Nuclei is a template-based vulnerability scanner written in Go. It allows users to define security checks using YAML or JSON templates, which can be executed against a wide range of targets via multiple protocols (HTTP, DNS, network, file, etc.). The scanner features a modular architecture with a core engine that orchestrates template execution, a template system for parsing and compiling checks, and protocol-specific implementations for sending requests and processing responses. Key features include workflow chaining for multi-step attacks, fuzzing capabilities for dynamic application security testing, JavaScript extensibility for custom logic in templates, and integrations with various issue trackers and cloud platforms for result reporting. The project emphasizes performance through optimizations like template clustering (deduplicating identical requests across templates) and connection pooling. The codebase demonstrates strong engineering practices in several areas: a self-contained template clustering system for request deduplication, a JavaScript binding generation system that automates the creation of Goja-compatible libraries, a workflow context propagation system for sharing data between template steps, and a cryptographic template signing mechanism to ensure integrity. These components are designed to be reusable and showcase non-obvious solutions to common problems in security tooling. Maintenance is active with recent commits and a vibrant community. The project keeps pace with its ecosystem, showing low technical drift through regular updates to dependencies and active maintenance of generated code. Its extensive test suite and CI/CD pipelines further indicate a healthy, well-maintained project.
OneForAll is a comprehensive subdomain enumeration and reconnaissance tool designed for security researchers and penetration testers. It aggregates subdomains from over 60 passive sources (certificate transparency logs, DNS datasets, search engines, threat intelligence feeds, and web crawlers), performs active brute-forcing via massdns, and enriches results with DNS resolution, HTTP probing, CDN detection, wildcard filtering, and subdomain takeover risk assessment. The tool is built as a modular Python CLI application, with each data source implemented as an independent plugin inheriting from base classes in `common/`. Output is stored in a SQLite database and can be exported to CSV, JSON, XLSX, and other formats. While primarily an application, the repository also includes curated data files (subdomain wordlists, CDN CIDR ranges, cloud service fingerprints) that are valuable for security research.