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https://github.com/trimstray/the-book-of-secret-knowledge

A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools and more.
https://github.com/trimstray/the-book-of-secret-knowledge

List: the-book-of-secret-knowledge

awesome awesome-list bsd cheatsheets devops guidelines hacking hacks howtos linux lists manuals one-liners pentesters resources search-engines security security-researchers sysops

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A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools and more.

Awesome Lists containing this project

README 

        


  

    Master

  




"Knowledge is powerful, be careful how you use it!"



A collection of inspiring lists, manuals, cheatsheets, blogs, hacks, one-liners, cli/web tools, and more.









  

    Pull Requests

  

  

    MIT License

  






  

    

  






  Created by

  trimstray and

  contributors










****



## :notebook_with_decorative_cover:  What is it?



This repository is a collection of various materials and tools that I use every day in my work. It contains a lot of useful information gathered in one piece. It is an invaluable source of knowledge for me that I often look back on.



## :restroom:  For whom?



For everyone, really. Here everyone can find their favourite tastes. But to be perfectly honest, it is aimed towards System and Network administrators, DevOps, Pentesters, and Security Researchers.



## :information_source:  Contributing



If you find something which doesn't make sense, or something doesn't seem right, please make a pull request and please add valid and well-reasoned explanations about your changes or comments.



A few simple rules for this project:



- inviting and clear

- not tiring

- useful



These below rules may be better:



- easy to contribute to (Markdown + HTML ...)

- easy to find (simple TOC, maybe it's worth extending them?)



Url marked **\*** is temporary unavailable. Please don't delete it without confirming that it has permanently expired.



Before adding a pull request, please see the **[contributing guidelines](.github/CONTRIBUTING.md)**. You should also remember about this:



```diff

+ This repository is not meant to contain everything but only good quality stuff.

```



All **suggestions/PR** are welcome!



### Code Contributors



This project exists thanks to all the people who contribute.






### Financial Contributors





  

    

  

  

    

  




## :newspaper:  RSS Feed & Updates



GitHub exposes an [RSS/Atom](https://github.com/trimstray/the-book-of-secret-knowledge/commits.atom) feed of the commits, which may also be useful if you want to be kept informed about all changes.



## :ballot_box_with_check:  ToDo



- [ ] Add new stuff...

- [ ] Add useful shell functions

- [ ] Add one-liners for collection tools (eg. CLI Tools)

- [ ] Sort order in lists



New items are also added on a regular basis.



## :anger:  Table of Contents



Only main chapters:



- **[CLI Tools](#cli-tools-toc)**

- **[GUI Tools](#gui-tools-toc)**

- **[Web Tools](#web-tools-toc)**

- **[Systems/Services](#systemsservices-toc)**

- **[Networks](#networks-toc)**

- **[Containers/Orchestration](#containersorchestration-toc)**

- **[Manuals/Howtos/Tutorials](#manualshowtostutorials-toc)**

- **[Inspiring Lists](#inspiring-lists-toc)**

- **[Blogs/Podcasts/Videos](#blogspodcastsvideos-toc)**

- **[Hacking/Penetration Testing](#hackingpenetration-testing-toc)**

- **[Your daily knowledge and news](#your-daily-knowledge-and-news-toc)**

- **[Other Cheat Sheets](#other-cheat-sheets-toc)**

- **[Shell One-liners](#shell-one-liners-toc)**

- **[Shell Tricks](#shell-tricks-toc)**

- **[Shell Functions](#shell-functions-toc)**



## :trident:  The Book of Secret Knowledge (Chapters)



#### CLI Tools  [[TOC]](#anger-table-of-contents)



##### :black_small_square: Shells





   GNU Bash - is an sh-compatible shell that incorporates useful features from the Korn shell and C shell.


   Zsh - is a shell designed for interactive use, although it is also a powerful scripting language.


   tclsh - is a very powerful cross-platform shell, suitable for a huge range of uses.


   bash-it - is a framework for using, developing and maintaining shell scripts and custom commands.


   Oh My ZSH! - is the best framework for managing your Zsh configuration.


   Oh My Fish - the Fishshell framework.


   Starship - the cross-shell prompt written in Rust.


   powerlevel10k - is a fast reimplementation of Powerlevel9k ZSH theme.





##### :black_small_square: Shell plugins





   z - tracks the folder you use the most and allow you to jump, without having to type the whole path.


   fzf - is a general-purpose command-line fuzzy finder.


   zsh-autosuggestions - Fish-like autosuggestions for Zsh.


   zsh-syntax-highlighting - Fish shell like syntax highlighting for Zsh.


   Awesome ZSH Plugins - A list of frameworks, plugins, themes and tutorials for ZSH.





##### :black_small_square: Managers





   Midnight Commander - is a visual file manager, licensed under GNU General Public License.


   ranger - is a VIM-inspired filemanager for the console.


   nnn - is a tiny, lightning fast, feature-packed file manager.


   screen - is a full-screen window manager that multiplexes a physical terminal.


   tmux - is a terminal multiplexer, lets you switch easily between several programs in one terminal.


   tmux-cssh - is a tool to set comfortable and easy to use functionality tmux-sessions.





##### :black_small_square: Text editors





   vi - is one of the most common text editors on Unix.


   vim - is a highly configurable text editor.


   emacs - is an extensible, customizable, free/libre text editor, and more.


   micro - is a modern and intuitive terminal-based text editor.


   neovim - is a free open source, powerful, extensible and usable code editor.


   spacemacs - a community-driven Emacs distribution.


   spacevim - a community-driven vim distribution.





##### :black_small_square: Files and directories





   fd - is a simple, fast and user-friendly alternative to find.


   ncdu - is an easy to use, fast disk usage analyzer.





##### :black_small_square: Network





   PuTTY - is an SSH and telnet client, developed originally by Simon Tatham.


   Mosh - is a SSH wrapper designed to keep a SSH session alive over a volatile connection.


   Eternal Terminal - enables mouse-scrolling and tmux commands inside the SSH session.


   nmap - is a free and open source (license) utility for network discovery and security auditing.


   zmap - is a fast single packet network scanner designed for Internet-wide network surveys.


   Rust Scan - to find all open ports faster than Nmap.


   masscan - is the fastest Internet port scanner, spews SYN packets asynchronously.


   pbscan - is a faster and more efficient stateless SYN scanner and banner grabber.


   hping - is a command-line oriented TCP/IP packet assembler/analyzer.


   mtr - is a tool that combines the functionality of the 'traceroute' and 'ping' programs in a single tool.


   mylg - utility which combines the functions of the different network probes in one diagnostic tool.


   netcat - utility which reads and writes data across network connections, using the TCP/IP protocol.


   socat - utility which transfers data between two objects.


   tcpdump - is a powerful command-line packet analyzer.


   tshark - is a tool that allows us to dump and analyze network traffic (wireshark cli).


   Termshark - is a simple terminal user-interface for tshark.


   ngrep - is like GNU grep applied to the network layer.


   netsniff-ng - is a Swiss army knife for your daily Linux network plumbing if you will.


   sockdump - dump unix domain socket traffic.


   stenographer - is a packet capture solution which aims to quickly spool all packets to disk.


   tcpterm - visualize packets in TUI.


   bmon - is a monitoring and debugging tool to capture networking related statistics and prepare them visually.


   iptraf-ng - is a console-based network monitoring program for Linux that displays information about IP traffic.


   vnstat - is a network traffic monitor for Linux and BSD.


   iPerf3 - is a tool for active measurements of the maximum achievable bandwidth on IP networks.


   ethr - is a Network Performance Measurement Tool for TCP, UDP & HTTP.


   Etherate - is a Linux CLI based Ethernet and MPLS traffic testing tool.


   echoip - is a IP address lookup service.


   Nemesis - packet manipulation CLI tool; craft and inject packets of several protocols.


   packetfu - a mid-level packet manipulation library for Ruby.


   Scapy - packet manipulation library; forge, send, decode, capture packets of a wide number of protocols.


   impacket - is a collection of Python classes for working with network protocols.


   ssh-audit - is a tool for SSH server auditing.


   aria2 - is a lightweight multi-protocol & multi-source command-line download utility.


   iptables-tracer - observe the path of packets through the iptables chains.


   inception - a highly configurable tool to check for whatever you like against any number of hosts.


   mRemoteNG - a fork of mRemote, multi-tabbed PuTTy on steroids!





##### :black_small_square: Network (DNS)





   dnsdiag - is a DNS diagnostics and performance measurement tools.


   fierce - is a DNS reconnaissance tool for locating non-contiguous IP space.


   subfinder - is a subdomain discovery tool that discovers valid subdomains for websites.


   sublist3r - is a fast subdomains enumeration tool for penetration testers.


   amass - is tool that obtains subdomain names by scraping data sources, crawling web archives, and more.


   namebench - provides personalized DNS server recommendations based on your browsing history.


   massdns - is a high-performance DNS stub resolver for bulk lookups and reconnaissance.


   knock - is a tool to enumerate subdomains on a target domain through a wordlist.


   dnsperf - DNS performance testing tools.


   dnscrypt-proxy 2 - a flexible DNS proxy, with support for encrypted DNS protocols.


   dnsdbq - API client providing access to passive DNS database systems.


   grimd - fast dns proxy, built to black-hole internet advertisements and malware servers.


     dnstwist - detect typosquatters, phishing attacks, fraud, and brand impersonation.





##### :black_small_square: Network (HTTP)





   curl - is a command line tool and library for transferring data with URLs.


   kurly - is an alternative to the widely popular curl program, written in Golang.


   HTTPie - is an user-friendly HTTP client.


   wuzz - is an interactive cli tool for HTTP inspection.


   h2spec - is a conformance testing tool for HTTP/2 implementation.


   h2t - is a simple tool to help sysadmins to hardening their websites.


   htrace.sh - is a simple Swiss Army knife for http/https troubleshooting and profiling.


   httpstat - is a tool that visualizes curl statistics in a way of beauty and clarity.


   httplab - is an interactive web server.


   Lynx - is a text browser for the World Wide Web.


   Browsh - is a fully interactive, real-time, and modern text-based browser.


   HeadlessBrowsers - a list of (almost) all headless web browsers in existence.


   ab - is a single-threaded command line tool for measuring the performance of HTTP web servers.


   siege - is an http load testing and benchmarking utility.


   wrk - is a modern HTTP benchmarking tool capable of generating significant load.


   wrk2 - is a constant throughput, correct latency recording variant of wrk.


   vegeta - is a constant throughput, correct latency recording variant of wrk.


   bombardier - is a fast cross-platform HTTP benchmarking tool written in Go.


   gobench - http/https load testing and benchmarking tool.


   hey - HTTP load generator, ApacheBench (ab) replacement, formerly known as rakyll/boom.


   boom - is a script you can use to quickly smoke-test your web app deployment.


   SlowHTTPTest - is a tool that simulates some Application Layer Denial of Service attacks by prolonging HTTP.


   gobuster - is a free and open source directory/file & DNS busting tool written in Go.


   ssllabs-scan - command-line reference-implementation client for SSL Labs APIs.


   http-observatory - Mozilla HTTP Observatory cli version.


   Hurl - is a command line tool to run and test HTTP requests with plain text.





##### :black_small_square: SSL





   openssl - is a robust, commercial-grade, and full-featured toolkit for the TLS and SSL protocols.


   gnutls-cli - client program to set up a TLS connection to some other computer.


   sslyze

 - fast and powerful SSL/TLS server scanning library.


   sslscan - tests SSL/TLS enabled services to discover supported cipher suites.


   testssl.sh - testing TLS/SSL encryption anywhere on any port.


   cipherscan - a very simple way to find out which SSL ciphersuites are supported by a target.


   spiped - is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses.


   Certbot - is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server.


   mkcert - simple zero-config tool to make locally trusted development certificates with any names you'd like.


   certstrap - tools to bootstrap CAs, certificate requests, and signed certificates.


   Sublert - is a security and reconnaissance tool to automatically monitor new subdomains.


   mkchain - open source tool to help you build a valid SSL certificate chain.


   ssl-cert-check - SSL Certification Expiration Checker.





##### :black_small_square: Security





   SELinux - provides a flexible Mandatory Access Control (MAC) system built into the Linux kernel.


   AppArmor - proactively protects the operating system and applications from external or internal threats.


   grapheneX - Automated System Hardening Framework.


   DevSec Hardening Framework - Security + DevOps: Automatic Server Hardening.





##### :black_small_square: Auditing Tools





   ossec - actively monitoring all aspects of system activity with file integrity monitoring.


   auditd - provides a way to track security-relevant information on your system.


   Tiger - is a security tool that can be use both as a security audit and intrusion detection system.


   Lynis - battle-tested security tool for systems running Linux, macOS, or Unix-based operating system.


   LinEnum - scripted Local Linux Enumeration & Privilege Escalation Checks.


   Rkhunter - scanner tool for Linux systems that scans backdoors, rootkits and local exploits on your systems.


   PE-sieve - is a light-weight tool that helps to detect malware running on the system.


   PEASS - privilege escalation tools for Windows and Linux/Unix and MacOS.





##### :black_small_square: System Diagnostics/Debuggers





   strace - diagnostic, debugging and instructional userspace utility for Linux.


   DTrace - is a performance analysis and troubleshooting tool.


   ltrace - is a library call tracer, used to trace calls made by programs to library functions.


   ptrace-burrito - is a friendly wrapper around ptrace.


   perf-tools - performance analysis tools based on Linux perf_events (aka perf) and ftrace.


   bpftrace - high-level tracing language for Linux eBPF.


   sysdig - system exploration and troubleshooting tool with first class support for containers.


   Valgrind - is an instrumentation framework for building dynamic analysis tools.


   gperftools - high-performance multi-threaded malloc() implementation, plus some performance analysis tools.


   glances - cross-platform system monitoring tool written in Python.


   htop - interactive text-mode process viewer for Unix systems. It aims to be a better 'top'.


   bashtop - Linux resource monitor written in pure Bash.


   nmon - a single executable for performance monitoring and data analysis.


   atop - ASCII performance monitor. Includes statistics for CPU, memory, disk, swap, network, and processes.


   lsof - displays in its output information about files that are opened by processes.


   FlameGraph - stack trace visualizer.


   lsofgraph - convert Unix lsof output to a graph showing FIFO and UNIX interprocess communication.


   rr - is a lightweight tool for recording, replaying and debugging execution of applications.


   Performance Co-Pilot - a system performance analysis toolkit.


   hexyl - a command-line hex viewer.


   Austin - Python frame stack sampler for CPython.





##### :black_small_square: Log Analyzers





   angle-grinder - slice and dice log files on the command line.


   lnav - log file navigator with search and automatic refresh.


   GoAccess - real-time web log analyzer and interactive viewer that runs in a terminal.


   ngxtop - real-time metrics for nginx server.





##### :black_small_square: Databases





   usql - universal command-line interface for SQL databases.


   pgcli - postgres CLI with autocompletion and syntax highlighting.


   mycli - terminal client for MySQL with autocompletion and syntax highlighting.


   litecli - SQLite CLI with autocompletion and syntax highlighting.


     mssql-cli - SQL Server CLI with autocompletion and syntax highlighting.


   OSQuery - is a SQL powered operating system instrumentation, monitoring, and analytics framework.


   pgsync - sync data from one Postgres database to another.


   iredis - a terminal client for redis with autocompletion and syntax highlighting.


   SchemaCrawler - generates an E-R diagram of your database.





##### :black_small_square: TOR





   Nipe - script to make Tor Network your default gateway.


   multitor - a tool that lets you create multiple TOR instances with a load-balancing.





##### :black_small_square: Messengers/IRC Clients





   Irssi - is a free open source terminal based IRC client.


