AutopilotMonitor/docs/architecture.md

Autopilot Monitor – Architecture Guide

Living document describing the system architecture, design decisions, and conventions.

---

High-Level Overview

+----------------------------------------------------------------------------------+
|                         Autopilot Monitor - Architecture                         |
+----------------------------------------------------------------------------------+

 [Admin/User Browser]
          |
          | HTTPS
          v
+-----------------------------+      OIDC        +-------------------------------+
| Web App (Next.js)           |<---------------->| Microsoft Identity (Entra ID) |
| Dashboard / Progress / Docs |                  | Auth / Authorization          |
+-----------------------------+                  +-------------------------------+
          ^    ^
          |    |
          |    | Live updates
          |    |
          |    |                         +---------------------------+
          |    +-------------------------| SignalR Hub               |
          |                              | Real-time event stream    |
          |                              +---------------------------+
          |                                          ^
          | REST / API                               |
          v                                          | events
+---------------------------+        Data &          |
| Azure Functions Backend   |------> Integrations ---+
| APIs / Ingestion / Rules  |               \
+---------------------------+                \       +---------------------------+
          ^                                   +----->| Storage Tables            |
          | mTLS                                     | Sessions / Events / Rules |
          | telemetry / events                       +---------------------------+
          |                                          +---------------------------+
+---------------------------+                        | Notifications             |
| Agent on Windows Devices  |                        | Teams / Slack / Telegram  |
| Enrollment + app progress |                        +---------------------------+
+---------------------------+
                                                     +---------------------------+
                                                     | MCP Server                |
                                                     | Azure Container App       |
                                                     +---------------------------+

Core Data Flow:

Device (Agent) ──NDJSON+gzip──► Azure Functions ──► Azure Table Storage
                                      │                     │
                                      ├── SignalR ─────────►│
                                      │                     │
                              Web Dashboard ◄── REST API ◄──┘

Component	Technology	Purpose
Agent	.NET Framework 4.8 (Windows)	Runs on devices during enrollment, collects telemetry
SummaryDialog	.NET Framework 4.8 (WPF)	Post-enrollment summary UI (outcome, app timeline, auto-close)
Backend	Azure Functions .NET 8 (Isolated Worker)	REST API, event processing, rule engine, storage
Web	Next.js 15 + TypeScript + React 18	Dashboard, settings, analytics, real-time UI
Shared	.NET Standard 2.0	DTOs, models, enums, constants shared between Agent & Backend
MCP Server	Azure Container App	Model Context Protocol server for AI-assisted analysis

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Table of Contents

1. Solution Structure
2. Agent
3. Backend
4. Web Frontend
5. Shared Library
6. Data Model
7. Security Architecture
8. Real-Time Communication
9. Rules Engine
10. Session Lifecycle
11. Configuration Hierarchy
12. Diagnostics & Upload
13. Vulnerability Management
14. Notification System
15. Testing
16. Infrastructure & Deployment
17. Build & Development

---

Solution Structure

AutopilotMonitor.sln
├── src/
│   ├── Shared/AutopilotMonitor.Shared/          (netstandard2.0)
│   ├── Agent/
│   │   ├── AutopilotMonitor.Agent/              (net48, Exe – entry point)
│   │   ├── AutopilotMonitor.Agent.Core/         (net48, Lib – core logic)
│   │   ├── AutopilotMonitor.Agent.Core.Tests/   (net48, xUnit – agent unit tests)
│   │   └── AutopilotMonitor.SummaryDialog/      (net48, WPF – enrollment summary UI)
│   ├── Backend/
│   │   ├── AutopilotMonitor.Functions/          (net8.0, Azure Functions v4)
│   │   └── AutopilotMonitor.Functions.Tests/    (net8.0, xUnit)
│   └── Web/
│       └── autopilot-monitor-web/               (Next.js 15, TypeScript)
├── rules/
│   ├── gather/                                   Individual gather rule JSONs
│   ├── analyze/                                  Individual analyze rule JSONs
│   ├── ime-log-patterns/                         IME regex pattern JSONs
│   ├── schema/                                   JSON Schema definitions
│   ├── scripts/                                  combine.js
│   └── dist/                                     Combined output (embedded in Functions)
├── infra/                                        Bicep templates (MCP server)
├── scripts/
│   ├── Bootstrap/                                Intune deployment scripts
│   └── Deployment/                               CI/CD build scripts
└── .github/workflows/                            CI/CD pipelines

Project References:

Shared ◄── Agent.Core ◄── Agent
                         ◄── Agent.Core.Tests
                         ◄── SummaryDialog
Shared ◄── Functions ◄── Functions.Tests
Web (independent – communicates via REST + SignalR)

---

Agent

Entry Point & Modes

File: src/Agent/AutopilotMonitor.Agent/Program.cs

Four execution modes:

1. Normal mode (default) – Main enrollment monitoring loop
2. --install mode – Deploys agent via Scheduled Task (Intune package)
3. --run-gather-rules mode – One-shot offline data collection, then exits
4. --run-ime-matching mode – Offline IME log parsing, writes ime_pattern_matching.log

Partial class files: Program.Configuration.cs, Program.InstallMode.cs, Program.GatherRulesMode.cs, Program.ImeMatchingMode.cs

Startup Sequence (Normal Mode)

1. Single-instance check (prevent duplicate agent processes)
2. Self-update: SelfUpdater.CheckAndApplyUpdateAsync() (downloads from Azure Blob)
3. Load configuration
4. Check enrollment-complete marker (handles post-reboot cleanup retry)
5. Check session age emergency break (zombie agent kill-switch)
6. Detect previous exit type: clean / exception_crash / hard_kill / reboot_kill / first_run
7. FetchRemoteConfig() – Backend config with 15s timeout, disk cache fallback
8. VerifyAgentBinaryIntegrity() – Computes SHA-256 of running EXE, compares against backend LatestAgentSha256, sends emergency signal on mismatch
9. CheckConfigMgrClient() – Detects co-management (registry/service/directory probes), emits configmgr_client_detected
10. RegisterSessionAsync() – Register session (5 retries, exponential backoff)
11. StartWatching() – Enable FileSystemWatcher for event spool
12. StartEventCollectors() – EspAndHelloTracker (always on)
13. StartOptionalCollectors() – PerformanceCollector, AgentSelfMetrics, EnrollmentTracker, DesktopArrivalDetector, DeliveryOptimizationCollector
14. StartGatherRuleExecutor() – Backend-defined data collection rules
15. InitializeAnalyzers() + RunStartupAnalyzers() – Security baseline

