
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}
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else {
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Write-Log "Downloading agent from $AgentDownloadUrl..."
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try {
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# Derive version.json URL from the agent download URL (same blob container)
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$versionJsonUrl = $AgentDownloadUrl -replace '[^/]+$', 'version.json'
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$expectedSha256 = $null
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# Download version.json for SHA-256 integrity verification
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try {
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Write-Log "Fetching version.json from $versionJsonUrl for integrity verification..."
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$versionJsonResponse = Invoke-RestMethod -Uri $versionJsonUrl -UseBasicParsing -TimeoutSec 5 -ErrorAction Stop
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if ($versionJsonResponse.sha256) {
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$expectedSha256 = $versionJsonResponse.sha256.ToLowerInvariant()
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Write-Log "SHA-256 hash from version.json: $expectedSha256 (version: $($versionJsonResponse.version))"
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} else {
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Write-Log "version.json has no sha256 field — falling back to legacy MD5 check (older build)"
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}
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}
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catch {
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Write-Log "WARNING: Could not fetch version.json — falling back to legacy MD5 check: $($_.Exception.Message)"
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}
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# Download agent ZIP
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$zipPath = Join-Path $env:TEMP "AutopilotMonitor-Agent.zip"
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$maxDownloadAttempts = 3
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$downloadAttempt = 0
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$downloadResponse = $null
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do {
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$downloadAttempt++
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try {
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Write-Log "Download attempt ${downloadAttempt}/${maxDownloadAttempts}"
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$downloadResponse = Invoke-WebRequest `
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-Uri $AgentDownloadUrl `
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-OutFile $zipPath `
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-UseBasicParsing `
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-TimeoutSec 30 `
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-ErrorAction Stop `
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-PassThru
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Write-Log "Downloaded agent to $zipPath"
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break
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}
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catch {
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if ($downloadAttempt -ge $maxDownloadAttempts) {
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throw
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}
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$retryDelaysInSeconds = @(2, 4, 8)
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$retryDelaySeconds = $retryDelaysInSeconds[$downloadAttempt - 1]
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Write-Log "Download failed (attempt $downloadAttempt): $($_.Exception.Message). Retrying in ${retryDelaySeconds}s..."
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Start-Sleep -Seconds $retryDelaySeconds
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}
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} while ($downloadAttempt -lt $maxDownloadAttempts)
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# Integrity check: SHA-256 (preferred) or legacy Content-MD5 (fallback)
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if ($expectedSha256) {
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$actualSha256 = (Get-FileHash $zipPath -Algorithm SHA256).Hash.ToLowerInvariant()
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Write-Log "Validating SHA-256 hash against version.json"
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if ($actualSha256 -ne $expectedSha256) {
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throw "SHA-256 integrity check FAILED. Expected='$expectedSha256', Actual='$actualSha256'. Download may be tampered or corrupted."
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}
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Write-Log "SHA-256 integrity check passed"
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}
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else {
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# Legacy fallback: Content-MD5 header check
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$expectedMd5Header = $downloadResponse.Headers["Content-MD5"]
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$expectedMd5 = if ($expectedMd5Header -is [System.Array]) { "$($expectedMd5Header[0])".Trim() } else { "$expectedMd5Header".Trim() }
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if ($expectedMd5 -notmatch '\S') {
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Write-Log "WARNING: No SHA-256 and no Content-MD5 header — skipping integrity validation"
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}
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else {
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$actualMd5 = Get-FileMd5Base64 -Path $zipPath
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Write-Log "Validating Content-MD5 header against downloaded ZIP"
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if ($actualMd5 -ne $expectedMd5) {
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throw "MD5 integrity check failed. Expected (Content-MD5)='$expectedMd5', Actual='$actualMd5'"
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}
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Write-Log "MD5 integrity check passed"
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}
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}
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# Extract to agent bin path
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Expand-Archive -Path $zipPath -DestinationPath $AgentBinPath -Force
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Write-Log "Extracted agent to $AgentBinPath"
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# Cleanup
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Remove-Item $zipPath -Force -ErrorAction SilentlyContinue
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Write-Log "Cleaned up temporary files"
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# Verify extraction
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if (-not (Test-Path $agentExePath)) {
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throw "Agent executable not found after extraction at $agentExePath"
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}
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Write-Log "Agent installation completed successfully"
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}
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catch {
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Write-Log "ERROR downloading/extracting agent: $($_.Exception.Message)"
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throw
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}
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}
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# Let the agent install/deploy itself and manage its own Scheduled Task
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Write-Log "Calling agent install mode (--install)..."
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& $agentExePath --install
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$installExitCode = $LASTEXITCODE
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if ($installExitCode -ne 0) {
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throw "Agent install failed with exit code $installExitCode"
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}
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Write-Log "Agent install mode completed successfully"
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Write-Log "===== Bootstrap Completed Successfully ====="
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Write-Log "Agent Path: $AgentBasePath"
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Write-Log "Scheduled Task: managed by agent (--install)"
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Write-Log "Agent will monitor enrollment and auto-remove when complete"
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Write-Log "Bootstrap log: $LogFile"
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Write-Log ""
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Write-Log "IMPORTANT: Agent runs as Scheduled Task and will:"
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Write-Log " - Generate unique session ID on startup"
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Write-Log " - Survive reboots during enrollment"
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Write-Log " - Monitor enrollment phases in real-time"
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Write-Log " - Upload events to built-in backend URL (or CLI override /--backend-api)"
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Write-Log " - Self-destruct when enrollment completes"
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Write-Log " - Clean removal: delete C:\ProgramData\AutopilotMonitor folder"
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exit 0
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}
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catch {
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Write-Log "===== Bootstrap FAILED ====="
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Write-Log "ERROR: $($_.Exception.Message)"
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Write-Log "Stack trace: $($_.ScriptStackTrace)"
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Write-Log "Please check log file: $LogFile"
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exit 1
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}
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