   WeeChat - is an extremely extensible and lightweight IRC client.





##### :black_small_square: Productivity





   taskwarrior - task management system, todo list 





##### :black_small_square: Other





   sysadmin-util - tools for Linux/Unix sysadmins.


   incron - is an inode-based filesystem notification technology.


   lsyncd - synchronizes local directories with remote targets (Live Syncing Daemon).


   GRV - is a terminal based interface for viewing Git repositories.


   Tig - text-mode interface for Git.


   tldr - simplified and community-driven man pages.


   archiver - easily create and extract .zip, .tar, .tar.gz, .tar.bz2, .tar.xz, .tar.lz4, .tar.sz, and .rar.


   commander.js - minimal CLI creator in JavaScript.


   gron - make JSON greppable!


   bed - binary editor written in Go.





#### GUI Tools  [[TOC]](#anger-table-of-contents)



##### :black_small_square: Terminal emulators





   Guake - is a dropdown terminal made for the GNOME desktop environment.


   Terminator - is based on GNOME Terminal, useful features for sysadmins and other users.


   Kitty - is a GPU based terminal emulator that supports smooth scrolling and images.


   Alacritty - is a fast, cross-platform, OpenGL terminal emulator.





##### :black_small_square: Network





   Wireshark - is the world’s foremost and widely-used network protocol analyzer.


   Ettercap - is a comprehensive network monitor tool.


   EtherApe - is a graphical network monitoring solution.


   Packet Sender - is a networking utility for packet generation and built-in UDP/TCP/SSL client and servers.


   Ostinato - is a packet crafter and traffic generator.


   JMeter™ - open source software to load test functional behavior and measure performance.


   locust - scalable user load testing tool written in Python.





##### :black_small_square: Browsers





   TOR Browser - protect your privacy and defend yourself against network surveillance and traffic analysis.





##### :black_small_square: Password Managers





   KeePassXC - store your passwords safely and auto-type them into your everyday websites and apps.


   Bitwarden - open source password manager with built-in sync.


   Vaultwarden - unofficial Bitwarden compatible server written in Rust.





##### :black_small_square: Messengers/IRC Clients





   HexChat - is an IRC client based on XChat.


   Pidgin - is an easy to use and free chat client used by millions.





##### :black_small_square: Messengers (end-to-end encryption)





   Signal - is an encrypted communications app.


   Wire - secure messaging, file sharing, voice calls and video conferences.


   TorChat - decentralized anonymous instant messenger on top of Tor Hidden Services.


   Matrix - an open network for secure, decentralized, real-time communication.





##### :black_small_square: Text editors





   Sublime Text - is a lightweight, cross-platform code editor known for its speed, ease of use.


   Visual Studio Code - an open-source and free source code editor developed by Microsoft.


   Atom - a hackable text editor for the 21st Century.





#### Web Tools  [[TOC]](#anger-table-of-contents)



##### :black_small_square: Browsers





   SSL/TLS Capabilities of Your Browser - test your browser's SSL implementation.


   Can I use - provides up-to-date browser support tables for support of front-end web technologies.


   Panopticlick 3.0 - is your browser safe against tracking?


   Privacy Analyzer - see what data is exposed from your browser.


   Web Browser Security - it's all about Web Browser fingerprinting.


   How's My SSL? - help a web server developer learn what real world TLS clients were capable of.


   sslClientInfo - client test (incl TLSv1.3 information).





##### :black_small_square: SSL/Security





   SSLLabs Server Test - performs a deep analysis of the configuration of any SSL web server.


   SSLLabs Server Test (DEV) - performs a deep analysis of the configuration of any SSL web server.


   ImmuniWeb® SSLScan - test SSL/TLS (PCI DSS, HIPAA and NIST).


   SSL Check - scan your website for non-secure content.


   SSL Scanner - analyze website security.


   CryptCheck - test your TLS server configuration (e.g. ciphers).


   urlscan.io - service to scan and analyse websites.


   Report URI - monitoring security policies like CSP and HPKP.


   CSP Evaluator - allows developers and security experts to check if a Content Security Policy.


   Useless CSP - public list about CSP in some big players (might make them care a bit more).


   Why No HTTPS? - top 100 websites by Alexa rank not automatically redirecting insecure requests.


   TLS Cipher Suite Search- cipher suite search engine.


   cipherli.st - strong ciphers for Apache, Nginx, Lighttpd, and more.*


   dhtool - public Diffie-Hellman parameter service/tool.


   badssl.com - memorable site for testing clients against bad SSL configs.


   tlsfun.de - registered for various tests regarding the TLS/SSL protocol.


   CAA Record Helper - generate a CAA policy.


   Common CA Database - repository of information about CAs, and their root and intermediate certificates.


   CERTSTREAM - real-time certificate transparency log update stream.


   crt.sh - discovers certificates by continually monitoring all of the publicly known CT.


   Hardenize - deploy the security standards.


   Cipher suite compatibility - test TLS cipher suite compatibility.


   urlvoid - this service helps you detect potentially malicious websites.


   security.txt - a proposed standard (generator) which allows websites to define security policies.


   ssl-config-generator - help you follow the Mozilla Server Side TLS configuration guidelines.


   TLScan - pure python, SSL/TLS protocol and cipher scanner/enumerator.





##### :black_small_square: HTTP Headers & Web Linters





   Security Headers - analyse the HTTP response headers (with rating system to the results).


   Observatory by Mozilla - set of tools to analyze your website.


   webhint - is a linting tool that will help you with your site's accessibility, speed, security, and more.





##### :black_small_square: DNS





   ViewDNS - one source for free DNS related tools and information.


   DNSLookup - is an advanced DNS lookup tool.


   DNSlytics - online DNS investigation tool.


   DNS Spy - monitor, validate and verify your DNS configurations.


   Zonemaster - helps you to control how your DNS works.


   Leaf DNS - comprehensive DNS tester.


   Find subdomains online - find subdomains for security assessment penetration test.


   DNSdumpster - dns recon & research, find & lookup dns records.


   DNS Table online - search for DNS records by domain, IP, CIDR, ISP.


   intoDNS - DNS and mail server health checker.


   DNS Bajaj - check the delegation of your domain.


   BuddyDNS Delegation LAB - check, trace and visualize delegation of your domain.


   dnssec-debugger - DS or DNSKEY records validator.


   PTRarchive.com - this site is responsible for the safekeeping of historical reverse DNS records.


   xip.io - wildcard DNS for everyone.


   nip.io - dead simple wildcard DNS for any IP Address.


   dnslookup (ceipam) - one of the best DNS propagation checker (and not only).


   What's My DNS - DNS propagation checking tool.


   DNSGrep - quickly searching large DNS datasets.





##### :black_small_square: Mail





   smtp-tls-checker - check an email domain for SMTP TLS support.


   MX Toolbox - all of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.


   Secure Email - complete email test tools for email technicians.


   blacklistalert - checks to see if your domain is on a Real Time Spam Blacklist.


   MultiRBL - complete IP check for sending Mailservers.


   DKIM SPF & Spam Assassin Validator - checks mail authentication and scores messages with Spam Assassin.





##### :black_small_square: Encoders/Decoders and Regex testing





   URL Encode/Decode - tool from above to either encode or decode a string of text.


   Uncoder - the online translator for search queries on log data.


   Regex101 - online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript.


   RegExr - online tool to learn, build, & test Regular Expressions (RegEx / RegExp).


   RegEx Testing - online regex testing tool.


   RegEx Pal - online regex testing tool + other tools.


   The Cyber Swiss Army Knife - a web app for encryption, encoding, compression and data analysis.





##### :black_small_square: Net-tools





   Netcraft - detailed report about the site, helping you to make informed choices about their integrity.*


   RIPE NCC Atlas - a global, open, distributed Internet measurement platform.


   Robtex - uses various sources to gather public information about IP numbers, domain names, host names, etc.


   Security Trails - APIs for Security Companies, Researchers and Teams.


   Online Curl - curl test, analyze HTTP Response Headers.


   Online Tools for Developers - HTTP API tools, testers, encoders, converters, formatters, and other tools.


   Ping.eu - online Ping, Traceroute, DNS lookup, WHOIS and others.


   Network-Tools - network tools for webmasters, IT technicians & geeks.


   BGPview - search for any ASN, IP, Prefix or Resource name.


   Is BGP safe yet? - check BGP (RPKI) security of ISPs and other major Internet players.


   Riseup - provides online communication tools for people and groups working on liberatory social change.


   VirusTotal - analyze suspicious files and URLs to detect types of malware.





##### :black_small_square: Privacy





   privacyguides.org - provides knowledge and tools to protect your privacy against global mass surveillance.


   DNS Privacy Test Servers - DNS privacy recursive servers list (with a 'no logging' policy).





##### :black_small_square: Code parsers/playgrounds





   ShellCheck - finds bugs in your shell scripts.


   explainshell - get interactive help texts for shell commands.


   jsbin - live pastebin for HTML, CSS & JavaScript, and more.


   CodeSandbox - online code editor for web application development.


   PHP Sandbox - test your PHP code with this code tester.


   Repl.it - an instant IDE to learn, build, collaborate, and host all in one place.


   vclFiddle - is an online tool for experimenting with the Varnish Cache VCL.


   Haskell Dockerfile Linter - a smarter Dockerfile linter that helps you build best practice Docker images.





##### :black_small_square: Performance





   GTmetrix - analyze your site’s speed and make it faster.


   Sucuri loadtimetester - test here the

performance of any of your sites from across the globe.


   Pingdom Tools - analyze your site’s speed around the world.


   PingMe.io - run website latency tests across multiple geographic regions.


   PageSpeed Insights - analyze your site’s speed and make it faster.


   web.dev - helps developers like you learn and apply the web's modern capabilities to your own sites and apps.


   Lighthouse - automated auditing, performance metrics, and best practices for the web.





##### :black_small_square: Mass scanners (search engines)





   Censys - platform that helps information security practitioners discover, monitor, and analyze devices.


   Shodan - the world's first search engine for Internet-connected devices.


   Shodan 2000 - this tool looks for randomly generated data from Shodan.


   GreyNoise - mass scanner such as Shodan and Censys.


   ZoomEye - search engine for cyberspace that lets the user find specific network components.


   netograph - tools to monitor and understand deep structure of the web.


   FOFA - is a cyberspace search engine.


   onyphe - is a search engine for open-source and cyber threat intelligence data collected.


   IntelligenceX - is a search engine and data archive.


   binaryedge - it scan the entire internet space and create real-time threat intelligence streams and reports.


   Spyse - Internet assets registry: networks, threats, web objects, etc.


   wigle - is a submission-based catalog of wireless networks. All the networks. Found by Everyone.


   PublicWWW - find any alphanumeric snippet, signature or keyword in the web pages HTML, JS and CSS code.


   IntelTechniques - this repository contains hundreds of online search utilities.


   hunter - lets you find email addresses in seconds and connect with the people that matter for your business.


   GhostProject? - search by full email address or username.


   databreaches - was my email affected by data breach?


   We Leak Info - world's fastest and largest data breach search engine.


   Pulsedive - scans of malicious URLs, IPs, and domains, including port scans and web requests.


   Buckets by Grayhatwarfar - database with public search for Open Amazon S3 Buckets and their contents.


   Vigilante.pw - the breached database directory.


   builtwith - find out what websites are built with.


   NerdyData - search the web's source code for technologies, across millions of sites.


   zorexeye - search for sites, images, apps, softwares & more.


   Mamont's open FTP Index - if a target has an open FTP site with accessible content it will be listed here.


   OSINT Framework - focused on gathering information from free tools or resources.


   maltiverse - is a service oriented to cybersecurity analysts.


   Leaked Source - is a collaboration of data found online in the form of a lookup.


   We Leak Info - to help everyday individuals secure their online life, avoiding getting hacked.


   pipl - is the place to find the person behind the email address, social username or phone number.


   abuse.ch - is operated by a random swiss guy fighting malware for non-profit.


   malc0de - malware search engine.


   Cybercrime Tracker - monitors and tracks various malware families that are used to perpetrate cyber crimes.


   shhgit - find GitHub secrets in real time.


   searchcode - helping you find real world examples of functions, API's and libraries.


   Insecam - the world biggest directory of online surveillance security cameras.


   index-of - contains great stuff like: security, hacking, reverse engineering, cryptography, programming etc.


   Rapid7 Labs Open Data - is a great resources of datasets from Project Sonar.


   Common Response Headers - the largest database of HTTP response headers.


   InQuest Labs - InQuest Labs is an open, interactive, and API driven data portal for security researchers.





##### :black_small_square: Generators





   thispersondoesnotexist - generate fake faces in one click - endless possibilities.


   AI Generated Photos - 100.000 AI generated faces.


   fakenamegenerator - your randomly generated identity.


   Intigriti Redirector - open redirect/SSRF payload generator.





##### :black_small_square: Passwords





   have i been pwned? - check if you have an account that has been compromised in a data breach.


   dehashed - is a hacked database search engine.


   Leaked Source - is a collaboration of data found online in the form of a lookup.





##### :black_small_square: CVE/Exploits databases





   CVE Mitre - list of publicly known cybersecurity vulnerabilities.


   CVE Details - CVE security vulnerability advanced database.


   Exploit DB - CVE compliant archive of public exploits and corresponding vulnerable software.


   0day.today - exploits market provides you the possibility to buy/sell zero-day exploits.


   sploitus - the exploit and tools database.


   cxsecurity - free vulnerability database.


   Vulncode-DB - is a database for vulnerabilities and their corresponding source code if available.


   cveapi - free API for CVE data.





##### :black_small_square: Mobile apps scanners





   ImmuniWeb® Mobile App Scanner - test security and privacy of mobile apps (iOS & Android).


   Quixxi - free Mobile App Vulnerability Scanner for Android & iOS.


   Ostorlab - analyzes mobile application to identify vulnerabilities and potential weaknesses.





##### :black_small_square: Private Search Engines





   Startpage - the world's most private search engine.


   searX - a privacy-respecting, hackable metasearch engine.


   darksearch - the 1st real Dark Web search engine.


   Qwant - the search engine that respects your privacy.


   DuckDuckGo - the search engine that doesn't track you.


   Swisscows - privacy safe web search


   Disconnect - the search engine that anonymizes your searches.


   MetaGer - the search engine that uses anonymous proxy and hidden Tor branches.





##### :black_small_square: Secure Webmail Providers





   CounterMail - online email service, designed to provide maximum security and privacy.


   Mail2Tor - is a Tor Hidden Service that allows anyone to send and receive emails anonymously.


   Tutanota - is the world's most secure email service and amazingly easy to use.


   Protonmail - is the world's largest secure email service, developed by CERN and MIT scientists.


   Startmail - private & encrypted email made easy.





##### :black_small_square: Crypto





   Keybase - it's open source and powered by public-key cryptography.





##### :black_small_square: PGP Keyservers





   SKS OpenPGP Key server - services for the SKS keyservers used by OpenPGP.





#### Systems/Services  [[TOC]](#anger-table-of-contents)



##### :black_small_square: Operating Systems





   Slackware - the most "Unix-like" Linux distribution.


   OpenBSD - multi-platform 4.4BSD-based UNIX-like operating system.


   HardenedBSD - HardenedBSD aims to implement innovative exploit mitigation and security solutions.


   Kali Linux - Linux distribution used for Penetration Testing, Ethical Hacking and network security assessments.


   Parrot Security OS - cyber security GNU/Linux environment.


   Backbox Linux - penetration test and security assessment oriented Ubuntu-based Linux distribution.


   BlackArch - is an Arch Linux-based penetration testing distribution for penetration testers.