Key Services

Service	Location	Responsibility
MonitoringService	Core/Monitoring/Core/	Main orchestrator: starts/stops collectors, manages upload loop (3 partial files)
BackendApiClient	Core/Monitoring/Network/	HTTP client with mTLS cert + hardware headers + bootstrap token
EventSpool	Core/Monitoring/Core/	Offline event storage (JSON files), FileSystemWatcher-based
EnrollmentTracker	Core/Monitoring/Tracking/	Central enrollment state machine, 3 completion paths (4 partial files)
ImeLogTracker	Core/Monitoring/Tracking/	Parses IME logs with backend-provided regex patterns (3 partial files)
EspAndHelloTracker	Core/Monitoring/Collectors/	ESP state + Hello provisioning monitoring + ESP provisioning status tracking (5 partial files)
DesktopArrivalDetector	Core/Monitoring/Collectors/	Polls for explorer.exe under real user (non-SYSTEM, non-DefaultUser*)
DeliveryOptimizationCollector	Core/Monitoring/Collectors/	Polls OS-level DO status via persistent PowerShell Runspace, matches to IME app downloads, emits download_progress + do_telemetry events
NetworkChangeDetector	Core/Monitoring/Collectors/	Detects network connectivity changes
ImeProcessWatcher	Core/Monitoring/Collectors/	Monitors IntuneManagementExtension process lifecycle
PerformanceCollector	Core/Monitoring/Collectors/	CPU/Memory/Disk/Network metrics
AgentSelfMetricsCollector	Core/Monitoring/Collectors/	Agent process self-telemetry
GatherRuleExecutor	Core/Monitoring/Collectors/	Executes backend-defined data collection rules
DeviceInfoCollector	Core/Monitoring/Collectors/	Hardware spec + network/security info (3 partial files)
DiagnosticsPackageService	Core/Monitoring/Core/	Creates ZIP + uploads via short-lived SAS URL
RemoteConfigService	Core/Configuration/	Fetches & caches backend config with disk fallback
SessionPersistence	Core/Monitoring/Core/	Persists session ID, sequence counter, WhiteGlove state
DistressReporter	Core/Monitoring/Network/	Pre-auth distress signals (no cert required)
EmergencyReporter	Core/Monitoring/Network/	Posts AgentErrorReport via BackendApiClient
GeoLocationService	Core/Monitoring/Network/	IP-based device location lookup
NtpTimeCheckService	Core/Monitoring/Network/	UDP NTP query to detect clock skew
TimezoneService	Core/Monitoring/Network/	Sets Windows timezone via tzutil /s

Analyzers

Analyzer	Purpose
LocalAdminAnalyzer	Enumerates local admin accounts at start+shutdown, flags unexpected accounts
SoftwareInventoryAnalyzer	Captures installed software from registry at start+shutdown, emits software_inventory_analysis events

Gather Rule Collectors

Each implements IGatherRuleCollector:

Collector	Purpose
RegistryCollector	Read registry values
WmiCollector	WMI queries
EventLogCollector	Windows Event Log queries
FileCollector	Collect file contents
CommandCollector	Run allowlisted commands
LogParserCollector	Parse log files
JsonCollector	Collect JSON from file/registry
XmlCollector	Parse XML files

Security enforced by GatherRuleGuards (allowed targets) and DiagnosticsPathGuards (path validation, respects UnrestrictedMode).

Directory Layout (Agent.Core)

Configuration/       Config loading, remote config service
Logging/             AgentLogger (file + optional console)
Monitoring/
├── Analyzers/       Security checks (LocalAdminAnalyzer, SoftwareInventoryAnalyzer)
├── Collectors/      Data collectors (ESP, Hello, Performance, GatherRules, Diagnostics, Desktop)
│   └── GatherCollectors/  Per-type gather rule collectors
├── Core/            Orchestration (MonitoringService, EventSpool, SessionPersistence, CleanupService)
├── Interop/         P/Invoke declarations (process creation, registry change notifications)
├── Network/         API client, distress/emergency reporters, geo-location, NTP, network metrics
├── Replay/          Log replay for testing/simulation
└── Tracking/        Enrollment state machine, IME parser, script/app tracking, state persistence
Security/            Certificate helper, enrollment awaiter, hardware info

Event Collection & Upload

1. Collector emits EnrollmentEvent → sequence number auto-assigned (thread-safe Interlocked)
2. Event saved to spool as JSON file: event_{timestamp}_{sequence}.json
3. FileSystemWatcher triggers debounce timer (configurable UploadIntervalSeconds, default 30s)
4. Batch upload: NDJSON + gzip compression, max 100 events per batch
5. Response handling: DeviceKillSignal → self-destruct; DeviceBlocked → stop uploads

Idle Timeout & Lifetime

• Collector Idle Timeout: Default 15min (CollectorIdleTimeoutMinutes). Tracks _lastRealEventTime. "Real" events = everything except performance_snapshot, agent_metrics_snapshot, and *_stopped variants. Idle collectors auto-restart on new activity.
• Agent Max Lifetime: Default 360min/6h (AgentMaxLifetimeMinutes). Emits enrollment_failed with failureType="agent_timeout".
• Session Age Emergency Break: 48h absolute max. Checked at startup, triggers cleanup.

Agent Data Paths

%ProgramData%\AutopilotMonitor\
├── session.id, session.seq, session.created
├── whiteglove.complete
├── bootstrap-config.json
├── Logs/agent.log
├── Spool/event_*.json
├── Config/remote-config.json
└── State/
    ├── enrollment-state.json
    ├── ime-tracker-state.json
    ├── enrollment-complete.marker
    └── self-update-info.json

---

Backend

Azure Functions Setup

• Runtime: .NET 8 Isolated Worker, Azure Functions v4
• Route Prefix: /api
• Monitoring: Application Insights with sampling
• Entry Point: src/Backend/AutopilotMonitor.Functions/Program.cs

Middleware Pipeline

Registered in this order:

1. RequestTelemetryMiddleware – Wraps all requests for Application Insights telemetry
2. CorrelationIdMiddleware – Propagates or generates X-Correlation-Id
3. AuthenticationMiddleware – Validates JWT Bearer tokens via Azure AD OIDC metadata; caches per-tenant config managers (max 100); tracks MCP usage via X-Client-Source: mcp header
4. PolicyEnforcementMiddleware – Catalog-driven authorization (fail-closed: unregistered routes get 403); sets RequestContext (IsGlobalAdmin, IsTenantAdmin, UserRole)
5. UserRateLimitMiddleware – Per-user API rate limiting for human users

Endpoints (~140 Functions)

Agent-to-Cloud (device auth via cert/bootstrap):

Route	Method	Purpose
/agent/register-session	POST	Register new enrollment session
/agent/ingest	POST	Upload events (NDJSON+gzip)
/agent/config	GET	Fetch agent configuration
/agent/upload-url	POST	Get short-lived SAS URL for diagnostics
/agent/error	POST	Report agent errors
/agent/distress	POST	Pre-auth distress signal (no cert required)

Bootstrap (pre-MDM auth):

Route	Method	Purpose
/bootstrap/sessions	POST/GET	Create/list bootstrap sessions
/bootstrap/sessions/{code}	DELETE	Revoke bootstrap session
/bootstrap/validate/{code}	GET	Validate bootstrap code (public)
/bootstrap/register-session	POST	Register via bootstrap token
/bootstrap/ingest	POST	Ingest via bootstrap token
/bootstrap/config	POST	Config via bootstrap token
/bootstrap/error	POST	Error report via bootstrap token

Web Portal (JWT auth):

