OpenScan 🤘

OpenScan is an open-source security scanning and asset discovery platform. It continuously monitors your internet-facing assets — domains, subdomains, IPs, and ports — and alerts you when things change.

"Monitor your websites and servers in one place. Lock the doors before anyone gets in."

Features

🔍 Asset Discovery

Subdomain Discovery — Automatically discover subdomains and internet-facing assets using multiple tools
Host Discovery — Ping sweeps and IP/CIDR range scanning to find live hosts
HTTP Service Probing — Enrich discovered hosts with HTTP metadata (status codes, titles, headers, tech stack)

🔒 Port Scanning

Multi-Scanner Engine — Combines masscan (ultra-fast, all ports), rustscan (fast with service detection), and nmap (deep fingerprinting) for comprehensive coverage
Smart Port Merging — Deduplicates and merges results from multiple scanners automatically
Service Detection — Identifies running services, versions, and operating systems
Scheduled Scanning — Configurable scan schedules (QUICK, STANDARD, THOROUGH) with automatic retries and failure escalation

📊 Asset Inventory

Servers Dashboard — Centralized view of all discovered servers with status filtering
Device Detail — Per-device view with open ports, services, scan history, CVE vulnerabilities, and activity timeline
Tagging & Organization — Organize assets by projects and tags

🛡️ Vulnerability Management

CVE Enrichment — Automatically cross-references detected services with known CVEs
Severity Scoring — CVSS-based severity classification (CRITICAL, HIGH, MEDIUM, LOW, INFO)
Vulnerability Timeline — Track when vulnerabilities appear and get resolved

📬 Change Detection & Notifications

Real-time Change Detection — Automatically detects new ports, closed ports, service drift, and CVE changes between scan runs
Email Alerts — Rich HTML email notifications via Resend with categorized templates
Telegram Alerts — Optional Telegram bot integration for instant notifications
Suppression Windows — Configurable quiet periods to avoid alert fatigue
Notification Preferences — Per-organization severity filtering for each channel

🖼️ Screenshot Capture

Browser Rendering — Cloudflare Browser Rendering API captures live screenshots of web services
R2 Storage — Screenshots stored in Cloudflare R2 for long-term retention

🏢 Hosting Provider Detection

IP Enrichment — Automatically detects cloud/hosting providers for discovered IPs (AWS, GCP, Azure, DigitalOcean, etc.)

👥 Organization Management

Multi-tenant — Organizations with member management and role-based access
Onboarding Flow — Guided setup: create account → create project → asset discovery → notification configuration
Project Isolation — Assets and scans scoped to projects within organizations

Architecture

OpenScan uses a distributed microservices architecture with durable workflow orchestration:

┌─────────────────────────────────────────────────────────────────┐
│                        Cloudflare Workers                        │
│                                                                  │
│  ┌─────────────┐   ┌───────────────┐   ┌──────────────────────┐ │
│  │   Web App    │   │ Data Service  │   │ Screenshot Worker    │ │
│  │ (TanStack    │   │ (Notifications│   │ (Browser Rendering)  │ │
│  │  Start/React)│   │  Delivery)    │   │                      │ │
│  └──────┬───────┘   └──────┬────────┘   └──────────┬───────────┘ │
│         │                  │                        │             │
│         │    Cloudflare D1 (SQLite)                 │             │
│         │    Cloudflare R2 (Screenshots)            │             │
└─────────┼──────────────────┼────────────────────────┼─────────────┘
          │                  │                        │
          │     HTTP Postback (Universal Format)       │
          │                  │                        │
          ▼                  ▼                        ▼
┌──────────────────────────────────────────────────────────────┐
│                    Restate Worker                              │
│  ┌─────────────┐ ┌──────────────┐ ┌────────────────────────┐ │
│  │   Discovery  │ │ Port Scanner │ │  Scan Executor         │ │
│  │   Service    │ │ (masscan/    │ │  (Scheduled Scanning)  │ │
│  │              │ │  rustscan)   │ │                        │ │
│  └─────────────┘ └──────────────┘ └────────────────────────┘ │
│  ┌─────────────┐ ┌──────────────┐ ┌────────────────────────┐ │
│  │  HTTPx       │ │  Hosting     │ │  Device Scanner        │ │
│  │  Service     │ │  Enrichment  │ │  (Virtual Objects)     │ │
│  └─────────────┘ └──────────────┘ └────────────────────────┘ │
│              Durable Workflow Orchestration                   │
└──────────────────────────────────────────────────────────────┘

Key Technologies

Layer	Technology
Frontend	TanStack Start (React 19) + TanStack Router + TanStack Query
Styling	Tailwind CSS v4 + Radix UI Primitives
Workflow Orchestration	Restate — Durable execution engine
Edge Compute	Cloudflare Workers
Database	Cloudflare D1 (Serverless SQLite)
ORM	Drizzle ORM — Type-safe SQL
Auth	Better Auth
RPC	tRPC v11 — End-to-end type-safe APIs
Email	Resend + React Email templates
Validation	Zod — Runtime type validation
Package Manager	pnpm workspaces
Language	TypeScript (strict mode)

Communication Pattern: Universal Postback

Restate workers communicate with the web app via HTTP callbacks — a simple, robust pattern:

Web app invokes a Restate workflow via HTTP API
Restate worker executes the durable workflow (scanning, discovery, etc.)
Worker sends results back via HTTP POST to the web app (the "postback")
Web app processes and persists the results

This decouples the scanning pipeline from the application layer, making each component independently deployable and testable.