   Pentoo - is a security-focused livecd based on Gentoo.


   Security Onion - Linux distro for intrusion detection, enterprise security monitoring, and log management.


   Tails - is a live system that aims to preserve your privacy and anonymity.


   vedetta - OpenBSD router boilerplate.


   Qubes OS - is a security-oriented OS that uses Xen-based virtualization.





##### :black_small_square: HTTP(s) Services





   Varnish Cache - HTTP accelerator designed for content-heavy dynamic web sites.


   Nginx - open source web and reverse proxy server that is similar to Apache, but very light weight.


   OpenResty - is a dynamic web platform based on NGINX and LuaJIT.


   Tengine - a distribution of Nginx with some advanced features.


   Caddy Server - is an open source, HTTP/2-enabled web server with HTTPS by default.


   HAProxy - the reliable, high performance TCP/HTTP load balancer.





##### :black_small_square: DNS Services





   Unbound - validating, recursive, and caching DNS resolver (with TLS).


   Knot Resolver - caching full resolver implementation, including both a resolver library and a daemon.


   PowerDNS - is an open source authoritative DNS server, written in C++ and licensed under the GPL.





##### :black_small_square: Other Services





   3proxy - tiny free proxy server.





##### :black_small_square: Security/hardening





   Emerald Onion - is a 501(c)(3) nonprofit organization and transit internet service provider (ISP).


   pi-hole - the Pi-hole® is a DNS sinkhole that protects your devices from unwanted content.


   maltrail - malicious traffic detection system.


   security_monkey - monitors AWS, GCP, OpenStack, and GitHub orgs for assets and their changes over time.


   firecracker - secure and fast microVMs for serverless computing.


   streisand - sets up a new server running your choice of WireGuard, OpenSSH, OpenVPN, and more.





#### Networks  [[TOC]](#anger-table-of-contents)



##### :black_small_square: Tools





   CapAnalysis - web visual tool to analyze large amounts of captured network traffic (PCAP analyzer).


   netbox - IP address management (IPAM) and data center infrastructure management (DCIM) tool.





##### :black_small_square: Labs





   NRE Labs - learn automation by doing it. Right now, right here, in your browser.





##### :black_small_square: Other





   LBNL's Network Research Group - home page of the Network Research Group (NRG).





#### Containers/Orchestration  [[TOC]](#anger-table-of-contents)



##### :black_small_square: CLI Tools





   gvisor - container runtime sandbox.


   ctop - top-like interface for container metrics.





##### :black_small_square: Web Tools





   Moby - a collaborative project for the container ecosystem to assemble container-based system.


   Traefik - open source reverse proxy/load balancer provides easier integration with Docker and Let's encrypt.


   kong - The Cloud-Native API Gateway.


   rancher - complete container management platform.


   portainer - making Docker management easy.


   nginx-proxy - automated nginx proxy for Docker containers using docker-gen.


   bunkerized-nginx - nginx docker image "secure by default".





##### :black_small_square: Security





   docker-bench-security - checks for dozens of common best-practices around deploying Docker.


   trivy - vulnerability scanner for containers, suitable for CI.


   Harbor - cloud native registry project that stores, signs, and scans content.


   Houdini - hundreds of offensive and useful docker images for network intrusion.





##### :black_small_square: Manuals/Tutorials/Best Practices





   docker-cheat-sheet - a quick reference cheat sheet on Docker.


   awesome-docker - a curated list of Docker resources and projects.


   docker_practice - learn and understand Docker technologies, with real DevOps practice!


   labs

 - is a collection of tutorials for learning how to use Docker with various tools.


   dockerfiles - various Dockerfiles I use on the desktop and on servers.


   kubernetes-the-hard-way - bootstrap Kubernetes the hard way on Google Cloud Platform. No scripts.


   kubernetes-the-easy-way - bootstrap Kubernetes the easy way on Google Cloud Platform. No scripts.


   cheatsheet-kubernetes-A4 - Kubernetes CheatSheets in A4.


   k8s-security - kubernetes security notes and best practices.


   kubernetes-production-best-practices - checklists with best-practices for production-ready Kubernetes.


   kubernetes-production-best-practices - kubernetes security - best practice guide.


   kubernetes-failure-stories - is a compilation of public failure/horror stories related to Kubernetes.





#### Manuals/Howtos/Tutorials  [[TOC]](#anger-table-of-contents)



##### :black_small_square: Shell/Command line





   pure-bash-bible - is a collection of pure bash alternatives to external processes.


   pure-sh-bible - is a collection of pure POSIX sh alternatives to external processes.


   bash-guide - is a guide to learn bash.


   bash-handbook - for those who wanna learn Bash.


   The Bash Hackers Wiki - hold documentation of any kind about GNU Bash.


   Shell & Utilities - describes the commands offered to application programs by POSIX-conformant systems.


   the-art-of-command-line - master the command line, in one page.


   Shell Style Guide - a shell style guide for Google-originated open-source projects.





##### :black_small_square: Text Editors





   Vim Cheat Sheet - great multi language vim guide.





##### :black_small_square: Python





   Awesome Python - a curated list of awesome Python frameworks, libraries, software and resources.


   python-cheatsheet - comprehensive Python cheatsheet.


   pythoncheatsheet.org - basic reference for beginner and advanced developers.





##### :black_small_square: Sed & Awk & Other





   F’Awk Yeah! - advanced sed and awk usage (Parsing for Pentesters 3).





##### :black_small_square: \*nix & Network





   nixCraft - linux and unix tutorials for new and seasoned sysadmin.


   TecMint - the ideal Linux blog for Sysadmins & Geeks.


   Omnisecu - free Networking, System Administration and Security tutorials.


   linux-cheat - Linux tutorials and cheatsheets. Minimal examples. Mostly user-land CLI utilities.


   linuxupskillchallenge - learn the skills required to sysadmin.


   Unix Toolbox - Unix/Linux/BSD commands and tasks which are useful for IT work or for advanced users.


   Linux Kernel Teaching - is a collection of lectures and labs Linux kernel topics.


   htop explained - explanation of everything you can see in htop/top on Linux.


   Linux Guide and Hints - tutorials on system administration in Fedora and CentOS.


   strace-little-book - a little book which introduces strace.


   linux-tracing-workshop - examples and hands-on labs for Linux tracing tools workshops.


   http2-explained - a detailed document explaining and documenting HTTP/2.


   http3-explained - a document describing the HTTP/3 and QUIC protocols.


   HTTP/2 in Action - an excellent introduction to the new HTTP/2 standard.


   Let's code a TCP/IP stack - great stuff to learn network and system programming at a deeper level.


   Nginx Admin's Handbook - how to improve NGINX performance, security and other important things.


   nginxconfig.io - NGINX config generator on steroids.


   openssh guideline - is to help operational teams with the configuration of OpenSSH server and client.


   SSH Handshake Explained - is a relatively brief description of the SSH handshake.


   ISC's Knowledgebase - you'll find some general information about BIND 9, ISC DHCP, and Kea DHCP.


   PacketLife.net - a place to record notes while studying for Cisco's CCNP certification.





##### :black_small_square: Microsoft





   AD-Attack-Defense - attack and defend active directory using modern post exploitation activity.





##### :black_small_square: Large-scale systems





   The System Design Primer - learn how to design large-scale systems.


   Awesome Scalability - best practices in building High Scalability, High Availability, High Stability, and more.


   Web Architecture 101 - the basic architecture concepts.





##### :black_small_square: System hardening





   CIS Benchmarks - secure configuration settings for over 100 technologies, available as a free PDF.


   Security Harden CentOS 7 - this walks you through the steps required to security harden CentOS.


   CentOS 7 Server Hardening Guide - great guide for hardening CentOS; familiar with OpenSCAP.


   awesome-security-hardening - is a collection of security hardening guides, tools and other resources.


   The Practical Linux Hardening Guide - provides a high-level overview of hardening GNU/Linux systems.


   Linux Hardening Guide - how to harden Linux as much as possible for security and privacy.





##### :black_small_square: Security & Privacy





   Hacking Articles - LRaj Chandel's Security & Hacking Blog.


   AWS security tools - make your AWS cloud environment more secure.


   Rawsec's CyberSecurity Inventory - an inventory of tools and resources about CyberSecurity.


   The Illustrated TLS Connection - every byte of a TLS connection explained and reproduced.


   SSL Research - SSL and TLS Deployment Best Practices by SSL Labs.


   SELinux Game - learn SELinux by doing. Solve Puzzles, show skillz.


   Certificates and PKI - everything you should know about certificates and PKI but are too afraid to ask.


   The Art of Subdomain Enumeration - a reference for subdomain enumeration techniques.


   Quitting Google - the comprehensive guide to quitting Google.





##### :black_small_square: Web Apps





   OWASP - worldwide not-for-profit charitable organization focused on improving the security of software.


   OWASP ASVS 3.0.1 - OWASP Application Security Verification Standard Project.


   OWASP ASVS 3.0.1 Web App - simple web app that helps developers understand the ASVS requirements.


   OWASP ASVS 4.0 - is a list of application security requirements or tests.


   OWASP Testing Guide v4 - includes a "best practice" penetration testing framework.


   OWASP Dev Guide - this is the development version of the OWASP Developer Guide.


   OWASP WSTG - is a comprehensive open source guide to testing the security of web apps.


   OWASP API Security Project - focuses specifically on the top ten vulnerabilities in API security.


   Mozilla Web Security - help operational teams with creating secure web applications.


   security-bulletins - security bulletins that relate to Netflix Open Source.


   API-Security-Checklist - security countermeasures when designing, testing, and releasing your API.


   Enable CORS - enable cross-origin resource sharing.


   Application Security Wiki - is an initiative to provide all application security related resources at one place.


   Weird Proxies - reverse proxy related attacks; it is a result of analysis of various proxies.


   Webshells - great series about malicious payloads.


   Practical Web Cache Poisoning - show you how to compromise websites by using esoteric web features.


   Hidden directories and files - as a source of sensitive information about web application.


   Explosive blog - great blog about cybersec and pentests.


   Security Cookies - this paper will take a close look at cookie security.


   APISecurityBestPractices - help you keep secrets (API keys, db credentials, certificates) out of source code.





##### :black_small_square: All-in-one





   LZone Cheat Sheets - all cheat sheets.


   Dan’s Cheat Sheets’s - massive cheat sheets documentation.


   Rico's cheatsheets - this is a modest collection of cheatsheets.


   DevDocs API - combines multiple API documentations in a fast, organized, and searchable interface.


   cheat.sh - the only cheat sheet you need.


   gnulinux.guru - collection of cheat sheets about bash, vim and networking.


   Web Skills - visual overview of useful skills to learn as a web developer.





##### :black_small_square: Ebooks





   free-programming-books - list of free learning resources in many languages.





##### :black_small_square: Other





   CTF Series : Vulnerable Machines - the steps below could be followed to find vulnerabilities and exploits.


   50M_CTF_Writeup - $50 million CTF from Hackerone - writeup.


   ctf-tasks - an archive of low-level CTF challenges developed over the years.


   How to start RE/malware analysis? - collection of some hints and useful links for the beginners.


   The C10K problem - it's time for web servers to handle ten thousand clients simultaneously, don't you think?


   How 1500 bytes became the MTU of the internet - great story about the Maximum Transmission Unit.


   poor man's profiler - like dtrace's don't really provide methods to see what programs are blocking on.


   HTTPS on Stack Overflow - this is the story of a long journey regarding the implementation of SSL.


   Julia's Drawings - some drawings about programming and unix world, zines about systems & debugging tools.


   Hash collisions - this great repository is focused on hash collisions exploitation.


   sha256-animation - animation of the SHA-256 hash function in your terminal.


   sha256algorithm - sha256 algorithm explained online step by step visually.


   BGP Meets Cat - after 3072 hours of manipulating BGP, Job Snijders has succeeded in drawing a Nyancat.


   bgp-battleships - playing battleships over BGP.


   What happens when... - you type google.com into your browser and press enter?


   how-web-works - based on the 'What happens when...' repository.


   HTTPS in the real world - great tutorial explain how HTTPS works in the real world.


   Gitlab and NFS bug - how we spent two weeks hunting an NFS bug in the Linux kernel.


   Gitlab melts down - postmortem on the database outage of January 31 2017 with the lessons we learned.


   How To Become A Hacker - if you want to be a hacker, keep reading.


   Operation Costs in CPU - should help to estimate costs of certain operations in CPU clocks.


   Let's Build a Simple Database - writing a sqlite clone from scratch in C.


   simple-computer - great resource to understand how computers work under the hood.


   The story of "Have I been pwned?" - working with 154 million records on Azure Table Storage.


   TOP500 Supercomputers - shows the 500 most powerful commercially available computer systems.


   How to build a 8 GPU password cracker - hours of frustration like desktop components do.


   CERN Data Centre - 3D visualizations of the CERN computing environments (and more).


   How fucked is my database - evaluate how fucked your database is with this handy website.


   Linux Troubleshooting 101 , 2016 Edition - everything is a DNS Problem...


   Five Whys - you know what the problem is, but you cannot solve it?


   Maersk, me & notPetya - how did ransomware successfully hijack hundreds of domain controllers?


   howhttps.works - how HTTPS works ...in a comic!


   howdns.works - a fun and colorful explanation of how DNS works.


   POSTGRESQLCO.NF - your postgresql.conf documentation and recommendations.





#### Inspiring Lists  [[TOC]](#anger-table-of-contents)



##### :black_small_square: SysOps/DevOps





   Awesome Sysadmin - amazingly awesome open source sysadmin resources.


   Awesome Shell - awesome command-line frameworks, toolkits, guides and gizmos.


   Command-line-text-processing - finding text to search and replace, sorting to beautifying, and more.


   Awesome Pcaptools - collection of tools developed by other researchers to process network traces.


   awesome-ebpf - a curated list of awesome projects related to eBPF.


   Linux Network Performance - where some of the network sysctl variables fit into the Linux/Kernel network flow.


   Awesome Postgres - list of awesome PostgreSQL software, libraries, tools and resources.


   quick-SQL-cheatsheet - a quick reminder of all SQL queries and examples on how to use them.


   Awesome-Selfhosted - list of Free Software network services and web applications which can be hosted locally.


   List of applications - huge list of apps sorted by category, as a reference for those looking for packages.


   CS-Interview-Knowledge-Map - build the best interview map.


   DevOps-Guide - DevOps Guide from basic to advanced with Interview Questions and Notes.


   FreeBSD Journal - it is a great list of periodical magazines about FreeBSD and other important things.


   devops-interview-questions - contains interview questions on various DevOps and SRE related topics.



##### :black_small_square: Developers





   Web Developer Roadmap - roadmaps, articles and resources to help you choose your path, learn and improve.


   Front-End-Checklist - the perfect Front-End Checklist for modern websites and meticulous developers.


   Front-End-Performance-Checklist - Front-End Performance Checklist that runs faster than the others.


   Python's Magic Methods - what are magic methods? They're everything in object-oriented Python.


   wtfpython - a collection of surprising Python snippets and lesser-known features.


   js-dev-reads - a list of books and articles for the discerning web developer to read.


   Commit messages guide - a guide to understand the importance of commit messages.





##### :black_small_square: Security/Pentesting





   Awesome Web Security - a curated list of Web Security materials and resources.


   awesome-cyber-skills - a curated list of hacking environments where you can train your cyber skills.


   awesome-devsecops - an authoritative list of awesome devsecops tools.


   awesome-osint - is a curated list of amazingly awesome OSINT.


   HolyTips - tips and tutorials on Bug Bounty Hunting and Web App Security.


   awesome-threat-intelligence - a curated list of Awesome Threat Intelligence resources.