Category	Key Routes
Sessions	GET /sessions, GET /sessions/{id}, GET /sessions/{id}/events, DELETE /sessions/{id}, POST /sessions/{id}/mark-failed, POST /sessions/{id}/mark-succeeded
Search	GET /search/quick, GET /search/sessions, GET /search/sessions-by-event, GET /search/sessions-by-cve
Rules	CRUD for /rules/gather, /rules/analyze, /rules/ime-log-patterns, POST /rules/reseed-from-github, GET /rules/results
Config	GET/PUT /global/config, GET/PUT /config/{tenantId}, GET /config/all, GET /global/config/plan-tiers
Auth	GET /auth/me
Tenants	CRUD /tenants/{id}/admins, POST /tenants/{id}/offboard
Devices	POST /devices/block, DELETE /devices/block/{serial}, GET /devices/blocked, GET /global/devices/blocked
Versions	POST /versions/block, GET /versions/blocked, DELETE /versions/block/{pattern}
Reports	POST /sessions/{id}/report, GET/POST /global/session-reports, distress reports
Metrics	GET /metrics/usage, GET /metrics/app, GET /metrics/summary, GET /metrics/geographic, GET /metrics/geographic/sessions, GET /stats/platform
Global	/global/metrics/*, /global/audit/logs, /global/session-reports, /global/notifications (CRUD + dismiss), /global/mcp-users, /global/ops-events
Audit	GET /audit/hardware-rejected — hardware whitelist rejection aggregation (manufacturer+model grouping, attempt counts, unique serials)
Vulnerability	GET /sessions/{id}/vulnerability-report, CPE mapping CRUD, POST /vulnerability/sync, software inventory
Progress	GET /progress/sessions
Diagnostics	GET /diagnostics/download-url
SignalR	POST /realtime/negotiate, POST /realtime/groups/join, POST /realtime/groups/leave
Health	GET /health, GET /health/detailed
Feedback	POST /feedback
MCP	GET/POST/DELETE /global/mcp-users, MCP usage metrics
Raw/Debug	AppInsights query proxy, raw events/sessions query, table query
Autopilot Validation	Consent URL + status for Graph API access

Timer Triggers:

• MaintenanceFunction – Every 2 hours (0 0 */2 * * *): stale session detection, metrics aggregation, data cleanup
• VulnerabilityDataSyncFunction – Periodic CVE data sync from NVD/MSRC/CISA KEV

Key Backend Services

Service	Responsibility
TableStorageService	Core data access for all 34 Azure Tables (split across 5 partial files)
TenantConfigurationService	Per-tenant config with 5-min cache
AdminConfigurationService	Global config with 5-min cache, syncs rate limits to tenants
RateLimitService	In-memory sliding window rate limiting (1-min window)
DistressRateLimitService	Rate limiter for the unauthenticated distress endpoint
SecurityValidator	Centralized request validation (cert → rate limit → hardware → APV)
RuleEngine	Server-side analyze rule evaluation with confidence scoring
MaintenanceService	Cleanup, metrics aggregation, stale session detection (+ Aggregation partial)
BootstrapSessionService	Bootstrap token lifecycle (create, validate, revoke)
BlockedDeviceService	Device block/kill signal management
BlockedVersionService	Version-based block/kill rules with wildcard and ceiling patterns
SessionReportService	Report ZIP generation + Blob upload
BlobStorageService	Azure Blob Storage (diagnostics upload SAS URLs)
GraphTokenService	MS Graph token acquisition for Autopilot device validation
AutopilotDeviceValidator	Validates serial against Intune Autopilot device list
CorporateIdentifierValidator	Validates against Intune Corporate Device Identifiers
GlobalNotificationService	Persistent in-app notifications for Global Admins
OpsAlertDispatchService	Evaluates ops alert rules and dispatches notifications for infrastructure events
HealthCheckService	Health checks for Storage, Processing, and Agent binary availability
PreviewWhitelistService	Private Preview tenant whitelist with 5-min cache
McpUserService	MCP API user management + access control
TenantAdminsService	Tenant member/admin management (roles: Admin, Operator, Viewer)
GlobalAdminService	Global admin lookup
UsageMetricsService	Daily/rolling usage metrics
PlatformMetricsService	Platform-wide stats
VulnerabilityCorrelationService	Matches installed software against CVE data
WebhookNotificationService	Dispatches enrollment notifications via webhook (Teams/Slack)
TelegramNotificationService	Telegram bot notifications
ResendEmailService	Transactional emails via Resend API
SignalRNotificationService	Pushes real-time updates to connected web clients
EventTimestampValidator	Clamps/validates event timestamps (preserves originals)
GitHubRuleRepository	Fetches rules from GitHub for reseed

Data Access Layer

Repository pattern via interfaces in AutopilotMonitor.Shared/DataAccess/:

Repository	Purpose
TableSessionRepository	Sessions + events + indexes
TableConfigRepository	Tenant/admin configuration
TableRuleRepository	Gather/analyze rules, IME patterns, rule results
TableMetricsRepository	Usage metrics, app install summaries, platform stats
TableAdminRepository	Audit logs, global/tenant admins, MCP users
TableBootstrapRepository	Bootstrap sessions
TableDeviceSecurityRepository	Blocked devices, blocked versions
TableDistressReportRepository	Distress reports
TableOpsEventRepository	Operational infrastructure events (consent, maintenance, security, tenant, agent)
TableMaintenanceRepository	Maintenance operations
TableNotificationRepository	Global notifications
TableUserUsageRepository	Per-user API usage tracking
TableVulnerabilityRepository	CVE data, CPE mappings, software inventory

Event Processing Pipeline

Agent POST /api/agent/ingest (NDJSON+gzip)
    │
    ├─ SecurityValidator.ValidateRequestAsync()
    │   ├─ Tenant existence & suspension
    │   ├─ Bootstrap token gate (if present)
    │   ├─ Certificate validation against Intune CAs
    │   ├─ Rate limiting (sliding window)
    │   ├─ Hardware whitelist
    │   └─ Autopilot device validation (optional)
    │
    ├─ BlockedDeviceService.IsBlockedAsync() → kill/block signal
    │
    ├─ ParseNdjsonGzipRequest() → decompress + parse events
    │
    ├─ StampServerFields() → ReceivedAt, TenantId, SessionId
    │
    ├─ EventTimestampValidator → clamp/validate timestamps
    │
    ├─ TableStorageService.StoreEventsBatchAsync()
    │
    ├─ ClassifyEvents()
    │   ├─ Extract geo-location
    │   ├─ Track app installs → AppInstallSummaries table
    │   └─ Detect enrollment completion/failure
    │
    ├─ UpdateSessionStatusAsync() → merge session row
    │
    ├─ RuleEngine.AnalyzeSessionAsync() (on enrollment end)
    │   └─ StoreRuleResultAsync() → RuleResults table
    │
    ├─ VulnerabilityCorrelation (on software inventory events)
    │
    ├─ WebhookNotificationService (Teams/Slack on enrollment complete/fail)
    │
    └─ SignalR broadcasts:
        ├─ "eventReceived" → tenant-{tenantId}
        ├─ "sessionStatusChanged" → tenant-{tenantId}
        └─ "ruleResultReceived" → tenant-{tenantId}

---

Web Frontend

Technology Stack

• Framework: Next.js 15.1.6 (App Router)
• Language: TypeScript 5.7.3
• UI: React 18.2.0 + Tailwind CSS 3.4.17 (dark mode via class strategy)
• Auth: MSAL.js 3.28 (@azure/msal-browser + @azure/msal-react)
• Real-time: @microsoft/signalr 10.0.0
• Maps: Leaflet 1.9.4 + react-leaflet
• Compression: fflate 0.8.2
• Telemetry: Application Insights Web 3.3.11