Project Structure

openscan/
├── apps/
│   ├── web/                      # 🌐 Main web application
│   │   ├── src/
│   │   │   ├── routes/           # TanStack file-based routing
│   │   │   ├── features/         # Feature modules (servers, scans, discovery, etc.)
│   │   │   ├── components/       # Reusable UI components (Radix + Tailwind)
│   │   │   ├── queries/          # TanStack Query + tRPC hooks
│   │   │   ├── modals/           # Modal dialogs
│   │   │   ├── server/           # Server functions & postback handlers
│   │   │   └── lib/              # Utilities, auth client, tRPC setup
│   │   ├── public/               # Static assets + _routes.json
│   │   ├── worker/               # Cloudflare Worker entry
│   │   └── wrangler.jsonc        # Cloudflare deployment config
│   │
│   ├── restate-worker/           # 🔄 Durable workflow orchestration
│   │   ├── src/
│   │   │   ├── discovery-service.ts     # Subdomain/host discovery
│   │   │   ├── port-scanner.ts          # Port scanning orchestrator
│   │   │   ├── device-scanner-service.ts# Scheduled scanning (Virtual Objects)
│   │   │   ├── scan-executor-service.ts # Scan execution logic
│   │   │   ├── httpx-service.ts         # HTTP service probing
│   │   │   ├── hosting-enrichment-service.ts # Cloud provider detection
│   │   │   ├── scanners/               # masscan, rustscan implementations
│   │   │   ├── xml-parser/             # Nmap XML result parsing
│   │   │   └── postback.ts             # Universal postback helper
│   │   └── src/__tests__/              # Integration & unit tests
│   │
│   ├── data-service/            # 📬 Notification delivery worker
│   │   ├── src/
│   │   │   └── index.ts         # Queue consumer + Hono API
│   │   ├── emails/              # React Email templates
│   │   └── wrangler.jsonc
│   │
│   └── screenshot-worker/       # 📸 Browser screenshot worker
│       ├── src/
│       │   ├── handlers/        # Capture, HTTPx, health endpoints
│       │   ├── services/        # Browser rendering, storage, postback
│       │   └── types/           # Environment & type definitions
│       └── wrangler.jsonc
│
├── packages/
│   ├── data-ops/                # 🗄️ Database operations (single source of truth)
│   │   ├── src/
│   │   │   ├── schema/          # Drizzle schema definitions
│   │   │   ├── queries/         # Database queries (devices, scans, notifications, etc.)
│   │   │   ├── auth/            # Better Auth server setup
│   │   │   └── database/        # D1 connection & initialization
│   │   └── migrations/          # SQL migrations
│   │
│   ├── contracts/               # 📋 Shared types, schemas, and contracts
│   │   ├── postbacks/           # Universal postback payload schemas
│   │   ├── scanners/            # Scanner configuration types
│   │   └── artifacts/           # Scan artifact types
│   │
│   ├── validation/              # ✅ Shared Zod validation schemas
│   ├── constants/               # 🔢 Shared constants & utilities
│   ├── config/                  # ⚙️ Shared configuration
│   └── logger/                  # 📝 Shared logging utilities
│
├── docs/                        # 📚 Documentation
│   ├── architecture/            # System architecture docs
│   ├── features/                # Feature-specific documentation
│   │   ├── notifications/       # Notification delivery system
│   │   ├── scans/               # Scan architecture
│   │   ├── discovery/           # Discovery workflow
│   │   └── ...
│   └── practices/               # Development guidelines
│
├── scripts/                     # Utility scripts
├── pnpm-workspace.yaml
├── tsconfig.base.json
└── README.md

Prerequisites

Node.js 22.x (required — the project uses .nvmrc)
pnpm 10+
Wrangler CLI — npm install -g wrangler
Restate — Local or Cloud deployment (docs)
Cloudflare account — For D1, Workers, R2, and Queues

Getting Started

# 1. Clone the repository
git clone https://github.com/your-org/openscan.git
cd openscan

# 2. Use the correct Node.js version
nvm use

# 3. Install dependencies and build shared packages
pnpm run setup

# 4. Set up environment variables
cp apps/web/.env.example apps/web/.env
cp apps/restate-worker/.env.example apps/restate-worker/.env