   Red-Teaming-Toolkit - a collection of open source and commercial tools that aid in red team operations.


   awesome-burp-extensions - a curated list of amazingly awesome Burp Extensions.


   Free Security eBooks - list of a Free Security and Hacking eBooks.


   Hacking-Security-Ebooks - top 100 Hacking & Security E-Books.


   privacy-respecting - curated list of privacy respecting services and software.


   reverse-engineering - list of awesome reverse engineering resources.


   linux-re-101 - a collection of resources for linux reverse engineering.


   reverseengineering-reading-list - a list of Reverse Engineering articles, books, and papers.


   Awesome-WAF - a curated list of awesome web-app firewall (WAF) stuff.


   awesome-shodan-queries - interesting, funny, and depressing search queries to plug into shodan.io.


   RobotsDisallowed - a curated list of the most common and most interesting robots.txt disallowed directories.


   HackingNeuralNetworks - is a small course on exploiting and defending neural networks.


   wildcard-certificates - why you probably shouldn't use a wildcard certificate.


   Don't use VPN services -  which is what every third-party "VPN provider" does.


   awesome-yara - a curated list of awesome YARA rules, tools, and people.


   macOS-Security-and-Privacy-Guide - guide to securing and improving privacy on macOS.


   macos_security - macOS Security Compliance Project.


   awesome-sec-talks - is a collected list of awesome security talks.


   Movies for Hackers - list of movies every hacker & cyberpunk must watch.


   Cryptography_1 - materials used whilst taking Prof. Dan Boneh Stanford Crypto course.


   Crypton - library to learn and practice Offensive and Defensive Cryptography.





##### :black_small_square: Other





   Cheatography - over 3,000 free cheat sheets, revision aids and quick references.


   awesome-static-analysis - static analysis tools for all programming languages.


   computer-science - path to a free self-taught education in Computer Science.


   post-mortems - is a collection of postmortems (config errors, hardware failures, and more).


   build-your-own-x - build your own (insert technology here).


   Project-Based-Tutorials-in-C - is a curated list of project-based tutorials in C.


   The-Documentation-Compendium - various README templates & tips on writing high-quality documentation.


   awesome-python-applications - free software that works great, and also happens to be open-source Python.


   awesome-public-datasets - a topic-centric list of HQ open datasets.


   machine-learning-algorithms - a curated list of all machine learning algorithms and concepts.





#### Blogs/Podcasts/Videos  [[TOC]](#anger-table-of-contents)



##### :black_small_square: SysOps/DevOps





   Varnish for PHP developers - very interesting presentation of Varnish by Mattias Geniar.


   A Netflix Guide to Microservices - talks about the chaotic and vibrant world of microservices at Netflix.





##### :black_small_square: Developers





   Comparing C to machine lang - compare a simple C app with the compiled machine code of that program.





##### :black_small_square: Geeky Persons





   Brendan Gregg's Blog - is an industry expert in computing performance and cloud computing.


   Gynvael "GynDream" Coldwind - is a IT security engineer at Google.


   Michał "lcamtuf" Zalewski - white hat hacker, computer security expert.


   Mattias Geniar - developer, sysadmin, blogger, podcaster and public speaker.


   Nick Craver - software developer and systems administrator for Stack Exchange.


   Scott Helme - security researcher, speaker and founder of securityheaders.com and report-uri.com.


   Brian Krebs - The Washington Post and now an Independent investigative journalist.


   Bruce Schneier - is an internationally renowned security technologist, called a "security guru".


   Chrissy Morgan - advocate of practical learning, Chrissy also takes part in bug bounty programs.


   Andy Gill - is a hacker at heart who works as a senior penetration tester.


   Daniel Miessler - cybersecurity expert and writer.


   Samy Kamkar -  is an American privacy and security researcher, computer hacker.


   Javvad Malik - is a security advocate at AlienVault, a blogger event speaker and industry commentator.


   Graham Cluley - public speaker and independent computer security analyst.


   Kacper Szurek - detection engineer at ESET.


   Troy Hunt - web security expert known for public education and outreach on security topics.


   raymii.org - sysadmin specializing in building high availability cloud environments.


   Robert Penz - IT security expert.





##### :black_small_square: Geeky Blogs





   Linux Audit - the Linux security blog about auditing, hardening and compliance by Michael Boelen.


   

Linux Security Expert - trainings, howtos, checklists, security tools, and more.


   The Grymoire - collection of useful incantations for wizards, be you computer wizards, magicians, or whatever.


   Secjuice - is the only non-profit, independent and volunteer led publication in the information security space.


   Decipher - security news that informs and inspires.





##### :black_small_square: Geeky Vendor Blogs





   Tenable Podcast - conversations and interviews related to Cyber Exposure, and more.


   Sophos - threat news room, giving you news, opinion, advice and research on computer security issues.


   Tripwire State of Security - blog featuring the latest news, trends and insights on current security issues.


   Malwarebytes Labs Blog - security blog aims to provide insider news about cybersecurity.


   TrustedSec - latest news, and trends about cybersecurity.


   PortSwigger Web Security Blog - about web app security vulns and top tips from our team of web security.


   AT&T Cybersecurity blog - news on emerging threats and practical advice to simplify threat detection.


   Thycotic - where CISOs and IT Admins come to learn about industry trends, IT security, and more.





##### :black_small_square: Geeky Cybersecurity Podcasts





   Risky Business - is a weekly information security podcast featuring news and in-depth interviews.


   Cyber, by Motherboard - stories, and focus on the ideas  about cybersecurity.


   Tenable Podcast - conversations and interviews related to Cyber Exposure, and more.


   

Cybercrime Investigations - podcast by Geoff White about cybercrimes.


   The many hats club - featuring stories from a wide range of Infosec people (Whitehat, Greyhat and Blackhat).


   Darknet Diaries - true stories from the dark side of the Internet.


   OSINTCurious Webcasts - is the investigative curiosity that helps people be successful in OSINT.


   Security Weekly - the latest information security and hacking news.





##### :black_small_square: Geeky Cybersecurity Video Blogs





   rev3rse security - offensive, binary exploitation, web app security, hardening, red team, blue team.


   LiveOverflow - a lot more advanced topics than what is typically offered in paid online courses - but for free.


   J4vv4D - the important information regarding our internet security.


   

CyberTalks - talks, interviews, and article about cybersecurity.





##### :black_small_square: Best Personal Twitter Accounts





   @blackroomsec - a white-hat hacker/pentester. Intergalactic Minesweeper Champion 1990.


   @MarcoCiappelli - Co-Founder @ITSPmagazine, at the intersection of IT security and society.


   @binitamshah - Linux Evangelist. Malwares. Kernel Dev. Security Enthusiast.


   @joe_carson - an InfoSec Professional and Tech Geek.


   @mikko - CRO at F-Secure, Reverse Engineer, TED Speaker, Supervillain.


   @esrtweet - often referred to as ESR, is an American software developer, and open-source software advocate.


   @gynvael - security researcher/programmer, @DragonSectorCTF founder/player, technical streamer.


   @x0rz - Security Researcher & Cyber Observer.


   @hasherezade - programmer, malware analyst. Author of PEbear, PEsieve, libPeConv.


   @TinkerSec - tinkerer, cypherpunk, hacker.


   @alisaesage - independent hacker and researcher.


   @SwiftOnSecurity - systems security, industrial safety, sysadmin, author of decentsecurity.com.


   @dakami - is one of just seven people with the authority to restore the DNS root keys.


   @samykamkar - is a famous "grey hat" hacker, security researcher, creator of the MySpace "Samy" worm.


   @securityweekly - founder & CTO of Security Weekly podcast network.


   @jack_daniel - @SecurityBSides co-founder.


   @thegrugq - Security Researcher.


   @matthew_d_green - a cryptographer and professor at Johns Hopkins University.





##### :black_small_square: Best Commercial Twitter Accounts





   @haveibeenpwned - check if you have an account that has been compromised in a data breach.


   @bugcrowd - trusted by more of the Fortune 500 than any other crowdsourced security platform.


   @Malwarebytes - most trusted security company. Unmatched threat visibility.


   @sansforensics - the world's leading Digital Forensics and Incident Response provider.


   @attcyber - AT&T Cybersecurity’s Edge-to-Edge technologies provide threat intelligence, and more.


   @TheManyHatsClub - an information security focused podcast and group of individuals from all walks of life.


   @hedgehogsec - Hedgehog Cyber. Gibraltar and Manchester's top boutique information security firm.


   @NCSC - the National Cyber Security Centre. Helping to make the UK the safest place to live and work online.


   @Synacktiv - IT security experts.





##### :black_small_square: A piece of history





   How to Do Things at ARL - how to configure modems, scan images, record CD-ROMs, and other.*





##### :black_small_square: Other





   Diffie-Hellman Key Exchange (short version) - how Diffie-Hellman Key Exchange worked.





#### Hacking/Penetration Testing  [[TOC]](#anger-table-of-contents)



##### :black_small_square: Pentesters arsenal tools





   Sandcat Browser - a penetration-oriented browser with plenty of advanced functionality already built in.


   Metasploit - tool and framework for pentesting system, web and many more.


   Burp Suite - tool for testing web app security, intercepting proxy to replay, inject, scan and fuzz.


   OWASP Zed Attack Proxy - intercepting proxy to replay, inject, scan and fuzz HTTP requests.


   w3af - is a Web Application Attack and Audit Framework.


   mitmproxy - an interactive TLS-capable intercepting HTTP proxy for penetration testers.


   Nikto2 - web server scanner which performs comprehensive tests against web servers for multiple items.


   sqlmap - tool that automates the process of detecting and exploiting SQL injection flaws.


   Recon-ng - is a full-featured Web Reconnaissance framework written in Python.


   AutoRecon - is a network reconnaissance tool which performs automated enumeration of services.


   Faraday - an Integrated Multiuser Pentest Environment.


   Photon - incredibly fast crawler designed for OSINT.


   XSStrike - most advanced XSS detection suite.


   Sn1per - automated pentest framework for offensive security experts.


   vuls - is an agent-less vulnerability scanner for Linux, FreeBSD, and other.


   tsunami - is a general purpose network security scanner with an extensible plugin system.


   aquatone - a tool for domain flyovers.


   BillCipher - information gathering tool for a website or IP address.


   WhatWaf - detect and bypass web application firewalls and protection systems.


   Corsy - CORS misconfiguration scanner.


   Raccoon - is a high performance offensive security tool for reconnaissance and vulnerability scanning.


   dirhunt - find web directories without bruteforce.


   John The Ripper - is a fast password cracker, currently available for many flavors of Unix, Windows, and other.


   hashcat - world's fastest and most advanced password recovery utility.


   p0f - is a tool to identify the players behind any incidental TCP/IP communications.


   ssh_scan - a prototype SSH configuration and policy scanner.


   LeakLooker - find open databases - powered by Binaryedge.io


   exploitdb - searchable archive from The Exploit Database.


   getsploit - is a command line utility for searching and downloading exploits.


   ctf-tools - some setup scripts for security research tools.


   pwntools - CTF framework and exploit development library.


   security-tools - collection of small security tools created mostly in Python. CTFs, pentests and so on.


   pentestpackage - is a package of Pentest scripts.


   python-pentest-tools - python tools for penetration testers.


   fuzzdb - dictionary of attack patterns and primitives for black-box application fault injection.


   AFL - is a free software fuzzer maintained by Google.


   AFL++ - is AFL with community patches.


   syzkaller - is an unsupervised, coverage-guided kernel fuzzer.


   pwndbg - exploit development and reverse engineering with GDB made easy.


   GDB PEDA - Python Exploit Development Assistance for GDB.


   IDA - multi-processor disassembler and debugger useful for reverse engineering malware.


   radare2 - framework for reverse-engineering and analyzing binaries.


   routersploit - exploitation framework for embedded devices.


   Ghidra - is a software reverse engineering (SRE) framework.


   Cutter - is an SRE platform integrating Ghidra's decompiler.


   Vulnreport - open-source pentesting management and automation platform by Salesforce Product Security.


   Mentalist - is a graphical tool for custom wordlist generation.


   archerysec - vulnerability assessment and management helps to perform scans and manage vulnerabilities.


   Osmedeus - fully automated offensive security tool for reconnaissance and vulnerability scanning.


   beef - the browser exploitation framework project.


   AutoSploit - automated mass exploiter.


   SUDO_KILLER - is a tool to identify and exploit sudo rules' misconfigurations and vulnerabilities.


   yara - the pattern matching swiss knife.


   mimikatz - a little tool to play with Windows security.


   sherlock - hunt down social media accounts by username across social networks.


   OWASP Threat Dragon - is a tool used to create threat model diagrams and to record possible threats.





##### :black_small_square: Pentests bookmarks collection





   PTES - the penetration testing execution standard.


   Pentests MindMap - amazing mind map with vulnerable apps and systems.


   WebApps Security Tests MindMap - incredible mind map for WebApps security tests.


   Brute XSS - master the art of Cross Site Scripting.


   XSS cheat sheet - contains many vectors that can help you bypass WAFs and filters.


   Offensive Security Bookmarks - security bookmarks collection, all things that author need to pass OSCP.


   Awesome Pentest Cheat Sheets - collection of the cheat sheets useful for pentesting.


   Awesome Hacking by HackWithGithub - awesome lists for hackers, pentesters and security researchers.


   Awesome Hacking by carpedm20 - a curated list of awesome hacking tutorials, tools and resources.


   Awesome Hacking Resources - collection of hacking/penetration testing resources to make you better.


   Awesome Pentest - collection of awesome penetration testing resources, tools and other shiny things.


   Awesome-Hacking-Tools - is a curated list of awesome Hacking Tools.


   Hacking Cheat Sheet - author hacking and pentesting notes.


   blackhat-arsenal-tools - official Black Hat arsenal security tools repository.


   Penetration Testing and WebApp Cheat Sheets - the complete list of Infosec related cheat sheets.


   Cyber Security Resources - includes thousands of cybersecurity-related references and resources.


   Pentest Bookmarks - there are a LOT of pentesting blogs.


   Cheatsheet-God - Penetration Testing Reference Bank - OSCP/PTP & PTX Cheatsheet.


   ThreatHunter-Playbook - to aid the development of techniques and hypothesis for hunting campaigns.


   Beginner-Network-Pentesting - notes for beginner network pentesting course.


   OSCPRepo - is a list of resources that author have been gathering in preparation for the OSCP.


   PayloadsAllTheThings - a list of useful payloads and bypass for Web Application Security and Pentest/CTF.


   payloads - git all the Payloads! A collection of web attack payloads.


   command-injection-payload-list - command injection payload list.


   Awesome Shodan Search Queries - great search queries to plug into Shodan.


   AwesomeXSS - is a collection of Awesome XSS resources.


   php-webshells - common php webshells.


   Pentesting Tools Cheat Sheet - a quick reference high level overview for typical penetration testing.


   OWASP Cheat Sheet Series - is a collection of high value information on specific application security topics.


   OWASP dependency-check - is an open source solution the OWASP Top 10 2013 entry.


   OWASP ProActive Controls - OWASP Top 10 Proactive Controls 2018.


   PENTESTING-BIBLE - hacking & penetration testing & red team & cyber security resources.


   pentest-wiki - is a free online security knowledge library for pentesters/researchers.


   DEF CON Media Server - great stuff from DEFCON.


   Awesome Malware Analysis - a curated list of awesome malware analysis tools and resources.


   SQL Injection Cheat Sheet - detailed technical stuff about the many different variants of the SQL Injection.


   Entersoft Knowledge Base - great and detailed reference about vulnerabilities.


   HTML5 Security Cheatsheet - a collection of HTML5 related XSS attack vectors.