Page Routes

Path	Purpose	Auth	Role
/	Landing page with platform stats	Public	—
/dashboard	Session list, real-time updates	Yes	Any
/sessions/[sessionId]	Session detail, event timeline, analysis, vulnerability report	Yes	Any
/diagnosis/[sessionId]	Simplified diagnosis with badges	Yes	Any
/fleet-health	App metrics, fleet analytics	Yes	Member
/geographic-performance	Geo map + session drill-down	Yes	Member
/analyze-rules	Analyze rule CRUD	Yes	Tenant Admin
/gather-rules	Gather rule CRUD	Yes	Tenant Admin
/ime-log-patterns	IME pattern management	Yes	Tenant Admin
/audit	Audit log viewer	Yes	Member
/usage-metrics	Tenant usage analytics	Yes	Member
Settings
/settings/tenant/[section]	Access management, Autopilot validation, bootstrap, hardware whitelist, notifications	Yes	Tenant Admin
/settings/agent/[section]	Agent analyzers, agent settings, diagnostics, unrestricted mode	Yes	Tenant Admin
/settings/management/[section]	Data management, offboarding	Yes	Tenant Admin
/settings/reporting/[section]	MCP usage	Yes	Tenant Admin
Admin (Global)
/admin/metrics/[section]	Agent metrics, MCP usage, platform usage	Yes	Global Admin
/admin/reports/[section]	Distress reports, session export, session reports, user feedback	Yes	Global Admin
/admin/security/[section]	Device block, version block, vulnerability data	Yes	Global Admin
/admin/settings/[section]	Config reseed, diagnostics log paths, global settings, MCP users, usage plans	Yes	Global Admin
/admin/tenants/[section]	Tenant config report, tenant management	Yes	Global Admin
/admin/ops	Operations page	Yes	Global Admin
/admin/software	Software inventory	Yes	Global Admin
Public
/progress	Real-time enrollment progress (end users)	Public	—
/docs/[section]	Documentation (12 sections)	Public	—
/changelog	Platform change log & known issues	Public	—
/roadmap	Planned features & current focus areas	Public	—
/about	Platform introduction & quick links	Public	—
/privacy	Privacy policy & data handling	Public	—
/terms	Terms of use & legal disclaimers	Public	—
/preview	Private Preview waitlist/approval	Yes	Unapproved
/health-check	Backend health status	Public	—
/go/[code]	Bootstrap short-link redirector	Public	—

State Management

React Context API (no Redux/Zustand):

Context	Purpose
AuthContext	MSAL + user info + role detection (global/tenant admin, operator, viewer, MCP access, bootstrap manager)
SignalRContext	WebSocket connection, group subscriptions, auto-reconnect
TenantContext	Current tenant ID (persisted to localStorage)
NotificationContext	Toast notifications with auto-dismiss + deduplication
GlobalNotificationContext	In-app persistent notifications for Global Admins
SidebarContext	Sidebar expanded/collapsed state
ThemeContext	Dark mode toggle (localStorage)

API Communication

• lib/authenticatedFetch.ts – Wraps fetch() with Bearer token, 401 retry with token refresh
• lib/api.ts – Typed URL builder for all backend endpoints
• hooks/useAuthenticatedFetch.ts – React hook with loading/error state
• Tenant isolation: All endpoints append ?tenantId={id}

Key UI Components

Component	Location	Purpose
GlobalSidebar	components/	Main navigation sidebar
Navbar	components/	Top navigation bar
GlobalSearch	components/	Cross-session search overlay
ProtectedRoute	components/	Auth guard with role-based access
FeedbackBubble	components/	In-app feedback button
SessionTable	dashboard/components/	Paginated, filterable, sortable session list
EventTimeline	sessions/[id]/components/	Phase-grouped event visualization
PhaseTimeline	sessions/[id]/components/	Visual phase progress with live activity
VulnerabilityReportSection	sessions/[id]/components/	CVE findings display
AnalysisResultsSection	sessions/[id]/components/	Analyze rule results
ScriptExecutions	components/	Script output viewer
PerformanceChart	components/	Time-series metrics chart
ValidationIndicator	components/	Device validation status
AppInsightsInit	components/	Azure Application Insights initialization

UI Patterns

• Settings pages use error (string|null) + successMessage (string|null) state for notifications
• Notifications rendered at top of <main> content area
• "use client" directive on interactive components
• Expand/collapse sections with guard blocks
• UnsavedChangesModal prevents navigation with unsaved form state

---

Shared Library

Target: .NET Standard 2.0 (compatible with both net48 Agent and net8.0 Backend)

Model Categories

Namespace	Key Classes	Purpose
Models/Enrollment/	EnrollmentEvent, SessionRegistration, EnrollmentPhase, EventSeverity, BootstrapSession	Core enrollment data
Models/Config/	AgentConfigResponse, CollectorConfiguration, AnalyzerConfiguration, TenantConfiguration, AdminConfiguration, McpAccessPolicy, PlanTierDefinition	Configuration hierarchy
Models/Rules/	GatherRule, AnalyzeRule, ImeLogPattern, RuleResult	Rules engine
Models/Metrics/	UsageMetrics, UsageMetricsSnapshot, PlatformStats, AppInstallSummary	Analytics
Models/Diagnostics/	DiagnosticsLogPath, AgentErrorReport, DistressReport	Diagnostics & error reporting
Models/Notifications/	NotificationAlert, NotificationSeverity, WebhookProviderType	Notification system
DataAccess/	13 repository interfaces (ISessionRepository, IConfigRepository, etc.)	Data access contracts
ApiModels.cs	Request/Response pairs for all endpoints	API contracts
Constants.cs	Table names (33), API endpoints, event types (50+), defaults	Shared constants

Key Enums

• EnrollmentPhase: Unknown(-1), Start(0), DevicePreparation(1), DeviceSetup(2), AppsDevice(3), AccountSetup(4), AppsUser(5), FinalizingSetup(6), Complete(7), Failed(99)
• EventSeverity: Trace(-1), Debug(0), Info(1), Warning(2), Error(3), Critical(4)
• WebhookProviderType: None(0), TeamsLegacyConnector(1), TeamsWorkflowWebhook(2), Slack(10)
• 50+ Event Types: phase_transition, app_install_completed, enrollment_complete, enrollment_failed, esp_state_change, performance_snapshot, script_completed, gather_result, software_inventory_analysis, download_progress, do_telemetry, configmgr_client_detected, esp_provisioning_status, etc.