# 5. Run database migrations
cd packages/data-ops
pnpm drizzle-kit push
cd ../..

Development

Web Application

pnpm run dev:web
# Starts at http://localhost:13000

Restate Worker

pnpm run dev:worker
# Starts Restate endpoint on port 9080

Data Service (Notification Delivery)

cd apps/data-service
pnpm run dev

Screenshot Worker

cd apps/screenshot-worker
pnpm run dev

Deployment

Web Application (Cloudflare Workers)

pnpm run deploy:web

Data Service (Cloudflare Workers)

pnpm run deploy:data-service

Screenshot Worker (Cloudflare Workers)

pnpm run deploy:screenshot-worker

Restate Worker (Restate Cloud or Self-hosted)

Refer to apps/restate-worker/README.md for detailed deployment instructions.

Notification Delivery System

OpenScan includes a comprehensive notification pipeline:

Port Scan Complete → Change Detection → Create Notifications
                                              ↓
                                    Filter by Org Severity Preferences
                                              ↓
                                    Enqueue to Cloudflare Queue
                                              ↓
                                    Data Service Consumes Queue
                                              ↓
                                    Send Emails via Resend + Telegram

Supported Event Types:

🔴 New critical/high-priority ports discovered
🟡 New CVEs detected on existing services
🔵 Service drift (version changes, product changes)
⚪ Closed/downtime ports
🟢 Server promoted from candidate to verified
📋 Batch scan summaries

See docs/features/notifications/operations.md for full details.

Documentation

The docs/ directory contains comprehensive documentation:

Topic	Location
Architecture Overview	`docs/architecture/`
Postback System	`docs/architecture/backend/postback-architecture.md`
Notification Delivery	`docs/features/notifications/`
Scan Architecture	`docs/features/scans/`
Discovery Workflows	`docs/features/discovery/`
Scheduled Scanning	`docs/features/schedules/`
Service Detection	`docs/architecture/service-detection/`
Optimistic UI Patterns	`docs/optimistic-ui.md`
Development Best Practices	`docs/practices/`

Package Details

`@repo/data-ops` — Database Operations

Single source of truth for all database queries. The golden rule: never import database internals directly in apps — always use exported query functions.

// ✅ Correct
import { getDevicesForTenant, createDevicesInProject } from "@repo/data-ops";

// ❌ Wrong
import { getDb } from "@repo/data-ops/database/setup";
import { devices } from "@repo/data-ops/schema";

`@repo/contracts` — Shared Types & Schemas

Domain types that serve as the single source of truth across UI, workers, and data-ops. Includes postback payload schemas with Zod runtime validation.

Database

Cloudflare D1 (SQLite) with Drizzle ORM
Schema-first approach with Zod validation at all layers
CI/CD: Type-level tests catch schema drift across packages

Testing

# Run all tests
pnpm -r test

# Restate worker tests (integration + unit)
cd apps/restate-worker
pnpm run test:run

# Data service tests
cd apps/data-service
pnpm run test

# Type checking
pnpm -r typecheck

Contributing

We use beads for dependency-aware issue tracking. All issues are prefixed with sec- (e.g., sec-42).

bd list -s open     # View open issues
bd ready            # See unblocked work
bd show sec-42      # View issue details

License

ISC

Name		Name	Last commit message	Last commit date
Latest commit History 375 Commits
.beads		.beads
.claude/agents		.claude/agents
.github		.github
apps		apps
docs		docs
packages		packages
scripts		scripts
.ckignore		.ckignore
.gitignore		.gitignore
.nvmrc		.nvmrc
AGENTS.md		AGENTS.md
CLAUDE.md		CLAUDE.md
README.md		README.md
package.json		package.json
pnpm-lock.yaml		pnpm-lock.yaml
pnpm-workspace.yaml		pnpm-workspace.yaml
tsconfig.base.json		tsconfig.base.json

Folders and files

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OpenScan 🤘

Features

🔍 Asset Discovery

🔒 Port Scanning

📊 Asset Inventory

🛡️ Vulnerability Management

📬 Change Detection & Notifications

🖼️ Screenshot Capture

🏢 Hosting Provider Detection

👥 Organization Management

Architecture

Key Technologies

Communication Pattern: Universal Postback

Project Structure

Prerequisites

Getting Started

Development

Web Application

Restate Worker

Data Service (Notification Delivery)

Screenshot Worker

Deployment

Web Application (Cloudflare Workers)

Data Service (Cloudflare Workers)

Screenshot Worker (Cloudflare Workers)

Restate Worker (Restate Cloud or Self-hosted)

Notification Delivery System

Documentation

Package Details

@repo/data-ops — Database Operations

@repo/contracts — Shared Types & Schemas

Database

Testing

Contributing

License

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`@repo/data-ops` — Database Operations

`@repo/contracts` — Shared Types & Schemas

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