   XSS String Encoder - for generating XSS code to check your input validation filters against XSS.


   GTFOBins - list of Unix binaries that can be exploited by an attacker to bypass local security restrictions.


   Guifre Ruiz Notes - collection of security, system, network and pentest cheatsheets.


   SSRF Tips - a collection of SSRF Tips.


   shell-storm repo CTF - great archive of CTFs.


   ctf - CTF (Capture The Flag) writeups, code snippets, notes, scripts.


   My-CTF-Web-Challenges - collection of CTF Web challenges.


   MSTG - The Mobile Security Testing Guide (MSTG) is a comprehensive manual for mobile app security testing.


   Internal-Pentest-Playbook - notes on the most common things for an Internal Network Penetration Test.


   KeyHacks - shows quick ways in which API keys leaked by a bug bounty program can be checked.


   securitum/research - various Proof of Concepts of security research performed by Securitum.


   public-pentesting-reports - is a list of public pentest reports released by several consulting security groups.


   awesome-bug-bounty - is a comprehensive curated list of available Bug Bounty.


   bug-bounty-reference - is a list of bug bounty write-ups.


   Awesome-Bugbounty-Writeups - is a curated list of bugbounty writeups.


   Bug bounty writeups - list of bug bounty writeups (2012-2020).


   hackso.me - a great journey into security.





##### :black_small_square: Backdoors/exploits





   PHP-backdoors - a collection of PHP backdoors. For educational or testing purposes only.





##### :black_small_square: Wordlists and Weak passwords





   Weakpass - for any kind of bruteforce find wordlists or unleash the power of them all at once!


   Hashes.org - is a free online hash resolving service incorporating many unparalleled techniques.


   SecLists - collection of multiple types of lists used during security assessments, collected in one place.


   Probable-Wordlists - sorted by probability originally created for password generation and testing.


   skullsecurity passwords - password dictionaries and leaked passwords repository.


   Polish PREMIUM Dictionary - official dictionary created by the team on the forum bezpieka.org.* 1


   statistically-likely-usernames - wordlists for creating statistically likely username lists.





##### :black_small_square: Bounty platforms





   YesWeHack - bug bounty platform with infosec jobs.


   Openbugbounty - allows any security researcher reporting a vulnerability on any website.


   hackerone - global hacker community to surface the most relevant security issues.


   bugcrowd - crowdsourced cybersecurity for the enterprise.


   Crowdshield - crowdsourced security & bug bounty management.


   Synack - crowdsourced security & bug bounty programs, crowd security intelligence platform, and more.


   Hacktrophy - bug bounty platform.





##### :black_small_square: Web Training Apps (local installation)





   OWASP-VWAD - comprehensive and well maintained registry of all known vulnerable web applications.


   DVWA - PHP/MySQL web application that is damn vulnerable.


   metasploitable2 - vulnerable web application amongst security researchers.


   metasploitable3 - is a VM that is built from the ground up with a large amount of security vulnerabilities.


   DSVW - is a deliberately vulnerable web application written in under 100 lines of code.


   OWASP Mutillidae II - free, open source, deliberately vulnerable web-application.


   OWASP Juice Shop Project - the most bug-free vulnerable application in existence.


   OWASP Node js Goat Project - OWASP Top 10 security risks apply to web apps developed using Node.js.


   juicy-ctf - run Capture the Flags and Security Trainings with OWASP Juice Shop.


   SecurityShepherd - web and mobile application security training platform.


   Security Ninjas - open source application security training program.


   hackazon - a modern vulnerable web app.


   dvna - damn vulnerable NodeJS application.


   django-DefectDojo - is an open-source application vulnerability correlation and security orchestration tool.


   Google Gruyere - web application exploits and defenses.


   Bodhi - is a playground focused on learning the exploitation of client-side web vulnerabilities.


   Websploit - single vm lab with the purpose of combining several vulnerable appliations in one environment.


   vulhub - pre-built Vulnerable Environments based on docker-compose.


   CloudGoat 2 - the new & improved "Vulnerable by Design"

AWS deployment tool.


   secDevLabs - is a laboratory for learning secure web development in a practical manner.


   CORS-vulnerable-Lab - sample vulnerable code and its exploit code.


   RootTheBox - a Game of Hackers (CTF Scoreboard & Game Manager).


   KONTRA - application security training (OWASP Top Web & Api).





##### :black_small_square: Labs (ethical hacking platforms/trainings/CTFs)





   Offensive Security - true performance-based penetration testing training for over a decade.


   Hack The Box - online platform allowing you to test your penetration testing skills.


   Hacking-Lab - online ethical hacking, computer network and security challenge platform.


   pwnable.kr - non-commercial wargame site which provides various pwn challenges.


   Pwnable.tw - is a wargame site for hackers to test and expand their binary exploiting skills.


   picoCTF - is a free computer security game targeted at middle and high school students.


   CTFlearn - is an online platform built to help ethical hackers learn and practice their cybersecurity knowledge.


   ctftime - CTF archive and a place, where you can get some another CTF-related info.


   Silesia Security Lab - high quality security testing services.


   Practical Pentest Labs - pentest lab, take your Hacking skills to the next level.


   Root Me - the fast, easy, and affordable way to train your hacking skills.


   rozwal.to - a great platform to train your pentesting skills.


   TryHackMe - learning Cyber Security made easy.


   hackxor - is a realistic web application hacking game, designed to help players of all abilities develop their skills.


   Hack Yourself First - it's full of nasty app sec holes.


   OverTheWire - can help you to learn and practice security concepts in the form of fun-filled games.


   Wizard Labs - is an online Penetration Testing Lab.


   PentesterLab - provides vulnerable systems that can be used to test and understand vulnerabilities.


   RingZer0 - tons of challenges designed to test and improve your hacking skills.


   try2hack - several security-oriented challenges for your entertainment.


   Ubeeri - preconfigured lab environments.


   Pentestit - emulate IT infrastructures of real companies for legal pen testing and improving pentest skills.


   Microcorruption - reversal challenges done in the web interface.


   Crackmes - download crackmes to help improve your reverse engineering skills.


   DomGoat - DOM XSS security learning and practicing platform.


   Stereotyped Challenges - upgrade your web hacking techniques today!


   Vulnhub - allows anyone to gain practical 'hands-on' experience in digital security.


   W3Challs - is a penetration testing training platform, which offers various computer challenges.


   RingZer0 CTF - offers you tons of challenges designed to test and improve your hacking skills.


   Hack.me - a platform where you can build, host and share vulnerable web apps for educational purposes.


   HackThis! - discover how hacks, dumps and defacements are performed and secure your website.


   Enigma Group WebApp Training - these challenges cover the exploits listed in the OWASP Top 10 Project.


   Reverse Engineering Challenges - challenges, exercises, problems and tasks - by level, by type, and more.


   0x00sec - the home of the Hacker - Malware, Reverse Engineering, and Computer Science.


   We Chall - there are exist a lots of different challenge types.


   Hacker Gateway - is the go-to place for hackers who want to test their skills.


   Hacker101 - is a free class for web security.


   contained.af - a stupid game for learning about containers, capabilities, and syscalls.


   flAWS challenge! - a series of levels you'll learn about common mistakes and gotchas when using AWS.


   CyberSec WTF - provides web hacking challenges derived from bounty write-ups.


   CTF Challenge - CTF Web App challenges.


   gCTF - most of the challenges used in the Google CTF 2017.


   Hack This Site - is a free, safe and legal training ground for hackers.


   Attack & Defense - is a browser-based cloud labs.


   Cryptohack - a fun platform for learning modern cryptography.


   Cryptopals - the cryptopals crypto challenges.





##### :black_small_square: CTF platforms





   fbctf - platform to host Capture the Flag competitions.


   ctfscoreboard - scoreboard for Capture The Flag competitions.





##### :black_small_square: Other resources





   Bugcrowd University - open source education content for the researcher community.


   OSCPRepo - a list of resources and scripts that I have been gathering in preparation for the OSCP.


   OWASP Top 10: Real-World Examples - test your web apps with real-world examples (two-part series).


   phrack.org - an awesome collection of articles from several respected hackers and other thinkers.


   Practical-Ethical-Hacking-Resources - compilation of resources from TCM's Udemy Course.





#### Your daily knowledge and news  [[TOC]](#anger-table-of-contents)



##### :black_small_square: RSS Readers





   Feedly - organize, read and share what matters to you.


   Inoreader - similar to feedly with a support for filtering what you fetch from rss.





##### :black_small_square: IRC Channels





   #hackerspaces - hackerspace IRC channels.





##### :black_small_square: Security





   The Hacker News - leading news source dedicated to promoting awareness for security experts and hackers.


   Latest Hacking News - provides the latest hacking news, exploits and vulnerabilities for ethical hackers.


   Security Newsletter - security news as a weekly digest (email notifications).


   Google Online Security Blog - the latest news and insights from Google on security and safety on the Internet.


   Qualys Blog - expert network security guidance and news.


   DARKReading - connecting the Information Security Community.


   Darknet - latest hacking tools, hacker news, cybersecurity best practices, ethical hacking & pen-testing.


   publiclyDisclosed - public disclosure watcher who keeps you up to date about the recently disclosed bugs.


   Reddit - Hacking - a subreddit dedicated to hacking and hackers.


   Packet Storm - information security services, news, files, tools, exploits, advisories and whitepapers.


   Sekurak - about security, penetration tests, vulnerabilities and many others (PL/EN).


   nf.sec - basic aspects and mechanisms of Linux operating system security (PL).





##### :black_small_square: Other/All-in-one





   Changelog - is a community of hackers; news & podcasts for developers and hackers.





#### Other Cheat Sheets  [[TOC]](#anger-table-of-contents)



###### Build your own DNS Servers





   Unbound DNS Tutorial - a validating, recursive, and caching DNS server.


   Knot Resolver on Fedora - how to get faster and more secure DNS resolution with Knot Resolver on Fedora.


   DNS-over-HTTPS - tutorial to setup your own DNS-over-HTTPS (DoH) server.


   dns-over-https - a cartoon intro to DNS over HTTPS.


   DNS-over-TLS - following to your DoH server, setup your DNS-over-TLS (DoT) server.


   DNS Servers - how (and why) i run my own DNS Servers.





###### Build your own Certificate Authority





   OpenSSL Certificate Authority - build your own certificate authority (CA) using the OpenSSL tools.


   step-ca Certificate Authority - build your own certificate authority (CA) using open source step-ca.





###### Build your own System/Virtual Machine





   os-tutorial - how to create an OS from scratch.


   Write your Own Virtual Machine - how to write your own virtual machine (VM).


   x86 Bare Metal Examples - dozens of minimal operating systems to learn x86 system programming.


   simple-computer - the scott CPU from "But How Do It Know?" by J. Clark Scott.


   littleosbook - the little book about OS development.





###### DNS Servers list (privacy)



| IP | URL |

| :---         | :---         |

| **`84.200.69.80`** | [dns.watch](https://dns.watch/) |

| **`94.247.43.254`** | [opennic.org](https://www.opennic.org/) |

| **`64.6.64.6`** | [verisign.com](https://www.verisign.com/en_US/security-services/public-dns/index.xhtml) |

| **`89.233.43.71`** | [censurfridns.dk](https://blog.uncensoreddns.org/) |

| **`1.1.1.1`** | [cloudflare.com](https://1.1.1.1/) |

| **`94.130.110.185`** | [dnsprivacy.at](https://dnsprivacy.at/) |



###### TOP Browser extensions



| Extension name | Description |

| :---         | :---         |

| **`IPvFoo`** | Display the server IP address and HTTPS information across all page elements. |

| **`FoxyProxy`** | Simplifies configuring browsers to access proxy-servers. |

| **`HTTPS Everywhere`** | Automatically use HTTPS security on many sites. |

| **`uMatrix`** | Point & click to forbid/allow any class of requests made by your browser. |

| **`uBlock Origin`** | An efficient blocker: easy on memory and CPU footprint. |

| **`Session Buddy`** | Manage browser tabs and bookmarks with ease. |

| **`SuperSorter`** | Sort bookmarks recursively, delete duplicates, merge folders, and more. |

| **`Clear Cache`** | Clear your cache and browsing data. |

| **`d3coder`** | Encoding/Decoding plugin for various types of encoding. |

| **`Web Developer`** | Adds a toolbar button with various web developer tools. |

| **`ThreatPinch Lookup`** | Add threat intelligence hover tool tips. |



###### TOP Burp extensions



| Extension name | Description |

| :---         | :---         |

| **`Active Scan++`** | Extends Burp's active and passive scanning capabilities. |

| **`Autorize`** | Automatically detects authorization enforcement. |

| **`AuthMatrix`** | A simple matrix grid to define the desired levels of access privilege. |

| **`Logger++`** | Logs requests and responses for all Burp tools in a sortable table. |

| **`Bypass WAF`** | Adds headers useful for bypassing some WAF devices. |

| **`JSON Beautifier`** | Beautifies JSON content in the HTTP message viewer. |

| **`JSON Web Tokens`** | Enables Burp to decode and manipulate JSON web tokens. |

| **`CSP Auditor`** | Displays CSP headers for responses, and passively reports CSP weaknesses. |

| **`CSP-Bypass`** | Passively scans for CSP headers that contain known bypasses. |

| **`Hackvertor`** | Converts data using a tag-based configuration to apply various encoding. |

| **`HTML5 Auditor`** | Scans for usage of risky HTML5 features. |

| **`Software Vulnerability Scanner`** | Vulnerability scanner based on vulners.com audit API. |

| **`Turbo Intruder`** | Is a powerful bruteforcing tool. |

| **`Upload Scanner`** | Upload a number of different file types, laced with different forms of payload. |



###### Hack Mozilla Firefox address bar



In Firefox's address bar, you can limit results by typing special characters before or after your term:



- `^` - for matches in your browsing history

- `*` - for matches in your bookmarks.

- `%` - for matches in your currently open tabs.

- `#` - for matches in page titles.

- `@` - for matches in web addresses.



###### Chrome hidden commands



- `chrome://chrome-urls` - list of all commands

- `chrome://flags` - enable experiments and development features

- `chrome://interstitials` - errors and warnings

- `chrome://net-internals` - network internals (events, dns, cache)

- `chrome://network-errors` - network errors

- `chrome://net-export` - start logging future network activity to a file

- `chrome://safe-browsing` - safe browsing options

- `chrome://user-actions` - record all user actions

- `chrome://restart` - restart chrome

- `chrome://dino` - ERR_INTERNET_DISCONNECTED...

- `cache:` - view the cached version of the web page



###### Bypass WAFs by Shortening IP Address (by [0xInfection](https://twitter.com/0xInfection))



IP addresses can be shortened by dropping the zeroes:



```

http://1.0.0.1 → http://1.1

http://127.0.0.1 → http://127.1

http://192.168.0.1 → http://192.168.1



http://0xC0A80001 or http://3232235521 → 192.168.0.1

http://192.168.257 → 192.168.1.1

http://192.168.516 → 192.168.2.4

```



  > This bypasses WAF filters for SSRF, open-redirect, etc where any IP as input gets blacklisted.



For more information please see [How to Obscure Any URL](http://www.pc-help.org/obscure.htm) and [Magic IP Address Shortcuts](https://stuff-things.net/2014/09/25/magic-ip-address-shortcuts/).