---

Data Model

Azure Table Storage (34 Tables)

Table	PartitionKey	RowKey	Purpose
Sessions	TenantId	SessionId	Enrollment sessions
SessionsIndex	TenantId	IndexKey	Session search indexes
Events	SessionId	Timestamp_Sequence	Individual events
EventTypeIndex	TenantId	EventType_Timestamp	Event type search index
AdminConfiguration	"GlobalConfig"	"config"	Platform-wide settings
TenantConfiguration	TenantId	"config"	Per-tenant settings
GatherRules	TenantId	RuleId	Data collection rules
AnalyzeRules	TenantId	RuleId	Issue detection rules
ImeLogPatterns	TenantId	PatternId	IME log regex patterns
RuleResults	TenantId	SessionId_RuleId	Analysis findings
RuleStates	TenantId	RuleId	Rule enable/disable state
UsageMetrics	TenantId	MetricDate	Daily usage snapshots
AppInstallSummaries	TenantId	SessionId_AppName	Per-app install data
PlatformStats	"Global"	"stats"	Cumulative platform stats
AuditLogs	TenantId	Timestamp_Id	Admin action audit trail
UserActivity	TenantId	UserId	User login tracking
UserUsageLog	TenantId	UserId_Timestamp	Per-user API usage tracking
BootstrapSessions	TenantId / "CodeLookup"	ShortCode	OOBE bootstrap tokens
BlockedDevices	TenantId	SerialNumber	Blocked devices
BlockedVersions	"BlockedVersions"	Pattern	Version block/kill rules
SessionReports	TenantId	ReportId	User-submitted reports
DistressReports	TenantId	Timestamp_Id	Pre-auth distress signals
GlobalAdmins	"GlobalAdmins"	UPN	Platform-level admins
TenantAdmins	TenantId	UPN	Tenant-level admins (Admin, Operator, Viewer)
McpUsers	"McpUsers"	UPN	MCP API users
PreviewWhitelist	"Preview"	TenantId	Preview access gate
PreviewConfig	"Preview"	"config"	Preview feature config
GlobalNotifications	"GlobalNotifications"	InvertedTicks_Id	Persistent in-app notifications for Global Admins
DeviceSnapshot	TenantId	DeviceSerial	Device hardware/network snapshots
VulnerabilityCache	CacheType	CacheKey	Cached NVD/MSRC/KEV CVE data
VulnerabilityReports	TenantId	SessionId	Per-session vulnerability findings
SoftwareInventory	TenantId	SoftwareName	Aggregated software inventory
CveIndex	CveId	TenantId_SessionId	CVE → session cross-reference
OpsEvents	Category	InvertedTicks	Operational infrastructure events (consent, maintenance, security, tenant, agent)

Azure Blob Storage

• Diagnostics container: Agent-uploaded ZIP packages (AgentDiagnostics-{sessionId}-{ts}.zip)
• Session reports container: User-submitted report ZIPs
• Platform stats blob: Cached JSON for landing page

Entity Relationships

Session (1) ──► (N) EnrollmentEvent
Session (1) ──► (N) RuleResult
Session (1) ──► (N) AppInstallSummary
Session (1) ──► (0..1) SessionReport
Session (1) ──► (0..1) VulnerabilityReport
Session (N) ◄── (1) TenantConfiguration
TenantConfiguration (N) ◄── (1) AdminConfiguration (inherits defaults)
GatherRule ──► (agent executes) ──► EnrollmentEvent (gather_result)
AnalyzeRule ──► (backend evaluates) ──► RuleResult
ImeLogPattern ──► (agent matches) ──► EnrollmentEvent (various types)
SoftwareInventory ──► VulnerabilityCorrelation ──► VulnerabilityReport

---

Security Architecture

Authentication Layers

Agent → Backend (device auth):

1. MDM Client Certificate (primary)

   • Agent discovers Intune MDM cert in LocalMachine\My store
   • Sent via TLS (mTLS), forwarded as X-ARR-ClientCert by Azure App Service
   • Validated against embedded Intune intermediate + root CA certificates

2. Bootstrap Token (pre-MDM, OOBE)

   • Admin creates time-limited token+code via web UI
   • Agent sends as X-Bootstrap-Token header
   • Bypasses cert/rate/hardware validation

3. Hardware Headers (supplementary)

   • X-Device-SerialNumber, X-Device-Manufacturer, X-Device-Model
   • Used for whitelist validation and device identification

4. Agent Version Header

   • X-Agent-Version – used for version block enforcement

Web → Backend (user auth):

• Microsoft Entra ID multi-tenant JWT via AuthenticationMiddleware
• Dynamic OIDC metadata per tenant (cached 24h)
• Claims: tid (tenant), upn (user), oid (object ID)

MCP → Backend:

• JWT auth + X-Client-Source: mcp header for usage tracking
• Access controlled via McpUserService

Validation Pipeline (per agent request)

ValidateSecurityAsync()  (SecurityValidationExtensions.cs)
├─ 1. Tenant existence & suspension check (cheapest first)
├─ 2. Bootstrap token gate (if present → short-circuit)
├─ 3. Certificate validation against Intune CA chain
├─ 4. Rate limiting (sliding window, 1-min, per-device)
├─ 5. Hardware whitelist check (optional per tenant)
└─ 6. Autopilot device validation via MS Graph (optional per tenant)

Agent Binary Integrity Verification

Agent downloads are verified using SHA-256 hashes through two independent channels:

Channel 1: version.json (Blob Storage)

• CI/CD computes SHA-256 of the agent ZIP after build
• Hash is written to version.json: { "version": "1.0.x", "sha256": "..." }
• Bootstrapper and Self-Updater verify the downloaded ZIP against this hash

Channel 2: Backend Hash-Oracle (AdminConfiguration)

• CI/CD writes the SHA-256 hash to AdminConfiguration.LatestAgentSha256 in Table Storage
• Backend delivers the hash via AgentConfigResponse.LatestAgentSha256
• Self-Updater uses the backend hash with priority over the version.json hash
• Separate trust channel: an attacker would need to compromise both Blob Storage AND the backend

Verification flow:

Self-Updater:
  1. Fetch version.json → get sha256 field
  2. Download ZIP
  3. Verify SHA-256: backend hash (priority) > version.json hash > skip (backward compat)

Bootstrapper:
  1. Fetch version.json → get sha256 field
  2. Download ZIP
  3. Verify SHA-256: version.json hash > legacy Content-MD5 header > skip (backward compat)

Channel 3: Post-Config EXE Integrity Check (Runtime)

• After config fetch, agent computes SHA-256 of the running EXE (Process.GetCurrentProcess().MainModule)
• Compares against LatestAgentSha256 from backend config (case-insensitive)
• On mismatch: sends emergency signal with AgentErrorType.IntegrityCheckFailed
• Closes trust gap: ZIP hash verifies download integrity, EXE hash verifies running binary wasn't tampered post-extraction
• Gracefully handles missing hash (skips) and file access errors (warns, continues)

Authorization Model

Endpoint Access Policies (EndpointAccessPolicyCatalog)

Six policy tiers (fail-closed: unregistered routes get 403). Each entry also specifies a TenantScoping mode (see Tenant Data Isolation):

Policy	Description
PublicAnonymous	No auth required
DeviceOrBootstrapAuth	mTLS cert or bootstrap token (via ValidateSecurityAsync)
AuthenticatedUser	Valid JWT, any tenant
MemberRead	Admin + Operator + Viewer roles
TenantAdminOrGA	Tenant Admin or Global Admin
BootstrapManagerOrGA	Bootstrap Manager permission or Global Admin
GlobalAdminOnly	Platform-wide admin

Roles

Role	Scope	Capabilities
Global Admin	Platform-wide	Global config, all tenants, platform metrics, health checks, MCP users
Tenant Admin	Single tenant	Tenant config, rules, admin management, device blocking, notifications
Operator	Single tenant	Write access, optionally Bootstrap Manager permission
Viewer	Single tenant	Read-only dashboard, session detail view

Tenant Data Isolation (Centralized Enforcement)

Tenant isolation is enforced centrally in the middleware pipeline via TenantScoping on every catalog entry:

Scoping Mode	Source	Middleware Behavior
None	N/A	No tenant check (public, device-auth, global-admin-only routes)
Jwt	JWT tid claim	Inherently safe — tenant derived from token, no cross-tenant check needed
RouteParam	{tenantId} in route	Middleware extracts from path, enforces JWT tenant == route tenant (Global Admins exempt)
QueryParam	?tenantId= query	Middleware extracts from query string (falls back to JWT tenant), enforces cross-tenant check

How it works:

1. PolicyEnforcementMiddleware resolves the EndpointPolicyEntry for every request
2. For RouteParam/QueryParam scoping: extracts the target tenant ID from the request
3. Compares target tenant against JWT tid claim — rejects with 403 if mismatched (unless Global Admin)
4. Sets RequestContext.TargetTenantId for downstream use by function handlers
5. Fail-closed: unregistered routes get 403 automatically

Additional layers:

• All Table Storage queries filtered by PartitionKey = TenantId
• SignalR groups: tenant-{tenantId} for scoped broadcasts
• CrossTenantAccessTests validates that every tenant-scoped endpoint correctly rejects cross-tenant access

---

Real-Time Communication

SignalR Integration

• Hub: autopilotmonitor
• Transport: WebSocket with auto-reconnect (0s, 2s, 10s, 30s backoff)
• Token factory: Fresh JWT per connection attempt

Groups & Events

Group	Events	Triggered By
tenant-{tenantId}	newSession, sessionStatusChanged, eventReceived, ruleResultReceived	Event ingestion, session registration
global-admins	newSession (all tenants), platform stats updates	Cross-tenant broadcasts

Client-Side (SignalRContext)

• Auto-rejoin groups after reconnect
• Components subscribe on mount, unsubscribe on unmount
• Connection state exposed for UI indicators

---

Rules Engine

Three Rule Types

Type	Execution	Purpose
Gather Rules	Agent-side	Collect data from registry, WMI, event logs, files, commands
Analyze Rules	Backend-side	Detect issues in enrollment events with confidence scoring
IME Log Patterns	Agent-side	Parse IME/AppWorkload/HealthScripts logs with regex

Gather Rules

• Collector Types: registry, wmi, eventlog, file, command_allowlisted, logparser, json, xml
• Triggers: startup, interval, phase_change, on_event
• Security: Command allowlist enforced by GatherRuleGuards
• Output: Emits gather_result event with collected data

Analyze Rules

• Conditions: Match events by source, signal, operator, value, with event correlation
• Confidence Scoring: BaseConfidence + ConfidenceFactors (signal × weight), threshold at 40
• Output: RuleResult with explanation, remediation steps, related docs
• Trigger: Evaluated after enrollment completion/failure

IME Log Patterns

• Categories: always (all phases), currentPhase, otherPhases
• Actions: 50+ (e.g., setCurrentApp, updateStateInstalled, espPhaseDetected)
• Regex: Named capture groups, {GUID} placeholder for Intune policy IDs
• Tracked Logs: IntuneManagementExtension*.log, AppWorkload*.log, AgentExecutor*.log, HealthScripts*.log

Rule Distribution

1. Individual JSON files in rules/gather/, rules/analyze/, rules/ime-log-patterns/
2. GitHub Actions validates against JSON Schema + combines into rules/dist/
3. Combined files embedded as resources in Functions assembly
4. Served to agents via /api/agent/config, manageable via web UI per tenant
5. ReseedFromGitHub function can re-fetch from GitHub on demand

---

Session Lifecycle

Three Completion Paths

Path 1: IME Pattern Completion
  IME logs show all apps completed → Hello wait → enrollment_complete

Path 2: ESP Exit + Hello (Composite)
  ESP final exit (event 62407) → Hello wait (300s) → enrollment_complete

Path 3: Desktop Arrival (No-ESP / WDP v2)
  explorer.exe detected under real user → Hello wait → enrollment_complete

ESP & Hello Tracking

• ESP Events: Shell-Core event log (62404=Hello wizard start, 62407=ESP exit/WhiteGlove)
• Hello Events: User Device Registration log (300=NGC success, 301=NGC failure)
• Hello Wait: 30s for wizard start → 300s for completion → timeout
• HelloOutcome: Tracked property recording Hello result
• Policy Check: WHfB policy registry poll every 10s; skip Hello wait if not configured
• Provisioning Status: Registry-based ESP category status monitoring (GetProvisioningSnapshot()): DevicePreparation, DeviceSetup, AccountSetup. Settle delay before completion; 30s fallback timer for builds without categorySucceeded (e.g. 25H2/26200)

Failure Detection

• Terminal failures (Failure, Abort, WhiteGlove_Failed) → immediate enrollment_failed
• Recoverable failures (Timeout) → 60s grace period before marking failed
• Auth failures → circuit breaker (max 5 attempts or configurable timeout)
• Device-Only ESP: 5-min timer after DeviceSetup exit; if no AccountSetup → device-only classification
• WDP v2 gate skip: _enrollmentType == "v2" → desktop arrival gate skipped (no ESP in WDP v2)

WhiteGlove (Pre-Provisioning)

• Part 1: whiteglove_complete → persist state, exit gracefully (no self-destruct, session preserved)
• Part 2: Agent restarts on next boot, detects whiteglove.complete marker → whiteglove_resumed
• Session survives across reboot; sequence counter persisted

State Persistence (Crash Recovery)

File	Purpose
enrollment-state.json	ESP flags, Hello state, completion signals
ime-tracker-state.json	Phase order, seen apps, file positions
session.id / session.seq	Session identity + event sequence counter
enrollment-complete.marker	Cleanup retry flag if previous cleanup failed

Signal Audit Trail

Terminal events (enrollment_complete/enrollment_failed) include signalsSeen and signalTimestamps for full state machine transparency. Completion check events are throttled (1x/min/source) with full state machine snapshot.

Cleanup & Self-Destruct

1. Stop collectors, run shutdown analyzers
2. Drain event spool, final upload
3. Upload diagnostics ZIP (if configured)
4. Remove Scheduled Task, delete binaries/config/spool
5. Optionally reboot device (RebootOnComplete)

---

Configuration Hierarchy

AdminConfiguration (global, single row in Azure Table)
    │   GlobalRateLimitRequestsPerMinute (default 100)
    │   CollectorIdleTimeoutMinutes (default 15)
    │   AgentMaxLifetimeMinutes (default 360)
    │   DiagnosticsGlobalLogPathsJson
    │   LatestAgentSha256
    │
    └──► TenantConfiguration (per tenant, inherits/overrides)
            │   Rate limiting (override or inherit global)
            │   Hardware whitelist, Autopilot device validation
            │   Collector intervals, Hello timeout
            │   Diagnostics: UploadEnabled, LogPathsJson
            │   Auth circuit breaker settings
            │   Teams/Slack/Telegram notifications
            │   Bootstrap token enablement
            │   UnrestrictedMode
            │
            └──► AgentConfigResponse (delivered to agent via /api/agent/config)
                    │   ConfigVersion (currently 21)
                    │   CollectorConfiguration (nested)
                    │   AnalyzerConfiguration (nested)
                    │   GatherRules[] (merged built-in + tenant)
                    │   ImeLogPatterns[] (merged built-in + tenant)
                    │   DiagnosticsLogPaths[] (merged global + tenant)
                    │   LatestAgentSha256
                    └   Various flags and intervals

Caching: Both admin and tenant configs cached 5 minutes in-memory (IMemoryCache).