###### Hashing, encryption and encoding (by [Michal Špaček](https://twitter.com/spazef0rze))



_Hashing_



plaintext :arrow_right: hash


hash :no_entry: plaintext



_Symmetric encryption_



plaintext :arrow_right: :key: :arrow_right: ciphertext


plaintext :arrow_left: :key: :arrow_left: ciphertext


(:key: shared key)



_Asymmetric encryption_



plaintext :arrow_right: :key: :arrow_right: ciphertext


plaintext :arrow_left: :part_alternation_mark: :arrow_left: ciphertext


(:key: public key, :part_alternation_mark: private key)



_Encoding_



text :arrow_right: encoded


text :arrow_left: encoded



#### Shell One-liners  [[TOC]](#anger-table-of-contents)



##### Table of Contents



  * [terminal](#tool-terminal)

  * [busybox](#tool-busybox)

  * [mount](#tool-mount)

  * [fuser](#tool-fuser)

  * [lsof](#tool-lsof)

  * [ps](#tool-ps)

  * [top](#tool-top)

  * [vmstat](#tool-vmstat)

  * [iostat](#tool-iostat)

  * [strace](#tool-strace)

  * [kill](#tool-kill)

  * [find](#tool-find)

  * [diff](#tool-diff)

  * [vimdiff](#tool-vimdiff)

  * [tail](#tool-tail)

  * [cpulimit](#tool-cpulimit)

  * [pwdx](#tool-pwdx)

  * [tr](#tool-tr)

  * [chmod](#tool-chmod)

  * [who](#tool-who)

  * [last](#tool-last)

  * [screen](#tool-screen)

  * [script](#tool-script)

  * [du](#tool-du)

  * [inotifywait](#tool-inotifywait)

  * [openssl](#tool-openssl)

  * [secure-delete](#tool-secure-delete)

  * [dd](#tool-dd)

  * [gpg](#tool-gpg)

  * [system-other](#tool-system-other)

  * [curl](#tool-curl)

  * [httpie](#tool-httpie)

  * [ssh](#tool-ssh)

  * [linux-dev](#tool-linux-dev)

  * [tcpdump](#tool-tcpdump)

  * [tcpick](#tool-tcpick)

  * [ngrep](#tool-ngrep)

  * [hping3](#tool-hping3)

  * [nmap](#tool-nmap)

  * [netcat](#tool-netcat)

  * [socat](#tool-socat)

  * [p0f](#tool-p0f)

  * [gnutls-cli](#tool-gnutls-cli)

  * [netstat](#tool-netstat)

  * [rsync](#tool-rsync)

  * [host](#tool-host)

  * [dig](#tool-dig)

  * [certbot](#tool-certbot)

  * [network-other](#tool-network-other)

  * [git](#tool-git)

  * [awk](#tool-awk)

  * [sed](#tool-sed)

  * [grep](#tool-grep)

  * [perl](#tool-perl)



##### Tool: [terminal](https://en.wikipedia.org/wiki/Linux_console)



###### Reload shell without exit



```bash

exec $SHELL -l

```



###### Close shell keeping all subprocess running



```bash

disown -a && exit

```



###### Exit without saving shell history



```bash

kill -9 $$

unset HISTFILE && exit

```



###### Perform a branching conditional



```bash

true && echo success

false || echo failed

```



###### Pipe stdout and stderr to separate commands



```bash

some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr)

```



###### Redirect stdout and stderr each to separate files and print both to the screen



```bash

(some_command 2>&1 1>&3 | tee errorlog ) 3>&1 1>&2 | tee stdoutlog

```



###### List of commands you use most often



```bash

history | \

awk '{CMD[$2]++;count++;}END { for (a in CMD)print CMD[a] " " CMD[a]/count*100 "% " a;}' | \

grep -v "./" | \

column -c3 -s " " -t | \

sort -nr | nl |  head -n 20

```



###### Sterilize bash history



```bash

function sterile() {



  history | awk '$2 != "history" { $1=""; print $0 }' | egrep -vi "\

curl\b+.*(-E|--cert)\b+.*\b*|\

curl\b+.*--pass\b+.*\b*|\

curl\b+.*(-U|--proxy-user).*:.*\b*|\

curl\b+.*(-u|--user).*:.*\b*

.*(-H|--header).*(token|auth.*)\b+.*|\

wget\b+.*--.*password\b+.*\b*|\

http.?://.+:.+@.*\

" > $HOME/histbuff; history -r $HOME/histbuff;



}



export PROMPT_COMMAND="sterile"

```



  > Look also: [A naive utility to censor credentials in command history](https://github.com/lbonanomi/go/blob/master/revisionist.go).



###### Quickly backup a file



```bash

cp filename{,.orig}

```



###### Empty a file (truncate to 0 size)



```bash

>filename

```



###### Delete all files in a folder that don't match a certain file extension



```bash

rm !(*.foo|*.bar|*.baz)

```



###### Pass multi-line string to a file



```bash

# cat  >filename ... - overwrite the file

# cat >>filename ... - append to a file

cat > filename << __EOF__

data data data

__EOF__

```



###### Edit a file on a remote host using vim



```bash

vim scp://user@host//etc/fstab

```



###### Create a directory and change into it at the same time



```bash

mkd() { mkdir -p "$@" && cd "$@"; }

```



###### Convert uppercase files to lowercase files



```bash

rename 'y/A-Z/a-z/' *

```



###### Print a row of characters across the terminal



```bash

printf "%`tput cols`s" | tr ' ' '#'

```



###### Show shell history without line numbers



```bash

history | cut -c 8-

fc -l -n 1 | sed 's/^\s*//'

```



###### Run command(s) after exit session



```bash

cat > /etc/profile << __EOF__

_after_logout() {



  username=$(whoami)



  for _pid in $(ps afx | grep sshd | grep "$username" | awk '{print $1}') ; do



    kill -9 $_pid



  done



}

trap _after_logout EXIT

__EOF__

```



###### Generate a sequence of numbers



```bash

for ((i=1; i<=10; i+=2)) ; do echo $i ; done

# alternative: seq 1 2 10



for ((i=5; i<=10; ++i)) ; do printf '%02d\n' $i ; done

# alternative: seq -w 5 10



for i in {1..10} ; do echo $i ; done

```



###### Simple Bash filewatching



```bash

unset MAIL; export MAILCHECK=1; export MAILPATH='$FILE_TO_WATCH?$MESSAGE'

```



---



##### Tool: [busybox](https://www.busybox.net/)



###### Static HTTP web server



```bash

busybox httpd -p $PORT -h $HOME [-c httpd.conf]

```



___



##### Tool: [mount](https://en.wikipedia.org/wiki/Mount_(Unix))



###### Mount a temporary ram partition



```bash

mount -t tmpfs tmpfs /mnt -o size=64M

```



  * `-t` - filesystem type

  * `-o` - mount options



###### Remount a filesystem as read/write



```bash

mount -o remount,rw /

```



___



##### Tool: [fuser](https://en.wikipedia.org/wiki/Fuser_(Unix))



###### Show which processes use the files/directories



```bash

fuser /var/log/daemon.log

fuser -v /home/supervisor

```



###### Kills a process that is locking a file



```bash

fuser -ki filename

```



  * `-i` - interactive option



###### Kills a process that is locking a file with specific signal



```bash

fuser -k -HUP filename

```



  * `--list-signals` - list available signal names



###### Show what PID is listening on specific port



```bash

fuser -v 53/udp

```



###### Show all processes using the named filesystems or block device



```bash

fuser -mv /var/www

```



___



##### Tool: [lsof](https://en.wikipedia.org/wiki/Lsof)



###### Show process that use internet connection at the moment



```bash

lsof -P -i -n

```



###### Show process that use specific port number



```bash

lsof -i tcp:443

```



###### Lists all listening ports together with the PID of the associated process



```bash

lsof -Pan -i tcp -i udp

```



###### List all open ports and their owning executables



```bash

lsof -i -P | grep -i "listen"

```



###### Show all open ports



```bash

lsof -Pnl -i

```



###### Show open ports (LISTEN)



```bash

lsof -Pni4 | grep LISTEN | column -t

```



###### List all files opened by a particular command



```bash

lsof -c "process"

```



###### View user activity per directory



```bash

lsof -u username -a +D /etc

```



###### Show 10 largest open files



```bash

lsof / | \

awk '{ if($7 > 1048576) print $7/1048576 "MB" " " $9 " " $1 }' | \

sort -n -u | tail | column -t

```



###### Show current working directory of a process



```bash

lsof -p  | grep cwd

```



___



##### Tool: [ps](https://en.wikipedia.org/wiki/Ps_(Unix))



###### Show a 4-way scrollable process tree with full details



```bash

ps awwfux | less -S

```



###### Processes per user counter



```bash

ps hax -o user | sort | uniq -c | sort -r

```



###### Show all processes by name with main header



```bash

ps -lfC nginx

```



___



##### Tool: [find](https://en.wikipedia.org/wiki/Find_(Unix))



###### Find files that have been modified on your system in the past 60 minutes



```bash

find / -mmin 60 -type f

```



###### Find all files larger than 20M



```bash

find / -type f -size +20M

```



###### Find duplicate files (based on MD5 hash)



```bash

find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33

```



###### Change permission only for files



```bash

cd /var/www/site && find . -type f -exec chmod 766 {} \;

cd /var/www/site && find . -type f -exec chmod 664 {} +

```



###### Change permission only for directories



```bash

cd /var/www/site && find . -type d -exec chmod g+x {} \;

cd /var/www/site && find . -type d -exec chmod g+rwx {} +

```



###### Find files and directories for specific user/group



```bash

# User:

find . -user  -print

find /etc -type f -user  -name "*.conf"



# Group:

find /opt -group 

find /etc -type f -group  -iname "*.conf"

```



###### Find files and directories for all without specific user/group



```bash

# User:

find . \! -user  -print



# Group:

find . \! -group 

```



###### Looking for files/directories that only have certain permission



```bash

# User

find . -user  -perm -u+rw # -rw-r--r--

find /home -user $(whoami) -perm 777 # -rwxrwxrwx



# Group:

find /home -type d -group  -perm 755 # -rwxr-xr-x

```



###### Delete older files than 60 days



```bash

find . -type f -mtime +60 -delete

```



###### Recursively remove all empty sub-directories from a directory



```bash

find . -depth  -type d  -empty -exec rmdir {} \;

```



###### How to find all hard links to a file



```bash

find  -xdev -samefile filename

```



###### Recursively find the latest modified files



```bash

find . -type f -exec stat --format '%Y :%y %n' "{}" \; | sort -nr | cut -d: -f2- | head

```



###### Recursively find/replace of a string with sed



```bash

find . -not -path '*/\.git*' -type f -print0 | xargs -0 sed -i 's/foo/bar/g'

```



###### Recursively find/replace of a string in directories and file names



```bash

find . -depth -name '*test*' -execdir bash -c 'mv -v "$1" "${1//foo/bar}"' _ {} \;

```



###### Recursively find suid executables



```bash

find / \( -perm -4000 -o -perm -2000 \) -type f -exec ls -la {} \;

```



___



##### Tool: [top](https://en.wikipedia.org/wiki/Top_(software))



###### Use top to monitor only all processes with the specific string



```bash

top -p $(pgrep -d , )

```



  * `` - process containing string (eg. nginx, worker)



___



##### Tool: [vmstat](https://en.wikipedia.org/wiki/Vmstat)



###### Show current system utilization (fields in kilobytes)



```bash

vmstat 2 20 -t -w

```



  * `2` - number of times with a defined time interval (delay)

  * `20` - each execution of the command (count)

  * `-t` - show timestamp

  * `-w` - wide output

  * `-S M` - output of the fields in megabytes instead of kilobytes



###### Show current system utilization will get refreshed every 5 seconds



```bash

vmstat 5 -w

```



###### Display report a summary of disk operations



```bash

vmstat -D

```



###### Display report of event counters and memory stats



```bash

vmstat -s

```



###### Display report about kernel objects stored in slab layer cache



```bash

vmstat -m

```



##### Tool: [iostat](https://en.wikipedia.org/wiki/Iostat)



###### Show information about the CPU usage, and I/O statistics about all the partitions



```bash

iostat 2 10 -t -m

```



  * `2` - number of times with a defined time interval (delay)

  * `10` - each execution of the command (count)

  * `-t` - show timestamp

  * `-m` - fields in megabytes (`-k` - in kilobytes, default)



###### Show information only about the CPU utilization



```bash

iostat 2 10 -t -m -c

```



###### Show information only about the disk utilization



```bash

iostat 2 10 -t -m -d

```



###### Show information only about the LVM utilization



```bash

iostat -N

```



___



##### Tool: [strace](https://en.wikipedia.org/wiki/Strace)



###### Track with child processes



```bash

# 1)

strace -f -p $(pidof glusterfsd)



# 2)

strace -f $(pidof php-fpm | sed 's/\([0-9]*\)/\-p \1/g')

```



###### Track process with 30 seconds limit



```bash

timeout 30 strace $(< /var/run/zabbix/zabbix_agentd.pid)

```



###### Track processes and redirect output to a file



```bash

ps auxw | grep '[a]pache' | awk '{print " -p " $2}' | \

xargs strace -o /tmp/strace-apache-proc.out

```



###### Track with print time spent in each syscall and limit length of print strings



```bash

ps auxw | grep '[i]init_policy' | awk '{print " -p " $2}' | \

xargs strace -f -e trace=network -T -s 10000

```



###### Track the open request of a network port



```bash

strace -f -e trace=bind nc -l 80

```



###### Track the open request of a network port (show TCP/UDP)



```bash

strace -f -e trace=network nc -lu 80

```



___



##### Tool: [kill](https://en.wikipedia.org/wiki/Kill_(command))



###### Kill a process running on port



```bash

kill -9 $(lsof -i : | awk '{l=$2} END {print l}')

```



___



##### Tool: [diff](https://en.wikipedia.org/wiki/Diff)



###### Compare two directory trees



```bash

diff <(cd directory1 && find | sort) <(cd directory2 && find | sort)

```



###### Compare output of two commands



```bash

diff <(cat /etc/passwd) <(cut -f2 /etc/passwd)

```



___



##### Tool: [vimdiff](http://vimdoc.sourceforge.net/htmldoc/diff.html)



###### Highlight the exact differences, based on characters and words



```bash

vimdiff file1 file2

```



###### Compare two JSON files



```bash

vimdiff <(jq -S . A.json) <(jq -S . B.json)

```



###### Compare Hex dump



```bash

d(){ vimdiff <(f $1) <(f $2);};f(){ hexdump -C $1 | cut -d' ' -f3- | tr -s ' ';}; d ~/bin1 ~/bin2

```



###### diffchar



Save [diffchar](https://raw.githubusercontent.com/vim-scripts/diffchar.vim/master/plugin/diffchar.vim) @ `~/.vim/plugins`



Click `F7` to switch between diff modes



Usefull `vimdiff` commands:



* `qa` to exit all windows

* `:vertical resize 70` to resize window

* set window width `Ctrl+W [N columns]+(Shift+)<\>`



___



##### Tool: [tail](https://en.wikipedia.org/wiki/Tail_(Unix))



###### Annotate tail -f with timestamps



```bash

tail -f file | while read ; do echo "$(date +%T.%N) $REPLY" ; done

```



###### Analyse an Apache access log for the most common IP addresses



```bash

tail -10000 access_log | awk '{print $1}' | sort | uniq -c | sort -n | tail

```



###### Analyse web server log and show only 5xx http codes



```bash

tail -n 100 -f /path/to/logfile | grep "HTTP/[1-2].[0-1]\" [5]"

```



___



##### Tool: [tar](https://en.wikipedia.org/wiki/Tar_(computing))



###### System backup with exclude specific directories



```bash

cd /

tar -czvpf /mnt/system$(date +%d%m%Y%s).tgz --directory=/ \

--exclude=proc/* --exclude=sys/* --exclude=dev/* --exclude=mnt/* .

```



###### System backup with exclude specific directories (pigz)



```bash

cd /

tar cvpf /backup/snapshot-$(date +%d%m%Y%s).tgz --directory=/ \

--exclude=proc/* --exclude=sys/* --exclude=dev/* \

--exclude=mnt/* --exclude=tmp/* --use-compress-program=pigz .

```



___



##### Tool: [dump](https://en.wikipedia.org/wiki/Dump_(program))



###### System backup to file



```bash

dump -y -u -f /backup/system$(date +%d%m%Y%s).lzo /

```



###### Restore system from lzo file



```bash

cd /

restore -rf /backup/system$(date +%d%m%Y%s).lzo

```



___



##### Tool: [cpulimit](http://cpulimit.sourceforge.net/)



###### Limit the cpu usage of a process



```bash

cpulimit -p pid -l 50

```



___



##### Tool: [pwdx](https://www.cyberciti.biz/faq/unix-linux-pwdx-command-examples-usage-syntax/)



###### Show current working directory of a process



```bash

pwdx 

```



___



##### Tool: [taskset](https://www.cyberciti.biz/faq/taskset-cpu-affinity-command/)



###### Start a command on only one CPU core



```bash

taskset -c 0 

```



___



##### Tool: [tr](https://en.wikipedia.org/wiki/Tr_(Unix))



###### Show directories in the PATH, one per line



```bash

tr : '\n' <<<$PATH

```



___



##### Tool: [chmod](https://en.wikipedia.org/wiki/Chmod)



###### Remove executable bit from all files in the current directory



```bash

chmod -R -x+X *

```



###### Restore permission for /bin/chmod



```bash

# 1:

cp /bin/ls chmod.01

cp /bin/chmod chmod.01

./chmod.01 700 file



# 2:

/bin/busybox chmod 0700 /bin/chmod



# 3:

setfacl --set u::rwx,g::---,o::--- /bin/chmod

```



___



##### Tool: [who](https://en.wikipedia.org/wiki/Who_(Unix))



###### Find last reboot time



```bash

who -b

```



###### Detect a user sudo-su'd into the current shell



```bash

[[ $(who -m | awk '{ print $1 }') == $(whoami) ]] || echo "You are su-ed to $(whoami)"

```



___



##### Tool: [last](https://www.howtoforge.com/linux-last-command/)



###### Was the last reboot a panic?



```bash

(last -x -f $(ls -1t /var/log/wtmp* | head -2 | tail -1); last -x -f /var/log/wtmp) | \

grep -A1 reboot | head -2 | grep -q shutdown && echo "Expected reboot" || echo "Panic reboot"

```



___



##### Tool: [screen](https://en.wikipedia.org/wiki/GNU_Screen)



###### Start screen in detached mode



```bash

screen -d -m 

```



###### Attach to an existing screen session



```bash

screen -r -d 

```



___



##### Tool: [script](https://en.wikipedia.org/wiki/Script_(Unix))



###### Record and replay terminal session



```bash

### Record session

# 1)

script -t 2>~/session.time -a ~/session.log



# 2)

script --timing=session.time session.log



### Replay session

scriptreplay --timing=session.time session.log

```



___



##### Tool: [du](https://en.wikipedia.org/wiki/GNU_Screen)



###### Show 20 biggest directories with 'K M G'



```bash

du | \

sort -r -n | \

awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' | \

head -n 20

```



___



##### Tool: [inotifywait](https://en.wikipedia.org/wiki/GNU_Screen)



###### Init tool everytime a file in a directory is modified



```bash

while true ; do inotifywait -r -e MODIFY dir/ && ls dir/ ; done;

```



___



##### Tool: [openssl](https://www.openssl.org/)



###### Testing connection to the remote host



```bash

echo | openssl s_client -connect google.com:443 -showcerts

```



###### Testing connection to the remote host (debug mode)



```bash

echo | openssl s_client -connect google.com:443 -showcerts -tlsextdebug -status

```



###### Testing connection to the remote host (with SNI support)



```bash

echo | openssl s_client -showcerts -servername google.com -connect google.com:443

```



###### Testing connection to the remote host with specific ssl version



```bash

openssl s_client -tls1_2 -connect google.com:443

```



###### Testing connection to the remote host with specific ssl cipher



```bash

openssl s_client -cipher 'AES128-SHA' -connect google.com:443

```



###### Verify 0-RTT



```bash

_host="example.com"



cat > req.in << __EOF__

HEAD / HTTP/1.1

Host: $_host

Connection: close

__EOF__



openssl s_client -connect ${_host}:443 -tls1_3 -sess_out session.pem -ign_eof < req.in

openssl s_client -connect ${_host}:443 -tls1_3 -sess_in session.pem -early_data req.in

```



###### Generate private key without passphrase



```bash

# _len: 2048, 4096

( _fd="private.key" ; _len="2048" ; \

openssl genrsa -out ${_fd} ${_len} )

```



###### Generate private key with passphrase



```bash

# _ciph: aes128, aes256

# _len: 2048, 4096

( _ciph="aes128" ; _fd="private.key" ; _len="2048" ; \

openssl genrsa -${_ciph} -out ${_fd} ${_len} )

```



###### Remove passphrase from private key



```bash

( _fd="private.key" ; _fd_unp="private_unp.key" ; \

openssl rsa -in ${_fd} -out ${_fd_unp} )

```



###### Encrypt existing private key with a passphrase



```bash

# _ciph: aes128, aes256

( _ciph="aes128" ; _fd="private.key" ; _fd_pass="private_pass.key" ; \

openssl rsa -${_ciph} -in ${_fd} -out ${_fd_pass}

```



###### Check private key



```bash

( _fd="private.key" ; \

openssl rsa -check -in ${_fd} )

```



###### Get public key from private key



```bash

( _fd="private.key" ; _fd_pub="public.key" ; \

openssl rsa -pubout -in ${_fd} -out ${_fd_pub} )

```



###### Generate private key and CSR



```bash

( _fd="private.key" ; _fd_csr="request.csr" ; _len="2048" ; \

openssl req -out ${_fd_csr} -new -newkey rsa:${_len} -nodes -keyout ${_fd} )

```



###### Generate CSR



```bash

( _fd="private.key" ; _fd_csr="request.csr" ; \

openssl req -out ${_fd_csr} -new -key ${_fd} )

```



###### Generate CSR (metadata from existing certificate)



  > Where `private.key` is the existing private key. As you can see you do not generate this CSR from your certificate (public key). Also you do not generate the "same" CSR, just a new one to request a new certificate.



```bash

( _fd="private.key" ; _fd_csr="request.csr" ; _fd_crt="cert.crt" ; \

openssl x509 -x509toreq -in ${_fd_crt} -out ${_fd_csr} -signkey ${_fd} )

```



###### Generate CSR with -config param



```bash

( _fd="private.key" ; _fd_csr="request.csr" ; \

openssl req -new -sha256 -key ${_fd} -out ${_fd_csr} \

-config <(

cat << __EOF__

[req]

default_bits        = 2048

default_md          = sha256

prompt              = no

distinguished_name  = dn

req_extensions      = req_ext



[ dn ]

C   = ""

ST  = ""

L   = ""

O   = ""

OU  = ""

CN  = ""



[ req_ext ]

subjectAltName = @alt_names



[ alt_names ]

DNS.1 = 

DNS.2 = 

DNS.3 = 

__EOF__

))

```



Other values in `[ dn ]`:



```

countryName            = "DE"                     # C=

stateOrProvinceName    = "Hessen"                 # ST=

localityName           = "Keller"                 # L=

postalCode             = "424242"                 # L/postalcode=

postalAddress          = "Keller"                 # L/postaladdress=

streetAddress          = "Crater 1621"            # L/street=

organizationName       = "apfelboymschule"        # O=

organizationalUnitName = "IT Department"          # OU=

commonName             = "example.com"            # CN=

emailAddress           = "[email protected]"  # CN/emailAddress=

```



Example of `oids` (you'll probably also have to make OpenSSL know about the new fields required for EV by adding the following under `[new_oids]`):



```

[req]

...

oid_section         = new_oids



[ new_oids ]

postalCode = 2.5.4.17

streetAddress = 2.5.4.9

```



Full example:



```bash

( _fd="private.key" ; _fd_csr="request.csr" ; \

openssl req -new -sha256 -key ${_fd} -out ${_fd_csr} \

-config <(

cat << __EOF__

[req]

default_bits        = 2048

default_md          = sha256

prompt              = no

distinguished_name  = dn

req_extensions      = req_ext

oid_section         = new_oids



[ new_oids ]

serialNumber = 2.5.4.5

streetAddress = 2.5.4.9

postalCode = 2.5.4.17

businessCategory = 2.5.4.15



[ dn ]

serialNumber=00001111

businessCategory=Private Organization

jurisdictionC=DE

C=DE

ST=Hessen

L=Keller

postalCode=424242

streetAddress=Crater 1621

O=AV Company

OU=IT

CN=example.com



[ req_ext ]

subjectAltName = @alt_names



[ alt_names ]

DNS.1 = example.com

__EOF__

))

```



For more information please look at these great explanations:



- [RFC 5280](https://tools.ietf.org/html/rfc5280)

- [How to create multidomain certificates using config files](https://apfelboymchen.net/gnu/notes/openssl%20multidomain%20with%20config%20files.html)

- [Generate a multi domains certificate using config files](https://gist.github.com/romainnorberg/464758a6620228b977212a3cf20c3e08)

- [Your OpenSSL CSR command is out of date](https://expeditedsecurity.com/blog/openssl-csr-command/)

- [OpenSSL example configuration file](https://www.tbs-certificats.com/openssl-dem-server-cert.cnf)

- [Object Identifiers (OIDs)](https://www.alvestrand.no/objectid/)

- [openssl objects.txt](https://github.com/openssl/openssl/blob/master/crypto/objects/objects.txt)



###### List available EC curves



```bash

openssl ecparam -list_curves

```



###### Print ECDSA private and public keys



```bash

( _fd="private.key" ; \

openssl ec -in ${_fd} -noout -text )



# For x25519 only extracting public key

( _fd="private.key" ; _fd_pub="public.key" ; \

openssl pkey -in ${_fd} -pubout -out ${_fd_pub} )

```



###### Generate ECDSA private key



```bash

# _curve: prime256v1, secp521r1, secp384r1

( _fd="private.key" ; _curve="prime256v1" ; \

openssl ecparam -out ${_fd} -name ${_curve} -genkey )



# _curve: X25519

( _fd="private.key" ; _curve="x25519" ; \

openssl genpkey -algorithm ${_curve} -out ${_fd} )

```



###### Generate private key and CSR (ECC)



```bash

# _curve: prime256v1, secp521r1, secp384r1

( _fd="domain.com.key" ; _fd_csr="domain.com.csr" ; _curve="prime256v1" ; \

openssl ecparam -out ${_fd} -name ${_curve} -genkey ; \

openssl req -new -key ${_fd} -out ${_fd_csr} -sha256 )

```



###### Generate self-signed certificate



```bash

# _len: 2048, 4096

( _fd="domain.key" ; _fd_out="domain.crt" ; _len="2048" ; _days="365" ; \

openssl req -newkey rsa:${_len} -nodes \

-keyout ${_fd} -x509 -days ${_days} -out ${_fd_out} )

```



###### Generate self-signed certificate from existing private key



```bash

# _len: 2048, 4096

( _fd="domain.key" ; _fd_out="domain.crt" ; _days="365" ; \

openssl req -key ${_fd} -nodes \

-x509 -days ${_days} -out ${_fd_out} )

```



###### Generate self-signed certificate from existing private key and csr



```bash

# _len: 2048, 4096

( _fd="domain.key" ; _fd_csr="domain.csr" ; _fd_out="domain.crt" ; _days="365" ; \

openssl x509 -signkey ${_fd} -nodes \

-in ${_fd_csr} -req -days ${_days} -out ${_fd_out} )

```



###### Generate DH public parameters



```bash

( _dh_size="2048" ; \

openssl dhparam -out /etc/nginx/ssl/dhparam_${_dh_size}.pem "$_dh_size" )

```



###### Display DH public parameters



```bash

openssl pkeyparam -in dhparam.pem -text

```



###### Extract private key from pfx



```bash

( _fd_pfx="cert.pfx" ; _fd_key="key.pem" ; \

openssl pkcs12 -in ${_fd_pfx} -nocerts -nodes -out ${_fd_key} )

```



###### Extract private key and certs from pfx



```bash

( _fd_pfx="cert.pfx" ; _fd_pem="key_certs.pem" ; \

openssl pkcs12 -in ${_fd_pfx} -nodes -out ${_fd_pem} )

```



###### Extract certs from p7b



```bash

# PKCS#7 file doesn't include private keys.

( _fd_p7b="cert.p7b" ; _fd_pem="cert.pem" ; \

openssl pkcs7 -inform DER -outform PEM -in ${_fd_p7b} -print_certs > ${_fd_pem})

# or:

openssl pkcs7 -print_certs -in -in ${_fd_p7b} -out ${_fd_pem})

```



###### Convert DER to PEM



```bash

( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \

openssl x509 -in ${_fd_der} -inform der -outform pem -out ${_fd_pem} )

```



###### Convert PEM to DER



```bash

( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \

openssl x509 -in ${_fd_pem} -outform der -out ${_fd_der} )

```



###### Verification of the private key



```bash

( _fd="private.key" ; \

openssl rsa -noout -text -in ${_fd} )

```



###### Verification of the public key



```bash

# 1)

( _fd="public.key" ; \

openssl pkey -noout -text -pubin -in ${_fd} )



# 2)

( _fd="private.key" ; \

openssl rsa -inform PEM -noout -in ${_fd} &> /dev/null ; \

if [ $? = 0 ] ; then echo -en "OK\n" ; fi )

```



###### Verification of the certificate



```bash

( _fd="certificate.crt" ; # format: pem, cer, crt \

openssl x509 -noout -text -in ${_fd} )

```



###### Verification of the CSR



```bash

( _fd_csr="request.csr" ; \

openssl req -text -noout -in ${_fd_csr} )

```



###### Check the private key and the certificate are match



```bash

(openssl rsa -noout -modulus -in private.key | openssl md5 ; \

openssl x509 -noout -modulus -in certificate.crt | openssl md5) | uniq

```



###### Check the private key and the CSR are match



```bash

(openssl rsa -noout -modulus -in private.key | openssl md5 ; \

openssl req -noout -modulus -in request.csr | openssl md5) | uniq

```



___



##### Tool: [secure-delete](https://wiki.archlinux.org/index.php/Securely_wipe_disk)



###### Secure delete with shred



```bash

shred -vfuz -n 10 file

shred --verbose --random-source=/dev/urandom -n 1 /dev/sda

```



###### Secure delete with scrub



```bash

scrub -p dod /dev/sda

scrub -p dod -r file

```



###### Secure delete with badblocks



```bash

badblocks -s -w -t random -v /dev/sda

badblocks -c 10240 -s -w -t random -v /dev/sda

```



###### Secure delete with secure-delete



```bash

srm -vz /tmp/file

sfill -vz /local

sdmem -v

swapoff /dev/sda5 && sswap -vz /dev/sda5

```



___



##### Tool: [dd](https://en.wikipedia.org/wiki/Dd_(Unix))



###### Show dd status every so often



```bash

dd  status=progress

watch --interval 5 killall -USR1 dd

```



###### Redirect output to a file with dd



```bash

echo "string" | dd of=filename

```



___



##### Tool: [gpg](https://www.gnupg.org/)



###### Export public key



```bash

gpg --export --armor "" > username.pkey

```



  * `--export` - export all keys from all keyrings or specific key

  * `-a|--armor` - create ASCII armored output



###### Encrypt file



```bash

gpg -e -r "" dump.sql

```



  * `-e|--encrypt` - encrypt data

  * `-r|--recipient` - encrypt for specific 



###### Decrypt file



```bash

gpg -o dump.sql -d dump.sql.gpg

```



  * `-o|--output` - use as output file

  * `-d|--decrypt` - decrypt data (default)