---

Diagnostics & Upload

Architecture (Post-Refactor)

• Old: Long-lived SAS URL stored in agent config → device stores in remote-config.json
• Newer: Agent calls POST /api/agent/upload-url just before upload → SAS URL never stored on device, memory-only
• Latest: Two destinations selectable per tenant via TenantConfiguration.DiagnosticsUploadDestination

Upload Destinations

Mode	Container	Blob path	SAS issuance	Default
CustomerSas	tenant's own storage account / container	AgentDiagnostics-{sessionId}-{ts}.zip (container root)	long-lived container SAS in TenantConfiguration.DiagnosticsBlobSasUrl, returned to the agent verbatim	yes — preserves prior behaviour
Hosted	backend's own Functions storage account, container diagnostics	{tenantId}/AgentDiagnostics-{sessionId}-{ts}.zip	per-upload, 15-min, blob-scoped Write+Create-only SAS minted by the backend (HostedDiagnosticsBlobService — User Delegation under MI, account-key SAS under connection string)	opt-in via explicit admin click in tenant settings UI

Session.DiagnosticsBlobDestination is set per upload from the backend response and travels with the row, so the download path can route correctly even after a tenant later switches modes for new uploads.

Upload Flow

1. Agent creates ZIP: sessioninfo.txt + agent logs + IME logs + configured paths + state/spool/markers (V2)
2. Agent calls POST /api/agent/upload-url → backend branches on tenant destination:
   • CustomerSas: returns the stored container SAS unchanged + BlobName = {filename}
   • Hosted: mints a fresh blob-scoped SAS pinned to {tenantId}/{filename} + returns it + BlobName = {tenantId}/{filename}
3. Agent uploads via PUT {blobUrl} with x-ms-blob-type: BlockBlob. URL construction is destination-aware (BuildBlobUploadUrl): Hosted SAS used as-is, CustomerSas SAS gets the blob name appended.
4. 3 retries with exponential backoff (2s, 4s, 8s); 401/403 = non-retryable
5. Agent reports diagnostics_uploaded event with blobName + destination in Data; backend stamps both onto the Sessions row

Download Flow

GET /api/diagnostics/download-url?tenantId=...&blobName=... → DiagnosticsDownloadFunction:

• Shape-classifies the blob name: contains / → Hosted; no slash → CustomerSas
• Hosted: streams via the backend connection string against diagnostics container; cross-tenant prefix mismatch rejected (defence-in-depth on top of TenantScoping middleware)
• CustomerSas: constructs blob URL from tenant SAS + streams (SAS never leaves the server)
• Both paths share size guard (AdminConfiguration.MaxDiagnosticsDownloadSizeMB) and timeout

Cascade-Delete

SessionDeletionHandler step §5b (DiagnosticsBlobCascadeDeleter):

• Hosted: always deletes (we own the storage)
• CustomerSas: deletes only when the SAS includes the d (Delete) permission (SasPermissionParser.HasDelete); otherwise log + skip — customer keeps lifecycle responsibility
• Idempotent (DeleteIfExistsAsync) + 404-safe; outcome recorded in DeletionProgress.DiagnosticsBlobDeleteDone

Diagnostics Log Paths

• Global paths: AdminConfiguration.DiagnosticsGlobalLogPathsJson (built-in, IsBuiltIn=true)
• Tenant paths: TenantConfiguration.DiagnosticsLogPathsJson (custom, IsBuiltIn=false)
• Merged list delivered to agent; security validated by DiagnosticsPathGuards

Upload Modes

Mode	Behavior
Off (default)	Disabled
Always	Upload on both success and failure
OnFailure	Upload only on enrollment failure

Applies to both destinations. CustomerSas additionally requires DiagnosticsBlobSasUrl to be populated.

Remote-Config Fetch Resilience (V2)

Initial GetAgentConfig fetch in V2 retries on transient errors (3 attempts, 10s/30s/60s linear backoff) — defends against Function App cold-starts post-deploy where a single-shot fetch would time out and silently strand the agent on built-in defaults. Auth failures (401/403) bail immediately. When the fallback path runs, the agent emits agent_started with configVersion=0/remoteConfigFetched=false/remoteConfigOutcome=UsedDefaults|FromCache and a dedicated remote_config_fetch_failed warning event — so a degraded run is visible on the wire, not just in the local agent log.

---

Vulnerability Management

Architecture

Software inventory collected by agent → correlated with CVE databases on backend → vulnerability reports per session.

Data Sources

Source	Service	Purpose
NIST NVD	NvdApiClient	CVE database with CPE matching
Microsoft MSRC	MsrcApiClient	Microsoft-specific security advisories
CISA KEV	KevDataService	Known Exploited Vulnerabilities feed

Flow

1. SoftwareInventoryAnalyzer captures installed software at agent start+shutdown
2. Events uploaded via normal ingest pipeline
3. VulnerabilityCorrelationService matches software against CVE data using CPE identifiers
4. VersionComparer handles semantic version comparison for affected version ranges
5. Results stored in VulnerabilityReports table, viewable in session detail UI
6. Custom CPE mappings configurable via admin UI for unmatched software
7. VulnerabilityDataSyncFunction periodically refreshes CVE cache

Search

Sessions can be searched by CVE ID via GET /api/search/sessions-by-cve, backed by the CveIndex table.

---

Notification System

Webhook Notifications

Enrollment completion/failure events trigger webhook notifications via WebhookNotificationService.

Provider	Renderer	Format
Teams Legacy Connector	LegacyTeamsConnectorRenderer	Office 365 Connector card
Teams Workflow Webhook	TeamsWorkflowAdaptiveCardRenderer	Adaptive Card
Slack	SlackRenderer	Block Kit

Configuration per tenant via TenantConfiguration.WebhookUrl + WebhookProviderType.

Rule Results in Notifications: NotificationAlertBuilder.AddRuleResultSections() appends significant analyze rule findings (warning/high/critical severity only, max 5) to enrollment completion/failure webhook alerts — giving admins immediate visibility into detected issues without visiting the portal.

Telegram Notifications

TelegramNotificationService sends enrollment notifications via Telegram bot API. Configured per tenant.

Email Notifications

ResendEmailService handles transactional emails via Resend.com API (used for Preview notifications).

In-App Notifications

GlobalNotificationService provides persistent notifications for Global Admins, stored in GlobalNotifications table. Survives page reloads, dismissable per user.