###### Search recipient



```bash

gpg --keyserver hkp://keyserver.ubuntu.com --search-keys ""

```



  * `--keyserver` - set specific key server

  * `--search-keys` - search for keys on a key server



###### List all of the packets in an encrypted file



```bash

gpg --batch --list-packets archive.gpg

gpg2 --batch --list-packets archive.gpg

```



___



##### Tool: [system-other](https://github.com/trimstray/the-book-of-secret-knowledge#tool-system-other)



###### Reboot system from init



```bash

exec /sbin/init 6

```



###### Init system from single user mode



```bash

exec /sbin/init

```



###### Show current working directory of a process



```bash

readlink -f /proc//cwd

```



###### Show actual pathname of the executed command



```bash

readlink -f /proc//exe

```



##### Tool: [curl](https://curl.haxx.se)



```bash

curl -Iks https://www.google.com

```



  * `-I` - show response headers only

  * `-k` - insecure connection when using ssl

  * `-s` - silent mode (not display body)



```bash

curl -Iks --location -X GET -A "x-agent" https://www.google.com

```



  * `--location` - follow redirects

  * `-X` - set method

  * `-A` - set user-agent



```bash

curl -Iks --location -X GET -A "x-agent" --proxy http://127.0.0.1:16379 https://www.google.com

```



  * `--proxy [socks5://|http://]` - set proxy server



```bash

curl -o file.pdf -C - https://example.com/Aiju2goo0Ja2.pdf

```



  * `-o` - write output to file

  * `-C` - resume the transfer



###### Find your external IP address (external services)



```bash

curl ipinfo.io

curl ipinfo.io/ip

curl icanhazip.com

curl ifconfig.me/ip ; echo

```



###### Repeat URL request



```bash

# URL sequence substitution with a dummy query string:

curl -ks https://example.com/?[1-20]



# With shell 'for' loop:

for i in {1..20} ; do curl -ks https://example.com/ ; done

```



###### Check DNS and HTTP trace with headers for specific domains



```bash

### Set domains and external dns servers.

_domain_list=(google.com) ; _dns_list=("8.8.8.8" "1.1.1.1")



for _domain in "${_domain_list[@]}" ; do



  printf '=%.0s' {1..48}



  echo



  printf "[\\e[1;32m+\\e[m] resolve: %s\\n" "$_domain"



  for _dns in "${_dns_list[@]}" ; do



    # Resolve domain.

    host "${_domain}" "${_dns}"



    echo



  done



  for _proto in http https ; do



    printf "[\\e[1;32m+\\e[m] trace + headers: %s://%s\\n" "$_proto" "$_domain"



    # Get trace and http headers.

    curl -Iks -A "x-agent" --location "${_proto}://${_domain}"



    echo



  done



done



unset _domain_list _dns_list

```



___



##### Tool: [httpie](https://httpie.org/)



```bash

http -p Hh https://www.google.com

```



  * `-p` - print request and response headers

    * `H` - request headers

    * `B` - request body

    * `h` - response headers

    * `b` - response body



```bash

http -p Hh https://www.google.com --follow --verify no

```



  * `-F, --follow` - follow redirects

  * `--verify no` - skip SSL verification



```bash

http -p Hh https://www.google.com --follow --verify no \

--proxy http:http://127.0.0.1:16379

```



  * `--proxy [http:]` - set proxy server



##### Tool: [ssh](https://www.openssh.com/)



###### Escape Sequence



```

# Supported escape sequences:

~.  - terminate connection (and any multiplexed sessions)

~B  - send a BREAK to the remote system

~C  - open a command line

~R  - Request rekey (SSH protocol 2 only)

~^Z - suspend ssh

~#  - list forwarded connections

~&  - background ssh (when waiting for connections to terminate)

~?  - this message

~~  - send the escape character by typing it twice

```



###### Compare a remote file with a local file



```bash

ssh user@host cat /path/to/remotefile | diff /path/to/localfile -

```



###### SSH connection through host in the middle



```bash

ssh -t reachable_host ssh unreachable_host

```



###### Run command over SSH on remote host



```bash

cat > cmd.txt << __EOF__

cat /etc/hosts

__EOF__



ssh host -l user $(&1 | tee -a "${_sesdir}/$(date +%Y%m%d).log"



}



# Alias:

alias ssh='_ssh_sesslog'

```



###### Using Keychain for SSH logins



```bash

### Delete all of ssh-agent's keys.

function _scl() {



  /usr/bin/keychain --clear



}



### Add key to keychain.

function _scg() {



  /usr/bin/keychain /path/to/private-key

  source "$HOME/.keychain/$HOSTNAME-sh"



}

```



###### SSH login without processing any login scripts



```bash

ssh -tt user@host bash

```



###### SSH local port forwarding



Example 1:



```bash

# Forwarding our local 2250 port to nmap.org:443 from localhost through localhost

host1> ssh -L 2250:nmap.org:443 localhost



# Connect to the service:

host1> curl -Iks --location -X GET https://localhost:2250

```



Example 2:



```bash

# Forwarding our local 9051 port to db.d.x:5432 from localhost through node.d.y

host1> ssh -nNT -L 9051:db.d.x:5432 node.d.y



# Connect to the service:

host1> psql -U db_user -d db_dev -p 9051 -h localhost

```



  * `-n` - redirects stdin from `/dev/null`

  * `-N` - do not execute a remote command

  * `-T` - disable pseudo-terminal allocation



###### SSH remote port forwarding



```bash

# Forwarding our local 9051 port to db.d.x:5432 from host2 through node.d.y

host1> ssh -nNT -R 9051:db.d.x:5432 node.d.y



# Connect to the service:

host2> psql -U postgres -d postgres -p 8000 -h localhost

```



___



##### Tool: [linux-dev](https://www.tldp.org/LDP/abs/html/devref1.html)



###### Testing remote connection to port



```bash

timeout 1 bash -c "//" >/dev/null 2>&1 ; echo $?

```



  * `` - set remote host

  * `` - set destination port



###### Read and write to TCP or UDP sockets with common bash tools



```bash

exec 5<>/dev/tcp//; cat <&5 & cat >&5; exec 5>&-

```



___



##### Tool: [tcpdump](http://www.tcpdump.org/)



###### Filter incoming (on interface) traffic (specific )



```bash

tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443

```



  * `-n` - don't convert addresses (`-nn` will not resolve hostnames or ports)

  * `-e` - print the link-level headers

  * `-i [iface|any]` - set interface

  * `-Q|-D [in|out|inout]` - choose send/receive direction (`-D` - for old tcpdump versions)

  * `host [ip|hostname]` - set host, also `[host not]`

  * `[and|or]` - set logic

  * `port [1-65535]` - set port number, also `[port not]`



###### Filter incoming (on interface) traffic (specific ) and write to a file



```bash

tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443 -c 5 -w tcpdump.pcap

```



  * `-c [num]` - capture only num number of packets

  * `-w [filename]` - write packets to file, `-r [filename]` - reading from file



###### Capture all ICMP packets



```bash

tcpdump -nei eth0 icmp

```



###### Check protocol used (TCP or UDP) for service



```bash

tcpdump -nei eth0 tcp port 22 -vv -X | egrep "TCP|UDP"

```



###### Display ASCII text (to parse the output using grep or other)



```bash

tcpdump -i eth0 -A -s0 port 443

```



###### Grab everything between two keywords



```bash

tcpdump -i eth0 port 80 -X | sed -n -e '/username/,/=ldap/ p'

```



###### Grab user and pass ever plain http



```bash

tcpdump -i eth0  port http -l -A | egrep -i \

'pass=|pwd=|log=|login=|user=|username=|pw=|passw=|passwd=|password=|pass:|user:|username:|password:|login:|pass |user ' \

--color=auto --line-buffered -B20

```



###### Extract HTTP User Agent from HTTP request header



```bash

tcpdump -ei eth0 -nn -A -s1500 -l | grep "User-Agent:"

```



###### Capture only HTTP GET and POST packets



```bash

tcpdump -ei eth0 -s 0 -A -vv \

'tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x47455420' or 'tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354'

```



or simply:



```bash

tcpdump -ei eth0 -s 0 -v -n -l | egrep -i "POST /|GET /|Host:"

```



###### Rotate capture files



```bash

tcpdump -ei eth0 -w /tmp/capture-%H.pcap -G 3600 -C 200

```



  * `-G ` - pcap will be created every `` seconds

  * `-C ` - close the current pcap and open a new one if is larger than ``



###### Top hosts by packets



```bash

tcpdump -ei enp0s25 -nnn -t -c 200 | cut -f 1,2,3,4 -d '.' | sort | uniq -c | sort -nr | head -n 20

```



###### Excludes any RFC 1918 private address



```bash

tcpdump -nei eth0 'not (src net (10 or 172.16/12 or 192.168/16) and dst net (10 or 172.16/12 or 192.168/16))'

```



___



##### Tool: [tcpick](http://tcpick.sourceforge.net/)



###### Analyse packets in real-time



```bash

while true ; do tcpick -a -C -r dump.pcap ; sleep 2 ; clear ; done

```



___



##### Tool: [ngrep](http://ngrep.sourceforge.net/usage.html)



```bash

ngrep -d eth0 "www.domain.com" port 443

```



  * `-d [iface|any]` - set interface

  * `[domain]` - set hostname

  * `port [1-65535]` - set port number



```bash

ngrep -d eth0 "www.domain.com" src host 10.240.20.2 and port 443

```



  * `(host [ip|hostname])` - filter by ip or hostname

  * `(port [1-65535])` - filter by port number



```bash

ngrep -d eth0 -qt -O ngrep.pcap "www.domain.com" port 443

```



  * `-q` - quiet mode (only payloads)

  * `-t` - added timestamps

  * `-O [filename]` - save output to file, `-I [filename]` - reading from file



```bash

ngrep -d eth0 -qt 'HTTP' 'tcp'

```



  * `HTTP` - show http headers

  * `tcp|udp` - set protocol

  * `[src|dst] host [ip|hostname]` - set direction for specific node



```bash

ngrep -l -q -d eth0 -i "User-Agent: curl*"

```



  * `-l` - stdout line buffered

  * `-i` - case-insensitive search



___



##### Tool: [hping3](http://www.hping.org/)



```bash

hping3 -V -p 80 -s 5050  www.google.com

```



  * `-V|--verbose` - verbose mode

  * `-p|--destport` - set destination port

  * `-s|--baseport` - set source port

  * `` - set scan type

    * `-F|--fin` - set FIN flag, port open if no reply

    * `-S|--syn` - set SYN flag

    * `-P|--push` - set PUSH flag

    * `-A|--ack` - set ACK flag (use when ping is blocked, RST response back if the port is open)

    * `-U|--urg` - set URG flag

    * `-Y|--ymas` - set Y unused flag (0x80 - nullscan), port open if no reply

    * `-M 0 -UPF` - set TCP sequence number and scan type (URG+PUSH+FIN), port open if no reply



```bash

hping3 -V -c 1 -1 -C 8 www.google.com

```



  * `-c [num]` - packet count

  * `-1` - set ICMP mode

  * `-C|--icmptype [icmp-num]` - set icmp type (default icmp-echo = 8)



```bash

hping3 -V -c 1000000 -d 120 -S -w 64 -p 80 --flood --rand-source 

```



  * `--flood` - sent packets as fast as possible (don't show replies)

  * `--rand-source` - random source address mode

  * `-d --data` - data size

  * `-w|--win` - winsize (default 64)



___



##### Tool: [nmap](https://nmap.org/)



###### Ping scans the network



```bash

nmap -sP 192.168.0.0/24

```



###### Show only open ports



```bash

nmap -F --open 192.168.0.0/24

```



###### Full TCP port scan using with service version detection



```bash

nmap -p 1-65535 -sV -sS -T4 192.168.0.0/24

```



###### Nmap scan and pass output to Nikto



```bash

nmap -p80,443 192.168.0.0/24 -oG - | nikto.pl -h -

```



###### Recon specific ip:service with Nmap NSE scripts stack



```bash

# Set variables:

_hosts="192.168.250.10"

_ports="80,443"



# Set Nmap NSE scripts stack:

_nmap_nse_scripts="+dns-brute,\

                   +http-auth-finder,\

                   +http-chrono,\

                   +http-cookie-flags,\

                   +http-cors,\

                   +http-cross-domain-policy,\

                   +http-csrf,\

                   +http-dombased-xss,\

                   +http-enum,\

                   +http-errors,\

                   +http-git,\

                   +http-grep,\

                   +http-internal-ip-disclosure,\

                   +http-jsonp-detection,\

                   +http-malware-host,\

                   +http-methods,\

                   +http-passwd,\

                   +http-phpself-xss,\

                   +http-php-version,\

                   +http-robots.txt,\

                   +http-sitemap-generator,\

                   +http-shellshock,\

                   +http-stored-xss,\

                   +http-title,\

                   +http-unsafe-output-escaping,\

                   +http-useragent-tester,\

                   +http-vhosts,\

                   +http-waf-detect,\

                   +http-waf-fingerprint,\

                   +http-xssed,\

                   +traceroute-geolocation.nse,\

                   +ssl-enum-ciphers,\

                   +whois-domain,\

                   +whois-ip"



# Set Nmap NSE script params:

_nmap_nse_scripts_args="dns-brute.domain=${_hosts},http-cross-domain-policy.domain-lookup=true,"

_nmap_nse_scripts_args+="http-waf-detect.aggro,http-waf-detect.detectBodyChanges,"

_nmap_nse_scripts_args+="http-waf-fingerprint.intensive=1"



# Perform scan:

nmap --script="$_nmap_nse_scripts" --script-args="$_nmap_nse_scripts_args" -p "$_ports" "$_hosts"

```



___



##### Tool: [netcat](http://netcat.sourceforge.net/)



```bash

nc -kl 5000

```



  * `-l` - listen for an incoming connection

  * `-k` - listening after client has disconnected

  * `>filename.out` - save receive data to file (optional)



```bash

nc 192.168.0.1 5051 < filename.in

```



  * `< filename.in` - send data to remote host



```bash

nc -vz 10.240.30.3 5000

```



  * `-v` - verbose output

  * `-z` - scan for listening daemons



```bash

nc -vzu 10.240.30.3 1-65535

```



  * `-u` - scan only udp ports



###### Transfer data file (archive)



```bash

server> nc -l 5000 | tar xzvfp -

client> tar czvfp - /path/to/dir | nc 10.240.30.3 5000

```



###### Launch remote shell



```bash

# 1)

server> nc -l 5000 -e /bin/bash

client> nc 10.240.30.3 5000



# 2)

server> rm -f /tmp/f; mkfifo /tmp/f

server> cat /tmp/f | /bin/bash -i 2>&1 | nc -l 127.0.0.1 5000 > /tmp/f

client> nc 10.240.30.3 5000

```



###### Simple file server



```bash

while true ; do nc -l 5000 | tar -xvf - ; done

```



###### Simple minimal HTTP Server



```bash

while true ; do nc -l -p 1500 -c 'echo -e "HTTP/1.1 200 OK\n\n $(date)"' ; done

```



###### Simple HTTP Server



  > Restarts web server after each request - remove `while` condition for only single connection.



```bash

cat > index.html << __EOF__



    

        

        

        

        

        

    

    



    



      Hello! It's a site.