---

Testing

Backend Tests (src/Backend/AutopilotMonitor.Functions.Tests/)

Target: .NET 8.0, xUnit

Test File	Coverage
IngestCriticalPathTests	Regression guard for StampServerFields() — ensures ReceivedAt, TenantId, SessionId are stamped
SecurityValidatorTests	Certificate validation, rate limiting, hardware whitelist, device validation flows
DistressValidationTests	Distress report validation
DistressRateLimitServiceTests	Distress rate limiting
EventTimestampValidationTests	Timestamp clamping and validation
NdjsonParserTests	NDJSON parsing
BuiltInRulesTests	Built-in rule logic
EndpointPolicyCatalogCompletenessTests	Ensures every HTTP route has a catalog entry
CrossTenantAccessTests	Validates tenant-scoped endpoints reject cross-tenant access
ODataSanitizerTests	OData query sanitization
SsrfGuardTests	SSRF protection validation
AuthFunctionTests	Auth decision logic (roles, MCP access, bootstrap, auto-admin, preview gates)
GetHardwareRejectedFunctionTests	Hardware rejection aggregation logic

Agent Tests (src/Agent/AutopilotMonitor.Agent.Core.Tests/)

Target: .NET Framework 4.8, xUnit

Test File	Coverage
DesktopArrivalDetectorTests	Desktop arrival detection
DiagnosticsPathGuardsTests	Path guard validation
GatherRuleGuardsTests	Gather rule path/target guards
AppPackageStateListTests	App package state tracking
AppPackageStateTests	Individual package state machine
CmTraceLogParserTests	CMTrace log format parsing
EnrollmentStatePersistenceTests	State file persistence
LogFilePositionTrackerTests	Log file tail position bookmarking

---

Infrastructure & Deployment

Azure Resources

Resource	Purpose
Azure Functions (Isolated Worker)	REST API, event processing, timer triggers
Azure Table Storage	34 tables for sessions, events, config, rules, metrics, vulnerability data, ops events
Azure Blob Storage	Diagnostics ZIPs, session reports, platform stats cache, agent binaries
Azure SignalR Service	WebSocket hub for real-time updates
Azure Static Web Apps	Next.js frontend hosting
Azure Container App	MCP server (provisioned via infra/mcp-server.bicep)
Azure Container Registry	MCP server container images
Application Insights	Logging, telemetry, performance monitoring
Microsoft Entra ID	Multi-tenant OIDC authentication

MCP Server

Technology: Node.js/TypeScript, Model Context Protocol (MCP) over HTTP/SSE transport.

Architecture:

• Session-based protocol with per-session transport isolation
• JWT auth + backend whitelist via McpUserService
• Access control middleware (access-guard.ts) with rate limiting
• Graceful shutdown: SIGTERM/SIGINT handlers close all active session transports, then HTTP server
• Idle session reaping: 2h TTL, checked every 12h

Event Search Architecture:

• Weighted keyword scoring (replaced earlier Fuse fuzzy / vector embedding approaches that failed on structured data)
• Field weights: eventType (3.0), message (2.0), source (1.5), severity (1.0), data (0.5)
• Prefix-aware matching (handles morphological variants like "install" / "installation", min 4-char prefix)
• Stop-word filtering (50+ common words)
• Score normalization: (weighted_matches / max_possible) + coverage_bonus, capped at 1.0
• Knowledge base search still uses vector/Fuse search (pre-indexed at startup)

Structured Error Handler:

• Formats any tool error into MCP-compliant { isError: true } response with AI-consumable details
• Categorized hints: auth errors (403) → "requires higher permissions"; not found (404) → "verify IDs/filters"; rate limit (429) → "wait and retry"; timeout → "narrow the query"
• Always includes parameter summary for debugging

Provisioned via Bicep (infra/mcp-server.bicep):

• Azure Container Registry (Basic SKU)
• Log Analytics Workspace
• Container App Environment
• Container App (autopilotmonitor-mcp) running from ACR image

Bootstrap Deployment

scripts/Bootstrap/Install-AutopilotMonitor.ps1 — Intune Platform Script (.ps1):

• Deployed early in Autopilot enrollment via Intune
• Downloads agent ZIP from blob storage, verifies SHA-256 integrity
• Runs AutopilotMonitor.Agent.exe --install
• Multi-signal guard: registry marker, OOBE state, WMI/filesystem user profile, 12h bootstrap window (prevents ghost sessions)
• Test-ShouldBootstrapAgent.ps1 — standalone test for guard logic
• Uninstall-AutopilotMonitor.ps1 — manual cleanup

Agent Build & Upload

scripts/Deployment/build_and_upload_release_agent_build.ps1:

• Builds agent solution in Release mode
• Creates ZIP package
• Computes SHA-256 hash
• Uploads ZIP + version.json (with hash) to Azure Blob Storage

CI/CD (GitHub Actions)

Workflow	Trigger	Purpose
azure-static-web-apps-*.yml	Push to main (Web changes)	Build + deploy Next.js to Azure Static Web Apps
combine-rules.yml	Changes to rules/, schema/, scripts/	Validate rules against JSON Schema, combine into dist/, auto-commit

Environment Variables (Web)

NEXT_PUBLIC_ENTRA_CLIENT_ID                 # App registration client ID
NEXT_PUBLIC_ENTRA_REDIRECT_URI              # Auth redirect (localhost:3000 dev)
NEXT_PUBLIC_ENTRA_POST_LOGOUT_REDIRECT_URI
NEXT_PUBLIC_API_BASE_URL                    # Backend URL (localhost:7071 dev)
NEXT_PUBLIC_PLATFORM_STATS_MANIFEST_URL

---

Build & Development

Build Commands

# .NET solution (Agent + Backend + Shared)
dotnet build AutopilotMonitor.sln --nologo -v quiet

# Backend tests
dotnet test src/Backend/AutopilotMonitor.Functions.Tests/

# Agent tests
dotnet test src/Agent/AutopilotMonitor.Agent.Core.Tests/

# Web frontend
cd src/Web/autopilot-monitor-web
npm install
npm run dev          # Development server (localhost:3000)
npm run build        # Production build
npx tsc --noEmit     # Type checking only

# Rules validation + combine
cd rules && node scripts/combine.js

Agent CLI Arguments

--install                           Deploy via Scheduled Task (Intune package)
--run-gather-rules                  One-shot data collection, then exit
--run-ime-matching                  Offline IME log parsing, write ime_pattern_matching.log
--console                           Enable console output
--log-level {level}                 Set log level (debug/info/warning/error)
--api-url {url}                     Override API endpoint (alias: --backend-api)
--bootstrap-token {token}           Pre-MDM bootstrap auth
--ime-log-path {path}               Override IME log folder
--ime-match-log {path}              Write matched IME log lines to file (debug)
--replay-log-dir {path}             Enable log replay mode
--replay-speed-factor {n}           Compression factor (default 50)
--no-cleanup                        Disable self-destruct
--reboot-on-complete                Trigger reboot after enrollment
--new-session                       Start fresh session
--keep-logfile                      Preserve logs after cleanup
--await-enrollment                  Wait for MDM certificate before starting
--await-enrollment-timeout {min}    MDM cert wait timeout (default 480min)
--disable-geolocation               Skip geo-location detection

Key Design Conventions

Convention	Details
Agent endpoint security	All agent endpoints use req.ValidateSecurityAsync() from SecurityValidationExtensions.cs
Route policy catalog	Every HTTP route MUST be registered in EndpointAccessPolicyCatalog (fail-closed → 403)
ConfigVersion	Tracks agent capability level (currently 21 = NTP time check + timezone auto-set)
Phase progression	Forward-only: DeviceSetup(1) → AccountSetup(2), no backward transitions
Phase isolation	App IDs seen in earlier phases are ignored in later phases (IME tracker)
Completion throttling	Max 1 completion_check event per source per minute
Sequence persistence	Saved every 50 events + on critical events; crash recovery uses spool ceiling
Settings UI	error + successMessage state for notifications at top of <main>
Maintenance timer	Runs every 2 hours (not daily, despite function name)
Agent versioning	Auto-incremented: 1.0.{BuildNumber}
Timestamp clamping	Preserves originals + flags for troubleshooting
Bootstrap scripts	Must be pure ASCII (no em-dashes/Unicode) — PS 5.1 compatibility